bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Co-KZr2(PO4)3-Type Crystalline Purple Ceramic Pigments
Authors: Gu Xing Yong , Luo Wen Qin , Chen Yun Xia
Published: October 2010

Using potassium carbonate, ammonium phosphate, zirconium dioxide, and cobalt oxide as raw materials, a kind of potassium zirconium phosphate ceramic pigments with bright purple color at high temperature were obtained through a series of optimizing experiments. It’s a novel type of ceramic pigments with chromaticity indexes of L*=55.37, a*=18.52, and b*=-30.56. X-ray diffraction (XRD), TG-DTA and chroma analysis were employed to characterize the pigments. The results reveal that potassium zirconium phosphate type ceramic pigments presenting bright purple color is due to Co2+ partially replace Zr4+ in potassium zirconium phosphate crystal lattice, which leads to the lattice distortion because of the formation of Zr2-xCo2x(PO4)3 phase. Moreover, owing to the limitation of solubility of Co2+ in potassium zirconium phosphate crystal lattice, the contents of cobalt oxide added may not be too much.
New Method for Pipeline Leakage Measurement in Pneumatic Industry
Authors: Huang Liang , Cai Mao Lin , Wang Jia Wei
Published: October 2010

The objective of work proposed in this paper is to propose a new method of measuring gas leakage for pneumatic industry. Compared with traditional flow measurements, equipment using this method can be connected to the pipeline in parallel. The measurement is enabled by employing a standard flow. Standard flow is used to determine the internal volume of the measured equipment. An algorithm is formulated to describe, to the extent possible, the relationship between gas leakage and standard flow. This paper also proposes a pressure differentiator that contains a slit-type laminar flow element. The measurement deviates from the theoretical leakage values by less than 5%, and shows a good precision and scope. In addition, the proposed parallel connection based on standard flow makes easy operation and fast measuring possible, thus promising new area of application for pneumatic equipments.
Method of Subjective Lexicon Creation for Chinese Sentiment Analysis
Authors: Zhang Jing , Jin Hao
Published: October 2010

The lack of Chinese subjective lexicon in the study and application of the subjective and emotional information restricts the further development of subjectivity analysis of Chinese words. Based on the current situation of and demand for Chinese sentiment analysis, the method of automatically obtaining subjective lexicon from the target corpus is studied. A creation method of subjective lexicon is presented, the subjective lexicon and language model are defined, a self-adaptive subjectivity bootstrapping algorithm and the characteristic model of subjectivity attribute are designed, and all these lead to the realization of the automatic judgment of sentiment polarity, subjectivity intensity and the subjectivity and objectivity of a word in the subjectivity entry. Experiments prove that by using machine learning the proposed method of automatic creation of Chinese subjective lexicon is highly efficient and with excellent performance.
Method of the Safety Early Warning on Hazard Installations
Authors: Zhang Jing
Published: October 2010

The early warning can improve the monitoring and management of the hazard installations, realize the prevention and control in advance. Many early warning methods do not have the forecast and simulation of the hazard consequences and early warning information is not comprehensive. The hazard installations warning process and hazard assessment technology are analyzed and studied, and qualitative analysis and quantitative analysis are carried out. With the effective combination of hazard consequences and early warning technology, the processing system of hazard installation early warning process information is presented, the hazard installation early warning information processing model is designed, the hazard installation early warning is improved, and the accuracy and efficiency of early warning is improved. With examples, the hazard consequences of leak and diffusion are simulated. Experiments prove that the early warning simulation structure and early warning method are effective, and that the simulation results are close to the actual situation with better application value.
Sealing Structure Design and Analysis of Non-API Pipe Connection
Authors: Xu Zhi Qian , Yan Xiang Zhen , Yang Xiu Juan
Published: October 2010

In this paper, the main design parameters of seal structure for non-API pipe connection are studied. First, as the total contact pressure consists of the radial preload generated by interference fit and the radial pressure caused by gas pressure in pipe, the variation laws of their values changing with the sealing diameter are analyzed. The sealing diameter value which maximizes the total contact pressure can be obtained from the derivation formula for calculating the total contact pressure. Second, considering the yield condition of pipe connection under the internal and the external pressures, the minimum wall thickness of the seal structure is derived. Then the cone angle is calculated by the sealing length and the minimum wall thickness known. Finally, take the 7in casing connection for example, the main design parameters are calculated by the above analysis.
Study on the Enrichment Degree of Coalbed Methane Based on the Fuzzy Comprehensive Evaluation
Authors: Yan Xiang Zhen , Wang Bao Hui , Yang Xiu Juan
Published: October 2010

