Predicting subjective perceptions of powered tool torque reactions

Lin, Jia‐Hua; McGorry, Raymond W.

doi:10.1016/j.apergo.2008.01.020

Cited by 22 publications

(9 citation statements)

References 30 publications

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“…Subjective comfort and discomfort in the case of products subject to manual manipulation are usually assessed using questionnaires using rating scales to assess the characteristics examined (Boyles et al, 2003; Chandra and Chandna, 2011; Lee and Chen, 2008;Carse et al, 2007). Also are used pain maps, measurement of pain and discomfort assessment (Kihlberg et al, 1995;Trejo et al, 2006;Lin and McGorry, 2009). Subjective evaluations have some disadvantage: they require a large number of participants and therefore require a lot of time (Lee et al, 1993), and they are influenced by personal preferences (Chen et al, 1994).…”

Section: Subjective Methodsmentioning

confidence: 99%

Research methodologies for assessing the ergonomics of packaging products - A review

Bošnjaković¹,

Design²,

Vladić³

2020

Proceedings - The Tenth International Symposium GRID 2020

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In today’s increasingly competitive market environment, new packaging must meet more requirements than before to meet customer expectations. The packaging must meet not only functional and aesthetic requirements but also ergonomic requirements to ensure satisfying user experience. An important issue in ergonomic design is the identification of factors that lead to user comfort and discomfort. The packaging is a product that undergoes manual manipulation and given the various forms of packaging and it's opening and closing systems, they require using different grip types and movements. Using packaging that is not well designed can cause intense physical exertion and frustration for users. The subject of this paper is a review of methodologies for assessing the ergonomics of packaging products. Methodologies for evaluating the ergonomic characteristics of packaging provide a proposal for structuring the investigation. Also, it gives a proposal for the proper prioritization of a packaging problem that should be identified as the most dangerous risks for physical injuries or for causing stressful situations to users. First, it is necessary to gain a clear insight into how the users handle the packaging in order to create knowledge and a clear idea of what is useful or harmful in the existing packaging design and to find the potential for its improvement. There are various methods for studying, analyzing and evaluating user experience while using a packaging. Combining such methods with knowledge of the anatomical structure of the body and how it reacts to the load enables the creation of efficient and ergonomically designed packaging. This paper will present methodologies and guidelines for assessing and improving the ergonomic qualities of packaging. The aim of this paper is to define the key factors and most relevant methodologies for conducting successful ergonomic research.

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Section: Subjective Methodsmentioning

confidence: 99%

Research methodologies for assessing the ergonomics of packaging products - A review

Bošnjaković¹,

Design²,

Vladić³

2020

Proceedings - The Tenth International Symposium GRID 2020

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show abstract

“…Several physical parameters have been investigated to find the relationship between gripping comfort and physical parameters such as electromyography (EMG) signals, contact pressure (Kuijt-Evers et al 2007) and force (Lin and McGorry, 2009;. Moreover, the relationships between gripping comfort and factors that relates to human subject's characteristics such as age, gender and hand dimensions have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

The factors that affect gripping comfort score, palmar contact pressure and fingers posture during gripping columnar objects

Hokari

Ikarashi

Pramudita

et al. 2021

Mechanical Engineering Journal

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In present study, human subject experiment including sensory evaluation was conducted to investigate gripping comfort during gripping spherical and columnar objects and to identify important factors that affect gripping comfort score. Contact pressure measurement using a pressure sensor sheet and fingers posture measurement using a motion capture system during each gripping task were then carried out to investigate the individual differences in gripping style and to reveal the differences in fingers posture according to the shapes of the test objects. As a result, significant differences in the gripping comfort score between male and female could not be found in all test objects. Additionally, the coefficients of determination of the relationship between the gripping comfort score and hand length and between the gripping comfort score and hand breadth were considered low in all test objects. Furthermore, a hierarchical cluster analysis of contact pressure distribution demonstrated that two gripping styles during gripping a cylinder existed in present study. Joint angles around x-axes of PIP joints of the middle finger and the ring fingers, around y-axis of CM joint of the thumb and around y-axes of MCP joints of the five fingers varied according to the gripping styles. Moreover, significant differences in 11 joint angles among test objects were confirmed based on the analysis result of fingers posture. This result indicates that fingers posture during gripping changes with the change of the shape of the test object. The results of present study provide information regarding important factors that should be considered or may not be considered during the evaluation and improvement of the gripping comfort of a manufactured product.

