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

Abstract EN

Predicting the vibration-fatigue-life of engineering structures subjected to 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 correction factor is computed through using the proposed analytical solution.