Characteristic analysis of vibration isolation system based on high-static-low-dynamic stiffness

The vibration isolation system using a pair of oblique springs or a spring-rod mechanism as a negative stiffness mechanism exhibits a high-static low-dynamic stiffness characteristic and a nonlinear jump phenomenon when the system damping is light and the excitation amplitude is large. It is possible to remove the jump via adjusting the end trajectories of the above springs or rods. To realize this idea, the article presents a vibration isolation system with a cam–roller–spring–rod mechanism and gives the detailed numerical and experimental studies on the effects of the above mechanism on the vibration isolation performance. The comparative studies demonstrate that the vibration isolation system proposed works well and outperforms some other vibration isolation systems.

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Dynamic Research and Design on SINS Damping System in Vehicle

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.328-330.1679 ◽

2011 ◽

Vol 328-330 ◽

pp. 1679-1683

Author(s):

Jie Li ◽

Rui Ping Tao ◽

Jun Liu ◽

Wei Chen

Keyword(s):

Vibration Isolation ◽

Inertial Navigation ◽

Vibration Damping ◽

Test Results ◽

Characteristic Analysis ◽

Isolation System ◽

Vibration Isolation System ◽

System Vibration ◽

Research And Design ◽

Damping Model

For the vibration noise problem of strap-down inertial navigation system in the vehicle, a better vibration damping system was designed. Based on the vibration characters of the vehicle environment, a vibration damping model fitted the SINS in the vehicle was presented; and then the mechanism of vibration damping system was designed especially; and then the design of vibration damping system was verified by using of the dynamic characteristic analysis, On the basis of the above analysis, the overall structure of actual vibration isolation system was built, and then the test for the vibration isolation system was made, the results show that the micro-isolation system for the SINS system vibration and noise has a better inhibition effect, and the applicability and the dependability of the vibration damping system is verified by the test results, which provides reference basis for the design of the strap-down inertial navigation damping system in the land vehicle and provides techniques for the better application of SINS in other fields.

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Experimental Investigation of a Two-Stage Nonlinear Vibration Isolation System With High-Static-Low-Dynamic Stiffness

Journal of Applied Mechanics ◽

10.1115/1.4034989 ◽

2016 ◽

Vol 84 (2) ◽

Cited By ~ 25

Author(s):

Zeqi Lu ◽

Tiejun Yang ◽

Michael J. Brennan ◽

Zhigang Liu ◽

Li-Qun Chen

Keyword(s):

Nonlinear Vibration ◽

Composite Plate ◽

Vibration Isolation ◽

Dynamic Stiffness ◽

Composite Plates ◽

Negative Stiffness ◽

Two Stage ◽

Isolation System ◽

Vibration Isolation System ◽

Static Test

A novel design of a two-stage nonlinear vibration isolation system, with each stage having a high-static-low-dynamic stiffness (HSLDS), is studied experimentally in this paper. The positive stiffness in each stage is realized by a metallic plate, and the corresponding negative stiffness is realized by a bistable carbon fiber–metal (CF) composite plate. An analytical model is developed as an aid to design a bistable composite plate with the required negative stiffness, and a static test of the plate is conducted to measure the actual stiffness of the plate. Dynamic tests of the two-stage isolator are carried out to determine the effectiveness of the isolator. Two tests are conducted, one with the bistable composite plates removed so that the isolator behaves as a linear device and one with the bistable composite plates fitted. An improvement in the isolator transmissibility of about 13 dB at frequencies greater than about 100 Hz is achieved when the bistable composite plates are added.

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Research on Modeling and Optimization of a Dual Chamber Air Spring Vibration Isolation System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.702.310 ◽

2013 ◽

Vol 702 ◽

pp. 310-317 ◽

Cited By ~ 2

Author(s):

Cheng Zhang ◽

Jian Fu Zhang ◽

Ping Fa Feng ◽

Ding Wen Yu ◽

Zhi Jun Wu

Keyword(s):

Vibration Isolation ◽

Structural Parameters ◽

Dynamic Stiffness ◽

Theoretical Models ◽

Air Spring ◽

Dual Chamber ◽

Isolation System ◽

Vibration Isolation System ◽

Spring System ◽

Stiffness And Damping

To improve the vibration isolation performanceof an air spring system,the characteristics of the dynamic stiffness and damping of adual chamber air springwere first analyzed. A theoretical model ofa four dual chamber air springs system wasthen constructed,and through experimental verification,the theoretical and experimental curves showedthe same change trend.Based on the theoretical models, anobjective function used to optimize the structural parameters of an air springwas constructed. It was demonstrated that the vibration isolation performance of the air spring system was improved with the optimized parameters.

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