基于钢轨吸振器的多模态复合式俘能器性能研究

针对现有的轨道振动俘能器效率低的问题,设计了一种钢轨吸振器和多模态压电电磁复合式俘能器结合的复合吸振器,在有效减轻轮轨系统振动的前提下回收振动能量,为低能耗轨旁设备供电.建立了车轮钢轨复合吸振器系统的摩擦耦合振动模型,与现场实测数据进行对比验证了模型的正确性.在此基础上,分析了多模态复合式俘能模块对轮轨系统振动特性的影...

Research on Characteristics of Multi-mode Composite Energy Harvesters Based on Rail Vibration Absorber

In view of the low efficiency of rail vibration energy harvesters, a composite vibration absorber was designed herein, which made rail vibration absorber coupled with multi-mode piezoelectric-electromagnetic composite energy harvesters. On the premise of effectively reducing the vibration of wheel rail systems, the new device might collect rail vibration energy and power trackside equipment with low energy consumption. A friction coupling vibration model of wheel-rail-composite vibration absorber systems was established. The correctness of the model was verified by comparing with the field measured data. Based on this vibration model, the influences of multi-mode composite energy harvesting modules on vibration characteristics of wheel-rail systems were analyzed. And the power generation performance of the device was studied by using sequential coupling method and parametric analysis method. Analysis results show that the vibration intensity of wheel-rail systems may be reduced effectively by the composite vibration absorber. In the range of 0~600 Hz，the frequency band of vibration energy harvesting may be broaden effectively by the multi-mode piezoelectric-electromagnetic composite energy harvesting modules, and the energy harvesting efficiency is improved. The maximum output power reaches 8.78 mW. The energy harvesting efficiency may be improved by adjusting the structural parameters of energy harvesting modules and improving the strain energy of cantilever beams.