EXPERIMENTAL INVESTIGATION ON THE DYNAMIC BEHAVIOUR OF A DISK-TYPE DAMPER BASED ON MAGNETO-RHEOLOGICAL GREASE

摘要

In order to greatly reduce the effect sedimentation in magneto-rheological fluids ( MRF), which will result in variable-time dynamic behavior of MRF based vibration damping devices, a kind of magneto-rheological greases (MRG), whose rheological property can also be significantly changed on the application of an external magnetic field, is presented, and a MRG based disk-type damper in shear operation for rotational machinery is developed. This paper reports the experimental results about the controllability of the disk-type MRG damper on the dynamic behaviour of a rotor system, the effectiveness of the disk-type MRG damper for attenuating the rotor' s vibration and the suitability of the MRG damper for a feedback vibration control of rotor systems in a flexible rotor. It is shown that the dynamic behaviour of the disk-type MRG damper can be controlled on the application of an external magnetic field produced by a low voltage electromagnetic coil. The disk-type MRG damper can significantly change the dynamic characteristics of a rotor system, and is suitable for an actuator to actively control the vibration of rotor systems.