Xu Xueyan S, Welcome Daniel E, Warren Christopher M, McDowell Thomas W, Dong Ren G
Physical Effects Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA.
Measurement (Lond). 2019 Apr;137:362-374. doi: 10.1016/j.measurement.2019.01.034.
The objective of this study was to develop a convenient and reliable adapter method for testing and evaluating vibration-reducing (VR) gloves and VR materials at the fingers. The general requirements and technical specifications for the design of the new adapter were based on our previous studies of hand-held adapters for vibration measurement and a conceptual model of the fingers-adapter-glove-handle system developed in this study. Two thicknesses (2 mm and 3 mm) of the adapter beam were fabricated using a 3-D printer. Each adapter is a thin beam equipped with a miniature tri-axial accelerometer (1.1 g) mounted at its center, with a total weight ≤ 2.2 g. To measure glove vibration transmissibility, the adapter is held with two gloved fingers; a finger is positioned on each side of the accelerometer. Each end of the adapter beam is slotted between the glove material and the finger. A series of experiments was conducted to evaluate this two-fingers-held adapter method by measuring the transmissibility of typical VR gloves and a sample VR material. The experimental results indicate that the major resonant frequency of the lightweight adapter on the VR material (≥800 Hz) is much higher than the resonant frequencies of the gloved fingers grasping a cylindrical handle (≤300 Hz). The experimental results were repeatable across the test treatments. The basic characteristics of the measured glove vibration transmissibility are consistent with the theoretical predictions based on the biodynamics of the gloved fingers-hand-arm system. The results suggest that VR glove fingers can effectively reduce only high-frequency vibration, and VR effectiveness can be increased by reducing the finger contact force. This study also demonstrated that the finger adapter method can be combined with the palm adapter method prescribed in the standardized glove test, which can double the test efficiency without substantially increasing the expense of the test.
本研究的目的是开发一种方便可靠的适配方法，用于测试和评估手指部位的减振（VR）手套及VR材料。新适配装置设计的总体要求和技术规格基于我们之前对手持式振动测量适配装置的研究，以及本研究中开发的手指-适配装置-手套-手柄系统的概念模型。适配梁采用3D打印机制作了两种厚度（2毫米和3毫米）。每个适配装置是一根细梁，其中心安装有一个微型三轴加速度计（1.1克），总重量≤2.2克。为测量手套的振动传递率，用戴手套的两根手指握住适配装置；加速度计两侧各放置一根手指。适配梁的两端插在手套材料和手指之间。通过测量典型VR手套和一种VR材料样本的传递率，进行了一系列实验来评估这种双指握持适配方法。实验结果表明，轻质适配装置在VR材料上的主要共振频率（≥800赫兹）远高于戴手套的手指握住圆柱形手柄时的共振频率（≤300赫兹）。实验结果在各测试处理中具有可重复性。所测量的手套振动传递率的基本特征与基于戴手套的手指-手-手臂系统生物动力学的理论预测一致。结果表明，VR手套的手指只能有效降低高频振动，并且通过降低手指接触力可以提高VR效果。本研究还表明，手指适配方法可与标准化手套测试中规定的手掌适配方法相结合，这可以在不大幅增加测试成本的情况下使测试效率提高一倍。
