Advanced Materials Research Vols. 433-440

Abstract: The enterprises of China have known lean production for nearly 30 years. With the growth of its application scope, it is necessary to put forward one method to measure lean production’s implementation ability. Because without scientific measurement, enterprises can’t find the existing problems or waste sources, so it is hard for them to realize continuous improvement. Under this background, this paper applies fuzzy theory into LP’s implementation ability appraisal. Meanwhile considering the flaws of fuzzy theory, one improved model is put forward. After relative introduction to the improved model, one case is displayed. Through this example, this paper shows the calculation procedure of this model as well as its scientific, reasonability.

Abstract: Corporation with others enterprises is very important for their development, especially for Small and Mid-sized Enterprises. This paper discussed management methods among Small and Mid-sized Enterprises with synergetic thinking, based on the state of these enterprises and cluster supply chain, which provided a theoretical support for the development of small and mid-sized enterprises in China. Synergetic management in the inner unit and outer unit of cluster supply chain is described. The key safeguards to development of cluster supply chain are summarized at the end of this paper.

Abstract: Material cost decrease is an important issue for industrial factories. Operations Research is considered as a proper means for this purpose. A steel production company as a case study is presented in this paper. The combination of raw material is important in steel production. In the company raw materials are mixed experimentally without attention to cost minimization. After considering the process of steel production, a mix model is determined as a proper model for lowering the cost of production in the company. At first, we study the mix problem. Then, we deal with the quantities of the model parameters as well as a mathematical modeling based on the proper constraints. Finally, the solution to the mathematical model is created by a software .The model solution shows that the proposed optimal solution leads to cost minimization significantly.

Abstract: According to the law of rigid body around fixed axis rotation, established the mathematical model of motor drive current and instantaneous rotational speed. From the ideal situation of the simulation, according to the same discrete interval of time equal to the same increment of spindle angular velocity conditions, established the discrete closed-loop control system model. In allusion to the disadvantage of calculating corresponding braking current by the instantaneous speed and the instantaneous braking torque measured during the last interval, proposed the control method of calculating braking current by the instantaneous speed and the instantaneous braking torque measured all discrete intervals before current time. Discussed emphatically the computer controlled method based on the discrete closed-loop and phase-locked loop theory which can be used to design the braking current. Evaluated the advantages and disadvantages of the model, and proposed the improved direction.

Abstract: This article from the vehicle space requirements and the overall layout of the basic requirements of ergonomics; with shift control mechanism and the spatial relationship between the car-related parts, the first shift control mechanism for the conceptual design. Then, according to Japanese standard vehicle shift control mechanism on the space size requirements, the use of EDS UG Software Company’s shift control mechanism of the structure and size of the detailed design and three-dimensional solid modeling. Finally, the shift control mechanism UG software for assembly and constraints, the use of MSC's ADAMS, the kinematic simulation and analysis. This article describes a shift control mechanism of the design and verification to provide some reference, and fill in the shift control mechanism before the national performance and test the research gaps.

Abstract: An finite element model (FEM) of multistory steel frame structure is established by applying ANSYS parametric design language(APDL) in this paper, where the objective function of optimization is defined as the minimum volume of a Pin framework. The optimal design are carried on by applying the optimized toolbox of ANSYS, based on analysis the situation of the most disadvantageous load combination. Several approaches have been proposed to avoid restraining to the local minimum. Experimental results show that the section size of the structural element improved obviously.

Abstract: In here, a robust optimization mathematical model of the cylindrical helical compression spring is presented. To minimize the error and maximal variations of spring stiffness coefficient related with structure parameters and its tolerances is chosen as its objective function, and the acceptable region is formed by some constraints. The theory is applied to the structure design of the breaking spring of spring actuator, the breaking characteristics are all satisfied at the optimum structure parameters, and the optimization results are discussed.

Abstract: Swage autofrettage is one of the methods used for increasing life time of tubes and thick wall cylinders under the dynamic loading condition. In this paper swage autofrettage process of thick walled tubes are simulated using ABAQUS commercial code and effect of tool design on the residual stress distribution are investigated. For validating numerical results some experiments were performed and results of experimental and numerical methods showed good agreement with each others.

Abstract: Competition dynamically pushes manufacturing ahead. Consequently, design capabilities identified as strategic weapon that offers tremendous opportunities. However, design capabilities development is a stringent challenge to an organization especially in high technology base like automotive. In Malaysia, especially vendors has limited capabilities consequently bound the development steps. There are numerous critical success factors (CSFs) involved in developing successful design capabilities. Thus, makes the development process more complicated. All important CSFs have to be determined and rank accordingly. The CSFs are then applied in a model, using multi criteria decision making approach to facilitate the development process.

Abstract: In order to obtain the influences of process parameters on double-roller clamping spinning (DRCS) process, the finite element (FE) numerical simulation is performed. Firstly, on the basis of nonlinear FE analysis software ABAQUS/Explicit, the FE model for the DRCS process is established. Secondly, the reliability of the FE model is verified by the experiment results. Finally, using the verified FE model, influences of roller feed rate, initial wall thickness and contact length on the spinning moment, maximum wall thickness difference and flange difference of the DRCS process are studied. The results show that when roller feed rate increases, both the spinning moment and flange difference will increase, however, the maximum wall thickness difference will decrease. And the increase of initial wall thickness can cause all the spinning moment, the maximum wall thickness difference and the flange difference to increase. Furthermore, the increase of contact length can cause all the flange width, maximum wall thickness difference and spinning moment to increase, as well as the increase of the difference between the flange width and the contact length. In addition, it is concluded that the flange width has a maximum value for the definite blank. The results can provide the theoretical basis for determining the process parameters of DRCS.