Distributed Piezoelectric Sensor /Actuator Optimal Design for Active Vibration Control of Shell Structure

쉘 구조물의 진동제어를 위한 분포형 압전 감지기/작동기의 설계 최적화

  • 황준석 (서울대학교 항공우주공학과 대학원) ;
  • 목지원 (서울대학교 항공우주공학과 대학원) ;
  • 김승조 (서울대학교 항공우주공학과)
  • Published : 2000.04.01

Abstract

Distributed piezoelectric sensor and actuator system has been designed for the active vibration control of shell structure. PVDF is used for the materials of sensor/actuator. To prevent the adverse effect of spillover, distributed modal sensor/actuator system is established. Although shell structure is three-dimensional structure, the PVDF sensor/actuator system can be treated as two-dimensional Finite element programs are developed to consider curved structures having PVDF modal sensor/actuator. The nine-node Mindlin shell element with five nodal degree of freedoms is used for finite element discretization. The electrode patterns and lamination angle of PVDF sensor/actuator are optimized to design the modal sensor/actuator system Genetic algorithm is used for optimization. Sensor is designed to minimize the observation spillover, and actuator is designed to minimize the system energy of the control modes under a given initial condition. Modal sensor/actuator for the first and second modes of singly curved cantilevered shell structure are designed using mentioned methods. Discrete LQG method is used as a control law. Experimental demonstrations of the active vibration control with designed sensor/actuator system have been performed successfully.