henry rice

Trinity College Dublin, Mechanical and Manufacturing Engineering, Faculty Member

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Address: Dublin, Leinster, Ireland

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Tarbiat Modares University

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Alfonso Gómez Espinosa

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Papers by henry rice

Reproducibility of sound-absorbing periodic porous materials using additive manufacturing technologies: Round robin study

Additive Manufacturing

Development of acoustic “meta-liners” providing sub-wavelength absorption

International Journal of Aeroacoustics

The sound absorptive performance of a proposed “meta-liner” are investigated in this paper. The s... more The sound absorptive performance of a proposed “meta-liner” are investigated in this paper. The structure is composed of closely placed plates connected by openings at alternating locations in a stacked format. This system presents multiple band gaps with high absorption and sub-wavelength behaviour (sample thickness equals 0.04 λ), achieved through tortuosity within the design. The acoustic response of the single layer is obtained numerically and with experimental verification under normal incidence. The repeating cellular design allows efficiencies in the viscothermal numerical analysis and using a transfer matrix approach, it is demonstrated that the response of the overall system may be efficiently predicted from a detailed model of a unit cell. Both the transfer matrix method and a full viscothermal model are validated against experimental data as a function of system depth. The analysis gives very satisfactory results which could form the basis for future designs.

The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial

International Journal of Polymer Science

Advancements in 3D print technology now allow the printing of structured acoustic absorbent mater... more Advancements in 3D print technology now allow the printing of structured acoustic absorbent materials at the appropriate microscopic scale and sample sizes. The repeatability of the fundamental cell unit of these metamaterials provides a pathway for the development of viable macro models to simulate built-up structures based on detailed models of the individual cell units; however, verification of such models on actual manufactured structures presents a challenge. In this paper, a design concept for an acoustic benchmark metamaterial consisting of an interlinked network of resonant chambers is considered. The form chosen is periodic with cubes incorporating spherical internal cavities connected through cylindrical openings on each face of the cube. This design is amenable to both numerical modelling and manufacture through additive techniques whilst yielding interesting acoustic behaviour. The paper reports on the design, manufacture, modelling, and experimental validation of these ...

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Steady State Response Prediction of General Linear Structures Coupled by Local Nonlinear Elements

Journal of Vibration and Acoustics

This short paper is concerned with a direct application of the techniques developed by the author... more

On an Innovative Method of Modeling General Nonlinear Mechanical Systems, Part 1: Theory and Numerical Simulations

Journal of Vibration and Acoustics

This is the first part of a paper on an innovative approach of studying general nonlinear structu... more This is the first part of a paper on an innovative approach of studying general nonlinear structural dynamic systems. In this part, the theoretical background and some numerical simulations are presented. Firstly, a frequency domain nonlinear compensation method is proposed. It can be used to recover the linear path of a general non-linear system as long as the Volterra expansion is held between the input and the output. Secondly, a new nonlinear element location scheme is developed based on the system linear path identification. Lastly, as a natural extension in the development of the contents of this paper, an in-situ nonlinear restoring force state mapping technique is proposed. The use of these new methods is demonstrated through several numerical examples of either single or multiple DOF systems incorporating some typical types of nonlinearities.

The Measurement of Nonlinear Damping in Single-Degree-of-Freedom Systems

Journal of Vibration and Acoustics

The measurement and correct modelling of damping is of crucial importance in the prediction of th... more The measurement and correct modelling of damping is of crucial importance in the prediction of the dynamical performance of systems for a wide range of engineering applications. In most cases, however, the experimental methods used to measure damping coefficients are extremely basic and, in general, poorly reported. This paper shows that damping is a deceptive parameter which is prone to subtle nonlinear distortion which often appears to satisfy general linear criteria. An efficient experimental method which provides for the measurement of both the linear and nonlinear damping for a single-degree-of-freedom system is proposed. The results from a numerical simulation study of a model with “drag” type quadratic damping are shown to give reliable estimates of parameters of the system when both random and impulse excitation techniques are used.

Broadband Noise Prediction of Open Rotors Using Semi-Empirical Methods Informed by CFD Calculations

22nd AIAA/CEAS Aeroacoustics Conference, 2016

Aerodynamic noise prediction for a wind turbine using numerical flow simulations and semi-empirical modelling approaches

22nd AIAA/CEAS Aeroacoustics Conference, 2016

A lighthill based jet noise model for acoustic shielding prediction

The compression curves of different models of cochlear nonlinearities (Abstract)

The Journal of the Acoustical Society of America, May 1, 2004

ABSTRACT A widely used method for representing the nonlinear response of the basilar membrane (BM... more ABSTRACT A widely used method for representing the nonlinear response of the basilar membrane (BM) is a graph of log amplitude of the BM motion against the log amplitude of the sinusoidal driving pressure, known as the input-output level curve. At low sound pressure levels (less than approximately 30 dB) the level of the BM response rises with sound pressure level at a slope of about 1 dB/dB, indicating a linear response. Above this region the slope of the level curve decreases, typically to about 1/2 to 1/3 dB/dB, indicating a compressive nonlinearity. Various models for cochlear nonlinearity will be presented, particularly contrasting the characteristics and behavior of an instantaneously acting nonlinear function and those of level-dependent systems. Both of these models have been used historically to model the nonlinearities present in the cochlea. Comparisons will be made between the properties of these models, highlighting potential methods of distinguishing between them. Similar nonlinear responses to those of the BM are observed in otoacoustic emissions. Experimental results will be reported which attempt to distinguish between the instantaneously acting and level-dependent models of this nonlinearity, which suggest that the latter is more likely.

