本美国国家标准的这一部分规定了测量空气噪声的方法 乘小飞机？移动设备（AMD），如用于冷却电子、电气和机械设备的设备 对AMD的声功率级感兴趣的设备。这些AMD的例子包括螺旋桨风机、管道？轴流风扇，叶片？轴流风机、离心风机、， 机动叶轮及其变体。本美国国家标准的这一部分描述了测试仪器和测定方法 作为体积流量和风扇静压的函数，小型AMD发出的空气噪声 由AMD开发的测试仪器。它的目的是供AMD制造商使用 使用AMD冷却电子设备和类似应用的制造商，以及通过测试 实验室。它为AMD制造商、设备制造商和测试提供了一种方法 实验室获得可比结果。根据本部分进行的测量结果 本美国国家标准预计将用于工程信息和性能 验证，方法可在采购规范和买方与卖方之间的合同中引用 卖家。测量的最终目的是提供数据，以帮助电子设备的设计者， 包含一个或多个AMD的电气或机械设备。根据实验数据，给出了一种计算缩放管最大体积流量的方法 本美国国家标准本部分适用的全会。

This part of this American National Standard specifies methods for measuring the airborne noise emitted by small air?moving devices (AMDs), such as those used for cooling electronic, electrical, and mechanical equipment where the sound power level of the AMD is of interest.Examples of these AMDs include propeller fans, tube?axial fans, vane?axial fans, centrifugal fans, motorized impellers, and their variations.This part of this American National Standard describes the test apparatus and methods for determining the airborne noise emitted by small AMDs as a function of the volume flow rate and the fan static pressure developed by the AMD on the test apparatus. It is intended for use by AMD manufacturers, by manufacturers who use AMDs for cooling electronic equipment and similar applications, and by testing laboratories. It provides a method for AMD manufacturers, equipment manufacturers and testing laboratories to obtain comparable results. Results of measurements made in accordance with this part of this American National Standard are expected to be used for engineering information and performance verification, and the methods can be cited in purchase specifications and contracts between buyers and sellers. The ultimate purpose of the measurements is to provide data to assist the designers of electronic, electrical or mechanical equipment which contains one or more AMDs.Based on experimental data, a method is given for calculating the maximum volume flow rate of the scaled plenum up to which this part of this American National Standard is applicable.