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以某空间相机镜筒作为控制对象,建立了热分析模型,提出了基于积分分离式比例积分(PI)主动热控制的温度控制方法。积分分离式PI算法采用增量式计算、位置式输出,将输出的加热功率值转换为一个控温周期内的加热时间。以相机镜筒的热分析模型为基础,通过Ziegler-nichols参数整定方法获取积分分离式PI算法的比例参数和积分参数,利用热分析软件Thermal Desktop对空间相机镜筒进行了热分析,获取控温算法的控温性能。结果表明:积分分离式PI控制方法响应快,消除了稳态误差,较比例(P)控制具有更好的动、静态特性,适用于有高精度控温需求的主动控温设计。
Taking a camera lens barrel as a control object, a thermal analysis model was established and a temperature control method based on integrated fractional integral proportional (PI) active thermal control was proposed. Integral split PI algorithm uses incremental calculation, position output, the output of the heating power value is converted to a temperature control cycle heating time. Based on the thermal analysis model of the camera tube, the proportional and integral parameters of the integral separation PI algorithm were obtained by the Ziegler-nichols parameter tuning method. The thermal analysis software was used to analyze the temperature of the camera tube, Temperature control performance of the algorithm. The results show that the integrated PI control method can respond quickly and eliminate the steady-state error. Compared with the proportional (P) control, the PI control method has better dynamic and static characteristics and is suitable for the active temperature control design with high-precision temperature control.