Investigation of a jet noise shielding methodology

Aiaa Journal, 2015

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Optimised virtual loudspeaker reproduction

IET Irish Signals and Systems Conference (ISSC 2010), 2010

Abstract In this paper we present a method for spatial audio reproduction over headphones using... more

How Might People Near National Roads Be Affected by Traffic Noise as Electric Vehicles Increase in Number? A Laboratory Study of Subjective Evaluations of Environmental Noise

PloS one, 2016

We face a likely shift to electric vehicles (EVs) but the environmental and human consequences of... more We face a likely shift to electric vehicles (EVs) but the environmental and human consequences of this are not yet well understood. Simulated auditory traffic scenes were synthesized from recordings of real conventional and EVs. These sounded similar to what might be heard by a person near a major national road. Versions of the simulation had 0%, 20%, 40%, 60%, 80% and 100% EVs. Participants heard the auditory scenes in random order, rating each on five perceptual dimensions such as pleasant-unpleasant and relaxing-stressful. Ratings of traffic noise were, overall, towards the negative end of these scales, but improved significantly when there were high proportions of EVs in the traffic mix, particularly when there were 80% or 100% EVs. This suggests a shift towards a high proportion of EVs is likely to improve the subjective experiences of people exposed to traffic noise from major roads. The effects were not a simple result of EVs being quieter: ratings of bandpass-filtered versio...

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Implementation of the forward-advancing wave expansion method (FWEM) for numerical solution of three dimensional large-scale sound propagation problems

A jet noise source model for acoustic shielding prediction based on Lighthill’s analogy

Journal of Sound and Vibration, 2011

$Research paper thumbnail of Jet noise shielding : Mean flow convection and refraction effects on jet noise source propagation$

Jet noise shielding : Mean flow convection and refraction effects on jet noise source propagation

Acoustic Shielding in Low Mach Number Potential Flow Incorporating a Wake Model Using BEM

Depth perception in interactive virual acoustic environments using higher order ambisonic soundfields

In this paper, we present an investigation into the perception of source depth in interactive vir... more In this paper, we present an investigation into the perception of source depth in interactive virtual auditory environments in the context of Higher Order Ambisonic (HOA) reproduction. In particular, we investigate the accuracy of soundfield reproduction over virtual loudspeakers (headphone reproduction) with increasing Ambisonic order. Performance of 1 st , 2 nd and 3 rd order Ambisonics in representing distance cues is assessed in subjective audio perception tests. Results demonstrate that first order soundfields are sufficient in representing distance cues for virtual loudspeaker reproduction.

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Analysis of non-linear squeeze film dynamics. Part I. Physical theory and modelling

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

ABSTRACT

A boundary integral method for noise shielding analysis in non-conventional aircraft configurations

Reproducibility of sound-absorbing periodic porous materials using additive manufacturing technologies: Round robin study

Additive Manufacturing

Development of acoustic “meta-liners” providing sub-wavelength absorption

International Journal of Aeroacoustics

The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial

International Journal of Polymer Science

Download

Steady State Response Prediction of General Linear Structures Coupled by Local Nonlinear Elements

Journal of Vibration and Acoustics

This short paper is concerned with a direct application of the techniques developed by the author... more

On an Innovative Method of Modeling General Nonlinear Mechanical Systems, Part 1: Theory and Numerical Simulations

Journal of Vibration and Acoustics

The Measurement of Nonlinear Damping in Single-Degree-of-Freedom Systems

Journal of Vibration and Acoustics

Broadband Noise Prediction of Open Rotors Using Semi-Empirical Methods Informed by CFD Calculations

22nd AIAA/CEAS Aeroacoustics Conference, 2016

Aerodynamic noise prediction for a wind turbine using numerical flow simulations and semi-empirical modelling approaches

22nd AIAA/CEAS Aeroacoustics Conference, 2016

A lighthill based jet noise model for acoustic shielding prediction

The compression curves of different models of cochlear nonlinearities (Abstract)

The Journal of the Acoustical Society of America, May 1, 2004

Investigation of a jet noise shielding methodology

Aiaa Journal, 2015

Download

Optimised virtual loudspeaker reproduction

IET Irish Signals and Systems Conference (ISSC 2010), 2010

Abstract In this paper we present a method for spatial audio reproduction over headphones using... more

How Might People Near National Roads Be Affected by Traffic Noise as Electric Vehicles Increase in Number? A Laboratory Study of Subjective Evaluations of Environmental Noise

PloS one, 2016

Download

Implementation of the forward-advancing wave expansion method (FWEM) for numerical solution of three dimensional large-scale sound propagation problems

A jet noise source model for acoustic shielding prediction based on Lighthill’s analogy

Journal of Sound and Vibration, 2011

$Research paper thumbnail of Jet noise shielding : Mean flow convection and refraction effects on jet noise source propagation$

Jet noise shielding : Mean flow convection and refraction effects on jet noise source propagation

Acoustic Shielding in Low Mach Number Potential Flow Incorporating a Wake Model Using BEM

Depth perception in interactive virual acoustic environments using higher order ambisonic soundfields

Download

Analysis of non-linear squeeze film dynamics. Part I. Physical theory and modelling

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

ABSTRACT

A boundary integral method for noise shielding analysis in non-conventional aircraft configurations

henry rice

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