CN102589882A - Radial bearing static and dynamic excitation device consisting of spring and piezoelectric actuator - Google Patents

Abstract

A radial bearing static and dynamic vibration excitation device composed of a spring and a piezoelectric actuator is composed of a static load loading device, a dynamic load vibration device, a bearing lower tile body, a cylindrical support block and an afterburner tile. The static load loading device can apply static load to the test bearing, adjust the static load screw to compress the static load disc spring, and transmit the static load force to the afterburner tile through the cylindrical support block; the dynamic load excitation device can test the test bearing Dynamic excitation is applied, including sine wave excitation, step excitation, pulse excitation, random excitation, pseudo-random excitation, etc. The dynamic load screw can adjust the initial position of the piezoelectric brake, and the piezoelectric brake is under the action of the control signal Correspondingly deformed and compressed dynamic-load disc springs are generated, and the dynamic exciting force is transmitted to the afterburner tiles through the cylindrical support block. The radial bearing loading excitation device composed of spring and piezoelectric actuator can apply static load and dynamic excitation to the test bearing at the same time, overcoming the traditional bearing test bench that needs to use different devices to apply static load and dynamic excitation to the bearing respectively , can be used as a new type of bearing test bench test bearing loading and vibration device.

Description

Static and dynamic vibration excitation device for radial bearings composed of springs and piezoelectric actuators

Technical field:

The invention belongs to the technical field of sliding bearings, in particular to a static load and dynamic excitation applied to a bearing by a bearing test bench, and a so-called radial bearing static and dynamic vibration excitation device composed of a spring and a piezoelectric actuator.

Background technique:

The dynamic coefficient of stiffness and damping of sliding bearings is an important parameter to characterize the service performance of bearings. In the traditional bearing test, bellows are usually used to apply static load to the bearing to simulate the actual loading condition of the bearing when it is in service; a vibrator is used to apply dynamic excitation to the bearing to simulate the disturbance of the bearing under service operating conditions . In the traditional bearing test, different devices are used to apply static load and dynamic excitation to the test bearing. Many instruments and test conditions used in the test have occasional instability, and the installation of each device on the test bench will inevitably have errors; Due to the linear requirement of the oil film, the displacement perturbation excited by the vibrator is generally only about 10 μm, so the signal-to-noise ratio is unavoidably low for such a small signal, which makes it difficult to guarantee the test accuracy (Yuan Xiaoyang, master's degree thesis of Xi'an Jiaotong University, 1985 ). Therefore, a radial bearing static and dynamic vibration excitation device composed of a spring and a piezoelectric actuator that can simultaneously apply static load and dynamic excitation in the bearing test is used to simplify the structure of the bearing test bench and reduce the test equipment, and improve the bearing performance. The identification accuracy of the dynamic characteristic coefficient of stiffness and damping is an important development requirement for the identification test technology of the dynamic characteristic of sliding bearings.

Invention content:

The purpose of the present invention is to overcome the deficiency that the traditional bearing test bench needs to use different devices to apply static load and dynamic vibration to the bearing respectively, and propose a radial bearing static and dynamic vibration excitation device composed of a spring and a piezoelectric actuator.

The purpose of the present invention is achieved in that it consists of a static load loading device, a dynamic load vibration device, and a cylindrical support block. The vibration excitation device is installed inside the static load loading device; the cylindrical support block is located above the static load loading device and is in contact with the dynamic load vibration device; the cylindrical support block also passes through the bearing lower tile body of the radial bearing in the radial direction; the column The surface support block supports the afterburner pad in the radial bearing under the action of the static load loading device and the dynamic load excitation device.

The static load loading device can apply static load to the test bearing, adjust the static load screw to compress the static load disc spring, and transmit the static load force to the afterburner tile through the cylindrical support block; the dynamic load excitation device can test the test bearing Apply dynamic excitation, including sine wave excitation, step excitation, pulse excitation, random excitation, pseudo-random excitation, etc. The dynamic load screw can adjust the initial position of the piezoelectric actuator. Under the action of the control signal, corresponding deformation and compression of the dynamic load disc spring is generated, and the dynamic excitation force is transmitted to the afterburner tile through the cylindrical support block. This bearing loading excitation device can apply static load and dynamic excitation to the test bearing at the same time, so it is called a static and dynamic vibration excitation device for radial bearings composed of springs and piezoelectric actuators.

The beneficial effect of the invention is that static load and dynamic excitation can be applied to the test bearing at the same time, thereby simplifying the structure of the bearing test bench and reducing test equipment, and improving the recognition accuracy of the dynamic characteristic coefficient of the bearing.

Description of drawings:

Fig. 1 is a schematic structural diagram of the first embodiment proposed by the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment proposed by the present invention.

Fig. 3 is a schematic structural diagram of a third embodiment proposed by the present invention.

