Problems and Developments in Automotive Engine Noise Research

Priede, T.

doi:10.4271/790205

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…For instance, it has to fix a pressure sensor on the cylinder head of a test engine for in-cylinder pressure measurement. Hence, airborne acoustic and/or vibration measurement has a potential to be used for engine condition monitoring and combustion diagnosis [13][14][15][16]. As airborne acoustic sensor is not only easy to install in real application but also measured with more comprehensive information in a remote way.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic measurements for the combustion diagnosis of diesel engines fuelled with biodiesels

Zhen

Wang

et al. 2013

Meas. Sci. Technol.

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In this paper, an experimental investigation was carried out on the combustion process of a compression ignition (CI) engine running with biodiesel blends under steady state operating conditions. The effects of biodiesel on the combustion process and engine dynamics were analysed for non-intrusive combustion diagnosis based on a four-cylinder, four-stroke, direct injection and turbocharged diesel engine. The signals of vibration, acoustic and in-cylinder pressure were measured simultaneously to find their inter-connection for diagnostic feature extraction. It was found that the sound energy level increases with the increase of engine load and speed, and the sound characteristics are closely correlated to the variation of in-cylinder pressure and combustion process. The continuous wavelet transform (CWT) was employed to analyse the non-stationary nature of engine noise in a higher frequency range. Before the wavelet analysis, time synchronous average (TSA) was used to enhance the signal-to-noise ratio (SNR) of acoustic signal by suppressing the components which are asynchronous. Based on the root mean square (RMS) values of CWT coefficients, the effects of biodiesel fractions and operating conditions (speed and load) on combustion process and engine dynamics were investigated. The result leads to the potential of airborne acoustic measurements and analysis for engine condition monitoring and fuel quality evaluation.

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Section: Introductionmentioning

confidence: 99%

“…They concluded that the noise of the low-frequency band is mainly the machinery noise, while the noise of high-frequency band is mainly combustion. Most engine noise is produced by the combustion process and slight portion of noise is contributed by the injector, the intake and exhaust valves [15].…”

Section: Introductionmentioning

confidence: 99%

Acoustic measurements for the combustion diagnosis of diesel engines fuelled with biodiesels

Zhen

Wang

et al. 2013

Meas. Sci. Technol.

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“…Although there are a number of engine noise sources, one of the most fundamentals is the combustion-induced noise [3]. It occurs towards the end of the compression stroke and subsequent expansion stroke.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Noise From Diesel Engines Using the Independent Component Analysis

Ball

et al. 2001

Mechanical Systems and Signal Processing

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“…(Priede, 1979) (Brunt et al, 1998). Shu and Liang (Shu and Liang, 2007) analysed the complex engine noises using coherent power spectrum technology, and found that the engine noise at the low frequency band are the primarily resources of machinery noise, in contrast to combustion induced noise are mainly located in the high frequency band.…”

Section: Introductionmentioning

confidence: 99%

Combustion Noise Analysis for Combustion and Fuels Diagnosis of a Compression Ignition Diesel Engine Operating with Biodiesels

Zhen

Song

Shi

et al. 2015

Combustion Science and Technology

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In this paper, the combustion noise of a compression ignition (CI) diesel engine operating with biodiesels has been investigated experimentally. It aims to explore an effective method for combustion process monitoring and fuel quality evaluation through analysing the characteristics of the engine combustion noise. The experiments were conducted on a four-cylinder, four-stroke, direct injection and turbocharged diesel engine fuelled with biodiesels (B50 and B100) and normal pure diesel, and operating under different loads and speeds. The signals of cylinder head vibration, engine noise and in-cylinder pressure were measured during the tests. A coherent power spectrum analysis method was used to investigate the vibration and noise signals that related to the combustion process. The results shown that the noise components at the frequency band of 2 -3 kHz are closely related to the combustion process. Subsequently, the Wigner-Ville distribution is employed to present the energy distribution of engine noise in the time-frequency domain. Then a band-pass filter based on fractional Fourier transform (FRFT) is developed to extract the main component of the combustion noise for feature extraction. The results show that the sound pressure levels (SPLs) of the extracted combustion noise of the test diesel engine fuelled with biodiesels are higher than that fuelled with diesel. This is also identical to the variation of in-cylinder pressure. The results demonstrate that the features of the extracted combustion noise can indicate the combustion characteristics and provide useful information for monitoring the combustion process and evaluating the fuel quality of diesel engines.

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Problems and Developments in Automotive Engine Noise Research

Cited by 20 publications

References 5 publications

Acoustic measurements for the combustion diagnosis of diesel engines fuelled with biodiesels

Acoustic measurements for the combustion diagnosis of diesel engines fuelled with biodiesels

A Study of the Noise From Diesel Engines Using the Independent Component Analysis

Combustion Noise Analysis for Combustion and Fuels Diagnosis of a Compression Ignition Diesel Engine Operating with Biodiesels

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