In order to reveal the nonlinearity of the new type of fluid inerter and its impact on vehicle sus-pension performance, a nonlinear dynamic model for fluid inerter is built involving the coupling of inner friction force, parasitic damping force and inertia force. The fluid inerter system is developed and its mechanical perform-ance is tested with its results verifying the effectiveness of theoretical model. On the basis of study on two widely used ISD suspensions, a vibration model for a two-axle vehicle is constructed based on nonlinear fluid inerter to ana-lyze its vibration isolation performance in a condition of random road input. The results show that the vibration isola-tion performances of two suspension systems are both subjected to the effects of nonlinearity of fluid inerter, mainly embodied in the deterioration of vibration isolation performance at low frequency segment. Compared with S2 suspen-sion, the vibration isolation performance of S1 suspension is less affected by nonlinearity, exhibiting better perform-ance superiority.%为揭示新型流体惯容器的非线性因素及其对车辆悬架性能的影响,建立了包含内摩擦力、流体寄生阻尼力和惯性力耦合的流体惯容器非线性动力学模型.研制了流体惯容器系统,进行力学性能测试,试验结果证明了理论模型的有效性.以研究应用较广泛的两种车辆惯容弹簧阻尼(ISD)悬架为基础,搭建了基于非线性流体惯容器的双轴车辆振动模型,在随机路面输入条件下分析其隔振性能,结果表明:两种悬架系统的隔振性能均受到流体惯容器的非线性影响,主要体现在低频段隔振性能的恶化.与S2型悬架相比,S1型悬架的隔振性能受非线性影响较小,表现出较好的性能优势.
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