Smith Suzanne D
Air Force Research Laboratory, Wright-Patterson AFB, OH 45333-7901, USA.
Aviat Space Environ Med. 2002 Jan;73(1):36-45.
Exposure to high intensity, low frequency noise can cause whole-body vibration. Such exposures to airborne vibration can reach the limits of human tolerance and have been associated with physiological and pathological disorders. The objective of this study was to characterize human body vibration response during exposures to operational airborne vibration.
Triaxial body accelerations were collected at multiple anatomical sites with the subject located at selected crew positions during ground-based engine runup tests on several military tactical aircraft. The acceleration time histories were processed in one-third octave frequency bands and compared with the one-third octave band noise data.
The most significant finding was the occurrence of a resonance peak in the fore-and-aft (X) chest acceleration in the frequency bands between 63 and 100 Hz. Both the chest acceleration and associated noise level increased as the subject moved aft of the exhaust outlet, coinciding with the report of increasing chest vibration. A relatively linear relationship was found between the overall chest accelerations and noise levels between 5 and 250 Hz. An approach to developing combined noise and vibration exposure criteria was proposed.
The resonance observed in the upper torso strongly suggested that airborne vibration in the 60 to 100 Hz frequency band may be an important contributing factor in the generation of subjective symptoms and possibly physiological and pathological disorders. Additional field and laboratory studies are required to validate the relationship between the biodynamic responses, noise levels, and physiological and pathological consequences.
暴露于高强度、低频噪声会导致全身振动。这种空气传播振动的暴露可能达到人体耐受极限，并与生理和病理紊乱有关。本研究的目的是描述在暴露于运行中的空气传播振动期间人体的振动反应。
在几架军事战术飞机的地面发动机启动测试中，当受试者位于选定的机组人员位置时，在多个解剖部位收集三轴人体加速度。加速度时间历程在1/3倍频程频段进行处理，并与1/3倍频程频段噪声数据进行比较。
最显著的发现是在63至100Hz频段的前后（X）胸部加速度中出现了一个共振峰。随着受试者移至排气口后方，胸部加速度和相关噪声水平均增加，这与胸部振动增加的报告一致。在5至250Hz之间，整体胸部加速度与噪声水平之间发现了相对线性的关系。提出了一种制定联合噪声和振动暴露标准的方法。
在上躯干中观察到的共振强烈表明，60至100Hz频段的空气传播振动可能是产生主观症状以及可能的生理和病理紊乱的一个重要因素。需要进行更多的现场和实验室研究来验证生物动力学反应、噪声水平与生理和病理后果之间的关系。
