Abstract
The effect of vibration frequency and directions on the damage of strawberries was evaluated under the acceleration level less than 1.0G. Under vertical vibration, the transmissibility between fruits and vibration table showed dependency on both acceleration and frequency, and the higher acceleration tended to cause a lower peak value and peak shift to lower frequency. Transmissibilities were found to be 1.0, 4.2, 2.6 for 5, 20, 30Hz at 0.6G, respectively. The damage degree of strawberries after vibration treatment showed similar pattern (20Hz>30Hz>>5Hz) as transmissibilities. On the other hand, strawberries were more damaged by horizontal vibration than vertical. These results indicate that damage occurrence of strawberries is affected by not only the acceleration level but also transmissibility and/or vibration direction.
