Applied Mechanics and Materials Vols. 556-562

Abstract: Basic on the problem that the electromagnetic environment in vehicles which formed at the moment of ignition will cause interference to the stability and reliability of vehicle safety system, the paper takes vehicle fire protection system as the research object, and analyzes the interference mechanism and harmfulness through the simulation experiments. Finally uses the related software design and some prevention measures for electromagnetic interference such as shielding, grounding to protect the system, then through experiment to verify that it’s scientific and reasonable.

Abstract: We describes an operational concept in this paper, it enables increased airspace and airport capacity by using the Flight Management System (FMS), Required Navigation Performance capabilities (RNP) and air traffic management automation tools. This concept can be applied to en route and terminal operation. It realizes ground to air communication by using of voice and data chain. This paper analyzes several key performance parameters which affect arrival management process. This concept models the arrivals by using the performance modeling approach. The results of the modeling proves several factors that influence the delivery accuracy and delay in the arrival process ,these factors include the path and speed discretization, wind, trajectory prediction and navigation performance.

Abstract: Ethernet passive optical network is a new optical access network technology characterized by low cost, high bandwidth, little electromagnetic interference, strong scalability, and powerful compatibility. The auxiliary control system of smart substation includes video surveillance system that carries large data volume but raises low real-time requirement. Constructing the auxiliary control system in the station with Ethernet passive optical network can effectively solve the problem of export bandwidth allocation without using a switch, thus greatly saving the investment in network construction and the costs for life-cycle maintenance. It is therefore regarded as an efficient new networking scheme for the auxiliary control system of smart substation. This paper analyzes the feasibility of applying Ethernet passive optical network technology in the auxiliary control system of smart substation, proposes a program to construct a 220kV smart substation using Ethernet passive optical network, and conducts an economic comparison, in an attempt to provide a new solution for the data transmission of the auxiliary control system of smart substation.

Abstract: For the PWM mode of BLDCM speeding, the paper presents a detailed analysis on five PWM modulations, and presents the six switches’ working waveforms, the motor armature voltage and current waveforms on different PWM modulations. The simulation results show that HPWM-LON mode can significantly reduce motor armature voltage harmonic component, and can create good condition for the motor running. So we choose the right speeding way of BLDCM which has very important practical significance for industrial and agricultural production.

Abstract: The traditional virtual assembly technology requires building a true three-dimensional scene of all the assembly data, leading to complex modeling, low sense of reality and efficiency of real-time interaction. An augmented assembly system based on markers is proposed. The camera calibration technique is studied to get its inside and outside parameters first; a 3D registration algorithm based on markers is used to determine the exact location of virtual objects in the real scene then; the augmented assembly system is constructed according to the characteristics of virtual assembly finally. Experimental results show that the augmented reality technology makes the assembly steps appear in front of the staff intuitively and allows them to complete the actual assembly correctly, improving the sense of reality of the operation and interaction efficiency.

Abstract: China’s present communication systems in coal mine can not effectively transfer information. Hence, rescue efforts are hard to be carried out in case of coal mine accident. To deal with this problem, a method of mine wireless communication system with low-power dissipation based on Zigbee wireless technology is presented. The paper at first introduces the characteristics and structure of ZigBee protocol, then introduced wireless communication networking mode of ZigBee device in coal mine underground, and gave principle of personnel position of coal mine underground and its realizing process.

Abstract: With the increasingly fast-paced software releasing or updating, research on the method of an efficient software automation testing framework based on cloud computing has become particularly important. In this paper, we propose an automation testing framework over cloud. We also describe some key technologies in the aspect of the design of hierarchical test case and automatic distribution of test cases in the cloud computing environment. Testing experiments show that our framework can take advantage of on-demand testing resources in the cloud to improve the efficiency of automation testing.

Abstract: With a growing population of elderly people, more Web pages designed for the elderly appear. The design of Web pages not only is required to meet the physical characteristics of the elderly, but also needs to meet the characteristics of elderly visual behaviors. This study aims to investigate the strategy of elderly people in visual search and browse on Web pages using eye-tracking. The experimental results showed that, in visual search, the elderly people were under a higher mental load, and more likely to pay attention to the peripheral area; whereas in visual browse, their mental load is lower, and more likely to pay attention to central area. The results indicate that, the Web pages designed for the elderly should try to put the title with the hyperlink feature on the peripheral area, and put the main information content on the central area. Furthermore, it should take measures to reduce the mental stress of the elderly in visual search on Web pages.

Abstract: Based on a hotel management information system developed by the ASP.NET technology and browser / server mode, for example, the security of the system was checked by software testing techniques, and the security flaws were found in the system, the improvements algorithm was given also.

Abstract: Main considerations for development of a virtual instrument (VI) have been presented, which include determination of algorithms, signal match, software filtering, meaesures to correct systematic errors, sampling rate, dand design of the control & diagram panels, debugging & simulating, and selection of developping platform. An example is given to illustrate the successful application of these considerations to process monitoring of brush plating.