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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (6): 224065-224065.doi: 10.7527/S1000-6893.2020.24065

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Evaluation of vibration coupling effect of dual-rotor system with intershaft bearing

WANG Jie1, ZUO Yanfei1, JIANG Zhinong2, FENG Kun3   

  1. 1. Key Lab of Engine Health Monitoring-Control and Networking of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Beijing Key Laboratory of High-end Mechanical Equipment Health Monitoring and Self-Recovery, Beijing University of Chemical Technology, Beijing 100029, China;
    3. China Aero Engine Vibration Health Monitoring-Control Joint Lab, AVIC Shenyang Engine Design Institute-Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2020-04-06 Revised:2020-05-03 Online:2021-06-15 Published:1900-01-01
  • Supported by:
    National Natural Science Foundation of China (51905025)

Abstract: To evaluate the vibration coupling effect of the intershaft bearing on the dual-rotor system, this paper illustrates the expressions and relations of the coupling vibration of the two rotors and proposes the corresponding evaluation indexes or methods, from the perspectives of the mode shape change at the critical speed, the critical speed change, the change of the strain energy distribution between the mode shape and the steady-state unbalanced response, and the change of the bearing force of the intermediate shaft. The typical dual-rotor system of gas turbine engines is analyzed and evaluated. The results show that the mode shapes of single rotors may appear in three forms in the dual-rotor mode shapes:one-to-one corresponding, repeated, or coupled. The corresponding critical speed and strain energy distribution will also change accordingly. The peak value of the intermediate shaft bearing force appears at the critical speed position, while the speed position with the largest change of strain energy distribution is not consistent with the critical speed position of the system, and is affected by the unbalanced excitation position. The curve of the strain energy ratio of each element with the change of rotating speed can analyze the change of strain energy distribution of the system under the specific unbalanced excitation. The method can be used as a reference for the design and fault diagnosis of the dual-rotor intershaft bearing system.

Key words: dual-rotor, intershaft bearing, coupling effect, mode assurance criteria, strain energy ratio change

CLC Number: