مقایسهٔ روش‌ها

	شمارش جریان باران (Rainflow Counting)	روش قابلیت اطمینان مرتبه اول (FORM)
حوزه	مهندسی قابلیت اطمینان	مهندسی قابلیت اطمینان
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1974	1969
پدیدآور	Tatsuo Endo	Allin Cornell
نوع	Cycle counting algorithm	Reliability analysis method
منبع بنیادین	Goodman, J. (1899). Mechanics Applied to Engineering. Longman, Green and Co.	Cornell, C. A. (1969). A probability-based structural code. Journal of the American Concrete Institute, 66(12), 974-985.
نام‌های دیگر	Rainflow cycle counting, RFC	FORM, First-order second-moment method
مرتبط	4	4
خلاصه	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.	The First-Order Reliability Method (FORM) is a probabilistic technique for estimating the probability of structural failure given uncertain input parameters. Developed by Allin Cornell in 1969 and refined by Hasofer and Lind in 1974, FORM provides a computationally efficient approximation to the true failure probability by linearizing the limit-state function at the most probable failure point. It has become the cornerstone of modern structural reliability analysis and risk-based design.