Vibration characteristics and structural damping of rotating compressor blades

摘要: Nowadays, the increasing demand on high efficiency energy, low fuel consumption and environment friendly leads turbomachinery to be operating under a critical rotation speed at temperature pressure. This severe operation condition will definitely increase probability of occurrence cycle fatigue. To reduce risk appearing fatigue, structural damping components has increased. Since is always positive while aerodynamic can negative some situation, nevertheless an interesting field in research. One efficient way treat material over blade surface. Traditional materials, such as rubber, are not applicable environment. Therefore, hard coating applied due its stiffness good sustainability rough environments. Numerical tools developed predict dynamic rotating varying several important designing parameters. Two types blades modeled using Hamilton’s principle: straight by plate theory pretwisted shell theory. The extended Galerkin method Chebyshev collocation for numerical simulation, modal analysis frequency response analysis. parametric performed with respect speed, stagger angle, aspect ratio, etc. Proportional used all models investigate characteristics blades. Alternatively, multilayer order layerwise theory, where validated results reveal exchanges between modes loci veering influence configurations total multilayered structure. Finally, commercial finite element software real compressor treated thickness distributions.