Considering the various influencing factors of enrichment of coal bed methane, the evaluation indexes of enrichment for coal bed methane are determined. The weight values of all factors indexes are given and the fuzzy mathematics model is established on the basis of the fuzzy mathematics. As a case study, the fuzzy mathematics model is applied to the assessment of enrichment of coal bed methane. The results show that the No.5 coal seam of Shan 2 of Shanxi formation in Daning-Jixian is a better enrichment area. The evaluation result performed on the basis of the fuzzy mathematics model is in good agreement with the measured result. The example indicates that the method is credible and has high precise. The assessment system established in the paper can be regarded as a reference model in coal bed methane exploitation potential assessment.
FEM Simulation on the Structural Reliability of Beam Pumping Unit Based on the Methods of Monte-Carlo
Authors: Yang Xiu Juan , Yan Yong Li , Xu Zhi Qian , Yan Xiang Zhen
Published: October 2010

In order to know something about the structure reliability of beam pumping unit, the methods of Monte-Carlo and response surface method are used to analyze the pumping unit. According to the analysis and calculation, the approach of how to calculate and analyze the reliability of complex structure is obtained. The results show that using the method of reliability can make the pumping unit more reliable and reveal the components of pumping unit more clearly which can make the design of pumping unit more reasonable.
Electro-Hydraulic Servo Control Based on CMAC Neural Network for Excavating Robot
Authors: Dai Qun Liang , Dai Hong Liang , Qu Xiao Hai
Published: October 2010

In this paper the electric-hydraulic servo system for excavating robot is analysed. The kinematic and the dynamic model of working equipment are established. Aim at the electric-hydraulic servo system of the feature with many variables, strong coupling and non-linear, the CMAC neural network was presented combined with popular PD algorithm, which could realize intelligent control for the working equipment of excavating robot. The result of simulation show that control strategy features higher precision and robustness.
Corrosion and Oxidation Resistance of Electroless Ni-P-Al2O3 Composite Coatings on Carbon Steel
Authors: Sun Wan Chang , Tan Ming Feng , Lu Jian Hua , Zhang Lei , Zhou Quan
Published: October 2010

Electroless Ni-P and Ni-P-Al2O3 composite coatings on low carbon steel (Q235) sheets were prepared by adopting optimum plating process. The cross-section morphology and structure as well as the phase transformation of the composite coatings were studied by scanning electron microscopy(SEM), X-ray diffraction(XRD). It was shown that the Al2O3 particles homogeneously dispersed in the entire Ni-P film matrix, and the structure of Ni-P-Al2O3 composite coatings as deposited was amorphous. The corrosion behaviors were evaluated by electrochemical tests. The experimental results indicated that the corrosion resistance of Ni-P-Al2O3 coatings was superior to Ni-P coatings due to the effect of Al2O3 particles. In addition, the oxidation resistance test, which was carried out by using oxidation weight method, showed that ternary Ni-P-Al2O3 composite coating had a better oxidation resistance than Ni-P coating.
Research on Optimization for Pneumatic System’s Air Supply
Authors: Kong De Wen , Cai Mao Lin , Sun Tie Yuan
Published: October 2010

In this paper, based on the new concept air power of pneumatic system’s energy consumption, we proposed series of practical program to optimize the air supply system. This program discussed a method of how to keep air pressure stable and how to make the amount of air compressors to match the real-time air consumption after using different air pressure for different devices, thus reducing energy loss of air supply system and energy consumption of air compressor group. The result of present work implied that this program achieved the desired effect of energy saving and provided a reference for energy-saving pneumatic system’s design.
Study on Physical Mechanism of Metal Magnetic Memory Technique
Authors: Wu Da Bo , Xu Min Qiang , Li Jian Wei
Published: October 2010

The evaluation of stresses in engineering structures to provide early indications of stress status is a fast growing area in non-destructive testing. Metal magnetic memory technique is the magnetic stress measurement technique for ferromagnetic materials using passive magnetic fields to monitor changes in the magnetic properties of materials. This paper studied the physical formation process of metal magnetic memory effect. This paper studied the physical mechanism between stress and magnetic field in metal magnetic memory effect, through the influence of stress-induced magnetic anisotropy on magnetization process of ferromagnetic crystal.
An Integrated Management Control Information System for Mine Production Based on Three-Tiered Structure
Authors: Ji Zhi Gang , Liu Ling Xi
Published: October 2010

