Applied Mechanics and Materials Vol. 607

Abstract: Aimed at the problem of data transmission in low speed, this paper employs a new system, which contains galvanometer, laser sensor, periphery and FPGA-the core of the system. Describe the working process of hardware and software design. Experiment shows that laser scanning frequency reaches 30 KHz, galvanometer triggering time is less than 300 ns and galvanometer works continuously.

Abstract: In this paper, analysis and design of an upper turntable of general vertical rocket rivet fixture are presented by employing the finite element methods and topology optimization design which are based on the variable density method, in order to reduce the mass and volume of the turntable of general vertical rocket rivet fixture and improve rivet precision. During the design the loadcase is considered: constant force and torque, which is simplified and closer to actual working conditions. From static analysis of the original turntable, a topology optimization model was set up. By using topology optimization calculations a new turntable model was built and the analysis of it using finite element methods was carried out. Comparison between the optimized model and original was conducted and the results show that the stiffness was remarkably improved, the stress was well-distributed and the displacement was reduced after optimization. For designing other complicated structures this method can also provide reference and guidance.

Abstract: (minimum 200words, maximum 300-500words) The solid expandable tubular technology is one of the most important ones which play key role in 21st century’s oil drilling industry. The expandable thread connection is one of the key factor of the technology which decide the success or failure of expansion casing site construction. Finite element simulation can help analyze the feasibility effectively on expandable casing thread connection structure design and save a lot of material and financial resources. According to a special expansion casing thread which with single hook thread characteristics, metal seal cylinder and seal ring, this paper use the finite element simulation analysis method to learn the stress, strain and displacement being occurred in thread connection during the process of expansion. The finite element simulation analysis results shown that the wall thickness decreased about 0.66mm after the expansion, the maximum stress of expandable casing connection during expansion was 494 MPa which between the yield stress(s_s= 380MPa) and ultimate strength(s_b= 650MPa) of the casing material, the most dangerous place of thread connection was the roots of thread, there was gapless between contact surfaces of the messing thread with contact pressure during the expansion, and the rubber sealing ring kept the state with the minimum 4.64 MPa compress stress during the expansion. Through the simulation, It can come to a conclusion that the special thread structure could meet the expected connection and seal function effectively during the expansion process, which provides an important basis for the following thread processing and expansion test.

Abstract: Thermal production is an important heavy oil recovery method , which bothers with the complex problems of Thermo-Hydro-Mechanical coupling effects and reservoir failure processes due to thermal recovery. Based on the coupling theory of T-H-M, the fully coupling equations of heat transfer, fluid seepage, geomechanics, and reservoir damage are constructed. The Galerkin FEM with fully implicit and sequential iterative algorithm is adopted to solve the coupling equations. Numerical results demonstrate that Thermo-hydro-mechanical coupling effect takes as important roles in thermal process. The response of the rocks surrounding the reservoir has a significant stress transfer, pore pressure increase or thermal cracking. This paper presents an analytical method to predictions coupled geomechanical effects and change of reservoir parameters, which are all important phenomena affecting heavy oil exploitation.

Abstract: In order to grasp the braking effect of the portal crane after the installation of auxiliary wind safety device, the braking process of real harbor crane with dual-stage windproof braking system exposed to fluctuating wind is simulated. The effect on the crane braking performance of braking device response lag and artificially lowering working braking force is also analyzed. It is demonstrated that the dual-stage brake system is superior to the single and could improve the windproof ability when working braking force decline.

Abstract: By using experimental method, the optimal operating values of inlet and water consumption are derived at each dust concentration.And the FLUENT is used to simulate the gas-liquid-solid three-phase flow field in the radial-straight-vane wet fan,whose results show the effects of flow speed, stress distribution, droplets and dust particles on flow field.Based on the analysis of other influence factors,the paper proposes a further improvement for the fan as well.

Abstract: To meet the demand of the innovative teaching research in machinery or relevant major, a connecting rod teaching machine based on metamorphic mechanisms was put forward, which was suitable for the teaching and experiment simultaneously, improving the teaching effectiveness. The metamorphic mechanism was proposed as the kernel of whole design, integrating multiple evolution of linkage. The virtual prototype technology is applied to create model. The dynamic simulation of topological change in the process was carried out to verify the feasibility of mechanism motion, and two solutions to reduce impact were put forward. The screw transmission telescoping mechanism was designed. Parameter simulative analysis of the model by ADAMS verified the rationality of the design, combining with mechanical analysis.

Abstract: For evaluating the stress state of the jack more precise, the technology of flexible modeling was applied to structure design of the jack. The simulation model with rigid body of the components were set up by AutoFlex module, and the jack’s dynamic curves in static loads were acquired through flexible simulation, then the dynamic characteristic and stress state of the jack which in working process was understand. Based on that, some basis was offered for improvement and reliability design of the jack.

Abstract: Trough roller is an important component part on belt conveyor, the carrying capacity of the roller is a basis of belt conveyor. The calculation principle and method of material’s cross section area is deduced in the thesis, and mechanical analysis of the trough roller is carried out based on that, in results, the static load of it is calculated. The finite element model of the trough roller is set up by Simulation /Works software, and then the stress and deformation results of it is clear through finite element statics calculation and analysis. Based on this thesis, some valuable basis and reference are offered to trough roller’s strength and stiffness design.

Abstract: The internal flow field and the noise of inlet blocking fault and trouble-free for control valve are numerical simulated by CFD. The study shows that it is a greater influence on the internal flow field by inlet blocking, the back-end of stemming appears reverse flow, and it make vortex, the phenomenon of the two fluids mixing is appeared below the valve core. The tremendous noise is appeared in the blocking, and it increases the noise of the surrounding area.