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Scalability of human models

Author: Rodarius, C. · Rooij, L. van · Lange, R. de
Type:article
Date:2007
Institution: TNO Industrie en Techniek
Source:20th International Technical Conference on the Enhanced Safety of Vehicles (ESV), 18-21 June, 2007, Lyon, France
Identifier: 462135
Article number: 07-0314
Keywords: Ergonomics · Industrial Innovation

Abstract

The objective of this work was to create a scalable human occupant model that allows adaptation of human models with respect to size, weight and several mechanical parameters. Therefore, for the first time two scalable facet human models were developed in MADYMO. First, a scalable human male was created from an existing 50th percentile human occupant. But since the anthropometry between males and females differs too severely, a scalable human female was created as well to be able to obtain female models with different anthropometry. Using these models in the MADYMO / Scaler, a target model anthropometry could be created either by defining an anthropometry set of 35 values, by defining 16 fixed scale factors or by using the GEBOD anthropometry database (BAUGHMAN, 1986). Additional to the geometric properties, the following mechanical properties were also scaled using appropriate scaling rules: mass, inertia, stiffness and contact characteristics. Several anthropometrically extreme models, ranging from small children to large adults, have been created using the 3 possible methods to provide the input. Direct definition of anthropometry values and definition of fixed scaling factors resulted in realistic scaled models, whereas using the GEBOD anthropometry database could lead to unrealistic ones, especially when scaling towards children. A frontal crash application has been developed, using the original 50th percentile human occupant as released with MADYMO and two scaled male models of 65 kg and 85 kg weight with equal height as the base model, to demonstrate the benefit of the scalable models.