Abstract
A new mobile interface prestressed component mode synthesis (CMS) super-element method is proposed with the mobile interface prestressed and free interface super-element approach. Analysis accuracy of this method is verified by the cyclic symmetry analysis method and the direct method. The mistuning parameter of real blades is identified by modal testing and finite element method, and the vibration characteristics of the real mistuned bladed disk system are analyzed based on the mobile interface CMS method. The results showed that the maximum relative error of the dynamic frequency of tuned and mistuned examples are 0.0043 % and 0.1466 %, respectively, which can be to meet the requirement of analytical precision. Compared with the cyclic symmetry analysis method, direct method and fixed interface prestressed CMS super-element method, this method is more suitable for analyzing the vibration characteristics of arbitrary mistuned bladed disk system.
Highlights
Bladed disk system, as an important component of the aero-engine, its vibration characteristics directly affect the aero-engine's operational reliability and structural integrity
Regardless of tuned system or mistuned system, the mobile interface prestress component mode synthesis (CMS) super-element method meets the requirements of analytical accuracy in terms of dynamic frequency and vibration mode
This paper proposes a mobile interface prestressed CMS super-element method in view of the shortcomings while analyzing the complex large-scale model such as mistuned bladed disk system by using the existing CMS super-element method
Summary
As an important component of the aero-engine, its vibration characteristics directly affect the aero-engine's operational reliability and structural integrity. The vibration characteristics and response analysis of the mistuned bladed disk system is a prestressed mode synthesis analysis of the sub-structure, which is often used for the analysis of first overall- substructure. This analysis method only applies to small and medium model, it is very time-consuming while analyzing the mistuned bladed disk system and other large models. Based on the above shortcomings, a new method of mobile interface prestressed CMS super-element is proposed, which uses the analysis of elementary substructure- overall Analysis accuracy of this method is verified by the cyclic symmetry analysis method and the direct method. The vibration characteristics of a real mistuned bladed disk structure are analyzed by this method
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