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Related Experiment Video

Updated: Feb 8, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Model-scale jet noise analysis with a single-point, frequency-domain nonlinearity indicator.

Kyle G Miller¹, Kent L Gee¹

¹Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.

The Journal of the Acoustical Society of America

|July 2, 2018

Summary

A new nonlinearity indicator (νN) quantifies nonlinear acoustic effects in jet noise. This indicator reveals nonlinear effects concentrate near the jet plume, offering advantages over existing methods.

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Area of Science:

Acoustics
Fluid Dynamics
Nonlinear Acoustics

Background:

Nonlinear acoustic phenomena are significant in high-speed jet noise.
Previous research derived indicators from the generalized Burgers equation (GBE).

Purpose of the Study:

To calculate and analyze a single-point, frequency-domain nonlinearity indicator (νN) for jet noise.
To compare the νN indicator with other nonlinear acoustic metrics.

Main Methods:

Calculated the nonlinearity indicator (νN) from an ensemble-averaged, frequency-domain GBE.
Analyzed noise from a model-scale jet at Mach 0.85, 1.8, and 2.0.
Compared νN trends with pressure-derivative skewness and bicoherence.

Main Results:

Nonlinear effects concentrate along radials near the jet plume with high sound pressure levels (SPL).
The νN indicator, along with absorption indicators, predicts decay consistent with nonlinear theory for monofrequency sources.
The νN indicator demonstrates qualitative and quantitative advantages over other metrics.

Conclusions:

The νN indicator effectively quantifies nonlinear acoustic effects in jet noise.
Nonlinear acoustic phenomena are spatially concentrated near the jet plume.
The νN indicator offers improved analysis capabilities for nonlinear acoustics.