Abstract
The aim of this study is to examine the strongly coupled Fluid-Structure Interaction approach as a comprehensive method of predicting the performance of the shock absorber piston valve. For this purpose, numerical simulation sand experimental testing are carried out. The coupled CFD-FEA numerical model described in this article, contrary to the attempts made so far, takes into account the influence of contact between valve discs and the initial conditions of the disc stack preload. The model is based on the actual valve geometry used in the shock absorber design. As a result, the described approach is intended for use in industrial applications in development works, in particular, at the conceptual stage. To prove the reliability of the model, two valve compositions are chosen to be measured on a test bench and modelled in FSI simulations. For both of them, a satisfactory level of correlation is achieved, with the correlation error below 10% and well-predicted valve opening points. As a result, it is proved that the 2- way FSI approach has great potential to be successfully used to investigate the damper valve operation.
Highlights
It is responsible for comfort, safety and car handling, which are ensured by controlled generation of the damping force-dissipating energy cumulated in a suspension spring
Economy and mid-class cars are usually equipped with passive dampers, while premium-class cars may have semi-active or dynamically adjusting complex systems, which respond to the road profile adequately
The aim of this study is to develop a comprehensive modelling method, making it possible to calculate a variety of stack compositions and capture the impact of 3D geometric features without having to introduce excessive changes in the fluid–structure interaction (FSI) model configuration
Summary
The shock absorber is a crucial part in the car suspension system It is responsible for comfort, safety and car handling, which are ensured by controlled generation of the damping force-dissipating energy cumulated in a suspension spring. Even in the most advanced systems, passive pressure-flow characteristics are pre-set by passive valves. All commonly used passive shock absorber valves are based on a similar working principle. They consist of a piston with passages (channels) that moves forth and back in a pipe filled with viscous oil. The piston passages are covered with a set of metal discs, restricting the flow between the oil chambers. Flow restrictions generate friction within the oil, which is dissipated in the form of heat into the environment.
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