Advanced Materials Research Vol. 950

Abstract: An industrial application of single point incremental forming (SPIF) process is dramatically increasing due to the flexibility and economically of the SPIF process. In this paper, the maximum wall’s incline angle without tearing of the SS400 steel formed sample was investigated as the SPIF formability. The SS400 steel sheet 0.8 mm thickness was formed into the 100 mm diameter cone shape with 90^o, 75^o and 60^o wall’s incline angle. The forming depth was progressed step by step until the cone wall surface fracture was occurred, then the experimental was stopped. The experimental result shown the formability limited of the SS400 steel sheet was approx. 60^o wall’s incline angle. This could be used as the initial utilized data in designing the single point incremental forming parts.

Abstract: The incremental forming process was investigated in this research for sheet metal. With this technique, it appeared in different surface roughness. This research studied a titanium grade 2 sheet, which is formed by incremental forming process with varied factors in the experimental design for Full Factorial Design 2-level for consideration of three factors determining the surface roughness. It was found that the factors of main effects to surface roughness were spindle speed and overlap. However, the depth did not affect directly on the surface roughness.

Abstract: The laparoscopic instruments cause pain, numbness and damages to surgeons during the operation due to poor ergonomic design. Anthropometry is one of the most important factors in ergonomic design. Six hand dimensions have been measured in gripping position of fourteen subjects. A prototype handle was designed based on those anthropometric data and finally manufactured. In this study, surface EMG and angels of wrist during a simulated laparoscopic task were collected to evaluate the usability of the new designed and an available handle. After the task, a questionnaire was used to assess the comfort level of those handles subjectively. The compare of those physiological signals showed that the prototype was superior in ergonomic design. Regarding to the questionnaire, the prototype handle scored 58.08, and the current handle scored 52.22. The results showed that the prototype handle is more ergonomic designed than the current handle.

Abstract: A flow integrating instrument based on the diaphragm gas meter is designed with MSP430 microprocessor. The double reed switch is used for the flow signal acquisition with higher Accuracy. In order to reduce the influence of pressure and temperature on gas flow measurement, the PT1000 resistance temperature sensor and silicon piezo-resistive pressure sensor circuit are designed. The embedded software is developed with C. The experimental result show the flow integrating instrument has high accuracy.

Abstract: This paper addresses the observer design for simultaneously estimating the state and input of a class of impulsive systems whose nonlinear terms satisfy an incremental quadratic constraint. By employing Lyapunov theory, sufficient conditions for asymptotical and exponential estimation convergence are derived. Gain matrices of the proposed observer can be obtained by solving linear matrix inequalities (LMIs).

Abstract: Natural disasters like icing have a strong impact on the power transmission line which is the foundation of safety and stability operation for power system. In this paper, an online transmission line monitoring and patrol system based on Wireless Sensor Network (WSN) and Ethernet Passive Network (EPON) is firstly designed and a model is built to analyze the latency influenced by the number of towers using EPON communication technology which is solved by Lingo 11.

Abstract: FPGA is one kind of important devices that can realize many functions. As the development of communication technology and computer science, more and more technologies are invented and more and more hardware design technologies are sifted out. Therefore, the hardware design based on ASIC can be not fit on the new theories realization. As a new device, FPGA has many advantages including strength function, shorter design circle, less money, more flexible and more intelligent design tools. More and More hardware designs of FPGA are pay more attentions. Therefore, it is significant to make analysis on hardware design of FPGA. The hardware design for FPGA will be related to the FPGA device. In the market Altera and Xilinx FPGAs are used frequently by engineers. Therefore, in this dissertation will be make analysis and realization the critical points in hardware design based on Xilinx FPGA. In this dissertation, the critical point of Hardware Design of FPGA will be described. It will include power source, impedance matching and clock circuit design. There are many hardware design tools used for hardware design including Altium Designer, Protel, Cadence and others. Compared with other design tools, Cadence will have more advantages. Therefore, in this dissertation, Cadence will be used as the design tool for hardware design analysis and realization. With the help of Cadence, one hardware design and signal transmission simulation will be made analysis. With the development of the micro-electronics technology and computer science, the hardware design about FPGA will be taken more and more attentions.

Abstract: This study proposes a novel suface reconstruction method. Surface reconstruction based on Support Vector Machine (SVM) is a hot topic in the field of 3D surface construction. But it is difficult to apply this method to noisy cloud points and its running time is very long. In this paper, firstly, Fuzzy c-means (FCM) is used to delete the large-scale noise, and then a feature-preserved non-uniform simplification method for cloud points is presented, which simplifies the data set to remove the redundancy while keeping down the features of the model. Finally, the surface is reconstructed from the simplified data using SVM. Both theoretical analysis and experimental results show that after the simplification, the performance of method for surface reconstruction based on SVM is improved greatly as well as the details of the surface are preserved well.

Abstract: Surface reconstruction is a hot topic in the field of computer graphics. Power Crust algorithm can reconstruct a triangle mesh that is topologically valid and convergent to the original surface. But it can not handle the points with noised and its running time is long. In this paper an efficient surface reconstruction algorithm for noisy samples is proposed. Firstly, we delete the noise by bilateral filter. Secondly, a non-uniformly sampling method is used to resample the input data in order decrease the number of the samples to the local feature size before reconstruction. Finally, Power crust algorithm is be used to reconstructed the surface. From the experiments, it can be seen the speed of reconstruction is increased and the features of the surface are preserved.

Abstract: Organic solar cells as a new photoelectric conversion device have great potentiality, and it has attracted more and more attention. This paper briefly reviews operating principle, structure and classification of organic solar cells, and analyzes some factors affecting photoelectric conversion efficiency of organic solar cells, finally prospects the broad prospects of development of organic solar cells.