Active Noise Control of Exhaust Duct Using Two-Degree-of-Freedom Control System with Model Matching

Abstract

This paper describes the study of active noise control schemes using two-degree-of freedom control based on model matching for a one-dimensional exhaust duct. In this study, at first, the models are identified using measured frequency responses. Then the feedback controller is designed by using H^∞ control theory and the feedforward controller is designed by using model matching theory. Simulations and experiments are carried out using the designed controllers. The experimental results show a good agreement with the simulation results, and noise reduction of more than 15 dB is obtained over the frequency range from 100 Hz to 500 Hz at the microphone location.