Vibration Analysis of a Common Rail Diesel Engine using Biodiesel: A Case Study

Abstract

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.

Potential Effects on Human Safety and Health from Infrasound and Audible Frequencies Generated by Vibrations of Diesel Engines Using Biofuel Blends at the Workplaces of Sustainable Engineering Systems

“…In other words, the experiments, and, consequently, the resulted measurements, showed that mixed fuels can produce frequencies that are close to infrasound (see Figures 6-18, panels a,b). Besides, potential factors that can affect vibration, and, subsequently, generate infrasound frequencies, are the oxygen percentage in fuel compounds, together with the process of spraying and fuel injection [26][27][28][29][30]. As specified by the graphs, whenever the biofuel proportion was increased, it caused infrasound production, with frequencies below 20 Hz (for instance, see Figures 17b and 18a,b).…”

“…As specified by the graphs, whenever the biofuel proportion was increased, it caused infrasound production, with frequencies below 20 Hz (for instance, see Figures 17b and 18a,b). According to the work of Chaitidis et al [26], increasing the biofuel content of the mixture leads to a reduced vibration energy. Furthermore, when the engine rpm rosed (reduced), the energy of vibrations were decreased (increased), and consequently, the generated infrasound phenomenon was lessened (enhanced), as it could be inferred by the comparison between (i) the curves of the Figures 6a, 7a and 8a; (ii) the graphs of the Figures 9a, 10a and 11a; and (ii) the curves of the Figures 12a, 13a and 14a.…”

“…Moreover, possible factors that can affect vibration, and thereafter generate infrasound noise, are the oxygen percentage in fuel compounds, together with the process of spraying and fuel injection [26][27][28][29][30]. In the work of Taghizadeh-Alisaraei et al [31], there was a vibration analysis of a diesel engine using biodiesel and diesel fuel blends, wherein the results showed that the levels of the engine vibration varied considerably, in a way consistent with the composition of the fuel mixture.…”