Active Control of Sound in Acoustic Waveguides, Part II: Considerations for Implementation in Ducts

✍ Scribed by J.D. Stell; R.J. Bernhard

• Book ID: 102975130
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 670 KB
• Volume: 173
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1994.1226

✦ Synopsis

This is the second part of a paper which discusses the performance of active noise control systems in rigid-walled, finite length rectangular waveguides [1]. The first part presented the analytical development of the equations needed to analyze the performance of an active control system based on three performance criteria: the minimization of pressure at a selected set of points within the waveguide, the minimization of potential energy in a selected volume of the waveguide, and the minimization of power in the downstream region of the waveguide. The characteristics of optimal solutions under ideal circumstances were identified. Conditions under which these three performance criteria are analytically equivalent were also presented. The main focus of this part is to develop guidelines for configuring an active noise control system for conditions other than the ideal circumstances discussed in the first paper. Local control strategies are identified which achieve global control with reflective conditions at either end of the waveguide. Guidelines are identified for configuring an active control system that minimizes the pressure at a set of performance sensors as well as potential energy and power.