Abstract
To address the problems of mechanical two-stage inerter-spring-damper (ISD) suspension such as excessive suspension elements, complex structure, and problematic engineering implementation, a hydro-pneumatic two-stage ISD suspension, which integrates hydro-pneumatic spring and inerter, is proposed. The full vehicle model of hydro-pneumatic ISD suspension is established based on the AMESim. Simulation analysis is performed to demonstrate the effectiveness and performances of the proposed suspension. The hydro-pneumatic ISD suspension prototype is developed and tested on four-poster tire-coupled road simulator. The results suggest that, compared with single-chamber hydro-pneumatic suspension, the hydro-pneumatic ISD one can significantly reduce the vibrations of the vehicle body and wheels, but at the expense of an excessive increase of suspension working space (SWS). In contrast, although proposed suspension is also a type of dual-chamber hydro-pneumatic one, it can not only reduce these vibrations but also downsize the SWS, which means it is the best choice for a more comfortable and safer ride.
Highlights
Traditional passive suspension is mainly composed of spring and damper, and it has little room for improvement [1,2,3]
Some previous researches on these suspensions highlighted that inerter can add fixed virtual mass to the sprung mass to reduce sprung mass natural frequency and improve ride comfort of vehicles [10,11,12,13,14]. e inerter-spring-damper (ISD) suspension proposed by Smith is a breakthrough in further improving the performance of the spring-damper suspension, which is based on the classical vibration isolation theory [4, 15,16,17,18,19,20]
As for the modeling of single-chamber and dualchamber hydro-pneumatic suspensions, it can be seen from Figure 2 that a short connection between a hydraulic cylinder and the accumulator I is selected in the hydropneumatic ISD model, or a helical channel is replaced with a connecting channel to realize the single-chamber and dualchamber hydro-pneumatic suspension models, respectively, and the corresponding modules in AMESim are used to connect them to realize the simulation model. e main parameters of vehicle model and hydro-pneumatic ISD suspension are presented in Tables 1 and 2 [24,25,26,27,28]
Summary
Traditional passive suspension is mainly composed of spring and damper, and it has little room for improvement [1,2,3]. E inerter-spring-damper (ISD) suspension proposed by Smith is a breakthrough in further improving the performance of the spring-damper suspension, which is based on the classical vibration isolation theory [4, 15,16,17,18,19,20]. Zhang proposed a two-stage ISD suspension to realize the skyhook damper configuration passively and verified the effectiveness of the implementation scheme through simulation and bench test [21, 22]. E simulation and experiments in [23] proved that the mechanical two-stage ISD suspension has good performance in reducing vibration and it has potential for broad application, but the problems such as excessive suspension components and complex structure still exist. Simulator to verify if the proposed ISD suspension outperforms the dual-chamber hydro-pneumatic one
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