Investigation on In-transit Injury of Farm Products

Vibrating Characteristcs and Injury of Pears in Carton Box

Abstract

The vibrating characteristics and vibration damage of pears and citrusunshiu in carton box were observed under simulated in-transit.
1) Tte softness of the pears expressed by loaddeflection ratios increased lineally with the magnitude of the acceleration:
Y=6.46X+5.2 (Fig. 4)
where X=magnitude of acceleration.
Y=softness.
2) The softness increased with the vibration frequencies and amplitudes. (Fig. 5 and 6)
3) The softness increased as the box was stacked higher, and one in the top box was twice as in the bottom. (Fig. 7)
4) In the case of the three stacked box, the resonance frequency of the box containing the pears were 300cpm. in the top, and 250cpm. both in the middle and bottom in vertical one. (Fig. 8)
5) The resonance frequency of the pears in the top box was 300cpm in both directions. (Fig. 9)
6) The ratio of acceleration of the pears to one of the carton box containing the pears were caluculated. The frequency of 300cpm. gave the maximum value of 1.7 and 1.55 in the top and middle, but minimum value of 0.7 in the bottom. (Fig. 10)
7) The acceleration ratio of the carton box containing the citrusunshiu to the vibrator did not exceed 1.0 in the range of forced vibration. (Fig 11. -1)
The resonant vibration of the citrus-unshiu occured at the frequency of 100cpm The value was smaller by 200cpm compared with one of pears.