Applied Mechanics and Materials Vols. 128-129

Abstract: Based on the functions and performance analysis of networked virtual instrument (NVI) system, this paper design and implementation the software system of a NVI with the .NET platform. And carry out an in-depth analysis of the software system, especially the key techniques including databases, DataSocket and multithreading. The system uses ASP.NET, C# for development server pages, the instrument operation instructions embedded in Web pages using ActiveX techniques. Using VC to development VI server applications, and through DataSocket to transfer testing data. The testing results show that the software system is operating well, the NVI system achieves a convenient user and testing resource management, and making the system more users to share testing equipment to improve efficiency.

Abstract: This paper takes automobile panel as the study object, and adopts non-contact 3-D scanner to obtain the point cloud data of the automobile panel for point cloud data sampling and noise reduction processing. It obtains NURBS surface fitting through detecting of curvature and grid. Reverse design can improve the product prototype in a fast speed and provide an important way of automobile panel development.

Abstract: For the automobile stamping parts quality inspection problem, this paper discusses the advantages and disadvantages of the contact measurement method and non-contact measurement method. It adopts non-contact photography-type scanner to obtain stamping parts point cloud, and compares and analyzes the automobile stamping parts point cloud and digital model based on ‘Geomagic-qualify’ software. In order to obtain accurate comparison result, it adopts alignment methods like benchmark feature surface, best fit, and RPS, etc. and finds out that RPS alignment method can obtain the values that are mostly approximate to the practically measured values.

Abstract: Using visco-elastoplastic-plastic finite element method, the resistant ability to rutting occurring in Heilongjiang province express way has been analyzed. Base on the numerical results, it has been found that the location of rutting occurring mainly existed in middle course, So some modified measurement of middle course to enhance the resistant rutting ability has been proposed. At the same time, A new user Subroutine, which is named dload of ABAQUS, has been employed to simulate the moving vehicle load ,this article has proposed a new method to predict rutting behavior .

Abstract: Building upon our previous work for automatically creating colorful patterns with planar symmetries, we study mapping these symmetric patterns into fascinating limit images having evolving symmetry from dynamical systems. The method can be used to automatically generate a great variety of artistic patterns.

Abstract: Non-stationary trend in R-R interval series is suggested to be removed to obtain reliable results for it could highly influence the frequency domain analysis of heart rate variability. In this study, three detrending methods, the smoothness prior approach, the wavelet and the empirical mode decomposition, were compared on artificial R-R interval series with four types of simulated trends. The Lomb-Scargle periodogram was used for frequency domain analysis. Results indicated that the wavelet method showed a better overall performance than the other two methods, and more time-saving, too. Thus the wavelet method is recommended as an optimal choice for use.

Abstract: Aiming at those problems faced by armored force which carried out real communication countermeasure training under complex electromagnetic environment, a simulation system was developed. Based on the analysis about threats faced by armored communication and the process of armored communication countermeasure, the system function and the federation member structure were designed, and the system was realized in the end by the distributed simulation technology of HLA. This system showed good performance of scalability and reusability, so it is suitable for the training of armored force.

Abstract: A DC/DC voltage booster circuit is essential to design for the high-pressure (H.P.) injector driving circuit since the power supply voltages for various H.P. injectors are DC 60~90 V rather than DC 12~14V battery voltages. The DC 12~14V battery voltages have to be boosted up to the stable DC 60~90 V voltages supply for being able to drive various H.P. injectors. The new H.P. injector driving circuit consists of a voltage booster circuit and an originally designed three-stage power MOSFETs injector driving circuit to control the dc-link power supply voltage. The dynamic performance of a H.P. injector driven by the designed electrical driving circuit with the voltage booster are simulated and analyzed. The stability and electrical characteristics for the voltage booster under various injection pulse durations and engine speeds are investigated. The fuel injection quantities, supply voltages and injector driving currents of the H.P. injector fed by the new injector driving circuit is illustrated and analyzed in the paper. The experimental results show that this injector driving circuit with a newly designed voltage booster is capable of operating stably to drive the H.P. injector and obtain the accurate fuel injection quantities in the air-fuel ratio control of engines.

Abstract: An ASIC front-end design of intra and inter prediction module based on H.264/SVC standard is proposed in this paper. State machine is used in intra prediction module for timing control. A branch reusable unit ADDR3221 is constructed and optimized to implement the intra prediction in RTL-level. In inter prediction module, the three-level MUX is used to realize the level control from the frame-level to block-level. According to the different segmentation of luma and chroma, the computation of the motion vector and interpolation is realized. Simulation and optimization are performed on the EDA tool of Synopsys platform. Experimental results show that the design of the H.264/SVC forecast module fulfills functional integrity, and the power and the area meet the requirement of design constraint.

Abstract: The traditional muzzle angle measurement method measured by optical range quadrant can’t satisfy the demand. A muzzle angle auto-measurement method based on collimation light source and PSD two-dimension sensors is provided. Adopted by the auto-measurement technology, the precision, efficiency and velocity of measurement are all improved, which solves the problems of traditional methods. The errors and precision of the new system are analyzed. According these analysis and calculation, the precision of this measurement system can gain the measurement ends.