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The 2014 THUMS USA Users' Meeting

JSOL is delighted to announce The 2014 THUMS USA Users' Meeting.
THUMS, the Total Human Model for Safety for use with LS-DYNA® is being rapidly adopted by users worldwide.
We invite you to join us and share in THUMS technical information.

Abstract

Time title
10:00- Opening
10:10- History of THUMS developemnt and its enhancement plan in near future
Mr. Tsuyoshi Yasuki, Toyota Motor Corporation
Toyota Motor Corporation and Toyota Central Research and Development Laboratory (Toyota) started development of Total Human Model for Safety (THUMS) in 1997. THUMS Version 1 was completed in 2000 and was used for pedestrian protection research and, whiplash injury at Toyota. Brain model was added to THUMS Version 1 and named THUMS Version 3 and was used for brain injury researches of pedestrian and occupant. THUMS Version 4 was generated from scratch on the basis of CT scanned human geometry to evaluate soft tissues such as internal organ. THUMS has been provided to academic institutes, OEMs, and parts supplier since 2000. Also THUMS is a baseline FE model of several consortiums such as Japan Manufacturers Association (JAMA) and THUMS Users' Committee (TUC) in Europe. Part of researches of Collaborative Safety Research Center (CSRC) includes passive safety research using THUMS by academic institutes in US, Toyota has been enhancing THUMS to expand area of its applications. Future enhancement of THUMS is introduced.
10:40- Injury Investigation for High Speed Racing using THUMS
Mr. Robert D. Smith , Toyota Motor Engineering and Manufacturing North America,Inc. - TTC
The Human FE Model THUMS (Total Human Model for Safety) has been applied in many various uses and applications over the past several years and is continuing to be applied in new ways both in traditional and advanced dynamic crash environments. One such non-traditional application was a joint research project between Toyota Technical Center North America and Toyota Motor Corporation in collaboration with NASCARR studying high speed impacts observed in stock car racing. The purpose of the study was to investigating the mechanism of injury in high speed impacts, primarily focusing on rib fractures. NASCARR crash modes were simulated using a detailed cockpit and racing seat model along with the detailed human Finite Element computer model, THUMS As a result of this research a few modifications to the seat structure design were proposed. NASCARR has implemented two changes to their 2010 Rulebook which are directly related to the findings of this study. The modifications are related to shoulder support and chest support structure for seat design. These changes should lead to a reduced risk of rib fracture injury for both Side and Frontal collision modes. This study was also recognized by SAE for the 2011 SAE Ralph H. Isbrandt Automotive Safety Engineering Award.
11:10- Future Opportunities in combining Pre Crash and Post-crash analysis with THUMS
Mr. Chuck Gulash, Toyota Technical Center (TTC), the North American R&D division of Toyota Motor Corporation
Many new technologies are being researched now, that will be installed in vehicle, can record Pre-Crash and/or post-crash information in an accident. This leads to a great opportunity to use this pre-crash data and to conduct various analysis using Human body models like THUMS. This can help enhance models to simulate accident reconstruction and accident Notification.
11:40- Lunch
12:55- Simulation based THUMS positioning on JSD (JSOL Seat Designer)
Dr. Noriyo Ichinose, JSOL Corporation
THUMS is one of the most detailed human FE model and has quite complex structure of the spine, elbow joint, knee joint, and so on. This precise modeling helps us to investigate injury of human under impact loading but makes model positioning more difficult. Unlike FE dummy model, THUMS has no kinematic joint definition (*Constraint_Joint_XXX) at moving parts. This means that almost pre-processor cannot move THUMS parts to desired position with kinematic calculation. One good approach for THUMS positioning is simulation based positioning. However the simulation requires "know-how" to get proper deformation of moving parts. JSD is one of sled analysis system implemented on Oasys/Primer which is developed by Arup. To build the sled model easily, automatic dummy model positioning with kinematic calculation is implemented on JSD. Now we are extending the positioning feature for THUMS on JSD and investigating proper setting for positioning simulation. In this presentation, THUMS positioning feature on JSD will be introduced and show some investigation results about simulation setting for THUMS positioning..
13:25- Multi-metric evaluation of THUMS in frontal and side impacts
Dr. Damien Subit, University of Virginia
