电磁式振动能发电机寄生阻尼因数测定新方法

A Novel Determination Method for the Parasitic Damping Factor of Electromagnetic Vibration-based Generators

寄生阻尼因数的确定对基于惯性耦合的谐振式振动能捕获微型发电机的模型求解、性能优化等至关重要。针对电磁式(electromagnetic,EM)振动能发电机,提出利用发电机空载时惯性质量块的阻尼自由衰减振荡过程,采用有限元分析(finite element analysis,FEA)、模型数值求解来获得线圈空载电压的仿真值,将所得仿真值与实验测量结果比对,在最小均方误差(least mean square error,LMSE)准则下确定出寄生阻尼因数的新方法。结果表明,此方法是可行的,且与常规方法相比具有更好的普适性。

The determination of the parasitic damping factor is a vital procedure in model solving and performance optimization for inertial coupling based vibration energy harvesting resonant micro-generators. A novel determination method for the parasitic damping factor was presented for electromagnetic vibration-based generators. According to the damped free decaying oscillations of the inertial mass under no-load condition, the simulated coil voltage was obtained through the finite element analysis （FEA） and numerical solutions of generator models. When comparing the simulated and measured results, the parasitic damping factor could be obtained with the rule of the least-mean-square-error （LMSE）. The experimental results show that the proposed method is feasible, and more practical than the conventional one.