השוואת שיטות

	עדכון וכיול מודל אלמנטים סופיים	ספירת גשם
תחום	הנדסת אמינות	הנדסת אמינות
משפחה	Process / pipeline	Process / pipeline
שנת המקור	2001	1974
הוגה השיטה	John Mottershead and Michael Friswell	Tatsuo Endo
סוג	System identification methodology	Cycle counting algorithm
מקור מכונן	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.
כינויים	Model updating, Model calibration, FEM updating	Rainflow cycle counting, RFC
קשורות	4	4
תקציר	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.