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selectASET User Guide |
The selectASET routine is a MATLAB-based program that helps select accelerometer locations for a modal vibration test. This process starts with a candidate set of potential accelerometer degrees of freedom (DOF) and iteratively removes the least-important DOF until the user-defined orthogonality error or number of DOF is achieved. This routine can accommodate multiple finite element model (FEM) configurations, selecting the best set of accelerometers for multi-configuration modal tests to minimize test setup time.
Several key features of the selectASET routine:
• Direct Nastran compatibility—Nastran data can be generated for import into selectASET using standard Nastran cards, and the optimal accelerometer set can be written directly to Nastran ASET cards.
• Works with multiple FEM configurations—selectASET can simultaneously select accelerometer locations on multiple FEM configurations to minimize setup time for multi-configuration modal tests.
• Manual accelerometer location selection—The user can manually select accelerometer locations to improve mode shape visualization of test-display models.
• Triaxial accelerometer selection—selectASET can operate on individual DOF or triaxial accelerometer locations.
• Command line execution—selectASET can be run interactively through the graphical user interface (GUI) or can be executed from the command line, enabling scripting or batch execution.
• GUI-driven operation—The GUI allows the user full control over the solution parameters and streamlines post processing and interrogation of results.
• Error function formulation—selectASET uses industry-standard pseudo-orthogonality or self-orthogonality error metrics to rank the importance of each DOF/triaxial accelerometer.
• Provides orthogonality error sensitivity feedback—selectASET stores intermediate results so the user can examine the sensitivity of the orthogonality error to changes in the number of accelerometers.
• Interface with Microsoft Excel through XML—Orthogonality, modal assurance criterion (MAC), and frequency comparisons can be exported to Excel-compatible XML format to document results.