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利用金属基或陶瓷基硬涂层可以改变压气机叶片的固有特性,进而可以在某种程度上改善叶片的抗振动疲劳能力。针对具有压电和压磁效应的金属基和陶瓷基两类典型材料的硬涂层,采用有限元法对涂层-叶片复合材料结构进行模态分析,对比涂层厚度和涂覆位置等对叶片固有特性的影响。在涂层-叶片复合材料结构有限元建模中,涂层视为各向异性材料并考虑其电磁效应,叶片基体为各向同性材料。结果表明,两类硬涂层的厚度和涂覆位置都对叶片固有特性有明显影响,对弯曲振型影响较小,对扭转振型和高阶复合振型的影响较大。
The use of metal-based or ceramic-based hard coatings can change the inherent characteristics of the compressor blades and, to a certain extent, improve the resistance to vibration of the blades. Aiming at the hard coating of two typical types of metal-based and ceramic-based hard coatings with piezoelectric and piezomagnetic effects, the finite element method was used to analyze the structure of the coating-blade composite and compare the coating thickness and coating position Effect of blade inherent characteristics. In the finite element modeling of the coating-blade composite structure, the coating is considered as an anisotropic material and the electromagnetic effect is taken into account. The substrate of the blade is isotropic material. The results show that both the thickness and the coating position of the two types of hard coatings have obvious influence on the inherent characteristics of the blade, but have little effect on the flexural modes and have a great influence on the torsional modes and the complex modes.