Sine Swept Vibration Control Based on Offline Iteration Technique

Sine swept vibration experiment using traditional PID control strategy represents poor accuracy. For this reason, this paper proposes the error compensation control strategy Based on multiple offline iteration. The proposed strategy applies the H1 estimator method to identify the system frequency response function (FRF) and then combines the identified FRF, Fast Fourier Transform (FFT) and inverse Fast Fourier Transform (IFFT) technique to correct the input sine swept signal to implement the sine swept test. The error of the expected output signal and the experiment output signal is calculated and corrected using FFT, IFFT and FRF to compensate the input signal. The updated input signal is used to implement the sine swept test again and so on, until the output signal meets the accuracy requirement. The procedure of the proposed control strategy is programmed using the software MATLAB/Simulink and then compiled to a real-time PC with Microsoft Visual Studio.NET for implementation. Simulation results, backed up by corresponding experimental ones, demonstrate that the proposed control strategy achieves satisfactory accuracy with offline iteration twice.