The impact of including diffraction when predicting the effect of listener environment on the perceived loudness of outdoor sonic booms

Amanda Lind, Victor W. Sparrow

Research output: Contribution to journalConference article

Abstract

The human impact of sonic booms varies with listening environment. Given the incident sonic boom waveform, the specular field around a realistic geometry has been predicted via a C++ implementation of image source method (ISM) tailored to this outdoor application. This work explores the necessity of including the diffracted field when predicting time series and perceived loudness (PLdB), both in and out of the shadow zone. The impulsive nature of the excitation, and the sensitivity of the PLdB to temporal details, constrains appropriate diffraction modeling techniques to those capable of time domain accuracy. Uniform Theory of Diffraction (UTD) and Biot Tolstoy Medwin (BTM) models are considered, exploring the benefits and challenges of each approach, particularly with regards to scalability and bandwidth. The importance of accurately predicting diffraction for this application is evaluated through comparison with booms recorded around a building corresponding to the simulated geometry.

Original languageEnglish (US)
Article number040049
JournalProceedings of Meetings on Acoustics
Volume19
DOIs
StatePublished - Jun 19 2013
Event21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada
Duration: Jun 2 2013Jun 7 2013

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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