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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (10): 524670-524670.doi: 10.7527/S1000-6893.2020.24670

• Article • Previous Articles     Next Articles

Precision control of rotor assembly based on improved Jacobian-Torsor theory

DING Siyi, ZHENG Xiaohu   

  1. School of Mechanical Engineering, Donghua University, Shanghai 201620, China
  • Received:2020-08-26 Revised:2020-10-09 Published:2020-11-27
  • Supported by:
    National Natural Science Foundation of China (51805079); Fundamental Research Funds for the Central Universities (19D110322); Open Project of Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment, Zhengzhou University of Light Industry (IM201905)

Abstract: Rotor assembly is a core process in aero-engine manufacturing. In rotor assembly, preventing out-of-tolerance of concentricity is the primary problem needed to be solved. Traditional methods for the problem are based on manual test with the dial indicator, which depends on experience appraises and lacks a systematic and quantitative structural precision design theory. In this paper, revolving characteristics and multistage assembly characteristics of rotors are discussed. A three dimensional deviation modeling method based on the improved Jacobian-Torsor theory and a concentricity control strategy are proposed. A revolution joint is introduced to represent the revolving characteristics of aero-engine rotors. Then the extended Jacobian matrix is derived and thus a correction of the original J-T model is completed. The concentricity variation propagation function of multistage rotor stacking is further determined, and the control equation for concentricity is derived. Based on the model, a four-stage rotor assembly is verified. The best concentricity is 0.042 mm when the optimal installation angles are 3.513 rad, 5.206 rad, and 0.953 rad. The results show that the model can effectively predict the overall precision and determine the optimal assembly plan, and has strong significance in engineering practice.

Key words: aero-engine, rotors assembly, improved Jacobian-Torsor theory, three dimensional deviation analysis, precision control

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