CN115596803A - Vibration absorption and energy consumption combined type broadband vibration damper suitable for force bearing frame of aircraft engine - Google Patents

Abstract

The invention discloses a vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aeroengine, which comprises a support frame, dry friction shrapnel, a metal rubber damping layer, and tightening bolts. The vibration-absorbing quality of the dry friction shrapnel transfers the vibration energy of a specific frequency band of the load-bearing frame of the aero-engine to the damping shrapnel. The outer side of the dry friction shrapnel is in contact with the inner wall of the load-bearing frame casing to form a non-linear frictional energy dissipation interface to realize the dissipation of the transferred vibration energy; at the same time, the inner side of the dry friction shrapnel cooperates with the metal rubber damping layer, and the dry friction shrapnel can The metal rubber produces an extrusion effect, and the helical coils in the metal rubber damping layer are in contact with friction, resulting in hysteretic damping and energy consumption. By adjusting the pre-tightening force of the tightened bolts, the rigidity of the metal rubber can be realized, and then the vibration-absorbing frequency can be adjusted. It has the advantages of simple structure, light weight, stable vibration reduction effect, effective frequency bandwidth, strong adaptability to working load, etc., and has broad application prospects in the field of aircraft vibration control.

Description

Vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine

technical field

The invention relates to the field of aircraft vibration control, in particular to a vibration-absorbing and energy-consuming combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine.

Background technique

The damage, deformation or failure of the bearing structure of the aviation gas turbine engine (hereinafter referred to as the aviation gas turbine) has a great impact on the reliable operation of the engine, and the overrun of the vibration response is the main cause of the fatigue failure of the bearing structure. The input, transmission and dissipation of vibration energy It is the key to affect the vibration response of the structural system. When the excitation energy input cannot be reduced, the transfer and dissipation of vibration energy is an effective way to control vibration and is also an important development direction in the future. How to design a damping structure that efficiently transfers and dissipates multi-frequency/broadband vibration energy without changing the structural stiffness and small additional mass, so as to maximize the dynamic response control requires the development of corresponding design methods and technologies.

Dynamic vibration absorbing device is an effective way to control vibration, and it is also an important development direction in the future. Frahm ^[1] proposed the linear dynamic vibration absorber for the first time in 1902. When the frequency of the external excitation force of the main structure system is equal to the resonance frequency of the vibration absorber, the vibration absorber can transfer the vibration energy of the main structure system, but the early linear dynamic vibration absorber The vibration suppression frequency band is often narrow, which is difficult to meet the needs of broadband vibration absorption. In order to broaden the vibration absorption frequency band of the dynamic vibration absorption device, Arnold ^[2] proposed the concept of nonlinear dynamic vibration absorption in 1955. By considering the ideal case of an undamped cubic nonlinear spring, it was confirmed that nonlinear characteristics can broaden the vibration suppression frequency band of dynamic vibration absorption. Natsiavas ^[3] used the average method to study the stability of nonlinear DVA, and pointed out that reasonable selection of parameters of the dynamic vibration absorbing device can avoid instability and obtain good vibration suppression effect. A lot of subsequent research work is to obtain the parameter interval with good vibration suppression effect. Zhang Jian et al ^[4] proposed a shrapnel-type nonlinear vibration-absorbing-energy-dissipating structure for aviation gas turbines based on the structure and vibration characteristics of the bearing frame of the aviation gas turbine, using the dynamic vibration absorption of the shrapnel and the dry friction of the contact surface with the supporting structure Hysteretic energy consumption effectively reduces the broadband vibration response of the load-bearing frame. Wang Yongfeng et al. ^[5] proposed a multi-friction contact surface shrapnel-type nonlinear vibration-absorbing-energy-dissipating device for momentum wheels, adding multiple contact surfaces that can produce nonlinear dry friction hysteresis energy consumption, and further improving vibration energy consumption. scattered effect.

Metallic rubber is an elastic and porous material, which has the advantages of high damping, low density, and strong environmental adaptability. It is often used as a material for aerospace damping pads. Hong Jie ^[6] proposed an elastic ring damper with metal rubber layer, which can effectively replace the traditional oil film damper on aviation gas turbines. The team of Beihang University ^[7] applied the squirrel cage-metal rubber damper to the rotor of the hydrogen turbopump, and the test proved that the vibration of the rotor system near the critical speed was reduced by 90% compared with that without the damper. The team of the University of Chinese Academy of Sciences ^[8] took the flywheel of the "Jilin-1 high-resolution star" as the research object, designed a metal rubber vibration isolator according to the resonance frequency, and achieved a vibration isolation efficiency of 80% at the resonance point. With its excellent damping performance, metal rubber can be used as a damping element of a nonlinear dynamic vibration absorbing device.

The current nonlinear vibration-absorbing-energy-dissipating device has the following limitations: (1) The device only generates dry friction through the friction contact interface for hysteresis energy consumption. When the dry friction shrapnel resonates, it will produce contact behavior such as contact-separation, which cannot Stable hysteresis energy dissipation effect; (2) Its nonlinearity mainly comes from the frictional contact interface of the shrapnel, which has limited ability to broaden the effective frequency band of vibration reduction, and it is difficult to meet the needs of broadband vibration reduction;

Therefore, it is necessary to design a broadband vibration-absorbing-energy-dissipating vibration reduction device that can combine metal rubber and friction shrapnel. By increasing the metal rubber design that is in contact with the shrapnel, the energy dissipation path of the shrapnel is increased, and the vibration reduction effect is more stable. ; and the introduction of metal rubber with adjustable stiffness increases the nonlinearity of the vibration damping device, and realizes the widening and adjustment of the vibration-absorbing frequency range of the nonlinear vibration-absorbing energy-dissipating device, and has the adaptability to various working conditions.

Contents of the invention

The object of the present invention is to provide a vibration-absorbing and energy-consuming combined broadband vibration-damping device for the load-bearing frame of an aero-engine to solve the problems in the prior art above, and to realize the aerodynamic The efficient transfer-dissipation of the vibration energy of the engine load-bearing frame reduces the vibration response level of the aero-engine to prevent its structural damage. Among them, the energy transfer is to use the principle of dynamic vibration absorption to transfer the vibration energy of the aero-engine load-bearing frame to the vibration-absorbing mass of the shrapnel; the energy dissipation is to use the dry friction hysteresis energy dissipation theory and the metal rubber damping energy dissipation theory to realize the vibration energy from Efficient dissipation in the process of transmitting the load-bearing frame of the aero-engine to the shock-absorbing shrapnel.

In order to achieve the above object, the present invention provides the following scheme: the present invention provides a vibration-absorbing and energy-consuming combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine, and the vibration-absorbing-energy-consuming combined broadband vibration-damping device is installed in the aviation It is installed on the flange of the load-bearing frame of the engine to absorb and dissipate the vibration energy of the load-bearing frame of the aero-engine, reduce its vibration response, and avoid cracks or failures of the load-bearing frame of the aero-engine due to vibration, including the support frame , the support frame is provided with several vibration-absorbing-energy-dissipating combined broadband vibration-damping structures, the vibration-absorbing-energy-dissipating combined broadband vibration-damping structures include dry friction shrapnel, and the dry friction shrapnel is connected with a metal rubber structure, The metal rubber structure is arranged on the support frame;

The dry friction shrapnel is a nonlinear structure, and the metal rubber structure includes a metal rubber damping layer and a metal rubber bracket, the metal rubber damping layer is embedded in the metal rubber bracket, and the metal rubber bracket is installed on the metal rubber bracket. on the support frame, and the dry friction shrapnel is adapted to the metal rubber damping layer, and the pretightening force is adjusted between the metal rubber damping layer and the metal rubber bracket through the second tightening member. By adjusting the first 2. The pretightening force of the tightening part causes the metal rubber damping layer to expand or contract, so that the arc surface of the metal rubber damping layer and the non-linear bottom surface of the dry friction shrapnel generate a pretightening force, and form a second Non-linear friction contact surface; the support frame is designed as an expanding ring, and the two ends of the support frame are connected by a first tightening member. By adjusting the pre-tightening force of the first tightening member, the dry friction The non-linear top surface of the shrapnel and the inner wall of the casing of the load-bearing frame generate a pre-tightening force and form the first non-linear friction contact surface;

When designing the resonance frequency of the dry friction shrapnel, it is jointly determined by the stiffness and mass of the dry friction shrapnel.

Preferably, the dry friction shrapnel includes a first arc surface and a vibration-absorbing mass, the first arc surface and the vibration-absorbing mass are integrally formed, the first arc surface is in fitting contact with the metal rubber damping layer, By adjusting the pre-tightening force of the second tightening member, the top of the first arc surface is in contact with the arc surface of the metal rubber damping layer to form a second non-linear frictional contact surface, and the vibration-absorbing mass is located on the In the metal rubber bracket, the main dimensions of the first arc surface and the vibration-absorbing mass are determined by the main vibration frequency of the load-bearing frame of the aero-engine.