As the supporting means for the development of enterprise, the construction of management control information system requires to be improved and upgraded continually in accordance with the development of China mine enterprises. Facing to China mine enterprises, the management control information system of production and operation based on three-layer structure is an integrative solution by combining management and control. The three-layer structure includes Enterprise Resource Planning (ERP), Manufacturing Execution System (MES), and Process Control System (PCS). Composed by inter-related systems of PCS, MES and ERP, the comprehensive and automatic system architecture can integrate them as a whole through the promotion of control technology, computing technology, and optimization technology, and can achieve the comprehensive application of mine information, control effectively the operating costs in mine production, improve production and management efficiency, enhance the core competitiveness of enterprises, and enable the production and operation management of mine enterprises to make a substantial step up.
Temporal Inference and Simulation in Collaborative Design Process Based on Time Petri Net
Authors: Guo Yin Zhang , Zeng Jian Chao
Published: October 2010

Complex manufacture collaborative design process is a dynamic process with uncertainty, which is a process with multi-task executing in a parallel manner. It has obviously time constraint, which has been few studied up to now. Temporary inference and simulation problem for complex manufacture design process are mainly studied in this paper. Firstly, a Petri net model for collaborative design process is proposed based on time Petri net theory and four temporary inference algorithms of ordering, paralleling, selecting and circling structures in collaborative design process. Secondly, the authors design and develop a visually modeling and simulating circumstance for collaborative design process temporary inference based on time Petri net. Temporary inference for the whole collaborative design process and optimization to design task can be implemented by this simulation software. Finally, collaborative design process for driver of chain-transportation-driven equipment is undertaken to shown the efficiency of the proposed method. Research in this paper affords a determinant principle for time arrangement of collaborative design task and it also affords schema scheduling.
The Study on Horizontal Evaluation for Low-Tech Manufacturing Industry in Chinese
Authors: Ji Zhi Gang , Niu Gai Fang
Published: October 2010

China is relatively successful in the development of LTMI. Both theory circle and business circle should pay extensive attentions to the development and innovation issues of LTMI. In 2002, China’s amount of exports made up 6.1% of the global value, while its proportion of low-tech (incl. middle-tech) manufactured products in global exports was up to 22.3%. In this paper, the efficiency of technological innovation in Chinese LTMI and its concrete industries are evaluated and ranked, and the reasons of gap in efficiency among industries are analyzed. This research view is more specific for the further development of different technology industries in China’s manufacturing industry and the determination of relevant policies.
Detection of Crack Growth Rate in 45 Steel by Metal Magnetic Memory
Authors: Wu Da Bo , Xu Min Qiang , Xing Hai Yan
Published: October 2010

It is important that monitoring the fatigue crack propagation in engineering. This paper studied crack growth rate with the metal magnetic memory technique. Three-point bending fatigue tests of center-cracked specimens were carried out and the normal component of magnetic field signals Hp(y) on the surface of specimens were measure by TSC-1M-4. The correlation of crack growth rate da/dN and metal magnetic memory normal signal Hp(y) was studied. The specimens, with different heat treatment, quenching and thermal refining, were tested in fatigue-testing Machine to study the influence of heat treatment on the metal magnetic memory signal Hp(y). The curve of da/dN ~ Hp(y) was built.
Development of Wireless Resistance Strain Gage Based on ATmega16
Authors: Liu Cai Xia , Gong De Li
Published: October 2010

Measuring a large amount of parameters of work piece, resistance strain gage will have to use many resistive signal conversion boxes and long electric wires. Data acquisition becomes slow, inaccurate and discontinuous. Disorder and thermal of contact potential in the contacts affect the measurement signal and converting precision. In this paper, a wireless portable resistance strain gage is developed. ATmega16 is an 8-bit embedded and high-speed AVR single-chip microcomputer with 16k FlASH, and that is the core of system. Amplifier is designed to amplify and filter micro-voltage signals to improve measure accuracy. Wireless Bluetooth technology links ATmega16 and PC. Visual Basic software displays and processes data from ATmega16 in real time. This system is small in size and highly reliable, strong anti-interference ability and better economic performance.
Incorporating Stakeholder Perspectives into Collaborative Product Design
Authors: Rong Zhi Jun , Chen Kui Sheng , Ying Bao Sheng
Published: October 2010

