Brian E. Anderson
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View article: Classroom voice amplification systems usage and other work- related factors in teachers' vocal health
Classroom voice amplification systems usage and other work- related factors in teachers' vocal health Open
Teachers frequently experience voice problems that can impact their ability to teach and hinder student learning.A common preventative response is providing voice amplification systems.This aim of this study was to: (1) investigate the rel…
View article: Laboratory testing and model calibration of a crushed stone backfill in a geosynthetic reinforced soil wall
Laboratory testing and model calibration of a crushed stone backfill in a geosynthetic reinforced soil wall Open
The objective of this study was to understand the effect of the choice of backfill constitutive models on the numerical simulation of a geosynthetic reinforced soil-integrated bridge system (GRS-IBS). The #89 material, a crushed angular gr…
View article: Time reversal imaging of complex sources in a three-dimensional environment using a spatial inverse filter
Time reversal imaging of complex sources in a three-dimensional environment using a spatial inverse filter Open
Time reversal focusing above an array of resonators creates subwavelength–sized features when compared to wavelengths in free space. Previous work has shown the ability to focus acoustic waves near the resonators with and without time reve…
View article: Errata: The song of the singing rod [J. Acoust. Soc. Am. <b>131</b>, 2435–2443 (2012)]
Errata: The song of the singing rod [J. Acoust. Soc. Am. <b>131</b>, 2435–2443 (2012)] Open
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View article: Time reversal in a phononic crystal using finite-element modeling and an equivalent circuit model
Time reversal in a phononic crystal using finite-element modeling and an equivalent circuit model Open
A phononic crystal acts as a dispersive medium with a phase speed that is lower than the bulk wave speed at frequencies below the resonance of a single resonator. Time reversal is used to compensate for the phase shifts caused by individua…
View article: Super-resolution within a one-dimensional phononic crystal of resonators using time reversal in an equivalent circuit model
Super-resolution within a one-dimensional phononic crystal of resonators using time reversal in an equivalent circuit model Open
An equivalent circuit model has been developed to model a one-dimensional waveguide with many side-branch Helmholtz resonators. This waveguide constitutes a phononic crystal that has been shown to have decreased phase speed below the reson…
View article: Development of software for performing acoustic time reversal with multiple inputs and outputs
Development of software for performing acoustic time reversal with multiple inputs and outputs Open
At Brigham Young University, acoustic time reversal experiments are conducted in solids and fluid media. The experimental setup involves synchronized generation and acquisition hardware. The synchronized hardware allows for multi-channel g…
View article: Solving one-dimensional acoustic systems using the impedance translation theorem and equivalent circuits: A graduate level homework assignment
Solving one-dimensional acoustic systems using the impedance translation theorem and equivalent circuits: A graduate level homework assignment Open
The natural frequency resonances and sound radiation from one-dimensional acoustic systems are of great interest in the study of musical instruments, human vocal tract effects on speech, automotive exhaust pipes, duct systems for temperatu…
View article: Understanding Acoustics: An Experimentalist's View of Sound and Vibration, Second Edition
Understanding Acoustics: An Experimentalist's View of Sound and Vibration, Second Edition Open
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View article: High-amplitude time reversal focusing of airborne ultrasound to generate a focused nonlinear difference frequency
High-amplitude time reversal focusing of airborne ultrasound to generate a focused nonlinear difference frequency Open
Time reversal (TR) focusing of airborne ultrasound in a room is demonstrated. Various methods are employed to increase the amplitude of the focus. These methods include creating a small wooden box (or chamber) to act as a miniature reverbe…
View article: The impact of room location on time reversal focusing amplitudes
The impact of room location on time reversal focusing amplitudes Open
Time reversal (TR) is a signal processing technique often used to generate focusing at selected positions within reverberant environments. This study investigates the effect of the location of the focusing, with respect to the room wall bo…
View article: Design of an underwater acoustics lab
Design of an underwater acoustics lab Open
A new underwater acoustics laboratory has been created at Brigham Young University. Care was taken to design the lab that can take high precision measurements and yet provide an optimal environment for training undergraduate student resear…
