نتایج جستجو برای: acoustic array

تعداد نتایج: 216552  

2010
Jeffrey S. Rogers Leslie Collins Loren Nolte Douglas Nowacek Matthew Reynolds

Electrical Engineering 0544) Localization of Dynamic Acoustic Sources with a Maneuverable Array

Journal: :The Journal of the Acoustical Society of America 1994

Journal: :The Journal of the Acoustical Society of America 1984

Journal: :The Journal of the Acoustical Society of America 2007
Finn Jacobsen Virginie Jaud

Statistically optimized near field acoustic holography (SONAH) differs from conventional near field acoustic holography (NAH) by avoiding spatial Fourier transforms; the processing is done directly in the spatial domain. The main advantage of SONAH compared with NAH is that the usual requirement of a measurement aperture that extends well beyond the source can be relaxed. Both NAH and SONAH are...

2013
Xiaoxia Yang Shili Chen Fang Sun Shijiu Jin Wenshuang Chang

Ultrasonic phased array inspection technology is widely used in nondestructive evaluation (NDE) applications and it has been proved to be an effective method for flaw detections in industry. In our study, this nondestructive evaluation method is proposed to detect the corrosion defects on engine cylinders. In order to demonstrate its feasibility, it is necessary to study the characteristics of ...

2011
Natsuda Laokulrat Yasushige Maeda Masanori Sugimoto

The paper describes a 3D acoustic imaging system that uses a 2D receiver array and a 2D transmitter array. For many years, high quality acoustic imaging has been achieved by using synthetic transmit aperture (STA) technique [1][2]. Normally, STA uses an array of receivers and a small number of transmitters to produce an image. However, the conventional arrangement of transmitters in a same hori...

2013
MARTIN PAPEZ KAREL VLCEK Tomas Bata

Sound sources can be localized and analysed using phased microphone arrays.Beamforming is a method for processing microphone array data to produce images that represent the distribution of the acoustic source strength.It is an imaging technique that applies to continuous or discrete source distribution.A microphone array can be designed to be more sensitive to the sound coming from one or more ...

2009
Kam W. Lo Brian G. Ferguson

A nonlinear least-squares (LS) method is formulated to estimate the speed and the closest-point-of-approach (CPA) time and range of a ground vehicle whose broadband acoustic energy emissions are received by a ground-based wideaperture planar acoustic sensor array of unknown shape. It is assumed that the vehicle travels at a constant speed in a straight line. The three estimated motion parameter...

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