Engine suspension system optimization method capable of considering dynamic rigidity and damping

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Engine suspension system optimization method capable of considering dynamic rigidity and damping

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JIANG CHAO / ZHAO XUGUANG / FENG ENSHENG / HAN XU

The invention discloses an engine suspension system optimization design method capable of considering the dynamic change of rigidity and damping due to excitation force. The method comprises the following steps: firstly, establishing a dynamics model of an engine suspension system; selecting a sample point in an interval formed by a suspension vertical static rigidity design range and an excitation frequency change range, calculating a dynamic rigidity and damping value corresponding to the sample point, carrying out data fitting, and establishing a prediction model; then, according to a multi-degree-of-freedom vibration theory, obtaining a vibration differential equation of the suspension system; solving the differential equation to obtain the inherent frequency of a six degrees of freedom of the suspension system and corresponding dynamic response, taking an integral sum of vibration transmissibility in a vertical direction on the centroid within a vibration frequency range as an optimization target, selecting four suspension vertical static rigidity values as optimization design variables, and taking the inherent frequency of the six degrees of freedom of the suspension system as a constraint condition; adopting a genetic algorithm to carry out optimization; and finally, verifying the feasibility of the method through a specific example. The engine suspension system optimization design method has integrity and practicality.