bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress Analysis of Tall Steel Reinforced Concrete Cantilever Beam
Authors: Ding Ke Wei , Yang Ai Yu
Published: February 2012

With economic prosperity and social development, various kinds of unconventional concrete structure increases day by day, steel reinforced concrete structure has been widely used. The paper demonstrated the Hefei Yangtze-crossing Campaign Memorial Project, by comparing theoretical results with site monitoring data analysis results, summarized the variation of stress and strain distribution in the cantilever truss steel reinforced concrete beam structure. The main content of this paper introduced the study of steel reinforced concrete with the project to make conclusions that they would be significance to apply in the future similar projects for guidance and reference.
Evaluation of the Grouting Effect of the Change of Grout Hole Spacing in Splitting Grouting for Dams
Authors: Wu Ke , Ma Ming Yue
Published: February 2012

The technique of splitting grouting for dams is one of the important technical approaches to improve the inner quality of dam construction. However, the construction cost is too high with the current technological standard, which restricts the further promotion of this technology. Based on the assumption that the other conditions of construction process remained unchanged and by obeying the law of interaction between the placement of grout-hole spacing and the actual anti-seepage effect during splitting grouting, Mohr-Coulomb Hardening constitutive model was adopted in this paper on the basis of large-scale finite element numerical algorithm. Through the fluid-solid coupling computation of grout holes of different spacing, the distribution law of various factors during splitting grouting, such as the pore water pressure generated by seriflux and the stress and strain of dam, was studied first. Next, the mechanism of reinforcement and seepage of splitting grouting seriflux in soil body was revealed, and the influence of this mechanism on the stability of dam body was also investigated. Finally, the effect of splitting grouting was evaluated.
Preparation of Zno-Cr2O3 Composites by a Sol-Gel Method and their Photocatalytic Activities
Authors: Gu Kai Yuan , Peng Zhan En , Feng Jin Hua , Sun Feng Qiang
Published: February 2012

The ZnO-Cr2O3 composites with different complex proportion were prepared by a sol-gel method. The mol ratio of Zn and Cr element could be tuned by controlling the concentration of the precursors. These composites showed photocatalytic activities in degradation of methyl orange under the irradiation of 300W mercury lamp. And the activities regularly varied with the mol ratio of Zn and Cr. When n（Zn）:n（Cr）=10:1, a composite with best photocatalytic activity could be obtained.
Research on the Numerical Simulation Technology in the Cutting Process of Aluminum 2024-T3
Authors: Wang Shi Gang , Yu Yue Qiang , Li Xi Bing
Published: February 2012

Metal cutting is a very complex process of plastic deformation, and chip formation is a typical problem of large deformation, which involves the material nonlinearity, geometric nonlinearity and nonlinear state changes. Strain hardening model of Al 2024-T3 material is established based on elastic-plastic theory of material deformation. Finite element method is used in the analysis of the established model by ALGOR. The distribution of equivalent stress, yield stress and equivalent strain is concluded concretely in the metal cutting process in this paper.
UG Software-Based Socket Cover Mold Design and Processing
Authors: Li Shuo , Dong Ming Fei
Published: February 2012

UG software is one of the most widely used CAD/CAM software in the field of computer aided design and manufacturing. By taking the socket cover as an example, this paper illustrates the application of the UG software-based CAD/CAM function in mold design and processing. And through such procedures as process design, parameter setting, simulation machining, entity processing and etc, real objects of the mold are finally manufactured.
The Mechanical Structure Design of Behavior Training System
Authors: Guo Qiang , Wang S.G. , Li X.B. , Cao Z.L.
Published: February 2012

In recent years, research in robotics, especially in bio-robot research has been much attention. Biomimetic robots that mimic the biological nature of the external shape, movement and behavior of systems theory, to work in the biological characteristics of the robot. Based on the environmental requirements of the structural design of feasible solutions, respectively, to determine the structure and behavior training system for biomimetic smart mice relative to the chassis structure, steering means, electrical layout and some details of the design model, then movement of the body of theoretical analysis, calculation the actual running resistance and the motor power required. Final processing of the entity to verify the feasibility of the behavior of the training system, and the bionic mouse to the system requirements, performance steering and sport good.
Research on Concept System of Rotation-Translation Symmetry in Mechanical Systems
Authors: Ma Zhi Yong
Published: February 2012

Rotation-translation symmetry is grouped by rotation symmetry and translation symmetry, and is a common kind of structure in transmission mechanism, change mechanism, transport mechanism, supply mechanism and so on. Based on the research on a lot of instances, and referring the concept systems of rotation symmetry and translation symmetry, the concept system of mechanical rotation-translation symmetry was established by taking the difference of symmetry benchmarks, the directivity and the alternations of symmetry components as standards. Accurate instances were used for explaining and verifying the concept system. The further researches on the application laws of rotation-translation symmetry can benefit from this result.
Analysis of Key Stresses of Coated Tool in High Speed Cutting
Authors: Xu Ying Qiang , Shi Zu Heng , Guo Cai Hong , Zhao Jian Hua
Published: February 2012

