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以新疆天文台南山25 m天线改造计划为背景,为达到通过副反射面补偿方法提高天线整体电性能以及自动换馈的目的,详细研究了基于模糊控制器的天线副反射面调节系统。以六自由度并联平台伺服系统为被控对象,运用Simulink仿真软件对模糊控制器进行了在无噪声阶跃输入、有噪声阶跃输入、无噪声弦波输入和有噪声弦波输入条件下的系统仿真,并进行了详细的误差分析,得到了性能最优的系统模型参数,同时得到了在模糊控制器作用下的副反射面调节系统的基本运行性能参数:在弦波信号作用下系统响应误差小于等于0.09 mm,在阶跃信号作用下系统稳态误差为0.001 1 mm,且调节时间约为0.3 s。实验结果表明基于模糊控制器的控制系统整体性能良好,能快速、稳定、准确地完成副反射面调节任务,进而提高天线的整体电性能,满足天文观测和深空探测对数据准确性和系统可靠性的要求,具有一定的应用价值。
Taking the Nanshan 25 m antenna reconstruction plan of Xinjiang Observatory as a background, in order to achieve the purpose of improving the overall electrical performance and automatic feed-in of the antenna by the method of secondary reflector compensation, the antenna secondary reflective surface adjustment system based on fuzzy controller is studied in detail. A six-degree-of-freedom parallel platform servo system is taken as the controlled object. Simulink simulation software is used to simulate the fuzzy controller under the conditions of no-noise step input, noisy step input, no-noise sinusoidal input and noisy sinusoidal input System simulation and detailed error analysis, the optimal model parameters of the system are obtained, and the basic performance parameters of the sub-reflection surface adjustment system under the action of the fuzzy controller are obtained: the system response under the action of the sine wave signal The error is less than or equal to 0.09 mm, the steady-state error of the system under the step signal is 0.001 1 mm, and the adjustment time is about 0.3 s. The experimental results show that the control system based on fuzzy controller has good overall performance and can accomplish the task of sub-reflection surface adjustment quickly, stably and accurately, and then improve the overall electrical performance of the antenna to meet the requirements of astronomical observation and deep space exploration for data accuracy and system reliability Sexual requirements, has a certain application value.