Results 61 to 70 of about 9,039,126 (121)

High resolution near-field acoustic holography

, 2004
High resolution Near-field Acoustic Holography (NAH) is not a widely discussed topic in open literature. For instance articles on automotive or naval applications do not discuss resolutions beyond one centimetre. Electronic appliances on the other hand demand a high spatial resolution, since the components of printed circuit boards become smaller and ...
Scholte, R., Roozen, N.B.
openaire   +1 more source

Truncated aperture extrapolation for Fourier-based near-field acoustic holography by means of border-padding

, 2009
Although near-field acoustic holography (NAH) is recognized as a powerful and extremely fast acoustic imaging method based on the inverse solution of the wave-equation, its practical implementation has suffered from problems with the use of the discrete ...
Lopez Arteaga, Ines,, Lopez, I Ines, Scholte, R., N. Bert Roozen, Roozen, NB Bert, Bert Roozen, N., Nijmeijer, H., Lopez Arteaga, I., Ines Lopez, Nijmeijer, H Henk, Roozen, N.B., Rick Scholte, Scholte, R Rick, Henk Nijmeijer   +13 more
core   +1 more source

Cyclostationary Near-field Acoustic Holography for Gearboxes

Jixie chuandong
Regarding the problem that the traditional near-field acoustic holography (NAH) has difficulty in reconstructing the sound field of the gearbox, this work makes full use of the cyclostationary characteristics of the radiated noise and combines the cyclostationary signal analysis with the equivalent source NAH algorithm to develop a sound imaging method
Zhu Song, Zhang Erliang, Gao Xiaoyu
openaire   +1 more source

Numerical techniques for near-field acoustic holography

, 2019
Near-field acoustic holography (NAH) has proved to be an enormously successful sound source identification technique, which is widely used in field of acoustics and noise control. The work presented in this thesis aims at developing a novel method for modelling near-field acoustic holography, where the particle velocity on the surface of a vibrating ...
openaire  

A comparison of inverse boundary element method and near-field acoustical holography

, 1999
An inverse boundary element method (IBEM) is used to estimate the surface velocity of a rolling tyre from measurements of the near-field pressure. Subsequently, the sound pressure is calculated over a finite plane surface next to the tyre from the ...
Hald, Jørgen, Schuhmacher, Andreas, Saemann, E.-U.   +2 more
core  

ACOUSTICAL HOLOGRAPHY FOR VISUALIZATION OF SOUND

, 2008
: This project deals with simulation, comparison and optimisation of different methods for near field array visualisation of the sound fields. These methods are based on principles of the Near Field Acoustical Holography (NAH).
Petr Grätz
core  

Measuring under non stationary conditions with scanning techniques

, 2012
Fernandez Comesana, Daniel, Morales Cervera, Sandra, Takeuchi, Takashi, Holland, Keith R.   +3 more
core   +1 more source

Visualization of Vibration and Sound by Near-field Acoustical Holography

The Journal of the INCE of Japan, 1998
openaire   +1 more source

Measuring musical instruments directivity patterns with scanning techniques

, 2012
Fernandez Comesana, Daniel, Morales Cervera, Sandra, Takeuchi, Takashi, Holland, Keith R.   +3 more
core   +1 more source

Helicopter cabin interior noise assessment using Scan & Paint Transfer Path Analysis

, 2012
Fernandez Comesana, Daniel, de Bree, Hans-Elias, Garcia Escribano, Dolores   +2 more
core   +1 more source