Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine

Zheng, Xu; Zhou, Nan; Zhou, Quan; Qiu, Yi; Liu, Ruijun; Zhou, Hao

doi:10.3390/en13040871

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…Katrasnik et al (Katrasnik et al, 2006) developed a new criterion for the determination of the start of combustion (SOC) from the diesel engine in-cylinder pressure diagram based on the maximum of the thirdorder derivative of the cylinder pressure with respect to the crank angle. Zheng et al (Zheng et al, 2020) found that the energy of high-frequency oscillation reached peak at medium-high speed and increased with engine load and rail pressure.…”

Section: Literature Reviewmentioning

confidence: 99%

Assessment of in-cylinder pressure in diesel engines using novel combustion indices

et al. 2021

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Efficient monitoring of combustion process is a key for regulating emissions from engine as well as achieving fuel economy. Various non-intrusive methods of diagnosis for engines include monitoring of noise, and vibrations emitted are attractive options that are cheap, reliable, and need no modifications in the engine set up under test. Combustion process occurring inside combustion chamber of engine provides important information about cyclic efficiency, heat losses, as well as noise and vibration (NVH) performance of engines. Earlier NVH aspects were thought to closely correlate with the development of in-cylinder pressure inside combustion chamber. However, there have been contradictions to this idea prompting the need for further evaluations. The presented work discusses a novel methodology that may be used for analysis of in-cylinder pressure development during the combustion process for a diesel engine. The in-cylinder pressure development in a small-sized diesel engine was analyzed with the aim to extract information about various indicators that characterize the development of combustion processes. Novel indices were developed based on noise, pressure, and vibrations signature of engines , which were much more correlated to combustion process development. The correlative relationship shows the effectiveness of the proposed methodology for condition monitoring for engines.

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Section: Literature Reviewmentioning

confidence: 99%

Assessment of in-cylinder pressure in diesel engines using novel combustion indices

et al. 2021

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“…Notwithstanding, SPE is often used as membrane in proton exchange membrane fuel cell (PEMFC) application. PEMFC offers high energy efficiency (>80%), benign environment and reduced noise pollution comparing to diesel engines [ 3 ]. Other applications of polymer electrolyte based on ionic liquid can be found in solar-driven steam [ 4 ] and supercapacitor [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

The Influences of 1-Butyl-3-Methylimidazolium Tetrafluoroborate on Electrochemical, Thermal and Structural Studies as Ionic Liquid Gel Polymer Electrolyte

et al. 2021

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After decades of development, ionic liquid gel polymer electrolytes (ILGPEs) are currently experiencing a renaissance as a promising electrolyte to be used in electrochemical devices. Their inherent tendency towards poor electrochemical properties have limited their applications and commercialization activities. Henceforth, gel polymer electrolyte (GPE) is being introduced to alleviate the abovementioned issues. In this work, the assessment of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4] in poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) to form ILGPE was done. The relationship of [BMIM][BF4] towards the dielectric properties at different wt. % ratios and temperature was ascertained. The results indicated that [BMIM]BF4 is able to facilitate fast conduction. Moreover, it was found that [BMIM][BF4] could serve as an effective agent in reducing crystallinity and glass transition temperature of the polymer and thus enhanced the ionic conductivity of the samples. Notwithstanding, the ILGPE sample possessed a high thermal stability up to 300 °C and good electrochemical stability of 4.2 V which are beneficial for operation in electrochemical devices. All in all, the correlation between the ionic liquid chemistry and electrochemical performances could provide a valuable insight to rational selection and design for ILGPE electrolytes.

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“…Moreover, the applications of EMD are also restricted due to the existence of the end effect and mode mixing [2]. Zheng et al [3] proposed an adaptive cyclic average method based on the TVF-EMD to extract high-frequency oscillation characteristics, from which the cyclic number can be adaptively determined. The local mean decomposition (LMD), a development of the EMD, decomposes the signal into a series of product functions [4,5].…”

Section: Introductionmentioning

confidence: 99%

A parameter-adaptive variational mode decomposition approach based on weighted fuzzy-distribution entropy for noise source separation

Zhou

Zhang

Zhou

et al. 2020

Meas. Sci. Technol.

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Due to limitations in the generalisation ability of currently proposed improved variational mode decomposition (VMD) methods, it is hard to precisely and efficiently discern signal characteristics from different power systems. Meanwhile, it is difficult to separate non-order noise sources in current studies. To address this issue, a novel scheme is proposed based on parameter-adaptive VMD and partial coherence analysis (PCA) for separating noise sources. In this approach, weighted fuzzy-distribution entropy (FuzzDistEn) is constructed to optimise the VMD to adaptively obtain the optimal parameters, considering the complexity of the signal system, and the mutual information between the decomposition components and the original signal. To verify the effectiveness and superiority of the proposed method, the paper respectively compares the decomposition results of the simulated signal using different objective functions, and shows that the weighted FuzzDistEn has a better decomposition effect. For the other issue, PCA is adapted to estimate the coherence between component vibration and radiated noise. In a case study, the parameter-adaptive VMD-PCA approach is implemented in a diesel engine noise identification field based on bench experiments. The results show that the proposed method can successfully separate five surface radiated noise sources. The research offers a new perspective on feature extraction problems.

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Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine

Cited by 7 publications

References 39 publications

Assessment of in-cylinder pressure in diesel engines using novel combustion indices

Assessment of in-cylinder pressure in diesel engines using novel combustion indices

The Influences of 1-Butyl-3-Methylimidazolium Tetrafluoroborate on Electrochemical, Thermal and Structural Studies as Ionic Liquid Gel Polymer Electrolyte

A parameter-adaptive variational mode decomposition approach based on weighted fuzzy-distribution entropy for noise source separation

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