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相对于参数模型和非参数模型,磁流变阻尼器的物理模型不需要通过实验数据进行参数识别,能够直接从物理实质上预测阻尼器的静态、动态性能,因而一直被用于磁流变阻尼器的设计和分析。为了简化问题,以往的物理模型往往都忽略了液体的惯性力。该文给出了一种简单、高效的建立可考虑液体惯性力的磁流变阻尼器瞬态有限元模型的方法。该方法的要点是:采用动网格技术来描述屈服前区厚度的发展,仅对屈服后区建立有限元模型,而把质量守恒方程和屈服前区的动力学方程作为模型的约束条件。该方法避开了在建立阻尼器瞬态有限元模型时,由粘度突变、屈服点位置依赖于阻尼力等带来的困难。与准静态模型的结果比较表明,该方法正确。结果还表明,磁场的响应是影响磁流变阻尼器瞬态阻尼力的关键,惯性力的影响很小。
Compared with the parametric model and the non-parametric model, the physical model of magnetorheological damper does not need parameter identification through experimental data, and can directly predict the static and dynamic performance of the damper directly from the physical, and thus has been used in magnetorheological damping The design and analysis of the device. In order to simplify the problem, the previous physical model often neglected the inertia of the liquid. In this paper, a simple and efficient method of establishing a transient finite element model of magnetorheological damper that can consider the inertial force of liquid is given. The main points of the method are as follows: The dynamic grid technique is used to describe the development of the pre-yield zone thickness, and only the finite element model is established after the yield zone. The mass conservation equation and the dynamic equation before yield zone are used as the constraints of the model. This method avoids the difficulties caused by the sudden change in viscosity and the dependence of the yield point on the damping force in the establishment of the transient finite element model of the damper. The comparison with the quasi-static model shows that the method is correct. The results also show that the response of the magnetic field is the key to the transient damping force of MR damper, and the influence of inertial force is small.