Modeling and Dynamic Analysis for the Foundation of a Blade-Rotor System  

作　　者：Liang Anyang Huang Guoyuan Zhang Yuetong Yue Lin 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics [2]School of Engineering and Informatics,University of Sussex

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2017年第3期326-332,共7页南京航空航天大学学报（英文版）

基　　金：supported by the National Key Research and Development Plan(No.2016YFF0203300)

摘　　要：In order to achieve the model-based fault monitoring and diagnosis,an accurate model for the rotor system is necessary to locate and quantify faults.Since the dynamic characteristics of a blade-rotor system is influenced by foundation flexibility,the modeling and dynamic analyses on the foundation were sequentially investigated.Firstly,the effect of element size on the model convergence was investigated using the forward difference quotient as the slope of the frequency difference,which found that the model converged when the element size refined to 4mm.Secondly,a modal analysis and a harmonic response analysis were performed to obtain the dynamic characteristics of the foundation structure.Finally,an optimization to the foundation utilizing an additional stiffener was conducted to reduce the foundation response and make the critical speed far away from the working frequency band of 20—50Hz.In order to achieve the model-based fault monitoring and diagnosis,an accurate model for the rotor system is necessary to locate and quantify faults.Since the dynamic characteristics of a blade-rotor system is influenced by foundation flexibility,the modeling and dynamic analyses on the foundation were sequentially investigated.Firstly,the effect of element size on the model convergence was investigated using the forward difference quotient as the slope of the frequency difference,which found that the model converged when the element size refined to 4mm.Secondly,a modal analysis and a harmonic response analysis were performed to obtain the dynamic characteristics of the foundation structure.Finally,an optimization to the foundation utilizing an additional stiffener was conducted to reduce the foundation response and make the critical speed far away from the working frequency band of 20—50Hz.

关 键 词：rotor refined sequentially utilizing blade quantify quotient harmonic convergent locate 

分 类 号：TH113[机械工程—机械设计及理论] O327[理学—一般力学与力学基础]