Biodiesel is a renewable fuel that manufactured from vegetable oils and fat tissues. Biodiesel is mixed with diesel fuel and then is used in combustion engines. The main merit of biodiesel is its less pollution in comparison to pure diesel fuels. A significant property of diesel fuels during the combustion process is high noise and vibration. Worldwide many researchers worked on vibration of biodiesel and its blends with diesel. Consequently, in this study, evaluation of vibration was performed for biodiesel blends of the proportions ranged from 20% soybean oil to 80%. For this, a common rail diesel engine of capacity is 1248cc, was used. It has found that most of vibration accelerations were rising between 1800 and 2000 rpm. Results showed that the total vibration values are reduced significantly after servicing the engine by 12%. Statistical analysis of data showed that the vibration was lowest for B40 and B20. The results showed that the vibration of the diesel (D100) is less than biodiesel (B100). Finally, at different engine speeds, vibration was always consistent with power-torque curve.
Employees involved in various occupational environments that include vibration machines and any kind of vehicles are adversely subjected to multiple source noise. Thus, the corresponding noise frequencies (and mainly the infrasound ones) present high interest, especially from the viewpoint of sustainability, due to the potential effects on human safety and health (H_S&H) in sustainable engineering projects. Moreover, the occupational safety and health (OSH) visualization (a fact of unveiling the social dimension of sustainability) of occupational workplaces (by evaluating the infrasound and audible noise frequencies generated by diesel engines) could help a safety officer to lessen crucial risk factors in the OSH field and also to protect, more efficiently, the employees by taking the most essential safety measures. This study (i) suggests a technique to determine the infrasound and audible sound frequencies produced due to vibrations of diesel engines, by using biofuels (i.e., sustainable utilization of resources), in order to evaluate potential effects on human safety and health at the workplaces of sustainable engineering projects, and (ii) it ultimately aims to contribute to the improvement of the three “sustainability pillars” (economy, social, and environmental). Therefore, it provides experimental results of the frequency of the noise (regarding the infrasound and audible spectrum) that a diesel motor generates by vibration, in the frame of using different engine rpms (850, 1150, and 2000) and a variety of biofuel mixtures (B20-D80, B40-D60, B60-D40, and B80-D20). The article shows that the fuel blend meaningfully affects the generated noise, and more particularly, the usage of biofuel blends coming from mixing diesel oil with biodiesel (a fact of the emerging environmental dimension of sustainability) can produce various noise frequencies, which are determined in the infrasound and audible spectra (~10–23 Hz). The suggested technique, by ameliorating the OSH situation, doubtless will help enterprises to achieve the finest allocation of limited financial resources (a fact corresponding to the economic dimension of sustainability), allowing financial managers to have more available budget for implementing other risk-reduction projects.
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