Study On Active Control Of Structural Responses For Helicopter With Complex External Disturbances

The Active Control of Structural Response (ACSR) is an advanced vibration reducing system forhelicopter. Compared to the conventional methods, the ACSR had more advantages. And its core is theadaptive control algorithm. In this dissertation, two improved algorithms to solve the instableprograms coursed by complex external disturbances were carried out, Simulations and experimentshave been conducted.(1) Research on the new adaptive filtering algorithm with online secondary path modeling in timedomain. In order to improve the performance of active vibration control of helicopter under complexdisturbances environment, two new adaptive filtering algorithms are presented. One is a variable stepsize LMS adaptive filtering algorithm, which using a variable step size instead of the fixed one is usedto increase the speed of convergence. Another is a weight-constrained filtered-x LMS algorithm whichcan reduce the influence of disturbances to the secondary path.(2) The simulation of the adaptive control arithmetic was conducted by MATLAB/SIMULINK.This is carried out on single-input/single-output and four-input/two-output systems using a helicoptermodel. The simulation results verified the correctness and effectiveness of the control methods. Thenthe effects of some important parameter to the control system were studied.(3) Based on the SEED-DEC33DSP, the adaptive control algorithm was fulfilled with CCS.Then the code was optimized according to the practical situation, so the controller design wasfinished.(4) Experiments of active vibration control were carried out in Laboratory. The test resultsverified the correctness and effectiveness of the new adaptive control algorithms in time domain.