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本文用闭环辨识方法获得开环不稳定的二次调节系统的开环数学模型，克服了系统参数不易确定的缺点，并将系统模型简化为二阶模型。在此基础上，用计算机控制输出转速，取得了较好的试验效果。
In this paper, the closed-loop identification method is used to obtain the open-loop mathematical model of the open-loop unstable secondary regulation system, which overcomes the shortcoming that the system parameters are not easy to be determined and simplifies the system model to the second-order model. On this basis, with the computer control of the output speed, and achieved a better test results.