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## Webinar 34 Rainflow Fatigue for Continuous Beams

PowerPoint Slides: webinar_34_rainflow_fatigue_beam.pptx Audio/Visual File: Rainflow_Cycle_Counting_for_Continuous_Beams.wmv YouTube version * * * References: Steinberg’s Vibration Analysis for Electronic Equipment Rainflow Fatigue Posts * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata Webinars Thank you, Tom Irvine

## Webinar 33 Rainflow Fatigue

PowerPoint Slides: Webinar_33_Rainflow_Fatigue.pptx Audio/Visual File: Rainflow_Cycle_Counting.wmv YouTube version * * * References: Steinberg’s Vibration Analysis for Electronic Equipment Rainflow Fatigue Posts * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata Webinars Thank you, Tom Irvine

## SDOF Response to Sine or Sine Sweep Base Input, Rainflow

Rainflow fatigue cycles can be easily calculated for a single-degree-of-freedom subjected to a sine or sine sweep base input.  The reason is that each pair of consecutive positive and negative response peaks forms a half-cycle. The relative fatigue damage can then be calculated from the rainflow cycles. Here are Matlab scripts for performing the rainflow […]

## Dirlik Rainflow Counting Method from Response PSD

A number of methods have been derived for performing rainflow cycle counting for a response PSD. Note that they tend to be conservative. The Dirlik method is an example of a semi-empirical method for cycle identification. A Matlab script for performing this method is given at: Dirlik_rainflow.zip * * * The following script calculates the […]

## Miner’s Cumulative Fatigue via Rainflow Cycle Counting

This blog entry is a work-in-progress. Fatigue analysis can be performed in the time domain using rainflow cycle counting.   This is an elegant, brute-force approach.  One advantage of the time domain approach is that it tends to highlight the occurrences of peaks above 3-sigma for the case of random vibration. These higher peaks can also […]

## Rainflow Fatigue Cycle Counting

Endo & Matsuishi (1968) developed the Rainflow Counting method by relating stress reversal cycles to streams of rainwater flowing down a Pagoda.  This method is very useful for fatigue analysis. The rainflow method allows the application of Miner’s rule in order to assess the fatigue life of a structure subject to complex loading. The resulting […]

## Fatigue Survey

I recently sent out a survey asking engineers which fatigue methods that they use. If anyone else would like to reply, then please send me an Email. I will then update the survey. Survey Results * * * See also: Rainflow Fatigue Dirlik Method * * * Tom Irvine Email: tom@irvinemail.org

## Webinar 37 – Acoustic Fatigue

PowerPoint Slides: webinar_37_acoustic_fatigue.pptx Audio/Visual File: AcousticFatigue.wmv * * * References: Rainflow Fatigue Posts Acoustic Fatigue of a Plate Acoustic Power Spectra * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata Webinars Thank you, Tom Irvine

## 85th Shock & Vibration Symposium, October 26-29, 2014

I will present two tutorials sessions at the Shock & Vibration Symposium. Here are the slides: Shock Response Spectra & Time History Synthesis SAVE_conference_2014_Irvine_shock.pptx Rainflow Cycle Counting for Random Vibration Fatigue Analysis SAVE_conference_2014_Irvine_fatigue_revA.pptx * * * Here is the Matlab GUI multi-function signal analysis package: vibrationdata.zip The main script is: vibrationdata.m The remaining scripts are supporting […]

## Webinar 36 – Non-Gaussian Random Fatigue and Peak Response

PowerPoint Slides: webinar_36_fatigue_nonGaussian_random.pptx Audio/Visual File non-gaussian_random_fatigue_and_peak_response.wmv YouTube Version * * * References: Rainflow Fatigue Posts Generating Random Time Histories with User-specified Skewness & Kurtosis * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata Webinars Thank you, Tom Irvine

## Webinar 35 Using Fatigue to Compare Sine and Random Environments

PowerPoint Slides: webinar_35_fatigue_sine_random.pptx Audio/Visual File: Using_Fatigue_to_Compare_Sine_and_Random_Environments.wmv YouTube version * * * References: Steinberg’s Vibration Analysis for Electronic Equipment Rainflow Fatigue Posts * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata Webinars Thank you, Tom Irvine