Parameterization Research On The Harnessed Energy Of Nonlinear Oscillators With Passive Controls In Fluid Induced Motion

Energy Harvesting?EH?can provide additional energy for UAVs and MAVs to improve their operating time.Flow-induced Motion?FIM?are now considered as one of the most promising and potential sources of energy,which is completely feasible as the backup energy source of micro-spacecraft.In this research,based on the parameterization research on the harnessed energy of nonlinear oscillators with passive controls in fluid induced motion,the relationship between the minimum start-up velocity,power and efficiency,system parameters and the energy optimization area are analyzed.The linear single oscillator,multiple oscillator,nonlinear single oscillator and nonlinear multiple oscillator devices of the energy storage device with virtual spring damping system?Vck?are tested and studied,and the energy collection power and efficiency are compared.The research content and innovative results of this paper are listed as follows:?1?The harnessed energy of single isolated cylinder are studied by considering the influence of amplitude response A/D,frequency responsef_{os c},mass ratio^*m,damping ratio?,stiffness K,etc.on the power and efficiency of the system.The relationship between the optimal region of energy collection power,the optimal region of efficiency and the system parameters is studied,and the applicable velocity range is analyzed.?2?Based on the result of linear single isolated oscillator,the tandem placed oscillator system is analyzed.The spacing ratio L/D and the influence of other system parameters mentioned above are studied,and the spring stiffness,damping ratio and other parameters of upper and lower cylinder are also analyzed respectively.The optimized region is studied and compared with the linear oscillator,the power is increased by more than two times.?3?Nonlinear oscillator system is studied.Vck virtual spring damping system has realized the adaptive damping adjustment,and compared with the linear oscillator.The nonlinear oscillator's efficiency in galloping increased by 76%at the beginning,through the analysis of spring stiffness,damping ratio and frequency response of parameters.But with the increase of flow velocity,the gap is down to 15%.?4?The adaptive damping is introduced into the tandem cylinders system,and the speed-proportional adaptive damping coefficient is used.The negative shielding effect of the upstream cylinder is overcome partially.Compared to the linear system,the energy harnessing power and efficiency are significantly improved.