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Squeak and Rattle
Create and evaluate evaluation lines and optimize interfaces to eliminate squeak and rattle issues.
Pre-Processing
Explore the SnRD Pre-Processing user interface.
Setup
Use the tools in the Setup Group to setup evaluation lines and define loadcases.
Manage E-Points
Use the Manage E-Points tool to modify local system collectors and evaluation points.

Welcome
What's New
View new features for HyperMesh NVH 2024.1.
Get Started
Learn the basics and discover the workspace.
Tutorials
Discover NVH functionality with interactive tutorials.
Full Vehicle NVH
Access the Assemble, Analyze, NVH Tools, NVH Post, and Physics AI ribbons.
High Frequency NVH
High frequency NVH is an implementation of Statistical Energy Analysis (SEA), and is used to predict and analyze the vibration and acoustic response of complex dynamic systems.
Squeak and Rattle
Create and evaluate evaluation lines and optimize interfaces to eliminate squeak and rattle issues.
- Technical Concepts
  Technology and problem evaluation approaches used in SnRD.
- Launch Squeak and Rattle Director
- Pre-Processing
  Explore the SnRD Pre-Processing user interface.
  - Setup
    Use the tools in the Setup Group to setup evaluation lines and define loadcases.
    - Import Model
      Import all data required for the squeak and rattle analysis preparation.
    - Define Interface
      Use the Define Interface tool to create, import, and edit geometric lines along the interfaces to evaluate.
    - Create E-Lines
      Use the Create E-Lines tool to create evaluation lines at component interfaces.
    - Manage E-Lines
      Use the Manage E-Line tool to review and manage E-Lines.
    - Loadcase Setup
      Setup loadcases to solve and extract results.
    - Variability Study
      Use a variability study to examine how squeak and rattle risks are affected by manufacturing variations.
    - Manage E-Points
      Use the Manage E-Points tool to modify local system collectors and evaluation points.
      - Rotate LCS
        Use the Manage E-Points tool to rotate LCS on an evaluation point.
      - Update RBE3
        Relocate the RBE3 elements of an realized E-line to a nearby element to ensure a proper definition of the E-point elements.
  - Analyze
    Evaluate loadcase and export solver deck.
- Post Processing
  Launch and explore SnRD Post Processing.
- Ziegler PEM Material Database
  Use of Altair Ziegler SnRD Material Database.

Manage E-Points

Use the Manage E-Points tool to modify local system collectors and evaluation points.

For quick risk analysis of an E-Line, you may need to modify or reduce the number of evaluation points on E-Lines. You may also have to modify the local system collector orientation.

Use the Manage E-Points tool to delete connections and rotate Local Coordinate Systems (LCS).

Using the Manage E-Points tool, you can complete the following:

Rotate LCS to ensure it is properly aligned with the actual gap direction.
Delete connections in places where they are not needed to speed up simulation and post processing.
Restriction: This workflow is not supported from 2022.1 onward.
Relocate the RBE3 elements of the realized E-Line to a nearby element to ensure a proper definition of the E-point elements.

Important: All changes made using the Manage E-Points tool will be lost if the E-Line connector is re-realized.