基于机电类比的线-角振动激振器参数辨识

Parameter Identification of Linear-angular Vibration ExciterBased on Electromechanical Analogy

针对电磁式线-角振动激振器动力学参数难以直接获取的问题,提出一种基于机电类比原理的动力学参数辨识方法,可获取该激振器单轴和耦合振动的动力学参数。首先,介绍了电磁式线-角振动激振器的结构组成及工作原理,并建立激振器单轴振动以及耦合振动的运动微分方程;其次,基于导纳型机电类比原理建立含力学参数的单轴振动以及耦合振动机电类比模型;最后,根据机电类比模型建立含动力学参数的阻抗公式,结合附加质量法得到激振器动力学参数辨识模型,进一步通过数值仿真验证模型有效性,仿真结果表明:该方法具备较高的辨识精度以及抗噪声能力,各参数的辨识相对误差均在5%以内。

Aiming at the problem that the dynamic parameters of the electromagnetic linear-angular vibration exciter are difficult to obtain directly,a dynamic parameter identification method based on the principle of electromechanical analogy is proposed,which can obtain the dynamic parameters of uniaxial and coupling vibration of the exciter.Firstly,the structural and working principle of the electromagnetic linear-angular vibration exciter are introduced,and the motion differential equations of uniaxial vibration and coupling vibration are established.Secondly,based on the admittance electromechanical analogy principle,the electromechanical analogy models of uniaxial vibration and coupled vibration with mechanical parameters are established.Finally,the impedance formula containing dynamic parameters is established according to the electromechanical ratio model,and the dynamic parameter identification model of the exciter is obtained by combining the additional mass method.The validity of the model is further verified by numerical simulation.The simulation results show that this method has high identification accuracy and anti-noise ability,and the identification relative errors of each parameter are within 5%.