Robustness of a model predicting drop-testing performance of fruit packs

Abstract

In an earlier investigation a numerical model was defined which summarized the effects on apple packs of multiple drops from different heights. The results suggested that a given package-type could be associated with a "package constant", k, characteristic of the package and independent of the drop height and the number of drops. The effect on k of change in experimental conditions and material is investigated; it is shown that the model is remarkably robust under such changes, and is equally applicable to pears. The results suggest, however, that k may be affected by flesh firmness and state of maturity of the fruit, and this possibility requires further specific investigation. Two methods of calculating k are described and compared, and restrictions on the calculations noted; the methods are shown to be in good agreement.