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Journal ArticleDOI

Correlation of cylinder pressure–based engine noise metrics to measured microphone data:

TL;DR: In this article, peak pressure rise rate, ringing intensity, and combustion noise analysis are typically cited measures of the noise generated by combustion in an internal combustion engine, and they are used to measure the amount of combustion noise produced by the engine.
Abstract: Peak pressure rise rate, ringing intensity, and combustion noise analysis are typically cited measures of the noise generated by combustion in an internal combustion engine. In this publication, pe...
Citations
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Journal ArticleDOI
TL;DR: In this paper, it has been demonstrated that achieving low temperature combustion with diesel fuel over a wide range of conditions is difficult because of its properties, namely, low volatility and high chemical reactivity.
Abstract: Many research studies have shown that low temperature combustion in compression ignition engines has the ability to yield ultra-low NOx and soot emissions while maintaining high thermal efficiency. To achieve low temperature combustion, sufficient mixing time between the fuel and air in a globally dilute environment is required, thereby avoiding fuel-rich regions and reducing peak combustion temperatures, which significantly reduces soot and NOx formation, respectively. It has been demonstrated that achieving low temperature combustion with diesel fuel over a wide range of conditions is difficult because of its properties, namely, low volatility and high chemical reactivity. On the contrary, gasoline has a high volatility and low chemical reactivity, meaning it is easier to achieve the amount of premixing time required prior to autoignition to achieve low temperature combustion. In order to achieve low temperature combustion while meeting other constraints, such as low pressure rise rates and maintaining ...

108 citations


Cites methods from "Correlation of cylinder pressure–ba..."

  • ...This parameter is of interest because it has been shown to be the primary driver in combustion-generated noise in engines.86,87 In addition, the combustion noise level (CNL) is shown, which was calculated using the algorithm put forward by Shahlari et al.88 Considering these are closed-cycle simulation results, an algorithm also put forward by Shahlari et al.89 was used to calculate the full four-stroke cycle noise from closed-cycle simulation results....

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  • ...Considering these are closed-cycle simulation results, an algorithm also put forward by Shahlari et al.(89) was used to calculate the full four-stroke cycle noise from closed-cycle simulation results....

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Journal ArticleDOI
TL;DR: In this paper, an automotive-size single-cylinder common-rail diesel engine was modified to fit an additional high-pressure hydrogen injector in the cylinder head to circumvent the pre-ignition and knocking limitations inherent to port fuel-injection hydrogen engines.

46 citations

Journal ArticleDOI
15 Apr 2017-Energy
TL;DR: In this paper, an artificial neural network (ANN) model was used to predict combustion noise level (CNL) for a 0.3-L converted-diesel HCCI engine and a large amount of experimental data at cyclic and steady-state operating conditions were used to evaluate the ANN noise level model.

34 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of biodiesel applications on diesel engines, including the impact on engine performance, combustion characteristics, emission characteristics, vibration, noise characteristics, and compatibility, are discussed.
Abstract: Since the advent of biodiesel as a renewable alternative fuel, it has attracted wide attention from researchers. The raw materials of biodiesel generally produced by transesterification of animal fats, plants, algae or even waste cooking oil, which makes full use of natural resources and alleviates increasingly problematic oil shortages and environmental pollution. Biodiesel can be directly applied to vehicle engines without any modification and will both improve the combustion quality of the engine and reduce the harmful emissions from the engine. This study mainly summarizes the influence of biodiesel applications on diesel engines, including the impact on engine performance, combustion characteristics, emission characteristics, vibration, noise characteristics, and compatibility. In particular, unregulated emissions such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs), which are rarely mentioned in other review articles, are also discussed in this study.

31 citations

Journal ArticleDOI
01 Jan 2019-Fuel
TL;DR: In this paper, a single-cylinder automotive-size gasoline compression ignition (GCI) engine running on a double-injection mode was investigated, where both the first injection proportion and fuel ignition quality were varied considering their expected influence on premixed charge preparation.

27 citations

References
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Book
01 Jan 1989
TL;DR: In this paper, the authors provide a thorough treatment of the fundamental theorems and properties of discrete-time linear systems, filtering, sampling, and discrete time Fourier analysis.
Abstract: For senior/graduate-level courses in Discrete-Time Signal Processing. THE definitive, authoritative text on DSP -- ideal for those with an introductory-level knowledge of signals and systems. Written by prominent, DSP pioneers, it provides thorough treatment of the fundamental theorems and properties of discrete-time linear systems, filtering, sampling, and discrete-time Fourier Analysis. By focusing on the general and universal concepts in discrete-time signal processing, it remains vital and relevant to the new challenges arising in the field --without limiting itself to specific technologies with relatively short life spans.

10,388 citations

Journal ArticleDOI
TL;DR: In this article, a fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency, which is demonstrated in a heavy-duty test engine over a range of loads.
Abstract: A fuel reactivity controlled compression ignition (RCCI) concept is demonstrated as a promising method to achieve high efficiency – clean combustion. Engine experiments were performed in a heavy-duty test engine over a range of loads. Additionally, RCCI engine experiments were compared to conventional diesel engine experiments. Detailed computational fluid dynamics modelling was then used to explain the experimentally observed trends. Specifically, it was found that RCCI combustion is capable of operating over a wide range of engine loads with near zero levels of NOx and soot, acceptable pressure rise rate and ringing intensity, and very high indicated efficiency. For example, a peak gross indicated efficiency of 56 per cent was observed at 9.3 bar indicated mean effective pressure and 1300 rev/min. The comparison between RCCI and conventional diesel showed a reduction in NOx by three orders of magnitude, a reduction in soot by a factor of six, and an increase in gross indicated efficiency of 16.4 per cen...

707 citations

Journal ArticleDOI
TL;DR: The internal-combustion engine in theory and practice is discussed in this paper, where the internal combustion engine is described as a two-stage engine with two cylinders and two combustion chambers.
Abstract: The internal-combustion engine in theory and practice , The internal-combustion engine in theory and practice , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

666 citations


Additional excerpts

  • ...838 International J of Engine Research 16(7)...

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  • ...844 International J of Engine Research 16(7)...

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  • ...836 International J of Engine Research 16(7)...

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  • ...832 International J of Engine Research 16(7)...

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  • ...840 International J of Engine Research 16(7)...

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Proceedings ArticleDOI
J. A. Eng1
21 Oct 2002

451 citations

Trending Questions (1)
How to connect noise buds to laptop?

Combustion noise analysis provided the best correlation to microphone noise, especially at lower speeds where engine noise is dominated by combustion noise rather than mechanical noise.