International Journal of Engineering Mathematics / 2014 / Article / Tab 5

Research Article

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

Table 5

Accuracy check of the quadratic prediction model for biodiesel B20.

Speed (rpm)Torque-B20 (Nm)Error
Measured valuePredicted value(Nm)PercentageAbsolute percentage

1000739.11739.630.520.07%0.07%
1100688.80695.887.081.03%1.03%
1200610.73580.09−30.64−5.02%5.02%
1300354.38392.2837.9010.69%10.69%
1400147.30132.43−14.87−10.10%10.10%

Mean0.004−0.664%5.381%

Interpretation99.336% accuracyExcellent prediction