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Optimization and experimental verification of the vibro-impact capsule system in fluid pipeline. (2018)
Journal Article
YAN, Y., LIU, Y., JIANG, H., PENG, Z., CRAWFORD, A., WILLIAMSON, J., THOMPSON, J., KERINS, G., YUSUPOV, A. and ISLAM, S. 2019. Optimization and experimental verification of the vibro-impact capsule system in fluid pipeline. Proceedings of the Institution of Mechanical Engineers, part C: journal of mechanical engineering science [online], 233(3), pages 880-894. Available from: https://doi.org/10.1177/0954406218766200

This paper studies the prototype development of the vibro-impact capsule system aiming for autonomous mobile sensing for pipeline inspection. Self-propelled progression of the system is obtained by employing a vibro-impact oscillator encapsuled in th... Read More about Optimization and experimental verification of the vibro-impact capsule system in fluid pipeline..

State switching of a multistable impacting system using PD-like control. (2018)
Journal Article
LIU, B., FUNG, W.-K. and LIU, Y. 2018. State switching of a multistable impacting system using PD-like control. MATEC web of conferences [online], 148: proceedings of the 2017 International conference on engineering vibration (ICoEV 2017), 4-7 September 2017, Sofia, Bulgaria, article number 10001. Available from: https://doi.org/10.1051/matecconf/201814810001

A new PD-like control law is proposed in this paper to control a multistable impacting system. This control law can switch the system from a current, undesired state to a desired one by using the differences of the displacement and velocity between t... Read More about State switching of a multistable impacting system using PD-like control..

Proof-of-concept prototype development of the self-propelled capsule system for pipeline inspection. (2017)
Journal Article
YAN, Y, LIU, Y., PÁEZ CHÁVES, J., ZONTA, F. and YUSUPOV, A. 2018. Proof-of-concept prototype development of the self-propelled capsule system for pipeline inspection. Meccanica [online], 53(8), pages 1997-2012. Available from: https://doi.org/10.1007/s11012-017-0801-3

This paper studies the prototype development for the self-propelled capsule system which is driven by autogenous vibrations and impacts under external resistance forces. This project aims for proof-of-concept of its locomotion in pipeline environment... Read More about Proof-of-concept prototype development of the self-propelled capsule system for pipeline inspection..

Numerical and experimental studies of stick-slip oscillations in drill-strings. (2017)
Journal Article
LIU, Y., PÁEZ CHÁVEZ, J., DE SA, R. and WALKER, S. 2017. Numerical and experimental studies of stick-slip oscillations in drill-strings. Nonlinear dynamics [online], 90(4), pages 2959-2978. Available from: https://doi.org/10.1007/s11071-017-3855-9

The cyclic nature of the stick-slip phenomenon may cause catastrophic failures in drill-strings or at the very least could lead to the wear of expensive equipment. Therefore, it is important to study the drilling parameters which can lead to stick-sl... Read More about Numerical and experimental studies of stick-slip oscillations in drill-strings..

Development of a self-propelled capsule robot for pipeline inspection. (2016)
Conference Proceeding
YUSUPOV, A. and LIU, Y. 2016. Development of a self-propelled capsule robot for pipeline inspection. In Xu, Z. and Wang, J. (eds.) Tackling the new challenges in automation and computing: proceedings of the 22nd International conference on automation and computing (ICAC 2016), 7-8 September 2016, Colchester, UK. Piscataway: IEEE [online], pages 84-88. Available from: https://doi.org/10.1109/IConAC.2016.7604899.

This paper introduces a current research project carried out in the Robert Gordon University for developing the prototype of the vibro-impact capsule robot for pipeline inspection. The project aims to address the technical bottlenecks which have been... Read More about Development of a self-propelled capsule robot for pipeline inspection..

Optimization of the vibro-impact capsule system. (2016)
Journal Article
LIU, Y., ISLAM, S., PAVLOVSKAIA, E. and WIERCIGROCH, M. 2016. Optimization of the vibro-impact capsule system. Strojniški vestnik: journal of mechanical engineering [online], 62(7-8), pages 430-439. Available from: https://doi.org/10.5545/sv-jme.2016.3754

Optimization of the vibro-impact capsule system for the best progression is considered in this paper focusing on the choice of the excitation parameters and the shape of the capsule. Firstly, the fastest and the most efficient progressions are obtain... Read More about Optimization of the vibro-impact capsule system..

