Applied Mechanics and Materials Vols. 63-64

Abstract: Taking crank-connecting rod mechanism for example, this paper uses the Pro/E modeling, uses the 3D-MAX to create a disassembly animations, and then uses image processing software Fireworks and Web Design Software Dreamweaver(both belong to the webpage three swordsmen ) to design a basic page. The former two contents and the other searched information, such as courseware, pictures, enterprise-links and driving test and so on, as a resource to fill the web page. Finally completes the design of an informationization platform, making it to be an intuitive, comprehensive, efficient learning channel.

Abstract: Industrial field diagnosis and management system based on the Internet of things which has advanced technologies and perfect functions was designed, through the analysis on industrial field diagnosis technology, information fusion methods and the framework of industrial the Internet of things,. Field fault detection, fault diagnosis and fault isolation and the structures of the sensing layer, the middleware layer and the application layer of the Internet of things of industrial as well as information fusion algorithms of data level, feature level and decision level were made to correspond to each other and site diagnosis knowledge, the Internet of things technology and information fusion algorithm were used to achieve remote monitoring center or handheld terminal on site for industrial site diagnosis and management functions. A good solution was provided for equipment manufacturers and industrial applying the Internet of things to do site diagnosis and management.

Abstract: By means of finite element method software simulation analysis, using strength reduction finite element method analyse factor of safety of embankments. Nowadays most finite element program is analyzed in the perfect elasto-plastic with the Mohr-Coulomb not equiangular hexagon circumcircle Drucker-Prager yield criterion, it have margin of error with not equiangular hexagon in π-plane, so we use Mohr-Coulomb equivalent area circle D-P yield criterion instead of it. Calculate conversion coefficient of two safety factor under different yield criterion. Using safety factor through finite element software by strength reduction multiply by conversion coefficient, get new safety factor. Through the example of high embankment of old road widened in Shanghai-Chengdu expressway Hejiaping cable section K2+ 710~890, validation of this method calculated the accuracy of the safety factor, the results show that the new factor of safety closer to the true value.

Abstract: It's one of the important management job of each university currently that discovering and monitoring the public network opinion in the campus.This article describes some of the major basic research of the university network public opinion discovering and monitoring system .First and foremost,this paper studies the method of capture packets on the outlet of campus network using Libnids network security development kit.Second,the contents of HTTP, POP3 and STMP packets are separately analyzed . Finally, The data obtained from the above steps provide the ideal data preparation. for the the university network public opinion discovering and monitoring system .

Abstract: This article discusses the development of variable field of view (FOV) of camera to realize headland turning of an agricultural robot in corn fields. The variable FOV of camera was implemented to change direction of view of camera by two DC motors rotating separately in vertical and horizontal planes. Headland turning is executed in six steps: end of row detection and guidance, going blind for a distance, first 90˚ turning, position calculation, backing control, second 90˚ turning. Mathematically morphological operations were chosen to segment crops, and fuzzy logic control was applied to guide the robot. Three repetition tests were conducted to perform the headland turning. A maximum error of 17.4mm when using the lateral view and good headland turning operation were observed. It was successful for variable FOV to implement headland turning of the agricultural robot in corn fields.

Abstract: In 2009, R. Tso et al. proposed an efficient pairing-based short signature scheme which is provably secure in the Random Oracle Model. In this paper, we propose a new key substitution attack on Raylin Tso et al.’s short signature scheme. For a given message and the corresponding valid signature, the malicious attacker can generate a substituted public key. Everyone verifies the signature successfully with the malicious attacker’s substituted public key. Therefore, Raylin Tso et al.’s short signature scheme has a security flaw in the multi-user setting.

Abstract: Control flow graph plays an important role in software static testing based on defect patterns, while the impact of runtime exception on control flow graph is not negligible. After the runtime exception control flow graph and exception pattern Finite State Machine were defined, an algorithm for fault detection in the presence of runtime exception was proposed. Basing on FSM for exception pattern, the feasible states and its condition are iterated along the node of control flow graph, while the abnormal status, which can throw a runtime exception, will be added into control flow graph as an edge automatically. Thus the static testing method can detect more defects by the control flow graph constructed dynamically. The experiment results show that, the static testing method in the presence of runtime exception can decrease defect false negative significantly.

Abstract: This paper presents a new spatial index structure - cache quadtree. Cache quadtree combined with the advantages of spatial indexing and caching. According to the characteristics of spatial data, query uses the previous query results as much as possible, only the necessary queries are performed on the server. Meanwhile, full use of query results in the cache tree; reduce the server's query and its query range. Our paper gives the cache quadtree structure and the key algorithm in detail.

Abstract: Structure and work principle of micro pump developed with shape memory alloy (SMA) materials are introduced. The math model is established to analyze the basic performance parameters. The pressure distributions of the diffuser and the nozzle of valve-less micro-pump were analyzed theoretically,the basic flow equations were obtained.The finite element method was applied to calculate the velocity and pressure fields of the diffuser and the nozzle numerically,and the factors which influences the flow characteristic of the valve-less micro-pump were investigated. Simulating the actuator deformations of the micro pump, The feasibility of the operation prineiple and design method of the valveless Pump driven by the SMA actuator has been Proved by the analysis and test results.The result shows that the micro pump based on SMA materials has some advantages of fast response, large flex displacement and high control precision ,etc.

Abstract: A virtual instrument which has the function of data acquisition, displaying and saving, time domain analysis, frequency domain analysis and so on is developed successfully. It combines the developed VI software Labview with the software Star for modal analysis，and makes program for controlling the data acquisition card，to generate a file with a fixed data format，and applies this file in Star System to complete the experiment of modal analysis. In using VI (virtual instrument) for modal analysis of mechanical structure the system realizes data collection、save、display、analysis and processing. From actual working we can make a conclusion that it has the advantage of low-cost, stability, high rate, efficiency and reliability.