Preferably, the dry friction shrapnel has a contact-separation contact form; when the top of the first arc surface is in contact with the inner wall of the load-bearing frame case, the first nonlinear friction contact surface and the second The two non-linear frictional contact surfaces produce dry friction hysteresis energy consumption; when the top of the first arc surface is separated from the inner wall of the load-bearing frame case, the inner helical coil of the metal rubber damping layer contacts and frictions to generate high-efficiency hysteresis Damping energy consumption.

Preferably, there are at least 15 combined vibration-absorbing-energy-dissipating broadband vibration-damping structures.

Preferably, the metal rubber damping layer realizes the optimal design of the metal wire dry friction hysteresis energy dissipation characteristics in the metal rubber damping layer by adjusting the relative density, and at the same time affects the constraint stiffness of the dry friction shrapnel, and adjusts the Resonant frequency of dry friction shrapnel.

Preferably, the metal rubber damper includes a second arc surface, the first arc surface and the second arc surface are correspondingly arranged and matched, and the second arc surface is in contact with the first arc surface to form a second arc surface. Two non-linear frictional contact surfaces.

Preferably, when used as a damper, the first nonlinear friction contact surface and the second nonlinear friction contact surface generate dry friction hysteresis energy consumption to achieve efficient dissipation of vibration energy; when used as a vibration absorber, The main vibration-absorbing mechanism is the dry friction shrapnel. For the complex frequency response components of the aero-engine, by setting several vibration-absorbing-energy-dissipating combined broadband vibration-damping devices, the stiffness is adjusted for different frequencies to realize nonlinear vibration-absorbing consumption. It can broaden and adjust the vibration-absorbing frequency range of the energy device, and has the adaptability to various working conditions.

The present invention discloses the following technical effects: the advantages of the vibration-absorbing-energy-consuming combined broadband vibration damping device disclosed in the present invention are:

(1) The device of the present invention is simple in structure and light in weight, without changing the structural form and rigidity and quality characteristics of the load-bearing frame of the aero-engine, only adding the vibration-absorbing-energy-dissipating combined broadband of the present invention to the original load-bearing frame of the aero-engine The damping device only needs to adjust parameters such as the device structure of the present invention to efficiently damp the load of the aero-engine load-bearing frame under different load characteristics.

(2) The device of the present invention considers that the local friction contact interface of the dry friction shrapnel has contact-separation contact behaviors, and its dry friction damping energy consumption effect is poor and the stability of the energy consumption effect is not good during operation, so a metal with high damping is introduced. The rubber damping layer can realize the efficient and stable transfer and dissipation of vibration energy to the designed nonlinear vibration-absorbing structure.

(3) The device of the present invention has multiple local frictional contact surfaces and metal rubber. As the load changes, its stiffness and damping characteristics will produce nonlinear changes. Using the above nonlinear characteristics, it can realize efficient dissipation of vibration energy in a wider frequency band .

(4) In the device of the present invention, the stiffness of the dry friction shrapnel is jointly affected by the geometric dimensions of the arc-shaped surface of the dry friction shrapnel, the relative density of the metal rubber damping layer, the pre-tightening force of the first tightening part and the pre-tightening force of the second tightening part , in view of the complex frequency response components of the aero-engine, multiple vibration-absorbing-energy-dissipating combined broadband vibration-damping structures can be arranged in the circumferential direction, and the stiffness can be adjusted for different frequencies to realize the adjustment of the vibration-absorbing frequency range of the nonlinear vibration-absorbing and energy-consuming device. Adaptability to various working conditions.

(5) In the device of the present invention, when the load-bearing frame of the aero-engine vibrates in the axial direction (horizontal direction) or torsional direction, high-efficiency dry friction hysteresis energy consumption can be realized at the first and second nonlinear friction contact surfaces b ; When the load-bearing frame of the aero-engine vibrates in the radial direction (vertical direction), the dry friction shrapnel resonates. In addition to realizing the high-efficiency dry friction hysteresis energy dissipation effect on the first and second nonlinear friction contact surfaces, it can also be used on the metal rubber The contact friction of the helical coils in the damping layer produces hysteretic damping energy dissipation. That is to say, the dry friction shrapnel-metal rubber nonlinear vibration-absorbing-energy-dissipating device has good vibration damping performance after vibration in all directions of the load-bearing frame, and has strong load adaptability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Figure 1 is a schematic diagram of the installation of a vibration-absorbing-energy-dissipating combined broadband vibration-damping device on a load-bearing frame;

Figure 2 is a structural schematic diagram of a vibration-absorbing-energy-dissipating combined broadband vibration-damping device;

Fig. 3 is the structural representation of support frame;

Fig. 4 is a schematic structural view of a dry friction shrapnel;

