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  • ANSYS MECHANICAL

Your FEA Model Says One Thing. Your Test Rig Says Another. Here's How to Fix That.

A practical guide to correlating experimental modal analysis with Ansys Mechanical simulation — so your NVH predictions hold up long before a physical prototype ever hits the test bench.
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Test vs. Simulation Overlay MAC 0.96
Experimental (EMA) Baseline FEA Correlated FEA
  • The Problem

Why "it works in simulation" keeps failing on the test bench

Most NVH surprises aren’t caused by bad engineering — they’re caused by a simulation model that was never checked against reality before it was trusted.

Idealised boundary conditions

"Fully fixed" and "perfectly bonded" don't exist on a real mounting bracket. FEA run on those assumptions predicts frequencies that a physical prototype will never actually show.

Resonances found
too late

Whines and buzzes discovered after tooling is committed often mean redesigning housings and re-cutting dies — costs that simply didn’t exist at the concept stage.

Test and simulation, disconnected

EMA data sits in one report, FEA results sit in another, and no one is systematically comparing mode shapes — only frequencies, which tells half the story.

  • The Fix

A repeatable correlation workflow, built around Ansys Mechanical

The white paper walks through all 8 steps in detail. Here’s the shape of the process:
Import Test Data
Measured FRFs & mode shapes from EMA
Build Baseline FEA
Mesh, joints, realistic boundaries
Pair Modes (MAC)
Match test & FEA mode shapes
Tune Parameters
Stiffness, damping, mass, guided by sensitivity
Lock & Reuse
Validated model for every future iteration
  • What's Inside

11 sections, written for engineers who need to act on it Monday morning

No fluff, no vague promises — just the methodology, the metrics, and a worked example.

Executive Summary

The business case in three numbers

Why HPC Matters

From warranty cost to brand perception

The Test-Simulation Gap

Six real sources of disagreement

EMA vs. FEA Fundamentals

What each method actually measures

Correlation Metrics

Frequency deviation, MAC, FRF overlay

Step-by-Step Workflow

The full 8-step Ansys Mechanical process

Case Example

Correlating a geared motor assembly

Pitfalls & Best Practices

What quietly ruins a correlation study

Business Impact

Time, cost and quality, quantified

Getting Started

How Corengg scopes an implementation

About Corengg

Our Ansys practice in South India

45–60%

Typical reduction in late-stage NVH rework when correlation is built into the design cycle

3–5

Design iterations that can shift from physical prototypes to simulation once a model is correlated

±5%

Frequency deviation generally considered an acceptable correlation target

Illustrative industry ranges cited for context in the white paper; actual outcomes vary by product and modelling maturity.

  • Illustrative Case

Tracing a gearbox whine back to a single structural mode

A geared motor assembly is flagged for an audible whine at a specific operating speed. Baseline FEA disagrees with test data on two lower modes — joint stiffness was idealised as fully rigid, pushing predicted frequencies higher than reality.

After tuning boundary and joint stiffness within physically realistic ranges, frequency deviation falls within target tolerance and MAC confirms every mode is correctly matched.
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Illustrative MAC matrix — strong diagonal = correct mode pairing
  • DOWNLOAD

Get the full white paper, free

Fill in your details once and the PDF unlocks immediately — complete with a table of contents, correlation metrics explained, and the full workflow breakdown.
  • 11-section PDF white paper with a full table of contents
  • The 8-step Ansys Mechanical correlation workflow
  • Illustrative geared motor correlation case study
  • A best-practices checklist you can apply on your next program

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