LMS Virtual.Lab Correlation

Structural correlation and FE model validation for high fidelity simulations

To guarantee realistic high fidelity simulations, simulation models meet stringent accuracy standards. To ensure reliable simulation results, you must compare component, subsystem and full system models with experimental data or validated models of similar structures. Building and validating system models from the bottom up is the only way to prevent accumulating inaccuracies. In addition to more reliable what-if analysis, validated models provide a better understanding of assumptions regarding material properties, connections, joints and boundary conditions.

Although static physical tests serve many design purposes, models used for vibro-acoustic simulations usually require systematic test-based validation of dynamic properties. LMS Virtual.Lab Correlation helps correlate physical test results and prepare structural tests. A comprehensive tool set significantly facilitates simulated and measured mode shape comparison and operational deflection shapes and response functions. Use the original finite element (FE) model as a basis to provide optimal comparison positions and the required number of excitation and response points to avoid testing errors and redundancy.

Deducing model improvements using validation output is not always obvious. To facilitate model updating driven by validations, LMS Virtual.Lab Correlation offers specialized features to identify specific locations that need improvement. For example, it runs sensitivity analysis that efficiently retain the most influential specified parameters. You can also automatically update models using internal and external algorithms, such as Nastran Solution 200, which focuses on tuning modal frequencies and response functions.

Structural Correlation and Pre-test Analysis

Correlation - Structural Correlation and Pre-test Analysis

When preparing measurements for physical structures, using modal information of preliminary finite element models to define the optimal measurement setup is called pre-test analysis. After good test data for the physical model is available, structural correlation analysis allows you to quantify the geometrical and dynamic, such as frequency response function (FRF) and modal, resemblance between the test model and its equivalent FE model.

 

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Model Updating

Correlation - Sensitivity Analysis and Model Updating

After dynamic correlation, LMS Virtual.Lab allows you to easily set up and drive Nastran Sol200 to obtain the sensitivity of FE dynamic properties. You can use those properties toward a set of design parameters to decide which parameters to change for better structural correlation results. Using Sol200 sensitivities, you can derive modal assurance criterion (MAC) and frequency difference sensitivities for modal updating.

 

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