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RecurDyn Expression Portal

RecurDyn Expression

RecurDyn allows users to write simple programming expressions that are executed and evaluated during the simulation of a model. Expressions are text strings like sin(5*time) that can be used for many purposes in RecurDyn, such as to specify the position of a body that varies with time, to specify a reaction force, or to create a user-defined constraint equation.

Expressions are written directly in RecurDyn/Modeler, and provide a very simple but very powerful way for users to control parts of a model or generate data that can be analyzed after a simulation.

▶ Expression Function Handbook (Download)

FAQ

Why doesn’t the PV change during the simulation despite the expression changing?
What caused the following error? 'The connector which is indicated by the 1st parameter and the 2nd parameter must be same one.'
What does ‘D’ mean in STEP (TIME, 0, 0, 1, 360D)?
Is a floating marker available in Expression?
Where can I find how to use Expression function? What is Expression Helper?

Tips

  1. How to easily create Expression using Excel (Signal Chart: Time Type)
  2. Solver – Becoming an Experienced User #4 – Simulation Parameter #1
  3. How to create Expressions using Excel (Signal Chart)
  4. Let's try Expression Helper!
  5. GoPowerUser, Fourth Episode: A Guide to Using RecurDyn Expression Functions (Various Load Conditions)
  6. GoPowerUser, 3rd Episode: A Guide to Using RecurDyn Expression Functions (IF and STEP)
  7. RecurDyn Contact - Becoming an Experienced User, 2nd Episode: Solid / Geo Contact Objects
  8. Applying Test-measured Spline Data to RecurDyn
  9. GoPowerUser, First Episode: A Guide to Using RecurDyn Expression Functions (Basic)

Expression Helper

Helpers
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