Applied Mechanics and Materials Vol. 607

Abstract: In this paper, calculating the deformation and the static strength of the fluid channel during the process of casing hanger running, well cementation and oil production with ANSYS. Researching the effect of the fluid channel deformation on drain and decompression, and the effect of the fluid channel stress concentration position and its existence on casing hanger structure strength. On the basis of those research, ascertaining the optimum range of the fluid channel aperture.

Abstract: In order to meet the requirements of high-precision machine tool, it has been an important factor to select an appropriate way to support the bed. By building a multidisciplinary optimization (MDO) process based on iSIGHT, this article select the deformation difference of the guides and the deformation difference of the joint surface between column and bed of the machine tool as the objective functions, and then conduct a multi-objective optimization (MOO) of the positional parameters of the three-point support. Eventually the optimization result is given and the optimal position of the three-point support is determined.

Abstract: Rubber played a buffer role in prosthetic knee motion. Rubber bearing is a very complicated process, and rubber material itself is nonlinear. ABAQUS software can able to deal with highly nonlinear problems. Input rubber test data in ABAQUS, selection of constitutive model, and then the finite element model is established, which is calculated, finally obtains compression under different loads.

Abstract: The article introduce the mechanical structure and the principles of 80000 N·m torsion testing machine, the structure and the principles of checking power unit of this kind of testing machines and the control manner and the principles of the electronic control system, than expound the benefits of the equipment and its application.

Abstract: According to the insufficient in the dispersion PID control method of 5 degree of freedom bearing-less motor suspension control system, based on the rigid body kinematics principle, this paper presents a whole PID control method for 5 degree of freedom levitation force, the mathematical modeling has been established, through the experiment, it is proved validity and practicability, The results of experiment show that, compared to the dispersion PID control method, the whole PID control method improves the interference immunity of bearing-less motor output effectively.

Abstract: A mounting system of a geared turbofan (GTF) engine is presented. It play a static determined structure when connecting the engine and aircraft pylon. To conduct the test on the mounting system a fake engine body is designed. The experiment setup is also demonstrated. The finite element (FE) modeling on the mounting system is studied using MSC/NASTRAN and then the main parameters of key parts are given. The presented method is validated with static analysis. A normal mode analysis of the model also shows that it can be adopted in the dynamical design.

Abstract: To break through the process problem of thinning spinning instability on extra thin-wall and height diameter/thickness ratio tube,this paper applied the finite element software MSC.MARC to simulate the drum instability phenomenon of thinning spinning under the condition of different diameter/thickness ratio.Analysed the process of the drum instability of workpiece.And explain the characteristics of stress field and flow field of the workpiece and the instability mechanism in the deformation area.So as to provide theoretical guidance for researching the stable precision spinning of cylindrical workpiece with extra thin-wall and height diameter/thickness ratio.

Abstract: This paper presents a novel solar dish configuration which can attain a high concentration factor and also facilitate substantial on board energy storage while being low in projected manufacturing cost. This is due to minimizing the requirement for extreme rigidity and accuracy in the design, in turn through reducing the cantilever distance from dish to receiver. This is done by using a novel split / recombined focus arrangement, enabling rim angles up to 90⁰, thus bringing the focal point much closer to the dish than standard dishes, which typically use approximately 45⁰. This research is potentially significant for dish Concentrating Solar Power (CSP) in general and other emerging CSP systems that require high concentration factors.

Abstract: A control scheme named the variable-lateral-force cavitator was proposed based on the theory of traditional variable-drag cavitator, the three-dimensional cavitating flow around the cavitator was investigated as well. It is confirmed that the drag, lift, lateral forces and cavity size of underwater vehicle can be effectively adjusted through the movements of control element of variable-lateral-force cavitator in both longitudinal and circumferential directions. In addition, an amount of pitching (or yawing) force equivalent to 30% of drag in magnitude will be produced when the displacement of control element on either side is inconsistent with each other, and the cavity section appears concave inwards simultaneously.

Abstract: The objective of the present paper is a numerical analysis of the transient flow through a 4/3 hydraulic closed center direction control valve. The real-time discharge coefficients corresponding to supply flow difference have been considered. In order to develop an intelligent control system for an electro-hydraulic system (EHS), a new controller has recently been proposed to control those parameters in a complex system. However, a mathematical model of the EHS including the transient parameters has not been clarified. The main objective of this paper is to numerically analyze the dynamic characteristics of the directional control valve and also the flow behaviors in the electro-hydraulic system control. Both the steady state and transient flow though the valve which affect to flow-pressure coefficient were numerically considered. Moreover, this paper presents numerical results, which explain the flow behaviors related with the real-time pressure drop and discharge coefficient. Both a high inlet flow and a large opening spool have determined the pressure drop increment.