During the everyday usage of an automobile, only 10–16% of the fuel energy is used to drive the car — to overcome the resistance from road friction and air drag. One important loss is the dissipation of vibration energy by shock absorbers in the vehicle suspension under the excitation of road irregularity and vehicle acceleration or deceleration. In this paper we design, characterize, and test a retrofit regenerative shock absorber which can efficiently recover the vibration energy in a compact space. Rare-earth permanent magnets and high permeable magnetic loop are used to configure a four-phase linear generator with increased efficiency and reduced weight. Finite element method is used to analyze the magnetic field and guide the design optimization. A theoretical model is created to analyze the waveforms and regenerated energy of the harvester at various vibration amplitudes, frequencies, equilibrium positions, and design parameters. Experimental studies of a 1:2-scale prototype are conducted and the results agree very well with the theoretical predictions.
Design and Characterization of an Electromagnetic Energy Harvester for Vehicle Suspensions
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Scully, B, Zuo, L, Shestani, J, & Zhou, Y. "Design and Characterization of an Electromagnetic Energy Harvester for Vehicle Suspensions." Proceedings of the ASME 2009 International Mechanical Engineering Congress and Exposition. Volume 10: Mechanical Systems and Control, Parts A and B. Lake Buena Vista, Florida, USA. November 13–19, 2009. pp. 1007-1016. ASME. https://doi.org/10.1115/IMECE2009-12091
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