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CSME 2021/06
Volume 42 No.3
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263-273
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Nonlinear and Linear Phenomenon Investigation of Coupled Vibration of a Multi-Disc Rotor Based on Multi-Mistuned Blade Length or Multi-Disordered Straggle Angle Blades
Yi-Jui Chiua, Ya-Zheng Zhaoa, Xiao-Yun Lia, Chia-Hao Yangb, Guo-Fei Yua and Cheng-Wei Yea
aSchool of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen, 361024, Fujian Province, China.
bDepartment of Mechanical Engineering, Taipei Chengshih University of Science and Technology, Taipei, Taiwan
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Abstract:
This study used the finite element method (FEM) and assumed mode method (AMM) to refine the disk-transverse, blade-bending, and shaft-torsion coupling vibration phenomenon of a multi-disc system with multi-mistuned or multi-disordered blades. The authors explore and compare the change regulations of the natural frequencies and mode shapes in the rotor system. Numerical calculation results show that the number of mistuned or disorder blades, as well as their symmetry, will affect the natural frequencies. In a quantitative case, the authors set blade (1) at 10% mistune, and blade (2) has mistune from -10% to +10%. The frequencies of 1a11 and 1b12 to 1b15 modes are unchanged in the length error of blade (2) variation. The frequencies of 1b11 (SDB) modes decrease from 100.63 Hz to 67.50 Hz, with a blade (2) length error increasing from -10% to 10%. The rotation effect is also explored, and it is found that the mistuned effect becomes complex and unstable.
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Keywords: Multi-disk, Assumed mode method, FEM, Coupled vibration, Mistuned and disorder.
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©
2021
CSME , ISSN 0257-9731
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