Applied Mechanics and Materials Vols. 143-144

Abstract: A finite element model was developed for simulation of two side direction burr formation process. Based on strain distribution, a two side burr formation mechanism was proposed. Burr form and burr size of simulation are close to that's of experiment. Finite element model generated here provided a numerical analysis method to solve the prediction of burr and chip formation and physical insight into the fundamental burr formation mechanism. The stain in two side direction of material near the side face decides the shape and the size of two side direction. Multi-workpieces are machined at the same time with side face closely by each others can control the formation of two side direction strain and two side direction burr.

Abstract: A virtual prototype model of S195 diesel engine was established by using CAD, finite element analysis based on virtual prototype technology and dynamics theory of flexible multibody systems to study the kinetic discipline of the crank-rod mechanism,vibration of cylinder block caused by inertia force and the balance problem of inertia force.The rigid body and flexible body simulation were compared.The interaction force between components could be determined by flexible multibody dynamics analysis of the crankshaft system under the real working condition. The simulation results are accordant with those in true working state of S195 diesel engine. This research provides a feasible advanced method for design and development of diesel engine.

Abstract: A dynamic finite element analysis model for cylindrical roller bearing is developed, and the complex stress distribution and dynamic contacting nature of the bearing are investigated carefully based on ANSYS/LS-DYNA. Numerical simulation results show that the stress would be bigger when the element contacting with the inner or outer ring than at other times, and the biggest stress would appear near the area that roller contacting with the inner ring. Phenomenon of stress concentration on the roller is found to be very obvious during the operating process of the bearing system. The stress distributions of different elements are uneven on the same side surface of roller in its axis direction. Numerical simulation results can give useful references for the design and analysis of rolling bearing.

Abstract: Coal mine rescue capsules, whose structural strength defines miners' safety directly, are becoming important equipments for miners' underground surviving. In order to improve the rescue capsule's strength, in this study two different kinds of stiffeners were put forward. The advantages and disadvantages of their performances were analyzed and compared using mechanical theory and the theoretical analysis was simulated and verified by using finite element software ABAQUS. The maximum deformation using two different kinds of stiffeners were 1.385mm and 2.26mm. Considering the size of deformation combined with practical factors, such as installation space and ease of processing etc., T-shaped stiffeners were finally adopted. Introduction

Abstract: By advanced research and technology breakthrough to service architecture and related critical technologies, the 3D process design environment based on SOA is built. These are finished to integrate initially for concurrent collaborative platform crossed system or department and to service the functions frame of integrated discuss, collaborative modeling & simulation and collaborative PDM/PLM. This design environment is very important to resource integration, functions complemented and collaborative process among partners in virtual enterprise.

Abstract: Excavators can be divided into two categories: hydraulic excavator and mechanical excavator. Due to the flexibility and mobility, hydraulic excavator has almost replaced the mechanical excavator. But there still exists some problems such as hydraulic leaks and high costs of manufacturing and maintaining. On the other hand, the latter one is the excavator of choice in oil sands digging and surface mining for its durability, high productivity and low ownership costs resulting from long economic operating life, but lacks flexibility due to the structural limitations. This paper introduces an innovative design of mechanical excavator with controllable mechanism based on functional analysis of the traditional hydraulic excavator. The solving model in the form of Function-Effect-Technical Action Process-Executive Action-Mechanism (F-E-P-A-M) is used. A planar 2 Degree-OF-Freedom (DOF) controllable mechanism is adopted as the executive mechanism. A backhoe type and a face shovel type excavator both with the ability to accomplish flexible output trajectories by the joint operations of three servo-motors are proposed.

Abstract: Based on the characteristics of low efficiency and short life cycle of the previous face gear in the clutch, the article puts forward a new type of the face gear. The new face gear can joggle interlaced gear, transfer large torque and extend service life. The article describes the history and recent research of the gear fear, compares the structural characteristics of the previous face gear and the new face gear and analyzes the theory of the strength calculation for the transmission intensity of the new face gear. What's more, simulations based on finite element analysis draw the face gear transmission strength and provide a reliable basis for the strength design of the new face gear.

Abstract: In this paper, a new design method of cam is developed .To illustrate this method,a car which adopts cam mechanism to achieve specific movements is designed. By establishing the relationship between the point coordinates of cam profile and the track through the relevant mathematical models, and using the infinitesimal elements method to solve the models, the discrete points coordinates of the cam profile are obtained. The displacement, velocity and acceleration of the direction arm are simulated by Pro/E. the accurate trace of cam profile can be obtained by the method. To make the CAD/CAE/CAM integrated design of cam is reasonable.

Abstract: Accurate prediction of the order quantity for the next period is very important for the enterprise to enhance the commercial competitive advantage in a highly competitive business environment. GM(1,1) theory is one of the prediction methods that can be built with a small sample and yet has a strong ability to make short-term predictions. The objective of the paper is to propose a order quantity prediction model which is combined the improved GM(1,1) model and Markov chain model .The effectiveness of the proposed approach to the order prediction is demonstrated using real-world data from a famous company in Liuzhou.The results indicate that the method of prediction is satisfying.

Abstract: This paper focuses on the design and development of a game-based learning application for Thai Language. The main objective of this project is to encourage and support the process of learning Thai among young children who use Thai as their second language. It comes about to expose the young children to the web technology while they learn from the lessons and play the games which is the mechanism to deliver the educational content.