A magnetorheological damper (MRD) with simple structure and capable of collecting vibration energy was designed to address the over-dependence of MR damper on external power sources and avoid the power failure risk. The damper consisted of a vibration reduction device based on magnetorheological effect and a power generation device based on electromagnetic induction principle. Firstly, the mathematical model of vibration energy harvesting of the power generation device was established based on the Ohm theorem of magnetic circuit. Secondly, MATLAB software was used to analyze the power generation performance. The relationship between the power generation performance and the structural design variables was studied. Then, electromagnetic simulation analysis and comparison were conducted on two power generation devices with different permanent magnet group structures using COMSOL software, with a focus on the impact of permanent magnet group height on power generation performance. Finally, the impact of different vibration frequencies and amplitudes on the power generation performance of the device was simulated and analyzed. The results showed that within a certain range, the height of winding slot of induction coil was basically linear with the power generation performance index, and there were optimal values for the height of permanent magnet group, the height of magnetic gasket and radial thickness of winding cylinder. Regardless of the frequency or amplitude of vibration excitation. The peak induced voltage of a single coil of generation device with a permanent magnet group height of 30 mm was about 42.5% larger than that with a permanent magnet group height of 20 mm, and the peak output power was about 22.3% higher. The research results can provide reference for improving the power generation performance of vibration energy harvesting MRD.
Xingsheng XI,Guoliang HU,Wencai ZHU,Lifan YU,Gang LI. Research on power generation performance of vibration energy collecting magnetorheological damper. Chinese Journal of Engineering Design, 2024, 31(2): 201-209.
Fig.1 Schematic diagram of vibration energy harvesting type MRD structure
Fig.2 Schematic diagram of magnetic circuit of MRD electromagnetic induction power generation device
Fig.3 Relationship between comparison factor Q and height of winding groove wc
Fig.4 Relationship between comparison factor Q and radial thickness lt of winding drum
Fig.5 Relationship between comparison factor Q and height of permanent magnet group τm and height of magnetic gasket τc
Fig.6 Relationship between comparison factor Q and radial thickness of winding cylinder lt, height of magnetic gasket τc
Fig.7 Schematic diagram of two different structures of magnetorheological dampers for power generation devices
Fig.8 Grid division diagram of single coil structure in power generation device
Fig.9 Cloud map of magnetic induction intensity distribution of power generation device at initial position
Fig.10 Variation curve of induced voltage of single coil in power generation device over time
Fig.11 Magnetic induction intensity of induction coil in power generation device
Fig.12 Variation curve of output power of single coil in power generation device over time
Fig.13 Variation curve of induced voltage of single coil in power generation device over time at different frequencies with amplitude of 5 mm
Fig.14 Variation curve of induced voltage of single coil in device over time at different frequencies with amplitude of 10 mm
Fig.15 Variation curve of induced voltage of single coil in device over time at different frequencies with amplitude of 15 mm
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