Abstract
Aiming to improve the road friendliness so as to reduce the road damage caused by heavy multi-axle vehicles, and to enhance the ride comfort, we propose a kind of hydro-pneumatic ISD suspension structure, which is equivalent to a two-stage ISD structure integrating a traditional hydro-pneumatic suspension and a fluid inerter. Firstly, based on the 1/4 model, a genetic algorithm is used to optimize the key structural parameters of hydro-pneumatic ISD suspension. Secondly, the AMESim dynamic model of heavy multi-axle vehicles is built for the performance comparison between the traditional hydraulic and hydro-pneumatic ISD suspensions. Finally, this paper machines a hydro-pneumatic ISD suspension to replace the traditional hydraulic one in a heavy multi-axle vehicle to carry out a road test. Test results indicate that the proposed suspension can effectively restrain the vibrations of sprung and unsprung mass and improve ride comfort as well as road friendliness. The hydro-pneumatic ISD suspension can be applied to engineering.
Highlights
The suspension is an important part of the vehicle, and it has a great influence on ride comfort, handling stability, and ride safety.[1,2,3]
The hydro-pneumatic suspension system was initially developed by Citroen in the 1950s and applied to the DS19 model.[5]
Based on the studies of hydraulic inerter,[13] this paper integrates traditional hydro-pneumatic suspension and hydraulic inerter to design a new type of hydro-pneumatic ISD suspension.[14]
Summary
The suspension is an important part of the vehicle, and it has a great influence on ride comfort, handling stability, and ride safety.[1,2,3] Traditional passive suspensions are mainly composed of mechanical spring and damper.[4]. Based on the studies of hydraulic inerter,[13] this paper integrates traditional hydro-pneumatic suspension and hydraulic inerter to design a new type of hydro-pneumatic ISD suspension.[14] The piston of the hydraulic cylinder pushes the fluid into the helical channel and stores a large amount of kinetic energy with the high-speed flowing fluid, amplifying the inertia of fluid. Based on AMESim,[19] a 1/4 hydro-pneumatic ISD suspension is constructed for parameters optimization,[20,21] and a whole vehicle model is established for performance simulation.
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