Real-time adaptive active control of sound fields
Abstract
A general strategy is developed for the attenuation of sound in three-dimensional acoustic fields. This strategy includes a classification scheme for active noise control problems based on characterizations of the noise source, the acoustic field, the desired attenuation, and the control system. This classification scheme provides a framework for the analysis of active noise control problems. A strategy for choosing transducer locations for active noise control systems is developed based on analysis of acoustic systems as well as recommendations from the active noise control literature. Both adaptive and non-adaptive active noise control algorithms are developed based on minimum variance feedback control theory. Simulations of these controllers show them to be very effective and provide useful guidelines for the implementations. Implementations of these controllers are described. The use of measurable disturbances and additional outputs is incorporated into the adaptive controller. This approach is shown to be useful for certain combinations of disturbances. When additional outputs are used, the control is referred to as pseudo-feedforward control.
Degree
Ph.D.
Advisors
Shoureshi, Purdue University.
Subject Area
Mechanical engineering
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