Verification and Validation of Simulink Models: Building Confidence in Simulation Results

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Verification asks whether a model has been implemented correctly according to its intended design, while validation considers whether the model is an adequate representation of the real-world system.

A simulation can produce convincing graphs without necessarily representing the real system correctly. This is why verification and validation are important when developing engineering models. Verification asks whether a model has been implemented correctly according to its intended design, while validation considers whether the model is an adequate representation of the real-world system.

Students may encounter model requirements, numerical accuracy, simulation testing, parameter checking, reference data, experimental comparison, sensitivity analysis, error identification, and performance evaluation. The challenge is often knowing what evidence is needed to demonstrate that a model is both technically correct and suitable for its intended purpose.

A useful approach is to establish expected behaviour before testing the model. Students can check individual blocks and calculations, examine signal connections and parameters, and compare simulation outputs with analytical solutions or reliable reference data. Testing different operating conditions can reveal errors that may remain hidden under a single scenario.

Validation also requires careful interpretation of differences between simulated and observed results. Small discrepancies may arise from assumptions, measurement uncertainty, parameter estimates, or simplifications within the model. Rather than automatically treating every difference as an error, learners should investigate its likely cause.

When model assessment becomes difficult, focused academic guidance can help learners design verification tests, compare simulation results with reference evidence, identify modelling errors, evaluate assumptions, and clearly explain whether their Simulink model is reliable for its intended application.

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