基于准零刚度隔振器的车-座椅-人耦合模型动态特性研究

Dynamic characteristics of a vehicle-seat-human coupled model with quasi-zero-stiffness isolators

准零刚度隔振器能克服线性被动隔振器中存在的降低固有频率与提高承载力之间的矛盾,将准零刚度隔振器运用到汽车座椅的隔振中,建立了考虑准零刚度隔振器的8自由度车-座椅-人耦合动力学模型,采用数值法分析了此耦合动力学模型在受到路面冲击激励及随机激励下的动态特性。结果表明,当采用准零刚度隔振器作为汽车座椅悬架时,整车乘坐舒适性得到有效改善,汽车悬架行程及座椅行程在允许的行程取值范围内。研究内容对将准零刚度隔振器设计成汽车座椅悬架具有理论指导意义。

The contradiction between lowering natural frequencies and increasing load-bearing capacity existing in linear passive isolators can be overcome with quasi-zero-stiffness isolators.Here,quasi-zero-stiffness isolators were used for vehicle seat isolation.A vehicle-seat-human coupled model of 8-DOF considering quasi-zero-stiffness isolators was established.The dynamic characteristics of this coupled dynamic model under road shock excitation and random excitation were analyzed by using the numerical method.The results showed that when taking a quasi-zero-stiffness isolator as seat suspension,the vehicle ride comfort can be improved effectively,the vehicle suspension stroke and seat stroke are in the allowed stroke range.The study results provided a theoretical guidance for designing quasi-zero-stiffness isolators as seat suspensions.