Presents the new independentmodal - space variable structure control for flexible structures with distributed parameter model , which is decoupled into a number of 2 - dimensional subsystems in terms of coordination transmission where , the variable structure control law is designed within the given boundary of structural uncertainty and disturbance , and concludes from simulation results that the algorithm is not only simple so as to accomplish in real time , but also is very robust 对具有分布参数模型的挠性结构提出了模态空间变结构控制方案，利用坐标变换把整个系统分为若干个独立的二维模态子空间.在每个独立的模态子空间内，在给定参数不确定性范围和干扰力矩范围的情况下，设计变结构控制控制器.通过仿真验证了控制算法的有效性;控制算法简单，易于实时完成，又具有较好的鲁棒性
On the basis of experimental research , this thesis applies 2 - dimensional non - linear finite element method to the analysis of transient temperature field on the section by means of relatively high precision triangular element of six joints . when the temperature field is analyzed , finite element reseaus are divided in space field and finite difference reseaus are divided in time field , and then the program is compiled . the computing results are in good agreement with the test data 在试验研究的基础上，本文采用精度较高的三角形六结点单元对构件截面二维非线性瞬态温度场进行了有限元分析，即在空间域内采用有限元网格划分，在时间域内采用有限差分网格划分，据此编制了计算程序，计算结果与试验数据符合较好，程序稳定性好，精度满足要求。
