双振动台随机振动H(下标 ∞)双自由度综合控制研究

A new approach was presented for dual-shaker random vibration test using H∞-based optimal decoupling method with two-degree-of-freedom controller, without taking cross-spectra into account. A cantilever beam was used to verify the proposed control approach. A two-input two-output control model was set up based on the beam. The simulation results demonstrated that, in frequency range of 20 Hz to 2000 Hz, the controller can make the error between the output PSD (power spectral density) and the reference PSD be less than ±1dB, which is perfect for the dual-shaker random vibration control test. Finally, a test was performed and the test results showed that the proposed method can meet the engineering demands.