The Design, Experiment And Theoretical Analysis Of Intelligent Active Member

In this paper, a new intelligent active member was designed and manufactured, which can sense its location and force to adaptively control and improve performance of deployable structures. The design was developed for a piezoelectric micro-placement actuator based on the actuation effect of piezoelectric materials. The composition of the intelligent active member and its operating mechanism are presented for aerospace adaptive-deployable structures. This new- active member includes a piezoelectric actuator, a micro-placement sensor to measure the output placement and output force. The theoretic design, selection of parameters, and their influences on properties of the active member are also discussed.The dynamic properties of the piezoelectric active member can't be neglected, especially in its area of resonance. So it is more and more important to build dynamic model. Based on the conditions of electromagnetics principle ,of actuation effect of piezoelectric materials, of the mechanical balance equations, of the geometry equations., of the boundary conditions of the piezoelectric active member and the application of finite element method, the dynamic equation of piezoelectric active member is formulated.The operation properties of the piezoelectric active member ,such asits output displacement, output force and the relative problems, are experimentally studied in this paper. The experiment demonstrated the non-linear relation for the mechanical outputs to the applied voltage of the active member. The experimental results show that the piezoelectric active member tallies with the design demand and accords with the theoretical analysis on the whole.In this paper, a new double-actuator intelligent active member is designed and its patent has been applied. Based on the application of finite element method, the dynamic equation of the new piezoelectric active member is formulated and the properties of its static state is also analysed. The theoretical analysis shows that its output displacement , output force and its work range is more great than the one-actuator intelligent active member. According to the theoretical analysis, it can be available to the vibration control and precision orientation.