Experimental and regression analysis of noise and vibration of a compression ignition engine fuelled with various biodiesels

Noise and vibration of ignition compression engine is one of the most complicated field to cope with since every mechanism that compose of the engine affect them separately. In this study, effect of various biodiesel on engine noise and vibration has been studied on an unmodified compression ignition engine. Linear and non-linear based regression analysis based models were also developed to predict the relationship between fuel properties and noise–vibration of the engine with excellent agreement. The results revealed that noise and vibration of the engine decreased with increasing biodiesel ratio until pure biodiesel usage and in linear regression analysis, correlation coefficient (R) values were 0.784 and 0.741 for vibration and sound pressure level, correspondingly. In non-linear regression analysis, correlation coefficient (R) values were 0.814 and 0.777 for vibration and sound pressure level, correspondingly. In linear regression analysis, mean absolute percentage error (MAPE) values were 0.747% and 0.126% for vibration and sound pressure level, correspondingly. In non-linear regression analysis, mean absolute percentage error (MAPE) values were 0. 682% and 0.342% for vibration and sound pressure level, respectively.