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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.B: Fluid-Structure Interaction >A TIME-DOMAIN METHOD FOR THE VIBRATION OF MISTUNED BLADED DISK ASSEMBLIES
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A TIME-DOMAIN METHOD FOR THE VIBRATION OF MISTUNED BLADED DISK ASSEMBLIES

机译：薄叶片盘组件振动的时域方法

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摘要

A chained method to compute the single mode vibration of mistuned bladed disk assemblies is proposed. Aerodynamic coupling effects are first evaluated by computing unsteady aerodynamic coefficients for a quasiSD geometry. The code is parallelized with a decomposition domain method and validated with the 4th Aeroelastic Standard Configuration. Aerodynamic coefficients are then included in a mass-spring model of the bladed disk assembly. The chained method is applied to the last row blades of a low pressure steam turbine in which localized high levels of vibrations have been observed. The phenomenon of vibration localization found by experiments is predicted with a reasonably good accuracy. Numerical results indicate that aerodynamic coupling is predominant and highly influences mistuning sensitivity. It is also shown that the mistuned row is very sensitive to structural damping. Intentional mistuning is used as a mean to reduce the amplitude magnification on the mistuned assembly. Modifying the frequency of every two blades of the assembly has proved to efficiently reduce localization. A very similar result is obtained by locally modifying the characteristics of a few blades located in high magnification zones.
机译：提出了一种计算雾化叶片盘组件单模振动的链式方法。首先通过计算准SD几何形状的非稳态空气动力学系数来评估空气动力学耦合效应。该代码使用分解域方法并行化，并通过第四气动弹性标准配置进行了验证。然后将空气动力学系数包括在叶片盘组件的质量弹簧模型中。链式方法应用于低压蒸汽轮机的最后一行叶片，在该叶片中已观察到局部高水平的振动。通过实验发现的振动局部化现象被预测为具有相当好的精度。数值结果表明，空气动力耦合是主要因素，并极大地影响了失灵灵敏度。还显示出雾化的行对结构阻尼非常敏感。有意进行微调被用作降低被微调组件上幅度放大率的手段。事实证明，修改组件中每两个叶片的频率可以有效地减少定位。通过局部修改位于高倍率区域中的几个叶片的特性可以获得非常相似的结果。

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