Advanced Materials Research Vols. 383-390

Abstract: A Decoupling method based on feedforward voltage compensation is adopted to eliminate completely the coupling between exciting current and torque current. Based on conventional design methods of single-variable linear system , the paper analyses and designs detailedly the flux loop, speed loop and current loop. A design method based on double closed-loop PI regulator for speed sensorless vector control system is proposed. Through experimental results, we demonstrate its good performance.

Abstract: The revolved surfaces are widely applied to both optical equipments and aerodynamic domain. The revolved surface is measured by digitized measurement with the coordinate measuring machine (CMM) in this paper. A CMM inspecting path planning which is different from traditional measuring method for revolved surface is given. At the same time, this method is proved effectiveness through a practical measuring example of an optical part. The Measuring process and the measuring results are illustrated in detail.

Abstract: A flux switching permanent magnet (FSPM) machine has the advantage of high power density, high torque density, inherently sinusoidal back EMF, stable structure, and the disadvantage of magnetic field uncontrollable. This paper proposes a novel axial-flux hybrid excitation flux-switching (AFHEFS) motor, which offers three phase symmetrical sinusoidal flux linkage and linearly regulated electromagnetic torque as well as excellent flux regulation capability and even field elimination ability with a size ratio of 1:2 between PM stator and electrical stator. The results are validated by 3D finite element (FE) analysis.

Abstract: This article raises an improved program of adding Pseudo-Satellite’s pseudo-range measurement and setting best configuration for Pseudo-Satellite in mentioned program on the basis of existing Binary System [1]. Through comparison and analysis of improved Tri-satellite System and existing Binary System, this article proves that it shortens location time and location precision by adding Pseudo-Satellite to Binary Navigation Location System. Finally this conclusion is approved by simulating Mathematical model using software.

Abstract: To achieve high precision contour tracking control for Permanent Magnet Linear Synchronous motor drive X-Y table, genetic algorithm was used on PID controller parameters optimized. By the ability of gene mutation, the parameters were avoided falling into local optimum point. Consequently, the global optimal value can be found directly. Variable-gain cross coupling controller was used to compensate X-Y axis coupling error. Eventually the path tracking contour error is greatly reduced to the expected accuracy limits. Theoretical analysis and simulation results show that the designed control system make X-Y table possess high contour accuracy

Abstract: As miniaturization of product becomes a trend, meso-machining technique for relevant components becomes necessary. Micro- milling with small size cutter is one of the key techniques for meso-manufacturing. When size of tool becomes small, feasible range of process parameter becomes limited. Without properly selected parameter, it could result in cost increase and quality unacceptable. Optimization of micro-milling to maximize removal rate and tool life is an important issue. This study aims at developing an optimization module using genetic algorithm for micro-milling. A milling experiment for constructing a prediction model of tool life was conducted. A computer program based on Pareto genetic algorithm was coded to search for optimized solution. A set of non-dominated solution satisfying dual objectives was obtained as the result. The solution can be used for determining milling parameter based on process interest.

Abstract: Accuracy is the key issue in the precision forging. Geometric and dimension errors are the two significant defects found in most of near net or net shape manufacturing process. It becomes more critical for complex part such as an AUV propeller blade. In this study, geometric error was quantified by comparing the blade profile obtained from nominal geometry of the blade and the profile constructed by commercial optical method namely Alicona system.

Abstract: In this paper, the relation between die roll height and V-ring position was studied by fine blanking experiments for imaginary special automobile seat recliner gear. The three die inserts and three guide plate inserts with different V-ring positions were machined, and fine blanking tool was manufactured. Using the fine blanking tool, three experiments were conducted on the 650 ton fine blanking press. Each die roll height was measured, analyzed and we found the tendency of die roll heights on imaginary special gear to increase with increasing the distance between V-ring position and contour of gear. This result can be used to minimize the die roll height of fine blanking gear parts when designing V-ring of fine blanking tool.

Abstract: A three-dimensional model of bolted single-lap composite joint was developed to investigate the influence of ply angle on failure response of joint. This model can predict the failure mode and failure load of joint with arbitrary ply angle. The property analysis of joint was performed by using the ABAQUS FE code. Failure response and degradation of material properties were implemented using a progressive model, which is incorporated in ABAQUS USDFLD subroutine. The progressive model utilizes a set of stress-based three-dimensional Hashin criteria and a set of appropriate degradation rules.

Abstract: The aim of this research was to study factors, which was influenced on surface roughness in vertical milling of hardened medium carbon steel. The specimen was medium carbon steel grade JIS S50C that was hardened at 56± 2 HRC. Full factorial experimental design was conducted by 3 factors and 3 levels (33 design) with 2 replications. Studied factors were consisted of cutting speed, feed rate, and air coolant pressure. The results revealed that influenced factor affected to surface roughness was cutting speed and feed rate which showed significantly different. Higher cutting speed would cause on better surface quality. On the other hand, poorer surface quality was produced by higher feed rate. However, factors interaction were found between cutting speed with air coolant pressure and feed rate with air coolant pressure that significantly influenced to surface roughness. The interaction of high cutting speed with high air coolant pressure would be better quality of surface finish and lower feed rate with high air coolant pressure would be better surface quality.