冲击载荷下磁流变阻尼器结构优化设计

Structural Optimal Design of Megneto-rheological Dampers under Impact Load

应用于火炮反后坐装置中的磁流变阻尼器工作在高冲击、高速环境下,对磁流变阻尼器的设计指标和性能提出了更高的要求。针对冲击试验中,磁流变阻尼器表现出的阻尼力可调动态范围的不足,利用Herschel-Bu lkley的磁流变液非线性结构特性的平行平板恒流模型,采用多目标规划方法,提出了火炮反后坐装置应用中的磁流变阻尼器优化设计方法。最后分析了磁流变阻尼器磁路设计准则,结合优化设计尺寸,对阻尼器活塞磁场进行了有限元分析,结果表明,磁流变阻尼器阻尼通道处能产生足够大的磁场强度且分布均匀。

For recoil mechanical applications, MR dampers are under impact load and high velocities, in this environment, severe performance indices of MR dampers are required. In respect that the dynamic range of the MR dampers in tests are not satisfied, optimal design of MR dampers for gun recoil mechanism applications is put forward based on the non - linear Herschel - Bulkley fluid model by using muhipule objective method. Then the rules of the magnetic circuit design of MR dampers is discussed, and the magnetic field in the piston is analyzed by finite element methods, based on the optimized geometry of MR damper. The results show that the magnetic flux density of the MR fluid gap is large enough and evenly distributed.