Center of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150080, China.
Rev Sci Instrum. 2023 Mar 1;94(3):035006. doi: 10.1063/5.0134290.
The absence of an appropriate low-frequency vibration velocity detection method to establish feedback control limits the further improvement of the low-frequency vibration performance of electromagnetic vibration exciters. In this article, a low-frequency vibration velocity feedback control method based on the Kalman filter estimation is proposed for the first time to reduce the total harmonic distortion of the vibration waveform. The rationality of establishing velocity feedback control in the velocity characteristic band of the electromagnetic vibration exciter is analyzed. Based on an identification model of the system and measured vibration displacements, the vibration velocity is estimated with high accuracy through the Kalman filter. The velocity feedback control system is established to suppress the impacts of disturbances effectively. Experimental results show that the method proposed in this paper can reduce the harmonic distortion of vibration waveform by 40%, which is 20% higher than the traditional control method, thoroughly verifying its superiority.
低频振动速度检测方法的缺失限制了电磁振动激振器低频振动性能的进一步提高。本文首次提出了一种基于卡尔曼滤波估计的低频振动速度反馈控制方法，以降低振动波形的总谐波失真。分析了在电磁振动激振器速度特性带宽内建立速度反馈控制的合理性。基于系统辨识模型和实测振动位移，通过卡尔曼滤波器实现了对振动速度的高精度估计。建立了速度反馈控制系统，有效地抑制了干扰的影响。实验结果表明，本文提出的方法可以将振动波形的谐波失真降低 40%，比传统控制方法提高了 20%，充分验证了其优越性。
