International Journal of Engineering Mathematics / 2014 / Article / Tab 4

Research Article

Quadratic Prediction Models for the Performance Comparison of a Marine Engine Fuelled with Biodiesels B5 and B20

Table 4

Accuracy check of the quadratic prediction model for biodiesel B5.

Speed (rpm)Torque-B5 (Nm)Error
Measured valuePredicted value(Nm)PercentageAbsolute percentage

1000785.10786.771.670.21%0.21%
1100735.28740.164.880.66%0.66%
1200640.12621.52−18.60−2.91%2.91%
1300415.10430.8515.753.79%3.79%
1400171.89168.14−3.75−2.18%2.18%

Average or mean0.008−0.083%1.95%

Interpretation99.917% accuracyExcellent prediction