— This report outlines a theoretical solution for the estimation of rainflow range density functions using statistics computed directly from power spectral density data. The rainflow range mechanism is broken down into a set of events which can be analyzed using Markov process theory. The dependence between extremes in this instance is modelled using an approximation of the joint distribution of peaks and troughs first proposed by Kowalewski.

A theoretical solution for the estimation of “rainflow” ranges from power spectral density data

The note describes a simple method for evaluation of fatigue damage of structures in wide-band vibrations from response power spectral density data in the frequency domain. The method is applied to three sample cases and the results are compared with those of the damage calculation in the time domain.

Simple Method for Evaluation of Fatigue Damage of Structures in Wide-Band Random Vibrations

Road simulators reproduce measured service environments in laboratory based test rigs and have contributed significantly to improving the structural integrity and quality of modern vehicles. These rigs are driven by data that are derived from a specified response and the frequency response function of the test rig in an iterative process. This paper introduces an alternative iterative procedure that converges to a valid drive file in fewer iteration steps than the current algorithm.

C. J. Dodds

Papers

Vehicle Load Histories: The Duality of Vibration and Fatigue Spectra