| Vehicle ISD is short for a novel suspension composed of "Inerter-Spring-Damper",which brings the inerter into suspension system,breaks the traditional suspension structure composed of "Spring-Damper",and offers a new way for the study of suspension vibration control.Currently,controllable ISD suspension is a new hot spot research in this field,but it is still in the stage of the semi-active tunning of element parameters rather than active coordination control combined with complex dynamic characteristics of ISD suspension.Based on this point,this paper develops a hydro-electric coupling ISD suspension system,accumulating valuable theoretical and practical experience for the controllable ISD suspension research.First,in view of the ISD suspension structure,according to new mechanical and electrical analogy theory and impedance characteristics of series and parallel structure,through studying the vibration transmission characteristics of single-degree-freedom two-element structure,a structure with excellent vibration isolation effect was determined as basic structure.The new kind of hydroelectric coupling inerter was designed and developed and the mathematical model was deduced.The performance test was conduct on the INSTRON 8800 single-channel CNC servo vibration platform,verifying the correctness of the model.Based on the basic structure and the hydroelectric coupling inerter,one-quarter hydro-electric coupling ISD suspension system was built.With the coupling influences of suspension element parameters on the frequency domain analyzed,the effect law and working mechanism of performances on ISD suspension was further revealed.Secondly,based on the single neuron theory,the single neuron PID control system of hydroelectric coupling ISD suspension was designed with target of body acceleration.Contraposing the problem of the influences of learning speed in weighted coefficients and proportionality coefficient in output on control quality in control algorithm,multi-objective genetic optimization algorithm was applied to optimize control parameters.Compared with traditional passive suspension in the simulation analysis,the results showed that: in the condition of random road input,RMS of body acceleration and suspension dynamic deflection of hydro-electric coupling ISD suspension were both reduced to some extent.In the condition of changing spring mass and tire fitness,the hydroelectric coupling ISD suspension could maintain the original control effect.In the condition of pulse pavement input,the hydro-electric coupling ISD suspension effectively suppressed the peak vibration.The excellent performance and control robustness of the hydro-electric coupling ISD suspension were verified.Finally,one-quarter hydro-electric coupling ISD suspension was built on the vibration platform,and the semi-physical simulation test was carried out with real-time simulation system based on dSPACE adopted.The experimental results showed that,in the condition of different sine input,RMS of body acceleration and suspension dynamic deflection of the hydro-electric coupling ISD suspension was less than traditional passive suspension.In the condition of random input,when the vehicle speed was 10m/s,20m/s and 30m/s respectively,RMS of the body acceleration were decreased by 10.75%,10.87% and 8.47%,respectively.RMS of the suspension dynamic deflection were decreased by 15.56%,13.75% and 11.30%,respectively.The experimental results is consistent with the simulation results,and further verifys the good riding comfort of the hydroelectric coupling ISD suspension.Through the research of this paper,the coupling effect of ISD suspension parameters on the suspension property in the frequency domain is revealed.The hydro-electric coupling inerter provides a new way for the realization of controllable ISD suspension.The paper designs the single neuron PID controller of hydro-electric coupling ISD suspension and enriches the control theory and method of controllable ISD suspension.The proposed hydro-electric coupling ISD suspension provides a new way for the study of controllable ISD suspension. |
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