Function and Methods

SISAME performs lumped-parameter Structural Impact Simulation And Model Extraction for uniaxial vehicle impact events. Static and dynamic load-path parameters and mass weights can be extracted for given motion and/or force data with a user-supplied model configuration. Fully defined models can be used to simulate a range of events.

SISAME uses a global approach to find the optimal model parameters. Simulation is performed with standard integration techniques.

SISAME is an object-oriented implementation of SISAME in the C++ programming language that has no model size limits.

Features and Options

SISAME provides a number of static and dynamic types. Masses can be simulated or have motions specified by instrument data. A fixed barrier/ground element is also available. Models can have more extracted load-paths than targeted motions. Defined and extracted load-paths can be combined in the same SISAME run, as can instrumented and simulated masses. Instrumented mass motions are filtered to a user-specified cutoff frequency with a special simultaneous motion filter (based on the SimFil program). Extraction iterations are performed when model features preventing a one-pass solution are present.

SISAME is driven by a self-documenting ASCII input file that specifies the run, model, and output information. Extensive defaulting and input checking are performed. A variety of outputs is available in printed or UDS file format. SISAME can produce a simulation-ready extracted model file.

Setup and Run Instructions

The command line syntax is: SISAME [input_file]

SISAME will prompt for an input file if none is specified on the command line. A log file containing summary information is created with a .log extension.

Known Problems and Constraints

SISAME modeling is inherently sensitive to motion data errors, particularly when accelerations are provided and small-deflection load-paths are being extracted. The VeCor program can be useful in assessing and correcting motion data prior to its use with SISAME.

Additional Documentation

See The SISAME Program: Structural Crash Model Extraction and Simulation for complete SISAME documentation.

A template for the input file can be found in the SISAME Input Template.

A history of program changes can be found in the SISAME Change Log.