University of Twente Student Theses


Modal analysis techniques for (damped) floors : Explained and tested

Giesen, R. (2018) Modal analysis techniques for (damped) floors : Explained and tested.

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Abstract:Modal description is a tool to describe the dynamic behaviour of a structure. Modal parameters can be found from a (simplified) theoretical spring-mass model or by measurements taken from the structure, in combination with certain fitting techniques. The modal analysis procedure for the measurement and analysis of vibrations in a damped structure can be split into two complementing parts: the theoretical and the experimental analysis. The theoretical modal analysis makes a prediction of the system based on a simplified representation of the structure, while the experimental modal analysis determines the system by means of measurements and modal parameter estimation of the unknown data. Together they provide an accurate modal description of the structure, showing the natural frequencies at which resonance occurs and the shapes of deformation during vibrations. The methods derived during this research where checked using measurement data of real-life situations. Three modal parameter estimation methods where attempted during this research. It was observed that the applicability of these methods, with regard to the accuracy, is heavily situation-dependent. The structure that is being measured and the desired results
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Programme:Mechanical Engineering MSc (60439)
Keywords:Modal analysis, Quadrature picking, Curve fitting
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