OPTIMAL EXCITATION OF A DOUBLE-CURVED SHALLOW SHELL BY A MACRO FIBER COMPOSITE ACTUATOR

摘要

Shell structures are widely used in the areas such as aerospace, navigation and automotive industry. In these applications, undesirable vibrations not only degrade system performance but also influence the structural integrity and reliability. In recent years, piezoelectric actuators are used widely in shell structures vibration control due to its converse piezoelectric effect. Piezoelectric ceramic material (PZT), polyvinylidene fluoride (PVDF) and macro fiber composite (MFC) are three candidates for piezoelectric actuators. Due to high flexibility and high electromechanical coupling characteristics, MFC actuators are outstanding in the vibration control for shell structures. In this paper, a simply supported double-curved shallow shell excited by an MFC actuator is investigated. The electromechanically coupled equations of a double-curved shallow shell with an MFC actuator attached are established. Actuation equations of the actuator are derived and the actuation characteristics of the actuator are explored. Based on the analytical expressions of the actuation forces and moments, position for the actuator used on a double-curved shallow shell is optimized and the optimal results are numerically verified by vibration kinetic energy of the system. The results show that the optimal position for an MFC actuator can be presented by the optimal position function or their combinations.