挤压式磁流变弹性体阻尼器力学性能测试与分析

磁流变弹性体是一种由铁磁颗粒和凝胶混合而成的可控智能材料。这种弹性材料的最大的优点是颗粒不会随时间而沉降,也不需要密封装置。研制了几种还原铁粉制备的磁流变弹性体,并设计了一种挤压式磁流变弹性体阻尼器,测试在外加磁场条件下弹性体的弹性模量;由弹性模量与磁场强度的关系来分析磁流变弹性体的力学性能随磁场变换的规律,并结合磁流变弹性体阻尼器在转子振动控制上的应用来说明弹性模量的变化对临界转速的影响。

Testing and analysis of mechanical performance of squeeze mode MR elastomer damper

Magneto-rheological(MR) elastomers,mixture of ferromagnetic grains and gel,are a kind of controllable and intelligent materials. The obvious advantages of using MR solid materials are that the particles will not settle down with time and that there is no need to use sealed device.In this paper,a few MR elastomers are prepared from ferromagnetic grains for a squeeze mode MR elastomer damper and the elastic modulus in the external magnetic field is tested.The rules of mechanical performance of the MR elastomers changing with the magnetic field are analysed based on the relation between the elastic modulus and magnetic field.At the same time, with the application of the MR elastomer damper to a rotor system,the influence of the change of elastic modulus on critical rotational speed of the rotor system is illustrated.