基于数值仿真的RC装置模型参数辨识研究

Study on Parameter Identification of Resonance Changer Based on Numerical SimulationStudy on Parameter Identification of Resonance Changer Based on Numerical Simulation

通过UDF程序将液压油的可压缩性、压力波在液压油中的传播速度和入口压力边界条件考虑进CFD仿真模型中,采用FLUENT软件对RC装置模型中的流体非定常流动进行了数值仿真,在此基础上对其进行模型参数辨识。结果表明:在激振力的频率较低时,RC装置等效动力参数变化很小,与其参数理论计算公式得到的结果能够较好地吻合;但是随着激振力频率的增大,刚度和阻尼将明显增大,理论计算公式将不能适用。

The paper defines the compressibility of the oil, the propagation velocity of pressure wave in the hydraulic oil, and the pressure inlet boundary condition of the model by UDF program. Then, theunsteady flow of the compressibility oil inresonance changer is simulated by using FLUENT, and the identification of its equivalent dynamic parameters is introduced. Analysis shows that when thefrequency of the exciting force is relatively low; parameter variation is very small, which can be well fit with the result obtained by its theoretical calculation formula. As the frequency increases, the stiffness and the damp would increase so greatly that the theoretical calculation formula become improper.