Free vibration analysis of a pre-twisted sandwich blade with thermal barrier coatings layers

• Published in: Science China. Technological sciences 2017-11, Vol.60 (11), p.1747-1761
• Main Authors: Cao, DongXing, Liu, BingYi, Yao, MingHui, Zhang, Wei
• Format: Article
• Language: English
• Subjects: Ambient temperature; Cantilever plates; Chebyshev approximation; Engineering; Finite element method; Free vibration; Plate theory; Ritz method; Shear deformation; Thermal barrier coatings; Thickness; Vibration analysis; 一阶剪切变形理论; 切比雪夫; 夹层; 旋转叶片; 涡轮叶片; 热障涂层; 自由振动分析; 预扭
• ISSN: 1674-7321; 1869-1900
• DOI: 10.1007/s11431-016-9011-5

A rotating cantilever sandwich-plate model with a pre-twisted and pre-set angle has been developed to investigate the vibrational behavior of an aero-engine turbine blade with thermal barrier coating （TBC） layers. The classic von Karman plate theory and the first-order shear deformation theory are applied to derive the energy equations of the rotating TBC blade, in which the geometric shapes, the work ambient temperature, and the TBC material properties are considered. The Chebyshev-Ritz method is used to obtain the nature frequency of the rotating TBC blade. For static frequency and modal analysis, the finite-element method （FEM） is also applied to compare and validate the results from the Chebyshev-Ritz method. A good agreement is found among these kinds of methods. For dynamic frequency, the results are analyzed in detail concerning the influence of system parameters such as the thickness of the TBC layer, the working temperature, and the pre-twisted and pre-set angle. Finally, the Campbell diagram is demonstrated to analyze the resonance property of the cantilever sandwich TBC blade model.