本规程包括三个级别的风机结构分析:初始结构完整性。汽车测试。C耐久性（实验室）试验方法。“初始结构完整性”一节介绍了用于预测潜在共振以及可能的疲劳累积的分析和测试方法。车内（或机器）部分列举了用于进行风扇应变计测试的一般程序。已经描述了可能影响应变计数据结果的各种注意事项，供本程序的用户根据特定应用进行调整/放弃。 耐久性试验方法一节描述了实验室环境的详细试验程序，可根据风扇类型、设备可用性和最终目标使用。第二级和第三级基于上一级的信息。对于不同车辆环境或新风扇设计的每个级别的适用性，需要进行工程判断。本SAE推荐规程适用于任何发动机冷却风扇应用，包括中型和重型- 载重卡车、公共汽车、建筑设备、工业和农业设备。有些章节更适用于发动机驱动的风扇，而不是液压驱动或电机驱动的风扇，尤其是在速度控制方面。然而，无论驾驶模式如何，风扇故障模式通常是相同的。非金属结构的使用需要金属设计不需要的评估区域。其中最主要的是极端温度、含水量、抗冲击性、化学侵蚀性、材料纯度/均匀性和老化/风化。 影响金属和非金属风机的评估领域包括固有频率测定和耐久性测试，但对非金属零件的评估方法有所不同。

Three levels of fan structural analysis are included in this practice:aInitial structural integrity.bIn-vehicle testing.cDurability (laboratory) test methods.The initial structural integrity section describes analytical and test methods used to predict potential resonance and, therefore, possible fatigue accumulation.The in-vehicle (or machine) section enumerates the general procedure used to conduct a fan strain gage test. Various considerations that may affect the outcome of strain gage data have been described for the user of this procedure to adapt/discard depending on the particular application.The durability test methods section describes the detailed test procedures for a laboratory environment that may be used depending on type of fan, equipment availability, and end objective.The second and third levels build upon information derived from the previous level. Engineering judgment is required as to the applicability of each level to a different vehicle environment or a new fan design.This SAE Recommended Practice is applicable to any engine cooling fan application including medium and heavy-duty trucks, buses, construction equipment, industrial, and agricultural equipment. Some sections are more applicable to engine-driven fans than to hydraulic-driven or electric-motor-driven fans, especially with respect to speed control. Fan failure modes, however, are generally the same regardless of driving modes.The usage of non-metallic construction necessitates areas of evaluation not required by metallic designs. Chief among these are temperature extremes, moisture content, impact resistance, chemical attack, material purity/homogeneity, and aging/weathering. Areas of evaluation affecting both metallic and non-metallic fans, but requiring somewhat different approaches with non-metallic parts, include natural frequency determination and durability testing.