The wear resistance of coated tool can be predicted widely by experiments and theoretical analysis. In the paper, an unique method is adopted to analyze influence of high speed on key stresses of the coated tool .First, through the cutting process simulation with different high cutting speeds, contact stress, shear stress and temperature distribution of the surface of the coated tool can be obtained when the cutting process is steady. Then the stresses and temperature are applied to the coated tool to analyze the key stresses in the tool. The result shows the potential failure of coated tool can be predicted by Finite element analysis correctly. Crack between coating and substrate may occur at the same position with different cutting speeds.
Urban Oversaturated Traffic Network Control Based on Stability Preference Multi-Objective Compatible Optimization Control
Authors: Chen Juan , Hu Qing Song , Sun Xiang Yang
Published: February 2012

To solve the traffic congestion control problem on oversaturated network, the control problem is formulated as a conflicted multi-objective control problem., a new stability preference multi-objective compatible optimization control(SPMOCC) algorithm is proposed to solve the conflicted multi-objective control problem. In the proposed SPMOCC algorithm, NSGA-II algorithm is adjusted by proposing non-even Pareto front spread preserving strategy to obtain some special area on the Pareto front; a stability preference selection strategy is proposed to obtain stable controller. The proposed SPMOCC is used to solve the oversaturated traffic network control problem in a core area of 11 junctions under the simulation environment. It is proved that the proposed compatible optimization control algorithm can handle the oversaturated traffic network control problem effectively than the fixed time control method.
Transmission Mode Research on the Joints of a Multi-Legged Walking Robot
Authors: Gao Hai Bo , Zhuang Hong Chao , Deng Zong Quan , Ding Liang , Liu Zhen
Published: February 2012

In order to obtain an optimal transmission scheme for the joints of supported leg of a multi-legged walking robot, the experience, which comes from the research of a large-scale six-legged heavy-duty walking robot, is used for reference. Five kinds of transmission schemes are respectively listed, and they are respectively analyzed in detail. Based on the comprehensive performance comparison, the listing approach is employed to synthetically compare on excellences and shortcomings among transmission schemes. The best transmission scheme is obtained through the comparative analysis, which provides technique support for the design and analysis on the multi-legged walking robot.
Retarded Modes of Lateral Ferromagnetic/Ferromagnetic Superlattice
Authors: Liu Xiao Hua , Liu Yan Fen , Liu Jing Hui , Song Zhi Zhang , Li Jian Jun
Published: February 2012

In this paper，we calculated the retarded modes of semi-infinite lateral ferromagnetic/ ferromagnetic superlattice with the effective medium theory. Take the Co/Ni system surface modes and bulk modes for the superlattice as the example and found some interesting properties which different from the lateral ferromagnetic/nonmagnetic superlattice. Lateral magnetism/magnetism superlattice have some complex retarded modes which are very common systems，changing the ratio of the superlattice ferromagnetism layer thickness so that two branches of surface modes frequency and bulk modes frequency band can be adjusted consequently. This tailoring effect is related to the two ferromagnetism layers saturation magnetization values. But the two saturation magnetization values are quite different than each other. If the difference between the tow values is large, the tailoring effect of f1 is more obvious. When the saturation magnetization value of the second ferromagnetic medium is approach to zero, this system will become magnetism/non-magnetism superlattice. If in Maxwell equation ε=0, the retarded modes will transite to ferromagnetic/ferromagnetic superlattice magnetostatic modes.
Implementation of Hierarchical Database Attributes Covering in Multidetector A-R Mining Algorithm
Authors: Jiang Shu Feng
Published: February 2012

With the development of artificial intelligence and data warehouse application development,Intelligent and efficient data mining technology has become the huge data bottleneck, This paper studies stratification theory improved technology to realize the property overrides hierarchical database, Data pretreatment based on the mining algorithm, Through in-depth analysis and research, Improved the A-R algorithm, Realize the problem scope expanded and improved the classical association rules mining algorithm efficiency, Based on the realization of the multilevel association rules mining based on the attribute weights of attributes covering hierarchical database mining methods,To improve the mining knowledge representation systems automation capabilities and data mining algorithm and its application to extended practical problems
Global-Based Salient Region Detection for Microscopic Image
Authors: Liu Xiang Jun , Bai Cuixia , Wang Yi Gang
Published: February 2012

The salient region detection has been a very important study in machine vision and image analysis. Reliable estimation of visual saliency allows appropriate processing of images without prior knowledge of their contents, and thus remains an important step in many computer vision tasks including image segmentation, object recognition, adaptive compression and image retrieval. This paper presents a global-based contrast region detection method. The color information and the relevance of spatial location were taken into account. Experimental results show that the proposed method compared with the existed methods, our method yielded better detection effect, more precise and low complexity, at the same time, the method was more applicable for salient region detection of microscopic image.
Research on Limitations for Stabilizability of Networked Controlled Systems
Authors: Wan Shu Feng , Lu Zhong Da
Published: February 2012

