The SISAME (Structural Impact Simulation And Model Extraction) system has been developed by the NHTSA R&D Office of Crashworthiness Research to extract optimal lumped-parameter structural impact models from actual or simulated vehicle crash event data.

SISAME models consist of rigid mass elements connected by massless load-paths. Load-paths can be assigned a range of parametric static and dynamic types, all of which are extractable. SISAME models are generally of moderate complexity and are efficiently simulated by SISAME.

SISAME-3D is designed for modeling the full range of frontal and side impact events and is appropriate for:

• Angled offset and side impact modeling
• Frontal nonoblique impact modeling
• Finite element model tuning to test data
• Optimal structure redesign to meet safety performance and design criteria for 2D and 3D impact conditions
• Large scale simulation studies
• Single and multiple event model extraction

SISAME is designed for modeling events that are effectively uniaxial and is appropriate for:

• Nonoblique frontal full-engagement and offset impacts

• Nonoblique side impacts
• Distillation of finite element impact models to more efficient simulation models
• Tuning finite element models to better match test data
• Optimal structure redesign to meet safety performance and design criteria for uniaxial impacts

The current core SISAME applications are:

SISAME-3D	3D model extraction and simulation program
SISAME	Uniaxial model extraction and simulation program
SISAMEM	Multiple-event uniaxial SISAME program
VeCor	Test data assessment/preprocessing tool
SimFil	Motion filter developed for and used in SISAME