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Dinamično sklapljanje podstruktur v frekvenčnem prostoru
Drozg, Armin (Author), Boltežar, Miha (Mentor) More about this mentor... This link opens in a new window, Čepon, Gregor (Co-mentor)

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Abstract
Doktorska naloga zajema razvoj hibridnega povezovanja različnih modelov za namen preučevanja dinamike podstruktur. Doseganje optimalne učinkovitosti pri obravnavi kompleksnih izdelkov se doseže z dekompozicijo celote na manjše enote, ločeno obravnavo in ob upoštevanju robnih in začetnih pogojev povezovanje ugotovitev nazaj v skupni odziv. Uporabnost tovrstnega pristopa je pogojena z zmožnostjo pridobitve realnih dinamskih lastnosti sistema za vseh šest prostostnih stopenj, definiciji kontaktnih razmer ter upoštevanju skladnosti dinamskih ostankov med posameznimi modeli. V delu je predlagana implementacija direktnega rotacijskega zaznavala pospeškov in s tem prilagoditev osnovne formulacije temelječe na translacijskih odzivih na celoten odzivni model. Doprinos razširjenega modela omogoča fizikalno konsistenten popis kontaktov in s tem razširitev iz trenutnih togih točkovnih na prožne linijske kontakte brez kakršnih koli strukturnih modifikacij. Osrednji doprinos v pričujočem delu pa se nanaša na razvoj sedem stopenjskega hibridnega postopka, v katerem je izvedena integracija različnih modelov v izboljšan postopek napovedovanja dinamskih odzivov sklopljenih sistemov. Predlagana metodologija zajema sinhronizacijo eksperimentalnih in numeričnih prostostnih stopenj z ohranjanjem realnih dinamskih lastnosti iz izmerkov ter iterativnem usklajevanju dinamskih ostankov. Implementacija razvitega hibridnega postopka na primer realnega testnega sistema nakazuje na potencial izboljšanja trenutnih omejitev dinamike podstruktur.

Language:Slovenian
Keywords:strukturna dinamika, dinamika podstruktur, rotacijske prostostne stopnje, prožna dinamika kontaktov, dinamski ostanki, hibridna metoda sklapljanja, razširjanje modela
Work type:Doctoral dissertation (mb31)
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Views:181
Downloads:146
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Secondary language

Language:English
Title:Dynamic substructuring in the frequency domain
Abstract:
The doctoral thesis covers the development of hybrid integration of different models for the purpose of dynamic substructuring. When dealing with large-scale products, optimal efficiency can be achieved by decomposing the whole structure to smaller substructures, applying separate analysis and later based on boundary conditions couple partial results back together. The applicability of this approach is conditioned by the ability to obtain real dynamic properties of the system for all six degrees of freedom, the definition of joints characteristics and the compliance of dynamic residues between individual models. In this thesis the implementation of the direct rotational accelerometer and in this way the expansion of the basic formulation based on translational responses to the overall response model. Additionally included rotational degrees of freedom define a physically consistent behavior of contacts, and thus extensions from current rigid point connections to flexible line contacts without any structural modifications. The main contribution relates to the development of a hybrid process in which the integration of different models improves the ability to predict dynamic responses of coupled systems. The proposed methodology introduces the combination of experimental and numerical degrees of freedom by maintaining measured dynamic properties from the experiment and expansion to the rest of unmeasured degrees od freedom. Proposed hybrid process is demonstrated in a real case study, where obtained results present improvements compared to typical dynamics substructuring methods.

Keywords:structural dynamic, dynamic substructuring, rotational degrees of freedom, local joint flexibility, dynamic residuals, hybrid coupling method, model expansion

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