Among them: 1 is the afterburner tile; 2 is the lower tile body of the bearing; 3 is the anti-rotation key; 4 is the cylindrical support block; 5 is the static load butterfly spring; 6 is the static load anti-rotation bearing disc; 7 is the static load anti-rotation Bearing; 8 is a static load screw; 9 is a dynamic load screw; 10 is a dynamic load anti-rotation bearing; 11 is a dynamic load anti-rotation bearing disc; 12 is a piezoelectric actuator; 13 is a dynamic load butterfly spring; 14 is a dynamic load Carry butterfly spring groove; 15 is guide key.

Detailed ways:

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Referring to accompanying drawing 1, the embodiment of the first radial bearing static and dynamic vibration excitation device composed of springs and piezoelectric actuators according to the present invention is the so-called tilting pad radial bearing static and dynamic vibration excitation device. It consists of a static load loading device, a dynamic load excitation device, a lower bearing pad, a cylindrical support block and an afterburner pad. The afterburner tile 1 is a tiltable tile block, and the arc surface of the back groove and the arc surface of the cylindrical ejector rod of the cylindrical support block 4 maintain line contact, and the afterburner tile 1 can wrap around the cylindrical surface The fulcrum of the cylindrical ejector rod of the support block 4 swings freely, and the contact stress can be reasonably controlled by designing the arc surface of the back groove of the afterburner tile 1 and the curvature radius of the cylindrical ejector rod of the cylindrical support block 4 . Cylindrical support block 4 is processed with an outer ring spring seat and an inner ring spring seat on the opposite surface of the cylindrical ejector rod. The static load loading device can apply static load to the test bearing, which consists of bearing lower tile body 2, anti-rotation key 3, static load butterfly spring 5, static load anti-rotation bearing disc 6, static load anti-rotation bearing 7 and static load screw 8 composition. The static load loading screw 8 can rotate in the threaded hole of the bearing lower tile body 2. By adjusting the static load loading screw 8 to compress the static load disc spring 5, the static loading force can be changed. The maximum static load that the static load loading device can exert is 200KN. Static load anti-rotation bearing 7 can adopt thrust bearing, centripetal bearing etc., and it is installed between static load anti-rotation bearing disk 6 and static load screw 8, and its effect is to transmit static load spring force. The static-load butterfly spring 5 is installed between the outer ring spring seat of the cylindrical support block 4 and the static-load anti-rotation bearing disc 6, and the static-load spring force generated by rotating the static-load screw 8 to compress it passes through the cylindrical support block 4 Pass to Garley tile 1. The anti-rotation key 3 is respectively assembled in the keyway of the cylindrical surface support block 4 and the static load anti-rotation bearing disc 6, and its function is to prevent the circumferential rotation of the cylindrical surface support block 4 and the static load anti-rotation bearing disc 6 and to adjust their axis. Oriented towards movement. The dynamic excitation device can apply dynamic excitation to the test bearing, including sine wave excitation, step excitation, pulse excitation, random excitation, pseudo-random excitation, etc. It consists of dynamic load screw 9, dynamic load stop rotation Bearing 10, dynamic load anti-rotation bearing disc 11, piezoelectric actuator 12, dynamic load butterfly spring 13, dynamic load butterfly spring groove 14, the maximum value of the exciting force is greater than or equal to 2000N. The dynamic loading screw 9 can be rotated in the threaded hole of the static loading screw 8 to adjust the initial compression amount of the piezoelectric actuator 12 . Dynamic load anti-rotation bearing 10 can adopt thrust bearing, centripetal bearing etc., and it is installed between dynamic load anti-rotation bearing plate 11 and dynamic load screw 9, and dynamic load screw 9 roots are processed with matching bearing seat. The opposite surface of the bearing seat hole of the dynamic load anti-rotation bearing disc 11 is processed with a cylindrical surface, and its interference fit is in the cylindrical hole of the piezoelectric actuator 12, and the opposite surface of the cylindrical hole of the piezoelectric actuator 12 is processed with a cylindrical surface, and its over Ying fit in the inner hole of the dynamic load disc spring groove 14. The dynamic-loaded disc spring 13 is installed between the inner ring spring seat of the cylindrical support block 4 and the dynamic-loaded disc spring groove 14, and the piezoelectric actuator 12 deforms and compresses the dynamic-loaded disc spring 13 under the action of the control signal. Corresponding to the dynamic exciting force, the dynamic exciting force is transmitted to the afterburner tile 1 through the cylindrical support block 4 . The guide key 15 is installed in the key groove of the outer cylindrical surface of the dynamic load disc spring groove, and its function is to guide the axial movement of the piezoelectric actuator and prevent its circumferential rotation. In order to eliminate the influence of the structural stiffness on the dynamic characteristic test of the bearing, the combined stiffness of the static-loaded disc spring 5 , the dynamic-loaded disc spring 13 and the piezoelectric actuator 12 must be less than 5% of the stiffness of the oil film of the bearing. The static and dynamic excitation device for the tilting pad radial bearing can simultaneously apply static load and dynamic excitation to the test bearing, simplify the structure of the bearing test bench, and improve the identification accuracy of the dynamic characteristic coefficient of the bearing.

