Vibration control of flexible structures using newly developed servo-sensor

Proposes a vibration control method for flexible structures using a servo-type vibration sensor which can measure both signals of velocity and displacement simultaneously under low frequency range. For controlling the vibration of flexible structures, it is necessary to measure velocity and displacement signals of these structures. When the structure is taller, its natural frequency is lower, and hence it is required to construct the sensor with a lower frequency of measuring range. The proposed sensor uses a positive feedback of the relative displacement for reducing its natural frequency actively. Therefore, the sensor with light mass and hard spring can be constructed for realizing this requirement. The effectiveness of the proposed sensor is demonstrated by both the simulation and experimental studies of controlling the vibration of a scaled bridge tower structure with a low natural frequency