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Squeak and Rattle
Create and evaluate evaluation lines and optimize interfaces to eliminate squeak and rattle issues.
Post Processing
Launch and explore Squeak and Rattle Director post processing.

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View new features for HyperMesh NVH 2025.1.
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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
- Model Build
  Convert rigid connections from a NVH model into flexible connections for squeak and rattle assessment.
- Pre-Processing
  Explore the SnRD Pre-Processing user interface.
- Post Processing
  Launch and explore Squeak and Rattle Director post processing.
  - Risk Assessment
    Use the SnR Risk Assessment Browser to load files and post process results.
  - Sensitivity Analysis
    Use a sensitivity analysis to study modal contribution.
  - Combined Loadings Analysis
    Use the Combined Loading tab to review and analyze the effects of Dynamic and Static loads on the gap and relative displacement.
  - Optimization
    Setup an optimization solver deck to get solution proposals.
  - DOE and Stochastics
    Use DOE and Stochastics to understand the parameter variation study.
  - Static Solidity
    Use the Static Solidity Post tool to generate all results of interest for static solidity loadcases.
  - Diagonal Distortion
    Calculate diagonal distortion across the closures and body openings.
  - Report
    Create a report for the risk assessment of the squeak and rattle analysis.
- Ziegler PEM Material Database
  Use of Altair Ziegler SnRD Material Database.

Post Processing

Launch and explore Squeak and Rattle Director post processing.

Post processing requires the solver deck (.fem) exported from the pre-processing module for analyzing the squeak and rattle phenomena.

This solver deck is used throughout post-processing for creation of contour plots.

Note: To perform sensitivity analysis, combined loading analysis and optimization, and risk assessment should be performed first.