Applied Mechanics and Materials Vols. 321-324

Abstract: Extend end-plat bolted connections are widely used in steel frames. The rotational stiffness has great influence on steel frame stiffness and deformation. The decrease of the frame lateral stiffness, due to connection rotational deformability, leads to the increase of the period of vibration and the frame sensitivity to second-order effects. This thesis divides the end plate into several parts equivalent to different Timoshenkos beams to determine their contribution to rotational stiffness of the connection. Then stiffness of all parts and bolts is given, and then the component method is used to calculate rotational initial stiffness of extended end-plate connections. Comparisons with results of ANSYS and related tests show that the proposed equations have excellent precision. And the calculating process is simple and easily applicable in practice.

Abstract: Focusing on PET perform molding features, working principles of MA5300 Injection Molding Machine’s clamping unit’s hydraulic system has been analyzed in this paper. Based on previous hydraulic system, magnetic exchange valve has been added on the demoulding hydraulic circuit, demolding speed has been fastened; energy accumulator has been added on the control circuit so as to stabilize controlled oil-source, improve time of opening and clamping mould and response speed. In addition, common one-way valve in core oil circuit is replaced with hydraulic control one-way valve, in order to realize pressure maintaining function; hydraulic insurance structure is changed into inner circulation, and two-way cartridge valve is used as security valve, so as to realize faster response, and largely improved equipment security. Through adopting common hydraulic components, under the premise of limited increasing cost, the injection molding cycle for PET perform product has been reduced, and enterprise’s productivity has been improved.

Abstract: 3D modeling process and shaped conductor of head face of helical rotor is described, and the constructing method of critical curves of head face is explained in detail. The processing principle of helical rotor is discoursed in paper and the four-axis tool path of the helical rotor based on ball cutter is deduced in UG environment. The Dynamic Process Simulation of tool path is finished, which Verify the feasibility of tool paths

Abstract: Show the layout of subsea manifold piping system, whose design base on the relevant parameters of the E oil and gas field in West Africa. The piping system adapt to the sea situation. The maximum stress of the piping system is within the allowable range under wind load, the pressure and temperature stress of circulating medium and wave load, even in the splash zone, and passed the stress test.

Abstract: With the increasing for crane in the industrial production, its structural reliability has now been an important concept to guarantee stable performances. The structural safety for the traditional stochastic and probabilistic reliability method is both measured with the viewpoint of probability. But large crane structure with low fault rate is often unable to get necessary statistic data. The new developing crane also has not large amount of statistical data due to no precedent of use. Aiming to these problems, the reliability analysis based on possibility theory is supplied. The method abandons two value state hypotheses, and can avoid a large number of sample collection and the impact of human factors. Compared with the probability methods applied to the crane structure, the possibility reliability method is not only feasible, but also reduces the computational error.

Abstract: In order to verify the similarity of the servo system of the main-fin and the flap-fin of the established fin-flap control physical simulation system in the drive way with the prototype system, the method of equivalence analysis based on the principle of similarity is proposed in this paper. In order to better determine the weights of each subsystem, the consistency correction method of the judgment matrix is studied combined with hierarchical analysis principle. Finally, the main-fin / flap-fin servo system is taken for example to analyze the equivalence of flap-fin control of physical simulation system, and the proposed method in this paper is proved to be feasible.

Abstract: In this paper,in view of the fork head often broken of the main drive system of a medium thickness plate mill,finite element analysis software ANSYS is used to establish universal coupling model and analyse static strength of the universal coupling, woning maximum stress value of the fork head and cross shaft at maximum load and analysing fracture reason of the fork,which could provide a theoretical basis for the cross shaft universal coupling strength analysis and structural optimization design.

Abstract: This paper aims to highlight the current line of flow through a ball valve for opening its different angles. We chose to study the values of values 30o, 45o, 60o and 75o as represented in figures. Flow simulations were performed using Fluent 6.3 software, power lines are marked by their tangent vectors speed. For a default value of power flow and pressure were represented power lines following the turbulence and hence the increased loan losses occur. This ball valve operation analysis may reveal different hydraulic energy losses given conditions different valve opening and leads to a modern design and dynamic analysis of operation.

Abstract: This article proposes two types of Lumped parameter models for the hydraulic bushing. Digital computation method is used to estimate the system parameters of LP model, provides a new way to reduce development cycle of hydro bushing. Two results of hydro-bushing dynamic behavior using two LP models are compared and analyzed. This article provides more channel to analyze the operation principle of the hydraulic bushing.

Abstract: Taking the typical axisymmetric flywheel as an example in this paper, use APDL (ANSYS parametric design language) to analyze the stress of the flywheel stucture under the maximum load through parametric modeling, parametric meshing, parametric solving and parametric postprocessing, etc. Optimize the flywheel structure through reconstruction and reanalysis with the APDL, the optimizition result shows that APDL is a good solution for the optimization design of the flywheel structure.