2003 Volume 46 Issue 1 Pages 168-175
Multi-damped-oscillation control signals are applied in this study for active noise control (ANC) in an acoustic duct. Feedback active noise controllers that can generate damped-oscillation control signals are designed by using an internal model-based linear quadratic Gaussian (LQG) design technique. The low and upper bounds containing a desired ANC bandwidth is specified by two frequencies of the control signals. To acquire desired ANC performance, sound pressure attenuation ratios within the bandwidth are tuned by control signals of other frequencies and damping ratios. Computer simulation and experimental results show that sound pressure attenuation ratio of ≤ 0.3 and ≤ 0.5, respectively, can be achieved in a wide-band of 100Hz by using 3 damped-oscillation control signals. Experimental results also show effective noise reduction for time varying disturbance and band-limited white noise within the ANC bandwidth. These results support the feasibility of the designed controllers with damped-oscillation control signals for wide-band feedback active noise control in acoustic ducts.
JSME international journal. Ser. 1, Solid mechanics, strength of materials
JSME international journal. Ser. A, Mechanics and material engineering
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry
JSME international journal. Ser. C, Dynamics, control, robotics, design and manufacturing
JSME International Journal Series A Solid Mechanics and Material Engineering
JSME International Journal Series B Fluids and Thermal Engineering