Transactions of the ASAE vol:39 issue:3 pages:1057-1065
'Galia' melons were measured for their physical properties including shape and firmness, as well as the relation between the static and dynamic elastic modulus of the melon flesh. A four-layer linear elastic finite element (FE) model of the melon was established. Four mode shapes were found to exist, Of these, the breathing mode is typical for melons and the remaining three modes are common to other fruits. The stiffness factors f(2)m and f(2)m(2/3) can be used to evaluate the melon firmness where f is their resonant frequency and m the melon mass. The former(f(2)m) is for the melons that are similar in size while the later (f(2)m(2/3)) is for the melons that are similar in density but differ considerably in size. Influence of the watercore on the mode shapes and corresponding resonant frequencies was investigated, Qualitative detection of these defects is possible by monitoring the change of the mode shapes.