School of Public Health, Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA.
Ergonomics. 2010 Nov;53(11):1385-94. doi: 10.1080/00140139.2010.519053.
Using a repeated measures design, this study compared differences in whole body vibration (WBV) exposures when 12 forklift operators drove the same forklift with a mechanical suspension and an air suspension seat. A portable PDA-based WBV data acquisition system collected and analysed time-weighted and raw WBV data per ISO 2631-1 and 2631-5 WBV measurement standards. Tri-axial measurements of weighted vibration (A(w)), crest factor, vibration dose values, time-weighted average-peak, raw (+) peak, raw (-) peak and static compression dose (S(ed)) were compared between seats. There were significant differences in z-axis WBV exposures with the air suspension seat, yielding lower WBV exposures. In addition, there were differences between seats in how they attenuated WBV exposures based on the driver's weight. In the mechanical suspension seat, WBV exposures were weight-dependent, with lighter drivers having higher WBV exposures, whereas with the air suspension seat, the same trends were not as prevalent. STATEMENT OF RELEVANCE: This study contributes to the understanding of how different seat suspensions can influence WBV transmission and how some components of vibration transmission are dependent on the weight of the driver. Additional systematic studies are needed to quantify how various factors can influence WBV exposures.
采用重复测量设计，本研究比较了 12 名叉车操作员在驾驶配备机械悬架和空气悬架座椅的同一辆叉车时全身振动（WBV）暴露的差异。便携式基于 PDA 的 WBV 数据采集系统根据 ISO 2631-1 和 2631-5 WBV 测量标准收集和分析了时间加权和原始 WBV 数据。对座椅之间加权振动（A(w)）、峰因子、振动剂量值、时间加权平均-峰值、原始（+）峰值、原始（-）峰值和静态压缩剂量（S(ed)）进行了三轴测量。空气悬架座椅的 z 轴 WBV 暴露存在显著差异，产生较低的 WBV 暴露。此外，座椅在根据驾驶员体重衰减 WBV 暴露方面存在差异。在机械悬架座椅中，WBV 暴露与体重有关，体重较轻的驾驶员的 WBV 暴露较高，而在空气悬架座椅中，相同的趋势并不明显。相关性陈述：本研究有助于了解不同座椅悬架如何影响 WBV 传递，以及振动传递的某些部分如何取决于驾驶员的体重。需要进行更多的系统研究来量化各种因素如何影响 WBV 暴露。