Collaborative product design is a multiple criteria group decision making process bringing different and often controversial points of view together to create a solution among stakeholders. Collaborative design possesses more perspectives than any single person possesses because stakeholders have different perspectives. This work is based on new decision approach that includes creating shared understanding among various stakeholders, contextualizing design criteria and perspectives, and creating a multiple perspective and multiple criteria decision approach, our initial effort has focused on incorporating perspectives into design process. We then provide the approach to find the optimal design decisions for consideration of stakeholders’ perspectives. By analyzing the relationships between stakeholders’ perspectives and preferences of design criteria, multi-criteria decision making approach considering the stakeholders’ perspectives can be used to monitor and control the collaborative design process.
A Research of Apparatus and Optimal-Control Theory on Precision Seeding in Forestry
Authors: Lv Guang Hui , Liu Jin Hao , Wang Dian , Wang Nai Kang
Published: October 2010

After analyzing and studying the existing sowing operation in forestry, a set of technological process of precision seeding based on optimal-control theory has been put forward and the prototype has also been designed and produced. This paper presents the general structure of the apparatus and analyses the working principle. An adjustable cell wheel feeding apparatus is designed to solve the problem of the uniformity of seeding. The theories of cooling mulching without adhesive on nutrition membrane and the process of membrane mulching are analyzed to set up the pressure model of the roll. After the experiments on the pressure of the roll and the analysis of the data, by the calculation of axial pressure transfer coefficient of the roll, has determined the best pressure of membrane mulching. At last, the test conditions of the prototype show that the frequency of failures is decreased, the damage rate of seeds is reduced, the seeding precision is improved, which satisfy the requirements of technical regulation on seeding in forestry and is beneficial to improve utilization ratio of good seeds.
Research and Development of Multi-Function Excavator Drill with Hydraulic Rotary Cutting and Pneumatic Impacting
Authors: Luo You Xin , Li Yan Geng , Li Heng Shu , Wen Hui Jun
Published: October 2010

To solve the existing shortage of cutting drill, a multi-function excavator drill with hydraulic rotary cutting and pneumatic impact was invented on the base of market investigation, which is suitable for different rocks because of combining hydraulic rotary cutting with pneumatic impacting. If working on the soft rock, the new drill will turn off the pneumatic rock drill, replace the drill bit and only operate with the rotary power head, while on the hard rock it will operate efficiently with the rotary power head and the pneumatic rock drill. The new drill has many features, such as compact structure, the capacity of meeting a variety of drilling requirements, wider operating range, lower energy consumption, higher drilling efficiency, comfortable and flexible operation, and lower cost.
A Study on the Structures and Properties of B-Bearing Cast Steel for Wear Resistance
Authors: Jiang Zhi Qiang , Feng Xi Lan , Feng Xian Zhang
Published: October 2010

The microstructures of B-bearing cast steel containing 0.8-1.2 wt.%B, 0.8-1.2 wt.%Cr, 1.0-1.5 wt.%Mn, 0.6-1.0 wt.%Si and 0.10-0.25 wt.%C have been characterized by means of optical OM, SEM, EPMA and XRD. The solidification structure of B-steel consists of pearlite, ferrite, martensite and boride (Fe2B), while the hardness is 1430-1480 HV. Borides distribute along the grain boundary in the form of eutectic. Fine lath martensite and eutectic Fe2B can be obtained by water quenching at 1223 K-1273 K. The hardness and impact toughness of the B-steel exceed 55 HRC and 150 kJ/m2, respectively. The abrasion resistance determined using a pin abrasion tester is obviously higher than that of the martensitic cast steel and nears to the high chromium white cast iron.
Investigation of Granulated Metal Fabricated by Short Flow Casting Technology
Authors: Jiang Zhi Qiang , Feng Xi Lan , Feng Xian Zhang
Published: October 2010

