Single-axis swept sine vibration control using extended Quasi-Newton method

According to the analysis based on the theories of norms and series, it is concluded that control system for swept sine vibration test may become unstable when the feedback gain is selected improperly for certain identified FRF. In order to solve the stability problem, a new control strategy is brought out, in which the FRF is refined in real-time by using quasi-newton method. Simulation and experimental results show that the algorithm successfully solves the potential stability problem and has rather high convergence rate.