Design and Development of a Test Rig for Ergonomic Evaluation of Pistol grip Power Tools

手枪式电动工具工效评价试验台的设计与开发

• 批准号: 535905-2018
• 负责人: Chandrashekar, Naveen
• 金额: $ 1.57万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=678555
• 关键词: Design; Development; Test; Rig; Ergonomic

DC Hand tools are commonly used in manufacturing industries for tightening of fasteners. These hand tools will result in reaction torque on the hand due torque buildup. This results in forceful exertion of the hand operating the hand tools. Repeated stretching of tendons of the wrist during such repetitive tasks results in some of its fibers being torn. This results in inflammation of the tendon leading to tendinitis. Chronic tendon disorders, such as tendinitis, are major causes of lost work and workers' compensation in manufacturing industries. However, the correlation between operational parameters such as operator position, gripping force, tightening algorithm and torque applied to the reaction torque produced is unknown. We propose a combined modelling and experimental approach to study the factors that affect the reaction torque with the aim of minimizing the handle displacement when pistol grip hand tools are used to tighten fasteners in various operating positions. A first order linear model that consists of spring and dashpot will be used to represent the human hand. Twenty experienced hand tool operators will be conducting fastening tasks, in various positions, using instrumented pistol-grip hand tool on a specially made frame. The model parameters such as spring stiffness and damping coefficients will be determined through experiments A custom test rig will be designed and built to simulate the hand-tool interaction. The test rig would have capability to simulate various spring and damping coefficients that are experimentally found. The rig will be used to study the effect of various operational parameters and non-operational parameters such as gender on handle displacement due to reaction torque. The combination of parameters that would minimize the handle displacement in each operational position will then be determined. Using the results of the research, one can determine the parameters that would result in minimal handle displacement for each operational position. This will help the industrial partner to design the task and workplace so that repetitive strain injuries are reduced and safe working habits are followed.

DC手动工具通常用于制造业，用于拧紧紧固件。这些手动工具将导致扭矩堆积的手动扭矩。这会导致手动手动工具的手施加强大的努力。在这种重复的任务中，腕部的肌腱的重复拉伸导致其某些纤维被撕裂。这导致肌腱发炎导致肌腱炎。慢性肌腱疾病（例如肌腱炎）是损失工作的主要原因和在制造业中的工人赔偿。然而，尚不清楚操作参数（例如操作参数，抓地力，拧紧算法和扭矩）之间的相关性是未知的。我们提出了一种组合的建模和实验方法，以研究影响反应扭矩的因素，目的是将手枪握把手动工具最小化，以最大程度地限制手柄移动工具来拧紧在各种工作位置的紧固件。由弹簧和仪表板组成的一阶线性模型将用于表示人的手。二十个经验丰富的手动工具操作员将使用仪器手枪手动工具在专门制作的框架上使用仪器手枪手动工具进行固定任务。诸如弹簧刚度和阻尼系数之类的模型参数将通过实验确定定制测试钻机将设计和构建，以模拟手工工具的相互作用。测试钻机将有能力模拟实验发现的各种弹簧和阻尼系数。该钻机将用于研究各种操作参数和非手术参数（例如由于反应扭矩）在手柄位移上的影响。然后将确定将最小化每个操作位置中的手柄位移的参数的组合。 使用研究的结果，可以确定每个操作位置最小的手柄位移的参数。这将有助于工业合作伙伴设计任务和工作场所，以减少重复的应变伤害，并遵循安全的工作习惯。