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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

Surface contributions to radiated sound power.

Steffen Marburg¹, Eric Lösche, Herwig Peters

¹LRT4-Institute of Mechanics, Universität der Bundeswehr München, D-85579 Neubiberg, Germany. steffen.marburg@unibw.de

The Journal of the Acoustical Society of America

|June 8, 2013

Summary

This study introduces a novel method to pinpoint vibrating structure areas that generate sound power. It uses acoustic radiation modes to identify key sound-radiating surfaces, improving noise control strategies.

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Area of Science:

Acoustics
Vibration Analysis
Structural Acoustics

Background:

Identifying sound power sources on vibrating structures is crucial for noise reduction.
Acoustic intensity, a common measure, has limitations due to positive and negative values causing energy cancellation.
Existing methods struggle to precisely localize dominant sound-radiating areas.

Purpose of the Study:

To present a new method for identifying surface areas of vibrating structures that contribute to radiated sound power.
To compare the proposed method with acoustic intensity for near-field acoustic energy assessment.
To localize relevant radiating surface areas on vibrating structures.

Main Methods:

The method is based on calculating acoustic radiation modes for the structure's boundaries.
Surface contributions to sound power are computed using these modes.
The technique is demonstrated on a baffled square plate to analyze its radiated sound power.

Main Results:

The proposed method successfully identifies surface areas contributing to radiated sound power.
Unlike acoustic intensity, the computed surface contributions are always positive, avoiding cancellation effects.
The technique effectively localizes the primary sound-radiating regions on the structure.

Conclusions:

The presented method offers a reliable way to pinpoint sound-radiating areas on vibrating structures.
This technique enhances the understanding of acoustic energy radiation and noise generation.
It provides a valuable tool for targeted noise control and structural design optimization.