A comparative study of vibration isolation performance using negative stiffness and inerter dampers

2019 ◽  
Vol 356 (14) ◽  
pp. 7922-7946 ◽  
Author(s):  
Xiang SHI ◽  
Songye ZHU
Keyword(s):  
Comparative Study ◽  
Vibration Isolation ◽  
Negative Stiffness ◽  
Vibration Isolation Performance ◽  
Isolation Performance

An innovative X-shaped vibration isolation mount with tunable quasi-zero-stiffness property

2021 ◽  
Vol 263 (3) ◽  
pp. 3011-3022
Author(s):  
Jing Bian ◽  
Xingjian Jing ◽  
Yishen Tian
Keyword(s):  
Vibration Isolation ◽  
Negative Stiffness ◽  
Design Parameters ◽  
Property A ◽  
Vibration Displacement ◽  
Stiffness Property ◽  
Passive Vibration Isolation ◽  
Engineering Practices ◽  
Vibration Isolation Performance ◽  
Isolation Performance

Passive vibration isolation is always preferable in many engineering practices. To this aim, an innovative, compact, and passive vibration isolation mount is studied in this paper. The novel mount is adjustable to different payloads due to a special oblique and tunable stiffness mechanism, and of high vibration isolation performance with a wider quasi-zero-stiffness range due to the deliberate employment of negative stiffness of the X-shaped structure. The X-shaped structure has been well studied recently due to its excellent nonlinear stiffness and damping properties. In this study, by using of the negative stiffness property within the X-shaped structure, the X-shaped mount (X-mount) can have an obviously larger vibration displacement range which maintains the quasi-zero-stiffness property. A special oblique spring is thus introduced such that the overall equivalent stiffness can be much easily adjusted. Systematic parametric study is conducted to reveal the critical design parameters and their relationship with vibration isolation performance. A prototype and experimental validations are implemented to validate the theoretical results. It is believed that the X-mount would provide an innovative technical upgrade to many existing vibration isolation mounts in various engineering practices and it could also be the first prototyped mount which can offer adjustable quasi-zero stiffness conveniently.

Improvement of Vibration Isolation Performance of Isolation System Using Negative Stiffness Structure

2016 ◽  
Vol 21 (3) ◽  
pp. 1561-1571 ◽  
Author(s):  
Thanh Danh Le ◽  
Minh Truong Ngoc Bui ◽  
Kyoung Kwan Ahn
Keyword(s):  
Vibration Isolation ◽  
Negative Stiffness ◽  
Isolation System ◽  
Vibration Isolation Performance ◽  
Isolation Performance

scholarly journals Theoretical Modeling and Vibration Isolation Performance Analysis of a Seat Suspension System Based on a Negative Stiffness Structure

2021 ◽  
Vol 11 (15) ◽  
pp. 6928
Author(s):  
Xin Liao ◽  
Ning Zhang ◽  
Xiaofei Du ◽  
Wanjie Zhang
Keyword(s):  
Vibration Isolation ◽  
Vibration Suppression ◽  
Ride Comfort ◽  
Dynamic Stiffness ◽  
Suspension System ◽  
Negative Stiffness ◽  
Nonlinear Dynamic Model ◽  
Seat Suspension ◽  
Vibration Isolation Performance ◽  
Isolation Performance

In this study, to improve the vibration isolation performance of a cab seat and the ride comfort of the driver, we propose a mathematical model for a seat suspension system of a construction machinery cab based on a negative stiffness structure (NSS). First, a static analysis of a seat suspension system is conducted and the different parameters and their influences on the dynamic stiffness are discussed. Thereby, the ideal configuration parameter range of the suspension system is obtained. Moreover, the nonlinear dynamic model of the designed seat suspension system is established. The frequency response and the stability are analyzed by using the HBM method and numerical simulation. The vibration transmissibility characteristics and vibration suppression effects of the seat suspension system are presented in detail. The results show that, as compared with a quasi-zero-stiffness system, the QZS-IE system has higher vibration suppression advantages under large excitation and small damping, as well as lower transmissibility and a wider vibration isolation frequency range. In addition, an inerter element with a larger mass ratio and relatively shorter distance ratio is better for vibration isolation performance of the QZS-IE system in a practical engineering application. The results of this study provide a scientific basis for the design and improvement of a seat suspension system.

Design and Dynamic Characteristics of a Torsion Isolator With Negative Stiffness Structures

2016 ◽  
Author(s):  
Hui Liu ◽  
Xiaojie Wang ◽  
Weida Wang ◽  
Changle Xiang
Keyword(s):  
Harmonic Balance ◽  
Vibration Isolation ◽  
Harmonic Balance Method ◽  
Negative Stiffness ◽  
Frequency Range ◽  
Disk Structure ◽  
Vibration Transmissibility ◽  
Low Stiffness ◽  
Vibration Isolation Performance ◽  
Isolation Performance

This paper proposes a torsion isolator with negative stiffness structures, which has low stiffness. The torsion isolator has been designed into disk structure, which is the installation position of the positive springs and negative stiffness structures. In this paper, the model of the torsion isolator is introduced firstly, and the nonlinear stiffness and torque are studied under different compression deformation of springs in negative stiffness structures. Then a two-degree-freedom equation of the torsional isolator is established and vibration transmissibility is obtained by using Harmonic Balance Method. Theoretical analysis results show that the isolator with negative stiffness structures has larger isolation frequency range than linear isolator. Finally, an initial experiment is completed. The experimental results show that the isolator has a good vibration isolation performance.