Next, refer to the structural schematic diagram shown in Fig. 2 . The embodiment of the second static and dynamic vibration excitation device for radial bearings proposed according to the present invention is a so-called tilting pad radial bearing static and dynamic strong vibration excitation device. It consists of a static load loading device, a dynamic load excitation device, a lower bearing pad, a cylindrical support block and an afterburner pad. The static load loading device, cylindrical support block, bearing lower tile body and booster tile of accompanying drawing 2 are the same as the static load loading device, cylindrical surface support block, bearing lower tile body and booster tile shown in the above-mentioned accompanying drawing 1 , the structure of the dynamic vibration excitation device of accompanying drawing 2 is similar to the structure of the dynamic loading vibration excitation device shown in accompanying drawing 1 above, the difference is that the dynamic loading vibration excitation device of accompanying drawing 2 cancels the dynamic loading disk spring, dynamic loading butterfly Spring groove and feather key. The cylindrical pin head of the piezoelectric actuator 11 is interference fit on the cylindrical support block 4 . The characteristic of the dynamic vibration excitation device adopting this structure is that the rigidity of the dynamic vibration excitation device is enhanced, and the dynamic vibration excitation force generated by it under the same control signal is greater than that produced by the dynamic vibration excitation device shown in Figure 1. Therefore, it is called the static and dynamic strong vibration excitation device of the tilting pad radial bearing.

Finally, refer to the structural schematic diagram shown in Fig. 3 . According to the present invention, the third embodiment of the static and dynamic vibration excitation device for radial bearings composed of springs and piezoelectric actuators is the so-called static and dynamic vibration excitation device for radial bearings with fixed pads. It consists of a static load loading device, a dynamic load excitation device, a lower bearing pad, a cylindrical support block and an afterburner pad. The static load loading device, dynamic load excitation device, bearing lower tile body, cylindrical support block shown in accompanying drawing 3 and the static loading loading device, dynamic load excitation device, bearing lower tile body, The structure of the cylindrical support block is similar, the difference is that the afterburner tile 1 is a fixed tile, and the afterburner tile 1 cannot swing around the fulcrum of the cylinder support block 4 under the action of torque, so it is called the static and dynamic bearing of the fixed tile radial bearing. Vibration device. This static and dynamic excitation device for fixed pad radial bearings can be used for loading excitation of round bearings, elliptical bearings, misplaced round or elliptical bearings, three-lobe bearings, stepped bearings, and some fixed pad bearings with complex profiles or structures. In order to simplify the structure of the bearing test bench and reduce the test equipment, the identification accuracy of the dynamic characteristic coefficient of bearing stiffness and damping is improved.

Claims (7)

1. the quiet dynamic exciting device of transverse bearing that constitutes by spring and piezo-activator, it is characterized in that: it is made up of static load charger, dynamic load exciting device, cylinder back-up block, and the lower half bearing body of transverse bearing is radially passed on the top of static load charger; It is inner that the dynamic load exciting device is installed on the static load charger; The cylinder back-up block is positioned at static load charger top, and contacts with the dynamic load exciting device; The cylinder back-up block equally radially passes the lower half bearing body of transverse bearing; The cylinder back-up block supports the reinforcing watt in the transverse bearing under the effect of static load charger and dynamic load exciting device.

2. device according to claim 1; It is characterized in that: the static load charger comprises that static load screw, static load only revolve bearing, static load and only revolve bearing dish, static load disk spring and only revolve key, makes its compression static load disk spring change static loading force through regulating the static load load screw.

3. device according to claim 1 and 2; It is characterized in that: the dynamic load charger comprises that dynamic load screw, dynamic load only revolve bearing, dynamic load and only revolve bearing dish, piezo-activator, dynamic load disk spring, dynamic load disk spring groove and feather key; The initial compression amount of dynamic load screw adjustable piezoelectric actuator produces distortion compression dynamic load disk spring through piezo-activator and produces the corresponding dynamic exciting force under the control signal effect.

4. device according to claim 3 is characterized in that: the composite rigidity of static load disk spring, dynamic load butterfly spring and piezo-activator needs less than 5% of bearing film rigidity.

5. device according to claim 2 is characterized in that: the maximum static lotus that the static load charger can apply is 200KN.

6. device according to claim 3 is characterized in that: test bearing is applied dynamic exciting: comprise string wave excitation, step exciting, pulse excitation, exciting, pseudorandom exciting etc. at random, the maximal value of exciting force is more than or equal to 2000N.

7. device according to claim 1 is characterized in that: afterburning watt tile fragment type can be can incline watt, the tile fragment of fixing watt or other form.

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