Dong Ren G, Welcome Daniel E, McDowell Thomas W, Wu John Z, Schopper Aaron W
Engineering and Control Technology Branch, HELD, National Institute for Occupational Safety and Health, CDC, MS L-2027, 1095 Willowdale Road, Morgantown, WV 26505, USA.
J Biomech. 2006;39(12):2311-24. doi: 10.1016/j.jbiomech.2005.07.028. Epub 2005 Sep 12.
The objectives of this study are to derive the frequency weighting from three vibration power absorption (VPA) methods (finger VPA, palm VPA, and total or hand VPA), and to explore whether these energy methods are better than the currently accepted acceleration method. To calculate the VPA weightings, the mechanical impedance of eight subjects exposed to a broadband random vibration spectrum in the z(h)-axis using 18 combinations of hand couplings and applied forces was measured. The VPA weightings were compared with the frequency weighting specified in ISO 5349-1 [2001. Mechanical Vibration--Measurement and Evaluation of Human Exposure to Hand--Transmitted Vibration--Part 1: General Requirements. International Organization for Standardization, Geneva, Switzerland]. This study found that the hand and palm VPA weightings are very similar to the ISO weighting but the finger VPA weighting for the combined grip and push action is much higher than the ISO weighting at frequencies higher than 25 Hz. Therefore, this study predicted that the total power absorption of the entire hand-arm system is likely to be correlated with psychophysical response or subjective sensation. However, if the ISO weighting method cannot yield good predictions of the vibration-induced disorders in the fingers and hand, the hand and palm energy methods are unlikely to yield significantly better predictions. The finger VPA is a vibration measure between unweighted and ISO weighted accelerations. The palm VPA method may have some value for studying the disorders in the wrist-arm system.
本研究的目的是从三种振动功率吸收（VPA）方法（手指VPA、手掌VPA和全手或手部VPA）得出频率加权，并探讨这些能量方法是否优于目前公认的加速度方法。为了计算VPA加权，测量了8名受试者在z（h）轴上暴露于宽带随机振动谱时，使用18种手部耦合和作用力组合的机械阻抗。将VPA加权与ISO 5349-1 [2001. 机械振动——人体对手部传递振动暴露的测量与评价——第1部分：一般要求。国际标准化组织，瑞士日内瓦] 中规定的频率加权进行比较。本研究发现，手部和手掌VPA加权与ISO加权非常相似，但在高于25Hz的频率下，组合握持和推压动作的手指VPA加权远高于ISO加权。因此，本研究预测，整个手臂系统的总功率吸收可能与心理物理反应或主观感觉相关。然而，如果ISO加权方法不能很好地预测手指和手部的振动诱发疾病，那么手部和手掌能量方法也不太可能产生明显更好的预测。手指VPA是一种介于未加权和ISO加权加速度之间的振动测量方法。手掌VPA方法可能对研究手腕-手臂系统的疾病有一定价值。