A casting granulated metal equipment by a short flow was developed, which is comprised of pre-heating chamber, heating furnace, ceramic pipe used to transport the molten metal, the holding furnace, the drip nozzle and the cooling tank etc. The equipment can accomplish preheating the ingot, melting, holding temperature and the polluting at the same time. The preheating temperature of ingot is 100-120 °C. After the ingot is melted, the molten metal is transported to the holding furnace from the melting furnace by ceramic pipe, and the temperature in the holding furnace is 25-28 °C above the melting point of meta1. And the dwell time of granulated metal is 10-18 seconds in the cooling water box. Finally the granulated metal is directly delivered to the packing box by the bucket elevator. The granulated metal produced by a short flow has lower energy consumption and higher efficiency, and the energy consumption is 15-20% lower than that of the common flow.
Investigation and Application of Cold Extrusion Forming Process in Die Structure Design of Plug Extremity
Authors: Jiang Zhi Qiang , Feng Xi Lan , Feng Xian Zhang
Published: October 2010

a cold extrusion forming process in die structure of plug extremity is analyzed in this paper, its technological data on the tooling structure design of plug extremity are discussed, and the die architecture design and key technology in the automatic extrusion machine for plug extremity with cold extrusion forming approach were accomplished. This plug extremity equipment developed with cold extrusion forming process technology can not only achieved the process of delivering material, extruding forming and cutting-off material in automatically, but also enhanced the rigidity and intension at two ends of plug. The production efficiency and the material used ratio were increased greatly, the manufacturing cost was decreased obviously, and the plug quality with cold extrusion forming method was ensured.
Numerical Analysis of Friction Distribution in the Rod Rolling Process
Authors: Yang Li Cheng , Qing Shang Le , Huang Xuan , Luo Yi Ping
Published: October 2010

The three dimensional finite element models of rod have been built on the basis of thermo-mechanical coupled elastic-plastic FEM in order that the rolling process of No.5 pass is simulated accurately. The distributed rule of friction is calculated and discussed with variable initial rolling temperature, diameters of rollers, reduction in pass and rolling speeds. The results show that the fore sliding region, adhesive region and back sliding region are existent on the surface of rolling material. Furthermore, friction force is calculated by using numerical simulation method and it is a new approach in studying friction. The analysis of friction force is available for reference to optimize processing parameters in the rolling process.
A Secure and Efficient Buyer-Seller Watermarking Protocol
Authors: Fu Ling Yun , Hu De Fa , Wang Xiao Ling , Chen Jian Li
Published: October 2010

A number of different buyer-seller watermarking protocols have been proposed to address preserving the rights of both the buyer and the seller. However, these existing schemes are inefficient and impractical for their high computation and bandwidth overhead. To this end, we propose a new buyer-seller watermarking protocol, where the multimedia data is encrypted using a symmetric cipher, and the public-key cipher is only used to key exchanging and data signing. Compared with the existing schemes, our scheme requires a lower computing power and communication bandwidth. In addition, some main drawbacks of those previous schemes are overcome in our scheme.
Ball-End Cutter Machining Process Analysis in Five-Axis Milling
Authors: Li Zhen , Yan Bing
Published: October 2010

In this paper, the three dimensional geometrical analysis is depicted with the interacting relations among cutting edge, undeformed chip and shear zone along cutting direction, and a general geometrical model of five-axis machining curve surface in ball-end milling is presented. A general force model is derived, and the three dimensional cutting forces are predicted. The influences of different angle of the centerline of the cutter to the cutting forces are considered. The three dimensional cutting forces are applied to construct and analysis the structural vibratory model of the system.
A Method of WAV Broadcast Using the I2S of LPC2300 Series ARM Chipset
Authors: Song Juan Juan , Liu Jun An , Tan Ji Qiu , Huang Ju Sheng
Published: October 2010

I2S (Inter-IC Sound Bus) is one of the general audio buses applied in various industrial or embedded systems. It only processes the audio data, while other signals like various codes and control signals are transmitted individually. This paper presents an approach how to construct an embedded audio system using the I2S bus to connect relevant supporting code chip and decode chip. This system can reduce the consumption of system resources drastically, therefore fluent WAV broadcast can be guaranteed. Moreover, the familiar media files, such as MPEG1, MPEG2, MP3, MPEG4 can be played through adding its decoder. The ARM chipset of the LPC2300 series is applied in this system, therefore, system’s reliability can be improved. This method can be wiedly used in vehicle- borne, ship-borne embedded flash players and portable media players.
A Multi-Layer Trust Management in Open Networks
Authors: Guo Yi Min , Guo Ya Jun
Published: October 2010

