A novel quasi-zero-stiffness strut and its applications in six-degree-of-freedom vibration isolation platform

This paper investigates the energy-efficiency design of adaptive control for active suspension systems with a bioinspired nonlinearity approach To this aim, a bioinspired dynamics-based adaptive tracking control is proposed for nonlinear suspension systems In many existing techniques, one important effort is used for canceling vibration energy transmitted by suspension inherent nonlinearity to improve ride comfort Unlike existing methods, the proposed approach takes full advantage of beneficial nonlinear stiffness and damping characteristics inspired by the limb motion dynamics of biological systems to achieve advantageous nonlinear suspension properties with potentially less energy consumption The stability analysis of the desired bioinspired nonlinear dynamics is conducted within the Lyapunov framework Theoretical analysis and simulation results reveal that the proposed bioinspired nonlinear dynamics-based adaptive controller has a significant impact on the amount of energy consumption, considering the same basic control method and random excitation of road irregularity for a similar ride comfort performance

A Bioinspired Dynamics-Based Adaptive Tracking Control for Nonlinear Suspension Systems

Post-capture vibration suppression of spacecraft via a bio-inspired isolation system

Design of a quasi-zero stiffness isolation system for supporting different loads

Superior nonlinear passive damping characteristics of the bio-inspired limb-like or X-shaped structure

Inspired by the limb structures of animals/insects in motion vibration control, a bio-inspired limb-like structure (LLS) is systematically studied for understanding and exploring its advantageous nonlinear function in passive vibration isolation. The bio-inspired system consists of asymmetric articulations (of different rod lengths) with inside vertical and horizontal springs (as animal muscle) of different linear stiffness. Mathematical modeling and analysis of the proposed LLS reveal that, (a) the system has very beneficial nonlinear stiffness which can provide flexible quasi-zero, zero and/or negative stiffness, and these nonlinear stiffness properties are adjustable or designable with structure parameters; (b) the asymmetric rod-length ratio and spring-stiffness ratio present very beneficial factors for tuning system equivalent stiffness; (c) the system loading capacity is also adjustable with the structure parameters which presents another flexible benefit in application. Experiments and comparisons with existing quasi-zero-stiffness isolators validate the advantageous features above, and some discussions are also given about how to select structural parameters for practical applications. The results would provide an innovative bio-inspired solution to passive vibration control in various engineering practice.

https://iopscience.iop.org/article/10.1088/1748-3190/10/5/056015/pdf

Vibration isolation by exploring bio-inspired structural nonlinearity

A 6DOF passive vibration isolator using X-shape supporting structures

Vibration isolation properties of the nonlinear X-combined structure with a high-static and low-dynamic stiffness: Theory and experiment

In this study, a bio-inspired structure is investigated for its vibration isolation potential as a passive component. With mathematical modeling and nonlinear analysis, it is shown that the structure can be effectively used for passive vibration isolation with a high-static-low-dynamic stiffness property and the isolation performance can be designed flexibly with several structural parameters. This potentially provides an innovative approach to a large spectrum of engineering practice for noise and vibration control.

Zhijing Wu

Papers

Vibration isolation by exploring bio-inspired structural nonlinearity

A 6DOF passive vibration isolator using X-shape supporting structures

Vibration isolation properties of the nonlinear X-combined structure with a high-static and low-dynamic stiffness: Theory and experiment

A bio-inspired structure for vibration isolation

An analytical model for thermoelastic damping in laminated microring resonators