Applied Mechanics and Materials Vols. 155-156

Abstract: Process communication in Software engineering is often involved in technical methods, the traditional process of communication between processes rarely take into account the degree of mutual relations and affinities for the inter-process security control are rarely involved. In this paper, the use of complex network theory to describe the process communication model based on the analysis of the characteristics of the process of communication and management processes in complex network theory on the lack of communication, then learn from bio-neurological principles proposed in the white matter to form an adaptive white matter model, and applied communication management in a dynamic process to improve the efficiency of the process of communication and security issues.

Abstract: Cluster has become a new generation of distributed system. Among the server cluster technologies, request distribution technology is used to distribute requests among server nodes, providing support to large-scale concurrent access to server cluster. In order to overcome the weakness of existing request distribution strategies for server cluster in average response time and computation cost, this paper proposes a request distribution strategy based on static time interval. Its basic idea is that it divides the update interval into several subintervals and introduces randomness into the selection of server node for the requests arrived in a subinterval. We give an implementation of the strategy and use MATLAB as the simulation platform to carry out simulation experiments in testing the performance of the strategy. Our theoretical analysis and experimental results show that, the strategy we propose achieves shorter average waiting time, more convenient implementation and lower computation cost than other several existing request distribution strategies.

Abstract: The development and research of three-dimensional (3D) simulation system of the garments CAD (Computer Aided Design) will change the traditional graphic design concepts and design methods, which will develop from two-dimensional (2D) to 3D. It means to build a comprehensive calculating methodology for forming real garments simulation system on the computer. Combining with the advanced CAD technology and technical works of Chinese garments industry will greatly improve the level of the sustainable development and intelligentialization of the software, and will accelerate the technical upgrade of modern garments industry and push the rapid development of national economy.

Abstract: The electro-hydraulic actuator which was designed based on the technology of the direct drive volume control, has the advantages of small volume, high reliability, energy saving and so on, and can effectively overcome the deficiency of traditional valve control electro-hydraulic actuator. This paper realizes co-simulation of direct drive volume control actuator (DDVCA) by using AMESim and Matlab/Simulink. The simulation results show that DDVCA has the characteristics of smooth operation, fast response speed, high control accuracy. Therefore, DDVCA can replace traditional servo valve electro-hydraulic actuator in the case of low frequency response requirement.

Abstract: A using SiGe HBT variable gain amplifier (VGA) with filtering for wireless receiver system is presented in this paper. The VGA consists of three stages. The first stage is the gain control stage, and the second stage is the fixed gain stage. The third is the GM-C filter. The VGA is driven by a 3.3-V power supply, and linear gain control range varying is from 26 dB to 62dB. When control voltage varies from 0 to 1.8V. The input 1-dB compression point is -4dBm at minimum gain. The VGA is fabricated in a 0.5 μm = 80GHz and =90GHz silicon germanium heterojunction transistor technology.

Abstract: A simple and effective combined subdivision surface’s modification method is proposed, which is realized by editing its curve network locally. After discussing the overlapping principles of Catmull-Clark subdivision and combined subdivision, a quick update method of the modified surface is given by building the difference curve network from the original curve network and the edited curve network and overlapping the mesh from the difference curve network to the mesh from the original curve network. This method is closely related with the features of combined subdivision, so it is simple and high efficiency. It is useful in the concept design of complex product.

Abstract: According to the report of the United States transportation department, mechanical damage is one of the most important reasons for the pipeline accident .The most typical form of mechanical damage is indentation. Dent defect is one of the important factors affecting pipeline fatigue life, and it will greatly reduce the fatigue life of the pipeline in service. Meanwhile the dent displacement will be changed with the operation pressure fluctuations of the in-service pipeline, resulting in a circular bending stress, which directly affect the pipeline fatigue life. For typical plain dent on pipeline, the finite element models are established under different circumstances. A large number of the calculation results are sorted, inducted, drawed. On this basis, the results are analyzed by univariate. Non-linear regression analysis was utilized to fit the results by matlab, some specific expressions of the relationship between the dented pipeline displacements and the dent depth, the dent longitudinal length are obtained after much calculation and analog.

Abstract: The super-high potentials of Metro rail will have a crucial influence on Metro’s safe operation, personal safety and the corrosion of underground metal structures. This paper analyzes the principle of the generation for rail potentials and the influencing factors of the high and low Metro potentials. Staring from the hazards of super-high potentials for Metro rail, the paper studies the established technical measures which focus on the super-high Metro potentials, puts forward the analytical approaches to the high and low potentials, summarizes three kinds of different decrement measures on the situation of the real-high potentials according to the different structures of Metro traction networks, and provides the reference on the decrement technology of Metro rail in China.

Abstract: This paper analyzes characteristics of automated warehouse stocker picking operating process. Path optimization problem is considered as traveling salesman problem. The coordinates of picking points by calculating determine a stocker running route. The mathematical model of a path distance is built. And using the improved genetic algorithm solves the above problem. Finally, M-file program of stocker running path optimization is written and run in MATLAB. The simulation results that, in solving stocker path optimization problem, it can search for a shortest path by genetic algorithm. Thereby enhance the efficiency of automated warehouse system, increase greater benefits of the enterprise.

Abstract: A modifying Sub-threshold Weak Conjugate Gradient Pursuit Method is proposed to improve recovery accuracy of Compressed Sensing. This method adds a direction in the Directional Pursuit Method and uses a stopping criterion for the indices of elements, then the evaluation of sparse signal is obtained by using Least Square Method. The simulation shows that for the same sparsity level, the number of measurements needed by the method is less than that needed by MP or StOMP-FDR to exactly recover, and the recovery accuracy is higher.