CAJ | 학술논문

利用线性压磁方程和欧拉‐伯努利方程建立了基于Galfenol （Fe‐Ga合金）驱动器的动力学模型，在变频率条件下，驱动磁场存在扩散效应，直接影响模型对于驱动器动态特性的预测。为解决普通梯度算法无法收敛的问题，提出了一种基于遗传算法的动力学模型参数辨识方法，无需满足持续激励条件，可对变频率条件下驱动器的压磁系数和阻尼系数进行辨识。计算结果表明，辨识算法收敛性好，经过7次迭代以后即可寻找到最优值。同时进行了对比实验，结果显示驱动频率低于220 H z时模型参数变化较小，更高驱动频率时模型参数发生较大的变化。利用该方法可以在变频率条件下准确掌握驱动器结构参数的变化，为Gal‐fenol驱动器磁路的设计与控制提供理论指导。
이용선성압자방정화구랍‐백노리방정건립료기우Galfenol （Fe‐Ga합금）구동기적동역학모형，재변빈솔조건하，구동자장존재확산효응，직접영향모형대우구동기동태특성적예측。위해결보통제도산법무법수렴적문제，제출료일충기우유전산법적동역학모형삼수변식방법，무수만족지속격려조건，가대변빈솔조건하구동기적압자계수화조니계수진행변식。계산결과표명，변식산법수렴성호，경과7차질대이후즉가심조도최우치。동시진행료대비실험，결과현시구동빈솔저우220 H z시모형삼수변화교소，경고구동빈솔시모형삼수발생교대적변화。이용해방법가이재변빈솔조건하준학장악구동기결구삼수적변화，위Gal‐fenol구동기자로적설계여공제제공이론지도。
A dynamic model of Galfenol actuator is developed by using a linear piezomagnetic equation and the Euler‐Bernoulli equation .The magnitude and the phase of the excitation field demonstrate the diffusion effect in the magnetic circuit due to the existence of the dynamic eddy current loss .The model prediction of the flexible beam can be directly affected by the influence of the eddy current loss .A genetic algorithm is proposed to identi‐fy the parameters of the model ,for which the persistent excitation condition is not needed .The piezo‐coefficient and the damping constant are identified at different dynamic frequencies .Simulation results show that the pro‐posed method achieves good convergence performance that the optimal model parameters can be found after sev‐eral iterations .Experimental results show that the variations of the model parameters are small w hen the excit‐ing frequency was low (less than 220 Hz) .Larger variations happen when higher frequencies are applied .The changes of the model parameters according to the eddy current loss at different frequencies can be effectively de‐scribed by the method ,w hich can be used for design and control of the Galfenol flexible structure .