View article: A comparison of impulse response modification techniques for time reversal with application to crack detection
A comparison of impulse response modification techniques for time reversal with application to crack detection Open
Time reversal (TR) focusing used for nonlinear detection of cracks relies on the ability of the TR process to provide spatially localized, high-amplitude excitation. The high amplitude improves the ability to detect nonlinear features that…
View article: Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic
Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic Open
The Time Reversed Elastic Nonlinearity Diagnostic (TREND) has a long history of successful nondestructive detection of cracks in solids using nonlinear indicators. Recent research implemented TREND to find stress corrosion cracking (SCC) i…
View article: Selecting a new textbook for a graduate level course on vibration and fluid acoustics
Selecting a new textbook for a graduate level course on vibration and fluid acoustics Open
At Brigham Young University we offer a graduate level course on the fundamentals of acoustics. This course has traditionally covered vibrations in masses and springs, strings, bars, membranes and plates in the first half of the course. The…
View article: Nonlinear resonant ultrasound spectroscopy of stress corrosion cracking in stainless steel rods
Nonlinear resonant ultrasound spectroscopy of stress corrosion cracking in stainless steel rods Open
Stainless steel containers are susceptible to stress corrosion cracking (SCC) under certain stress and corrosion conditions. Nonlinear ultrasonic techniques are very sensitive to the early presence of damage, more so than linear techniques…
View article: Understanding radiation impedance through animations
Understanding radiation impedance through animations Open
It is very common for students to struggle to grasp a conceptual understanding of radiation impedance. Often graduate students need exposure to impedance concepts in more than one course before they start to understand its importance and m…
View article: The effect of transducer directivity on time reversal focusing
The effect of transducer directivity on time reversal focusing Open
This letter explores the effect of the directivity of a source on time reversal acoustic focusing of energy. A single loudspeaker produces an airborne focus of sound in a reverberation chamber and in a classroom. Individual foci are create…
View article: Stress corrosion crack depth investigation using the time reversed elastic nonlinearity diagnostic
Stress corrosion crack depth investigation using the time reversed elastic nonlinearity diagnostic Open
Evidence of the ability to probe depth information of stress corrosion cracking (SCC) are presented using the time reversed elastic nonlinearity diagnostic (TREND). Depth estimation of SCC is important to determine when a stainless steel c…
View article: Three-dimensional time reversal communications in elastic media
Three-dimensional time reversal communications in elastic media Open
This letter presents a series of vibrational communication experiments, using time reversal, conducted on a set of cast iron pipes. Time reversal has been used to provide robust, private, and clean communications in many underwater acousti…
View article: Sound transmission measurements through porous screens
Sound transmission measurements through porous screens Open
The two microphone transfer function technique is used to measure sound transmission properties of porous screens or membranes in a plane wave tube. This paper will compare sound transmission of porous screens from several manufacturers. M…
View article: A laboratory experiment to test the limits of Bernoulli-Euler theory for flexural waves in bars
A laboratory experiment to test the limits of Bernoulli-Euler theory for flexural waves in bars Open
At Brigham Young University, one of the acoustics courses taught in the Physics and Astronomy Department focuses on resonance topics. This course is a graduate level course that uses a differential equation approach to wave motion and reso…
View article: Damage imaging in a laminated composite plate using an air-coupled time reversal mirror
Damage imaging in a laminated composite plate using an air-coupled time reversal mirror Open
We demonstrate the possibility of selectively imaging the features of a barely visible impact damage in a laminated composite plate by using an air-coupled time reversal mirror. The mirror consists of a number of piezoelectric transducers …
View article: Remote Whispering Applying Time Reversal
Remote Whispering Applying Time Reversal Open
The purpose of this project was to explore the use of time reversal technologies as a means for communication to a targeted individual or location. The idea is to have the privacy of whispering in one’s ear, but to do this remotely from lo…