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设计了磁流变减振器磁芯磁路,建立了磁路的仿真模型,仿真研究了磁路的磁场特性,用实验的方法对仿真模型进行了验证和修正;在此基础上,建立了整个磁流变减振器的仿真模型,仿真研究了其磁场分布规律及不同参数下阻尼孔附近的磁通密度。研究结果表明,磁芯直径、工作缸壁厚、阻尼通道长度和线圈电流是影响磁场特性的主要因素,合理选择磁路结构参数可使其性能得到最大发挥。设计并制造出一种车辆单筒充气式磁流变减振器,对其进行了台架试验,得到不同电流下的减振器示功特性图,研究发现,通过调节减振器励磁线圈中的电流获得不同强度的磁场,在磁场作用下,磁流变液粘度发生变化,从而改变减振器的阻尼特性,减振器的饱和工作电流约为2 A。试验验证了磁路设计的正确性,并为实现车辆磁流变半主动空气悬架控制研究奠定了基础。
The magnetic circuit of MR damper was designed, the simulation model of magnetic circuit was established, the magnetic properties of magnetic circuit were simulated, and the simulation model was verified and corrected by experimental method. On this basis, The whole simulation model of MR damper is simulated and its magnetic field distribution and magnetic flux density near the damping hole under different parameters are simulated. The results show that the core diameter, cylinder wall thickness, damping channel length and coil current are the main factors affecting the magnetic field characteristics. The reasonable choice of magnetic circuit structure parameters can maximize its performance. A kind of vehicle single cylinder inflatable magnetorheological damper was designed and manufactured. The bench test was carried out on the single-tube inflatable magnetorheological damper, and the dynamical performance diagram of the absorber under different currents was obtained. It was found that by adjusting the shock absorber coil Of the current to obtain different strength magnetic field, the magnetic field, the viscosity of the magnetorheological fluid changes, thereby changing the damping characteristics of the damper, the absorber saturation current is about 2 A. The test verifies the correctness of the magnetic circuit design and lays the foundation for the research on the control of the magnetorheological semi-active air suspension of a vehicle.