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ProFES

Walkthrough

The ProFES Application allows you to perform advanced probabilistic analysis on existing deterministic models without being an expert in probabilistic mechanics. Currently you can import ANSYS "db" files, archives, or parametric models as well as NASTRAN bulk data files or PATRAN session files. You then describe the uncertainty in loads, material properties, element properties, and boundary conditions using random variables and describe the failure criteria for your model using Limit-states. If you import PATRAN session files which load Unigraphics geometry parts, you can also describe the uncertainty in geometry (by changing the Unigraphics features) in addition to describing uncertainties in loads, boundary conditions, and material properties. ProFES calculates the reliability of the component.

The ProFES GUI provides many paths for you to edit the current probabilistic problem. The ProFES GUI guides you through the process of specifying what variables are uncertain and specifying the failure criteria or limit-state function.

Once the problem is defined you can perform an analysis selecting from Monte-Carlo Simulation, First Order-Second Moment Analysis (FOSM), or First Order Reliability Method (FORM). Results of the analysis can be viewed in many different formats including cumulative distribution curves, histograms, and sensitivity summaries.

All random quantities are created through similar dialog boxes. Any finite element response quantities (displacements, stresses, etc.) or your own response quantity can be used in the limit-state functions. Graphic and report style results are generated for each probabilistic analysis. All previous analyses can be stored and reloaded.

ProFES can be used independently of FEM codes. You can use the internal equation parser to type equations that define response variables. Equations are entered in a simple syntax. ProFES parses and compiles your equation for execution as probabilistic analysis is run. You can also call existing executable code using the external function response type. Internal and external function can be used with FEM analysis to model fatigue, fracture, or other post processing analysis.

Pro-FES®

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ProFES control window

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The figure shows the ProFES application with a solid beam model (HEX8 elements) imported. The load on the beam has been selected to be random. The user has assigned a 12% coefficient of variation to the value of the load.

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The ProFES user interface provides a consistent and robust environment for creating and editing probabilistic models from your existing finite element models. For example, shown below is the Material Properties dialog box. The materials and material parameters are read from the original finite element model. No additional input is necessary. Selecting a parameter and clicking the Add button makes this quantity a random variable.

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