Nonlinear dynamic analysis of whole aeroengine models with harmonic balance method and continuation techniques for imperfect bifurcations and isolated solutions.

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Title: Nonlinear dynamic analysis of whole aeroengine models with harmonic balance method and continuation techniques for imperfect bifurcations and isolated solutions.
Authors: Salles, L
Staples, B
Hoffmann, NP
Schwingshackl
Item Type: Journal Article
Abstract: The analysis of whole engine rotor-dynamic models is an important element in the design of aerojet engines. The models include gyroscopic effects and allow for rubbing contact between rotor and stator components such as bladed discs and casing. Due to the non-linearities inherent to the system, bifurcations in the frequency response may arise. Reliable and efficient methods to determine the bifurcation points and solution branches are required. For this purpose a multi-harmonic balance approach is presented that allows a numerically efficient detection of bifurcation points and the calculation of both continuous and isolated branches of the frequency response functions. The method is applied to a test-case derived from a commercial aero-engine. A bifurcation structure with continuous and isolated solution branches is observed and studied in this paper. The comparison with time-marching based on simulations shows both accuracy and numerical efficiency of the newly developed approach
Date of Acceptance: 6-Apr-2016
URI: http://hdl.handle.net/10044/1/30876
ISSN: 1573-269X
Publisher: Springer Verlag (Germany)
Journal / Book Title: Nonlinear Dynamics
Sponsor/Funder: Rolls-Royce Plc
Technology Strategy Board
Funder's Grant Number: See Further Information
110123
Keywords: Acoustics
01 Mathematical Sciences
09 Engineering
Publication Status: Accepted
Appears in Collections:Faculty of Engineering
Mechanical Engineering



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