Welcome Daniel E, Dong Ren G, Xu Xueyan S, Warren Christopher, McDowell Thomas W
Engineering & Control Technology Branch, National Institute for Occupational Safety and Health, Morgantown, WV, USA.
Occup Ergon. 2016;13(1):23-44. doi: 10.3233/OER-160235.
Fingers-transmitted vibration can cause vibration-induced white finger. The effectiveness of vibration-reducing (VR) gloves for reducing hand transmitted vibration to the fingers has not been sufficiently examined.
The objective of this study is to examine tool-specific performance of VR gloves for reducing finger-transmitted vibrations in three orthogonal directions (3D) from powered hand tools.
A transfer function method was used to estimate the tool-specific effectiveness of four typical VR gloves. The transfer functions of the VR glove fingers in three directions were either measured in this study or during a previous study using a 3D laser vibrometer. More than seventy vibration spectra of various tools or machines were used in the estimations.
When assessed based on frequency-weighted acceleration, the gloves provided little vibration reduction. In some cases, the gloves amplified the vibration by more than 10%, especially the neoprene glove. However, the neoprene glove did the best when the assessment was based on unweighted acceleration. The neoprene glove was able to reduce the vibration by 10% or more of the unweighted vibration for 27 out of the 79 tools. If the dominant vibration of a tool handle or workpiece was in the shear direction relative to the fingers, as observed in the operation of needle scalers, hammer chisels, and bucking bars, the gloves did not reduce the vibration but increased it.
This study confirmed that the effectiveness for reducing vibration varied with the gloves and the vibration reduction of each glove depended on tool, vibration direction to the fingers, and finger location. VR gloves, including certified anti-vibration gloves do not provide much vibration reduction when judged based on frequency-weighted acceleration. However, some of the VR gloves can provide more than 10% reduction of the unweighted vibration for some tools or workpieces. Tools and gloves can be matched for better effectiveness for protecting the fingers.
手指传递的振动可导致振动性白指。减震（VR）手套减少手部向手指传递振动的效果尚未得到充分研究。
本研究的目的是检验VR手套在减少电动手动工具在三个正交方向（3D）上向手指传递振动方面的工具特定性能。
采用传递函数法评估四种典型VR手套的工具特定有效性。本研究或之前一项研究中使用三维激光振动计测量了VR手套手指在三个方向上的传递函数。评估中使用了七十多种各种工具或机器的振动光谱。
基于频率加权加速度评估时，手套几乎没有起到减震作用。在某些情况下，手套会使振动放大超过10%，尤其是氯丁橡胶手套。然而，基于未加权加速度评估时，氯丁橡胶手套表现最佳。在79种工具中的27种工具上，氯丁橡胶手套能够将未加权振动减少10%或更多。如果工具手柄或工件的主导振动相对于手指处于剪切方向，如在针状除锈器、锤凿和打桩杆的操作中观察到的那样，手套不会减少振动，反而会增加振动。
本研究证实，减震效果因手套而异，每种手套的减震效果取决于工具、手指的振动方向和手指位置。基于频率加权加速度判断时，VR手套，包括经认证的防振手套，减震效果不佳。然而，一些VR手套对某些工具或工件可使未加权振动减少超过10%。工具和手套可以进行匹配，以提高保护手指的效果。
