Abstract Mechanical damage in packaged fruits is known to be exacerbated by the intensity and exposure duration of vibration excitation during road transport. However, the current single degree of freedom (SDOF) vibration simulation test standards for road vehicle transport have limitations for simulating long distance road trips. The accelerated vibration simulation testing, based on the Basquin model of cyclic fatigue, has been used for reducing the simulation test time. However, the time-compression factor used in this model can result in significant errors in simulation outcome as the power constant is usually assumed (i.e. k = 2 or 5). This work aimed at developing an accelerated vibration simulation test for packaged bananas. For this, mechanical damage levels that occurred during the field transport of packaged bananas were compared with the damage levels resulted from laboratory-based vibration simulation. A SDOF averaged power-spectra derived from the measurement of vertical acceleration levels during the field transport, with a vibration intensity of 0.36 gRMS for a test duration of three hours, was found to be the most suitable test protocol that closely replicated the field damage levels during long distance transport of bananas. The power constant in the Basquin model was derived by comparing the simulation-induced mechanical damage levels, with those occurred during the field transport. This study therefore provides a practical time-compressed simulation test for packaged bananas and other similar products undergoing long distance transport. Improved package testing will contribute to developing more realistic solutions to minimize damage to delicate products in-transit.

中文翻译：

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开发包装香蕉的加速振动模拟测试

摘要 众所周知，在公路运输过程中，振动激发的强度和暴露持续时间会加剧包装水果的机械损伤。然而，现行的道路车辆运输单自由度（SDOF）振动模拟测试标准在模拟长途公路旅行方面存在局限性。基于循环疲劳的Basquin模型的加速振动仿真试验已被用于减少仿真试验时间。然而，由于通常假定功率常数（即 k = 2 或 5），因此该模型中使用的时间压缩因子可能会导致仿真结果出现重大错误。这项工作旨在开发一种用于包装香蕉的加速振动模拟测试。为了这，将包装香蕉的现场运输过程中发生的机械损坏水平与基于实验室的振动模拟产生的损坏水平进行了比较。从现场运输过程中垂直加速度水平的测量得出的单自由度平均功率谱，在三个小时的测试持续时间内，振动强度为 0.36 gRMS，被发现是最合适的测试协议，它密切复制了现场损坏水平在香蕉的长途运输过程中。Basquin 模型中的功率常数是通过将模拟引起的机械损伤水平与现场运输过程中发生的机械损伤水平进行比较得出的。因此，本研究为包装香蕉和其他类似产品的长途运输提供了实用的时间压缩模拟测试。