The Active Control of Noise and Vibration and Some Applications in Industry

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Abstract
During the last decade, advances in signal processing and microelectronics have brought to reality the development of active devices for suppressing noise and vibration. These have now been successfully demonstrated both in laboratory experiments, and under more rigorous conditions of large-scale industrial application. It is shown that close parallels exist between these novel active techniques and certain well-proven mechanical methods of reducing vibration. Examples of the latter are given which date back to the last century, and highlight the extent to which the basic principles of dynamic vibration cancellation have been applied with confidence by mechanical engineers. Now, in common with many other applications of control technology, the process of replacing simple mechanical linkages with more precise and responsive electronically activated servomechanisms has led to considerably improved flexibility and adaptability. In this respect the application of active control to vibration attenuation represents a natural and timely step in engineering development. A more recent advance, however, has been the application of these techniques to the direct control of airborne sound, which represents a greater departure from conventional engineering practice. A number of successful examples of such methods have now been demonstrated. It is proposed that more sophisticated devices, which will take even greater advantage of the power of modern signal processing, will be developed for the future. These devices promise to enhance considerably the overall scope of the technology.

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