SIRM 2021

Die 14. SIRM (Internationale Konferenz Schwingung in rotierenden Systemen) findet online vom 17.-19. Februar 2021 statt.

Die 14. SIRM (Internationale Konferenz Schwingung in rotierenden Systemen) findet dieses Jahr online statt. Die offizielle Webseite der Konferenz und das diesjährige Programm haben wir Ihnen hier verlinkt.

Das Paper mit IDS Beteiligung wird am Freitag Vormittag (siehe Programm Session 9) vorgestellt.

Abstract:

Determining the influence of casing vibrational behaviour on rotordynamics

M. Amer, M. Paehr, L. Panning-von Scheidt, J. Seume, J. Schmied

Casings of machinery and supporting structures have an influence on the rotordynamics behaviour of the system which is commonly considered by simplified models (e.g. one mass models), which in many cases are not sufficient. Therefore more accurate modelling approaches are required which can be considered in the design process or the rotordynamic calculation to achieve a better result of the overall vibrational behaviour. To study the effects of casing and supporting structures on rotordynamics, the casing modal parameters of an axial compressor are determined conducting an experimental modal analysis. At the same time a numerical model is elaborated. A comparison between experimental and numerical data is incorporated for a model updating strategy to tune the numerical models. By defining an interface to rotordynamic programmes the results can extend existing rotordynamic models. Finally this leads to simplified reduced order models which can be integrated in existing tools and software while keeping the calculation time of the complete system low. A single stage axial compressor configuration with adjustable inlet guide vanes and stator blades serves as an example for the experimental as well as the numerical data. The main components of the compressor casing are inlet and outlet casing as well as the stator blade carrier. The casing structure is connected to the bearings through the hub body. To study the vibrational behaviour of the casing each component as well as the assembly of all components are examined. The assembly furthermore consists of the compressor base, the bearing supporting structures, the piping systems and the connected gear box and motor. The experimental modal analysis is conducted by use of an electrodynamic shaker as well as a modal hammer. The geometry is used to create a Finite Element Model based on substructures and a subsequent model updating to assure a good correlation of the modal properties of both the substructures and the assembly. The present work shows the model update process with the help of experimentally determined modal parameters. The gained knowledge out of the combined and validated solution is used to feed conventional rotordynamic models with supplementary information.

Published by DO/LPvS