Application of accelerometers for sensing combustion phasing of an advanced combustion engine

Massey, Jeffery A.; Wagner, R. M.; Drallmeier, J. A.

doi:10.1177/1468087411411639

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Also, they reported that the coherence at frequencies above approximately 4 kHz decreases with a retard in combustion timing, which is agreeable with our findings. 22…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

Ahmadian

Najafi

Ghobadian

et al. 2019

International Journal of Engine Research

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The understanding of noise generation and source identification is vital in noise control. This research was conducted to experimentally evaluate combustion-induced noise and vibration using coherence and wavelet coherence estimates. A single-cylinder direct-injection diesel engine was chosen for experimental investigation. The independent variables for conducting experiments were injection timing with five levels of 22, 27, 32 (normal), 37, and 42 crank angles before the top dead center, and also the engine torque load with four levels of 55%, 70%, 85%, and 100% of the rated value. The signals of cylinder pressure, liner acceleration, and radiated sound pressure of the test engine were measured and recorded. Then, coherency and wavelet coherency experiments were carried out between cylinder pressure and liner acceleration, cylinder pressure and sound pressure, and liner acceleration and sound pressure signals in MATLAB software. The results indicated that increasing load would increase wavelet coherency between cylinder pressure and liner acceleration signals at frequencies higher than 1 kHz. The coherent regions between cylinder pressure and sound pressure signals were mainly at frequencies higher than 1 kHz while advancing the fuel injection timing had shifted the coherency toward lower frequencies. In general, with advancing injection timing, the coherent regions between liner acceleration and sound pressure signals have appeared at broader time ranges, especially at frequencies between 100 and 500 Hz. Comparing the results of the wavelet coherency and coherency tests, we concluded that wavelet coherency is a more accurate and descriptive tool in evaluating the combustion-induced noise and vibration.

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“…Also, they reported that the coherence at frequencies above approximately 4 kHz decreases with a retard in combustion timing, which is agreeable with our findings. 22…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

Ahmadian

Najafi

Ghobadian

et al. 2019

International Journal of Engine Research

View full text Add to dashboard Cite

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“…Massey et al 11 have recently shown for a HCCI engine that there can be equivalently high linear coherence between the surface accelerations and cylinder pressure for both cavity resonances and the lower frequencies (<4 kHz) related to the combustion PRR. The surface accelerations displace the air adjacent to the engine surface resulting in noise radiation from the engine.…”

Section: Introductionmentioning

confidence: 99%

Identification of the dominant combustion characteristics on homogeneous charge compression ignition engine noise

Massey

Drallmeier

2014

International Journal of Engine Research

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The upper load range of homogeneous charge compression ignition engines is limited by extreme noise levels. Previous studies have investigated the sources of this noise by investigating high-frequency (>4 kHz) acoustic energy typically associated with cylinder cavity resonances excited during high in-cylinder pressure rise rate combustion events. In this work, a broader frequency band (0.5–15 kHz) is investigated experimentally for a single-cylinder homogeneous charge compression ignition engine inside an acoustic sub-enclosure. It has been found that the 0.5–4-kHz frequency band being excited by the rapid in-cylinder pressure rise rate of the homogeneous charge compression ignition combustion event is dominating the acoustic signature of the engine. This indicates that the noise is generated from the structural response of the engine structure to the impulse-like load from the rapid cylinder pressure rise rather than ringing associated with the cavity resonances. A band-level analysis is used to explore the contribution of mechanical and combustion noise on the acoustic signature for various load conditions and combustion phasings. Based on this analysis, a method is proposed where a cylinder pressure rise rate threshold is established for determining the point at which the homogeneous charge compression ignition combustion noise will significantly exceed the mechanical noise level. This threshold, based on the theoretical band-level analysis, agrees with thresholds found from previous literature.

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Increasing knock detection sensitivity by combining knock sensor signal with a control oriented combustion model

Plá

Bares

Jiménez

et al. 2022

Mechanical Systems and Signal Processing

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Application of accelerometers for sensing combustion phasing of an advanced combustion engine

Cited by 6 publications

References 16 publications

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

Identification of the dominant combustion characteristics on homogeneous charge compression ignition engine noise

Increasing knock detection sensitivity by combining knock sensor signal with a control oriented combustion model

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