500kN足尺磁流变液阻尼器设计的关键技术

Crucial techniques for design of 500 kN large-scale MR damper

对我们制作的、目前出力居世界前列的500kN足尺MR阻尼器设计的关键技术、阻尼器的性能试验及力学模型的参数识别进行了研究。在对磁流变液材料的最大屈服剪应力、抗沉降稳定性以及磁滞响应时间等关键性能试验分析的基础上,确认该磁流变液的抗沉降稳定性和其他两项性能指标满足MR阻尼器的设计与工程应用要求。同时,对此500kN足尺MR阻尼器设计的关键技术,包括内置式碟型弹簧蓄能器、磁场防漏设计以及引线保护等进行了介绍;并通过对此MR阻尼器性能的试验,依据阻尼最小二乘法,对MR阻尼器采用的修正的B ingham模型的参数进行了识别,得到了与试验结果吻合的MR阻尼器的力学模型。通过研究可知,高性能磁流变液材料的制备以及MR阻尼器设计的关键技术是大吨位足尺MR阻尼器成功的关键。

The crucial techniques, performance test and model parameters identification of 500kN large-scale magnetorheological （MR） damper with large damping force are reported. On the basis of the key characteristics test of MR fluid, including maximum yield shear stress, sedimentation-proof stability and response time, the sedimentation-proof stability of MR fluid is confirmed, and the other two performance indexes meet the requirements of the design and application of large-scale MR damper. Then several crucial techniques of 500kN large-scale MR damper, including inner disk spring accumulator, magnetic-flux leakage preventing design and leading wire protection are introduced. According to the performance test results of the MR damper, the modified Bingham model parameters of MR damper are identified using damping least square method, and the theoretical results agree well with the experimental ones. Research results demonstrate that it is very important to prepare the high-performance MR fluid and adopt the proposed crucial technologies for the fabrication of large-scale MR damper.