Visualization of pass-by noise by means of moving frame acoustic holography

Park, Soon-Hong; Kim, Yang-Hann

doi:10.1121/1.1404976

Cited by 48 publications

(20 citation statements)

References 9 publications

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“…Several attempts have been made to incorporate scanning microphone arrays in combination with acoustic holography algorithms [2][3][4][5][6]. However, the high cost of the tracking systems used and the complex setup needed for carrying out the experiments have limited the growth in popularity of this powerful measurement technique.…”

Section: Introductionmentioning

confidence: 99%

Scan and Paint: Theory and Practice of a Sound Field Visualization Method

Comesaña

Steltenpool

Pousa

et al. 2013

ISRN Mechanical Engineering

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Sound visualization techniques have played a key role in the development of acoustics throughout history. The development of measurement apparatus and techniques for displaying sound and vibration phenomena has provided excellent tools for building understanding about specific problems. Traditional methods, such as step-by-step measurements or simultaneous multichannel systems, have a strong tradeoff between time requirements, flexibility, and cost. However, if the sound field can be assumed time stationary, scanning methods allow us to assess variations across space with a single transducer, as long as the position of the sensor is known. The proposed technique, Scan and Paint, is based on the acquisition of sound pressure and particle velocity by manually moving a P-U probe (pressure-particle velocity sensors) across a sound field whilst filming the event with a camera. The sensor position is extracted by applying automatic color tracking to each frame of the recorded video. It is then possible to visualize sound variations across the space in terms of sound pressure, particle velocity, or acoustic intensity. In this paper, not only the theoretical foundations of the method, but also its practical applications are explored such as scanning transfer path analysis, source radiation characterization, operational deflection shapes, virtual phased arrays, material characterization, and acoustic intensity vector field mapping.

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Section: Introductionmentioning

confidence: 99%

Scan and Paint: Theory and Practice of a Sound Field Visualization Method

Comesaña

Steltenpool

Pousa

et al. 2013

ISRN Mechanical Engineering

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“…12-13 [23] provide a visualisation of the noise emission for an engine mounted in the vehicle, which illustrates about sound radiation characteristics of the engine in the pass-by noise test. Figs.…”

Section: Engine Noisementioning

confidence: 99%

“…The moving frame acoustic holography (MFAH) method is applied in order to analyse vehicle tyre sound radiation under different pass-by conditions [23]. Figs.…”

Section: Tyre/road Noisementioning

confidence: 99%

Noise source characteristics in the ISO 362 vehicle pass-by noise test: Literature review

et al. 2013

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A B S T R A C TSince many people are exposed to road traffic noise in urban areas, current legislation aims to limit vehicle noise emissions. In Europe, the vehicle pass-by noise test is implemented according to the international standard ISO 362. As a result of more recent investigations of urban traffic, a revision to the ISO 362 standard has been proposed that includes a constantspeed test in addition to the traditional accelerated test in order to determine the pass-by noise value. To ensure compliance with the pass-by noise test vehicle manufacturers and suppliers must quantify vehicle noise source characteristics during the design stage of the vehicle. In addition, predictive tools need to be available during the product development phase in order to estimate the final pass-by noise level. In this paper an extensive literature survey is presented of noise source characteristics in the ISO 362 vehicle pass-by noise test. Vehicle pass-by noise is analysed in the time and frequency domains and a ranking of the noise source contributions is established. The characteristics of the four major noise sources (engine, intake system, exhaust system, tyre/road system) contributing to pass-by noise as well as current prediction methods are reviewed.

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“…One of the essential reasons discovered in a comprehensive investigation is vehicle exterior noise in the pass-by driving manoeuvre (Park, Kim, 2001), which is an awful burden to people resulting in annoyance, sleep disturbance, or cardiovascular disease (Okokon et al, 2015). Governments in European countries have already revised the standard ISO 362, which is stringent for the environmental protection, regulation of emissions control of vehicle pass-by noise (Braun et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A Fast Method of Feature Extraction for Lowering Vehicle Pass-By Noise Based on Nonnegative Tucker3 Decomposition

Wang

Guo

Deng

et al. 2017

Archives of Acoustics

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Usually, the judgement of one type fault of vehicle pass-by noise is difficult for engineers, especially when some significant features are disturbed by other interference noise, such as the squealing noise is almost simultaneous with the whistle in the exhaust system. In order to cope with this problem, a new method, with the antinoise ability of the algorithm on the condition by which the features are entangled, is developed to extract clear features for the fault analysis. In the proposed method, the nonnegative Tucker3 decomposition (NTD) with fast updating algorithm, signed as NTD FUP, can find out the natural frequency of the parts/components from the exhaust system. Not only does the NTD FUP extract clear features from the confused noise, but also it is superior to the traditional methods in practice. Then, an aluminium-foil alloy material, which is used for the heat shield for its lower noise radiation, replaces the aluminium alloy alone. Extensive experiments show that the sound pressure level of the vehicle pass-by noise is reduced 0.9 dB(A) by the improved heat shield, which is also considered as a more lightweight design for the exhaust system of an automobile.

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Visualization of pass-by noise by means of moving frame acoustic holography

Cited by 48 publications

References 9 publications

Scan and Paint: Theory and Practice of a Sound Field Visualization Method

Scan and Paint: Theory and Practice of a Sound Field Visualization Method

Noise source characteristics in the ISO 362 vehicle pass-by noise test: Literature review

A Fast Method of Feature Extraction for Lowering Vehicle Pass-By Noise Based on Nonnegative Tucker3 Decomposition

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