Applied Mechanics and Materials Vols. 462-463

Abstract: Based on TDMA sleep scheduling scheme, by collecting cross-layer routing information and feedback information, according to the detection of routing information and neighbor information, the sleep slot and data transmitting slot are assigned orderly on TDMA based channel by Mesh router. The sending and receiving mutual interference collision is eliminated by slot allocation with collision avoid method. Moreover, path wake up strategy in terms of the nodes hop are introduced which can assign listen frame and wake up slot better. As a result, a TDMA-based energy efficient cross-layer MAC protocol for wireless mesh sensor networks are proposed, and then the performance of the protocol are analysis by simulation. The study results show that based on WMN and WSN, WSN and WMN can be constructed to achieve a full interconnection network named WMSN.TCP-MCA protocol can effectively reduce idle listen time of node which reduce overall energy consumption of the network.

Abstract: With the needs of the society development, the light intensity detection technology has gradually into the lighting control, health care, biological research and other fields. Based on many fields and equipments for the light requirement, this paper proposed and designed a light intensity detection system. The hardware circuit used the STM32F103VB as the main controller; collocate with BH1750 digital light intensity sensor and LCD module, the power supply module. The design of software used the modular design, including data acquisition, data display, and intelligent control module. After the practical application, the detection system works well.

Abstract: In this paper, structural states of a simple composite plate specimen are monitored using the fiberoptic sensing array and the probabilistic neural network. Firstly, structural states data were collected by a data collection system based on the fiberoptic sensing array embedded within the material, and were utilized as feature vectors of structural states. Secondly, structural states to be monitored were defined according to the load location and the load level. And the number of states was reduced by grouping neighboring elements to one category. Finally, the probabilistic neural network used for structural states monitoring was designed. The smoothing parameter in the probabilistic neural network was studied. And structural states were identified based on collected data. When this trained network is subjected to the measured response, it should be able to monitor the load location and the load level. The effectiveness of the proposed method was demonstrated.

Abstract: According to real-time and limited energy of the wireless sensor network (WSN), this paper proposed an ant-colony algorithm (ACO) for optimal routing. The algorithm limited the search space to next node based on search angle and designed directional pheromones to guide ants to the destination node. Using negative feedback mechanism encouraged later ants to choose the optimal path. When ants are timeout with limited life cycle, go back along the way and reduce the pheromone. Probability-transfer function contained the factors of distance, energy, pheromones and search angle. Compared with other ACOs, the results show that it can balance the energy consumption and improve the routing in aspects of energy, dead nodes, short path and time delay.

Abstract: Petroleum products in oilcans are volatile, inflammable and explosive, which may lead to explosion of oil tank and collapse of building in case of fire. Reasonable design of oil tank and study of oil tank fire extinguishing introducing new method are very important to property safety and social stability. This paper intends to design a safety monitoring system of oilcan during transportation. Vehicle safety monitoring is studied and we analyze and summarize the many factors that affect vehicle safety, and practicality of extracting a representative vehicle safety monitoring technology, analytics implementations.

Abstract: There has been a lot of research on traffic flow density detection in recent years. In this paper, we propose a simple and practical method for traffic flow density detection through using the multiple pairs of infrared photoelectric sensors and STC15F2K60S2 as the main controller. This method can be used for the multiple cars two-way or multi-way side by side traffic flow density detection. The circuit is simple, accurate and efficient. The proposed method is economical and practical. Thus it can promote the progress of urban traffic management.

Abstract: The low water and nitrogen utilization rates and environmental pollution as a result of the excessive irrigation and fertilization had been paid more and more attention. Adopting the simulation model based on physiological processes to study the optimization method and control technology of agricultural production and management is important to water-saving, rational fertilization and healthy environment. The maize (Zea mays L) is taken as material to explore the integration method of crop simulation with wireless sensing data. First the time scale and temporal scale of wireless sensing data will be unified with simulation step of crop model when the parameters are used as model inputs. Then the relationship between nitrogen balance and soil moisture will be analyze to construct maize production and management monitoring and control system based on wireless sensing data. The system can not only simulate the real-time and dynamic maize growth and development, but also provide the irrigation and fertilization schedule to distribute the annual natural resources depend on the users production goal. The expected forecast results will offer theoretical basis and technological support for intelligent control, water and fertilizer utilization, and management of agricultural production departments.

Abstract: The Concept of a virtual instrument and the computer aided testing system for hydraulic based on technology of virtual instruments are represented in this paper. Virtual instrument technology is employed to construct the software and hardware framework. The modularized system gained features high flexibility and expandability.

Abstract: To overcome the deficiency of the existing billing modes of hot water system, such as based on time or flow signal alone, in this paper a billing method which integrates several signals is presented. The detected flow, temperature and time signals are synthesized to determine the billing function of hot water. Due to the different seasons and regions, an adjustment factor is designed to make the billing function more flexible and intelligent. This may make users’ expenses reasonable, and it also considers the loss of the managers. This proposed billing mode is successfully implemented in the hardware system controlled by Single-chip Microcomputer.

Abstract: The real-time capacity-increase technology of transmission lines is adopted to increase transmission current capacity of transmission lines, by which the conductor temperature, the ambient temperature and the wind speed can be timely measured and the transmission current capacity can be adjusted dynamically without breach of available rules. A new type of Morgan's transmission line dynamic capacity-increase model is established, which can fast and effective computing the current line transmission capacity, and the transient running formula of transmission lines is established, the mathematical relationship between the conductor allowable temperature and the variety of sag of the span is presented, and the application of the monitoring device is introduced, it has important significance to research the power grid transmission interface dynamic capacity-increase technology.