Investigation of the accuracy of non-linear model in the study of green permeability of green sand moulds

Aondona P. Ihom, Awele M. Allen, Emmanuel I. Nwonye, Chukwunwendu Ilochionwu and Joy N. Ogbodo

African Journal of Engineering Research
Published: February 18 2014
Volume 2, Issue 1
Pages 14-20

Abstract

The study, “investigation of the accuracy of non linear model in the study of green permeability of green sand moulds” has been carried out. The nonlinear model used in the work is based on the hyperbolic function. The work used results generated empirically from the Sand Testing Laboratory of National Metallurgical Development Centre, Jos. Non-linear models were developed for the study and prediction of green permeability. Green permeability was the dependent variable while clay content and moisture content were the independent variables. The developed models were tested for accuracy both in terms of interpreting the relationship existing between green permeability and the two variables and in predicting green permeability. It was found that this model failed in terms of accuracy. A graphical version of the model was developed from the model equations and it was found that the non-linear model was completely different in shape and form from the graphical model of the green permeability generated empirically. While the later conformed to existing theories on permeability, the former did not. The study has clearly established the inaccuracy of nonlinear model based on hyperbolic function for prediction of green permeability and analysis of relationship between green permeability and the two variables of clay content and moisture content in green sand moulds.

Keywords: Accuracy, nonlinear models, permeability, moulds, investigation.

Full Text PDF