隆隆声的主要来源之一是建筑空气处理系统的管道系统。糟糕的风管系统设计往往取决于风管系统内部产生过多湍流。这种湍流会激发与管道相关的低频共振，并导致噪声辐射到相邻的占用空间。由于其灵活性，矩形管网比圆形管网更容易引发问题。一旦产生，16、31.5、63和J25 Hz倍频带中的声能不容易通过系统的“附加组件”衰减。通常，试图通过消声器、管道隔热层等固定装置来衰减这种噪声会使问题变得更糟，因为这些装置会衰减高频，而不会显著影响tpe低频能量。 其结果是一个更加不平衡的声音频谱，低频占主导地位，由此产生的噪音被认为是隆隆声。大多数问题的解决取决于在建筑管道系统的尺寸和规格方面使用良好的设计实践。Cerami、Shatalon和Bishop（1）、（2）提供了合理的设计指南，如果遵循这些指南，将有助于减少分离流和由此产生的管道隆隆声~Kingsbury和Sessler（3）也提出了其他建议做法。然而，由于安装空气处理器和相关管道系统的可用空间有限，因此不能始终遵循这些指南。通常情况下，设计师必须在较短的距离内妥协和扩张空气，并将肘部放在离风机切断点非常近的位置。 本文讨论了这些因素，并提出了风管设计和机械设备室设计的设计指南，以尽量减少和/或控制空气分配系统的噪声。引文:新墨西哥州阿尔伯克基市阿什雷学报第84卷第2部分

One of the primary sources of rumble originates in building air-handling systems ductwork. Poor duct system design often restts in the creation of excessively turbulent flow inside the ductwork. This turbulence excites low-frequency duct-related resonances, and results in noise radiation to adjoining occupied spaces. Because of its flexibility, rectangular ductwork is more apt to cause problems than is circular ductwork.Once generated, sound energy in the 16, 31.5, 63, and J25 Hz octave bands is not readily attenuated by "add-ons" to the system. Often, attempts to attenuate this noise with fixes such as mufflers, duct lagging, etc., make the problem worse since these devices attenuate the high frequencies without significantly affecting tpe low frequency energy. The result is an even more unbalanced sound spectra with the low frequencies dominating and the resulting noise heard as rumble.The resolution of most of these problems depends on the use of good design practice in sizing and specification of the building ductwork. Cerami, Shatalon and Bishop (1), (2) have provided reasonable design guidelines which, if followed, tend to minimize separated flow and the resulting duct rumble. ~dditional recommended practices are also suggested by Kingsbury and Sessler (3). However, these guidelines cannot always be followed due to limitations of available space in which to mount the air handler and associated ductwork. Often a designer must compromise and expand air in a shorter distance than recommended and place elbows very close to the fan cutoff. This paper discusses these factors and suggests design guidelines for duct design and the design of mechanical equipment rooms to minimize and/or contain noise from air distribution systems.