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

机译：柴油机燃用生物柴油燃烧噪声分析及燃油诊断

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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.
机译：在本文中，已经对使用生物柴油的压缩点火（CI）柴油发动机的燃烧噪声进行了实验研究。通过分析发动机燃烧噪声的特征，旨在探索一种有效的方法来进行燃烧过程监测和燃料质量评估。实验是在以生物柴油（B50和B100）和普通纯柴油为燃料的四缸，四冲程，直喷和涡轮增压柴油机上进行的，并在不同的负载和速度下运行。在测试过程中测量了气缸盖振动，发动机噪音和缸内压力的信号。相干功率谱分析方法用于研究与燃烧过程有关的振动和噪声信号。结果表明，2 -3 kHz频段的噪声成分与燃烧过程密切相关。随后，采用Wigner-Ville分布在时频域中表示发动机噪声的能量分布。然后，基于分数阶傅立叶变换（FRFT）的带通滤波器被开发出来，以提取燃烧噪声的主要成分进行特征提取。结果表明，以生物柴油为燃料的试验柴油机提取的燃烧噪声的声压级（SPLs）高于以柴油为燃料的柴油机。这也与缸内压力的变化相同。结果表明，提取的燃烧噪声特征可以指示燃烧特性，并为监测燃烧过程和评估柴油机的燃料质量提供有用的信息。

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