Applied Mechanics and Materials Vol. 203

Abstract: Industrial wireless control network brought great convenience in industrial production, and security issues was very important. This paper analyzing the characteristics of the wireless industry control network, and presented a perspective which based on elliptic curve cryptography system, at last, introduction to design a hierarchic structure of the ECC integral solution, then make it better applied to the industrial wireless environment.

Abstract: The business of the harbor expands enormously nowadays and gives new challenge to the harbor management. This paper analyzes the Internet of Things (IOT) based dynamic management system with the correlative key theory and techniques in detail, then proposes the architecture of the digital harbor system and gives the main idea of construction in technique which provides 2D&3D virtual scene to demonstrate the dynamic analysis and forecast the development of harbor.

Abstract: This paper firstly introduced the power system and its significance of automation, and then introduced the power system automation classification and performance, describe function and influence of FACTS controller in the power system automation, Parallel type FACTS device, series type FACTS device, mixed type FACTS device, has great development potential in the future. In the related field has a strong reference value.

Abstract: Based on the grinding and classification process dynamic model, the distributed simulation platform for semi-physical grinding process was analyzed. Based on the feedback correction and dynamic optimal control and optimization model calculated the optimal control law, the quality indicators to feedback regulation mechanism was introduced to eliminate the impact of process disturbances and other uncertainties. Intelligent control unit according to the deviation between the artificial test and expectations of quality indicators can feedback correction of the optimal control law. The field experiment results show that the program to stabilize the process of product quality, to achieve the process of saving energy. The grinding process of the optimal control of distributed simulation platform for the optimal control method and system design provide effective, convenient, reliable and intuitive engineering lab environment. Also it has important reference value to other metallurgical optimization of industrial process control engineering verification and simulation.

Abstract: Combining with some fuzzy of the direct torque control and the fuzzy control which is often used in the traditional AC motor control,we put forward a direct torque control theory based on the fuzzy rule. The brushless doubly-fed machine(BDFM) closed-loop control system with the direct torque control based on the fuzzy rule is simulated by using of the Matlab/Simulink software, and the simulation results show that the closed-loop control method is correct and effective.

Abstract: This design belongs to a branch module of the fire monitoring alarm system: data transmission module. This whole fire monitoring alarm system based on ARM9 whose core is s3c2440, mainly consists of sensor module, server module and data transmission module. Data transmission module covers the two parts of the transmission: the sensor data transmission between PC and ARM9, and the alarm message transmission. The code of the data transmission is written in Linux environment, in which the transplant of Linux, Qt interface, TCP transmission, serial port correspondence technology is involved. To use GSM module to implement short message alarm and phone alarm is the innovation of this design.

Abstract: The present work investigated the adaptive noise control system based on neural network. The structure and the characteristics of ANC algorithm were introduced in detail, at the same time, and the detailed demonstration of the BP neural network was given. Contrast verification experiments were given through the Matlab, and the simulation results have verified the effectiveness and practicability of the algorithm for the adaptive noise system in real control system. Through these methods, the disturbance of various noises in input signal could be reduced effectively.

Abstract: Wireless sensor network (WSN) is one of the key technologies of the Internet, and the problem of load balancing is an important content of the wireless sensor network (WSN). First wireless sensor networks and their characteristics are introduced in this paper, and then bottleneck network problem which is caused by the wireless sensor networks due to the presence of physical obstructions or uneven energy consumption in a real environment is studied, and a solution to optimal routing protocols based on load balancing is proposed.

Abstract: To establish the model of wireless sensor network reliability, the sensor nodes’ reliability was assumed to be exponential distribution. By the methods of MLE and K-S , reliability distribution function of sensor nodes was verified in line with two parameters Weibull distribution . Basing on experimental dates , reliability distribution function of sensor nodes accorded with two parameters Weibull distribution and exponential distribution were in Eq.9 and Eq.10. Comparative results in Fig.5 shows that the two parameters Weibull distribution exceeds the exponential distribution to describe the distribution of sensor nodes.

Abstract: The sensitive characteristics of sensitive device which was closely related to the mechanical properties of its micro elastic cantilever play a role in analysing the performance of piezoresistive accelerometer. To make a research on the response of the system to load, the deformation model of micro elastic cantilever of sensitive device belongs to piezoresistive accelerometer was built based on the method of system identification in this article to analyze their mechanical properties under static external load, the deformation equation was deduced and the quasi-dynamic deformation model of micro cantilever was obtained according to the principle that displacement was directly proportional to load. The conclusion could be used for evaluating the dynamic behavior of structure on virtual operation which would provide reference for optimization design of micro structures.