Direct Sound Radiation Testing on a Mounted Car Engine

Comesaña, Daniel Fernández; Tijs, Emiel; Kim, Daewoon

doi:10.4271/2014-01-2088

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…In [24,25] it has already been shown that the sound radiation from the engine and the tyres can also be measured successfully with pup robes. Measurements directly at the exhaust opening are difficult because of the high temperatures involved, but this problem can be circumvented by installing the probes at some distance from the exhaust where it is less hot.…”

Section: Discussionmentioning

confidence: 98%

Measurement of Sound Pressure Contributions in Pass-By-Noise Tests Using Particle Velocity Sensors

Pignol¹,

Tijs²,

Comesaña³

2016

Acta Acustica united with Acustica

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In conventional pass-by-noise tests, the vehicle noise emission levelisdetermined with amicrophone at aspecifieddistance from atest track while the vehicle drivesby. Although these tests offer asimple approach to assess the overall performance, theydonot yield information about the sources of noise distributed across the vehicle. Methods to determine the influence of local excitations can be useful for manufacturs attempting to apply an effective noise reduction treatment. Acoustic beamforming methods can be applied at high frequencies for moving structures to locate noise, butthey have difficulties quantifying the impact of each source on the sound pressure next to the test track. In this paper,amethod is presented to determine the sound pressure contributions using apanel noise approach based on direct measurements of particle velocity.The sound pressure contribution for separate car positions is calculated by combining the sound radiation and the acoustic transfer path. The time-averaged result, representing the sound radiated from avehicle driving by,isultimately obtained by spatially averaging the contributions at these positions. To validate the methodology,am easurement wasp erformed with as et of loudspeakers mounted on ac ar.T he measurement method and test results are presented, and the advantages and limitations of the novelmethod are discussed.

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Section: Discussionmentioning

confidence: 98%

Measurement of Sound Pressure Contributions in Pass-By-Noise Tests Using Particle Velocity Sensors

Pignol¹,

Tijs²,

Comesaña³

2016

Acta Acustica united with Acustica

Self Cite

View full text Add to dashboard Cite

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“…In addition to the above-mentioned methods, there are a number of extensive measurement and analytical techniques for the analysis of acoustic sources inside the car, such as transfer path analysis (TPA) [10], acoustic holography using spherical microphone arrays [11], multi-layer matrices for measuring interior fragments [5] or scanning methods [2,4]. The last method that can be mentioned is the multi-sensor intensity analysis [3]. All the above-mentioned methods have their strengths, but also very serious limitations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of acoustic propagation of automotive cooler during run up and run down

Paluch¹,

Kłaczyński²

2021

Diagnostyka

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The modern automotive industry invests more and more in electric drive technology. As a result, new challenges arise in terms of vibroacoustic optimization of the car interior. Components that were once masked by the internal combustion engine are starting to dominate the interior of vehicles. There is therefore a great need for noise reduction. For this purpose, a number of methods of its reduction are used, i.e. component optimization (source), use of active noise reduction systems or passive soundproofing materials. In order to perform the abovementioned noise reduction measures, appropriate measurements and signal analysis should be carried out. This presentation aims to present the measurement of an automotive air cooler in transient states on the stand. Measurements were made using a 3D intensity probe based on the direct measurement of the acoustic particle velocity, in 3 planes in front of the cooler. Then, order tracking analysis was performed for the run-up and coast-down. The results in the form of selected orders of intensity and acoustic particle velocity were compared with classical results made with the use of a microphone at the same measurement points locations.

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“…Thus, the direction of sound propagation can be obtained by measuring the direction of acoustic particle velocity. TAPVS shows promising properties for applications in sound source localization [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ], such as engine fault detection [ 14 , 15 , 16 , 17 ], gunshot localization [ 18 , 19 ], and pipe leakage acoustic detection [ 7 , 20 ] etc., which is far superior to microphone arrays for its higher orientation accuracy, smaller size, simpler signal processing [ 21 ], wider working temperature range [ 22 ], lower low frequency self-noise [ 4 , 23 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Sensitivity Enhancement Package for MEMS-Based Thermal Acoustic Particle Velocity Sensor

Chang

Yang

Zhu

et al. 2021

Sensors

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In this paper, small-sized acoustic horns, the sensitivity enhancement package for the MEMS-based thermal acoustic particle velocity sensor, have been designed and optimized. Four kinds of acoustic horns, including tube horn, double cone horn, double paradox horn, and exponential horn, were analyzed through numerical calculation. Considering both the amplification factor and effective length of amplification zone, a small-sized double cone horn with middle tube is designed and further optimized. A three-wire thermal acoustic particle velocity sensor was fabricated and packaged in the 3D printed double cone tube (DCT) horn. Experiment results show that an amplification factor of 6.63 at 600 Hz and 6.93 at 1 kHz was achieved. A good 8-shape directivity pattern was also obtained for the optimized DCT horn with the lateral inhibition ratio of 50.3 dB. No additional noise was introduced, demonstrating the DCT horn’s potential in improving the sensitivity of acoustic particle velocity sensors.

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Direct Sound Radiation Testing on a Mounted Car Engine

Cited by 4 publications

References 2 publications

Measurement of Sound Pressure Contributions in Pass-By-Noise Tests Using Particle Velocity Sensors

Measurement of Sound Pressure Contributions in Pass-By-Noise Tests Using Particle Velocity Sensors

Analysis of acoustic propagation of automotive cooler during run up and run down

Design and Optimization of Sensitivity Enhancement Package for MEMS-Based Thermal Acoustic Particle Velocity Sensor

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