Research On Analysis And Vibration Control Of Rotating Flexible Intelligent Structure

With the developments of aero-industry, there have been the higher demands for the movement of satellites, dynamic feature, as well as the vibration control of the flexible beams and the solar sail and other flexible components. Meanwhile, with the developments of scientific technology, the composing parts of each project tend to be lighter and softer in order to reduce energy consumption or to make it meet the demand of auto-movement .However, considering the vibration and precision caused by the elastic deformation of the flexible beams, inserting piezoelectric intelligent material into the construction is a very promising method to control the vibration. Piezo-electricity smart material is characterized by rigidity, lightness, low energy consumption and easily controlled, while the inserting of smart materials will cause coupled problems such as power, electricity and magnetism. Therefore, the research of flexible multi-body system is becoming the focus of scientific researchers. The modeling, vibration control andnumerical computation are discussed, studied and simulated in the dissertation.Based on the theory of continuums mechanics and considering the coupledbehavior of the transverse and axial deformations, a first-order approximately coupled model (FOACM) is obtained. The flexible deformation is described by the first-orderapproximately coupled model, which has added a second-order item dx,which is used in the rotating rigid-flexible coupled system. Based on the Hamilton Principle and the Finite Element Method, a non-linear discrete dynamic equation is worked out. The dynamic feature of the construction in open and closed loop is demonstrated through numerical simulation, and the influence of tip mass and centrifugal force on the rigidity and frequency of the construction is also figured out.The Sliding Model Control (SMC) is used to deal with the vibration control of the rigid-flexible coupling construction. Based on the dynamic equation established, the control of the rotating rigid-flexible smart structure system of the tip mass is proved to be effective. The insensitivity of the Sliding Model Control makes it have a strong advantage in non-linear control field. However, the incapability of its control over the undefined parts of the system degrades its advantages. Considering this point, in the dissertation, the undefined part is modeled by Artificial Neural Networks, while the...