Sensitivity Analysis And Optimization Of Key Parameter Of Hydraulically Interconnected Suspension Based On Morris

The suspension system is one of the most important part of the vehicle. Its performance has a great influence on the vehicle ride-handling stability and comfort performance. Optimizing suspension system and proposing the new suspension forms is becoming a field which the scholars are very interested in. In recent years, Interconnected Suspension is a new field that many scholars are engaging in. Interconnected suspension is the suspension which a motion of the wheel causes the other wheel of the spring force variation. According to the different ways of transferring power, there are different ways of distinguishing interconnected Suspension. It can be divided into pneumatic suspension ? mechanical linkage suspension and hydraulically interconnected suspension. For now, mechanical linkage suspension has been are put on the market, for example,the suspension outfit stabilizer bar. The hydraulically interconnected suspension has the capability to adjust the spring/damping rates for each mode independently. Hence, this suspension has the extensively applied foreground.The paper focus on the frequency domain analysis of an integrated half-car/HIS system on the base of previous studies. And based on the sensitivity analysis called Morris, the paper achieve the degree of the influence of hydraulic system parameters to hydraulically interconnected suspension dynamic response. At last, optimize the hydraulic system parameters of the suspension based on genetic algorithms. The main contents are as follows:(1) Set the mechanical system model and hydraulic components tubing, accumulators and damping valve model. Though those that above-mentioned get the impedance matrix, which depends on the impedance characteristics of the individual fluid system elements. After gaining the mechanical-fluid system boundary conditions, the paper get the coupled equations. Then the paper analysis the coupled equations, obtain the bounce?roll vibration mode;(2) Calculate bounce and roll transfer function when the system has received different incentive. By setting the road frequency domain model, acquiring system frequency response by the road excitation, comparing to the traditional suspension vibration response, the paper get the corresponding results.(3) After the hydraulic system modeling has been set, the paper can determine the hydraulic parameters scope. Sensitivity analysis Morris principle show that the mean and variance of the basic elements of hydraulic system parameters represent the degree of sensitivity and how is the nonlinear interaction of this parameter or the degree of interaction with other parameters. Using Matlab we can achieve the mean and variance of each hydraulic parameter. The obtained results indicate that accumulator and the valves connected to it make a large impact on roll vibration model and valves connected to hydraulic chambers have a large impact on bounce vibration model. This paper provides theoretical basis for suspension optimization.(4) Based on the sensitivity analysis, the paper optimize the hydraulic system parameters of the suspension with vertical and roll acceleration power spectral density function as the target function applying genetic algorithms. At last, the paper get the optimized target curve.