Advanced Materials Research Vols. 328-330

Abstract: The thesis puts forward the concept of Computer Supported Technical Assistance (CSTA) for the first time. CSTA is the main form for technical assistance in the information society. The process, technical feature and advantage of CSTA as well as the primary research content and the conventional form were analyzed in the paper. In order to be seasoned with the new requirement of technical assistance, the network architecture of CSTA based on P2P was discussed.

Abstract: In order to study the influence of driving on automotive interior decorations volatile formaldehyde, the JX-3B vibration sensor calibration of sine excitation simulates car vibration. The concentration of the volatile formaldehyde is measured in the static and dynamic, combined with the indoor air quality detector and the JX-3B vibration sensor calibration. The results of experiment contrast show that the driving and stop of car has influence on decorations volatile formaldehyde. The concentration of decoration volatile formaldehyde with vibration is lower than the stationary, and concentration with the change of time also is not the same as the stationary. The experiment results of car interior decorations volatile formaldehyde can provide basis for the next research, and the reference for research of other scholars.

Abstract: On the analysis of the original data recorder, made several key problems clear when buffer and damping, distinguished between a cushion theory and application field of stress wave theory, the traditional rigid spring-buffer model whose object is to reduce the impact of acceleration that can not accurately describe the elastic force of the part of the actual situation; the stress wave theory is the elastic theory can explain the filter buffer question from the micro-small space, from this designed a composite structure for vibration reduction, which made the dynamic stress of protected component down about one order of magnitude. Optimization with Isight and Ls-dyna, the protected component's dynamic stress down about 69.3% and the data recorder's quality 300g lower, finally passed the Marshall Hammer test successfully.

Abstract: The missile launch vehicle is the launch platform of the missile, the reliability level of it directly influences the effectiveness displaying. The goal of synthetic diagnostic and health management was researched, and the framework of synthesis diagnostic and health management system of the missile launch vehicle was designed. The module designing of the system was provided according to the different subsystem, the way of system implementation was designed through the framework of the system, the principle of sensor selection was ensured in the system, the method of monitoring parameter selection was researched in a certain degree, and the key technology and research point for the system designing were analyzed.

Abstract: This paper presents a research on modeling and prediction with wavelet neural network in the nonlinear time series of gas emitted. Because accurately predicting the amount of gas emitted from the mine is a very important matter for safety, this paper proposes a new algorithm of wavelet neural network model for time series gas emission prediction. The nervous cells function is the basis of nonlinear wavelets. A wavelet network composed by the wavelet basis function is computed by an expansion and contraction factor and a translation factor to reach the global best approximation effect. Which wavelet basis function has the features of extraction capabilities, self-learning neural network and wavelet transform of the localized nature. The intrinsic defects of artificial BP neural network, e.g., its slow learning speed, difficulty to determine rationally the network structure and existence of partial minimum points, are solved. The simulation results obtained show that the new prediction system has faster convergence and more accurate prediction.

Abstract: Quantitative Feedback Theory (QFT) is a well known robust controller that deals with plant uncertainty. QFT has been applied to many industrial applications, however it never been applied to any types of grain dryer plant. Grain dryer plant prone to parameter uncertainty and needs a robust controller in order to maintain a good quality of product output. The objective of this paper is to explain step-by-step design procedure of QFT design for a continuous-flow grain dryer plant. The designed QFT-based controller is also tested and compared with PID controller via simulation. The test results showed that the QFT-based controller works better than PID controller in terms of shorter settling time and smaller percentage of overshoot for the grain dryer plant under study and at the same time insensitive to parameter changes i.e. input and output disturbances.

Abstract: For the moving small dim targets in visible image sequences with low SNR and complex background, whose contained characters are simple and poor, they are extracted difficultly. This paper proposes a new method to detect and extract positions of small dim moving targets. According to the features of moving targets, in a very short time interval, the target trajectory is considered as a straight line approximately. Firstly, it makes use of threshold segmentation methods to extract the positions of targets in each frame, then building the motion line equations after the joint of multi-frame processing results. Finally, the position of small dim targets are detected out and extracted, and false targets are eliminated accurately. Hardware system was designed and the algorithm is implemented on hardware systems successfully. The experiment results show related functions of the system and extracting algorithm is feasible, the system is stable and has a strong process ability, which can effectively detect and extract small and dim target in complex background correctly.

Abstract: In this work, on the basis of the analysis of the component of traditional data acquisition system, and in view of the design requirement of data acquisition system for the process of rotating machinery testing and fault diagnosis, adopt the integrated with AD module based on the 8th -order low pass elliptic switched-capacitor filter MAX297 for filtering, thereby proposes a portable data acquisition system. And it gives the design proposal of anti-aliasing filter according to the design requirement, and illustrates the principle of filtering and accomplished the corresponding hardware circuit. And this proposal of the filter can be used to other testing and fault diagnosis systems by adjusting the sampling frequency.

Abstract: Purpose: To discuss a setup verification method based on computer stereo vision for the repeat setup in breast cancer fractional irradiation. Methods and Materials: A photogrammetric system is composed of two cameras and one computer. First, multiple characteristic markers’ coordinates are gotten by the two cameras, then the three-dimensional coordinates of the markers are calculated according to the basic principle of binocular calculated, which can construct breast and chest surface stereo features shape, thus the setup error can judge and correct before radiation therapy. At the tracking process, we use SITF (Scale Invariant Feature Transform) as the registration algorithm, which has strong robustness and accurate matching performance, meanwhile, dynamic choice matching image and local searching strategy are used in the process of calculation and mergence in order to make the target image matching more precisely. Results: Experimental results show that in breast cancer fractional irradiation, the system can accurately display setup error and can achieve real-time calculation. Conclusion: The proposed method can reduce setup error in breast cancer fractional irradiation, and has good stability and high precision.

Abstract: The growth of serial and High Performance Computing (HPC) applications presents the challenge of porting of scientific and engineering applications. A number of key issues and trends in High Performance Computing will impact the delivery of breakthrough science and engineering in the future. ONAMA was developed to cope with increasing demands for HPC. ONAMA, which means a new beginning, is a desktop based Graphical User Interface which is developed using C and GTK. It aims to satisfy the research needs of academic institutions. ONAMA is a comprehensive package, comprising of applications covering many engineering branches. ONAMA provides tools that have a close affinity with practical simulation, thus making the learning process for students more applied. Most of the software tools and libraries are open source and supported on Linux, thereby promoting the use of open source software. It also provides tools to the researchers to solve their day-to-day as well as long term problems accurately in lesser time. The Execution Model of ONAMA serves to execute engineering and scientific applications either in sequential or in parallel on Linux computing clusters.