In this paper we review fundamental results that form the background for the topics discussed in this dissertation. This paper presents criteria for the necessity and sufficiency of stabilization, and presents the fundamental limitations of feedback control systems caused by causality and finite- capacity communication links. Limitations on stabilization in the determin-istic sense and in several stochastic frameworks have been presented. The results dealt with the case of a discrete channel as well as a packet-based network.
Fuzzy Control of Hydraulic Dynamometer Water Pressure Based on Visual C++
Authors: Li Chang Zheng , Lei Yong
Published: February 2012

In this paper, a fuzzy controller of hydraulic dynamometer water supply pressure was realized by Mamdani fuzzy inference system. The schema of database of fuzzy inference rules and member functions was introduced. An algorithm of fuzzy inference based on VC++6.0 was presented.
Chilled Water Temperature Control of HVAC System Using GPC Based Controller
Authors: Ma Qiang , Lu Jian Gang , Yang Qin Min , Chen Jin Shui , Sun You Xian
Published: February 2012

This work proposes a generalized predictive control (GPC) based controller for the temperature of HVAC chilled water supply. In this paper, several models of evaporator are firstly introduced, wherein an identified black-box model is selected for the purpose of controller design. Based on this model, a GPC based controller is employed to obtain a satisfactory performance even with the presence of disturbance. The theoretical results show the stability of the closed-loop system and the performance of this scheme is compared with that of traditional PID controller under simulation environment.
Wireless Communication System Development of Mobile Robot Based on Embedded Technology
Authors: Liu Xiang Juan
Published: February 2012

Using the broad coverage of Global System for Mobile communications GSM (Global System for Mobile Communication) wireless network, monitoring remote target is one of research hot spots of remote control. The fact of applying the wireless communication technology, embedded processing techniques to remote monitoring system to realize the complete solution of the wireless remote monitoring system has strong industry value and research significance.This article offers a kind of monitoring system based on GSM. With wheeled mobile robots as an experimental platform, once robot detect water, fire, gas leakage or illegal invasion through the sensor, it will report to the householder through the short message in order to take emergency measures. Take GSM network as the communication channels , because it has a series of advantages such as fastness, reliability, low cost, less maintenance costs ,etc
Design of the Comprehensive Experimental Platform for Testing Technology Based on Virtual Instrument
Authors: Chen Guang Jun , Yan Bing Bing , Chen Hai Yan , Guo Wei
Published: February 2012

Virtual Instrument Technology represents the future direction of development of the instrument. At present, it is very popular that Virtual instrument is applied to test technology experiment in developed countries. The virtual integrated experimental platform of testing technology was designed based on the LabVIEW software, including signal generator, signal superimposed meter, digital filters, signal spectrum analyzer, noise signal detection and analysis system. The comprehensive experimental platform can replace the traditional equipment and can easily extend its functionality. It can provide students with a virtual integrated experimental platform.
Research and Implementation on Face Recognition Algorithm
Authors: Ning Xiao Mei , Shi Yan
Published: February 2012

This paper used the PCA based method to build a face recognition system. At first, PAC provided a linear transformation matrix between the high and low dimensional spaces, then multi-dimensional Euclidean distance were used to rebuild residual to reduce the number of the obtained dimensions, speed up and high accuracy, which simplified the process of face recognition. Simulation results proved this algorithm is efficient.
Study on Anti-Bacterial UV Ink with Zinc-Copper
Authors: Huang Wen Tao , Chen Guang Xue , Tang Bao Lin , Yu Ming Guang
Published: February 2012

Packaging security and functionality has been the research focus. In recent years, people pay more attention to the functionality of ink used in packaging. In this paper, a kind of zinc-copper antibacterial agent was made by attached the metal Zn2+, Cu2+ on the zeolite by ion exchange and the zeolite modified was used as a carrier; Than the zinc-copper anti-bacterial UV ink was prepared by mixing and grinding zinc-copper antibacterial agent, polyester acrylate, HDDA, TMPTA, titanium dioxide and other element of UV ink; The UV ink prepared was printed on paper. When the UV ink printed was dried, the property of anti-Escherichia.coli(anti-E.coli) and anti-staphylococcus aureus of UV ink prepared was tested by the anti-bacterial experiment. This study has good application prospect in the area of safety packaging.
Restudy on the Sampling Distribution of Coefficient of Variation for a Normal Population
Authors: Xu Jian Mei , Bai Lun
Published: February 2012

The sampling distribution of the coefficient of variation for a normal population is theoretically deduced, as well as its mean and variance. The conditions under which the mean and variance of the sampling distribution exist are studied, and the affecting factors on the sampling distribution shape are discussed.
A Decision Making Approach for Selecting Inventive Principles from Contradiction Matrix
Authors: Liu Shang
Published: February 2012

