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对工程机械驾驶室液阻橡胶隔振器进行低频大振幅激励下液固耦合动力学有限元仿真分析,并通过试验验证有限元模型的合理性。以某挖掘机液阻橡胶隔振器为例,采用ADINA建立其二维1/2液固耦合有限元模型,通过设置Ga p边界条件和定义接触对,较好地模拟阻尼盘和橡胶底部形成的可变间隙对流体流动的作用;获得该隔振器在激振频率为2 Hz,激振振幅为0.5 mm的低频大振幅简谐激励时液体的压力分布、流速分布和固体应力分布等动态特性;通过与仿真分析相同设置的动态试验,验证有限元模型的有效性。所得结论对液阻悬置的设计有指导作用,并可为进一步研究液阻橡胶隔振器动力学模型提供基础。
The finite element simulation of liquid-solid coupling dynamics under low frequency and large amplitude excitation is applied to the hydraulic resistance rubber vibration isolator of construction machinery cab, and the rationality of the finite element model is verified through experiments. Taking an excavator hydraulic rubber vibration isolator as an example, a two-dimensional liquid-solid coupling finite element model of ADINA was established. By setting the Ga p boundary condition and defining the contact pair, the damping plate and rubber bottom were well simulated The effect of variable clearance on the fluid flow is obtained. The pressure distribution, flow velocity distribution and solid stress distribution of the vibration isolator are obtained when the vibration amplitude is 2 Hz and the exciting amplitude is 0.5 mm. The validity of the finite element model is verified by a dynamic test with the same settings as the simulation analysis. The conclusions obtained are helpful to the design of hydraulic resistance suspension and can provide the foundation for further study on the dynamic model of hydraulic isolator.