Fig. 5 is the structural representation of metal rubber damping layer;

Fig. 6 is the structural representation of metal rubber bracket;

Fig. 7 is a schematic diagram of the frictional contact interface in the vibration-absorbing-energy-dissipating combined broadband vibration-damping device;

Fig. 8 is a schematic diagram of a vibration-absorbing-energy-dissipating combined broadband vibration-damping structure;

Fig. 9 is a scanning electron microscope enlarged view of the metal rubber damping layer;

Figure 10 is a comparison diagram of the response of the load-bearing frame after installing different damping devices;

Among them, A-load-bearing frame; B-vibration absorption-energy dissipation combined broadband vibration damping device;

1-support frame; 2-first mounting bolt; 3-dry friction shrapnel; 4-metal rubber damping layer; 5-metal rubber bracket; 6-second mounting bolt; 7-first tightening bolt; 8-second tightening Bolt; 9.-Flange mounting edge of load-bearing frame; 10-Inner wall of load-bearing frame casing;

1a-the first mounting bolt hole; 1b-the second mounting bolt hole; 1c-the first tightening bolt hole;

3a-the first installation plane; 3b-the first arc surface; 3c-vibration-absorbing mass; 3d-the third installation bolt hole;

4a-the second arc surface; 4b-the first preload adjustment surface; 4c. the second tightening bolt hole;

5a-the second installation plane; 5b-metal rubber installation groove; 5c-the second preload adjustment surface; 5d-the third tightening bolt hole; 5e-the fourth installation bolt hole;

a - the first nonlinear frictional contact surface; b - the second nonlinear frictional contact surface.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1-10, the present invention provides a vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine. On the installation side 9, it is used to absorb and dissipate the vibration energy of the load-bearing frame A of the aero-engine, reduce its vibration response, and avoid the crack problem or failure of the load-bearing frame A of the aero-engine due to vibration, including the support frame 1 and the support frame 1 is provided with several vibration-absorbing-energy-dissipating combined broadband damping structures, the vibration-absorbing-energy-dissipating combined broadband damping structure includes dry friction shrapnel 3, and the dry friction shrapnel 3 is contacted and connected with a metal rubber structure, which is set on the support rack 1;

The dry friction shrapnel 3 is a nonlinear structure, the metal rubber structure includes a metal rubber damping layer 4 and a metal rubber bracket 5, the metal rubber damping layer 4 is embedded in the metal rubber bracket 5, and the metal rubber bracket 5 is installed on the support frame 1, and The dry friction shrapnel 3 is adapted to the metal rubber damping layer 4, and the pretightening force is adjusted between the metal rubber damping layer 4 and the metal rubber bracket 5 through the second tightening part. By adjusting the pretightening force of the second tightening part, the metal rubber The damping layer 4 expands or contracts, so that the arc surface of the metal rubber damping layer 4 and the non-linear bottom surface of the dry friction shrapnel 3 generate a pre-tightening force, and form the second non-linear friction contact surface b; the support frame 1 is an expanding ring type Design, the two ends of the support frame 1 are connected by the first tightening member, and by adjusting the pre-tightening force of the first tightening member, the non-linear top surface of the dry friction shrapnel 3 and the inner wall 10 of the load-bearing frame case generate a pre-tightening force , and form the first nonlinear friction contact surface a;

When designing the resonance frequency of the dry friction shrapnel 3, it is jointly determined by the stiffness and mass of the dry friction shrapnel 3.

As shown in Figures 1, 2 and 8, specifically, a number of connecting frames (not marked in the figure) are fixedly connected to one side of the supporting frame 1, and several connecting pieces are evenly arranged along the circumference of the supporting frame 1. A mounting bolt 2 fixes the connecting frame on the flange mounting edge 9 of the load-bearing frame to form the main body of the dry friction shrapnel 3-metal rubber nonlinear vibration absorption-energy dissipation device, and at the same time, the supporting frame 1 is sequentially connected by the second mounting bolt 6 , the metal rubber bracket 5 and the dry friction shrapnel 3 are fixedly connected into one body, wherein the first tightening member and the second tightening member are respectively the first tightening bolt 7 and the second tightening bolt 8; When the frame A vibrates in the axial (horizontal) or torsional direction, efficient dry friction hysteresis energy dissipation can be achieved at the first nonlinear friction contact surface a and the second nonlinear friction contact surface b; When the force frame A vibrates in the radial direction (vertical direction), the dry friction shrapnel 3 resonates. In addition to realizing efficient dry friction hysteresis energy dissipation on the first nonlinear friction contact surface a and the second nonlinear friction contact surface b, it also Hysteretic damping energy dissipation can be generated by the helical coil contact friction in the metal rubber. That is to say, the dry friction shrapnel 3-metal rubber nonlinear vibration-absorbing-energy-dissipating device has good vibration-damping performance after vibration in all directions of the load-bearing frame A, and has strong load adaptability.