Our aim is to propose a decision making approach to help the designer select the inventive principles from the principle set recommended by the TRIZ contradiction matrix. Both citing frequency and authority’s’ advice are considered. Entropy is introduced to help create the decision making criterion which is influenced by the citing frequency of inventive principles, and synthetical criterion is constructed considered both the importance weight of authoritys’ advice and citing frequency. The flow-progress of decision-making is given. Finally, a case study is used to show the validity of the proposal approach.
Modelling Material Behavior of Austenitic Stainless Steel under Monotonic and Cyclic Loadings
Authors: Kumar R. Suresh , Chellapandi P. , Rao C. Lakshmana
Published: February 2012

Mechanical behavior of the austenitic stainless steel under monotonic and cyclic loading at room temperature has been mathematically predicted. Materials like SS 316 LN exhibit cyclic hardening behavior under cyclic loading. Based on the characteristics of yield surface, cyclic hardening can be classified into isotropic and kinematic hardening. Armstrong-Frederic model is used for predicting the kinematic hardening of this material. It is basically a five parameter, nonlinear kinematic hardening model. Cyclic tests for various ranges were carried out to derive the isotropic material parameter required for modeling. Kinematic hardening material parameter required for modeling were computed based on both monotonic tension and torsion tests. By using these parameters the developed program is able to model the mechanical behavior of austenitic stainless steel under monotonic and cyclic loading conditions at room temperature. Comparison of the predicted results with the experimental results shows that the kinematic hardening material parameters derived from the monotonic torsion tests were in good agreement than that of the monotonic tension tests. Also it is recommended to use more material parameter constitutive models to improve the accuracy of the mathematical predictions for the material behavior under cyclic loading.
Anisotropic Behaviour of AZ31B Sheet at High Strain Rates
Authors: Ahmad Iram Raza , Shu Dong Wei
Published: February 2012

The anisotropic effects on the mechanical response of AZ31B sheet at high strain rates have been analyzed. The experimental results indicate that the stress-strain behaviour of the alloy is highly anisotropic and rate sensitive. However, anisotropy of the mechanical properties of the alloy is less significant at higher strain rates. Under tensile loading, the anisotropic behaviour of the alloy is less significant as compare to its behaviour under compression. In both compression and tensile loading the alloy shows significant rate sensitivity as compare to quasi-static strain rates but at higher rates it is less significant. The maximum stress is observed to reach nearly 600 MPa for transverse direction impact. The tension-compression asymmetry is observed in the alloy.
A Method of Fault Diagnosis for Reciprocating Compressor Based on Phase Space Reconstruction (PSR) and Empirical Mode Decomposition (EMD)
Authors: Liu Yan , Yuan Wen , Wang Shi Gang
Published: February 2012

Extract correlation dimension of vibration signal of reciprocating compressor based on G-P algorithm and empirical mode decomposition（EMD）technology, with found mode of EMD de-noise, with the incorporation of method of self-interrelated function and method of pseudo-phase portrait ensure delay-time and calculate embedding dimension by EMD method. Through simulation analysis of Lorenz system, Apply the method to identify valve faults of reciprocating compressor, the result indicate that the modeling method is effective.
Selection of Wavelet Basis for Infrared Face Recognition in Wavelet Domain
Authors: Xia Yan Hui , Wang Zheng You , Wang Wan
Published: February 2012

With the development of science and technology, using biometric technology to implement identification is a wider application especially in the area of E-commence. It receives continuous attention in the period of information security. Among all biometric identification methods, infrared face recognition, being straightforward, passive and non-invasive, can dissolve the problem of light which influence visible-light face recognition. This paper chooses energy imagery for the reason that it is less sensitive to the ambient temperature. What’s more, for the characteristic of energy concentration in wavelet transform, we can reduce the data complexity based on face recognition in wavelet domain. However, various wavelet bases will bring out different results in analyzing. So we select wavelet basis based on infrared face recognition of energy imagery in wavelet domain. The experiments illustrate that adopting the wavelet basis of orthogonally and symmetry can get higher recognition rate.
Developments in Detection of Rock Damage
Authors: Peng Rui Dong , Yang Yan Cong , Wang Peng , Zhang Yu Jun
Published: February 2012

How to quantificationally detect the damage of rocks is a key problem in damage mechanics for rocks, and it determined whether the damage theory of rocks could be brought into action in rock engineering. Detection techniques of rock damage were summarized and grouped into structural analysis approaches and feature measurement approaches, which include SEM analysis, CT detection, stress-strain measurement, wave detection, acoustic emission monitoring, infrared radiation detection, etc. Image processing and fractal theory were introduced to calculate damage variable directly based on images. All kinds of damage variables resulted from different methods are equipollent in thermodynamics, and they are an internal variable to characterize damage state. The difference of each kind of damage variable is that different formations of state equations and dynamic equations would be derived from different variables. It was suggested that the favorable rock damage variables should be selected according to the thermodynamics principle and those convenient to detect and easy to analysis should be adopted preferably.
A Study on the Integrated Modeling of Decoupled Vibratory Feeder
Authors: Han Liang , Yang M.M.
Published: February 2012

