CN115807833A - Vertical-torsional nonlinear vibration absorption structure - Google Patents

Abstract

The invention relates to a vertical-torsional nonlinear vibration-absorbing structure, comprising: a movement mechanism, a connecting straight rod, and a fixing mechanism. Corresponding grooves are engraved on one side, and the two ends of the connecting straight rods are respectively connected to the grooves between the moving mechanism and the fixed mechanism. The connecting straight rods are not perpendicular to the surfaces of the two mechanisms, but are inclined at a certain angle. The vibration-absorbing structure utilizes its own torsion characteristics to convert the displacement in the vertical direction into the displacement in the torsional direction, thereby realizing the elimination of vibration in the vertical direction. The invention can effectively absorb the vibration energy of the vibrator, can be widely used in various vibration environments, has the advantages of small mass, small installation space, high reliability, convenient installation and maintenance, and durability.

Description

A vertical-torsional nonlinear vibration-absorbing structure

technical field

The invention relates to the field of mechanical vibration reduction, in particular to a vertical-torsion nonlinear vibration-absorbing structure.

Background technique

Vibration control is of great significance in engineering fields such as military, infrastructure, aerospace, precision measurement and control. The linear vibration absorber is the earliest and most common vibration suppression device in the field of passive control. However, it is very sensitive to the operating frequency, and the efficiency will drop rapidly outside the operating frequency domain; it is particularly important that it will affect the free vibration characteristics of the original system. Change the original design performance. As an improvement, nonlinearity will be used in this damper. Since there is no linear resonance frequency, the nonlinear damper can realize broadband vibration control without affecting the free vibration characteristics of the original system. Different from the previous nonlinear shock absorber structure, the shock absorber designed this time introduces a torsional structure, which has more possibilities and feasibility in terms of vibration elimination and vibration reduction efficiency.

Contents of the invention

Aiming at the defects existing in the prior art, the present invention proposes a vertical-torsion nonlinear vibration-absorbing structure, which converts the vertical displacement into torsional displacement, and changes the energy transmission mode of the existing vibration-absorbing structure; The direction of the vibrator reduces the range of motion of the vibrator, reduces the volume space required to a certain extent, improves the convenience of installation, improves the efficiency of vibration control, and is suitable for vibration reduction in various vibration environments.

To achieve the above object, design of the present invention is:

The device requiring shock absorption is connected with the motion mechanism of the vibration-absorbing structure, and when it vibrates to generate displacement, the motion mechanism will also generate displacement accordingly. Through connecting straight rods with a certain inclination angle, the kinematic mechanism also produces torsional motion while moving. This deformation causes the vibration damping system to generate nonlinear torque, and at the same time brings additional nonlinear restraint torque to the device to be damped. The restraint torque can be realized by designing the parameters and number of connecting straight rods. Adjust and expand the frequency band of vibration elimination to improve the efficiency of vibration elimination.

According to above-mentioned design, the present invention adopts following technical scheme:

A vertical-torsion nonlinear vibration-absorbing structure, comprising: a moving mechanism, a connecting straight rod, and a fixing mechanism. There are corresponding grooves, the two ends of the connecting straight rods are respectively connected to the grooves between the moving mechanism and the fixed mechanism, and the connecting straight rods are not perpendicular to the surfaces of the two mechanisms, but inclined at a certain angle.

The grooves on the moving mechanism and the fixing mechanism are distributed at equal intervals around the center.

Compared with the prior art, the present invention has the beneficial effects:

The invention designs a nonlinear torsion structure, does not change the natural frequency of the original structure, and has broadband vibration absorption effect. The moving mechanism and the fixing mechanism of the invention are connected by rods, which reduces the size and quality of the vibrator, improves the vibration control efficiency, and is applicable to various vibration environments, including micro-vibration environments. The invention is installed at the structural support, and is easy to maintain; adopts a passive control strategy, has a reliable structure, low cost, high performance, and durability.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of the groove of the kinematic mechanism.

In the figure: 1. Movement mechanism; 2. Connecting straight rod; 3. Fixing mechanism;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a vertical-torsion nonlinear vibration-absorbing structure includes: a moving mechanism 1, a connecting straight rod 2, and a fixing mechanism 3. One side of the moving mechanism 1 is connected to the structure to be damped, and the other side is engraved with Grooves, one side of the fixing mechanism 3 is engraved with corresponding grooves, and the grooves are distributed at equal intervals around the center, as shown in Figure 2; the two ends of the plurality of connecting straight rods 2 are respectively connected to the moving mechanism 1 and the fixing mechanism 3 The groove between the connecting straight rods 2 is not perpendicular to the surfaces of the two mechanisms, and is inclined at a certain angle.

Since the connecting straight rod 2 is in an inclined state at the initial moment, one end of it will rotate with the movement mechanism 1 in order to ensure the normal displacement of the structure, so as to increase or reduce the distance between the movement mechanism 1 and the fixed mechanism 3, so that the movement structure 1 is vertical. Torsion occurs during motion, allowing the system to generate nonlinear torsional constraints to achieve the effect of vibration elimination.

Since the space occupied by the vibration-absorbing structure is basically determined, there is no need to specially design and reserve movement space for the vibration-absorbing structure, which reduces the design work and improves the utilization efficiency of the carrier space.

The vertical-torsion nonlinear vibration-absorbing structure of the above embodiment uses its own torsional characteristics to convert the displacement in the vertical direction into the displacement in the torsional direction, so as to eliminate the vibration in the vertical direction. The device is mainly composed of a moving mechanism, a fixing mechanism, and several connecting straight rods. The above embodiments of the present invention can effectively absorb the vibration energy of the vibrator, and can be widely used in various vibration environments, with small mass, small installation space, high reliability, convenient installation and maintenance, and durability.

The embodiment of the present invention has been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiment, and various changes can also be made according to the purpose of the invention of the present invention. The changes, modifications, substitutions, combinations or simplifications should all be equivalent replacement methods, as long as they meet the purpose of the invention, as long as they do not deviate from the technical principle and inventive concept of the invention, they all belong to the protection scope of the invention.

Claims (2)

1. A vertical-torsional nonlinear vibration absorbing structure, comprising: the damping mechanism comprises a moving mechanism (1), a connecting straight rod (2) and a fixing mechanism (3), wherein one surface of the moving mechanism (1) is connected with a damped structure, a groove is formed in the other surface of the moving mechanism, a corresponding groove is formed in one surface of the fixing mechanism (3), two ends of the connecting straight rod (2) are respectively connected with the groove between the moving mechanism (1) and the fixing mechanism (3), and the connecting straight rod (2) is not perpendicular to the surfaces of the two mechanisms and is inclined at a certain angle.

2. The vertical-torsional nonlinear vibration absorbing structure according to claim 1, characterized in that the grooves on the moving mechanism (1) and the fixing mechanism (3) are equally spaced around the center.

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