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Numerical models and computer-aided modeling software are tools commonly usedto assess the accessibility of an environment, based on static human bodydimensions. In this paper, the limits of validity of these approaches areassessed by comparing the reach envelopes obtained by these methods to thoseobtained experimentally. First, the accessibility areas of forty adultsubjects, which may correspond to the distance of reachability of products,were evaluated by performing an accessibility task comprising 168 reach points.Second, anthropometric characteristics of participants were recorded and usedto perform the reach assessment by a numerical method, and then by a CAD-basedanalysis, where the reach was predicted using the software's maximumreach-envelope generation. In spite of the simple nature of the presenteddesign problem (two-dimensional), the results show important differencesbetween the three methods. The study of the number of reached points shows thatthe CAD-based assessment provides more accurate results than the numericalmodel. Nevertheless, the shapes envelopes comparison indicates that the maximumreach envelopes obtained with the CAD analysis are not always consistent withthose obtained experimentally, closely linked to the hand location. Resultsindicate that the CAD model used to obtain maximum reaches gave predictionsthat underestimate the reach ability.

Assessing the differences between numerical methods, CAD evaluations and real experiments for the assessement of reach envelopes of the human body