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Transport Vibration Laboratory Simulation: On the Necessity of Multiaxis Testing

机译：运输振动实验室仿真：多轴测试的必要性

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Nowadays, the packaging industry, like many other sectors, is coping with new demands resulting from financial and environmental constraints. The importance of accurate laboratory simulation of transport vibration as a tool for packaging optimization is therefore increasing, as is highlighted by the International Safe Transit Association testing procedures (ISTA series). In this context, many studies can be found in the literature focusing on the special nature of transport vibrations, analysing the most suitable power spectral density profiles related to route and vehicle characteristics and the best statistical description for acceleration in order to achieve realistic simulation in the laboratory. Most of these works deal only with vertical vibrations because of the of the high energy content such vibrations represent, and only a limited number also analyse longitudinal and transversal acceleration spectra. This paper describes a non-comprehensive set of measurements in real transport situations with the purpose of providing an initial description of the six-degrees-of-freedom vibration produced inside a truck trailer. In addition, the importance of non-vertical random excitation is investigated in the laboratory by means of a multiaxis shaker table used to study the difference in the dynamic response of corrugated containers in stacked shipping units. The results show that the amount of energy neglected using only vertical testing procedures can be significant, and that the packaging bending modes are not excited as they would be in a real transport situation. This demonstrates the necessity of multiaxis testing.
机译：如今，包装行业与许多其他行业一样，正在应对由于财务和环境限制而产生的新需求。因此，正如国际安全运输协会的测试程序（ISTA系列）所强调的那样，精确的运输振动实验室模拟作为包装优化工具的重要性正在提高。在这种情况下，可以在文献中找到许多研究，这些研究集中于运输振动的特殊性质，分析与路线和车辆特性有关的最合适的功率谱密度分布图，以及对加速度的最佳统计描述，以便在运输过程中实现逼真的仿真。实验室。这些工作中的大多数都只处理垂直振动，因为这种振动所代表的能量很高，而且只有极少数的数据可以分析纵向和横向加速度谱。本文描述了一组在实际运输情况下的非全面测量，目的是对卡车拖车内部产生的六自由度振动进行初步描述。此外，在实验室中通过多轴振动台研究非垂直随机激励的重要性，该振动台用于研究堆叠式运输单元中瓦楞纸箱的动态响应差异。结果表明，仅使用垂直测试程序就可以忽略大量的能量，并且包装弯曲模式不会像在实际运输情况下那样受到激发。这证明了多轴测试的必要性。

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