Abstract: The vibration active control of piezoelectric smart constrained layer damping technology was researched with a clamped-clamped plate structure. The modal active control model was established based on piezoelectric constitutive relation, GHM damping model and modal theory. The modal state observer was designed based on separation theorem since the modal coordinates can not be directly acquired by physical sensor in engineering practice. An active vibration controller was also designed using non-coupling modal control and quadratic optimal control. Experiments of hardware in the loop and active vibration control were carried out under different external disturbance excitations. Results show that, using modal controller with an observer, good effect of active control of the plate vibration can be obtained. When the external excitation is complicated periodic signal, the vibration response amplitude attenuates to nearly 60%. When the external excitation is random white noise, the root mean square value of the vibration response reduces by 9.48%.

Key words: vehicle engineering, smart constrained layer damping, active vibration control, modal control, state observer