Design And Performance Study Of Semi-active ISD Suspension Based On Network Synthesis

In recent years,with the increasing influence of vehicle in people’s life and the continuous increase in the number of vehicle,people have higher and higher requirements for vehicle performance,such as vehicle comfort,safety,and road holding,etc.The suspension system is an important factor affecting the above performances.It is of great practical significance to research and develop excellent performance suspension systems to improve the overall performance of the vehicle.In suspension design,a semi-active suspension reflects the advantages of passive suspension in terms of simple and stable,as well as the excellent performance of active suspension in dealing with complex road conditions.With the emergence of an inerter,the"Inerter-Spring-Damper（ISD）"suspension has been highly concerned about.In this context,the advantages of semi-active control the inerter for the passive suspension are utilized in this paper,A quarter-vehicle model is taken as the research object.The a semi-active ISD suspension is designed where the suspension is divided into passive and semi-active control parts.And research and analysis are conducted from theoretical,simulation,and experimental aspects.The main research content of this paper includes:（1）Based on a quarter-car model,an ideal Sky-hook inerter suspension model was established,and a robust controller with the ideal Sky-hook inerter was designed.The positive real lemma and H₂ control principles were processed by the linear matrix inequality method.Two passive suspension structures were designed and implemented using genetic algorithms and the passive network synthesis theory in mechanical-electrical analogies.（2）A semi-active implementation of the ISD suspension system with the ideal Sky-hook inerter was achieved by both on-off control and continuous control strategies,and four types of semi-active ISD suspensions were synthesized.The particle swarm optimization algorithm was used to optimize the parameters of these suspensions.The performance of the suspensions was simulated under different road conditions and speeds after optimization,and their performance was compared with that of traditional passive and semi-active suspensions in both time and frequency domains.（3）Prototype experiments were conducted on the semi-active ISD suspension.Based on the nonlinear factors,a switchable inerter was designed tested to validate its characteristic.Based on the inerter,an experimental platform for the semi-active ISD suspension using the on-off control was constructed.With a traditional“Spring-Damping”（SD）passive suspension as a comparison,the performance of the semi-active ISD suspension was verified.The experimental results were in good agreement with theoretical analysis,which achieves the goal of optimizing the suspension’s vibration reduction performance with the design in this paper.This article combines theories in various related fields,including mechanical-electrical analogies,passive network synthesis,semi-active control,intelligent optimization and mechanical design with nonlinear analysis.Research on the design and performance analysis of a semi-active ISD suspension is conducted from the perspectives of structural design,simulation analysis,and experimental validation,providing an effective approach for the vehicle suspension design.