The stability of rotating rods during the excitation of higher-order bending oscillations under the axial vibro-impact load
DOI:
https://doi.org/10.32347/2410-2547.2025.115.150-156Keywords:
geometric nonlinearity, inertia forces, vibro-impact loads, vibro-drilling, bend formsAbstract
The paper presents the investigation results of vibro-drilling machine’ drill-rod dynamic behavior under the action of axial vibro-impact load, in order to identify the frequency ranges of higher-order vibration excitation and make the analysis of the impact of such excitation on stability. The material destruction during the vibro-rotary drilling occurs via the complex effect of the vibration impulses and rotational motion. This fact significantly facilitates the drilling process of wells in hard rocks. In this case, the oscillations can occur with change of half-waves number which the mode of oscillations is changed. In this way, the task of the dynamic behavior of studying system in order to identify the frequencies of vibro-impact action at which the bending oscillations occurs with growth of half-wave number becomes interesting. To find such frequency ranges of axial impact load action on oscillating rod during rotation, the theoretical study was done by developed software, in which the technique of computer simulation of the oscillating motion of considerable length rotating rods under the action of axial periodic loads is implemented. Using this software the diagrams that show the ranges of impact frequencies in which the oscillations occurs with growth of half-wave number of rod elastic line were drawn for different parameters of the considered system. These diagrams were drawn against the background of dynamic stability fields depending on the ratio of rotation speed and impact frequency. The presented results show that for rods with different lengths there are ranges of frequencies of vibro-impact load at which the transverse oscillations occurs with growth of half-wave number. It is noted that with increasing of rotational speed for certain length rods the range of impact frequencies where the half-waves number is increased, expands. In this region, the oscillation amplitude is increases, too, with intensive growth in regions of unstable oscillations. The conclusion about the possibility of running the equipment in certain frequency ranges is made.
References
Bazhenov V.A., Pohorelova O.S., Postnikova T.G. Khaos ta stsenariyi perekhodu do khaosu u vibroudarniy systemi (Chaos and transition scenarios to chaos in a vibration-shock system). – Kyiv: Vyd-vo «Karavela», 2019. – 146 p.p.
Gulyayev V.I., Gaydaychuk V.V., Khudolii S.N. Kompyuternoe modelirovanie dinamiki konstruktsii ustanovok glubokogo bureniya (Computer modeling of dynamics of deep drilling rigs’ constructions). Scientific Works Journal of the Ukrainian Research Institute of Steel Structures named after V.M. Szymanowski. – 2009, 4, 208-216.
Gulyayev V.I., Khudolii S.N., Andrusenko E.N. Nelineinoe deformirovanie burilnikh kolonn v sverkhglubokikh tsilindricheskikh skvazhinakh (Nonlinear deformation of drill strings in ultra-deep cylindrical wells). Scientific Works Journal of the Ukrainian Research Institute of Steel Structures named after V.M. Szymanowski. – 2012. 9. 5-17.
Gulyayev V.I., Lugovoi P.Z., Andrusenko E.N. Chislennoe modelirovanie uprugogo izgiba burilnoi kolonni v sverkhglubokoi krivolineinoi skvazhine (Numerical modeling of elastic bending of a drill string in an ultra-deep curved borehole). Applied Mechanics. – 2014, 50 (4). 67-76.
Lizunov P., Nedin V. Parametrychni kolyvannia pruzhnykh sterzhniv, shcho obertaiutsia, pid diieiu periodychnykh pozdovzhnikh syl (The parametric oscillations of rotating elastic rods under the action of the periodic axial forces) // Management of Development of Complex Systems. – 2020, 44, 56-64.
Lizunov P.P., Nedin V.O. Stiikist sterzhniv, shcho obertaiutsia, pid diieiu vibroudarnoho navantazhennia (The stability of rotating rods under the action of vibro-impact load). Strength of materials and theory of structures. – 2021. – Issue 106, 113-121.
Nedin V. Numerical differentiation of complex bend forms of long rotating rods // Management of Development of Complex Systems. – 2020, 43, 110-115.
Changgen Bu. Arithmetic solution for the axial vibration of drill string coupling with a down-the-hole hammer in rock drilling / Changgen Bu, Xiaofeng Li, Long Sun and Boru Xia // Journal of Vibration and Control. – 2016, Vol. 22(13). – P. 3090-3101.
Liping Tang. Effects of axial impact load on the dynamics of an oilwell drillstring / Liping Tang, Xiaohua Zhu, Hongzhi Lin // Advances in Mechanical Engineering. – 2019, Vol.11 (3), 1-8. doi: 10.1177/1687814019836876.
Maurice Petyt. Introduction to Finite Element Vibration Analysis. Cambridge University Press, 1990. – 558 p.
Songyong Liu. Coupling vibration analysis of auger drilling system / Songyong Liu, Xinxia Cui, Xiaohui Liu // Journal of vibroengineering. – 2013. Vol. 15. – P.1442-1453.
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
