手法を比較

	レインフロー計数法	一次信頼性解析法（FORM）
分野	信頼性工学	信頼性工学
系統	Process / pipeline	Process / pipeline
提唱年	1974	1969
提唱者	Tatsuo Endo	Allin Cornell
種類	Cycle counting algorithm	Reliability analysis method
原典	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.
別名	Rainflow cycle counting, RFC	FORM, First-order second-moment method
関連	4	4
概要	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.