As shown in Figure 3, in one embodiment of the present invention, a first mounting bolt hole 1a is provided on each connecting piece, and the first mounting bolt hole 1a is used to install the support frame 1 on the bearing through the first mounting bolt 2. On the mounting edge 9 of the flange of the force frame, the main body of the dry friction shrapnel 3-metal rubber nonlinear vibration-absorbing-energy-dissipating device is formed. Energy dissipation combined broadband vibration damping structure, and several second installation bolt hole groups are opened on the support frame 1, and a second installation bolt hole group includes at least two second installation bolt holes 1b, the second installation bolt holes The group is located on the side of the installation groove, and the side of the installation groove near the connection of the end of the support frame 1 does not contain the second installation bolt hole group. The second installation bolt hole 1b is used to connect the support frame 1, dry friction shrapnel 3, metal The rubber bracket 5 is fixed and connected as a whole to form the main working mechanism of the vibration-absorbing-energy-dissipating combined broadband vibration-damping device B; at least one first tightening bolt hole 1c is provided on the two ends of the connection of the support frame 1, And the positions of the two first tightening bolt holes 1c are set correspondingly, the first tightening bolts 7 respectively pass through the two first tightening bolt holes 1c to connect the support frame 1 into an integrated structure, and by adjusting the degree of tightness of the first tightening bolts 7, that is Adjusting the pre-tightening force of the first tightening bolt 7 can adjust the pressure between the dry friction shrapnel 3 and the inner wall 10 of the load-bearing frame casing to ensure that the first nonlinear friction contact surface a performs efficient dry friction hysteresis energy consumption, and at the same time adjusts the dry friction. Friction the constraint stiffness of the shrapnel 3 to adjust its resonant frequency.

To further optimize the scheme, the dry friction shrapnel 3 includes a first arc surface 3b and a vibration-absorbing mass 3c, the first arc surface 3b and the vibration-absorbing mass 3c are integrally formed, and the first arc surface 3b is in contact with the metal rubber damping layer 4. By adjusting The pre-tightening force of the second tightening member makes the top of the first arc surface 3b contact the arc surface of the metal rubber damping layer 4 to form the second nonlinear friction contact surface b, and the vibration-absorbing mass 3c is located in the metal rubber bracket 5, the first The main dimensions of the arc surface 3b and the vibration-absorbing mass 3c are determined by the main vibration frequency of the load-bearing frame A of the aeroengine.

As shown in Figure 4, in one embodiment of the present invention, the dry friction shrapnel 3 further includes a first installation plane 3a affixed to the first arc surface 3b, and at least two third installation planes are provided on the first installation plane 3a. Bolt hole 3d, in order to facilitate the installation of dry friction shrapnel 3, the position of the third mounting bolt hole 3d is set corresponding to the position of the second mounting bolt hole 1b. During installation, the second mounting bolt 6 passes through the second mounting bolt hole 1b in sequence and the third mounting bolt hole 3d, install the dry friction shrapnel 3 on the support frame 1, after the installation is completed, the dry friction shrapnel 3 is limited in the installation groove, and the arc surface of the first arc surface 3b contacts the flange mounting edge of the load-bearing frame 9, the right side of the first installation plane 3a is the first arc surface 3b; the vibration-absorbing mass 3c is located at the end of the first arc surface 3b, constituting the mass vibrator part of the dynamic vibration absorber; the shape and size of the first arc surface 3b are The main factors affecting the stiffness of the dry friction shrapnel 3, when the pre-tightening force of the first tightening bolt 7 is changed, the pressure on the first arc surface 3b and the inner wall 10 of the load-bearing frame casing will be changed, thereby making the first arc surface The shape and size of 3b and the inner wall 10 of the load-bearing frame casing change, which changes the stiffness of the dry friction shrapnel 3; the shape and size of the vibration-absorbing mass 3c are the main factors affecting the quality of the dry friction shrapnel 3, and the vibration-absorbing mass 3c The shape and size can be selected and set according to the actual vibration energy. According to the working principle of the dynamic vibration absorber, the working frequency of the dry friction shrapnel 3 should be designed near the main vibration frequency of the load-bearing frame A of the aero-engine, so as to realize the efficient transfer of vibration energy, that is, the first arc surface 3b and the vibration-absorbing mass 3c The main dimensions are determined by the main vibration frequency of the load-bearing frame A of the aero-engine.

