Compara mètodes

	Actualització i Calibració de Models d'Elements Finits	Comptatge Rainflow
Camp	Enginyeria de fiabilitat	Enginyeria de fiabilitat
Família	Process / pipeline	Process / pipeline
Any d'origen	2001	1974
Autor original	John Mottershead and Michael Friswell	Tatsuo Endo
Tipus	System identification methodology	Cycle counting algorithm
Font seminal	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.
Àlies	Model updating, Model calibration, FEM updating	Rainflow cycle counting, RFC
Relacionats	4	4
Resum	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.