Investigation of the mass distribution of a detailed seated male finite element model.

Accurate mass distribution in computational human body models is essential for proper kinematic and kinetic simulations. The purpose of this study was to investigate the mass distribution of a 50th percentile male (M50) full body finite element model (FEM) in the seated position. The FEM was partitioned into 10 segments, using segment planes constructed from bony landmarks per the methods described in previous research studies. Body segment masses and centers of gravity (CGs) of the FEM were compared with values found from these studies, which unlike the present work assumed homogeneous body density. Segment masses compared well to literature while CGs showed an average deviation of 6.0% to 7.0% when normalized by regional characteristic lengths. The discrete mass distribution of the FEM appears to affect the mass and CGs of some segments, particularly those with low-density soft tissues. The locations of the segment CGs are provided in local coordinate systems, thus facilitating comparison with other full body FEMs and human surrogates. The model provides insights into the effects of inhomogeneous mass on the location of body segment CGs.

[1]  F. S. Gayzik,et al.  Development of a Full Body CAD Dataset for Computational Modeling: A Multi-modality Approach , 2011, Annals of Biomedical Engineering.

[2]  Saeed Barbat,et al.  Biomechanical Analysis of Human Abdominal Impact Responses and Injuries through Finite Element Simulations of a Full Human Body Model. , 2005, Stapp car crash journal.

[3]  F. S. Gayzik,et al.  External Landmark, Body Surface, and Volume Data of a Mid-Sized Male in Seated and Standing Postures , 2012, Annals of Biomedical Engineering.

[4]  Li Chai,et al.  Prediction and analysis of human thoracic impact responses and injuries in cadaver impacts using a full human body finite element model. , 2003, Stapp car crash journal.

[5]  F. Duck.  Physical properties of tissue , 1990 .

[6]  Costin D. Untaroiu,et al.  A Finite Element Model of the Foot and Ankle for Automotive Impact Applications , 2012, Annals of Biomedical Engineering.

[7]  King H. Yang,et al.  Development of numerical models for injury biomechanics research: a review of 50 years of publications in the Stapp Car Crash Conference. , 2006, Stapp car crash journal.

[8]  J. Crandall,et al.  Rib fractures under anterior-posterior dynamic loads: experimental and finite-element study. , 2010, Journal of biomechanics.

[9]  C. E. Clauser,et al.  Weight, volume, and center of mass of segments of the human body , 1969 .

[10]  Matthew P Reed,et al.  Cervical spine geometry in the automotive seated posture: variations with age, stature, and gender. , 2004, Stapp car crash journal.

[11]  S. M. Beeman,et al.  Kinetic and kinematic responses of post mortem human surrogates and the Hybrid III ATD in high-speed frontal sled tests. , 2013, Accident; analysis and prevention.

[12]  S. Duma,et al.  Evaluation of different projectiles in matched experimental eye impact simulations. , 2011, Journal of biomechanical engineering.

[13]  Tsuyoshi Yasuki,et al.  Development of Next Generation Human Body FE Model Capable of Organ Injury Prediction , 2009 .

[14]  Vladimir M. Zatsiorsky,et al.  The Mass and Inertia Characteristics of the Main Segments of the Human Body , 1983 .

[15]  Costin D. Untaroiu,et al.  A Finite Element Model of the Lower Limb for Simulating Automotive Impacts , 2012, Annals of Biomedical Engineering.

[16]  Zuoping Li,et al.  Influence of mesh density, cortical thickness and material properties on human rib fracture prediction. , 2010, Medical engineering & physics.

[17]  R N Hinrichs,et al.  Adjustments to the segment center of mass proportions of Clauser et al. (1969). , 1990, Journal of biomechanics.

[18]  Joel D Stitzel,et al.  Age and gender based biomechanical shape and size analysis of the pediatric brain. , 2008, Stapp car crash journal.

[19]  Michael L Madigan,et al.  Occupant kinematics in low-speed frontal sled tests: Human volunteers, Hybrid III ATD, and PMHS. , 2012, Accident; analysis and prevention.

[20]  Joel D. Stitzel,et al.  Lateral Impact Validation of a Geometrically Accurate Full Body Finite Element Model for Blunt Injury Prediction , 2012, Annals of Biomedical Engineering.

[21]  M. Panzer,et al.  Cervical Spine Model to Predict Capsular Ligament Response in Rear Impact , 2011, Annals of Biomedical Engineering.

[22]  P. de Leva.  Adjustments to Zatsiorsky-Seluyanov's segment inertia parameters. , 1996, Journal of biomechanics.

[23]  D. H. Robbins,et al.  Anthropometric specifications for mid-sized male dummy, volume 2, and for small female and large male dummies, volume 3. Final report , 1983 .

[24]  F Scott Gayzik,et al.  Bilateral carotid artery injury response in side impact using a vessel model integrated with a human body model. , 2009, Annals of advances in automotive medicine. Association for the Advancement of Automotive Medicine. Annual Scientific Conference.

[25]  Philippe Beillas,et al.  PERFORMANCE OF A 50th PERCENTILE ABDOMINAL MODEL FOR IMPACT: EFFECTS OF SIZE AND MASS , 2012 .

[26]  Masami Iwamoto,et al.  DEVELOPMENT OF A FINITE ELEMENT MODEL OF THE TOTAL HUMAN MODEL FOR SAFETY (THUMS) AND APPLICATION TO INJURY RECONSTRUCTION , 2002 .

[27]  Duane S Cronin,et al.  Finite element modeling of potential cervical spine pain sources in neutral position low speed rear impact. , 2014, Journal of the mechanical behavior of biomedical materials.

[28]  W. T. Dempster,et al.  SPACE REQUIREMENTS OF THE SEATED OPERATOR, GEOMETRICAL, KINEMATIC, AND MECHANICAL ASPECTS OF THE BODY WITH SPECIAL REFERENCE TO THE LIMBS , 1955 .

[29]  Sarah J Manoogian,et al.  The influence of arm position on thoracic response in side impacts. , 2008, Stapp car crash journal.

[30]  Sarah J Manoogian,et al.  Predicting neck injuries due to head-supported mass. , 2006, Aviation, space, and environmental medicine.

[31]  Duane S Cronin,et al.  Cervical spine segment finite element model for traumatic injury prediction. , 2012, Journal of the mechanical behavior of biomedical materials.

[32]  C. E. Clauser,et al.  Anthropometric Relationships of Body and Body Segment Moments of Inertia , 1980 .

[33]  Greg Shaw,et al.  Impact response of restrained PMHS in frontal sled tests: skeletal deformation patterns under seat belt loading. , 2009, Stapp car crash journal.

[34]  Joel D Stitzel,et al.  Computational model of the pregnant occupant: predicting the risk of injury in automobile crashes. , 2003, American journal of obstetrics and gynecology.