Advanced Materials Research Vols. 308-310

Abstract: This paper briefly introduces the basic principle of threshold partition firstly, and researches an analyses the threshold partition of ant colony optimization based on otsu. The simulation results prove the rapidity and validity of the method which lays the foundation for multi-threshold value segmentation approach.

Abstract: This paper focuses on a general weight lightening method of machine tool's key moving parts based on frequency topology optimization and dimension optimization using Ansys workbench and Ansys classic interface. First, preparations of frequency topology optimization, including setting material, applying constraints and loads, meshing of the high-speed turning center HTC2550hs slide board were done in Ansys Workbench; Second, frequency topology optimization was performed in Ansys classic interface, and the preliminary light weighted model of the slide board was obtained; then, for important parameters of the removal parts that affect slide board's dynamic performance much, dimension optimization was performed. Finally, we achieve that the slide board's weight is reduced by 11.03%, while its first and second natural frequencies are increased.

Abstract: Cracks were occurred in welding lines at An Aero engine fuel - oil heat exchanger and oil spills were caused. But shortly, after welding cracks, cracks emerged again and severely threat to flight safety. To improve the overall damping by using new developed shock absorber, and alter the distribution and peak of stress at dangerous parts to prevent cracks by using a prevention program which consisting of two measures: vibration damping and partial damping treatment at the cracks particle which are prone to dangerous parts, were proposed in this paper and for analyze the damping effect, vibration test and compared were used. The results show that the prevention program can effect reduce the peak of stress at the risk of cracks particle which are prone to dangerous parts, and it is certain significant for how to repair and prevent the weld cracks at fuel - oil heat exchanger.

Abstract: The spraying efficiency can be greatly improved by using pipeline spraying in larger orchard, meanwhile, labor strength could be reduced greatly and the pest control efficacy could be improved. Adopting constant pressure control devices can improve the stability of liquid pressure in pipeline, reduce the liquid pressure fluctuation which caused by the changing of spraying nozzles number. The spraying experimentations were carried in orchard by using constant pressure controller. Experimental result indicated that, using the constant pressure control device, the control error was 0.0167Mpa, the pressure control stability was 98.33%, the downtime to prevent pipeline bursting was 8.04s and the downtime after pipeline burst accidently was 8.88s. Using constant pressure controlling, stability of liquids pressure in the pipeline could be guarantee and pipeline bursting could be prevented at the same time.

Abstract: The mathematical development of structural topology optimization provides a mature tool for design optimization, although the application is still very limited in engineering practice. This paper intends to study the application of topology optimization in industrial design via commercial CAD software interfaces. An innovative numerical procedure for this purpose is introduced based on convenient CAD modeling interfaces. As an instance, the B-spline based environment Rhinoceros3D features the modeling module for the optimization procedure, in collaboration with an additional optimization engine BESO3D. The topology optimization is realized based on the CAD model from Rhinoceros and outputs the optimal solution into Rhinoceros after computation. Further interpretation of the optimization results is discussed within the framework of Rhinoceros. Design applications of the modeling-optimization design integration are showcased as the examples to demonstrate the efficiency and robustness of topology optimization in industrial design.

Abstract: This paper reviews the research of narrow-gap TIG welding. It contains narrow-gap welding with double arcs, narrow-gap welding with double wires, compounded narrow-gap welding, TIG welding under controlled magnetic arc and ultra-narrow-gap welding. It analyzes the merits and drawbacks of every manner in narrow-gap welding. Considering the little groove angle and small gap, how to make sure sidewall fusion, the improvement of fusion welding forming and the prevention of weld crack are focal points of narrow-gap welding researches. The further development of electrical and visual sensors can lower the precision of work piece assembling and solve the central location problem of electrode. Narrow-gap welding will have a good application foreground.

Abstract: Effect of substrate conditions, including material type, thickness and radius of substrate, on residual thermal stresses of plasma spraying Sm2Zr2O7/YSZ TBCs was analyzed through finite element method in this paper. The radial and shear stresses of the coating decrease with increasing of distance from the center to edge, and they decrease abruptly at the edge of the specimen, while the axial residal stress increase abruptly at the edge of substrate. All residual stresses increase with increasing of thermal expansion coefficient of substrate. The thickness of substrate has slight effect on the radial residual stress, axial residual stress and shear stress are almost uneffected by substrate thickness. The optimum thickness of substrate is 10mm. Radius of substrate have no effect on radial stress when it is greater than 28mm.

Abstract: The communication module was designed based on DeviceNet bus technology in this paper, which had the circuit-breaker used in the DeviceNet. So the intelligence of circuit-breaker was improved. Firstly applied PIC18F458 single chip as control chip in hardware design and proposed the power source, dial switch and LED interface circuit design scheme based on DeviceNet protocol specification. Secondly proposed the soft design scheme, included established module and I/O information communication. At last SST-DN3-PCU-1 main station card was 阿applied as network analyzer to analyze the communication data detail.

Abstract: Based on the characteristics of steel structure of the furnace, a generic finite element model, automatic loading, analysis and post-processing was achieved by ANSYS-APDL firstly. Then taking the sizes of profile as design variables and total mass as objective function, the size optimization design on steel structure was developed by means of two-level algorithm based on discrete variable.

Abstract: In order to evaluate a RMS roundly and objectively, a multi-level fuzzy comprehensive evaluation approach based on analytic hierarchy process (AHP) is proposed in this paper. Firstly, a hierarchical and comprehensive evaluation index system for RMSs is extracted. Then, based on this structure, a multi-level fuzzy comprehensive evaluation model is developed, in which AHP is incorporated to determine factor weights.