Furthermore, the dry friction shrapnel 3 has a contact-separation contact form; when the top of the first arc surface 3b is in contact with the inner wall 10 of the load-bearing frame casing, the first nonlinear friction contact surface a and the second nonlinear friction contact Surface b produces dry friction hysteresis energy consumption; when the top of the first arc surface 3b is separated from the inner wall 10 of the load-bearing frame casing, the inner spiral coil of the metal rubber damping layer 4 contacts and frictions, resulting in efficient hysteresis damping energy consumption.

Furthermore, in order to make the vibration-absorbing-energy-dissipating combined broadband vibration-damping device B fully exert the performance of adjustable broadband, in practical applications, multiple vibration-absorbing-energy-dissipating combined broadband vibration-damping devices should be arranged in the circumferential direction of the support frame 1. Structure, in this embodiment, there are 15 vibration-absorbing-energy-dissipating combined broadband vibration-damping structures.

To further optimize the scheme, the metal rubber damping layer 4 realizes the optimal design of the metal wire dry friction hysteresis energy dissipation characteristics in the metal rubber damping layer 4 by adjusting the relative density, and at the same time affects the constraint stiffness of the dry friction shrapnel 3, and adjusts the dry friction shrapnel 3 the resonant frequency. The metal rubber damper includes a second arc surface 4a, the first arc surface 3b and the second arc surface 4a are correspondingly arranged and matched, and the second arc surface 4a is in contact with the first arc surface 3b to form a second non-linear frictional contact face b.

As shown in Figure 5, the metal rubber damping layer 4 also includes at least one first preload adjustment surface 4b, and a second tightening bolt hole 4c is opened on the first preload adjustment surface 4b, and the second tightening bolt hole 4c It is used to connect the metal rubber damping layer 4 with the metal rubber bracket 5 through the second tightening bolt 8; at the same time, by adjusting the pre-tightening force of the second tightening bolt 8, the second arc surface 4a and the dry first arc surface 3b form the first 2. Non-linear frictional contact surface b; the relative density of the metal rubber damping layer 4 is the main factor affecting its damping coefficient and stiffness. By adjusting the relative density, the optimum dry friction hysteresis energy dissipation characteristics of the metal wire in the metal rubber damping layer 4 can be realized. Optimize the design, affect the restraint stiffness of the dry friction shrapnel 3 at the same time, and adjust its resonance frequency.

As shown in Figure 6, the metal rubber bracket 5 includes a second installation plane 5a, a metal rubber installation groove 5b and a second preload adjustment surface 5c; the second installation plane 5a is provided with at least two fourth installation bolt holes 5e , wherein the second mounting bolt hole 1b, the third mounting bolt hole 3d and the fourth mounting bolt hole 5e are set correspondingly, during installation, the second mounting bolt 6 passes through the second mounting bolt hole 1b, the third mounting bolt hole 3d and the fourth mounting bolt hole 5 in sequence Four installation bolt holes 5e are used to install the metal rubber bracket 5 and the dry friction shrapnel 3 on the support frame 1, and the first installation plane 3a and the second installation plane 5a are respectively located on a side of the support frame 1 away from the inner wall 10 of the load-bearing frame case. Side; at least one third tightening bolt hole 5d is opened on the second pretightening force adjustment surface 5c, and the third tightening bolt hole 5d and the second tightening bolt hole 4c are set correspondingly; the metal rubber installation groove 5b is used to install the metal rubber Damping layer 4, and in order to facilitate the adjustment of the pressing force, a through groove is opened at the bottom of the metal rubber mounting groove 5b, and the metal rubber mounting groove 5b is divided into two parts, wherein the through groove is arranged in parallel with the second tightening bolt 8, and at the same time It is also possible to set up another through groove, which is arranged vertically with the through groove parallel to the second tightening bolt 8; the second tightening bolt 8 passes through the third tightening bolt hole 5d and the second tightening bolt hole 4c, and the pre-tightening force can be adjusted. Adjust the pressing force between the second pretightening force adjustment surface 5c and the second pretightening force adjustment surface 5c, and then adjust the expansion and contraction of the metal rubber damping layer 4, and change the second arc surface 4a and the second arc surface 4a of the metal rubber damping layer 4 The pressing force between the first arc surfaces 3b of the dry friction shrapnel 3 ensures efficient dry friction hysteresis energy consumption on the second non-linear friction contact surface b, and at the same time adjusts the restraint stiffness of the dry friction shrapnel 3 and adjusts its resonant frequency.

