Advanced Materials Research Vols. 655-657

Abstract: Considering that insulator flashover accident frequently occurs in high voltage transmission line, a kind of insulator string flashover positioning system is designed. The positioning system is on based on the fact that ultrasonic and ultraviolet energy is released when flashover occurs. To make sure whether a flashover accident occurred, sensors are used to detect ultrasonic and ultraviolet waves near the insulators in real time. The detecting results and accident position information will be uploaded to the monitoring center wirelessly using GSM/GPRS (Global System of Mobile communication / General Packet Radio Service), which can make it easy and fast for operating personnel to locate the accident, reduce troubleshooting work and quickly recovery power transmission. The experiment shows that the system has lots of advantages such as high sensitivity, high positioning accuracy, more stable and so on.

Abstract: The current calibration methods of combat aircraft’s attarck angle sensors are too complex and have some insufficiencies. According to the detailed design requirements of flight control system，a method combined with linear fitting and neural network identification is proposed, which can calibrate the measure data of the attarck angle sensors qucikly and accurately. The method proposed avoids the disadvantages of traditional interplation method， improves the computating efficiency, and ensures the the flight control system’s fault-tolerant ability. A simulation on flight control system with this calibration method was carrid out, which validated the precision and dependability of the method. The method can also deal strong nonlinear data quickly.

Abstract: The use of PLC, A/D module, D/A module and the communication module achieves the hardware modularization. The development and the encapsulation of various function modules in LabVIEW achieve the software modularization. The modular design of the hydraulic CAT system shortens the development cycle and improves the expansibility and the universality.

Abstract: In the research field in automatically recognizing license plate of vehicle, to locate the license plate acts as the key issue. The paper posed the method by graying and binarizing the color image firstly, and then to project the binarized image in both horizontal and vertical directions, as well as to locate the area of license plate according to its geometrical characters maximally. The Test results proved that the method performed well in speed and precision of locating.

Abstract: To satisfy the requirement of the control parameters in greenhouse, this paper introduced the design scheme of monitoring and control system based on Zigbee due to its low-cost, simplicity and mobility. We designed the sensor node, control node and gateway node based on CC2430, described the design method of hardware circuit and the flow chart of software. By monitoring the environment factors in real time, such as illumination, temperature, humility and carbon dioxide, the spray system, ventilation fans and lighting lamps were automated controlled to satisfy crop growth requirement. The monitoring system is easy to expand and update, and the program interface is friendly to operate.

Abstract: Meteorological disasters seriously endanger bullet trains running in high speed, so this paper puts forward a design of meteorological monitoring system for high-speed railway (MMSHSR). The system monitors meteorological disasters to ensure bullet train to run safely and efficiently. Consisting of automatic weather stations (AWS), GPRS network, Internet, monitoring center, LAN, etc., this system automatically collected meteorological parameters, sent them to the GPRS network by the GPRS module. Receiving terminal received these parameters and sent to the monitoring center, which processed these parameters, sent them to railway departments through Internet which managed the train operation according to these parameters, to improve the traffic safety and efficiency. The paper discusses in detail the overall design, AWS hardware design and the system software design.

Abstract: A solution to the Car body fault self-diagnostics based on CAN bus is developed. It completes the fault diagnosis communication between the body controller and the diagnostic apparatus by treating the ISO15765-2 as the network layer, and the ISO14229 as the diagnostic application layer. The parameters and services of the two standards are customized to the needs and characteristics of the body control system. Finally, the diagnostic programs of the corresponding body control module and the upper computer are compiled and tested. Satisfactory results are achieved.

Abstract: The aim of this research is to investigate the feasibility of developing a traffic load detector system for the purpose of accurate weighing vehicle to aid traffic management systems. The possibility of estimate the velocity, axle and gross weight of a moving vehicle from the surface of pavement tensile strain is investigated. The objective is to develop weigh-in-motion (WIM) technique to estimate the vehicle weight from the pavement responses with fewer disturbances to the vehicle’s vibration and traveling speed, and to provide more reliable and durable WIM systems and sensors. The repeatability, sources of error, and accuracy of weight prediction were discussed.

Abstract: The basic analysis methodology of micromachined accelerometer reliability are developed. The reliability of micro-accelerometer system are basically analyzed mathematically based on probability theory, indicating that the fracture strength distribution of accelerometer structure keep to Weibill distribution, and the stress distribution keep to normal distribution. Fracture reliability degree for micromachined accelerometer is defined as the probability that strength is greater than stress. From this, we can predict and evaluate various micro-accelerometer fracture reliability under shock load. The methodology of reliability is also commonly suitable for other MEMS devices.

Abstract: The velocity and amplitude of elastic wave in the rock mass are dependent on the physical and mechanical properties, as well as the structural and stress state of rock mass. The elastic wave testing technique has become one of the most important approaches in geological engineering and rock mechanics. In order to enhance the analysis and application of elastic wave testing technique, the present paper investigates the elastic wave propagation pattern both in laboratory and in field. The lab tests focus on wave velocity in rock mass and the field work focus on the measurement of longitudinal wave velocity by using double-service elastic wave test. The field tests also include the testing of the roadway surrounding rock loose circle on the edge of underground chamber construction site. The study profiles the rock mass’s elastic wave dynamic characteristics, clarifies the rock mass structures, assess the property of the rock mass surrounding the subway. All these are of great significance to the underground chamber and tunneling engineering design and construction.