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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.
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.
Mount Optimization - Study Tab
Perform sensitivity studies for mount position and stiffness. You can also perform an optimization setup to calculate the optimized mount stiffness and location layout for decoupling powertrain rigid body modes and frequency spacing.
Deterministic Optimization
Set up a deterministic optimization and execution defining the objective of decoupling rigid body modes, creating constraints for rigid body mode frequencies, and specifying design space for variables in terms of mount stiffness, locations, and inclinations.

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.
- 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.
  - 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.
    - Mount Optimization - Load Tab
      Enter the powertrain and mounting configuration data manually or load the data from a configuration file. Mount stiffness can be static or non-linear.
    - Mount Optimization - Display Tab
      Review rigid body mode frequencies and corresponding kinetic energy distribution. Right-click on the context menu to display and visualize rigid body modes.
    - Mount Optimization - Study Tab
      Perform sensitivity studies for mount position and stiffness. You can also perform an optimization setup to calculate the optimized mount stiffness and location layout for decoupling powertrain rigid body modes and frequency spacing.
      - Sensitivity
        Define design variables and output responses to set up and execute design of experiments (DOE).
      - Deterministic Optimization
        Set up a deterministic optimization and execution defining the objective of decoupling rigid body modes, creating constraints for rigid body mode frequencies, and specifying design space for variables in terms of mount stiffness, locations, and inclinations.
      - RBDO
        Set up a reliability-based optimization (RBDO) and execution by defining objective of decoupling rigid body modes, creating constraints for rigid body mode frequencies and specifying design space for variables in terms of mount stiffness, locations, and inclinations.
  - 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.

Deterministic Optimization

Set up a deterministic optimization and execution defining the objective of decoupling rigid body modes, creating constraints for rigid body mode frequencies, and specifying design space for variables in terms of mount stiffness, locations, and inclinations.

Specify design space for design variables.

Figure 1. Mount Optimization Utility - Study Tab - Determinisitc Optimization sub-tab - Des. Vars.

Define the objective for the rigid body mode decoupling criteria.

Figure 2. Mount Optimization Utility - Study Tab - Determinisitic Optimization sub-tab - Objective

Create constraints for rigid body mode frequencies and mount stiffness, and submit an optimization run.

Figure 3. Mount Optimization Utility - Study Tab - Deterministic Optimization sub-tab - Constraint

From the Display tab, display and compare rigid body mode frequencies and kinetic energy, baseline vs. optimized. A comparison review is shown of the design variables, optimized vs. baseline. You can save the configuration file with optimized design variables for further studies.

Figure 4. Mount Optimization Utility - Study Tab - Deterministic Optimization sub-tab - Display