Applied Mechanics and Materials Vols. 121-126

Abstract: The workpiece processing is sometimes necessary to obtain details of the magnified image. Especially in the CAD, CAM and CNC applications in the field. This article constructs a rational quintic spline interpolation, and interpolation used in the image to enlarge, by the five local parameter interpolation function has the shape control performance, making the image zoom in or out of, according to the need for control. Experimental results show that the interpolation functions of the five constructed in effect in the workpiece, surface shape control.

Abstract: Computer and network security is one of the most emergency issues for a large scale of applications. The unexpected intrusion may make terrible disaster to the network users. It is therefore imperative to detect the network attacks to prevent this kind of violations. The intrusion patter recognition is now a hot topic in this research area. The use of the artificial neural networks (ANN) can provide intelligent intrusion detection. However, the intrusion detection rate is often affected by the input feature vector of the ANN. This is because the original feature space always contains a certain number of useless features. To overcome this problem, a new network intrusion detection approach based on manifold learning nonlinear feature dimension descending and ANN classifier is presented in this paper. The locally linear embedding (LLE) algorithm was used to reduce the original intrusion feature space. Then the satisfactory ANN model with proper input features was obtained. The efficiency of the proposed method was evaluated with the real intrusion data. The analysis results show that the proposed approach has good intrusion detection rate, and performs better than the standard GA-ANN method.

Abstract: Online monitoring and fault diagnosis is an important link of guaranteeing the equipment smooth operation and reliable working, which receives general concern. This subject uses the strategy of combining theoretical research and experimental research, and establishes a set of automaton fault diagnosis theory and method based on motion morphology and information entropy. It solves the following problems, the weak fault signals in the short-time and transient vibration response signals are easy to be drowned in practical application, effective and sensitive characteristic parameters are difficult to be extracted, accurate positioning of fault and real-time diagnosis are difficult to be realized. Use the motion morphology and information entropy to put forward new ideas and methods for the short-time and transient vibration signals analysis processing and feature extraction, and is applied in artillery automaton field, which expands the research scope of mechanical fault diagnosis subject.

Abstract: In order to improve the severe service conditions and balance the needs between the better filling capacity and longer die life, a new flash structure named by resistance wall was introduced into knuckle hot extrusion dies. Focusing on filling capacity, the maximum deformation load and the highest die surface-layer temperature, different die structures, such as flash slot structure, traditional closed die structure and resistance wall structure, were comparatively analyzed by FEM simulation. It is shown that the resistance wall structure can be extensively used in many applications thanks to its comprehensive performance.

Abstract: To maintain stable operation and quality of cloud system, enterprises are required to form quality management project team, providing highest-level stability and security of cloud system by applying concepts of quality management. For this reason, the study starts with the perspective of quality control to develop a set of key success models for evaluating cloud system management and quality maintenance. The study attempts to apply basis of QFD and integrate the requirement guidelines of each cloud system management and maintenance into improving factors related to PMMM, in order to explore the relevance between cloud system quality and project management process. Finally, the study discovers the 4 requirement guideline factors and the 5 project management process in cloud system management and maintenance through quality model analysis and case verifying results of the study, that shows significant impact level on the project team in the implementation of improving cloud system management and quality maintenance.

Abstract: The contour precision has been an important CNC machine accuracy index along with the increase of high precision complex parts NC machining. The error of perpendicularity and the mismatch error of position loop gains among linked axes are regarded as the prime reasons to bring about CNC machine contour error. After analyzing the influence of the error of orthogonal axes perpendicularity to CNC machine contour precision, a compensation approach is set up that the following error is corrected in each sampling period, by introducing a perpendicularity deflection parameter. After analyzing the influence of the mismatch error of position loop gains to contour precision, a cross-coupled control approach based on interpolation dots is developed to enhance the matching degree among all of the linked axes. Finally, the developed compensation approaches are testified on a CNC experiment table. The experimentation results reveal that the developed compensation approaches are effective to enhance contour precision.

Abstract: Use Kingview to acquire and display the centrifugal pump performance parameters for the real-time data, and will stored the collected experimental data in Access databases, using VB database read, and drawing function for the data processing and rendering performance parameters of relationship curves.

Abstract: The contact pressure of packer of rotary blowout preventer (BOP) act on drill pipe is closely related to the life and performance of rubber core. According to the actual working condition of the drill pipe and connector passing through the packer in the process of drilling, this paper establishes a three-dimensional mechanics model for sealed drill pipe of packer with ABAQUS finite element software , it simulates the characteristics of contact pressure changing while the drill pipe and drill pipe joints went through the hole of the packer, and obtained the location and the distribution rule of the maximum contact pressure of drill pipe packer at a certain wellhead pressure, and also studied the different packer materials and movement characteristics of drill pipe, and mastered the influence disciplinarian of the friction coefficient between the packer and drill pipe that act for the packer’s contact pressure.

Abstract: In order to suppress the friction and leakage interference of continuous rotary electro-hydraulic servo motor, make the motor tracking the periodic signals with high accuracy, and improve the high frequency response performance of continuous rotary electro-hydraulic servo motor, this paper established the mathematic model of the electro-hydraulic position servo system of the continuous rotary motor, and adopted the controlling method based on the zero phase error tracking controller to suppress the interference. Through the simulation, the result confirms that the zero phase error tracking control method decreases the tracking error of the system, increases the robust performance of the system and improves the frequency response performance of continuous rotary electro-hydraulic servo motor. This method is simple and feasible.

Abstract: To improve the power performance and fuel economy of hybrid electric vehicle, a design idea of hybrid coupling system that combines power coupling function of planetary differential and continuous ratio regulating characteristics of continuously variable transmission is proposed. Four designs of the coupling system that compact and operating mode is complete relatively are identified through using the method of lever analogy. The paper analyzes varieties of operating modes and power transfer lines of new type of coupling system in different vehicle conditions, such as normal travel, astern driving, vehicle start, engine start, parking generation, decelerate/brake, etc. Application and superiority of the four schemes of the coupling system applied to HEV are analyzed at last.