环境试验.第2-64部分:试验.试验Fh:振动、宽带随机(数控)和指南

[中文适用范围]： IEC 60068 的这一部分证明了样本在承受指定的随机振动测试要求时是否足以抵抗动态载荷，而不会导致其功能和/或结构完整性出现不可接受的退化。宽带随机振动可用于识别累积应力效应以及由此产生的机械弱点和指定性能的退化。该信息与相关规范一起可用于评估样本的可接受性。本标准适用于可能受到运输或操作环境（例如飞机、航天器和陆地车辆）引起的随机振动的样本。它主要用于未包装的标本以及运输容器中的物品（当后者可被视为标本本身的一部分时）。然而，如果物品被包装，则物品本身被称为产品，物品及其包装一起被称为测试样本。该标准可与 IEC 60068-2-47:2005 结合使用，用于测试包装产品。如果样本受到运输或现实生活环境（例如在飞机、航天器及其运输容器中的物品）产生的随机和确定性组合的振动，则纯随机测试可能不够。请参阅 IEC 60068-3-8:2003，估计样本的动态振动环境，并据此选择适当的测试方法。虽然主要用于电工样本，但本标准并不限于此，并且可以在需要的情况下用于其他领域（参见附录 A）。 [外文原描述]： IEC 60068-2-64:2008 demonstrates the adequacy of specimens to resist dynamic loads without unacceptable degradation of its functional and/or structural integrity when subjected to the specified random vibration test requirements. Broadband random vibration may be used to identify accumulated stress effects and the resulting mechanical weakness and degradation in the specified performance. This information, in conjunction with the relevant specification, may be used to assess the acceptability of specimens. This standard is applicable to specimens which may be subjected to vibration of a stochastic nature resulting from transportation or operational environments, for example in aircraft, space vehicles and land vehicles. It is primarily intended for unpackaged specimens, and for items in their transportation container when the latter may be considered as part of the specimen itself. However, if the item is packaged, then the item itself is referred to as a product and the item and its packaging together are referred to as a test specimen. This standard may be used in conjunction with IEC 60068-2-47:2005, for testing packaged products. If the specimens are subjected to vibration of a combination of random and deterministic nature resulting from transportation or real life environments, for example in aircraft, space vehicles and for items in their transportation container, testing with pure random may not be sufficient. See IEC 60068-3-8:2003 for estimating the dynamic vibration environment of the specimen and based on that, selecting the appropriate test method. The major changes with regard to the previous edition concern the removal of Method 1 and Method 2, replaced by a single method, and replacement of Annex A with suggested test spectra and removal of Annex C. Also included in this revision is the testing of soft packed specimens.