Frequency optimization based on “exact” sensitivity and fatigue life estimation

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Frequency optimization based on “exact” sensitivity and fatigue life estimation

Tomasz Bednarek, Włodzimierz Sosnowski

Institute of Fundamental Technological Research, PAS, Warsaw Kazimierz Wielki University, Bydgoszcz

DOI:

https://doi.org/10.7494/cmms.2007.2.0150

Abstract:

In this paper the optimization of double – disk rotor shaft system based on sensitivity analysis followed by the fatigue life estimation of optimized shaft is considered. The objective of optimization is to avoid resonance, which can cause excessive stresses leading to prematural fatigue cracks. Sensitivities of eigenvalues with respect to design variables are calculated by the Direct Differentiation Method (DDM) (Kleiber et al., 1997 Sergeyev & Mroz, 2000). The optimization is performed with the objective to move natural frequencies as far as possible from resonance frequency. Next the shaft system is dynamically loaded. Fluctuation of stress is stored, cycles are counted by rainflow method and next fatigue life estimation is performed. Diameters of selected shaft parts are chosen as design parameters.

Cite as:

Bednarek, T., & Sosnowski, W. (2007). Frequency optimization based on “exact” sensitivity and fatigue life estimation. Computer Methods in Materials Science, 7(2), 243 – 249. https://doi.org/10.7494/cmms.2007.2.0150

Article (PDF):

Keywords:

Insitivity analysis, Rainflow method, Metal fatigue

References: