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Full Vehicle NVH
Access the Assemble, Analyze, NVH Tools, NVH Post, and Physics AI ribbons.
Post-processing and Diagnostics
Define radiation conditions and create emissivity models.
Modal Participation
Plot modal/panel participation curves from an OptiStruct .h3d file or an MSC Nastran .f06/.pch file.
Modal Participation - Load
Perform file and result selection.

Welcome
What's New
View new features for HyperMesh NVH 2025.1.
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.
- Assembly
  Learn how to create, open, import and save models.
- Analysis
  Set up the simulation model, materials, domains and boundaries.
- NVH Tools
- Prepare Module
  Create, organize and manage the CAE parts.
- Post-processing and Diagnostics
  Define radiation conditions and create emissivity models.
  - Load an NVH Utility
  - Integrated Diagnostics
    Calculate a response, perform contribution analysis, plot results, and perform diagnostic studies and study response changes.
  - Modal Participation
    Plot modal/panel participation curves from an OptiStruct .h3d file or an MSC Nastran .f06/.pch file.
    - Modal Participation - Load
      Perform file and result selection.
    - Modal Participation - Display
      After populating the Load tab, select a method to display the participation data.
    - Modal Participation - Study
      After plotting modal/panel participation curves, perform a Partial sum or Contributor overlay response study.
  - Grid Participation
    The Grid Participation utility allows you to plot panel grid participation results and then use advanced scaling contour capabilities to isolate key contributing areas.
  - Energy Distribution
    Visualize the distribution of energy within a full vehicle NVH model, as a way to understand what components are dominating the vehicle response.
  - Transfer Path Analysis
    Identifies the complex contribution of the excited structure through attachment points to a response in the responding structure.
  - Design Sensitivity Analysis
    Design sensitivity represents a change in response with respect to a change in a design variable, which is typically used for optimization.
  - Order Analysis
    Generates and post-processes engine order related data from an OptiStruct or Nastran frequency response analysis that contains either RPM-based loading subcases or order-based loading subcases.
  - Modal FRF
    Calculate a frequency response based on modal results.
  - Model Correlation
    The Model Correlation utility determines the degree of similarity or correlation between two sets of results.
  - Radiated Sound
    The Equivalent Radiated Sound utility post-processes the results of exterior structure-borne radiated sound.
  - Global Modes
    Identifies global modes from an OptiStruct or Nastran modal analysis.
  - Flow Induced Noise/General Signal Processing
    The General Signal Processing utility processes the time domain pressure results from CFD simulations and visualizes the results in both the time and frequency domain.
  - Green House Noise
    Post-process the pressure result of a vehicle panel obtained from ultraFluidX.
  - Mount Optimization
    Predicts powertrain rigid body mode frequencies and kinetic energy distribution, which play a critical role in optimizing the mount stiffness and layout configuration, by decoupling powertrain rigid body modes and reducing vibration transmission.
  - Optimization, RBDO
    Optimizes sensitive parameters for multiple sample analysis results using the RBDO or Deterministic approach.
  - Multiple Sample Analysis
    Post-process results from a Multiple Sample Analysis, including plotting a spread of responses (+/-95% and mean).
  - Deterministic Optimization
    Reads results from an OptiStruct optimization run and processes the results to review the overlay of the NVH responses, baseline versus optimized. Compare changes in the design variable values, baseline versus optimized.
  - Display Options
    Customize plots using the following options
  - Filter Contributors
    Filters contributors to a smaller set of data.
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.

View All Altair HyperWorks Help

Modal Participation - Load

Perform file and result selection.

File selection

From the Load tab > File selection/Participation results, select an OptiStruct .h3d file or an MSC Nastran .f06/.pch file and click Load. Upon reading the file, the Result selection fields are populated.

Result selection

The following fields are available under Result selection. Once the result selection options are complete, select Load Response to further investigate the participations.

Subcase

Select an analysis subcase.

Result type

Select a participation result type. Options include:

System Structure Modal Participation to Acoustic Grid
System Fluid Modal Participation to Acoustic Grid
System Structure Modal Participation to Panel
System Structure Modal Participation to Structure Grid
Component Structure Modal Participation to Acoustic Grid
Component Fluid Modal Participation to Acoustic Grid
Component Structure Modal Participation to Structure Grid
Panel Participation to Acoustic Grid
ERP Modal Participation Factors

Response ID

Grid ID of the response for which Modal/Panel participation results are available. Select one from the list.

Response label (optional)

Enter a label that describes the response, for example "Driver’s Ear".

Direction component

X, Y, or Z.

Result set (optional)

Select from Structural Mode, Acoustic Mode, Panels

Display Options

The Display Options dialog allows you to customize the response plot, including scale, weighting, and the plot layout.

Load Response

Once the result selection options are complete, select Load Response to display the file data.