## A Monte-Carlo investigation of the uncertainty of acoustic decay measurements

Publication: Research - peer-review › Article in proceedings – Annual report year: 2012

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**A Monte-Carlo investigation of the uncertainty of acoustic decay measurements.** / Cabo, David Pérez; Seoane, Manuel A. Sobreira; Jacobsen, Finn.

Publication: Research - peer-review › Article in proceedings – Annual report year: 2012

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*Proceedings - European Conference on Noise Control.*S. Hirzel Verlag GmbH, pp. 531-536.

### APA

*Proceedings - European Conference on Noise Control.*(pp. 531-536). S. Hirzel Verlag GmbH.

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*Proceedings - European Conference on Noise Control.*S. Hirzel Verlag GmbH. 2012. 531-536.

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### Bibtex

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### RIS

TY - GEN

T1 - A Monte-Carlo investigation of the uncertainty of acoustic decay measurements

AU - Cabo,David Pérez

AU - Seoane,Manuel A. Sobreira

AU - Jacobsen,Finn

PY - 2012

Y1 - 2012

N2 - Measurement of acoustic decays can be problematic at low frequencies: short decays cannot be evaluated accurately. Several effects influencing the evaluation will be reviewed in this paper. As new contribution, the measurement uncertainty due to one-third octave band pass filters will be analysed, taking into account the influence of the magnitude response and the phase distortion. It will be shown how the error not only depends on the filter but also on the modal density and the position of the resonances of the system under test within the frequency band. A Monte-Carlo computer simulation has been be set up: the model function is a model of the acoustic decays, where the modal density, the resonances of the system, and the amplitude and phase of the normal modes may be considered as random variables. Once the random input variables and the model function are defined, the uncertainty of acoustic decay measurements can be estimated. Different filters will be analysed: linear phase FIR and IIR filters both in their direct and time-reversed versions. © European Acoustics Association.

AB - Measurement of acoustic decays can be problematic at low frequencies: short decays cannot be evaluated accurately. Several effects influencing the evaluation will be reviewed in this paper. As new contribution, the measurement uncertainty due to one-third octave band pass filters will be analysed, taking into account the influence of the magnitude response and the phase distortion. It will be shown how the error not only depends on the filter but also on the modal density and the position of the resonances of the system under test within the frequency band. A Monte-Carlo computer simulation has been be set up: the model function is a model of the acoustic decays, where the modal density, the resonances of the system, and the amplitude and phase of the normal modes may be considered as random variables. Once the random input variables and the model function are defined, the uncertainty of acoustic decay measurements can be estimated. Different filters will be analysed: linear phase FIR and IIR filters both in their direct and time-reversed versions. © European Acoustics Association.

KW - Acoustic noise

KW - Acoustic variables control

KW - Computer simulation

KW - Decay (organic)

KW - Frequency bands

KW - Uncertainty analysis

KW - Decay measurements

KW - FIR and IIR filters

KW - Linear phase

KW - Low frequency

KW - Magnitude response

KW - Measurement uncertainty

KW - Modal density

KW - Model functions

KW - MONTE CARLO

KW - Normal modes

KW - Phase distortions

KW - Random input

KW - System under test

KW - Time-reversed

M3 - Article in proceedings

SN - 9788001050132

SP - 531

EP - 536

BT - Proceedings - European Conference on Noise Control

PB - S. Hirzel Verlag GmbH

ER -