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Sequential Perturbation

Sequential Perturbation. Basic method. Three step process Calculate the basic result Calculate the result based on each error limit Put this into a spread sheet Calculate the total error (sum Δ Sigma 2 ). Example. Beam experiment. Uncertainty calculation of surface stress.

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Sequential Perturbation

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  1. Sequential Perturbation

  2. Basic method • Three step process • Calculate the basic result • Calculate the result based on each error limit • Put this into a spread sheet • Calculate the total error (sum ΔSigma2)

  3. Example • Beam experiment

  4. Uncertainty calculation of surface stress. Surface stress Inertia of beam Example

  5. Table values • Nominal: The calculation value with NO error values applied • Sigma + : The calculation assuming the most positive amount of variation for that variable in the calculation • Sigma - : The calculation assuming the most negative amount of variation for that variable in the calculation • Delta Sigma : • Delta Sigma Squared: The square of the calculated value for delta sigma

  6. Example calculation • Nominal Value • Force sigma + • Force sigma – • Delta sigma

  7. Filled table

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