Computational Studies of the Unbalance Response of a Whole Aero-Engine Model With Squeeze-Film Bearings

Author:

Bonello Philip1,Hai Pham Minh1

Affiliation:

1. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, M60 1QD, UK

Abstract

The computation of the unbalance vibration response of aero-engine assemblies fitted with nonlinear bearings requires the retention of a very large number of modes for reliable results. This renders most previously proposed nonlinear solvers unsuitable for this application. This paper presents three methods for the efficient solution of the problem. The first method is the recently developed impulsive receptance method (IRM). The second method is a reformulation of the Newmark-beta method. In addition to these two time-domain methods, a whole-engine receptance harmonic balance method (RHBM) is introduced that allows, for the first time, the frequency domain calculation of the periodic vibration response of a real engine. All three methods use modal data calculated from a one-off analysis of the linear part of the engine at zero speed. Simulations on a realistically-sized representative twin-spool engine model with squeeze-film damper bearings provide evidence that the popular Newmark-beta method can be unreliable for large-order nonlinear systems. The excellent correlation between the IRM and RHBM results demonstrates the efficacy of these two complementary tools in the computational analysis of realistic whole-engine models.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference11 articles.

1. An Impulsive Receptance Technique for the Time Domain Computation of the Vibration of a Whole Aero-Engine Model With Nonlinear Bearings;Hai;J. Sound Vib.

2. Non-Linear Modelling of Rotor Dynamic Systems With Squeeze Film Dampers—An Efficient Integrated Approach;Bonello;J. Sound Vib.

3. Analysis of a Flexible Rotor System Including Non-Linear Squeeze Film Damping Using a Finite Element Method;Lim

4. Efficient Computation on the Nonlinear Responses of a Rotating Assembly Incorporating the Squeeze-Film Damper;Chu;Comput. Methods Appl. Mech. Eng.

5. Transient Modal Analysis of Nonlinear Rotor-Bearing Systems;Armentrout;Proc. SPIE

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