Research Article

Flexible rotor optimization design with considering the uncertainty of unbalance distribution

¹ School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
² Collaborative Inovation Center of Advanced Aero-Engine, Beijing 100191, China
³ Aviation Key Laboratory of Aeroengine Vibration Technology, AVIC Aviation Powerplant Research Institute, Zhuzhou 412000, China

^* e-mail: jia_sx@163.com

Received: 15 May 2020
Accepted: 15 June 2020

Abstract

A flexible rotor optimization design considering the uncertainty of the unbalance is carried out in this paper. Assuming that the magnitude and phase of unbalance obey normal distribution and uniform distribution respectively, the uncertainty can be quantitatively described. The classical 6 Sigma method is used to perform uncertain optimization design of the rotor system considering this uncertainty. The theoretical results are verified by experiments in which 36 sets of unbalance are artificially distributed to the rotor to simulate the uncertainty. In experiment, the amplitude response of the two disks and the acceleration response of the two bearings are decreased by 14%, 21.5%, 37.2% and 46% respectively in terms of standard deviation. It can be concluded that the optimization design considering the uncertainty can reduce the fluctuation of the response and improving the robustness of the results.