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Abstract

During ANC system design we will have to answer questions such as: “How is the acoustic pressure distributed in the interior?”, “What are the positions of the primary noise sources?” or “What will be the control profit, if active noise cancellation is applied? As we know, it will in many projects be impossible to perform time and cost intensive measurement campaigns. This is especially true in an early design stage in which we have neither a functional model nor a prototype. For this reason, the distribution of acoustic field variables has to be predicted by a numerical simulation that is based on an appropriate mathematical model. In view of the second question it must be emphasized that because of standing waves localization of sound sources in weakly damped enclosed sound fields is—especially in the low frequency range—a difficult mission. Noise source identification therefore requires advanced experimental and also advanced numerical approaches. In order to answer the third question we will have to estimate the amount of noise reduction that can be realized by a feed-forward ANC-system. Therefore, it will be necessary to analyze the correlation between the reference signals and the disturbance as well as to analyze the effect of transducer locations on the control profit. It is obvious that we need some specific instruments to process work packages that are associated with these questions. For this reason the upcoming chapter is dedicated to some tools that can be used in the ANC-system design process.

Keywords

Boundary Element Method Sound Pressure Finite Difference Method Acoustic Velocity Column Matrix 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, MechatronicsHelmut-Schmidt-University/University of the Federal Armed Forces HamburgHamburgGermany

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