To further optimize the scheme, when used as a damper, the first nonlinear friction contact surface a and the second nonlinear friction contact surface b generate dry friction hysteresis energy consumption, and realize efficient dissipation of vibration energy; when used as a vibration absorber, the main The vibration-absorbing mechanism is a dry friction shrapnel 3. Aiming at the complex frequency response components of the aero-engine, by setting several vibration-absorbing-energy-consuming combined broadband vibration-damping devices B, the stiffness is adjusted for different frequencies to realize the vibration-absorbing effect of the nonlinear vibration-absorbing and energy-consuming device. The widening and adjustment of the frequency range has the ability to adapt to various working conditions.

As shown in FIG. 7 , specifically, the first arcuate surface 3 b forms a first nonlinear frictional contact surface a and a second nonlinear frictional contact surface b with the inner wall 10 of the bearing frame casing and the second arcuate surface 4 a respectively. When the load-bearing frame A of the aero-engine vibrates in the axial direction (horizontal direction) or the torsional direction, the inner wall 10 of the load-bearing frame casing and the dry friction shrapnel 3 produce relative displacement, and the first nonlinear friction contact surface a and the second nonlinear High-efficiency dry friction hysteresis energy consumption is realized at the friction contact surface b; when the load-bearing frame A of the aero-engine vibrates in the radial direction (vertical direction), the dry friction shrapnel 3 resonates, and the first arc surface 3b and the inner wall of the load-bearing frame casing 10 produces a relative displacement, and realizes the high-efficiency dry friction hysteresis energy dissipation effect on the first nonlinear friction contact surface a. In addition, the relative displacement of the first arc surface 3b and the second arc surface 4a is realized on the second nonlinear friction contact surface b Efficient dry friction hysteresis energy consumption, when the dry friction shrapnel 3 separates from the non-linear friction contact surface, it will squeeze the metal rubber damping layer 4 downwards to realize the dry friction damping energy consumption of the metal spiral wire inside the metal rubber. That is to say, the dry friction shrapnel 3-metal rubber nonlinear vibration-absorbing-energy-dissipating device has good vibration-damping performance after vibration in all directions of the load-bearing frame A, and has strong load adaptability.

In another embodiment of the present invention, as shown in Figure 9, the metal rubber layer is made of metal rubber, wherein the metal rubber is a functional metal material with a porous structure, which is made of metal spiral wire through special processes such as weaving and molding. Prepared, it can be classified as a fibrous porous material, and its internal organization is a three-dimensional network structure formed by interlinking, interlocking, and interlocking metal spiral coils of different shapes after stretching. There is a complex interaction between the helical coils. Under the external load, there will be three contact states of separation, slip and adhesion between the helical coils, resulting in a huge nonlinearity, and its energy dissipation capacity is far away. above the dry friction contact interface.

In another embodiment of the present invention, as shown in Figure 10, the figure respectively includes a vibration absorbing-energy dissipating device, a vibration absorbing-energy dissipating device with only friction shrapnel, and a vibration-absorbing-energy dissipating combined type of the present invention. Frequency sweep test of aero-engine load-bearing frame A of broadband vibration damping device B. After comparing the drawings, it can be concluded without doubt that the combined vibration-absorbing-energy-dissipating broadband vibration-damping device B of the present invention has a more stable vibration-damping effect, a wider effective frequency band and a stronger adaptability to working loads.

When the present invention is used as a damper, when the load-bearing frame A of the aero-engine vibrates in a non-vibration-absorbing direction, the first nonlinear friction contact surface a and the second nonlinear friction contact surface b produce dry friction hysteresis energy consumption, realizing the reduction of vibration energy Efficient dissipation; when used as a vibration absorber, the main vibration-absorbing mechanism is the dry friction shrapnel 3, and its resonance frequency is affected by both mass and stiffness. , the relative density of the metal rubber damping layer 4, the pre-tightening force of the first tightening bolt 7 and the pre-tightening force of the second tightening bolt 8 work together, aiming at the complex frequency response components of the aero-engine, multiple vibration-absorbing-loss The combined broadband vibration damping structure can adjust the stiffness according to different frequencies, realize the expansion and adjustment of the vibration absorption frequency range of the nonlinear vibration absorption and energy dissipation device, and have the adaptability to various working conditions.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The above embodiments only describe the preferred mode of the present invention, and do not limit the scope of the present invention. On the premise of not departing from the design spirit of the present invention, those skilled in the art may make various modifications and changes to the technical solution of the present invention. Improvements should all fall within the scope of protection determined by the claims of the present invention.

