Postural implications of obtaining line–of–sight for seated operators of underground mining load-haul-dump vehicles

Abstract

Operators of load–haul–dump (LHD) vehicles use awkward postures that may be held statically and at extreme ranges of motion for long shift periods to spot hazards in underground mining. This study examined postural variables associated with three amounts of seat rotation intended to maximize line-of-sight during forward driving. Three different models, representing the 1st, 50th and 99th percentile male for height and weight, were positioned with appropriate hand and foot constraints in the virtual LHD cab modelled in Classic JACK v4.0. A total of 15 virtual movement strategies were developed to model the postural behaviour of typical workers and each virtual subject was tested, first with the seat in a neutral 0° position and then with it rotated counter-clockwise to 20° and 45°. Results revealed that reductions in trunk rotation, trunk lateral bend and neck rotation were associated with the seat rotation intervention. The general relationship observed was that as seat rotation increased, view of critical visual attention locations and visible line-of-sight area increased while postural load variables decreased. For the most part, 20° of seat rotation was beneficial but 45° produced significantly greater changes to postural load and visible visual attention locations.

Keywords:

• Seat rotation
• Computer-aided design
• Line-of-sight
• Awkward posture
• Jack

Acknowledgements

Funding for this research was provided by the Workplace Safety and Insurance Board, Grant #01–018. Ongoing support from the Mining and Aggregates Safety and Health Association (MASHA) is also appreciated.