Abstract
This paper presents an alternative technique to the modal analysis of machine foundations. The frequency dependent soil impedance (stiffness & damping), soil-foundation-machine system modeling techniques and the system natural frequencies and mode shapes are addressed in the paper. Through comparative study of the methodologies for identifying the foundation rigid body motion modes and local member motion modes, this study proposes the use of the Dynamic Magnification Factors (DMF) to determine the acceptability of natural frequencies and mode shapes. This paper introduces an alternative technique for analyzing the excitation potential of the natural modes of vibration and presents a practical methodology by using a Dynamic Magnification Factor (DMF) curve to analyze the dynamic behavior of the foundation members within the full range of machine operating speeds. All analysis studies, techniques, criteria and methodologies presented and described in the paper are using an actual engineering project as an example.
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