Damping in Modal and Direct Methods. Part II: Rayleigh Structural Damping Instead of the Material One

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Rubric:     Theoretical and experimental studies   
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The author checks the effect of substitution of structural material damping by the Rayleigh one. “Soil” damping stays viscous. The results for material and Raleigh damping are close to each other and far from modal results. As a result, limitations in the modal approach can be shown not only be comparison with “material damping” results obtained in the frequency domain, but also by comparison with “Raleigh damping” results obtained in the time domain.