【摘要】 提出一种传递函数辨识方法。该方法使用非线性最小二乘曲线拟合法,结合控制对象的传递函数模型选取参数初始值,针对不同的频率特性分段拟合。使用该方法可以将复杂的控制系统频率特性转化为高精度的传递函数。在系统的中低频段内获得幅频±1dB和相频±1°的传递函数辨识精度。由此设计的数字补偿器有效补偿了机械谐振带来的影响,扩宽了控制系统的闭环带宽。传递函数辨识方法摆脱了数字补偿器设计依赖手工调试的状况,并可以提供复杂的数字补偿器以得到高性能的控制系统。更多还原

【Abstract】 A transfer function identification method is provided. In combination of nonlinear least squares curve fitting and choosing the initial parameter based on the transfer function model, this method implements curve fitting for different sections with different frequency characteristics. With this method the frequency characteristic of complex control system can be converted to accurate transfer function, thus ±1dB magnitude and ±1degree phase measurement accuracy of transfer function can be obtained in low and middle frequency range. The digital compensator based on the identified transfer function not only effectively eliminates the mechanical resonance but also expands the closed loop bandwidth of the system. The identification of transfer function can facilitate the design of a digital compensator to get rid of manual debugging and provide complex digital compensator for a high performance control system.更多还原