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Active nonlinear broadband vibration absorber and regulation and control method thereof

A non-linear and active technology, applied in the direction of shock absorber, shock absorber, spring/shock absorber, etc., can solve the problem of reducing the vibration absorption effect of the shock absorber, and achieve good suppression effect, convenient control and simple structure

Active Publication Date: 2021-10-29
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents can achieve broadband vibration absorption within a certain frequency range, they all use a linear system to complete the vibration absorption of the main system, which will cause the coupling system composed of the vibration absorber system and the main system to have two natural frequencies, resulting in New resonance peaks are introduced on both sides near the resonance frequency of the system to reduce the vibration absorption effect of the vibration absorber

Method used

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  • Active nonlinear broadband vibration absorber and regulation and control method thereof
  • Active nonlinear broadband vibration absorber and regulation and control method thereof
  • Active nonlinear broadband vibration absorber and regulation and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, the active nonlinear broadband vibration absorber provided in this embodiment includes a bottom plate 1 and a vibration-absorbing module, and the vibration-absorbing module includes a support mechanism 2 , a vibration-absorbing mass 3 , an adjustment mechanism 4 and an anti-tilt assembly 5 .

[0043] In practice, the bottom plate 1 can be designed as a rectangular plate, the bottom surface of which is used to connect with the main system, and the top surface of which is used to install the vibration-absorbing module.

[0044] Such as figure 1 , figure 2 As shown, the vibration-absorbing module includes a support mechanism 2, a vibration-absorbing mass 3, an adjustment mechanism 4, and an anti-tilt assembly 5. The support mechanism 2 is arranged in the length direction of the bottom plate 1, and the vibration-absorbing mass 3 is assembled on the top of the support mechanism 2. A pair of The adjustment mechanism 4 is symmetrically arranged on...

Embodiment 2

[0052] Such as image 3 As shown, in this embodiment, a control module is added on the basis of the first embodiment. The control module includes a stepper motor driver 6, a controller 7, an acceleration sensor 8 and a displacement sensor 9, the acceleration sensor 8 is connected to external environment excitation, the controller 7 is connected to the acceleration sensor 8, and the stepper motor driver 6 is connected to the controller 7, The stepping motors are respectively connected with the stepping motor drivers 6 . The displacement sensor 9 is used to collect the displacement signal of the main system, the acceleration sensor 8 is used to collect the acceleration signal of external excitation, the controller 7 analyzes and processes the collected acceleration signal and displacement signal, and transmits the control signal to the stepper motor driver 6 Realize the control of the stepper motor.

Embodiment 3

[0054] This embodiment provides a control method for an active nonlinear broadband vibration absorber, such as Figure 4 , Figure 5 , Figure 6 As shown, the method includes the following steps:

[0055] S1: According to the stiffness coefficient and initial length of the horizontal spring on the left, the stiffness coefficient and initial length of the horizontal spring on the right, and the stiffness coefficient, mass ratio and damping ratio of the vertical elastic member, three main system frequency response curves are obtained;

[0056] S2: Take the abscissa value corresponding to the intersection point between the three frequency response curves as the frequency control threshold, divide the excitation frequency into four segments, and store the interval segment data in the controller;

[0057] S3: Obtain the external excitation acceleration of the main system in real time through the acceleration sensor, and perform Fourier transform through the controller to determin...

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Abstract

The invention discloses an active nonlinear broadband vibration absorber and a regulation and control method thereof. The active nonlinear broadband vibration absorber comprises a bottom plate and a vibration absorption module; the vibration absorption module comprises a supporting mechanism, a vibration absorption mass block and an adjusting mechanism; the supporting mechanism comprises a first mounting seat, a vertical elastic piece and a second mounting seat; the first mounting seat is arranged on the bottom plate; one end of the vertical elastic piece is connected with the first mounting seat; the other end of the vertical elastic piece is connected with the second mounting seat; the vibration absorption mass block is arranged on the second mounting seat; the adjusting mechanism comprises a horizontal elastic piece; the adjusting mechanism is arranged on the bottom plate; the horizontal elastic piece is connected with the second mounting seat; the adjusting mechanism is used for generating nonlinear force in the vertical direction so as to dynamically adjust the rigidity of the supporting mechanism; and the vibration absorption module is connected with a main system through the bottom plate. The response peak value of the main system at the resonant frequency can be suppressed, and the new formants on the two sides of the resonant frequency can be eliminated. By dynamically adjusting the rigidity of the vibration absorber, the broadband vibration absorption effect is achieved, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of vibration control, in particular to an active nonlinear broadband vibration absorber and a control method thereof. Background technique [0002] For precision instruments and equipment, vibration will reduce the precision and smoothness of machining, aggravate the fatigue and wear of components, and affect product quality and production efficiency. In order to reduce the harm caused by vibration, vibration absorbers have always been the focus of engineering research. Vibration absorbers can be divided into active and passive types according to whether external energy is required during operation. Active vibration absorbers can usually change their own vibration-absorbing frequency range according to changes in the external excitation frequency, and can adapt to more complex working conditions. Domestic Patent No. 200510094882.3 discloses a magneto-rheological elastomer frequency-shifting vibration absorb...

Claims

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Application Information

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IPC IPC(8): F16F7/104
CPCF16F7/104F16F2222/08Y02T90/00
Inventor 周振华唐驿宇戴志辉周民瑞刘志强刘鑫
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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