ANSI/ASA S12第7部分。9系列介绍了测量低频的注意事项和独特技术 户外有风时的噪音（LFN）。对于风力发电机组来说，在风中进行测量是必要的 项目以及无数其他无法控制环境风速的工业电力和设施 在顺风条件下指定控制或水平。该标准还描述了一种统一的 可重复的方法，用于记录室内占用空间中的LFN水平和光谱，其中 考虑因素很重要。户外的主要问题是风产生的风致噪声（WIN） 只有消息来源。本文根据文献给出了WIN与风速的最佳估计值 以及工作组针对本标准进行的特殊测试。本标准旨在定义 次声和LFN（ILFN）的常规观察或监测测量方法 现成的仪器、商用或特殊挡风玻璃，以及适当的麦克风 去完成手头的任务。遵循标准方法应促进统一性、可重复性和可比性 从一个站点到另一个站点的数据。

Part 7 of the ANSI/ASA S12.9 series describes cautions and unique techniques for measuring lowfrequency noise (LFN) outdoors in the presence of wind. It is necessary to measure in wind for wind turbine projects and for countless other industrial power and facilities where environmental wind speed cannot be controlled or levels are specified under downwind conditions. The standard also describes a uniform and repeatable methodology for documenting LFN levels and spectra indoors in occupied spaces where modal considerations are important. The principal concern outdoors is wind-induced noise (WIN) created by wind sources alone. The best estimates for WIN versus wind speed are presented herein based on the literature and special testing conducted by the working group for this standard. The standard is intended to define methods for routinely observed or monitored measurements of infrasound and LFN (ILFN) with standard off-the-shelf instrumentation, commercially available or special windscreens, and microphones appropriate to the task at hand. Following the standard methods should promote uniform, repeatable, and comparable data from site to site.