Advanced Materials Research Vols. 482-484

Abstract: Abstract：This paper analyses characteristics of single-phase ground fault in distribution system. Now, most of the line selection methods have some limitations, which leads to the low accuracy of the fault line selection. In order to solve above problems, make use of the matlab software in this article to simulate and analyze the isolated neutral system and resonance neutral earthing system when they occur single-phase ground fault. Finally, the new method based on first half wave method and increment of residual current to improve the accuracy of fault line selection is proposed.

Abstract: The Ce(III) extraction kinetics with di-(2-ethylhexyl)phosphoric acid (D2EHPA) in the presence of a complexing agent acetic acid(HAc) has been investigated using constant interfacial cell with laminar flow. The kinetics mechanism and extraction rate equation were achieved by the studies on the effect of stirring rate, temperature and specific interfacial area on the rate of extraction. The effect of temperature on the kinetics was analyzed, the value of the apparent activation energy was calculated as 11.96 kJ/mol, and it was found that the extraction process was a diffusion-controlled kinetics regime.

Abstract: Online monitoring of welding process has become necessary as the use of laser welding increases. In laser welding the molten pool width is one of the most important quality aspects. Metal plume and spatters are measured and used as signals for predicting the molten pool width. In this work, BP neural network model is established. The effectiveness of the model is demonstrated, the results show good agreements with corresponding experimental data.

Abstract: Standard programmable logic controller (PLC) based proportional-integral-derivative (PID) was originally employed as part of the food production line control strategy, but after observing the response of those process due to measured disturbances during normal operation, it was evident that PID control could not meet the desired cooking specifications. It was decided to pursue advanced process control strategies as a means to meet the food production specifications. The problem of this research study was to design and analyze the performance of a PLC-based model state feedback controller implementation for an industrial food production line, and to determine its viability in comparison to commercially available PC-based model predictive controller implementations applied to food production line.

Abstract: Eleven genomic islands (GIs) flanked by isocitrate dehydrogenase genes are determined in Escherichia coli and Salmonella enterica. These GIs have at least one mobile gene, such as integrase gene, transposase gene or recombinase gene. Through annotation of internal genes, these GIs are related to lambda prophage. The excisionase gene is associated with the mobile gene in some GIs. An ABC transporter, namely, sitABCD operon, is existed in some GIs and may uptake Fe2+ and Mn2+. Mn2+ is a second cofactor and an essential activator of the isocitrate dehydrogenase. The cleavage site of functional lambda integrase is 5’-TGCTGCGCCA-3’ in direct repeats at 3’-end of icd gene.The truncated lambda integrases (ECP_1132 and ECP_1135) are inactive because the transposon inserted the integrase gene by 5’-CCTGG-3’. This Fe2+/Mn2+ transport operon is predicted that is a recent product of horizontal gene transfer in E. coli because this operon is also existed in S. enterica and is not in a mobile GIs.

Abstract: Previous studies on the amplitude horn only calculated sizes in consistent with the axial resonant mode frequency and disc bending resonant mode frequency without considering the overall stress and the amplitude of the disc’s outer ring. The resonant frequency of the amplitude horn cannot occur around 35 kHz. Such a design results in the inability to weld and may damage solar panels or lead to poor welding quality. Using the optimization method to address these problems, the proposed design process in this study is to conduct sensitivity analysis by the gradient method to understand the impact of design variables on the objective function for the selection of design variables. Then, this study applied the random search method to find out the feasible design of arrays to optimize the structure of two arrays closest to the design objective by the full factorial experiment method to ensure to get the global optimal solution rather than the local optimal solution. Finally, by design examples, this study used the sub-problem approximation method to search the optimized solution and compared the differences of the two methods, in order to confirm whether the objective of optimized design of amplitude horn had been achieved.

Abstract: To avoid premature and sensitivity of operator parameters selecting of Standard genetic algorithm (SGA) and simulated annealing genetic algorithm (SAGA), a parallel hybrid genetic algorithm based on multi-group (hybrid GA) is presented. The algorithm combines the ideas of parallel computation, simulated annealing and genetic algorithm, and uses orthogonal test table selecting operator parameters to improve the efficiency and robust of the algorithm. And benchmark example of job shop scheduling problem (JSP) is used to validate the effectiveness of the algorithm. Results show the hybrid genetic algorithm converges quickly with small impact to operator parameters.

Abstract: Chatter is the most obscuring phenomenon and significant amount of research has been documented regarding prediction, control and elimination of chatter. The present study has been undertaken in order to investigate the effects of multilevel dynamics in the dynamic stability prediction of deep end milling of the flexible parts. In the course of development of stability lobes diagram (SLD), input parameter of structure dynamics plays a vital role on the precision of SLD. In the present study CutPro is used to develop SLD for deep end milling of flexible workpiece after considering two cases of frequency response function (FRF) identification of flexible workpiece. It is shown that for deep end milling of flexible workpiece it is not enough to just identify the FRF of the workpiece only at one free end of the workpiece. To develop the exact and precise SLD it is necessary to identify the FRF of the flexible workpiece at more than one point along the axial depth depending upon how deep the workpiece is being milled.

Abstract: Assuming that a process is subject to the normal distribution when calculating the process capability index traditionally. A main flaw lies in the process capability index is very sensitive to such changes if normal hypothesis was not satisfied. In order to obtain accurate process capability index of quality characteristics under this circumstance, this paper adopts Rosenblatt transformation to compare with Box-Cox transformation and Johnson transformation with type 6110 Connecting Rod Bush radius as an example, the results show that Rosenblatt transformation proposed performs better and implement is simple.

Abstract: This paper presents an overall framework of the machining process monitoring system based on virtual manufacturing and does research on its key technology and validates the system with a engraving machine tool. By using of tabletop virtual reality platform Quest 3D, a virtual environment of the machine tool has been created and the machining simulation combined with VC++ has been realized. It has been proved that the simulation and the actual processing interface of monitoring interface are consistent, and the effect is very good. What's more, Using the network module of the virtual reality platform Quest 3D and the additional functions of the database operation, the communications among the machine tools, the server and the client is finished and the manufacturing process monitoring system based on virtual manufacturing is also realized.