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Design and Optimization Strategies of a High-Performance Vented Box

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Finding optimal geometries for noise barrier tops using scaled experiments.

Sergey I Voropayev¹, Nicholas C Ovenden², Harindra J S Fernando¹

¹Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA.

The Journal of the Acoustical Society of America

|March 4, 2017

Summary

Scaled acoustic experiments reveal novel barrier top designs outperform traditional screens. This research provides a new method for evaluating sound barrier performance for traffic noise reduction.

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Area of Science:

Acoustics
Noise control engineering
Experimental fluid dynamics

Background:

Traffic noise pollution is a significant environmental concern.
Traditional noise barriers have limitations in effectiveness.
Acoustic modeling offers a potential solution for optimizing barrier design.

Purpose of the Study:

To develop a methodology for assessing the acoustic properties of various barrier top designs.
To identify barrier geometries offering superior performance compared to conventional thin vertical screens.
To enable scaled acoustic modeling for efficient barrier design optimization.

Main Methods:

Utilized scaled laboratory experiments with short impulsive spherical sound pulses.
Employed spectral analysis to calculate insertion losses across frequencies.
Rescaled experimental results for full-size traffic barriers.

Main Results:

Quantified insertion losses for six different barrier top geometries.
Identified specific geometries demonstrating acoustic advantages over traditional designs.
Calculated single-number ratings of barrier performance for traffic noise.

Conclusions:

The developed methodology effectively characterizes acoustic performance of barrier designs.
Novel barrier top geometries show potential for enhanced traffic noise reduction.
Scaled acoustic modeling is a viable approach for optimizing noise barrier design.