Input impedance measurement of a narrow pipe with thermal gradient

Zaker, Ashkan; Gibiat, Vincent; Guilain, Stéphane

doi:10.1121/1.5133387

Cited by 2 publications

(1 citation statement)

References 42 publications

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“…Another paper [23] presents a method of measuring the responses to a non-stationary sound impulse using professional acoustic equipment and identifying the signals by means of a recursive least-squares algorithm. Acoustic measurement in the design of internal combustion machines is a typical application for improving their performance [24]. The chillers in these systems impose a longitudinal thermal gradient on the air enclosed in narrow channels.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench

Moreno-Ramírez

Iniesta

González

2020

Sensors

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Existing acoustic test benches are usually costly devices based on proprietary designs, sensors, and acquisition devices. In this paper, a low-cost test bench for acoustic purposes is introduced. The design of the test bench takes into account not only the low-cost mechanical design, but also uses low-cost sensors and control boards. This test bench has been designed for a range of signals compatible with those used by thermoacoustic engines, but it can be useful for applications with similar requirements. Taking advantage of an auxiliary pressure reference, low-cost unidirectional differential pressure sensors can be used to significantly increase the accuracy of the sampling system. The acoustic and mechanical design and development are presented along with the sampling system and the sensors arrangement implemented. Both the sensor and sampling system are evaluated by comparison with a high-fidelity sound acquisition system. An unexpected effect on the time error values distribution of the low-cost acquisition system is found and described. Finally, the errors introduced by the system and the sensors in terms of time and pressure sampling are characterized. As a result, the low-cost system’s accuracy has been satisfactory assessed and validated for the conditions expected in thermoacoustic experiments in terms of frequency and dynamic pressure.

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Section: Introductionmentioning

confidence: 99%

Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench

Moreno-Ramírez

Iniesta

González

2020

Sensors

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An experimental analysis of acoustic input impedance of a narrow pipe with low Mach number flow and thermal gradient

Zaker

Gibiat

Guilain

et al. 2020

The Journal of the Acoustical Society of America

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In this paper, the normalized acoustic input impedance of a narrow pipe with a strong axially non-homogeneous thermal profile subjected to low Mach number flow of up to 0.03 M is studied. The analysis is done experimentally, using the two-microphone three-calibration technique and the results are compared with numerical simulations, using an industrial finite element package. The main application of this study is in the acoustic design of water-cooled charge-air coolers in internal combustion engines. The measurements are done on an effectively semi-infinite narrow pipe. It is shown that neglecting the flow effect in the calibration process of narrow pipes can significantly increase the measurement error. The results show that although the direct modification of the normalized acoustic input impedance due to low Mach number flow is negligible, the flow exerts an indirect but significant effect on this parameter by modifying the thermal gradient profile. Therefore, taking this effect into account can help to achieve an improved acoustical design of engine intake lines.

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Input impedance measurement of a narrow pipe with thermal gradient

Cited by 2 publications

References 42 publications

Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench

Development and Characterization of a Low-Cost Sensors System for an Acoustic Test Bench

An experimental analysis of acoustic input impedance of a narrow pipe with low Mach number flow and thermal gradient

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