Applied Mechanics and Materials Vols. 541-542

Abstract: Cylinder is a common object and used in logistics industry, such as liquid container like wine. The performance of tags that are used on these objects declines, especially the read range and the radiation pattern of the tag. In this paper, a type of UHF tag antenna directly mountable on the cylinder surface. In order to reduce the impact of the deformation, the tag is designed with meander-line but not symmetrical. Antenna is combined with T-matching network to ensure good impedance matching. Compared with the basic dipole antenna tag both cylinder and plane surface, we can get the prominent feature of the tag proposed in this paper.

Abstract: The math model of cascaded H-bridge static synchronous compensators (STATCOM) of star configuration is described firstly in this paper. Based on the math model, an advanced control method is proposed, in which all control variables are dc, which are suitable for getting no steady-state errors using simple PI controllers. The simulation results demonstrate the validity of this method, and the experiment results are specially presented to verify the fast response under dynamic process.

Abstract: This paper deals with the design of arbitrary waveform generator using the Direct Digital Synthesis (DDS) technique. The key idea is the utilization of Look-up Table (LUT) supported with Code Composer Studio (CCS) platform. The synthesized arbitrary waveform is generator by storing the samples of the signal described by mathematical equation in the form of LUT in the memory of TMS320VC5416 Digital Signal Processor (DSP) and subsequently by recalling the stored samples periodically. The D/A converter generated the analog waveform. Experimental results have been included.

Abstract: The Sheet Electron Beam Vacuum Electron Device is an Attractive Choice for Generating High Power Millimeter/terahertz Wave Radiation. the Sheet Electron Beam Gun is a Key Component for the Sheet Beam Vacuum Electron Device. in this Paper, a Novel Sheet Electron Beam Gun was Proposed for a Terahertz Traveling-Wave Tube. the Theories of Sheet Beam Gun are Deduced Based on the Round Beam Gun Theories. the Track of 24.5kV, 1A, 0.4mm8mm Sheet Beam is Gained through 3D Particle-in-Cell Simulation and the Theories are Verified. the Investigation Results Show that, the Design Method of the Sheet Beam Gun is Easy and Reliable.

Abstract: In this study, we present a novel internally hybrid SSD architecture (SMARC) which consists of both SLC and MLC flash memory packages, instead of only either SLC or MLC. By periodically migrating data between the two different portions (SLC and MLC space) according to running workloads dynamics, the proposed architecture is able to exploit their respective advantages complementarily to help overall performance, reliability and energy consumption. Our simulation results of a variety of workloads have shown that SMARC can improve the performance by nearly an order of magnitude, at the same time, significantly enhancing reliability and reducing energy consumption.

Abstract: This paper presents a general model to predict resonance frequencies for long-neck cylindrical acoustic resonators. The predicted resonance frequencies by the proposed model are compared with those measured and calculated by Panton and Millers model. It is found that the model developed in this paper can give more accurate resonance frequencies for both the first and higher modes, while the Panton and Millers model can only accurately predict the first-order frequency, and up to 4% error is observed in the predicted higher-order resonance frequencies, mainly induced by the lumped-mass simplification.

Abstract: Novel four-primary displays utilizing organic light-emitting devices (OLEDs) was analyzed theoretically and experimentally. Using the fitting curves of the OLEDs electroluminescent (EL) characteristics, RGBW four-primary display is clearly shown to be more energy efficient than traditional RGB three-primary display, especially as the efficiency of the OLEDs is getting higher.

Abstract: The description of hysteresis is one of the classical problems in magnetic materials. The progress in its solution determines the reliability of modeling and the quality of design of a wide range of devices, the proposed approach has been applied to model the behavior of many samples and the results show the robustness and efficiency of Neural Network to model the phenomenon of hysteresis loop. The goal of this study is to optimize the parameters of hysteresis Loop by Preisach model with the Neural Network, the method developed is based on an analysis of two distribution functions. The modified Lorentzian function and Gaussian function have been analyzed. The implemented software and performances of the distributions are presented.

Abstract: The three-phase four-leg converter can be obtained by adding a bridge into the traditional three-phase three-leg converter. The average mathematical model of three-phase four-leg converter is described in this paper. The three-dimensional space vector PWM (3D-SVPWM) is analyzed. For simplifying the modulation, a fast digital SVPWM algorithm which eliminates coordinate transformation and saves calculating time was proposed. The feasibility of the proposed modulation technique is verified by computer simulation. These results show that the proposed fast digital 3D-SVPWM technique can be easily implemented without conventional computational burden.

Abstract: The scraper is one of the important equipment in coal mine. Because of its hard working condition, the complex force and load fluctuation and vibration during the working process, some structure failures on the axle housing of scraper took place in the coal mine. The 3D models of the axle housing were built based on the engineering prototype. The structure stress of the axle housing was calculated. The mechanical characteristics were studied for further development, which included mechanical structure, the vibration modes of the axle housing, the maximum amplitudes by modal analysis. According to the result, more attention must be paid to the stress concentration, violent and irregular vibration of the axle housing in the design.