Dynamic Analysis Of Space Deployable Antenna (Composed By Two Space Beams)

Deployable space antenna is one of the major developing trends of modern space technique. Because there is a far-ranging applied foreground about it,many countries have developed it. Due to the characters of large size,lightweight and great flexible about it,there are many difficulties in dynamical analysis,structure design and control. Therefore,wide attention is brought.In this paper, most of articles about researches on space deployable antennas are summarized,based on the physical meaning of the shaft, axis coordinate system and axis coordinate transformation matrix are introduced, a rotation transformation matrix about rotating around the driving shaft is given, flexible multi-body dynamics analysis method is used, description method about any point on flexible body rotating around the driving shaft is given. To combine the finite element and Lagrange's equation, dynamics equations of the real space flexible multi-body system are given(including the specific expressions of the mass matrix,the derivative of mass matrix,speed quadratic,generalized force and so on), and symbolic mathematical tools are used to derive analytical expressions of coefficient matrixes of dynamic equations about general space bar, beam, plate element, using a new method is used to analyze the dynamic response of the unfolding process of antennas, and my dynamics theory about the flexible multi-body rotating around the driving shaft is verified.