By Thomas Kletschkowski
This publication provides a mechatronic method of lively Noise keep watch over (ANC). It describes the mandatory parts of process concept, engineering acoustics, electroacoustics and adaptive sign processing in a complete, constant and systematic demeanour utilizing a unified notation. additionally, it encompasses a layout method for ANC-systems, explains its software and describes instruments for use for ANC-system layout. From the examine viewpoint, the ebook provides new techniques to sound resource localization in weakly damped interiors. One relies at the inverse finite aspect process, the opposite relies on a valid depth probe with an lively unfastened box. in addition, a prototype of an ANC-system in a position to achieve the actual limits of neighborhood (feed-forward) ANC is defined. this can be one instance for utilized study in ANC-system layout. different examples are given for (i) neighborhood ANC in a semi-enclosed subspace of an plane shipment carry and (ii) for the combo of audio leisure with ANC.
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Extra info for Adaptive Feed-Forward Control of Low Frequency Interior Noise
7 Deviation of mean intensity measured in a laboratory using the first SIAF realization and a conventional sound intensity probe . 1 Parameters of the finite element model adjusted for two excitation frequencies . . . . . . . . . . . . 1 Number of nodes in the applied finite element models according to (Weber 2009) . . . . . . . . . . . . . 304 Part I Introduction Chapter 1 Introduction to Interior Active Noise Control 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.
16 1 Introduction to Interior Active Noise Control Fig. 10 Layout of ANC-system with multiple inputs and multiple outputs installed in a propeller driven aircraft (adapted from Johansson 2000) Fig. 11 Effectiveness of ANC applied to tonal noise in commercial propeller driven aircraft (Saab 2000). Original time recorded data were taken from (Ultra Electronics 2009). FFT-Analysis was performed to generate the power spectra of controlled and uncontrolled microphone signal The effectiveness of the Saab 2000 ANC-system is shown in Fig.
4 Reverberation times and average absorption coefficients measured in a laboratory . . . . . . . . . . . 5 Mean intensity measured with a conventional intensity probe in a laboratory . . . . . . . . . . . . . . 6 Mean intensity measured with the actively controlled SIAF in a laboratory . . . . . . . . . . . . . . . 7 Deviation of mean intensity measured in a laboratory using the first SIAF realization and a conventional sound intensity probe . 1 Parameters of the finite element model adjusted for two excitation frequencies .
Adaptive Feed-Forward Control of Low Frequency Interior Noise by Thomas Kletschkowski