摘要
根据磁流变液装置设计和材料性能评价的需要,分析了磁流变液的流变学特性描述模型:在不同温度和磁场下,磁流变液的剪切应力与剪切应变率之间的关系。为实现磁流变液的高剪切率和高磁场强度,提出一种基于双边圆筒剪切模式的磁流变液流变特性检测方法,利用磁流变液剪切流动平衡微分方程和边界条件,研究了通道中磁流变液标称剪切应力与传递力矩之间的理论关系,标称剪切应变率与转子角速度之间的理论关系,并给出相应的算法,实验得到剪切通道中磁感应强度与励磁电流的关系。合理选择了扭矩传感器、转速测量仪、温度测试仪和电流计等,研制出磁流变液测试仪器,通道磁感应强度超过了6 000 Gs,剪切率超过了1 000 s-1。对某种牌号的磁流变液测试,并与重庆大学工程力学系测试结果能够良好吻合。
On the basis of technical requirements in the development of magnnetorheological （MR） fluid devices and in the evaluation of MR fluid materials, several constitutive models of MR fluid rheological properties are comprehensively analyzed, in which MR fluid constitutive models are expressed as a function of shear stress versus shear rate under the conditions of both special magnetic induction and special temperature. A test methodology based on double rotational coaxial cylinder shear mode is presented to realize high shear rate and high magnetic field. Based on the differential equation and its rational boundary conditions from analyzing stress equilibrium of MR fluid micro-unit, the theoretical relationship between nominal shear stress and transmission torques is analytically established, the theoretical relationship between nominal shear strain rate and rotor angular velocity is also comprehensively established, and corresponding algorithms are worked out. The relationship between average value of magnetic indication in the annular channels and excitation electrical currents are experimentally obtained. A rheometer is fabricated, in which the torque sensor, angular velocity sensor, infrared temperature sensor and ampere meter are reasonably selected. The rheometer was used to test the theological parameters of certain MR fluid and the test results are in good agreement with those obtained by Department of Engineering, Chongqing University.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2008年第12期2475-2479,共5页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(60674097
60574074)
国家863计划(2006AA03Z104)资助项目
关键词
磁流变液
流变学特性
检测方法
magnnetorheological （MR） fluid
rheological property
test methodology
