噪聲作用下加筋板的幾何非線性隨機(jī)響應(yīng)(英文)
發(fā)布時(shí)間:2021-06-17 11:10
提出了一種降階模型、等效線性化和有限元相結(jié)合的方法,對噪聲荷載作用下加筋板的幾何非線性隨機(jī)振動(dòng)進(jìn)行分析。基于大撓度有限元公式,得到加筋板的非線性運(yùn)動(dòng)方程。為了減少計(jì)算量,建立了結(jié)構(gòu)的降階模型,然后通過DMAP語言編程將等效線性化技術(shù)集成到NASTRAN有限元軟件中。針對加筋板建立了梁-板組合的有限元模型,梁單元與殼單元共用節(jié)點(diǎn),并確定梁的偏置和截面屬性。本方法可以分別獲得梁、板單元的應(yīng)力響應(yīng)均方根值,并可得到加筋板有/無加筋面各自的應(yīng)力分布。最后對比分析了分別由線性和等效線性化方法得出的統(tǒng)計(jì)動(dòng)態(tài)響應(yīng)結(jié)果。結(jié)果表明,該方法可用于分析加筋板的幾何非線性隨機(jī)響應(yīng)。幾何非線性因素在加筋板隨機(jī)振動(dòng)響應(yīng)預(yù)測中起著重要的作用,尤其是在強(qiáng)噪聲載荷下。
【文章來源】:Transactions of Nanjing University of Aeronautics and Astronautics. 2020,37(05)EICSCD
【文章頁數(shù)】:13 頁
【文章目錄】:
0 Introduction
1 Reduced Order Model of Geo-metrically Nonlinear Structures
2 ForceErrorMinimizationof Equivalent Linearization Method for Random Loading
2.1 Theoretical foundation
2.2 Iterative solution for modal equivalent lin-ear stiffness matrix
2.3 Implementation of equivalent linearization solution
3 Numerical Example
3.1 Finite element model of stiffened plate and nonlinear stiffness coefficient
3.2 Result and analysis
4 Conclusions
本文編號(hào):3235084
【文章來源】:Transactions of Nanjing University of Aeronautics and Astronautics. 2020,37(05)EICSCD
【文章頁數(shù)】:13 頁
【文章目錄】:
0 Introduction
1 Reduced Order Model of Geo-metrically Nonlinear Structures
2 ForceErrorMinimizationof Equivalent Linearization Method for Random Loading
2.1 Theoretical foundation
2.2 Iterative solution for modal equivalent lin-ear stiffness matrix
2.3 Implementation of equivalent linearization solution
3 Numerical Example
3.1 Finite element model of stiffened plate and nonlinear stiffness coefficient
3.2 Result and analysis
4 Conclusions
本文編號(hào):3235084
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