Hibridni postopek dinamičnega sklapljanja podstruktur v frekvenčnem prostoru : doktorsko delo

slovenian

doktorska dela

2023

dissertations   dynamic substructuring   expansion methods   experimental modal analysis   frequency response functions   structural dynamics   system equivalent model mixing

Univerza v Ljubljani, Fakulteta za strojništvo
(Obvezni izvod spletne publikacije)

Credible vibroacoustic analysis is based on reliable dynamic models with high spatial resolution. Various expansion methods are used to build such dynamic models. Here, the experimental response model with realistic dynamic properties is extended to the degrees of freedom of the numerical model with higher spatial resolution, resulting in a hybrid model. In the context of the PhD thesis, the focus is on the expansion method based on mixing equivalent models in the frequency domain. The reliability of the extension depends on the consistency of the experimental response model, which is usually evaluated by comparison with numerical models that do not necessarily represent the real situation. To this end, the dissertation developed a method to evaluate the consistency of individual measurements with respect to the other measurements in the experimental response model. It is shown that removing identified inconsistent measurements significantly increases the reliability of the expansion process. In the second part of the thesis, we performed a parametric analysis to identify the most influential parameters for the consistency of the expansion process. In the third part, we focused on extending the method to combine equivalent models in a form that allows expansion of dynamic response models with noncomplementary physical quantities. The applicability of the method is demonstrated by the example of a~3D-printed structure with a complex infill geometry, where the expansion is represented by measuring the field of displacements and specific deformations. The proposed method enables the development of highly reliable dynamic response models that combine physical quantities to provide deeper insight into the dynamic properties of the analyzed structures.

15.05.2023