**5. Conclusion**

**Figure 7.** Displacement response of the structural system with the MR mount.

98 Advances in Vibration Engineering and Structural Dynamics

**Figure 8.** Acceleration response of the structural system with the MR mount.

In order to implement the LQG controller, an experimental setup is established as shown in Figure 6. The mass supported by the MR mount is excited by the electromagnetic exciter, and the excitation force and frequency are regulated by the exciter controller. Accelerometers are A new type of the mixed-mode MR mount was proposed and applied to vibration control of a flexible beam structure system. On the basis of non-dimensional Bingham number, an appro‐ priate size of the MR mount was designed and manufactured. After experimentally evaluat‐ ing the field-dependent damping force of the MR mount, a structural system consisting of a flexible beam and vibrating rigid mass was established. The governing equation of motion of the system was formulated and a linear quadratic Gaussian (LQG) controller was designed to attenuate the vibration of the structural system. It has been demonstrated through experimen‐ tal realization that the imposed vibrations of the structural system such as acceleration and displacement are favorably reduced by activating the proposed MR mount associated with the optimal controller. The control results presented in this study are quite self-explanatory justi‐ fying that the proposed semi-active MR mount can be effectively utilized to the vibration con‐ trol of various structural systems such as flexible robot arm and satellite appendages.