Hidden chaotic attractors in a class of two-dimensional maps. (2016)
Journal Article
JIANG, H., LIU. Y., WEI, Z. and ZHANG, L. 2016. Hidden chaotic attractors in a class of two-dimensional maps. Nonlinear dynamics [online], 85(4), pages 2719-2727. Available from: https://doi.org/10.1007/s11071-016-2857-3

This paper studies the hidden dynamics of a class of two-dimensional maps inspired by the Hénon map. A special consideration is made to the existence of fixed points and their stabilities in these maps. Our concern focuses on three typical scenarios... Read More about Hidden chaotic attractors in a class of two-dimensional maps..

Anti-phase synchronization and symmetry-breaking bifurcation of impulsively coupled oscillators. (2016)
Journal Article
JIANG, H., LIU, Y., ZHANG, L. and YU, J. 2016. Anti-phase synchronization and symmetry-breaking bifurcation of impulsively coupled oscillators. Communications in nonlinear science and numerical simulation [online], 39, pages 199-208. Available from: https://doi.org/10.1016/j.cnsns.2016.02.033

This paper studies the synchronization in two mechanical oscillators coupled by impacts which can be considered as a class of state-dependent impulsively coupled oscillators. The two identical oscillators are harmonically excited in a counter phase,... Read More about Anti-phase synchronization and symmetry-breaking bifurcation of impulsively coupled oscillators..

Path-following analysis of the dynamical response of a piecewise-linear capsule system. (2016)
Journal Article
CHAVEZ, J.P., LIU, Y., PAVLOVSKAIA, E. and WIERCIGROCH, M. 2016. Path-following analysis of the dynamical response of a piecewise-linear capsule system. Communications in nonlinear science and numerical simulation [online], 37, pages 102-114. Available from: https://doi.org/10.1016/j.cnsns.2016.01.009

The dynamical response of a piecewise-linear capsule system is studied by means of path-following techniques in this paper. As the capsule model belongs to the class of piecewise-smooth dynamical systems involving impact and friction, a special care... Read More about Path-following analysis of the dynamical response of a piecewise-linear capsule system..

Experimental verification of the vibro-impact capsule model. (2015)
Journal Article
LIU, Y., PAVLOVSKAIA, E. and WIERCIGROCH, M. 2016. Experimental verification of the vibro-impact capsule model. Nonlinear dynamics [online], 83(1-2), pages 1029-1041. Available from: https://doi.org/10.1007/s11071-015-2385-6

In this paper, an experimental verification of the vibro-impact capsule model proposed by Liu et al. in [1-3] is presented. The capsule dynamics is investigated experimentally by varying the stiffness of the support spring, and the frequency and the... Read More about Experimental verification of the vibro-impact capsule model..

Suppressing stick-slip oscillations in underactuated multibody drill-strings with parametric uncertainties using sliding-mode control. (2015)
Journal Article
LIU, Y. 2015. Suppressing stick-slip oscillations in underactuated multibody drill-strings with parametric uncertainties using sliding-mode control. IET control theory and applications [online], 9(1), pages 91-102. Available from: https://doi.org/10.1049/iet-cta.2014.0329

Stabilisation of multibody drill-strings which exhibit stick-slip oscillations is studied in this paper from the point of view of underactuated system. The model has one control torque input acting on the rotary table from the land surface and multi-... Read More about Suppressing stick-slip oscillations in underactuated multibody drill-strings with parametric uncertainties using sliding-mode control..

Forward and backward motion control of a vibro-impact capsule system. (2014)
Journal Article
LIU, Y., PAVLOVSKAIA, E., WIERCIGROCH, M. and PENG, Z. 2015. Forward and backward motion control of a vibro-impact capsule system. International journal of non-linear mechanics [online], 70, pages 30-46. Available from: https://doi.org/10.1016/j.ijnonlinmec.2014.10.009

A capsule system driven by a harmonic force applied to its inner mass is considered in this study. Four various friction models are employed to describe motion of the capsule in different environments taking into account Coulomb friction, viscous dam... Read More about Forward and backward motion control of a vibro-impact capsule system..