SISAME2 Program: Structural Crash Model Extraction and Simulation.

摘要

This report contains the user's manual and formulation for the SISAME2 structural impact modeling program. SISAME2 extracts one-dimensional lumped-parameter structural models from crash test data, and performs simulations of such models. SISAME2 uses a combination of a user-specified model configuration and crash test motion and, optionally, force data in a global approximation scheme to find optimal models. Any subset of the load-paths and mass element weights can be extracted from sufficiently complete and accurate sets of test data. The full time span of the test data is used in extracting the parameters for a robust solution. The approximation is based on the full (overdetermined) set of equations of motion for the model's instrumented masses and target equations for specified force histories. The load-paths are parameterized to obtain a tractable problem with a modest number of unknown parameters. Linear inequality constraints are used to assure physically meaningful load-paths. Weighted estimates and/or constraints can be used for any extracted parameter. SISAME2 provides a range of static and dynamic load-path elements, extensive defaults and error checking, and a range of output quantities and formats, and has a friendly, self-documenting user-interface. Sophisticated algorithms are incorporated to ensure efficient reliable extractions and simulations.