基于流固耦合的汽车双筒式减振器动态特性研究

Dynamic Characteristics Analysis of Automobile Twin-Tube Damper Based on Fluid-Solid Coupling

对双筒阀片充气式液压减振器内部结构进行建模,建立了减振器复原行程阻尼力数学模型,明确了活塞杆直径、复原阀片外半径以及气室充入气体的压强为影响阻尼力的3个关键参数,理论分析了结构参数对复原行程阻尼力的影响。利用动网格技术对减振器复原行程的内部流场进行了三维数值模拟,得到了流固耦合下阀片的运动状态、流场的压力云图和速度矢量图等,详细分析了各结构参数对复原阻尼力的影响,验证了减振器工作状态中的油液流动情况及所提出方法的可操作性。

The internal structure of double-cylinder hydraulic damper is modeled and the mathematical model of damping force during recovery stroke is established,3 key parameters of the piston rod diameter,outer radius of recovery valve and gas pressure injected into the chamber are defined,these are affecting damping force.Theoretical analysis is carried out for the influence of structural parameters on recovery damping force.The internal flow field of recovery stroke is simulated in 3D model by using dynamic mesh technology to obtain the motion state of the valve under the fluid-solid coupling,the pressure filed cloud map and velocity vector diagram.The influence of various structural parameters on recovery damping force is analyzed in details to validate the damper oil flow under working state and the operability of the proposed method.