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On the influence of boundary conditions on the modal properties of a base frame
Author(s) -
Renning Maik,
Kracht Kerstin,
von Wagner Utz,
Köster Philipp,
Bozkurt Taner
Publication year - 2014
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201410133
Subject(s) - base (topology) , modal , modal analysis , frame (networking) , structural engineering , turbomachinery , finite element method , stiffness , rotor (electric) , range (aeronautics) , natural frequency , modal testing , boundary value problem , computer science , boundary (topology) , acoustics , engineering , mechanical engineering , mathematics , mathematical analysis , physics , vibration , materials science , aerospace engineering , polymer chemistry
Supports of turbomachineries can be designed as base frames, which are constructions of steel‐plates. One of the most important design requirements of the turbomachinery system is to avoid of natural frequencies in the operating speed range. Thus, a rotor dynamics analysis (see e.g. [1]), which is usually carried out using transfer matrix methods or finite element methods has to take the dynamic stiffness of the base frame into account. However, there are several problems to identify this complex and frequency dependent parameter, for example the localization of excitation or measurement responses and the difficulty of the support of base frames, e.g jack screws. In this article the support of a test base frames is analyzed by modal analysis experimentally. (© 2014 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)