Abstract
In this study, a variable shock absorber (VSA) for semi-active suspension is developed, the structure and operation principle of the VSA is illustrated. Based on the theory of hydraulics and elasticity, the ways of calculating for the embranchment flow rate and the throttle pressure difference on the series-parallel complex pipe line (SPCPL) are deduced and employed, and the detailed mathematical model of the VSA is established by using the differential equation for annular laminar deformation under uniform load (ALDUUL). The MATLAB/Simulink software is used to simulate the detailed model, and the calculated results agree well with the experimental results. In particular, the influence rules of the bypass groove diameter of the VSA on its damping is analyzed through this model, and the results obtained can technically support the design and performance prediction of the VSA to a certain degree.
Highlights
The research work on vibration suppression system of a vehicle using semi-active suspension has been significantly increased [1,2,3]
Two important conclusions can be found from Fig. 5: One is the F-S curves of three conditions are normal and its distortions are avoided. Another is the damping force at the rebound and compression stroke is almost consistent with experiment results, and the error is minor. It proves that the mathematical model is correct and reliably, which is based on many theories, such as the calculating ways of the embranchment flow rate and the throttle pressure difference on the series-parallel complex pipe line (SPCPL), the equation for annular laminar deformation under uniform load (ALDUUL), pipeline flow, nozzle flow and gap flow
In order to apply the model to engineering design and predict the outer characteristic of the variable shock absorber (VSA), the effect of the bypass groove diameter on damping force is studied when piston is inside the bypass groove
Summary
The research work on vibration suppression system of a vehicle using semi-active suspension has been significantly increased [1,2,3]. With the goal to improve the riding comfort and handling safety, a variable shock absorber (VSA), the core component of semi-active suspension systems, is used to produce variable damping characteristics. The researches about semi-active suspension are made of the VSA mostly focus on control algorithms [11,12,13], and the research and develop ability of the VSA which is used in high-grade cars is weak. The bypass groove diameter effect on the damping force for the VSA is rarely analyzed by researchers. For these reasons, the method of calculating the throttle pressure difference and the embranchment flow rate on the SPCPL is proposed. The bypass groove diameter effect on the damping force for the VSA is analyzed by using the mathematical model as well
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