Imperial College London
Alternate

DrGiulianoAllegri

Faculty of Engineering, Department of Aeronautics

Honorary Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 5086g.allegri

 
 
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Location

 

212City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Yuan:2015:10.1016/j.ymssp.2015.11.011,
author = {Yuan, J and Allegri, G and Scarpa, F and Patsias, S and Rajasekaran, R},
doi = {10.1016/j.ymssp.2015.11.011},
journal = {Mechanical Systems and Signal Processing},
pages = {241--253},
title = {A novel hybrid Neumann expansion method for stochastic analysis of mistuned bladed discs},
url = {http://dx.doi.org/10.1016/j.ymssp.2015.11.011},
volume = {72-73},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The paper presents a novel hybrid method to enhance the computational efficiency of matrix inversions during the stochastic analysis of mistuned bladed disc systems. The method is based on the use of stochastic Neumann expansion in the frequency domain, coupled with a matrix factorization in the neighbourhood of the resonant frequencies. The number of the expansion terms is used as an indicator to select the matrix inversion technique to be used, without introducing any additional computational cost. The proposed method is validated using two case studies, where the dynamics an aero-engine bladed disc is modelled first using a lumped parameter approach and then with high-fidelity finite element analysis. The frequency responses of the blades are evaluated according to different mistuning patterns via stiffness or mass perturbations under the excitation provided by the engine orders. Results from standard matrix factorization methods are used to benchmark the responses obtained from the proposed hybrid method. Unlike classic Neumann expansion methods, the new technique can effectively update the inversion of an uncertain matrix with no convergence problems during Monte Carlo simulations. The novel hybrid method is more computationally efficient than standard techniques, with no accuracy loss.
AU  - Yuan,J
AU  - Allegri,G
AU  - Scarpa,F
AU  - Patsias,S
AU  - Rajasekaran,R
DO  - 10.1016/j.ymssp.2015.11.011
EP  - 253
PY  - 2015///
SN  - 0888-3270
SP  - 241
TI  - A novel hybrid Neumann expansion method for stochastic analysis of mistuned bladed discs
T2  - Mechanical Systems and Signal Processing
UR  - http://dx.doi.org/10.1016/j.ymssp.2015.11.011
VL  - 72-73
ER  -
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