Open networks are always changing and unpredictable. The new trust management mechanisms will be needed in dynamic networks environment to ensure the open networks. A new trust management is proposed in this paper which trust is divided into two layers: network connection trust layer and application trust layer. Network connection trust layer is the foundation. If there is no network connection trust layer, there is no application trust layer. The trust relationship between each peer layer includes the basic trust and experience trust. Experience trust value is evaluated by fuzzy theory and a new connect operator and merge operator is presented to fuzzily evaluate the recommend trust value. Result shows that this trust architecture is suitable to establish trust relationship among principals and make a new secure solution in open network environment.
T-S Fuzzy Model-Based Fault Diagnosis of PEM Fuel Cell Engine
Authors: Quan Rui , Quan Shu Hai , Huang Liang
Published: October 2010

Proton exchange membrane fuel cell(PEMFC) technology has been greatly promoted in recent years, but the fault diagnosis and predictive maintenance are unneglectable issues in practical work. According to the safety and reliability requirement of 60kW automotive fuel cell engine designed by our group, a fault diagnosis method based on T-S fuzzy model which is tuned and optimized thanks to particle swarm optimization is put forward in this paper. Its inputs include voltage, the lowest single cell voltage, current, temperature and air pressure, by setting the output threshold of T-S fuzzy model at 0.85,when the healthy degree and its variety rate are below 0.85 and 0.05 respectively, the flooding fault is distinguished, if the healthy degree is below 0.85 but its variety rate is above 0.05,drying of the proton membrane is on-line diagnosed successfully, which can provide a guidance to its real-time monitoring and optimized control in future.
Scene Detection in Videos Using Mutual Information
Authors: Huang Shao Nian , Zhang Zhi Yong
Published: October 2010

In this paper, the new detection algorithm of scene detection based on mutual information has been presented. Our approach first detect shot boundary using mutual information. Then key frames are selected from different shots. To cluster similar shots into groups, we present a novel clustering method based on mutual information. Experiments on test video indicate that the proposed scene detection method accurately detects most of the scene boundaries while preserving a good tradeoff between recall and precision.
An Efficient Genetic Simulated Annealing Association Rules Method
Authors: Cen Jun Jie , Gao Guo Hong , Wang Ying Jun
Published: October 2010

Association rule is one of the important models of Web mining. By analyzing the topology of web site, this paper brings forward an efficient genetic simulated annealing association rules method．It applies genetic algorithm，incremental mining technology to trace users access behavior and optimizes association rules，and forecast capable association rules which improves its precision．Finally, this paper gives out the data analysis of experiment and summarizes the characteristics of genetic mining．
An Efficient Multi-Hop Clustering Routing Algorithm in Wireless Sensor Networks
Authors: Xu Li Jun , Gao Guo Hong , Li Xue Yong
Published: October 2010

Since the energy supply of a sensor node is limited, energy optimization should be considered as the key objective when studying the overall network design problem in wireless sensor networks (WSNs). In this paper, we proposed a distributed energy-efficient clustering algorithm in WSNs based on multi-hop theory. We compare the proposed algorithm with different clustering methods used in the WSNs. The simulation results show that the proposed algorithm has the better performances of energy-efficiency, higher throughput and low delay.
P2P Technology Application and Research of Grid Computing
Authors: Gao Guo Hong , Xu Li Jun , Yang Xian Feng
Published: October 2010

Grid computing is a new type of network computing platform emerged after the World Wide Web, which objective is to provide a kind of infrastructure that shares all kinds of information for user． This paper brings forward a Grid-P2P model based on Peer-to-Peer computing, and designs a peer-to-peer genetic scheduling algorithm. The simulation results show that this model increased validity and accuracy of grid computing. It can be applied to the optimization of task scheduling successfully.
Preparation and Mechanics Properties of MR Elastomers Based on Silicone Rubber
Authors: You Hong , Bai Quan , Liu Ying Chun , Ning Li Wei
Published: October 2010

MR elastomers, which consisting of silicone rubber and carbonyl iron particles, are prepared under different magnet fields intensity. Their micro-structure and mechanics properties are investigated and compared. Results show that the bearing capacity and stiffness of both MR elastomers will increase when subjected to a magnet field. But the controllable range and comprehensive properties of the MR elastomers prepared with magnet fields are better than what of the MR elastomers prepared without magnet fields.
Transient Performance Simulation of Single-Cylinder Engines Based on Tribology Behaviors
Authors: Zhao Jian , Tang Bin , Tang Yun Bang , Qi Kun Peng , Ma Er Lin
Published: October 2010

