Tutorial for Parametric Constraints Evaluator

Content

SysML Parametric Diagrams provide a way to integrate engineering analysis models described in mathematical equations and constraints, with design models describing the structural and behavioral aspects of systems.

The Parametric Constraint Evaluator (PCE) is an IBM Rational Rhapsody Add-on that allows the evaluation of parametric diagrams using a Computer Algebra System (CAS) such as MAXIMA or MATLAB Symbolic Math Toolbox (MSMT) to solve the mathematical expressions.

PCE translates the SysML diagrams to the CAS specific language; then solves the expressions by calling the CAS. The results of this analysis can be fed back to the design specification by instructing PCE to update the model. PCE is mainly intended to be used for doing engineering analysis directly from the SysML models including examining various design alternatives by comparison (Trade Studies).

Tutorial Pre-requisites:

The Parametric Constraint Evaluator (PCE) Add-on is installed as part of the Systems Engineering Add-ons. It is specific to SysML models.

In addition it is required to install a Computer Algebra System (CAS): either MATLAB Symbolic Math Toolbox or MAXIMA. The order of installation is not important and one can install both CAS tools and switch between them via the PCE Environment Settings dialog (opened via the Tools menu in IBM Rational Rhapsody).

This tutorial describes how to set up and use the parametric constraints evaluator (PCE) for executing parametric diagrams: