磁流变支座剪切刚度与热损功耗的能效分析

Energy efficiency analysis between shear stiffness and heat loss of magneto-rheological bearing

研究不同材料配比下的热损功耗和可调刚度的复杂关系,对提升叠层型磁流变支座(MRB)的隔减振性能具有重要意义。基于力磁耦合理论,构造分析支座的宏微观力磁耦合模型,进而计算支座磁场分布和水平剪切刚度,并考虑热损功耗的影响,得出支座刚度变化与磁流变橡胶(MRR)颗粒体积比的关系。通过MTS测试机对支座进行剪切测试,所得实验数据与理论计算的结果进行对比分析。结果表明,该支座最大可承受的热损功耗限制在38.7 W时,支座剪切刚度变化为最大且可达42.8%,其最优颗粒体积比为12%,且最优颗粒体积比随热损功耗的变化而发生偏移。该宏微观模型寻找到支座热损功耗与剪切刚度变化率的一种平衡规律,为磁流变橡胶支座进行结构和性能的优化设计提供了新思路。

The study of the complex relationship between heat losses and variable stiffness under different material ratios has important significance to improve the vibration isolation performance of a laminated Magneto-rheological rubber bearing(MRB).Based on magneto-mechanical coupling theory,the macroscopic and microscopic magneto-mechanical coupling models are constructed for the bearing.In further,the magnetic field distribution and stiffness of horizontal shear of the bearing are calculated.Considering the influence of heat losses,the relationship between the range of stiffness and the particle volume ratio of the magneto-rheological rubber(MRR)is obtained.The bearing is sheared on the MTS tester,and the experimental data are compared with the theoretical results.Results show that the designed bearing can obtain the maximum range of stiffness up to 42.8%while the maximum heat loss is limited within 38.7 W,and the optimal particle volume ratio of the MRR is 12%.Besides,the optimal particle volume ratio of the MRR deviates with the changes of heat losses.Therefore,the balance law of heat losses and variable stiffness obtained by this macroscopic and microscopic theory model can provide a novel way to design the optimal structure and properties of MRB.