The transient performance of engines is investigated in this paper. A mathematical model of single-cylinder engines is established and the friction torques produced by crankshaft bearing, piston assembly, pumping loss and other major factors are modeled. A dynamic simulation system is developed based on the MATLAB Simulink environment. Friction torques and instantaneous motion characteristics of the engine are predicted. The results show that crankshaft bearing, piston assembly, and pumping loss have a major effect on the transient performance of the engine, and the models described in this paper provide an effective tool to simulate engine processes.
Coupled Vibration Analysis of a Fluid-Filled Pipe by Wavenumber Prediction
Authors: Yan Jin , Zhang Shi Liang , Zhang Juan
Published: October 2010

The stability and vibration of fluid-filled pipes are important in many engineering situations and have been extensively studied. In this paper, coupled fluid–structure analysis is carried on by wavenumber prediction. Pipe equations for axisymmetric wave motion are derived, and two kind of axial waves are studied analytically at low frequencies, i.e., , which is a predominantly fluid-borne wave, and , is predominantly a shell wave. Numerical results are subsequently given to show the definitely influence of the pipe and the fluid.
Investigation on Energy Absorption Characteristics of PVB Laminated Windshield Subject to Human Head Impact
Authors: Liu Bo Han , Zhu Meng Yi , Sun Yue Ting , Xu Jun , Ge Dong Yun , Li Yi Bing
Published: October 2010

In this paper, energy absorption characteristics of PVB laminated windshield subject to human head impact are studied. SHPB method is carried out to obtain the constitutive relationships of PVB laminated glass in dynamic behavior. With the SHPB results embedded, finite element simulation is used to study the dynamic behavior of PVB laminated windshield. In particular, energy absorption characteristics are investigated. Two parameters for measuring the energy absorption property of windshield are suggested, i.e. loss of head velocity and HIC value and a parametric study is carried out to see the effect of impact velocity and impact position. Results can shed lights on the research of energy absorption capability of PVB laminated windshield.
Porting of EtherCAT Soft Master and Developing of a New Type of Open Motion Controller
Authors: Ma Chun Min , Yang Jian Wu , Fei Ren Yuan
Published: October 2010

It is an expectation of most of the numerical control products manufacturer that have a powerful controller with whole won intellectual property and without restriction from other companies. The paper introduces a new type of motion controller that based on ARM and EtherCAT field bus. It concludes the analysis and porting method of the EtherCAT soft master source code, and how to modify the driver of dm9000 to make EtherCAT master works correctly. It also gives an example to confirm the reliability of the controller. Since ARM has an open architecture, EtherCAT soft master does not depend on any special hardware card, and Linux OS is an open source system, this controller has open and flexible characteristic both on hardware and software.
Entire Contact Design Theory for High Performance Drum Brake
Authors: Xu Ying Qiang , Zhang Qiong Wei , Wang Lei Lei , Jin Shao Jie
Published: October 2010

Drum brake is a braking part which is widely used on heavy truck. The distribution and dimension of contacting pressure and contacting area between friction linings and brake drum have important influence on braking performance. Entire contact theory in this article was found based on the conditions that the outside radius of linings was equal to the inside radius of drum. The relation between the corresponding points on contact surface and the angle which lining rotated around support pin axis was calculated based on entire contact theory. The radial deformation, pressure distribution, contact area of linings and the brake performance were analyzed in the condition of entire contact theory.
Software Design of On-Line Measuring System
Authors: Sun Hong Qiang , Yang Mei , Cui Jing Hua
Published: October 2010

This paper is based on the on-line measuring system which is made up of machine center, probe and computer. First it introduces briefly on-line measuring system, then analyses information flow model and construct of the system, using VC++6.0, ACCESS database and OOA design idea compile the software. At last, we carry through an experiment using the software system and coordinate measuring machines validate the result.
Mechanical Property Analysis of Micro-Contact Resistance of Surface Coating
Authors: Xu Ying Qiang , Wang Lei Lei , Lin Fu Hua
Published: October 2010

