Calculation of Natural Frequencies on Transverse Vibration for drill strings in Non-Uniform Temperature Field

It is necessary to consider the effect of temperature which changes the mechanical properties of materials when drill strings work in a non-uniform temperature field. In this paper, the natural frequencies of transverse vibration are studied under axial compression in the nonuniform temperature fiel...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-07, Vol.563 (5), p.52049
Main Authors: Jianqing, Ma, Junqiang, Li, Guangwei, Zhang
Format: Article
Language:English
Subjects:
Approximation
Asymptotic methods
Axial compression
Drillstrings
Material properties
Mechanical properties
Resonant frequencies
Temperature
Temperature distribution
Temperature effects
Transverse oscillation
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Summary:It is necessary to consider the effect of temperature which changes the mechanical properties of materials when drill strings work in a non-uniform temperature field. In this paper, the natural frequencies of transverse vibration are studied under axial compression in the nonuniform temperature field. Using an asymptotic solution method, first-order approximation formula of the nonlinear vibration equation is obtained. The effects of temperature changes and axial pressure on the natural frequencies are discussed by an example. The results show that the influence of temperature on the critical load is small; change rate of natural frequency increases with the increase of axial pressure; while the axial pressures become larger, the influence of temperature on the first-order frequency is greater than on the second-order's.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/563/5/052049