The effects of typical machining errors on the dynamic features of rod-fastened rotor bearing system (RBS) are studied in this paper. Three micron-sized machining errors are considered in a three-dimensional (3D) rod-fastened model. The static effects of machining errors are investigated by applying finite element method. Results demonstrate that machining errors not only bring about mass eccentricity but also cause obvious rotor bending due to large pretightening force. Then, nonlinear dynamic features such as stability and bifurcation are analyzed by using target-shooting technique, track-following method, and Floquet theory. Analysis data indicate that rotor bending originated from machining errors reduces the system stability evidently. It is also observed that the vibration value continues to go up after critical speed as rotating speed increases. It is a particular property compared with integral rotor. It explains the reason why the machining precision of rod-fastened rotor is much higher than that of the corresponding integral rotor to some extent. Moreover, differences between machining errors are compared and the results show that the machining precision of axial assembly interfaces should be paid more attention in the rod-fastened rotor design.
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February 2017
Research-Article
Effects of Typical Machining Errors on the Nonlinear Dynamic Characteristics of Rod-Fastened Rotor Bearing System
Yi Liu,
Yi Liu
Key Laboratory of Education Ministry for Modern
Design and Rotor-Bearing System;
Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: sfzw0016@163.com
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: sfzw0016@163.com
Search for other works by this author on:
Heng Liu,
Heng Liu
Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System;
Modern Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: hengliu@mail.xjtu.edu.cn
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: hengliu@mail.xjtu.edu.cn
Search for other works by this author on:
Nanshan Wang
Nanshan Wang
Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System;
Modern Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: tyus2012@163.com
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: tyus2012@163.com
Search for other works by this author on:
Yi Liu
Key Laboratory of Education Ministry for Modern
Design and Rotor-Bearing System;
Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: sfzw0016@163.com
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: sfzw0016@163.com
Heng Liu
Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System;
Modern Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: hengliu@mail.xjtu.edu.cn
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: hengliu@mail.xjtu.edu.cn
Nanshan Wang
Key Laboratory of Education Ministry for
Modern Design and Rotor-Bearing System;
Modern Design and Rotor-Bearing System;
State Key Lab for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: tyus2012@163.com
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
No. 28, West Xianning Road,
Xi'an, Shaanxi, China
e-mail: tyus2012@163.com
1Corresponding author.
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 28, 2015; final manuscript received August 21, 2016; published online October 25, 2016. Assoc. Editor: John Yu.
J. Vib. Acoust. Feb 2017, 139(1): 011004 (10 pages)
Published Online: October 25, 2016
Article history
Received:
October 28, 2015
Revised:
August 21, 2016
Citation
Liu, Y., Liu, H., and Wang, N. (October 25, 2016). "Effects of Typical Machining Errors on the Nonlinear Dynamic Characteristics of Rod-Fastened Rotor Bearing System." ASME. J. Vib. Acoust. February 2017; 139(1): 011004. https://doi.org/10.1115/1.4034768
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