| According to the characteristics of double ayer cylindrical lattice shell, a controller for semi ctive variable stiffness/damping in lattice hell structures is proposed in this thesis. On the basis of analysis of vibration characteristics and seismic behavior of double ayer cylindrical lattice shell, a improved control algorithm, modal energy exchanging algorithm, is brought forward. A method for optimizing the placement of controllers in double ayer cylindrical lattice hell structure is invented. A lot of examples are computed by some programs written with MATLAB language. The results of computer simulation prove the validity and feasibility of modal energy exchanging algorithm and the method for optimizing placement of controllers. The method for placing the controllers in double ayer lattice hell structures is summarized from the computing results. The relations between the vibration reducing coefficient and parameters of the structure are studied. |
