首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >SENSITIVITY ANALYSIS OF MULTIHARMONIC SELF-EXCITED LIMIT-CYCLE VIBRATIONS IN GAS-TURBINE ENGINE STRUCTURES WITH NONLINEAR CONTACT INTERFACES
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SENSITIVITY ANALYSIS OF MULTIHARMONIC SELF-EXCITED LIMIT-CYCLE VIBRATIONS IN GAS-TURBINE ENGINE STRUCTURES WITH NONLINEAR CONTACT INTERFACES

机译:非线性接触界面的燃气轮机发动机多谐态自激极限循环振动敏感性分析

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摘要

An efficient frequency-domain method is developed to calculate the sensitivity of multiharmonic amplitudes of the limit-cycle oscillations and their primary frequency to variation of the nonlinear contact interface parameters and aerodynamic characteristics. The method allows highly accurate and fast determination of the sensitivity coefficients together with the calculation of the limit-cycle amplitudes and frequencies using realistic large-scale finite element models of structures. The nonlinear contact interactions analysed include: friction contacts, unilateral interaction along normal direction at a contact interface, closing and opening clearances and interferences, cubic spring nonlinearity.The capabilities of the method are demonstrated on a set of test cases.
机译:提出了一种有效的频域方法来计算极限循环振荡的多谐振幅及其初级频率对非线性接触界面参数和空气动力特性变化的敏感性。该方法可以使用结构的实际大规模有限元模型,高度准确,快速地确定灵敏度系数,并可以计算极限循环幅度和频率。分析的非线性接触相互作用包括:摩擦接触,在接触界面沿法线方向的单边相互作用,闭合和断开间隙和干涉,立方弹簧非线性。该方法的功能在一组测试案例中得到了证明。

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