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	Aggiornamento e Calibrazione del Modello agli Elementi Finiti	Conteggio Rainflow
Campo	Ingegneria dell'affidabilità	Ingegneria dell'affidabilità
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	2001	1974
Ideatore	John Mottershead and Michael Friswell	Tatsuo Endo
Tipo	System identification methodology	Cycle counting algorithm
Fonte seminale	Mottershead, J. E., Link, M., & Friswell, M. I. (2011). The sensitivity method in finite element model updating: A tutorial. Mechanical Systems and Signal Processing, 25(7), 2275-2296.	Goodman, J. (1899). Mechanics Applied to Engineering. Longman, Green and Co.
Alias	Model updating, Model calibration, FEM updating	Rainflow cycle counting, RFC
Correlati	4	4
Sintesi	Finite Element Model (FEM) Updating is the process of refining a numerical structural model to match measured behavior (modal properties, vibrations, static displacements) from the physical structure. By comparing computational predictions to experimental data and systematically adjusting uncertain model parameters (material properties, boundary conditions, joint stiffness), engineers create more accurate models for design decisions, damage detection, and life prediction. Formalized by Mottershead and Friswell, FEM updating bridges the gap between idealized computer models and real-world structures.	Rainflow counting is a fatigue cycle counting method that converts a complex stress history into individual cycles for damage assessment. Developed by Tatsuo Endo and colleagues in 1974, it provides the most physically realistic representation of fatigue damage when combined with Miner's linear cumulative damage hypothesis. The algorithm has become the industry standard in reliability engineering and vibration analysis.