振动系统中磁流变流体阻尼模型的研究

研究了磁流体的阻尼力特性,提出了基于粘性阻尼和回滞阻尼组成的迟滞阻尼力模型,进行了磁流变阻尼器阻尼力的响应谱分析,并用Newmark数值积分方法分析了带有磁流变流体阻尼器梁结构的多自由度振动系统在不同磁场强度和激励频率作用下的位移响应.结果表明:迟滞阻尼力模型能够很好地描述磁流体阻尼器的力学性能,而且形式简单,概念明确,适合实际应用.

Study on model of magnetorheological fluid damper in vibration systems

Damping force properties of magnetorheological fluid are experimented and the viscous and bilinear hysteresis damping model is presented. The analysis of response frequency spectrum with MR damper is discuses and the numerical results of a beam structure with MR damper are given under different strength of applied external magnetic field and under excitation with different frequencies. The Newmark method is also used to perform the numerical integration with the same parameters as that of the SDOF system. Study results show that hysteresis damping model can describe the mechanical behavior of magnetorheological damper perfectly and it is simple in form, explicit in concent and easy to apply.