Random Loads Fatigue and Dynamic Simulation: a New Procedure to Evaluate the Behaviour of Non-Linear Systems

In this paper the problem of the correct evaluation of the stress state of mechanical components of non linear systems in the frequency domain was analysed. This is one of the most important steps in the frequency domain evaluation of the fatigue behaviour of components submitted to random loads. A...

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Bibliographic Details
Published in:Structural durability & health monitoring 2011-01, Vol.7 (1&2), p.83-116
Main Authors: Braccesi, C, Cianetti, F
Format: Article
Language:English
Subjects:
Computer simulation
Damage assessment
Density
Dynamical systems
Environment models
Fatigue (materials)
Frequency analysis
Frequency domain analysis
Frequency domains
Frequency response functions
Linear systems
Mechanical components
Methodology
Multibody systems
Nonlinear dynamics
Nonlinear systems
Power spectral density
Random loads
Stress state
Stresses
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Summary:In this paper the problem of the correct evaluation of the stress state of mechanical components of non linear systems in the frequency domain was analysed. This is one of the most important steps in the frequency domain evaluation of the fatigue behaviour of components submitted to random loads. A new methodology to obtain an accurate representation in frequency domain of the non-linear behaviour of the system as well as of the stress state of the components both in terms of power spectral density (PSD) function and of frequency response function (FRF) was proposed and validated. This methodology is useful in multibody simulation and modelling environment (MBS) and fits well into a damage evaluation scenario that also involves the non Gaussianity of the process.
ISSN:1930-2983
1930-2991
DOI:10.3970/sdhm.2011.007.083