Biodynamic responses of lightweight, mediumweight and heavyweight subjects in seating posture exposed to single-axis vertical vibration

IF 2.5 2区 工程技术 Q2 ENGINEERING, INDUSTRIAL
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Abstract

Lack of the biodynamic data of lightweight and heavyweight human bodies in seating posture becomes an impediment to developing dynamic dummies and relevant standards for improving vehicle ride comfort and reducing health risks caused by vibration. To acquire missing data and gain an understanding of relevant biodynamic responses, the vertical apparent masses of seated subjects in lightweight and heavyweight groups as well as the mediumweight group (targeted mass 55 kg, 98–115 kg, and 75 kg) were experimentally measured and studied under 9 vibration magnitudes (0.25, 0.315, 0.4, 0.5, 0.63, 0.8, 1.0, 1.25 and 1.6 ms−2 r.m.s. with a common ratio of ca. 1.25) without and with the support of an upright backrest. Each group had twelve subjects. With an increase in the vibration magnitude from 0.25 to 1.6 ms−2 r.m.s., the resonance frequency of the vertical apparent mass showed a decreasing trend. This was observed with all three bodyweight groups and two backrest conditions. Results of pairwise Wilcoxon signed-rank tests showed that, when the vibration magnitude increased by a factor of ca. 1.25, its effect on the resonance frequency was statistically insignificant in most cases. The results provided data on the vertical apparent mass for the heavyweight subjects that have not been reported and augmented the database of those for the lightweight subjects.

轻量级、中等重量级和重量级受试者在单轴垂直振动下的坐姿生物动力学反应
缺乏轻量级和重量级人体在坐姿下的生物动力学数据,阻碍了动态假人和相关标准的制定,从而无法改善车辆的乘坐舒适性,降低振动对健康造成的危害。为了获得缺失的数据并了解相关的生物动力学响应,我们对轻量级组、重量级组和中量级组(目标质量分别为 55 千克、98-115 千克和 75 千克)的坐姿受试者的垂直视质量进行了实验测量,并在 9 种振动量级(0.25、0.315、0.4、0.5、0.63、0.8、1.0、1.25 和 1.6 ms-2 r.m.s.,普通比率约为 1.25)下进行了测量和研究。每组有 12 名受试者。随着振动幅度从 0.25 到 1.6 ms-2 r.m.s.的增加,垂直视质量的共振频率呈下降趋势。这在所有三个体重组和两种靠背条件下都能观察到。Wilcoxon 符号秩检验的结果表明,当振动幅度增加约 1.25 倍时,其对共振频率的影响在大多数情况下并不明显。这些结果提供了有关重量级受试者垂直视质量的数据,而这些数据尚未见诸报道,同时还扩充了轻量级受试者的数据库。
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来源期刊
International Journal of Industrial Ergonomics
International Journal of Industrial Ergonomics 工程技术-工程:工业
CiteScore
6.40
自引率
12.90%
发文量
110
审稿时长
56 days
期刊介绍: The journal publishes original contributions that add to our understanding of the role of humans in today systems and the interactions thereof with various system components. The journal typically covers the following areas: industrial and occupational ergonomics, design of systems, tools and equipment, human performance measurement and modeling, human productivity, humans in technologically complex systems, and safety. The focus of the articles includes basic theoretical advances, applications, case studies, new methodologies and procedures; and empirical studies.
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