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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.
Analyze
Apply excitations, analyze the model, and post-process the results.
Diagnostic Options
Display analysis results in a 2D plot.
NCT Effect
Use the NCT Effect option to identifying which NCT contributes to the overall reduction of noise for each response.

Welcome
What's New
View new features for HyperMesh NVH 2026.
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.
- Supported File Formats
  File formats supported by HyperMesh NVH.
- SEAM Preferences
  Keep default configuration options and store user preferences.
- Model Building Sequence
  Follow this sequence when building a model to define all necessary components.
- User Interface
  Explore the user interface.
- Model
  Build models.
- Tools
  When creating a model, use the edit options on the Tools ribbon to modify or recreate the subsystem based on different SEA creations, such as NCTs, Connections, Excitations, Leaks, and so on.
- Analyze
  Apply excitations, analyze the model, and post-process the results.
  - SEA Excitations
    An excitation is generated from an input load. An excitation acts on an SEA subsystem or junction, whereas an input load acts on a SEAM element or connection.
  - Analysis
    Use the Analysis tools to run the model and analyze the results.
  - Plot
    Plot responses from the analysis.
  - Diagnostic Options
    Display analysis results in a 2D plot.
    - Derived Response
      Derive a calculated response.
    - Critical Path Method
      Use Critical Path to identify the critical path for a specific response from a specific excitation.
    - Energy Flow
      Use the Energy Flow option to present the energy flow for a subsystem after running a model.
    - Excitation Contribution
      In a defined load case, the Excitation Contribution option identifies the contribution of each excitation individually in each load case, helping you to identify the dominant excitation in the load case.
    - NCT Effect
      Use the NCT Effect option to identifying which NCT contributes to the overall reduction of noise for each response.
    - Windowing Effect
      Use the Windowing Effect option to identify the REGION that contributes to the overall reduction of noise for each response.
    - Plot Results Using Subsystems
      Plot results using subsystems in the modeling window.
  - Transmission Loss
    Learn how to use the Transmission Loss tool.
  - DOE
    Perform DOE analysis.
- High Frequency NVH Workflow
  Follow the order of these tasks to successfully import, visualize, and post-process an XML model file using high frequency NVH and SEAM.
- Glossary
  Definitions for common terms used in High Frequency NVH.
- SEAM Reference Manual
  Additional resources.
Squeak and Rattle
Create and evaluate evaluation lines and optimize interfaces to eliminate squeak and rattle issues.

NCT Effect

Use the NCT Effect option to identifying which NCT contributes to the overall reduction of noise for each response.

The effect of the NCT is further divided into Transmission Loss and Absorption separately as shown below.