Vibratory feeders play an important role in automated systems and the decoupled vibratory feeder is a novel design which is excited in two different directions. The research on decoupled vibratory feeder concentrates on the modeling, the control system and structural optimization. The aim of this work is to focus on the integrated modeling of the decoupled vibratory feeder. The integrated modeling consists of the mechanic modeling, the electrical modeling and the control strategy. The modeling of all modules including the PID control, the power amplifier, the electromagnet, the feeder, the part motion and the feedback are discussed to reveal the relation between the input signal and the part motion. The block diagram of the integrated modeling of the whole system programmed with MATLAB is given in this paper. A deeper understanding of the decoupled vibratory feeder can be obtained by the integrated modeling to optimize the structural design and improve the conveying efficiency.
The Design and Implementation for a Monitoring & Controlling System Based on 3-Teles Technology and Visual Interface
Authors: Li Ting Jun , Shi Yu Da , Zhou Nian Lai
Published: February 2012

Based on 3-TELEs(tele-controlling,tele-metering and tele-communication)Technology, a monitoring & controlling system for reservoir sluices group has been researched and developed in this project.With this embedded system, some real-time simulation data such as the rainfall, the water-level, the flow-level, the sluice opening and closing degree, as well as some equipment running condition data, are collected and analyzed to realize the 3-TELEs controlling, which means that the on-the-spot controlling, the base station controlling, and the remote center controlling can be achieved simultaneously at different place.
A New Method for Dynamic Position Measurement While Drilling String Rotating
Authors: Yang Quan Jin , Zuo Xin , Lin En Huai
Published: February 2012

This paper describes the commonly used for oil drilling directional sensor’s structure and the measured parameters, provides a method for dynamic position measurement while drilling string rotation, detailed analyzes on how to calculate a real time accurate gravity tool face based on a precisely theoretical derivation, and the calculated value by this method verified by experimental results. This article provides a measurement technology solution for any rotary steerable tool developing and it can be applied to such a purpose.
Research on Supporting Force of Several Models of Hydrophobic Plant Leaves
Authors: Wang Qing Cheng , Yang Xiao Dong , Shang Guang Rui , Yang Zhuo Juan , Cao Guo Hua , Xu Hong Ji
Published: February 2012

In this paper, the leaves of 5 kinds of hydrophobic plants including lotus, canna, green poplar, grape and pumpkin were selected, whose contact angles were 150.6º, 135.5 º, 110.4 º, 101.3 º and 94.8 º respectively by contact angle instrument measuring. These plant leaves were adhered to rectangular box by double-sided adhesive tape, as experimental model.The maximum supporting force of these models on water surface were measured by analytical balance, and the supporting force increases as contact angle, the dimple pressed by the model on water surface can increase its supporting force. Through mechanical analysis, the mathematical model of the supporting force was established, the relationship between depth of dimple and contact angle was analyzed by the mathematical model.
Dimensional Stability of Poplar Wood after Densification Combined with Heat Treatment
Authors: Cai Jia Bin , Ding Tao , Yang Liu
Published: February 2012

Hybrid poplar boards were subjected to thermo-mechanical densification combined with heat treatment. Hydroscopicity and hygroscopicity of the treated samples were measured. The results showed that dimensional stability of the samples was influenced by compression set significantly. The higher the compression set, the greater the swelling of the samples. On the contrary, the influence of densification temperature and duration was not significant. Thermal modification significantly reduced hydroscopicity and hygroscopicity of the samples. Both higher treatment temperature and longer holding time resulted in better dimensional stability.
Failure Effects of Tilting Control System on Train
Authors: Zhang Ji Min , Man Li Wen , Zhou He Chao , Yang Kuan
Published: February 2012

The mechanical-electrical coupled dynamic model of the tilting train is established in order to study the failure effects of tilting control system. Four kinds of movement of the driving actuator are compared, specifically including: normal tilting, no tilting, insufficient tilting and tilting on the contrary. The results has shown: when the tilting is insufficient or no tilting, the influence to the dynamic is small, the curve-passing speed reduces obviously; when tilting on the contrary, the dynamic performances of front bogie become worse and the curve-passing speed decreases much more.
Side Scan Sonar Modeling for Maritime Robotic Operations
Authors: Tan Kuan Meng , Lu Tien Fu , Anvar Amir
Published: February 2012

One of the key aspects in designing an Autonomous Underwater Vehicle (AUV) simulation framework is sensor modeling. This paper presents specifically the underwater sonar sensor modeling structure used in the proposed AUV simulation framework. This sensor model covers the mathematical aspects from the field of acoustics which mimics real world sensors. Simplified sonar signal models are widely used however rarely discussed in the literature. Based on this designed simulation framework, simple scenario using different sonar configuration is shown and discussed. This paper shows the formulation of a typical side-scan sonar with emphasis on the assumptions which leads to the simplification of the sonar model. The sonar sensor model is built based on a developed AUV test-bed which was done previously in the University of Adelaide.
Special Problems and Solutions for Numerical Prediction on Longitudinal Motion of Trimaran
Authors: Zhang Wen Peng , Zong Zhi , Wang Wen Hua
Published: February 2012