Claims (7)

1. A vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine. It is used to absorb and dissipate the vibration energy of the load-bearing frame (A) of the aero-engine, reduce its vibration response, and avoid cracks or failures of the load-bearing frame (A) of the aero-engine due to vibration. It is characterized in that it includes a support frame (1 ), the support frame (1) is provided with several vibration-absorbing-energy-dissipating combined broadband vibration-damping structures, the vibration-absorbing-energy-dissipating combined broadband vibration-damping structures include dry friction shrapnel (3), and the dry friction shrapnel (3) A metal-rubber structure is connected in contact, and the metal-rubber structure is arranged on the support frame (1); The dry friction shrapnel (3) is a nonlinear structure, and the metal rubber structure includes a metal rubber damping layer (4) and a metal rubber bracket (5), and the metal rubber damping layer (4) is embedded in the metal rubber In the bracket (5), the metal rubber bracket (5) is installed on the support frame (1), and the dry friction shrapnel (3) is matched with the metal rubber damping layer (4), and the The pretightening force between the metal rubber damping layer (4) and the metal rubber bracket (5) is adjusted through the second tightening member, and by adjusting the pretightening force of the second tightening member, the metal rubber damping layer (4 ) to expand or contract, so that the arc-shaped surface of the metal rubber damping layer (4) and the nonlinear bottom surface of the dry friction shrapnel (3) generate a pre-tightening force, and form a second nonlinear friction contact surface (b) ; The support frame (1) is designed as an expanding ring, the two ends of the support frame (1) are connected by the first tightening piece, and the stem can be adjusted by adjusting the preload of the first tightening piece The non-linear top surface of the friction shrapnel (3) and the inner wall of the casing (10) of the load-bearing frame generate a pre-tightening force and form the first non-linear friction contact surface (a); When designing the resonance frequency of the dry friction shrapnel (3), it is jointly determined by the stiffness and mass of the dry friction shrapnel (3). 2. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 1, characterized in that: the dry friction shrapnel (3) includes a first arc surface (3b) and a vibration-absorbing mass (3c), the first arc surface (3b) and the vibration-absorbing mass (3c) are integrally formed, and the first arc surface (3b) is fitted in contact with the metal rubber damping layer (4). Adjusting the pre-tightening force of the second tightening member, so that the top of the first arc surface (3b) is in contact with the arc surface of the metal rubber damping layer (4) to form a second non-linear friction contact surface (b) , the vibration-absorbing mass (3c) is located in the metal rubber bracket (5), the main dimensions of the first arc surface (3b) and the vibration-absorbing mass (3c) are determined by the main dimensions of the aero-engine load-bearing frame (A) The vibration frequency is determined. 3. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 2, characterized in that: the dry friction shrapnel (3) has a contact-separation contact form; when the When the top of the first arc surface (3b) is in contact with the inner wall (10) of the bearing frame casing, the first nonlinear friction contact surface (a) and the second nonlinear friction contact surface (b) are formed Dry friction hysteresis energy consumption; when the top of the first arc surface (3b) is separated from the inner wall (10) of the load-bearing frame case, the inner spiral coil of the metal rubber damping layer (4) contacts and rubs, resulting in Efficient hysteretic damping for energy dissipation. 4. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 1, wherein there are at least 15 vibration-absorbing-energy-dissipating combined broadband vibration-damping structures. 5. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 1, characterized in that: the metal-rubber damping layer (4) realizes the metal-rubber damping layer (4) by adjusting the relative density. The optimal design of the dry friction hysteresis energy dissipation characteristics of the metal wire in the damping layer (4) affects the restraint stiffness of the dry friction shrapnel (3) at the same time, and adjusts the resonance frequency of the dry friction shrapnel (3). 6. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 1, characterized in that: the metal rubber damper includes a second arc surface (4a), and the first arc The surface (3b) and the second arc surface (4a) are correspondingly arranged and matched, and the second arc surface (4a) is in contact with the first arc surface (3b) to form a second non-linear frictional contact surface (b ). 7. The vibration-absorbing and energy-dissipating combined broadband vibration-damping device suitable for the load-bearing frame of an aero-engine according to claim 1, characterized in that: when used as a damper, the first nonlinear frictional contact surface (a) and the second non-linear friction contact surface (b) to generate dry friction hysteresis energy consumption to realize efficient dissipation of vibration energy; when used as a vibration absorber, the main vibration absorption mechanism is the dry friction shrapnel (3), which is aimed at aero-engine For complex frequency response components, by setting several vibration-absorbing-energy-dissipating combined broadband vibration-damping devices (B), the stiffness is adjusted for different frequencies, so as to realize the expansion and adjustment of the vibration-absorbing frequency range of the nonlinear vibration-absorbing and energy-consuming device, Adaptability to various working conditions.

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