Performance degradation research of mistuning combined rotor considering rod relaxation

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (20) : 21-26.

SU Yong-lei1,2，WANG Ai-lun1,2,ZENG Hainan3

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Abstract

Combined rotor is the key part of engine, it is important to reveal degradation mechanism and assess the performance degradation degree for making maintenance during operation. Performance degradation characteristics of combined rotor were discussed, from the perspective of performance degradation caused by structural damage. Firstly, dynamic features of combined rotor was analyzed which considering rod relaxation and interface contact effect, the relations that natural frequency change with time was obtained. Then, by defining degradation degree of combined rotor, degradation path was described through dealing with degradation data, degradation assessment was completed as well. In the end, unbalance response of combined rotor was conducted based on same mistuning degree of preload; degradation characteristics of combined rotor were obtained. The results show that: degradation parameters of combined rotor have exponential distributions, and negative mistuning has great effect on unbalance response amplitude of combined rotor.

Key words

rod relaxation / combined rotor / degradation degree / mistuning / natural frequency

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SU Yong-lei1,2，WANG Ai-lun1,2，ZENG Hainan3 . Performance degradation research of mistuning combined rotor considering rod relaxation[J]. Journal of Vibration and Shock, 2015, 34(20): 21-26

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