For the numerical prediction on motion responses and performances of trimaran in regular wave, this paper solves two special problems for trimaran, which include abnormal numerical oscillation for the high frequency motion and obvious stem rising and stern falling due to large variation of navigation posture. On one hand, the authors introduced an artificial viscous force on the free surface between main and side sections to restrain the abnormal numerical oscillation. On the other hand, in order to consider the influence of navigation posture, the authors revised wet surface in motion prediction. Finally, some test cases were calculated and simulated to validate the present method. Compared with experimental data, the results of trimaran model with transom stern show that artificial viscous force has obvious effect on the heave response and small influence on the pitch motion. Furthermore, navigation posture plays a very important role on pitch and little action on heave movement. Especially, for trimaran model with low speed, viscous force and navigation posture basically have no effect on the results of motion prediction.
Measurement of the Irregular Geometric Shapes
Authors: Wang Gang , Huang Norden E. , Hsu Wei Tai , Lo Men Tzung , Qiao Fang Li , Lin Min
Published: February 2012

Image presents the basic physical features of an object. Geometry, on the other hand, provides us a powerful way to quantify the information reflected by images or their shapes. Traditional geometry however finds limitation in describing the differences between highly irregular objects，which requires us to find new approaches to measure an object and quantify its difference from another. In this paper, we define some scalars in two dimensions to meet this demand. These approaches, grounded on circularity, convexity and cavity, describe the geometry of shapes in statistic sense, and they can also be applied to qualify the differences of shapes.
Large Eddy Simulation with Three Kinds of Sub-Grid Scale Model on Temperature Fluctuation of Hot and Cold Fluids Mixing in a Tee
Authors: Lu Tao , Wang Yong Wei , Wang Ping
Published: February 2012

In the present work the temperature fluctuations in a mixing tee were simulated on FLUENT platform using the large-eddy simulation (LES) turbulent flow model with three kinds of sub-grid scale (SGS) models such as Smagorinsky-Lilly (SL) model, Wall-adapted Local Eddy-viscosity (WALE) model, and Kinetic-energy transport (KET) model. The normalized mean and root mean square temperatures were predicted and analyzed with consideration of buoyancy. The numerical results showed that buoyancy greatly influences the mixing flow and the thermal striping phenomena were quite obvious. These three SGS models have somewhat similar accuracies for prediction of the temperature fluctuation and thermal stripping in a tee of mixing hot and cold fluids.
Larger-Eddy Simulation of Velocity Fluctuation in a Mixing T-Junction
Authors: Lu Tao , Liu Su Mei , Wang Ping , Zhu Wei Yyu
Published: February 2012

Velocity fluctuations in a mixing T-junction were simulated in FLUENT using large-eddy simulation (LES) turbulent flow model with sub-grid scale (SGS) Smagorinsky–Lilly (SL) model. The normalized mean and root mean square velocities are used to describe the time-averaged velocities and the velocities fluctuation intensities. Comparison of the numerical results with experimental data shows that the LES model is valid for predicting the flow of mixing in a T-junction junction. The numerical results reveal the velocity distributions and fluctuations are basically symmetrical and the fluctuation at the upstream of the downstream of the main duct is stronger than that at the downstream of the downstream of the main duct.
The Research to Hydrocyclone Desander of Sand Removing Based on Crude Oil
Authors: Feng Ding , Chang Xiao Fei , Zhang Xian Yong , Li Shou Yong , Ruan Chao , Xie Yu
Published: February 2012

The fractional volume of the reservoir sand shall be taken to the ground when the crude oil is brought up from the ground. With the deepening of the oil extraction the sand content of oil recovery is increasing. Although many measures have been used such as prevent sand, block sand and so on, the viscosity of heavy oil is big and the fractional of sand is carried into the crude oil gathering system inevitably, causing a series of problems at ground equipment, having a serious impact on the normal production and gathering of crude oil. The larger size of sand can be removed by the sedimentation and the smaller sand can be removed by hydrocyclone devices. Hydrocyclone is a separation plant used to separate non-uniform phase mixtures. It can be used to complete the liquid clarification and to wash particles, liquid degassing and grit removal, grading and classification of solid particles and the separation of two non-miscible liquids and others. Hydrocyclone separation technique is simple and convenient operation, high separation efficiency, no rotating units, small size and easy to realize automatic control. On the offshore platform，if the sand mixed with oil is discharged into sea unsatisfactory the standard, it will pollute the sea. It will cause a serious of marine pollution; this is a problem that should be solved quickly. This paper discusses the requirements for the design of the hydrocyclone desander equipment with compact structure, applicable to offshore drilling platforms，and carrying out CFD simulation, the results showing that the particle size of 75 of sand, grit removal efficiency above 90%.
Mode Analysis on the Car Body of Special Gondola Car for Coal
Authors: Hong Chun Lei , Geng Yue , Hu Yong Sheng
Published: February 2012

