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首页> 外文期刊>International journal of non-linear mechanics >Dynamics characteristics of a rotor-casing system subjected to axial load and radial rub
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Dynamics characteristics of a rotor-casing system subjected to axial load and radial rub

机译:转子壳体系统在轴向载荷和径向摩擦力作用下的动力学特性

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摘要

Aiming at the coupling fault of axial load and radial rub, a geometric nonlinear rotor-casing system is developed in this paper. For the actual case that the aero-engine components (i.e. compressor disc, turbine disc, stator casing, combustor and so on) are sprayed with thermal barrier coatings, the interaction between disc and casing is refined into four stages, including no rub, low rub, rub and high rub. With the increase of invasion depth, the corresponding force models are applied to describe the different impact mechanism. The frictional characteristic between disc and casing is described by the Coulomb model. Then the linear interpolation is used to predict the instantaneous contact of disc-casing and the nonlinear dynamic behaviours of the rotor-casing system subjected to axial load and radial rub are analysed in the form of bifurcation diagram. Moreover, the rub-impact forms, such as full annular rubbing and partial rubbing, are identified by whirl orbit and waveform. On this basis, the dynamic comparison of the rotor system with/without axial load is conducted. The response variations caused by coating hardness and support stiffness of casing are further discussed. (C) 2017 Elsevier Ltd. All rights reserved.
机译:针对轴向载荷与径向摩擦的耦合故障,提出了一种几何非线性转子-机壳系统。对于实际情况,在航空发动机部件(例如压缩机盘,涡轮盘,定子壳体,燃烧室等)上喷涂热障涂层,将盘与壳体之间的相互作用细化为四个阶段,包括无摩擦,低擦,擦和高擦。随着侵入深度的增加,采用相应的力模型来描述不同的冲击机理。圆盘与套管之间的摩擦特性由库仑模型描述。然后采用线性插值法预测盘壳的瞬时接触,并以分叉图的形式分析了转子壳系统在轴向载荷和径向摩擦作用下的非线性动力学行为。此外,通过旋转轨道和波形来识别摩擦冲击形式,例如完全环形摩擦和部分摩擦。在此基础上,进行了带/不带轴向载荷的转子系统的动态比较。进一步讨论了由涂层硬度和套管支撑刚度引起的响应变化。 (C)2017 Elsevier Ltd.保留所有权利。

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