On the extraction technique of the single-coil self-feedback signal on a standard vibration table

In the process of calibration on vibration and shock transducers, it is necessary for the vibration table to generate a small sine-function form distortion as the excitation signal, and the closed-loop servo feedback technology is one of the proven effective ways to reduce low-frequency motion signal distortion of the vibration table. In this paper, we report a method based on the principle of closed-loop servo feedback that can directly extract induction electromotive force of the vibrator coil. This method solves the problems caused by using sensors in the process of getting the vibration signals. Furthermore, this device has some advantages such as small size, light weight, low cost and simple maintenance. In this article, the system components and technical indexes and analyzis of the control method of the vibration table are described. Next, we compare the wave distortion obtained using monocoil signal extraction technology and that obtained using relative speed sensor. Finally, the error analysis of...