Modal Testing and Finite Element Analysis of Crack Effects on Turbine Blades

Journal of Solid Mechanics

مقاله 12، دوره 8، شماره 3، آذر 2016، صفحه 614-624   

نوع مقاله: Research Paper

نویسندگان

K.R.P Babu^{* 1}؛ B.R Kumar²؛ K.M Rao³

¹Research Scholar, Department of Mechanical Engineering, JNTUK Kakinada, India---- Department of Mechanical Engineering, KLEF University, Guntur, India

²Department of Mechanical Engineering, KLEF University, Guntur, India

³Department of Mechanical Engineering, JNTUK Kakinada, India

چکیده

The study of vibration response of a turbine blade helps to detect the crack presence in the blade which alters its dynamic characteristics. The change is characterized by changes in the modal parameters associated with natural frequencies. In this paper, study of vibration response is made for turbine blade in the presence of a crack like defect. Turbine blade is initially assumed as a cantilever beam. Modal testing has been carried out for both the beams with different crack depth and crack location ratios using FFT spectrum analyzer and ANSYS software. From the analysis, it has been observed that the crack depth and its location have noticeable effect on the natural frequencies. Later the same cantilever beam was twisted with different angle of twists to validate the cantilever beam model to turbine blade.

کلیدواژه‌ها

Vibration response؛ Finite Element Analysis؛ Twisted cantilever beam؛ Turbine blade؛ FFT analyzer

مراجع

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