Abstract
Before we start with a detailed analysis of active noise control systems and their application to enclosed sound fields, it is necessary to motivate both the idea and the limits of active control. Furthermore, it will be necessary to describe the interior noise problem and to distinguish between different concepts that can be used to reduce interior noise by means of active control. The upcoming chapter is therefore subdivided into four sections. The first is focused on the fundamental idea of active control, whereas the second contains remarks on active control of interior noise and, to motivate the active noise control approach, an illustrative example concerning aircraft cabin noise caused by propeller rotation. The intention of the third section is to provide some information on the state of the art, while the last section describes both objective and structure of this book.
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Notes
- 1.
More precisely we have to formulate: The natural frequency of the cavity model for the case that the structural displacement is zero.
- 2.
An example of a guideline restricted to the explicitly defined topic of active vibration isolation is to be found in (VDI 2064 2008).
- 3.
The determination of precisely what constitutes low frequency noise is not perfectly clear in terms of the lower and the upper limit (Berglund and Hassmén 1996). However, in this book the term low frequency noise means that the frequency of the disturbance f is less than the Schröder frequency f Sch . The latter is determined by the reverberation time T 60 and the size of the air filled volume V such as \(f_{\mathit{Sch}} = 2000\sqrt {T_{60}/V}\), see (Nelson and Elliott 1992).
- 4.
Please notice that excellent textbooks on adaptive filtering that naturally contain algorithmic formulations were of course already published, e.g. (Moschytz and Hofbauer 2000) and (Sayed 2003). However the “connection” to ANC, as established in (Kuo and Morgan 1996) and (Elliott 2001), is missing in these books.
- 5.
This statement is true except for (Fahy and Gardonio 2007). The main topic of this reference is however not ANC, but rather the physics of sound and structural vibration. For this reason it naturally contains an introduction to numerically based analyses of fluid-structure interaction.
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Kletschkowski, T. (2012). Introduction to Interior Active Noise Control. In: Adaptive Feed-Forward Control of Low Frequency Interior Noise. Intelligent Systems, Control and Automation: Science and Engineering, vol 56. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2537-9_1
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