【作者】 郭军华；

【导师】 张俊红；

【作者基本信息】 天津大学 ， 动力机械及工程， 2007， 硕士

【摘要】 为了能系统的讨论300MW汽轮机转子轴系实验模型的振动和控制问题,本文以300MW汽轮机转子轴系实验模型为研究对象,以CAE为研究手段,进行了瞬态响应的研究,探讨了300MW汽轮发电机组模化的集总参数模型进行弯曲振动鲁棒控制问题,主要研究工作如下:建立了300MW汽轮机转子轴系实验模型的有限元连续模型;对模型在刚性约束和弹性约束条件下进行了模态分析,讨论模态分析结果;对连续模型,选取典型激励(简谐衰减激励和阶跃缓振激励),在刚性约束下和弹性约束下分别进行了瞬态分析,得出轴系在弹性约束下较刚性约束下更能反映轴系的实际的动力学特性的结论;使用ADAMS-Simulink联合控制仿真系统建立模型轴系多体动力学仿真模型,求得典型激励下(简谐衰减激励和阶跃缓振激励下)模型的动力学响应,设计了鲁棒控制器,施加控制,并通过与PID控制进行比较,最终验证了鲁棒控制能够有效地消减了轴系模型在典型激励下的振动响应。针对轴系最左端面和发电机右端面的弯曲振动响应进行控制理论的研究。为避免运行过程中受到的各种激励形式造成的扰动,设计了一种鲁棒轨迹控制器,保证了跟踪误差的一致终值有界。最后,通过模拟仿真对所提出的鲁棒控制方案与开环控制方案进行了比较,结果表明鲁棒轨迹控制具有更高的控制精度和稳定性。更多还原

【Abstract】 In order to induce the vibration of the experimental platform that simulates the 300MW steam turbo-generator rotor shaft system, one robust control method is applied here in this dissertation. Moreover, the transient analysis on the Finite Element Models of the shaft system is also discussed. Some creative work is as following:FE elastic continuous body model are set up, and modal analysis was conducted under the condition of the free and constrained boundary condition. Transient analysis of continuous body model with elastic and rigid support is furthermore conducted with some typical excited torque, and the conclusion is that the continuous body model with elastic support was more suited to dynamic analysis. Flexible multi-body dynamic model of shaft model has been established in ADAMS-Simulink co-simulation system, the dynamics response is achieved.A robust controller is designed to guarantee the tracking errors uniformly and ultimately bounded. At last, the simulation result shows that the robust control law has a higher tracking precision and stability than the open-loop control law by comparison.更多还原