Statistical Modeling of Automotive Seat Shapes
Published April 5, 2016 by SAE International in United States
Annotation of this paper is available
Automotive seats are commonly described by one-dimensional measurements, including those documented in SAE J2732. However, 1-D measurements provide minimal information on seat shape. The goal of this work was to develop a statistical framework to analyze and model the surface shapes of seats by using techniques similar to those that have been used for modeling human body shapes. The 3-D contour of twelve driver seats of a pickup truck and sedans were scanned and aligned, and 408 landmarks were identified using a semi-automatic process. A template mesh of 18,306 vertices was morphed to match the scan at the landmark positions, and the remaining nodes were automatically adjusted to match the scanned surface. A principal component (PC) analysis was performed on the resulting homologous meshes. Each seat was uniquely represented by a set of PC scores; 10 PC scores explained 95% of the total variance. This new shape description has many applications. For instance, seats can be classified and grouped, and the distinctive features and dimensions that characterize each group can be identified. Seats can be compared by evaluating a distance metric in PC space. Overall, seat design and benchmarking can benefit from the statistical insight offered by this new approach.
CitationKim, K., Ebert-Hamilton, S., and Reed, M., "Statistical Modeling of Automotive Seat Shapes," SAE Technical Paper 2016-01-1436, 2016, https://doi.org/10.4271/2016-01-1436.
- SAE International Surface Vehicle Recommended Practice, “Motor Vehicle Seat Dimensions,” SAE Standard J2732, Rev. 2008.
- SAE International Surface Vehicle Recommended Practice, “H-point Machine and Design Tool Procedures and Specifications,” SAE Standard J826, Rev. 2008.
- SAE International Surface Vehicle Recommended Practice, “Motor Vehicle Dimensions,” SAE Standard J1100, Rev. 2008.
- Manary, M.A., Flannagan, C.A.C., Reed, M.P., and Schneider, L.W. “Development of an improved driver eye position model,” SAE Transactions: Journal of Passenger Cars, 107: 43-50, 1998.
- Manary, M.A., Reed, M.P., Flannagan, C.A.C., and Schneider, L.W. “ATD positioning based on driver posture and position,” SAE Transactions: Journal of Passenger Cars, 107: 2911-2923, 1998.
- Carr, J.C., Beatson, R.K., Cherrie, J.B., Mitchell, T.J., et al. “Reconstruction and representation of 3D objects with radial basis functions,” Proceedings of the 28th Annual Conference on Computer Graphics and Interactive Techniques, 2001.
- Park, B.K., and Reed, M.P., “Parametric body shape model of standing children aged 3-11 years,” Ergonomics, 1:1-12, 2015.