磁流变发动机悬置的参数化建模与辨识

研究频变、磁变效应下的磁流变悬置的力学模型建立问题。以某磁流变悬置为例,根据Bingham模型,将悬置恢复力分为库仑阻尼力、弹性恢复力,黏性阻尼力三部分;通过分析各部分力与频率、磁场的相关性分析,提出一种改进的多项式Bingham参数化模型。该模型以外部电流、外载频率为变量,通过推导外部位移激励的能量耗散、储存关系,提出该多项式模型中九个待识别参数的辨识方法。设计了试验方案,并通过真实试验测试各种工况下该挤压式磁流变悬置的恢复力-位移关系,根据所提方法,得到在不同工况下的磁流变悬置的恢复力随电流、外载频率变化的关系。对比试验结果表明,该参数化模型在动刚度、滞后角以及滞回曲线上能良好地反映悬置的宽频段动力学特性。

Dynamic Parametric Modeling and Identification of Magnetorheological Fluid Engine Mounts

The present work is about the dynamic model and the experimental testing of the magnetorheological fluid(MRF) mounts, especially at wide frequency. A squeeze MRF mounts is adopted, according to Bingham model, the react force of the mounts is divided to three parts which contains coulomb damping force, viscous damping force and elastic force. An advanced polynomial Bingham parameterization model is built by analysing the relationship between the frequency, magnetic field and the each part force. The applied current and the excitation frequency in this model as variable, nine variable parameters of the second order polynomial are found by testing different operating conditions. A verification test shows the reliability and the performance of the proposed model.