The theoretical principle of mode analysis was introduced. The finite element models of the empty and loaded car body of special gondola car were built, and then the mode analysis and verification of the two models were studied. The results show that the two finite element models of empty and loaded car body of special gondola car are accurate and reliable. Furthermore, a new way is provided to analyze the mode of car body embarked by bulk cargoes, and a solid foundation is laid for further dynamic researches.
The Profile Shaft Connection of Inner Gear with Swing Movable Tooth in Propulsion Mechanism
Authors: Luo You Xin , Li Heng Shu , Wen Hui Jun , Zhou Yu
Published: February 2012

This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the profile curve of the inner gear with swing movable tooth. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get the profile shaft connection of inner gear with swing movable tooth (a keyless joint), then introduce the propulsion mechanism with it. At last, applying Solidworks2010 software, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.
The Research of Drill Propulsion Mechanism with Eccentric Wheel Handspike Roller Movable Inner Gear Profile Curve Shaped-Connection
Authors: Luo You Xin , Li Heng Shu , Wen Hui Jun , Zhou Yu
Published: February 2012

This paper deals with the existing propulsion mechanism, analyzes the disadvantages of the flat key and the spline, studies the features of the eccentric wheel handspike roller movable inner gear profile curve shaped-connection. In an existing chain propulsion mechanism, we change the fit of the inner hole of sprocket gear and the outer circle of intermediate shaft to get a eccentric wheel handspike roller movable inner gear profile curve shaped-connection (a keyless joint), then introduce the propulsion mechanism with eccentric wheel handspike roller movable inner gear profile curve shaped-connection. At last, we create the three-dimensional modeling of the propulsion mechanism, which would lay a solid foundation for the further study. This new propulsion mechanism has such advantages as self-centralizing, easy disassembly, low stress concentration, with a simple fit cross-section, transmitting big torque, suitable for the heavy loads of rock drilling.
The Full Flow of Precise Die Face Design Process for Automobile Die
Authors: Men Chang Feng , Yu Qiang
Published: February 2012

The die manufacturing is very important for the automobile industry. For the die manufacturing process is very complicated the trial-and-error method is still used. In this paper the full flow of precise die face design process for automobile die is studied in detailed. First the primary drawing die face layout is explained. And the initial information for blank formability simulation and primary die surface design is summarized. For the precise die face design process the blank thinning rate and die deformation are studied according to the two simulation results combined. The industrial application shows that the full flow of precise die face design process for automobile die is a good way for decrease the die manufacturing cycle.
An Investigation on Buckling Behaviour of Functionally Graded Plates Using Finite Strip Method
Authors: Ghannadpour Seyyed Amir Mahdi , Ovesy Hamid Reza , Nassirnia Mohammad
Published: February 2012

Semi-analytical finite strip method (FSM) for analyzing the buckling behavior of some functionally graded plates is presented in this paper. The plates are assumed to be under three types of mechanical loadings, namely; uniaxial compression, biaxial compression, and biaxial compression and tension. The material properties are assumed to vary in the thickness direction according to the power-law variation in terms of volume fractions of the constituents. Thus, the material properties are estimated from the both Voigt rule of mixtures (VRM) and Mori-Tanaka homogenization method (MTM). Numerical results for a variety of functionally graded plates with different aspect ratio are given and compared.
Hydrodynamic Performance of Leading-Edge Tubercle Three-Dimensional Airfoil
Authors: Feng Feng , Cheng Xiang Ru , Qi Xiang Yang , Chang Xin
Published: February 2012

Based on RANS method, this paper studied leading-edge tubercle three-dimensional airfoil, which had effect on hydrodynamic performance of three-dimensional airfoil. Both section configurations of the two three-dimensional airfoil models were NACA0020 airfoil. The research method was numerical simulation. First, the leading-edge profile of the first airfoil model was normal. To get stalling angle of the first model, it analyzed hydrodynamic performance of the first model under different angle of attacks at Re=1.35*105. Then, the second model had a sinusoidal leading-edge profile. The second model chose the same Reynolds number. By comparison the numerical calculation results between the first and the second model, the stalling angle of second model delays 3°than the normal airfoil, and the lift coefficient of the second model increases 11.92% than the normal model. The results have laid the foundation for optimization design of leading-edge tubercle three-dimensional airfoil.
Interface Microstructure and Mechanical Properties of SiCp/2014Al Aluminum Matrix Composite Vacuum Brazing Joint
Authors: Feng Tao , Zhang Yong Ang , Yu Zhen Qi , Wang Yin Zhen
Published: February 2012

