10. RFlex

Figure 10.1 RFlex example

RecurDyn/RFlex analyzes the dynamic stress and strain of the system containing both a rigid and an RFlex body made through the superposition of a mode shape. Nonlinear effects such as local deformation contact are absent from the analysis of the RFlex body motion, but the analysis can be performed on a large model.

• Use of model data made by CAD and commercial mashers

• Selection of mode and frequency with the animated mode shape for the RFlex body

• Stress and strain mode are made by the external FEM package

• Calculated stress and strain mode from the deformation mode

• Creation of the input file for the analysis in the external FEM package for the stress and correction mode analysis

• 10.1. RFlex Dynamics
  • 10.1.1. Equations of Motion using Modal Approach
  • 10.1.2. Invariant Variables
  • 10.1.3. Nodal Equations of Motion
  • 10.1.4. RFlex Body Reference Frame
  • 10.1.5. Strain Energy
  • 10.1.6. Kinetic Energy
  • 10.1.7. Correction Mode
    • 10.1.7.1. Static Correction Mode
    • 10.1.7.2. Orthonormalization with respect mass matrix
  • 10.1.8. Stress Analysis
    • 10.1.8.1. Strain Shapes matrix
    • 10.1.8.2. Stress Shapes matrix
• 10.2. RFlex Interface
  • 10.2.1. ANSYS Interface
    • 10.2.1.1. Interface Dialog
      • 10.2.1.1.1. Interface Options
    • 10.2.1.2. Generation of Input File
      • 10.2.1.2.1. CMS Analysis (Mechanical APDL)
      • 10.2.1.2.2. CMS Analysis (Workbench)
      • 10.2.1.2.3. Modal Analysis (Mechanical APDL)
  • 10.2.2. NX/NASTRAN Interface
    • 10.2.2.1. DMAP Command
    • 10.2.2.2. Examples
    • 10.2.2.3. CMR of RS
      • 10.2.2.3.1. CMR of RS Theory
      • 10.2.2.3.2. CMR of RS Specification
      • 10.2.2.3.3. Mixed Boundary Reduction
      • 10.2.2.3.4. Example
  • 10.2.3. MSC/NASTRAN Interface
    • 10.2.3.1. Interface Dialog
      • 10.2.3.1.1. Interface Options
    • 10.2.3.2. Generation of Input File
      • 10.2.3.2.1. Modal Analysis
    • 10.2.3.3. DMAP Command
      • 10.2.3.3.1. DMAP for Modal Analysis (*.op2)
      • 10.2.3.3.2. DMAP for Modal Analysis (*.pch)
      • 10.2.3.3.3. DMAP for CMS Analysis (*.out)
  • 10.2.4. I-DEAS Interface
    • 10.2.4.1. Interface Dialog
      • 10.2.4.1.1. Interface Options
    • 10.2.4.2. Generation of Input File
      • 10.2.4.2.1. Modal Analysis
      • 10.2.4.2.2. CMS Analysis
  • 10.2.5. Edit RFl file
    • 10.2.5.1. Create an input File
      • 10.2.5.1.1. ANSYS
      • 10.2.5.1.2. NX/NASTRAN
      • 10.2.5.1.3. MSC/NASTRAN
    • 10.2.5.2. Add data to RFI file
• 10.3. RFI Optimizer
  • 10.3.1. NX Nastran
    • 10.3.1.1. How to make the OP2 file
    • 10.3.1.2. Another method for generating the OP2 file
  • 10.3.2. Update RFI file
• 10.4. RFI Translator
• 10.5. Import RFlex Body
  • 10.5.1. Modeling Options
  • 10.5.2. Properties
    • 10.5.2.1. Graphic Property Page
    • 10.5.2.2. RFlex Page
      • 10.5.2.2.1. Options
    • 10.5.2.3. FEInfo. Page
    • 10.5.2.4. Node Scope Page
• 10.6. Reassociation of RFI File
• 10.7. Strain Stress Shape Generation
• 10.8. Edit Functions for RFlex body
• 10.9. RFlex Loads
  • 10.9.1. RFlex Modal Force
    • 10.9.1.1. RFlex Modal Load Case
      • 10.9.1.1.1. Definition Modal Load
    • 10.9.1.2. RFlex Modal Force
    • 10.9.1.3. RFlex Modal Preload
  • 10.9.2. Modal Pressure Loads
• 10.10. Contact in RFlex
• 10.11. Post Process in RFlex
• 10.12. Output Regenerator
• 10.13. Export FEA Loads Data
  • 10.13.1. Force Definition
  • 10.13.2. Output Format
    • 10.13.2.1. ANSYS output
    • 10.13.2.2. MSC/NASTRAN output
    • 10.13.2.3. Design Space output
• 10.14. Durability Interface
• 10.15. MDF Export
  • 10.15.1. How to apply MDF file in NX Nastran