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首页> 外文会议>ASME Turbo Expo 2006: Power for Land, Sea, and Air vol.5 pt.B: Structures and Dynamics: Mechanics and Vibration; Unsteady Aerodynamics; Rotor Dynamics and Magnetic Bearings >ANALYSIS OF VARIATION OF NATURAL FREQUENCY AND RESONANT STRESS OF BLADE
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ANALYSIS OF VARIATION OF NATURAL FREQUENCY AND RESONANT STRESS OF BLADE

机译：叶片固有频率和共振应力的变化分析

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摘要

A compressor blade of low aspect ratio is a typical shell-type structure and its natural frequency and vibratory stress are sensitive to a manufacturing tolerance, in designing a blade, the designer should take the variation of the vibration characteristics into account, and evaluate the mechanical strength of the blade. This paper, first, proposes an analysis method for predicting the resonant stress due to the interaction force between the vane and blade, using 3-D CFD and the modal analysis method based on 3-D FEM. Rig tests of the compressor are carried out, and the measured frequencies and vibratory stresses are compared to predicted values, and the validity of the proposed method is verified. In the second place, a practical analysis method for predicting the variation of the natural frequency and vibratory stress of the blade is proposed, where the variation of the vibration characteristics such as a natural frequency and a resonant stress is evaluated by the first order second moment method in addition to 3-D CFD and 3-D FEM. The calculated results are compared with measured ones. From the results, it is confirmed that the variation of the vibration characteristics can be predicted by the simple method proposed in this paper.
机译：低纵横比的压缩机叶片是典型的壳型结构，其固有频率和振动应力对制造公差敏感，因此在设计叶片时，设计人员应考虑振动特性的变化，并评估其机械性能。叶片的强度。本文首先提出了一种利用3-D CFD和基于3-D FEM的模态分析方法来预测叶片与叶片之间相互作用力引起的共振应力的分析方法。对压缩机进行了吊装试验，并将测得的频率和振动应力与预测值进行了比较，验证了该方法的有效性。其次，提出了一种预测叶片固有频率和振动应力变化的实用分析方法，通过一阶二阶矩来评估固有频率和共振应力等振动特性的变化。除3-D CFD和3-D FEM之外的方法。将计算结果与测量结果进行比较。从结果可以确认，可以通过本文提出的简单方法来预测振动特性的变化。

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