Abstract
This paper concerns the optimal problem of the vehicle ISD (inerter-spring-damper) suspension based on the asymmetric-damping effect. In order to explore the benefits of the asymmetric damping, a quarter car model of the four-element ISD suspension is built by considering the symmetric and asymmetric reciprocating damping factors. The parameters of the proposed vehicle ISD suspension with symmetric-damping and asymmetric-damping features are optimized by means of the genetic algorithm in single-objective scenario and multiobjective scenario, respectively. The dynamic performances are analyzed through simulations in time and frequency domains, and the impacts of the compression and tensile damping on the body acceleration, the suspension working space, and the dynamic tire load are discussed. Results indicate that, compared with the conventional passive suspension, the proposed ISD suspensions manifest excellent vibration isolation performance, and the asymmetric reciprocating damping ISD suspension even showcases extra improving space of the dynamic performances except for the dynamic tire load in the impulse input condition. It seems that the dynamic performance of the vehicle ISD suspension will be much superior when considering the asymmetric reciprocating damping factors.
Highlights
As one of the linchpins of the vehicle chassis system, the suspension system can exert significant influences on ride comfort and vehicle handling performance
In order to unravel the secret of how the asymmetry of damper may act on the body acceleration, the suspension working space, and the dynamic tire load, those three dynamic characteristics are regarded as response variables while the coefficients of tensile damping and compression damping are regarded as independent variables. is paper makes the two independent variables change in the region of [500, 3500] N·s·m−1 with a certain step size; results are shown in Figures 9 and 10
The root mean square (RMS) of suspension working space tends to decrease a bit before increase, meaning that performance may turn better initially and fall down subsequently. When those two coefficients change within the region of [2000, 3000] N·s·m−1, the RMS of dynamic tire load shows negligible fluctuations, differing from the situation that the dynamic tire load has increased in acceleration when one coefficient drops in the region of [500, 2000] N·s·m−1 while the other remains unchanged, meaning that there may be some performance degradation when the two coefficients are lower than 2000 N·s·m−1, which should be averted while designing the ISD suspension
Summary
As one of the linchpins of the vehicle chassis system, the suspension system can exert significant influences on ride comfort and vehicle handling performance. More complex suspension structures, such as HIISDS (hydraulically interconnected inerter-spring-damper suspension) [24] and HEI (hydraulic electric inerter) suspension, comprised of a hydraulic piston inerter and a linear motor, which considers a bicubic impedance function in the optimal design of a vehicle suspension system employing both mechanical and electrical elements [25], were used to counterbalance the conflict between vehicle ride comfort and handling stability. Research studies above are all concentrated on the structural design and nonlinearity analysis without considering the asymmetry of reciprocating damping.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