This paper describes the brazing technique of SiCp/2014Al aluminum matrix composite. The surface reinforcements were partly exposed and the surface was deposited by vapor deposition process. Observing the microstructure of the brazing joint, Cu and M6 aluminum filler metal are more adaptable for the brazing process than Ti and 4047 aluminum filler metal. The tensile strength of the as-welded joint can reach 181MPa. The fractography of the brazing joint indicates that the fill metal can not wet the parent composite, which is the main reason for the loss of strength. Furthermore, the porosity caused by high brazing temperature and the aggregated reinforcement on the parent composite are two other important reasons for the brazing joint strength lost.
Knowledge-Based Manufacturability Evaluation System for Shipbuilding
Authors: Li Jin , Yi Hong
Published: February 2012

Concurrent design requires that the following activities of manufacturing and assembly should be considered during the stage of product design. Ship manufacturability evaluation is one of the most important works in concurrent engineering researches. In this paper, the characteristic of shipbuilding is analyzed firstly, and the architecture of knowledge-based manufacturability evaluation system for ship product is presented, and the key technologies to realize the said system are researched.
The Effect of Polyurethane Hardness on the New Die-Set of Sheet Hydroforming Process Parameters
Authors: Hosseinzadeh Morteza
Published: February 2012

In recent years, several sheet hydroforming methods have been introduced by researchers. Despite the advantages of these methods, they have some limitations. The author [1] already proposed a novel sheet hydroforming method that is a combination of the standard and hydromechanical sheet hydroforming processes. The proposed method has the advantages of both processes and eliminates their limitations. In this method, a polyurethane diaphragm was used as a part of die-set to control the blank holder force. In this paper, the effect of polyurethane hardness on the effective parameters of the combined sheet hydroforming die-set such as forming pressure, thickness distribution of formed cup and maximum thinning zone of formed cup was investigated experimentally. It was shown that a softer polyurethane needs to a higher oil pressure to prevent wrinkling in the flange of the part. And tearing occurs at higher level of forming pressure. Also it was shown that by softer polyurethane, better thickness distribution was obtained.
Investigation of the Effect of Blank Shape on the Sheet Hydroforming Parameters
Authors: Zamani S. Ali , Hosseinzadeh Morteza
Published: February 2012

In the deep drawing processes, the use of an optimal blank shape not only saves the material but also it may reduce the occurrence of defects e.g. wrinkling and tearing. In addition, finding the desirable flange contour, eliminate the trimming step in the deep drawing of parts with flange. The main objective of this study is to optimize the blank shape in order to produce a cylindrical cup with desirable flange contour and investigation of its effect on important parameters. Presently, to overcome this issue, a very expensive and time consuming trial and error method is used. In this study, a systematic method based on sensitivity analysis has been used to find the optimal blank to obtain a desirable flange contour for a cylindrical cup by hydromechanical deep drawing process. With the aid of a well-known dynamic explicit analysis code ABAQUS; optimum initial blank shape has been obtained. With the predicted optimal blank, both computer simulation and experiment are performed and the effect of blank shape on the some parameters such as thickness distribution and forming pressure of the formed cups were investigated. It is shown that formed cup with an optimum blank shape has a better thickness distribution in the rolled direction.
Diffusion Modes of Generic Technologies of Equipment Manufacturing Industry Chain
Authors: Yu Zhong Hai
Published: February 2012

Generic technology plays an important role in sustainable development of industry. This study tries to focus on diffusion mode of generic technology for equipment manufacturing industry. Related characteristics and relationships between equipment manufacturing industrial chain and technology chain are shown. Diffusion and transmission of equipment manufacturing generic technology are summarized and extracted. It is effective in improving diffusion efficiency of generic technology, also is important signification to sustainable development of equipment manufacturing industry. For generic technology diffusion of other industries, it will also play a guiding role.
The Fast Image Matching Algorithm for Building Photogrammetry
Authors: Fu Mao Li , Zhao Can , Cheng Jun Ting
Published: February 2012

SIFT is the most common algorithm for the image local feature points matching. The excellency of it is not only good spatial scale invariance, but also more accurate and faster than other algorithm. However, the SIFT feature points do not reflect the geometric features of objects, so, when dealing with the building images, these points are not available in most cases, and the extraction process is complicated. Therefore, this paper presents a new algorithm that combines the Harris corner detector and SIFT operator. This new algorithm not only can enhance the efficiency of image matching, and make accurate information on the building corner, but also provide good reference information for modeling. Experiments show that the extract feature points of this algorithm can be applied to the three-dimensional reconstruction of large buildings.
Development of Parameter Program for On-Line Measurement Technology Based on Fanuc-18i
Authors: Zheng Shu Hua , Liu Jun Qiang , Shu Xue Dao
Published: February 2012

The purpose of this article is to realize the automatic on-line measurement of work coordinate system using Renishaw probe on the NC machine. We examined the application of Renishaw probe，and we use evolutionary analysis of the typical case to measure the coordinate system of the workpiece, and develops the parameter program. Besides, we experimented with the method based on Fanuc-18i.The related data is recorded in the course of the experiment, and we analyzes the error finally.