Development of Velocity and Displacement Sensor for Vibration Control

Abstract

This study is concerned with the development of a new type of sensor for vibration control. This sensor belongs to the class of seismo-type. The main features of this sensor compactness, robust against shock and also to measure velocity and displacement simultaneously under the low frequency range. Until now, in order to measure the absolute displacement under low frequencies, the conventional sensor has to be made with its low natural frequency. To realize low natural frequency, sensor must have large mass with soft spring. That is to say, these sensors are big and weak against shock. To solve these problem, the proposed sensor uses positive displacement and negative acceleration feedback for reducing its natural frequency actively. Therefore, it is possible to construct a sensor with light mass and hard spring for realizing the requirement.