Study on damping control for vibration isolation and its application

The damping of vibration isolator plays a significant role in the progress of vibration isolation design. The appropriate damping will significantly suppress the resonance response of the system at the resonant frequency, while the existence of damping will increase the vibration transmissibility in the vibration isolation working area. Therefore, it could meet both the requirement of vibration isolation and amplitude control in the resonance region when the damping of the system could be controlled with the change of frequency. In this paper a new type of controllable damping isolator is presented, i.e. the damping will be as large as possible in order to suppress the vibration near the resonance region when the disturbance frequency is below √2 times of isolator natural frequency, and as small as possible in order to obtain a better isolation effect when the frequency is over √2 times of isolator natural frequency. An increment of 5dB could be obtained in the vibration isolation while the resonance is restrained effectively by adopting this designing technology.