两端固定n根系列连接的Timoshenko梁在连接点加控制的镇定问题

ANALYSIS OF STABILITY FOR n-CONNECTED TIMOSHENKO BEAMS WITH BOTH ENDS FIXED AND FEEDBACK CONTROLLER AT INTERMEDIATE NODES

文章研究两端固定n根系列连接的Timoshenko梁系统的镇定问题,假设该系统在连接点处剪切力和弯曲力矩是连续的,而横向位移和旋转角度是不连续的.在连接点处设置控制器,观测节点处的力,通过补偿器补偿后反馈回系统,构成闭环系统.通过对系统的矩阵化处理,对算子谱采用渐近分析的技巧,证明得到该闭环系统是渐近稳定的.并利用算子谱的分布等性质,在一定条件下得到了闭环系统的Riesz基性质,从而系统满足谱确定增长条件.

The stabilization problem of n-connected Timoshenko beams is studied. Suppose that both ends of the beams are claped, and at intermediate nodes, the shearing force and bending moment are continuous, but the displacement and rotational angle of beams are discontinuous. Shearing force and bending moment at intermediate nodes can be observed. The compensators are designed to obtain the displacements and rotational angles, and the feedback controllers at intermediate nodes are designed to stabilize the system. It is shown that the closed loop system is asymptotically stable. By a lengthy spectral analysis of the system, it is proven that the closed loop system is of Riesz basis property under some conditions. Hence, the spectrum determined growth condition holds.