Samadi Sadegh, Heidarbeigi Kobra
Mechanical Engineering of Biosystems Department, Ilam University, Ilam, Iran.
Heliyon. 2020 Oct 1;6(9):e05113. doi: 10.1016/j.heliyon.2020.e05113. eCollection 2020 Sep.
Fuels have important effects on the quality parameters of engines such as noise pollution and vibration. Diesel fuel are used in wide range of applications especially in compression ignition engines. The objective of the present research is evaluation of the noise emitted from a single-cylinder diesel engine using magnetized biodiesel-diesel fuel blends. In general, samples were provided with different percentages of the biodiesel-diesel blends as diesel (100, 95, 90, and 80%) and biodiesel (0, 5, 10, and 20%) by applying magnetic field (0, 5300 and 7000 G) to fuel line known as DxByMz. The measurements were done on a power tiller engine at a 10 cm distance from driver ear with three replications. The statistical approach in time domain and signal processing in frequency domain were applied for data analysis. The results of the variance analysis approved significant differences between the studied fuel blends and magnetic levels at 1% probability level. The highest and lowest average value of sound pressure level was corresponded to D100B0M0 and D80B20M5300, respectively. The results in frequency domain showed that the maximum sound pressure level values were in the frequency range of 31.5-200 Hz for all fuel blends and magnetic levels. The frequencies related to the maximum sound values varied by changing biodiesel percent and magnetic level.
燃料对发动机的质量参数有重要影响，如噪声污染和振动。柴油燃料被广泛应用于各种场合，尤其是在压燃式发动机中。本研究的目的是评估使用磁化生物柴油 - 柴油混合燃料的单缸柴油发动机发出的噪声。一般来说，通过对称为DxByMz的燃料管线施加磁场（0、5300和7000 G），提供不同百分比的生物柴油 - 柴油混合物样本，其中柴油占比为（100%、95%、90%和80%），生物柴油占比为（0%、5%、10%和20%）。测量是在一台动力耕耘机发动机上，在距驾驶员耳朵10厘米处进行，共重复三次。采用时域统计方法和频域信号处理方法进行数据分析。方差分析结果表明，在1%的概率水平下，所研究的燃料混合物和磁场强度之间存在显著差异。声压级的最高和最低平均值分别对应于D100B0M0和D80B20M5300。频域结果表明，所有燃料混合物和磁场强度下，最大声压级值都在31.5 - 200 Hz的频率范围内。与最大声音值相关的频率会随着生物柴油百分比和磁场强度的变化而变化。
