Evaluation of physical workload affected by mass and center of mass of head-mounted display

Takanori Chihara; Akihiko Seo

doi:10.1016/j.apergo.2017.11.016

Evaluation of physical workload affected by mass and center of mass of head-mounted display

Appl Ergon. 2018 Apr:68:204-212. doi: 10.1016/j.apergo.2017.11.016. Epub 2017 Dec 6.

Authors

Takanori Chihara¹, Akihiko Seo²

Affiliations

¹ Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan. Electronic address: chihara@staff.kanazawa-u.ac.jp.
² Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan. Electronic address: aseo@tmu.ac.jp.

PMID: 29409636
DOI: 10.1016/j.apergo.2017.11.016

Abstract

A head-mounted display (HMD) with inappropriate mass and center of mass (COM) increases the physical workload of HMD users. The aim of this study was to investigate the effects of mass and COM of HMD on physical workload. Twelve subjects participated in this study. The mass and posteroanterior COM position were 0.8, 1.2, or 1.6 kg and -7.0, 0.0, or 7.0 cm, respectively. The subjects gazed at the target objects in four test postures: the neutral, look-up, body-bending, and look-down postures. The normalized joint torques for the neck and the lumbar region were calculated based on the measured segment angles. The results showed that the neck joint torque was significantly affected by mass and COM and it increased as the HMD mass increased for all test postures. The COM position that minimized the neck joint torque varied depending on the test postures, and the recommended ranges of COM were identified.

Keywords: Biomechanical analysis; Head-mounted display; Physical workload.

Publication types

Evaluation Study

MeSH terms

Data Display*
Equipment Design
Female
Head / physiology*
Head Movements / physiology*
Humans
Male
Neck
Posture
Wearable Electronic Devices*
Weight-Bearing
Workload*
Young Adult