MATLAB Implementation of the Rainflow Counting Method

The Rainflow Counting Method is a technique based on the time axis that calculates various extremes following rainfall runoff patterns to form local cycles. This method assists engineers in better understanding hydrological cycles during analysis and design processes, providing precise data for hydrological models. In implementation, the algorithm typically involves peak-valley extraction, cycle identification through rainflow principles, and cycle counting statistics. Key MATLAB functions for implementation may include: - Data preprocessing: Smoothing input signals using filter functions - Peak detection: Utilizing findpeaks() to identify local maxima and minima - Cycle identification: Implementing the four-point rainflow algorithm to determine closed hysteresis loops - Cycle counting: Classifying cycles based on amplitude and mean values In the Rainflow Counting Method, the time axis is rotated vertically, which facilitates better visualization of hydrological cycles. Through this approach, engineers can gain deeper insights into the complexity of hydrological cycles and develop more accurate solutions to address various hydrological challenges. The method is particularly valuable for fatigue analysis and stress cycle counting in engineering applications.