基于磁流变弹性体的坦克发动机减振研究

Study on Vibration Reduction of the Tank Engines based on MRE

发动机悬置系统的动静态特性是影响坦克车辆的机动性和人员舒适性的重要因素之一。由于发动机振动频率随着工况的改变而发生改变,利用磁流变弹性体的刚度可控特性,采用避开车身振动频率的方式,提高悬置系统隔振效果。基于建立的发动机两自由度动力学模型,获得避开机身共振频率所需磁流变弹性体悬置系统的刚度变化范围。设计了一种新型的压缩式磁流变弹性体隔振器,用有限元法对隔振器的磁路进行设计和分析,并采用万能材料试验机对该隔振器进行了测试。试验结果表明,通过改变外加电流大小,该隔振器满足了坦克发动机悬置的刚度变化范围。

Static and dynamic characteristic of the engine mounting system is one of the important factors which affect the mobility of the tank vehicles and the soldier’s comfort. Since the engine vibration frequency changes with the condition change, the controllable stiffness characteristic of the MRE can be used to improve the insulation effect of the mounting system by avoiding the vibration frequency of the tank’s body. Based on the 2D engine dynamic model, the variation range of the stiffness of the MRE mounting system can be got by avoiding resonance envelopes of the tank’s body. In this paper, a new compression- type vibration isolator based on the MRE is developed. The magnetic circuit of the isolator is designed and analyzed using finite element method. The isolator is tested in a universal material testing machine. The test results show that with the use of the MRE isolator, the stiffness of the engine mounting system can be limited in the necessary range by adjusting the external current.