Advanced Materials Research Vols. 308-310

Abstract: In order to improve the human engineering characteristics of the table tennis wheelchair and promote sport wheelchair, the design of a Table Tennis wheelchair was improved based on the human engineering. With the PRO/E software the table tennis wheelchair three-dimensional model is built and with the CATIA software the three-dimensional human body model is established. At last, in order to validate the human engineering performance of the improved table tennis wheelchair, we carried on the wheelchair man-machine engineering simulation, the operating space analysis of containing, balance analysis and body posture comfort level analysis and appraisal. The results indicated that the improved table tennis wheelchair can satisfy the human engineering request of the security, the efficiency and the comfort.

Abstract: To speed up the virtual development of the automobile, Using VC++6.0 programming environment and the function of ADAMS could execute the batch files; the simulation and analysis of automotive system are developed. A friendly convenient and the flexible man-machine conversation interface are developed by VC++ foreground. The parameters input by users and ADAMS operating commands are encapsulated in acar.cmd file. ADAMS will automatically calculate and simulate after executing the acar.cmd file. It can be showed that this program will improve the study and quicken the design of vehicle progress greatly.

Abstract: In view of the influence of the periodic vibration to the structure of disc vibration dryer, This article analyzes the mode of vibration system of the dryer by using FEA software ANSYS, extracts the first ten order modes and gets the dynamic characteristics on the modes. The analysis of the modes and the characteristics can provide basis for the improvement of this kind of dryer.

Abstract: This paper studies the analysis technique for complex antenna structures considering non-probabilistic uncertainty parameters. A method, which combines the interval matrix perturbation algorithm with the interval truncation algorithm, is proposed to analyze the distorted interval information for complex structures. Through the analysis of relative uncertainty of interval parameters, the criterion to determine the interval truncation factor is obtained. Two numerical examples, including a truss structure and a complex reflector antenna structure, show that the method is rational and feasible.

Abstract: This paper combines a derivative-free hybrid optimization algorithm, generalize pattern search (GPS), with Treed Gaussian Processes (TGP) to create a new hybrid optimization algorithm. The goal is to use the method for top design of satellite system, in which the objective or constraint functions usually are computationally expensive black-box functions. TGP model partitions the design space into disjoint regions, and employs independent Gaussian Processes (GP) in each partition to represent the time consumption of true problem responses. Utilizing the TGP, we generate the new “promising” points, which are the combination of model-predicted values and estimated model errors. Then, these points are used to guide GPS search in the design space efficiently. The hybrid optimization method is applied to top design of multi-satellites cooperated observation. The results demonstrate that the proposed method can not only increase the chance of obtaining optimal solution but also cut down the cost of function evaluations.

Abstract: In order to analyze the influence on the printing graphics from the deformation of the printing cylinders and blankets, in this paper, offset printing unit was as the research object, the three-dimensional assembly model of printing cylinders was established by using SolidWorks , the model was imported into finite element software ANSYS, by using ANSYS nonlinear contact calculated functionality, the face-to-face contact of impression surface between plate cylinder and blanket cylinder, blanket cylinder and impression cylinder were established, the stress and strain distribution of blanket were obtained, and the elongation value of circumferential and radial direction of blanket were got, the dot enlargement value was received by simulation analysis.

Abstract: This paper introduces a module using the RGB-based LED design to improve the thermal management of a mixied white light LED and describes a system for heat dissipation in illuminated, high-power LED arrays. Mixed light LEDs can be produced by combining appropriate amounts of light from the red, green and blue LEDs in an array. A LED cooling system, using a micro- tube water-cooling device, was fabricated. Recycling water in the system, gave more efficient convection and the heat created by the LEDs was easily removed, in the experiments. It was shown that micro-tube water-cooling systems rendered an improvement in thermal management that effectively decreases the thermal resistance and provides very good thermal dissipation. Furthermore, the results of experiment and simulation demonstrated that a micro-tube water-cooling system is very effective in heat dissipation in LEDs and the fabrication of practical micro-water tube cooling devices for mixing light LEDs was feasible and useful

Abstract: In multimodal optimization, the original differential evolution algorithm is easy to duplicate and miss points of the optimal value. To solve this problem, a modified differential evolution algorithm, called niche differential evolution (NDE), is proposed. In the algorithm, the basic differential evolution algorithm is improved based on the niche technology. The rationality to construct the proposed algorithm is discussed. Shubert function, a representative multimodal optimization problem is used to verify the algorithm. The results show that the proposed algorithm can find all global optimum points quickly without strict request for parameters, so it is a good approach to find all global optimum points for multimodal functions.

Abstract: To solve the problems of engine simulation process faced, the framework of simulation management platform of digital engine based on MSC.SimManager was put forward. The characteristics and functions of simulation management software named SimManager were mentioned. The portal design process and function and management objects of this platform were discussed, which included rights management, project management, simulation of process management, data management, and so on. The result of this study would be provided for the further application of the simulation platform.

Abstract: The forming limit diagram of magnesium alloy ZK60 was developed with Hill’s instability criterion and M-K analysis. The relationship of forming limit with stain path, temperature and the thickness irregular coefficient were analyzed. The results show that the forming limit of ZK60 magnesium alloy increased little with the rising of strain ratio, but influenced greatly by the failure definition , and forming limit of is increased with the rising of temperature and thickness irregular coefficient, the most suitable value of f0 is 0.99, the fracture occur on the grain boundaries with significant cavities formation.