| The new vibration isolation element inerter has the characteristics of resisting low frequency and passing high frequency.The independent ISD(Inerter-Spring-Damper)suspension can effectively reduce the vertical vibration of the vehicle body in the low frequency range and improve the ride comfort of the vehicle.The comfort evaluation standard shows that the human body is more sensitive to the pitching vibration in the low frequency band.In order to make the ISD suspension further suppress the low-frequency pitch vibration and improve the ride comfort of the vehicle,a longitudinally interconnected ISD suspension structure is proposed in this paper.The suspension structure connects the front and rear suspensions of the vehicle through the inerter to realize the longitudinal interconnection of the ISD suspension.In order to realize the engineering of longitudinally interconnected ISD suspension,a hydraulic inerter and oil-pneumatic spring are integrated,and a longitudinal hydraulically interconnected ISD suspension is proposed and designed.The suspension has simple structure,compact structure,convenient installation,and easy Engineering and other advantages.Firstly,according to the inductance-capacitance(LC)series resonant circuit and the new electromechanical similarity theory,based on the equivalence relationship between the hydraulic ISD suspension and the two-stage series ISD suspension,a variety of vertically interconnected ISD suspension configuration alternatives are proposed.The transfer characteristics of these configurations were analyzed by the impedance method,combined with the realization characteristics of the longitudinal interconnection ISD suspension,considering the configuration,performance and whether it is easy to realize,etc,the optimal configuration was comprehensively screened out for the longitudinal hydraulic interconnection ISD The engineering of the suspension lays the foundation.Secondly,using MATLAB/Simulink to establish the vehicle equivalent mathematical model of the longitudinally interconnected ISD suspension,through the simulation of the amplitude-frequency characteristics of the suspension,random road excitation response and impulse excitation response were compared and analyzed;using AMESim to establish a more in line with the longitudinal hydraulic Interconnect the actual 15-degree-of-freedom physical model of the vehicle with the ISD suspension,set the key parameters of the suspension,and compare and analyze the random road excitation response of the vehicle.The simulation analysis shows that compared with the traditional hydraulic suspension,the longitudinal hydraulic interconnected ISD suspension can suppress the vertical and pitch vibration of the vehicle body and improve the ride comfort of the vehicle.Finally,the designed longitudinal hydraulic interconnected ISD suspension was installed on the vehicle bench test vehicle,and the frequency response characteristics,deviation frequency,pulse and random road input tests were carried out on the MTS four-main column vibration table.The test results show that,compared with the traditional hydraulic suspension,the body bias frequency and low-frequency resonance peak of the longitudinal hydraulic interconnected ISD suspension are significantly reduced,and the low-frequency vibration isolation performance is significantly improved.The test results of pulse excitation,random excitation and frequency response characteristics show that the longitudinal hydraulic interconnection ISD suspension can effectively reduce the vertical and pitch vibration of the vehicle body and tire jump,improve the ride comfort of the vehicle,and improve the grounding performance of the tire. |
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