Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In order to improve the energy harvesting efficiency of the energy harvesting system at low windspeed range , a nonlinear dynamic magnet is introduced into the galloping energy harvesting system.A pairof magnets with opposite magnetic poles are installed at the end of the cantilever beam and the fixture,respectively.A dynamic magnet is connected to the base through a spring and it can move vertically withthe change of the magnetic repulsion force. Firstly , based on the energy method , the multi-field coupledvibration governing equation of dynamic magnetically coupled galloping energy harvesting system ( DM-GEH) is established. Next , the voltage outputs of the DM-GEH and the fixed magnetically coupled gallo-ping energy harvesting system ( FM-GEH ) under low wind speed are compared and analyzed by theRunge-Kutta method.Compared to the that of FM-CEH, the cut-in wind speed of the DM-GEH system is reduced by 81.82% , and the energy harvesting efficiency is increased by 124.22% in the wind speedrange of 1 m/s-5 m/s.Finally , the parameter of the spring support stiffness is optimized to improve theenergy harvesting eficiency at low wind speed. By changing the stiffness of elastic support , the vibrationfrequency will be varied and the cut-in wind speed of the system will be reduced.Compared to that of theDM-GEH with the spring stiffness of 1 000 N/m, the cut-in wind speed of the DM-CEH with the springstiffness of 500 N/m will be reduced by 54.55% , and the energy harvesting efficiency will be increased by15.35%.
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