Fluid-structure Interaction Dynamic Analysis Of Rotary Slender Beam In Pipe

The rotary slender beam in pipe is the peculiar structure in the chemical engineering machinery and oil drilling and production engineering. The research of the rotary slender beam fluid-structure interaction dynamics analysis was presented the theoretical significance and application for the structure optimized design and the optimization of the process parameters. The rotary slender beam is collision with the pipe inner wall about different annular clearance. The rotary slender beam also has fluid interaction in its inside and outer annular. It forms a complex nonlinear fluid-structure interaction system. First, the dynamic gap element, three-dimensional beam element and Newmark integral method is adopted. The rotary slender beam in pipe is proceeded collision and contact dynamical analysis. The impact is obtained about the parameters of the time step and the integral constant to the result of the dynamical analysis. Second, the three-dimensional fluid dynamics analysis model is established with different eccenters. It is revealed that the variable rule about the eccentric annulus fluid flow characteristics and interfacial force with the speed and eccentricity. If the eccentricity is greater than 0.8, the interfacial force about the axial uniform cross section eccentric annulus helical flow can prevent the eccenter. Third, The experimental simulation apparatus is designed and established about the rotary slender beam fluid-structure interaction system. It is studied the variable rule of the impact about the flow rotate speed and the flow rate to the movement condition, and. the fluid-structure interaction effect of rotary slender beam and helical flow inside and outer of pipe. Finally, The rotary slender beam is scattered to several beam elements along axial line. The hydraulic pipelines is scattered to several equal long three-dimensional hydraulic pipelines fragment. The annular flow is scattered to random eccentric annular flow fragment. Every fluid fragment is also scattered to tetrahedron and hexahedron grid. The three-dimensional numerical model is established about the fluid-structure interaction dynamic analysis of rotary slender beam in pipe. The equations of the structure dynamics, fluid equation of continuity and momentum equation are coupled. The calculation formula about the interface force and displacement with eccentricity and eccentric angle are derived. The congruent iterative format and convergence criterion are also derived. The method about the fluid-structure interaction dynamic analysis is proposed. In order to solve the problem great quantity element number of the hydraulic pipelines and annular flow and the disability of the PC machine, the characterization database about the hydraulic pipelines and the annular flow is established. The database is able to automatic record and extract the fluid analysis result of different flow fragment and different technological parameters. Based on the above models and theories, the computer program is compiled about the fluid-structure interaction dynamic analysis of rotary slender beam in pipe. The fluid-structure interaction effect was showed by example. The fluid-structure interaction numerical arithmetic result was fundamental coincided with the experimental result. It was verified that the validity of the fluid-structure interaction theoretical method. The results of research in this article would provide a theoretical and arithmetic method for the fluid-structure interaction analysis of the rotary slender shaft, the stirring shaft in the chemical engineering machinery and the rod string and drill string in the oil drilling and production engineering.