Applied Mechanics and Materials Vols. 716-717

Abstract: Halcon is a machine vision software. It can process all kinds of image processing problem. In this paper, Halcon is used to process moving targets detection, from which it can be seen how the software Halcon is used to process digital image. The algorithm includes region_ growing algorithm, image filtering and morphological operators, etc. The software Halcon can be used in digital signal, too. In the end, it is used to process pulse signal. The result shows that Halcon has powerful functions in digital data processing.

Abstract: Because the affine transformation can realize the coordinate translation, rotation, scaling, it is applied to calibrate the touch screen. But,requirements for touch errors of Windows 8 is ±0.5mm,and the pass rate of sample point must reach 4%.Therefore, simply use the method of draw-point to collect the sample point has been unable to meet the requirement of accuracy. This paper tries to propose two improved calibration algorithm based on affine transform, one method use drawing lines instead of marking point, the other devides the screen into a plurality of areas to use multiple calibration. This two kind of methods can effectively improve the calibration precision.

Abstract: The chaotic characteristics of high-dimensional chaotic system are more complex, so the design of chaotic system with higher dimension has become a leading subject of chaos theory. In this paper, we constructed a nine-dimensional eight-order chaotic system. Matlab simulation of system is performed and Lyapunov exponents are figured out, which proved more complex dynamical behaviors. And the corresponding hardware circuit is designed. Multisim simulation results of the circuit coincide with Matlab simulation of the system completely, showing the same chaotic attractors. The consistent results verified the realizability of system. Therefore, the system can provide a more secure encryption source for information encryption.

Abstract: To overcome the shortcomings of realizing chaotic system by analog circuits, digital chaotic signal generation circuits based on DSP are designed. Computer simulation of chaotic system is performed firstly, and the discrete equations are obtained using discretization algorithm. On this basis, the design of hardware circuits based on DSP is made, and the corresponding C programs are constructed. Through the debugging of software and hardware, digital design of chaotic system based on DSP is achieved, and chaotic attractor is observed through an oscilloscope by digital-to-analog conversion circuit. The experimental results coincide with the simulation, proving the correctness of the design. The chaotic signal generation circuits can provide rich digital chaotic signals sources for the application of chaotic systems in engineering.

Abstract: In this paper, a fuel cell power system is considered to supply DC power for a Peltier based cooling process. For the fuel cell, there exist slow dynamic response and soft characteristic due to long-running. Therefore, the fuel cell hybrid power system is designed, including fuel cell, battery, unidirectional DC-DC converter and bidirectional DC-DC converter. In order to reduce the slow dynamic response and soft characteristic, it is the most important that the bidirectional DC-DC converter is controlled for charging or discharging to the battery. A control scheme combined feedforward and feedback is proposed for the bidirectional DC-DC converter, where feedforward control is based on the output voltage of the fuel cell. Simulation results based on the designed circuit and proposed method are given to verify the performance of the converter.

Abstract: Frequency locking of resonator gyro (R-FOG) is a key technology in gyro signal detection, the frequency locking stability determines the performance of the gyro. Based on transmission theory of ring resonator, this paper analyzes the resonant characteristics, builds the R-FOG system, realizes the output of resonance spectral line first harmonic by using sine wave phase modulation and demodulation technology. According to the source of circuit drift error in the traditional analogue proportion integral (PI), the T-type feedback network which can effectively inhibit the drift error was proposed and applied to the frequency locking of resonator gyro, which obtained better effect. By Allan variance analysis, the locking stability of resonant frequency for 4000s is better than 9×10^-12.

Abstract: This thesis introduces some disadvantages of the electricity inspection tools at present, and proposes some new solutions and an electricity inspection tool in view of the above shortcomings and the insufficiency. The name of this electricity inspection tool is Multi-functional portable field electric check terminal. This electricity inspection terminal has many advantages and makes up for the insufficiency, solves some electricity inspection problems at present. The paper introduces in detail the hardware composition of Multi-functional portable field electric check terminal and working principle and working process.

Abstract: Environmental data transferring method based on cell network is featured with good signal coverage, reliability and without network development, therefore, this method has a large application value and prospect. In order to satisfy the demand of long distance, wirelessly environmental parameters sensing, an environmental parameters sensing system based on SMS (Short Message Service) module is developed. The system can measure environmental parameters, and send them by SMS. And also, this system can connect with PC (Personal Computer) as a remote environmental parameters acquiring terminal. Experiment results show that, the environmental parameters sensing system fulfill sensing environmental parameters and sending by SMS successfully.

Abstract: The decoupled control of active and reactive power in doubly fed induction generator (DFIG) is a key technology of wind power generation system. First, this paper introduces the principle of DFIG, then proposes an useful method for decoupling control of active and reactive power by analyzing the mathematical model of DFIG and the stator-flux-oriented vector control scheme. Finally, use the Matlab/Simulink tools for simulation studies, the results indicated that the decoupling control of active and reactive power in DFIG can be efficiently implemented, which can be considered as a reference control scheme for variable-speed constant-frequency (VSCF) wind power generation system.

Abstract: This article selects HOL theorem proving systems for hardware Trojan detection and gives the symbol and meaning of theorem proving systems, and then introduces the symbol table, item and the meaning of HOL theorem proving systems. In order to solve the theorem proving the application of the system in hardware Trojan detection requirements, this article analyses basic hardware Trojan detection methods which applies for theorem proving systems and introduces the implementation methods and process of theorem proving about hardware Trojan detection.