Advanced Materials Research Vol. 909

Abstract: Parametric equipments or standard parts usually have many different types of original design parameters. So when designing some new specifications, it requires a lot of estimation or trial and error to determine the value trends and intervals of other unknown design parameters. Based on a finite number of historical examples of design parameter groups, the paper gives an algorithm to fit value trend line using multivariate linear weighted least squares method, whose weights are designed by using distance-proximity coefficient and correlation coefficient. The algorithm uses a small amount of new design parameters, fits value trend lines of other unknown parameters, predicts all other design parameters, finally makes up a design parameter group for a new specification. Two test results of standard parts from home and abroad show that, the accuracy of value prediction is able to meet the requirements of engineering applications.

Abstract: In this paper, a analysis method is proposed on failure mode effects of facing on green CNC machining center. And the weak links of CNC machine tool were fund out on Green the reliability combining with the fuzzy evaluation and the reliability failure analysis, and its failure causes were analyzed and the corresponding improvement measures were put forward. It provides a more practical method to research the reliability and green of mechanical and electronic products. Chinese library classification number: TG659

Abstract: Measured data of hydrophone array could be interfered by underwater noise,so its essential to enhance the performance of suppressing interference for adaptive array processing. How to improve the performance of Double Stages Wiener Filter was discussed based on configuration principles. The influences of interference angle, array unit number and interference-to-noise ratio (INR) to suppressing interference have been analyzed through principle analysis and simulation experiments under different circumstances, including single or multiple disturb signals. Experiments show that the performance of suppressing interference depends on interference angle and INR more and array unit sum a little.

Abstract: With the continuous scaling of CMOS technology, reliability of nanobased electronic circuits is endlessly becoming a major concern. Due to this phenomenon, several computational approaches have been developed for the reliability assessment of modern logic integrated circuits. However, these analytical methodologies have a computational complexity that increases exponentially with the circuit dimension, making the whole reliability assessment process of large circuits becoming very time consuming and intractable. Therefore, to speed up the reliability assessment of large circuits, this paper firstly looks into the development of a programmed reliability tool. The Matlab-based tool is developed based on the generalization of Probabilistic Transfer Matrix (PTM) model as one of the existing reliability assessment approaches. Users have to provide description of the desired circuit in the form of Netlist that becomes the input to the programmed tool. For illustration purpose, in this paper, C17 has been used as the benchmark test circuit for its reliability computation. Secondly, reliability of a desired circuit does not only depend on its faulty gates, but it also depends on the maximum error threshold of these faulty gates above which no reliable computation is possible. For this purpose, the developed tool is employed again to find the exact error thresholds for faulty gates.

Abstract: Body measurement plays an important role in clothing manufacturing, especially in advanced clothing customization.^[ The purpose of this paper is not only to offer some approaches to testing the size collected, but also to make sure that the accuracy of measurements are satisfied with clothing made. In this paper, ANOVA and orthogonal experimental are seen as mathematical model to analyze the accuracy of data measured by clothing made. Three factors selected to explore this question are surveyor (factor A), proficiency of work (factor B) and characters of points related to body measurement (factor C).This model can be used to evaluate the different effects on every factor alone, and to find some factors on which have a significant influence. According to the result, both factor B and factor C have significant influence on the accuracy. The creativity in this paper is making use of orthogonal experiment and ANOVA to find and test the factors related to the accuracy.

Abstract: In order to solve the problem of uncertain cycle of water injection in the oilfield, this paper proposed a numerical method based on PCA-FNN, so that it can forecast the effective cycle of water injection. PCA is used to reduce the dimension of original data, while FNN is applied to train and test the new data. The correctness of PCA-FNN model is verified by the real injection statistics data from 116 wells of an oilfield, the result shows that the average absolute error and relative error of the test are 1.97 months and 10.75% respectively. The testing accuracy has been greatly improved by PCA-FNN model compare with the FNN which has not been processed by PCA and multiple liner regression method. Therefore, PCA-FNN method is reliable to forecast the effectiveness cycle of water injection and it can be used as an decision-making reference method for the engineers.

Abstract: The simulation technology of 3D cloud can be the ideal method to meet both making human visual scenes realistic and generating weather radar images in flight simulations. This paper describes a 3D cloud simulation method and technology that focuses in three aspects of cloud modeling, lighting and rendering. Firstly, the 3D cloud was modeled in a particle system to specify the atmosphere characteristics of cloud in natural world, then the textures were mapped to the particles to improve the cloud authentic and the lighting model was established to make the cloud environments realistic. Finally, the impostor technology was used to accelerate the rendering speed. The implementation on PC platform shows that the method and technology can generate realistic 3D cloud and the real time ability is satisfied.

Abstract: This paper describes a cloud simulation method of an airborne weather radar simulator based on the atmosphere characteristics of real clouds. With the fractal theory, an improved Successive Random Additions (SRA) to instruct cloud data modeling was chosen and an appropriate locus of control surfaces was selected. On the basis of the locus of control surfaces and the surface generated in the way of fractal this surface, weighted fusion generated a predetermined shape of the cloud data model. According to the generating rules, the data model was mapped to color values in the corresponding points, and the corresponding relation between height and color values was constructed. Finally, the screen cloud image of the airborne weather radar was drawn. The implementation shows that the method is real time and can be used to generate satisfied simulation radar image.

Abstract: Distribution networks are an essential part of all water supply systems. Distribution system costs within any water supply scheme may be equal to or greater than 60% of the entire cost of the project. The reliability of supply is much greater in the case of looped networks. The pipe networks have concentrated outflows or uniform outflow along the length of each pipe. In some pipes with variable discharge of a looped distribution network, water velocity could be reversed between its extremities. Thus, it is a water stall point denominated neutral point in which the discharge is null. In this paper a mathematical model for the determination of water stall point location in the pipes with distributed consumption is developed. This model has been implemented in a computer program for PC microsystems. Numerical example will be presented to demonstrate the accuracy and efficiency of the proposed model.

Abstract: Based on a generic LCD of HDMI interface, the aerial target simulation platform, which consists of the host terminal and display terminal, has been designed. The host terminal directly driven by S5PV210 processor is composed of TFT LCD screen, touch screen and HDMI interfaces, and the display terminal is a large-size LCD. According to the refractive index variation due to atmospheric turbulence, as well as other factors, such as height , distance and speed, the outdoor air targets can be placed in a small indoor space to simulate the flying aircraft size and shapes based on the " air targets real-time updates simulation algorithm ". Then the observer can achieve the image of the simulation on the screen through the HDMI interface by pointing the device to the target. Compared with the traditional outdoor experimental device, it has many advantages, such as easy operation, low cost and easy modification of the targets. The experimental results show that the simulator has realized the simulation of remote aircraft, which meets the needs of a variety of flying targets in different occasions.