The THUMS finite element model has been evaluated under several loading conditions that are commonly used to evaluate the biofidelity of computational models (frontal, lateral and oblique hub impacts, as well as tabletop belt loading). While these historical data sets provide valuable insight on the response of the human body, they focus on the response of the impacted area, such as the force applied to the thorax by the impactor and the deflection caused by the impact. With the development of new experimental tools, more complete kinematic and kinetic data can be collected: in four inlaboratory test series recently carried out at the University of Virginia . two frontal impacts (with fixed belt, and with force limiting belt) and two side impacts with a rigid wall (without countermeasure, and with a side airbag) . extensive data were collected: the three dimensional kinematics and acceleration of the major bone segments, the loads applied by the restraint systems and wall, and the strain in the ribcage. The objective of this project was to evaluate THUMS under these four loading conditions. To do so, computational models of the loading environments were developed, and the impacts were simulated with THUMS. The same measurements as those obtained during the experiments were calculated from the simulations, and several metrics based on signals correlation were established to compare the response of THUMS to that of the post-mortem human subjects. The performance of THUMS was then evaluated independently for each metric, and also by combining them, so as to characterize the overall performance of THUMS under these loading conditions.
13:55- THUMSv4 Injury Metric Development and Crash Simulation Variation Injury Investigation
Dr. Ashley Weaver, Virginia Tech - Wake Forest University Center for Injury Biomechanics
Recent research at the Virginia Tech-Wake Forest Center for Injury Biomechanics has focused on injury risks in frontal and side impact motor vehicle collisions. Within the past year, an injury risk assessment for a Ford Taurus side impact reconstruction based on data from the Crash Injury Research and Engineering Network (CIREN) was completed. To facilitate the comparison of THUMS response to the real world occupant injuries, injury assessment capabilities were created for the model and integrated with a Matlab graphical user interface. Using commands within Dyna, forces, accelerations, and deflections were measured on the THUMS and compared to injury risk curves from the literature. Moving forward, the frontal impact analysis was intended not only to study a different crash mode, but to also scale the sample size of total accident reconstructions. The paucity of complete vehicle FEMs led to the development of an optimization strategy to modify a FE reduced buck to mimic the occupant and vehicle interactions of specific makes and models. The process varied ten FE vehicle properties relating to airbags, steering column behavior and seatbelts to optimize the injury metrics seen in New Car Assessment Program test data to the FE model results. The first of these optimized simplified vehicle models selected for CIREN case reconstruction and analysis was a 2011 Camry. Preliminary injury risks for the head, torso and lower limbs have been calculated in a similar fashion to the previous side impact collision and the effects of occupant seating configuration in frontal crashes has been quantitatively assessed.
14:25- Parameterize THUMS to Represent Various Vulnerable Populations - A Feasibility Study
Dr. Jingwen Hu, University of Michigan
Small female, elderly, and obese occupants sustain increased risk of death and serious injury in motor-vehicle crashes compared with mid-size young male occupants. However, due to the emphasis on mid-size men in regulatory crash-test procedures, current finite element (FE) human models generally do not account for body shape and composition variations among the population. The greatest opportunity to broaden crash protection to encompass all vehicle occupants lies in improved, parametric human FE models that can represent a wide range of human attributes. In this study, a novel approach to develop such models is proposed. The method includes 1) developing and integrating statistical skeleton and human body surface contour models based on medical image and body scan data using a combination of principal component analysis and regression model, and 2) linking the statistical geometry model to an existing 50th percentile model through an automated mesh morphing algorithm using radial basis functions, so that the model can represent population variability. Examples of using this approach to develop THUMS adult thorax and lower extremity models, as well as obese whole-body human models will be presented. The method proposed in this study enables future safety design optimizations targeting at various vulnerable populations that cannot be considered with current injury assessment tools.
14:55- Closing address

Note: The program is subject to be changed.

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