本文中提出偏差结构方块图法的概念,推导作用点随机的扰动信号的计算扰动偏差的公式,统一输入信号和扰动信号计算偏差的公式和系统关于偏差的型号分类。不失一般性,考虑Fig.1方块图系统,假定各扰动信号均为正号,主反馈通道的H_1(s)通常不含有纯积分与纯微分环节的因子,其稳态数学模 In this paper, the concept of the block diagram of the deviation structure is proposed. The formulas for calculating the perturbation deviation of the random perturbation signal at the point of action are deduced. The formula for calculating the deviation of the input signal and the disturbance signal and the type classification of the system about the deviation are derived. Without loss of generality, consider the Fig. 1 block diagram system, assuming that all disturbance signals are positive signs, H_1 (s) of the main feedback channel usually does not contain the factors of pure integral and pure differential, and its steady-state mathematical model