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Fast, high resolution panel noise contribution method

Fast, high resolution panel noise contribution method
Fast, high resolution panel noise contribution method
All surfaces of a cabin interior may contribute to the sound pressure at a certain reference position, e.g. the human's ear. Panel noise contribution analysis (PNCA) involves the measurement of the contribution of separate areas. This is an effective method to determine the effect of apparent noise sources at a specific location.

This paper presents the latest developments on particle velocity based panel noise contribution analysis. In contrast to the traditional methods, the particle velocity approach is faster; it requires 3 days instead of weeks. While the theoretical base of the procedure in this paper is similar to previously published particle velocity based procedure, here the measurement protocol has now been simplified dramatically, which has reduced the measurement time even more to less than a day. The method and its implementation are explained in the paper and a full measurement procedure is reported. Four steps are required to determine and visualize the pressure contribution of the vehicle interior.

In a first step, probes are positioned on predefined interior surfaces. Special probe mounting have been made to decrease the handling time.

The second step is a measurement in a certain mode of operation. This step can be done in a laboratory but it is also possible to perform the measurement whilst driving the vehicle on the road. Stationary as well as non stationary running conditions like run ups are accessible and do not limit the applicability of the method.

The third step is the determination of the transfer paths from the panels to a certain listening position. This measurement is done assuming reciprocity. A monopole source is placed on the listener position and the sound pressure is measured at the surface.

In a fourth and last step the transfer paths are linked with the operational data gathered in step two. The results are then visualized using the predefined geometry model.

This paper describes the measurement of a conventional car with a resolution of 137 panels. Since an array of 46 probes was used step 2 and step 3 are repeated 3 times.
Tijs, Emiel
152dcd61-0cbd-4ce3-97d5-0e2b204a2b86
Wind, Jelmer
503691a7-5b54-4012-84c9-e29bb03da7d7
Fernandez Comesana, Daniel
156c0f0a-b641-4b56-8790-ff3d4dcb96fd
Tijs, Emiel
152dcd61-0cbd-4ce3-97d5-0e2b204a2b86
Wind, Jelmer
503691a7-5b54-4012-84c9-e29bb03da7d7
Fernandez Comesana, Daniel
156c0f0a-b641-4b56-8790-ff3d4dcb96fd

Tijs, Emiel, Wind, Jelmer and Fernandez Comesana, Daniel (2011) Fast, high resolution panel noise contribution method. SAE 2011 Noise and Vibration Conference and Exhibition, Grand Rapids, United States. 16 - 19 May 2011. 5 pp . (doi:10.4271/2011-01-1594).

Record type: Conference or Workshop Item (Paper)

Abstract

All surfaces of a cabin interior may contribute to the sound pressure at a certain reference position, e.g. the human's ear. Panel noise contribution analysis (PNCA) involves the measurement of the contribution of separate areas. This is an effective method to determine the effect of apparent noise sources at a specific location.

This paper presents the latest developments on particle velocity based panel noise contribution analysis. In contrast to the traditional methods, the particle velocity approach is faster; it requires 3 days instead of weeks. While the theoretical base of the procedure in this paper is similar to previously published particle velocity based procedure, here the measurement protocol has now been simplified dramatically, which has reduced the measurement time even more to less than a day. The method and its implementation are explained in the paper and a full measurement procedure is reported. Four steps are required to determine and visualize the pressure contribution of the vehicle interior.

In a first step, probes are positioned on predefined interior surfaces. Special probe mounting have been made to decrease the handling time.

The second step is a measurement in a certain mode of operation. This step can be done in a laboratory but it is also possible to perform the measurement whilst driving the vehicle on the road. Stationary as well as non stationary running conditions like run ups are accessible and do not limit the applicability of the method.

The third step is the determination of the transfer paths from the panels to a certain listening position. This measurement is done assuming reciprocity. A monopole source is placed on the listener position and the sound pressure is measured at the surface.

In a fourth and last step the transfer paths are linked with the operational data gathered in step two. The results are then visualized using the predefined geometry model.

This paper describes the measurement of a conventional car with a resolution of 137 panels. Since an array of 46 probes was used step 2 and step 3 are repeated 3 times.

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More information

Published date: May 2011
Venue - Dates: SAE 2011 Noise and Vibration Conference and Exhibition, Grand Rapids, United States, 2011-05-16 - 2011-05-19
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 346282
URI: http://eprints.soton.ac.uk/id/eprint/346282
PURE UUID: f7d7148f-f47f-4522-8cb5-7eb2a7354d31

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Date deposited: 18 Feb 2013 12:13
Last modified: 14 Mar 2024 12:35

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Contributors

Author: Emiel Tijs
Author: Jelmer Wind
Author: Daniel Fernandez Comesana

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