Method for identifying system containing saturation nonlinearity
A nonlinear system and variance technology, applied in the field of identification of nonlinear systems with saturation, can solve problems such as inability to fully reflect closed-loop characteristics, system identification methods cannot obtain saturation limits, and it is difficult to ensure sufficient excitation of the system, so as to achieve good engineering practicality sexual effect
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[0019] The present invention will be further described below in conjunction with accompanying drawing and example. It should be understood that what is described here is only a specific example of the present invention, and is not intended to limit the protection scope of the present invention. Any equivalent replacement or improvement made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.
[0020] Taking a certain position servo system as an example, its speed saturation limit is ±0.3m / s, and the closed-loop transfer function of the system is,
[0021]
[0022] The system sampling time is 0.001s. Using the method provided by the present invention to identify the above-mentioned system with velocity saturation, the specific steps are as follows:
[0023] S1. Design the input signal to fully excite the system. Here, the sinusoidal frequency sweep signal is selected as the system in...
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