Applied Mechanics and Materials Vols. 599-601

Abstract: Energy-efficient is one of the main problems among all the problems in mobile wireless sensor networks, for improving the energy efficiency of the nodes in the multicast environment and complete the communication works with the minimum cost, we present a based on energy-efficient opportunistic multicast routing for mobile wireless sensor networks. In order to increase the reliability of links, we use opportunistic routing and collaboration mechanism to realize the routing method, and then use the path aggregation to reduce the energy consumption of the whole network. The results of simulation show that, the method presented in this paper is effective in reducing the consumption of links cost.

Abstract: The wireless sensor network represents an exciting development that has the potential to be integrated into an aircraft environment for structural health monitoring. Critical event-triggered transmission scheme were illustrated and applied to prolong the battery lifetime and balance the power-performance tradeoff. The experimental results show that the wireless sensor node using this technology is a powerful solution for aircraft SHM.

Abstract: As an electromagnetic position sensor, Hall position sensor is widely used in various fields. In this paper, we discussed the working principle of the Hall sensor, and proposed a new method on direction recognizing technology. The dual Hall sensor structure has automatical direction recognizing and pre-positioning function, which can improve the adaptability of the sensor. Meanwhile, this new design can be used for other position sensor applications.

Abstract: A PID Anti-lock Braking Control system has been designed according to the principle and method of vehicle dynamic. A vehicle dynamic mode which includes tire model, the controller model and braking model has been set up by the MATLAB/Simulink software. The vehicle straight line braking condition has been simulated by using the model, compared and analysed the influence of slip ratio and braking distance by the system, the results show that the design was effective and feasible which also can achieve the goal of prevent wheels locking.

Abstract: In order to realize the warning at the fixed time for the trains closed to the railway crossing, a design method for speed measuring of railway crossing was proposed based on track circuit. Two 25-meter track circuits were set at far end of railway crossing, when the trains closed to the railway crossing, the two track circuits was operation in turns. The single-chip circuit was used to calculated the time interval of the two track circuits operation, then the speed of trains was known and sent to the crossing control center and we can determine the reasonable time about the crossing closed. Experimental results show that speed accuracy can be achieved 0.1m/S that can meet the system requirements.

Abstract: This paper introduces a kind of resistance sorting instrument with fast speed, high precision and wide range based on microcontroller STC12C5A60S2, including its work principle and composition of software and hardware. Resistance test method of the sorter’s low and high resistance segment is elaborated in the paper. The resistance sorter is an intelligent instrument, which is designed for grouping and filtering of finished resistance on the production line.

Abstract: Considering the current situation that ground wire is short of automated management, a temporary ground wire monitoring system is designed in this paper. In this system, RC 522 RFID reader chip is used to achieve reliable information collection of the state of ground wire and ZigBee chip CC2530 is used to achieve accurate information transmission. A comprehensive test is conducted. Against the interference, obstacles blocking and network congestion issues in a substation, proposes to increase routing nodes, adjust letter spacing, etc. to improve communication reliability. The system can achieve real-time monitoring of the status of temporary ground wire in a substation job site,with high reliability and good effect,which is worth being extended.

Abstract: Aims. A kind of two levels self-integrating capacitive voltage divider is designed to online measure high voltage nanosecond pulse. Methods. The circuit principle of capacitive divider is analyzed, and the theoretical voltage ratio is calculated. The calibration is carried out by using a low voltage pulse source. The divider with a primary voltage divide ratio 601 has been tested to frequency response exceed 1GHz. The second voltage divide ratio can be set flexibly using different ratio attenuators according to the different voltage level of the source. Result. Finally, this divider is used in measuring 600kV high voltage pulse source, and the experimental results show that the present coaxial capacitive divider is reliable and satisfactory for the measuring requirement in time domain and frequency domain.

Abstract: Milking machine automatic control is not only an important part for dairy farm to achieve of digital management, but also one of the key development of animal husbandry. Milking machine automatic control can improve production efficiency of dairy farm and quality of raw milk. First, the need of the milking factory is known, and an automatic control requirement is developed. Secondly, an AVR microcontroller core AT90CAN128 of ATMEL, used as the centre of the controller. And then, the hardware system is designed in several modules. In the last, the software of the controller is designed in detail based on certain need. The project uses the research method of combination of experimetal research, analytical studies and lessons learned. First the paper designs the hardware circuit board and the software development of the milking machine controller. Then through debugging of the physical machine, the paper implements the function of milking automatically and cleaning automatically. The results has reached the milk production expectations, and achieved good effects.

Abstract: The synchronizer is often used for the measurement of axis-angle because of its simple structure, reliability and high precision. But the output signal from the synchronizer is an analog signal, so it is difficult to realize digital measurement. This paper introduces a measuring circuit based on a singlechip. This circuit can produce exciting signal independently and no extra exciting power supply is needed, making the application easy. The AC signals output from the synchronizer are converted into DC signals and then measured directly by the singlechip. The measuring data, after being processed, are turned into serial data to output through a RS232 serial interface. The synchronizer equipped with the circuit will be a digital axis-angle sensor. The sensor is of high precision and reliability, low price, easy application and high practical value.