scholarly journals A Vibration Isolation System Using the Negative Stiffness Corrector Formed by Cam-Roller Mechanisms with Quadratic Polynomial Trajectory

2020 ◽  
Vol 10 (10) ◽  
pp. 3573 ◽  
Author(s):  
Mengnan Sun ◽  
Zhixu Dong ◽  
Guiqiu Song ◽  
Xingwei Sun ◽  
Weijun Liu
Keyword(s):  
Vibration Isolation ◽  
Quadratic Polynomial ◽  
Negative Stiffness ◽  
Calculation Error ◽  
Vibration Isolator ◽  
Isolation System ◽  
Frequency Wave ◽  
Vibration Isolation System ◽  
Vibration Isolation Performance ◽  
Isolation Performance

The vibration isolator equipped with a negative stiffness corrector (NSC) excels at vibration isolation, but its stiffness often presents complex nonlinearity which needs to be approximated in calculation. To avoid the harmful effects of approximate stiffness, the NSC formed by the cam-roller mechanism with a quadratic polynomial trajectory (QCRM) is proposed to construct the vibration isolation system. From the inherent geometrical relationship in the structure, the generation mechanism of high-static-low-dynamic stiffness is analyzed, and the quasi-zero stiffness (QZS) condition of the system is derived. Based on the dynamic model of the QZS vibration isolator, the functions of response characteristics are solved by the harmonic balance method. Then, the absolute displacement transmissibility with different parameter values, and the vibration isolation performance under sinusoidal, multi-frequency wave, and random excitations are discussed. The simulated results show that the stiffness expression of the proposed QZS vibration isolator is directly a quadratic function, which removes the calculation error caused by approximate stiffness at large displacement and broadens the available isolation displacement range. Introducing the QCRM-NSC can significantly suppress the low-frequency vibration and resonance response without changing the load-bearing capacity of the vibration isolator. Under various excitations, the vibration isolation performance of the QZS vibration isolator all outperforms the linear counterpart.

A Variable Positive-Negative Stiffness Joint with Low Frequency Vibration Isolation Performance

Measurement ◽  
2021 ◽  
pp. 110046
Author(s):  
Renzhen Chen ◽  
Xiaopeng Li ◽  
Zemin Yang ◽  
Jinchi Xu ◽  
Hexu Yang
Keyword(s):  
Vibration Isolation ◽  
Low Frequency ◽  
Negative Stiffness ◽  
Low Frequency Vibration ◽  
Vibration Isolation Performance ◽  
Isolation Performance

scholarly journals Design of cab seat suspension system for construction machinery based on negative stiffness structure

2021 ◽  
Vol 13 (8) ◽  
pp. 168781402110449
Author(s):  
Xin Liao ◽  
Xiaofei Du ◽  
Shaohua Li
Keyword(s):  
Vibration Isolation ◽  
Ride Comfort ◽  
Suspension System ◽  
Negative Stiffness ◽  
Construction Machinery ◽  
Seat Suspension ◽  
Vibration Transmissibility ◽  
Suspension Structure ◽  
Vibration Isolation Performance ◽  
Isolation Performance

In order to improve the vibration isolation performance of cab seat and ride comfort of the driver, a seat suspension structure of construction machinery cab is proposed based on negative stiffness structure (NSS) in this paper. The influences of different parameters of suspension system on dynamic stiffness are analyzed. The configuration parameter range of suspension system is obtained. Then, the nonlinear dynamic equation of the seat suspension system is established and the NSS optimization model is proposed. The vibration transmissibility characteristics of suspension structure are analyzed by different methods. The results show that the displacement and acceleration amplitude of optimized seat suspension system are obviously reduced, and the VDV and RMS in the vertical vibration direction for the seat are respectively decreased by 87% and 86%. The vibration transmissibility rate SEAT and the Ttrans are both decreased. Moreover, the peak frequencies of the vibration transmitted to the driver are not near the key frequency values which are easy to cause human discomfort. It indicates that the design of seat suspension system has no effect on the health condition of the driver after being vibrated. The advantages of vibration isolation performance of the designed NSS suspension system are demonstrated, improving the driver’s ride comfort and the working environment.

On vibration isolation of sandwich plate with periodic hollow tube core

2017 ◽  
Vol 21 (3) ◽  
pp. 1119-1132 ◽  
Author(s):  
Gui-Lan Yu ◽  
Hong-Wei Miao
Keyword(s):  
Vibration Isolation ◽  
Sandwich Plate ◽  
Experimental Studies ◽  
Low Frequency ◽  
Dispersion Relations ◽  
Frequency Responses ◽  
Vibration Attenuation ◽  
Potential Applications ◽  
Vibration Isolation Performance ◽  
Isolation Performance

The vibration isolation performance of a PC sandwich plate with periodic hollow tube core is investigated experimentally and numerically. The experiment results reveal that there exist vibration attenuation zones in acceleration frequency responses which can be improved by increasing the number of periods or tuning some structure parameters. The presence of soft fillers shifts the attenuation zone to lower frequencies and enhances the capability of vibration isolation to some extent. Dispersion relations and acceleration frequency responses are calculated by finite element method using COMSOL MULTIPHYSICS. The attenuation zones obtained by experiments fit well with that by simulations, and both are consistent with the band gap in dispersion relations. The numerical and experimental studies in the present paper show that this PC sandwich plate exhibits a good performance on vibration isolation in low frequency ranges, which will provide some useful references for relevant research and potential applications in vibration propagation manipulations.

Sign in / Sign up

Export Citation Format

Share Document