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Measured and investigated nonlinear dynamics parameters on bolted flange joints of combined rotor

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Abstract

The complex micro-slip phenomenon of the contact interface will lead to the nonlinear stiffness of the connection structure, as well as the structural damping and energy dissipation. As the most important connection structure of the combination rotor, the mechanical properties of bolted flange joint interface are needed in the dynamic analysis of the combined rotor. Therefore, it is urgent to model and test the friction contact interface in the nonlinear dynamic analysis of rotor. In this paper, two sets of mechanical characteristics test system were built to test the dynamic parameters of tangential and bending directions of the bolted flange joint interface. Then, the mechanical behavior and the change regularities of dynamics parameters were studied under different external excitation, bolt distribution and tightening torque. The results show that once the bolt preload is above the rated torque, stiffness softening behavior is not significant; and then the tangential stiffness of the joint interface tends to be stable, with the variation range of 8.08∼8.96e8 N/m; the equivalent bending stiffness coefficient is about 3.38∼3.83e6 N·m/rad. With the decrease of bolt preload, the external excitation and the number of bolts have a significant effect on the stiffness reduction of the joint. Finally, the change interval of the dynamics parameters of the interface obtained by the experiment provide basis for the uncertainty dynamic analysis and optimization of the rotor.

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Abbreviations

F T :

Tangential load

T :

Tightening torque

M :

Moment

x :

Horizontal displacement

y :

Vertical displacement

z :

Axial displacement

x rel :

Relative displacement

W :

Energy dissipation

θ :

Swing displacement

m :

Mass

k t :

Tangential stiffness

k HBM :

Harmonic equivalent stiffness

c HBM :

Harmonic equivalent damping

k IF :

Connection stiffness

c IF :

Connection damping

k C :

Harmonic equivalent stiffness matrix

c C :

Harmonic equivalent damping matrix

k̅ :

Dimensionless bending stiffness coefficient

k C :

Harmonic equivalent stiffness matrix

k θ :

Bending stiffness

ξ :

Damping ratio

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51875081, 51935003); National Science and Technology Major Project of China (2017-VII-0010-0105).

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Tao Li, Dongjian Yang, Binbin Zhao, Qingchao Sun, Junzhou Huo & Wei Sun

Authors
  1. Tao Li
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  2. Dongjian Yang
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  3. Binbin Zhao
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  4. Qingchao Sun
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  5. Junzhou Huo
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  6. Wei Sun
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Corresponding author

Correspondence to Qingchao Sun.

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The authors declare that they have no competing interests.

Additional information

Tao Li received Master degree in Mechanical Engineering from Dalian University of Technology, Dalian, China, in 2016. His current research interests include mechanical dynamics and rotor dynamics.

Dongjian Yang is currently a Master student at School of Mechanical Engineering of Dalian University of Technology. His research interests include robot motion planning, visual servo.

Binbin Zhao now works at Dalian University of Technology. His current research interests include Mechanical dynamics and mechanical optimal design.

Qingchao Sun now works at Dalian University of Technology. His current research interests include fatigue damage, assembly accuracy and assembly automation.

Junzhou Huo now works at Dalian University of Technology. His current research interests include mechanical dynamics, optimal design and mechanical structure life prediction.

Wei Sun now works at Dalian University of Technology. He received Ph.D. degree in Mechanical Engineering from Dalian University of Technology, Dalian, China.

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Li, T., Yang, D., Zhao, B. et al. Measured and investigated nonlinear dynamics parameters on bolted flange joints of combined rotor. J Mech Sci Technol 35, 1841–1850 (2021). https://doi.org/10.1007/s12206-021-0404-8

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  • DOI: https://doi.org/10.1007/s12206-021-0404-8

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