To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system,a multi-floating planetary gear system that includes a floating central component and a quasi-fl...To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system,a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is employed.Then a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing behaviors.Some influencing factors,such as supporting stiffness,positions error of sun or carrier,and external input load are analyzed on the dynamical load sharing of the planetary gear system with multi-floating components.The results demonstrate that the load sharing condition of the system is best when both the sun gear and planet gears are multi-floating at the same time.When the planet gear position errors remain constant,reducing the flexible pin stiffness of planet gear or increasing external input load can effectively improve the load sharing.These conclusions are verified by the relevant experiments.展开更多
The growing demand for ocean space has generated significant interest in multi-body floating systems,where gap resonance in confined regions plays a critical role in ensuring the safety of offshore operations.This stu...The growing demand for ocean space has generated significant interest in multi-body floating systems,where gap resonance in confined regions plays a critical role in ensuring the safety of offshore operations.This study develops a numerical tank model using the Smoothed Particle Hydrodynamics(SPH)method,implemented through the open-source code DualSPHysics,to investigate hydrodynamic resonance in a twin-floater system and to examine the influence of internal tank sloshing on its hydrodynamic characteristics.The hydrodynamic behavior of the gap flow between a fixed twin-floater system in the numerical tank is validated through systematic comparison with experimental data.Subsequently,the wave-induced motions and forces on a twin-floater system are compared with those on a single floater.Furthermore,the effects of internal tank sloshing on the hydrodynamic response of the twin-floater system are explored.A parametric study is conducted to analyze the influence of incident wave frequency on floater motion and tank sloshing dynamics.The results show that the presence of an internal tank can significantly reduce pitch motion and vertical forces on the floating body,while exerting minimal influence on heave motion and horizontal forces.The findings provide new insights into the hydrodynamic performance of twin-floater systems and their interaction with internal sloshing phenomena.展开更多
Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middl...Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middle or mini type of vessels and ships can be moored to it. Based on the analysis of computational methods of multi-body motion response, a hydrodynamic model is set up and the three-dimensional potential theory in finite depth is adopted to calculate the three-dimensional motion response of this system. The double P-M spectrum is used to analyze the motion response in irregular waves. Different wave directions are specially taken into consideration, due to their various effects to the motion response. Furthermore, the calculated result is compared with that of the experiment, and it is proved that sway, heave, pitch and yaw motion are greatly constrained by mooring system. The comparison also indicates that the model can forecast the motion performance of the target, and that the calculated result can also be used as reference in connector and mooring system design.展开更多
基金support provided by the National Natural Science Foundation of China Nos.51405048 and 51375519the China Postdoctoral Science Foundation No.2016M590861+2 种基金the Chongqing Research Program of Frontier and Application Foundation No.cstc2014jcyjA70010the Foundation of Municipal Education Committee of Chongqing No.KJ1705129the CQJTU Program of Study Abroad for Young Scholar for their support of this research.
文摘To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system,a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is employed.Then a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing behaviors.Some influencing factors,such as supporting stiffness,positions error of sun or carrier,and external input load are analyzed on the dynamical load sharing of the planetary gear system with multi-floating components.The results demonstrate that the load sharing condition of the system is best when both the sun gear and planet gears are multi-floating at the same time.When the planet gear position errors remain constant,reducing the flexible pin stiffness of planet gear or increasing external input load can effectively improve the load sharing.These conclusions are verified by the relevant experiments.
基金supported by the National Natural Science Foundation of China(Nos.52271316 and 12302314)the Science and Technology Project in Guangzhou(No.2024A04J9886).
文摘The growing demand for ocean space has generated significant interest in multi-body floating systems,where gap resonance in confined regions plays a critical role in ensuring the safety of offshore operations.This study develops a numerical tank model using the Smoothed Particle Hydrodynamics(SPH)method,implemented through the open-source code DualSPHysics,to investigate hydrodynamic resonance in a twin-floater system and to examine the influence of internal tank sloshing on its hydrodynamic characteristics.The hydrodynamic behavior of the gap flow between a fixed twin-floater system in the numerical tank is validated through systematic comparison with experimental data.Subsequently,the wave-induced motions and forces on a twin-floater system are compared with those on a single floater.Furthermore,the effects of internal tank sloshing on the hydrodynamic response of the twin-floater system are explored.A parametric study is conducted to analyze the influence of incident wave frequency on floater motion and tank sloshing dynamics.The results show that the presence of an internal tank can significantly reduce pitch motion and vertical forces on the floating body,while exerting minimal influence on heave motion and horizontal forces.The findings provide new insights into the hydrodynamic performance of twin-floater systems and their interaction with internal sloshing phenomena.
基金This studyis supported bythe National Natural Science Foundation of China(Grant No.50570047)
文摘Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middle or mini type of vessels and ships can be moored to it. Based on the analysis of computational methods of multi-body motion response, a hydrodynamic model is set up and the three-dimensional potential theory in finite depth is adopted to calculate the three-dimensional motion response of this system. The double P-M spectrum is used to analyze the motion response in irregular waves. Different wave directions are specially taken into consideration, due to their various effects to the motion response. Furthermore, the calculated result is compared with that of the experiment, and it is proved that sway, heave, pitch and yaw motion are greatly constrained by mooring system. The comparison also indicates that the model can forecast the motion performance of the target, and that the calculated result can also be used as reference in connector and mooring system design.
