Applied Mechanics and Materials Vol. 192

Abstract: In order to guarantee that the rudder hydraulic systems work normally, the rudder hydraulic system must supply constant-pressure fluid to it. In this article, the author had analyzed the relationship between the power of the hydraulic oil pump and its motor revs, and done researches on its controlling tactics. Next, the author deigned its controller and controlling system based on fuzzy-control theorem. This system could extend the life-span of the pump motor and save energy, and it can also be utilized in other engineering fields.

Abstract: In order to solve the problem of communication on the site of disaster for fire fighting forces to implement their duties in the public domain, advanced WiMAX Mesh structure and characteristics are introduced, also Analysis the security solutions scheme of WiMAX and mesh networking technologies in the field of fire communication, satisfy the needs of data scheduling, fixed or mobile video surveillance, vehicle or personnel location ,emergency communications of mobile command vehicles and other business needs for site command.

Abstract: Intelligent transportation integrated access system can significantly improve the security of computer network systems, while trusted computing technology can effectively enhance the credibility and safety of the terminal, and then construct a trusted network connection. Based on computing technology, this thesis proposes to establish a credible integrated access network, and implement network access control on the remote access equipment, thereby enhancing the safety of the integrated access system. The results show that, through the transmission technology of credible chain proposed in this paper, and remote proof technology basing on device identity and security policies can establish a credible integrated access system, thus effectively improving the security of Beijing intelligent transportation systems.

Abstract: Equipment manufacturing industry is an important factor to measure a country's comprehensive national strength. The servo control technology is one of the core technologies of numerical control systems and motion control, as well as an important part of the equipment manufacturing. This paper, on the basis of motion control, studies the development status of servo control home and abroad and analyzes in-depth the various components of the AC servo control system and the parameter confirmation of the controller. It discusses the approximate processing on control system and simplification of passing functions and uses the best second-order tuning to set the project for the current loop Pl adjustment device, simplifying the current loop into an inertia link.

Abstract: A new concept of using a PV solar power plant as interline PV system is introduced in this paper. As the name suggests, the interline PV system interconnects two (possibly more) transmission/distribution lines by reconfiguring existing PV solar plant inverters. This newly developed system thus can act as a FACTS device providing a flexible control over both active and reactive powers on multiple lines simultaneously.

Abstract: The IEEE 802.1x protocol inherits the advantage of IEEE802.1x LAN and provides a measure to authenticate and authorize the user(or device) which has connected to the local area network.But there are some defects in existing authentication mode based on 802.1x,to control the illegal users.We analysis the working mechanism of 802.1x and the principle of illegal users to access the network.Then the improved method based on monitoring the online users is proposed.It added a detecting module to the authentication server and make use of the interaction between Radius server and client to ensure the accuracy of the list of online users.It can effectively separate unauthorized users from network and protect tht authentication security of the campus network.

Abstract: An active cancellation stealth system was designed based on the phased array techni- que, digital radio frequency memory (DRFM) and field programmable gate array (FPGA). Using the off-line calculation method, which establish goals of omnidirectional radar cross- section (RCS) database, clutter and noise database in advance. Signal processing and control module analyzes the measured radar signal parameter , then find the corresponding target echo data in the RCS database, and real-time adjustment of coherent echo amplitude and phase. Make target scattering field and artificial introduced into radiation field coherent cancellation in radar direction, so that the radar receiver is always in nulls synthesis pattern. Through the combination of software and hardware of the method in engineering realization of active cancellation stealth.

Abstract: According to the problem of NC Turning Machine fault diagnosis,this paper use frame as express of fault case,through XML case of storage and retrieval,which can realize the intelligent fault diagnosis reasoning Based on CBR. The redevelopment data stored of the fault cases in the XML neutral document,while XML doucument has the advantage of small data quantity and strong universal make it exchange and transmission easily. provided a new way of data exchange and information integration.

Abstract: How to enhance the accuracy of sensor node self-localization for limited energy resource networks is an important problem in the study of wireless sensor networks (WSNs). Concerning the advantages and disadvantages of some main algorithms for senor node self-localization, an easy and simple algorithm is proposed to locate the unknown node itself. The algorithm is to improve weight centroid localization (WCL), by the way of determining weight through using the proportion of differential received signal strength indicator (RSSI) that are derived from unknown node and criterion nodes. In contrast to WCL, the algorithm has the strengths of less computation and better determination of weight, and the determination of weight shows more distinguished distinction in the effect on the localization of unknown node, which is caused by various beacon nodes. Simulations demonstrate that the algorithm has a higher localization accuracy than WCL

Abstract: Discusses the theory and symbolic of the algorithm gives another potential application, but also in the system and control. For example, for the question, has made with special structure, but LMI problem data, may cause factorizations LMI more compact. One can even imagine using the algorithm around, looking for the opportunity to LMI automatic eliminate variables, so simplify problem solving, before they get a lot of influence and a potential solutions. We describe theory, the algorithm can be used to factor in the non commuting variable polynomial matrix and application system switches and control problem into a linear matrix inequality.