Acoustics

Thompson, Lonny L.; Pinsky, Peter M.

doi:10.1002/0470091355.ecm046

Cited by 8 publications

(4 citation statements)

References 86 publications

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“…Consider the exterior scattering problem [Thompson and Pinsky 2004], a solid three-dimensional object A immersed in an unbounded air volume (see Figure 2(a)). Considering only time-harmonic vibrations, with angular frequency ω and a homogeneous medium with constant speed of sound c, acoustic wave propagation can be expressed as a boundary value problem for the Helmholtz equation…”

Section: The Equivalent Source Methodsmentioning

confidence: 99%

Wave-based sound propagation in large open scenes using an equivalent source formulation

et al. 2013

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We present a novel approach for wave-based sound propagation suitable for large, open spaces spanning hundreds of meters, with a small memory footprint. The scene is decomposed into disjoint rigid objects. The free-field acoustic behavior of each object is captured by a compact per-object transfer function relating the amplitudes of a set of incoming equivalent sources to outgoing equivalent sources. Pairwise acoustic interactions between objects are computed analytically to yield compact inter-object transfer functions. The global sound field accounting for all orders of interaction is computed using these transfer functions. The runtime system uses fast summation over the outgoing equivalent source amplitudes for all objects to auralize the sound field for a moving listener in real time. We demonstrate realistic acoustic effects such as diffraction, low-passed sound behind obstructions, focusing, scattering, high-order reflections, and echoes on a variety of scenes.

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Section: The Equivalent Source Methodsmentioning

confidence: 99%

Wave-based sound propagation in large open scenes using an equivalent source formulation

et al. 2013

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“…For mathematical and computational foundations of acoustics, see [269,328]. Physiology and psychoacoustics are covered in [223,370] and Chapters 4 and 5 of [207].…”

Section: Further Readingmentioning

confidence: 99%

Toolkit for Immersive Virtual Simulators With Biofeedback

Грибова¹,

Strekalev²

2020

vkit

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The architecture of the instrumental complex for the creation and reproduction of immersive virtual simulators using biological feedback is proposed. An overview of existing solutions such as tools for the development and reproduction of virtual simulators is considered. The analysis of the use of virtual reality in different areas such as aircraft control, parachute jumping, various medical procedures, and operations which require preliminary preparation is considered. The concept of an immersive virtual simulator with biological feedback has been introduced. The use of virtual reality and biological feedback equipment as well as the applicability of the software-hardware complex in the field of interaction and control of objects of the virtual environment based on the state of a person and the state of objects are determined within its framework. The following principles of the instrumental complex development based on the use of the ontological approach are proposed: the use of various mechanisms to describe the learning scenario, the support for various control mechanisms of the simulator, the inclusion of specialists of different profiles in the development process of the simulator, and the automatic generation of the components of the virtual environment based on the declarative model of the virtual simulator to simplify the creation of a virtual environment. The description of the architecture and all interested participants is provided. The connections between the participants and the components of the tool complex are shown. The information and software components of the instrumental complex aimed at automating the process of creation, launch, control, and monitoring based on biological feedback are considered. A complex of ontologies is described: the ontology of an immersive virtual simulator with biological feedback and the ontology of knowledge about human states. The interfaces of the instrumental complex are demonstrated, such as interfaces of the equipment editor, monitoring tools, and launching tools.

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“…The artificial truncation boundary t , however, requires some special treatment in order to prevent or to reduce the spurious reflections of waves. The three most commonly used treatments are [15,16,28] 1. The application of absorbing boundary conditions, 2.…”

Section: Treatment Of Unbounded Domainsmentioning

confidence: 99%

Trefftz-Based Methods for Time-Harmonic Acoustics

Pluymers

Hal

Vandepitte

et al. 2007

Arch Computat Methods Eng

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Over the last decade, Computer Aided Engineering (CAE) tools have become essential in the assessment and optimization of the acoustic characteristics of products and processes. The possibility of evaluating these characteristics on virtual prototypes at almost any stage of the design process reduces the need for very expensive and time consuming physical prototype testing. However, despite their steady improvements and extensions, CAE techniques are still primarily used by analysis specialists. In order to turn them into easy-to-use, versatile tools that are also easily accessible for designers, several bottlenecks have to be resolved. The latter include, amongst others, the lack of efficient numerical techniques for solving system-level functional performance models in a wide frequency range. This paper reviews the CAE modelling techniques which can be used for the analysis of time-harmonic acoustic problems and focusses on techniques which have the Trefftz approach as baseline methodology. The basic properties of the different methods are highlighted and their strengths and limitations are discussed. Furthermore, an overview is given of the state-of-the-art of the extensions and the enhancements which have been recently investigated to enlarge the application range of the different techniques. Specific attention is paid to one very promising Trefftz-based technique, which is the so-called wave based method. This method has all the necessary attributes for putting a next step in the evolution towards truly virtual product design.

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Acoustics

Cited by 8 publications

References 86 publications

Wave-based sound propagation in large open scenes using an equivalent source formulation

Wave-based sound propagation in large open scenes using an equivalent source formulation

Toolkit for Immersive Virtual Simulators With Biofeedback

Trefftz-Based Methods for Time-Harmonic Acoustics

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