Analysis for Vibration Characteristics of the Watermelon for Optimum Packaging Design in Domestic Distribution

국내 유통 수박의 적정 포장설계를 위한 진동특성 분석

Shock and vibration inputs are transmitted from the transporting vehicle through the packaging to the fruit. The vibration causes sustained bouncing of fruits against each other and the container wall. The steady state vibration input may cause serous fruit injury, and the damage is particularly severe if the fruits are bounced at its resonance frequency. The determination of the resonance frequencies of the fruits and vegetables may help the packaging designer to determine the proper packaging system providing adequate protection for the fruits, and to understand the complex interaction between the components of the fruits when they relate to expected transportation vibration inputs. To analyze the vibration properties of the watermelon for optimum packaging design during transportation, sinusoidal sweep vibration tests were carried out. The resonance frequency of the watermelon ranged from 19 to 32 Hz and the amplitude at resonance was between 1.6 and 2.9 G. The resonance frequency and amplitude at resonance frequency band of the watermelon decreased with the increase of the sample mass. The multiple nonlinear regression equation for predicting the resonance frequency of the watermelon were developed using the independent variables such as mass, input acceleration and sphericity.