An Analytical Solution for Predicting the Vibration-Fatigue-Life in Bimodal Random Processes

An Analytical Solution for Predicting the Vibration-Fatigue-Life in Bimodal Random Processes

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Predicting the vibration-fatigue-life of engineering structures subjected to rubbermaid 8 gallon trash can random loading is a critical issue for.Frequency methods are generally adopted to deal with this problem.This paper focuses on bimodal spectra methods, including Jiao-Moan method, Fu-Cebon method, and Modified Fu-Cebon method.It has been proven that these three methods can give acceptable fatigue damage results.However, these three bimodal methods do not have analytical solutions.

Jiao-Moan method uses an approximate solution, Fu-Cebon method, and Modified Fu-Cebon method needed to be calculated by numerical integration which is obviously not convenient in engineering application.Thus, an analytical solution for predicting the vibration-fatigue-life in bimodal spectra is developed.The accuracy of the analytical solution is compared with numerical integration.The results show that a very good agreement between an analytical solution and numerical integration can be obtained.Finally, case study in offshore structures is conducted and a bandwidth depileve easy clean correction factor is computed through using the proposed analytical solution.