Forthcoming and Online First Articles

International Journal of the Digital Human

International Journal of the Digital Human (IJDH)

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International Journal of the Digital Human (2 papers in press)

Regular Issues

  •   Free full-text access Open AccessVerification of manikin motions in human-industrial robot collaborative simulations
    ( Free Full-text Access ) CC-BY-NC-ND
    by Fredrik Ore, Pamela Ruiz Castro, Lars Hanson, Magnus Wiktorsson, Stefan Gustafsson 
    Abstract: A recently developed simulation software, IPS-HIRC, combines digital humans and industrial robots into one environment in order to design human-industrial robot collaborative (HIRC) workstations. The aim of this study is to verify the manikin motions predicted by the mathematical algorithm in the software with results obtained from motions performed by humans in experiments. These motions are measured through motion capture data on humans performing a HIRC work task in laboratory workstations. These stations represent HIRC workstations considered in an international heavy vehicle manufacturing company. The results showcase significant correlations in the motions in one of the two use cases, but fewer correlations when comparing the total operation time. The main reason for this is the complexity of the two cases and the lack of professional assembly experience among the test participants. Thus new verification studies are needed in use cases that more properly represent human motions in a manufacturing workstation.
    Keywords: human-robot collaboration; HRC; simulation; verification; validation; digital human modelling; DHM; industrial robot; motion capture; workstation.
    DOI: 10.1504/IJDH.2022.10049475
  • Digital human model simulation of the movement variability induced by muscle fatigue during a repetitive pointing task until exhaustion   Order a copy of this article
    by Jonathan Savin, Clarisse Gaudez, Martine A. Gilles, Vincent Padois, Philippe Bidaud 
    Abstract: Movement variability is a fundamental feature of human movement. It occurs in all kinds of activity including workplace tasks. Despite its prevalence, workstation designers are hardly aware of it. Neglecting this variability may lead designers to ignore parts of the future operator’s activity, thus leading to an incomplete assessment of their occupational risks. This article describes a model-based virtual human and its controller, intended to simulate the movement variability induced by muscle fatigue during a repetitive activity until exhaustion. It associates a multi-body dynamics framework and a three-compartment muscle fatigue model. When simulating a repetitive pointing task, our DHM reproduces some aspects of human movement variability. Improvements are still needed to account for intra- and inter-individual movement variability patterns recently highlighted in the literature. Yet, this approach raises interesting perspectives regarding new DHM features providing workstation designers with more comprehensive ergonomic assessments from the early stages of workstation design.
    Keywords: movement variability; muscle fatigue; digital human model; DHM; simulation; repetitive pointing activity; ergonomics assessment; workstation design.
    DOI: 10.1504/IJDH.2022.10051921