Multi-model vibration control of laminated composites plates for various fiver orientations has been carried out by making use of piezolectric materials(PZT) as sensors and actuators. Cantilever plate is used as a specimen to test multi-modal vibration supression under random exitation. Impulse technique is applied to determine the natural frequency, the damping ratio(.zeta.) and the modal damping(2.zeta..omega.) of the first bending and the trosion modes. Two independent controllers are implemented to control the two modes simultaneously and established digitally on the basis of the direct negative velocity feedback control with collocated sensor/actuator. Experimental results for various fiber orientations and feedback gains are compared with finite element analysis considering stiffnesses and dampings of piezoeletiric sensors, actuators and bonding layer.
Ju, Hyeong-Dal ; Park, Hyeon-Cheol ; Hwang, Un-Bong 2000. "Multi-Modal Vibration Control of Truss Structures Using Piezoelectric Actuators" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 24(10): 2502~2512
2001. "Vibration Control of Smart Laminated Composite Plates Using Piezoceramic Sensor/Actuators and Viscoelastic Material" 한국소음진동공학회논문집 = Transactions of the Korean society for noise and vibration engineering, 11(4): 37~42
Chae, Jang-Su ; Park, Tae-Won 2002. "H∞ Controller Design of Flexible Space Structure with the Uncertainty of Damping Ratio" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 26(4): 602~608
Goo Nam-Seo ; Woo Sung-Choong 2006. "Analysis of a Plate-type Piezoelectric Composite Unimorph Actuator Considering Thermal Residual Deformation" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 30(4): 409~419
Goo Nam-Seo ; Woo Sung-Choong 2006. "Influence of Applied Electric Fields and Drive Frequencies on The Actuating Displacement of a Plate-type Piezoelectric Composite Actuator" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 30(5): 576~584