مقایسهٔ روش‌ها

	به‌روزرسانی و کالیبراسیون مدل اجزای محدود	شمارش جریان باران (Rainflow Counting)
حوزه	مهندسی قابلیت اطمینان	مهندسی قابلیت اطمینان
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	2001	1974
پدیدآور	John Mottershead and Michael Friswell	Tatsuo Endo
نوع	System identification methodology	Cycle counting algorithm
منبع بنیادین	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.
نام‌های دیگر	Model updating, Model calibration, FEM updating	Rainflow cycle counting, RFC
مرتبط	4	4
خلاصه	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.