The relationships of gripping comfort to contact pressure and hand posture during gripping

Hokari, Kazuki; Pramudita, Jonas A.; Ito, Masato; Noda, Satoshi; Tanabe, Yuji

doi:10.1016/j.ergon.2019.01.010

Cited by 19 publications

(33 citation statements)

References 35 publications

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“…Leather garments rely on outdated second-hand machines because they are cheap rather, than buying the latest machines which are expensive. Attention must be given to anthropometric data as these have a huge impact on leather garment production, where monotonous and repetitive activity is prevalent [47][48][49].…”

Section: Ergonomics In Leather Garmentsmentioning

confidence: 99%

Role of Ergonomic Factors Affecting Production of Leather Garment-Based SMEs of India: Implications for Social Sustainability

et al. 2020

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This paper aims to identify, evaluate, and measure the ergonomic factors hampering the production of leather garment-based small and medium-sized enterprises (SMEs). Ergonomic problems faced by the workers largely impact the health of individuals and also the productivity of a firm. Based on experts’ opinions and a literature survey, three emerging categories—namely, occupational disease, personal factors, and the industrial environment—with a total of twenty factors were identified to examine symmetrical impact in five leather garment companies. In this research work, Cronbach’s α was evaluated to check the validity of the ergonomic factors identified through the literature survey. Then, using the fuzzy analytic hierarchy process (FAHP), the identified ergonomic factors were evaluated. A sensitivity analysis was carried out to validate the robustness of the results obtained using the integrated approach. Outdated machinery, vibration, operational setup, fatigue, and poor ventilation and lighting are the top five factors inducing ergonomic-related problems and hampering the production of the leather garment companies in India. These top ergonomic factors are the result of a failure in the provision of an ambient working environment. Providing ergonomically designed working environments may lower the occurrence of ergonomic problems. The findings of this study will assist industrial managers to enhance production rate and to progress towards social sustainability in Indian SMEs. The proposed symmetrical assessment in this study could also be considered as a benchmark for other companies in which human–machine interaction is significant.

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Section: Ergonomics In Leather Garmentsmentioning

confidence: 99%

Role of Ergonomic Factors Affecting Production of Leather Garment-Based SMEs of India: Implications for Social Sustainability

et al. 2020

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“…Nine Japanese females (age: 21.2 ± 1.0 years) who had never suffered from any hand or finger dysfunctions were recruited for the test. The number of subjects was the same with the number of subjects in our previous study using male subjects (Hokari et al, 2019). The result of the previous study was incorporated into present study in order to investigate the differences in gender.…”

Section: Human Subjectsmentioning

confidence: 99%

“…We also investigated the relationships between gripping comfort and palmar contact pressure distribution as well as finger joint angles. We then figured out the effect of gripped object's shape on the gripping comfort (Hokari et al, 2019). Although the relationships among physical parameters, characteristics of gripped object and human subject's characteristics have been thoroughly investigated in many ways, those studies usually focused on one single shape and sometimes neglected physical parameters as a quantitative measure for gripping comfort.…”

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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“…In the literature [17], comfort or discomfort was quantified as the maximum tolerable force loaded on the shoulder, thigh and shank, and it was reported to vary among participants. Regression statistics were applied in studies [18] and [19] to extract the correlation between comfort and contact force of gripping. In addition, an artificial neural network (ANN) was built in [20] to predict comfort level of automobile seat with contact pressure as one of the input variables.…”

Section: Introductionmentioning

confidence: 99%

A Soft Pressure Sensor Skin to Predict Contact Pressure Limit Under Hand Orthosis

Tan

Ahmed‐Kristensen

Cao

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

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Customized static orthoses in rehabilitation clinics often cause side effects, such as discomfort and skin damage due to excessive local contact pressure. Currently, clinicians adjust orthoses to reduce high contact pressure based on subjective feedback from patients. However, the adjustment is inefficient and prone to variability due to the unknown contact pressure distribution as well as differences in discomfort due to pressure across patients. This paper proposed a new method to predict a threshold of contact pressure (pressure limit) associated with moderate discomfort at each critical spot under hand orthoses. A new pressure sensor skin with 13 sensing units was configured from FEA results of pressure distribution simulated with hand geometry data of six healthy participants. It was used to measure contact pressure under two types of customized orthoses for 40 patients with bone fractures. Their subjective perception of discomfort was also measured using a 6 scores discomfort scale. Based on these data, five critical spots were identified that correspond to high discomfort scores (> 1) or high pressure magnitudes (> 0.024 MPa). An artificial neural network was trained to predict contact pressure at each critical spot with orthosis type, gender, height, weight, discomfort scores and pressure measurements as input variables. The neural networks show satisfactory prediction accuracy with R 2 values over 0.81 of regression between network outputs and measurements. This new method predicts a set of pressure limits at critical locations under the orthosis that the clinicians can use to make orthosis adjustment decisions.

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The relationships of gripping comfort to contact pressure and hand posture during gripping

Cited by 19 publications

References 35 publications

Role of Ergonomic Factors Affecting Production of Leather Garment-Based SMEs of India: Implications for Social Sustainability

Role of Ergonomic Factors Affecting Production of Leather Garment-Based SMEs of India: Implications for Social Sustainability

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

A Soft Pressure Sensor Skin to Predict Contact Pressure Limit Under Hand Orthosis

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