Identification and analysis of nonlinear dynamics of inertial actuators
Identification and analysis of nonlinear dynamics of inertial actuators
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DOI：
10.1016/j.ymssp.2018.05.044
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发表时间：
2019-01
影响因子：
8.4
通讯作者：
M. Borgo;M. G. Tehrani;S. Elliott
中科院分区：
文献类型：
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作者：
M. Borgo;M. G. Tehrani;S. Elliott
本文对电动式质量块驱动器的非线性动力学进行了实验研究。当惯性作动器用于速度反馈控制器时，它们的非线性动态特性会影响反馈回路的稳定裕度。因此，识别非线性源并建立可用于稳定性分析的可靠模型至关重要。首先，针对小激励信号，辨识惯性作动器的基本线性模型参数。在高频下由于涡流引起的电感损耗也被包括在电阻抗模型中。其次，惯性作动器的非线性模型的确定使用的检测，表征和识别过程。最后，进行了数值分析，以突出惯性执行器的非线性动力学的影响。所提出的方法被应用到几个电磁检测质量致动器，包括当检测质量是不可访问的直接仪表。
This paper presents an experimental study of the nonlinear dynamics of electrodynamic proof mass actuators. When inertial actuators are used in velocity feedback controllers, their nonlinear dynamics can affect the stability margin of the feedback loop. Thus, it is crucial to identify the nonlinearity sources and to build reliable models that can be implemented in the stability analysis. Firstly, the underlying linear model parameters of an inertial actuator are identified for small excitation signals. The inductance losses at high frequencies due to eddy currents have also been included in the electrical impedance model. Secondly, the nonlinear model of the inertial actuator is determined using the detection, characterisation and identification process. Finally, a numerical analysis is carried out to highlight the implications of nonlinear dynamics of inertial actuators. The proposed methodology is applied to several electromagnetic proof mass actuators, including when the proof mass is not accessible to be directly instrumented.