A double integral method for quantitative evaluation of influence on thin-walled casing response caused by bearing uncertainties  

作　　者：Binbin GENG Yanfei ZUO Zhinong JIANG Kun FENG Chen WANG Jie WANG 

机构地区：[1]Key Lab of Engine Health Monitoring-Conlrol and Netw orking of Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China [2]Beijing Key Laboratory of High-end Mechanical Equipment Health Monitoring and Self-Recovery,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Journal of Aeronautics》2020年第9期2372-2381,共10页中国航空学报（英文版）

基　　金：co-supported by the Young Scientists Fund of the National Natural Science Foundation of China(No.51905025);the Joint Funds of the National Natural Science Foundation of China(No.U1708257);the Fundamental Research Funds for the Central Universities(No.JD1911)。

摘　　要：Bearings in a gas turbine engine are the key connecting components transmitting force and motion between rotors and thin-walled flexible casing.The bearing stiffness and damping of squeeze film damper(SFD)nearby bearings are easily affected by many factors,such as assembly process,load condition and temperature variation,resulting in uncertainties.The uncertainties may influence the response of the measuring point on the casing.Hence,it is difficult to carry out the fault diagnosis,whole machine balancing and other related works.In this paper,a double integral quantitative evaluation method is proposed to simultaneously analyze the influence of two uncertain dynamic coefficients on the response amplitude and phase of casing measuring points.Meanwhile,the coupling influence of stiffness and damping accompanied by dramatic changes with rotational speeds are essentially discussed.As an example,a typical engine bearing-casing system with complex dynamic characteristics is analyzed.The impact of uncertain dynamic coefficients on the unbalance response is quantitatively evaluated.

关 键 词：Dynamic coefficients Gas turbine engine Measuring point response Quantitative evaluation Uncertainty analysis 

分 类 号：TK473[动力工程及工程热物理—动力机械及工程]