Advanced Materials Research Vols. 706-708

Abstract: In order to ensure electrical railway’s safe and stable operation, a kind of microcomputer feeder protection device based on a double "ARM+DSP" CPU framework is designed. The hardware design can not only Improve protection performance, but also realize IEC61850 communication protocol. According to electromagnetic compatibility and anti-interference requirements, the whole hardware circuit is designed in detail, the debugging effect is good and can fully meet the demand of the system.

Abstract: In this paper, a fresh digital intelligent control system is designed. The overall project design, hardware principle and control strategy of the control system are presented particularly. The design scheme of the paper is tested and the sample has been manufactured, which shown that the system have such characteristics as small in size, simple construction, good portability, high reliability and stability and suitable for small power brushless DC motor control.

Abstract: A new frequency-voltage modulation drive technique is proposed and analyzed for the use of stepping motor. Hardware circuit and the current compensation control method are given in the article. STM32 MCU control the PWM switch power, and combine L6384 to drive the MOSFET tube which consisting of H-bridge driver circuit. It simplifies the power drive electronic circuit. A high performance drive design about the best of drive curve is used through the analysis and study of the current closed-loop control. It will significantly improve the stability in low frequency and the torque frequency characteristic in high frequency, and the design can be used for high-power automation equipment.

Abstract: In the boiler heating control device of combining DDC and the silicon controlled rectifier voltage regulation device, there are phase shift trigger, pulse width modulation (PWM) and cycle wave cross zero trigger (CYC). Under the different silicon controlled rectifier voltage regulation devices, there are different influences for DDC. It makes the best of the cycle characteristics of the alternating current (AC) for the cycle wave cross zero trigger (CYC). For DDC - temperature control system, there are advantages of high control accuracy, less interference and power source pollution.

Abstract: For Electric Vehicle (EV), energy saving and endurance mileage prolonging are very important. Regenerative Braking System (RBS) is a key point in this respect. At the same time, braking safety is a rigid demand of EV. In this respect, the Anti-lock Braking System (ABS) has an excellent performance. As a result, the integration of RBS and ABS plays an important role in the development of the EV control. In this paper, a dynamic adaptive threshold theory decides when RBS should exist will be studied, and when the states of vehicle reach the adaptive threshold, a sliding mode control method will be used to meet the total braking force and the system will reduce the motor braking force. Before slip rate of vehicle reaches the ABS threshold, the regenerative braking force will be reduced to 0. The braking safety will be improved in this way.

Abstract: The remote information of the intelligent robot, especially the control information, has to be protected for integrity, in order to prevent the enemy or competitors from attack, such as manipulation and forgery. This paper uses the 3GPP integrity algorithm f9 to protect the integrity of the intelligent robot’s remote information, and uses FPGA to realize the hard core algorithm KASUMI of the f9, and gives an implementation example.

Abstract: An adaptive weighted approach based on magnetic gradient was proposed in order to localize the magnetometer sensor and correct magnetic measurement error caused by the position deviation. During the process of localization, the magnetic field produced by various combinations of current-carrying coils was calculated and analyzed firstly. The weighted factors of the objective function were determined on the basis of the magnetic gradient in the predetermined position of vertical magnetic sensors. Then the genetic optimization algorithm was applied to find the optimum of the function. An example of coil combination was analyzed and utilized. The simulation results show that the proposed method is effective to localize the magnetometer sensor, and it can be applied in engineering for its convenience and high accuracy.

Abstract: Based on the spheroid and magnetic dipole mixed array model, the magnetic field intensity gradient of ship is measured by using buoys and optically pumped magnetometers in order to achieve the purpose of eliminating the interference of the background magnetic field, thereby effectively improving magnetic detection of remote targets.

Abstract: In order to develop a robot for colonoscopy, which can provide the same functions as conventional colonoscope, but much less pain and discomfort for patient, a snake-like robot with continuum structure is proposed. The mechanical structure of snake-like robot for colonoscopy is introduced and the angle of single section is calculated. The mechanical model of cantilever beam is built, the force diagram is drawn and the mechanical analysis of single section in bending process is mainly analyzed. Finally, ‘Pro/E’ is used to build model and simulate the process that the snake-like body goes through the colon. This paper lays foundation for the research on snake-like robot for colonoscopy.

Abstract: To optimize the vehicle routing problem with time windows(VRPTW), a mixed ant colony algorithm (MACO) was proposed to accomplish the vehicles’ scheduling. The pheromone adaptive volatile strategy takes real-time traffic status into consideration. Algorithm was accomplished on computer with the c# language.10 examples were calculated. Results show, MACO has a quick convergence rate, the result is stable.