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“…tendinosis, myofascial pain) (Ku et al , 2007; Radwin et al , 1989; Sesto et al , 2005). These dynamic forces cause eccentric exertions in upper extremity muscles (Kihlberg et al , 1995, 1994; Lin and McGorry, 2009; Lin et al , 2003a, 2003b; Radwin et al , 1989). Laboratory-based studies have shown that torque tool operators give unfavorable subjective ratings to torque tools that produce large handle displacements (Kihlberg et al , 1994).…”

Section: Introductionmentioning

confidence: 99%

A dynamic simulator for the ergonomics evaluation of powered torque tools for human assembly

Luscher

Sommerich

2017

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Purpose The purpose of this study is to design and develop a testing device to simulate interaction between human hand–arm dynamics, right-angle (RA) computer-controlled power torque tools and joint-tightening task-related variables. Design/methodology/approach The testing rig can simulate a variety of tools, tasks and operator conditions. The device includes custom data-acquisition electronics and graphical user interface-based software. The simulation of the human hand–arm dynamics is based on the rig’s four-bar mechanism-based design and mechanical components that provide adjustable stiffness (via pneumatic cylinder) and mass (via plates) and non-adjustable damping. The stiffness and mass values used are based on an experimentally validated hand–arm model that includes a database of model parameters. This database is with respect to gender and working posture, corresponding to experienced tool operators from a prior study. Findings The rig measures tool handle force and displacement responses simultaneously. Peak force and displacement coefficients of determination (R2) between rig estimations and human testing measurements were 0.98 and 0.85, respectively, for the same set of tools, tasks and operator conditions. The rig also provides predicted tool operator acceptability ratings, using a data set from a prior study of discomfort in experienced operators during torque tool use. Research limitations/implications Deviations from linearity may influence handle force and displacement measurements. Stiction (Coulomb friction) in the overall rig, as well as in the air cylinder piston, is neglected. The rig’s mechanical damping is not adjustable, despite the fact that human hand–arm damping varies with respect to gender and working posture. Deviations from these assumptions may affect the correlation of the handle force and displacement measurements with those of human testing for the same tool, task and operator conditions. Practical implications This test rig will allow the rapid assessment of the ergonomic performance of DC torque tools, saving considerable time in lineside applications and reducing the risk of worker injury. DC torque tools are an extremely effective way of increasing production rate and improving torque accuracy. Being a complex dynamic system, however, the performance of DC torque tools varies in each application. Changes in worker mass, damping and stiffness, as well as joint stiffness and tool program, make each application unique. This test rig models all of these factors and allows quick assessment. Social implications The use of this tool test rig will help to identify and understand risk factors that contribute to musculoskeletal disorders (MSDs) associated with the use of torque tools. Tool operators are subjected to large impulsive handle reaction forces, as joint torque builds up while tightening a fastener. Repeated exposure to such forces is associated with muscle soreness, fatigue and physical stress which are also risk factors for upper extremity injuries (MSDs; e.g. tendinosis, myofascial pain). Eccentric exercise exertions are known to cause damage to muscle tissue in untrained individuals and affect subsequent performance. Originality/value The rig provides a novel means for quantitative, repeatable dynamic evaluation of RA powered torque tools and objective selection of tightening programs. Compared to current static tool assessment methods, dynamic testing provides a more realistic tool assessment relative to the tool operator’s experience. This may lead to improvements in tool or controller design and reduction in associated musculoskeletal discomfort in operators.

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Predicting subjective perceptions of powered tool torque reactions

Cited by 22 publications

References 30 publications

Research methodologies for assessing the ergonomics of packaging products - A review

Research methodologies for assessing the ergonomics of packaging products - A review

The factors that affect gripping comfort score, palmar contact pressure and fingers posture during gripping columnar objects

A dynamic simulator for the ergonomics evaluation of powered torque tools for human assembly

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