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The acoustic source strength of high-energy blast waves: combining measurements and a non-linear model

Author: Eerden, F.J.M. van der · Berg, F. van der
Type:article
Date:2010
Source:20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society, 23 August 2010 through 27 August 2010, Sydney, NSW, 130-134
Identifier: 465665
Keywords: Acoustics and Audiology · Acoustic sources · Blast waves · Conventional measurements · Equivalent-linear · Frequency contents · High energy · Military training · Ministry of defence · Mitigation measures · Netherlands · Non-linear model · Nonlinear source · Optimal balance · Propagation models · Sound level · Sound propagation · Source strength · Acoustic noise measurement · Acoustics · Industrial Innovation · Physics & Electronics · AS - Acoustics & Sonar · TS - Technical Sciences

Abstract

In the densely populated area of the Netherlands, the objective of the Netherlands Ministry of Defence is to find an optimal balance between military training and the impact on the surrounding civilian community. A special case concerns large weapons, such as artillery or demolitions, which create high-energy blast waves. These waves have a low frequency content, typically between 15 and 125 Hz, and can propagate over large distances. As a result it is a relative important cause for annoyance. The challenge is to determine accurately the acoustic source strength. This source is then used in a dedicated model for military training facilities, to calculate rating sound levels around the facility for different training situations and to calculate the effect of measures. This model uses a linear sound propagation and an equivalent linear source strength. The source strength is measured at a large distance, where the sound propagates linearly. As a consequence the ground and the meteorology have an important effect, and one has to correct for it. A more efficient approach has been tested, where the sound pressure measurements have been performed close to the source, at typically less than 10 meters distance. The linear source strength is then calculated by applying a non-linear propagation model. The results are compared to the conventional measurement method. Another advantage of applying the non-linear model, and the nonlinear source strength, is that the effect of mitigation measures close to the source can be determined.