Mechanical property of coating under the micro-contact load such as impact and sliding wear significantly influence the reliability of surface coating. In order to research the influence, a contact model between the rigid multi-asperity surface and coating was found based on the G-W model in the background of Thermal Barrier Coatings(TBCs) used in aircraft engine blade. The distribution of stress in subsurface of the micro-contact process was analyzed based on the theories of contact mechanics and tribology with the elasto-plastic finite element method. The effect of coating thickness, elastic modulus, yield strength on the distribution of residual stress for TBCs was investigated. It conclude that primary reason of coating failure are cumulation of plastic deformation and excessive interfacial stress. The results are significant for studying the life and final spallation of TBC system and other coating.
A Study on Objective Functions for Springback Control in Multi-Objective Optimization of Sheet Metal Forming Process
Authors: Yang Xiang An , Ruan Feng
Published: October 2010

Nature of springback in sheet metal forming was analysed in the study, two stress-based objective functions were established to evaluate springback respectively from the stress point of view in an optimization problem aimed to reduce springback. To evaluate springback more comprehensively, multi-objective functions including a stress-based and a strain-based objective function were applied. Results show that when acting in conjunction with strain-based objective function, objective function which is defined on stress component deviation through thickness direction has perfect performance, while objective function which is defined on equivalent stress deviation through thickness direction would work well only when degree of plastic deformation is large for the stamped part. To evaluate the influence of stress position on springback, the parametric coordinate of integration point in thickness direction was also employed as weight factor for those two stress-based objective functions. Accuracy of the proposed two objective functions was also compared with the traditional objective function which is defined on the corresponding nodal distance of the shape before and after unloading.
Life Cycle Assessment in Different Product Design Stages - A Coffee Pot Case Study
Authors: Yu Sui Ran , Zhang Rui Bin
Published: October 2010

This paper presents a life cycle assessment (LCA) method in different design process. This method can help product designers to make more environmental friendly design decisions in the design process. In this method, product’s LCA model is established in product conceptual design phase with the aid of decision matrix. Thereafter, the model is improved in the latter design phases, especially in product detail design phases. In this process, with the help of LCA software, designers can evaluate different design options and get LCA results when necessary to guide the design process. Finally, a case study of designing a coffee pot is provided in this paper to illustrate the efficiency and effectiveness of this method. The case study shows that the method performs very well in the design process. It can be used to help designers to make more environmental friendly design decisions.
Bearing Fault Diagnosis Based on Multi-Sensor Information Fusion with SVM
Authors: Li Xue Jun , Yang D.L. , Jiang Ling Li
Published: October 2010

This paper proposed a fault diagnosis based on multi-sensor information fusion for rolling bearing. This method used the energy value of multiple sensors is used as feature vector and a binary tree support vector machine (Binary Tree Support Vector Machine, BT-SVM) is used for pattern recognition and fault diagnosis. By analyzing the training samples, penalty factor and the kernel function parameters have effects on the recognition rate of bearing fault, then a approximate method to determine optimum value are proposed, Compared with the traditional single sensor by using the components energy of EMD as feature, the results show that the proposed method in this paper significantly reduce feature extraction time, and improve diagnostic accuracy, which is up to99.82%. This method is simple, effective and fast in feature extraction and meets the bearing diagnosis requirement of real-time fault diagnosis.
Secondary Development of DiTeSt-STA202 Based on Delphi and Access
Authors: He Kuan Fang , Zhu Ping Yu , Li Xue Jun , Xiao D.M.
Published: October 2010

Distributed optical fiber sensing technology in the dam safety monitoring has been applied. The most typical application is the Swiss distributed optical fiber DiTeSt-STA202 analyzer. The instrument can simultaneously measure the distribution of thousands of points in a fiber strian and temperature, and it is suitable for measurement of objects up to several kilometers, but it’s functions limit to the data acquisition and the most primitive conversion of the strain and temperature without the deeper data processing functions, and the interface is less of user-friendly nature and poor adaptability. In this paper, The secondary development of DiTeSt-STA202 is done by Delphi and ADO technology based on analysis of the data storage types and formats. The data processing and analysis system is achieved in an efficient and accurate way.
Modeling and Analysis of Arc Weld Inverter Based on Double Closed-Loop Control
Authors: He Kuan Fang , Wu Ji Gang , Li Xue Jun
Published: October 2010

According to the soft-switching pulsed SAW (Submerged arc weld) weld power supply based on the double closed-loop constant current control mode, a small signal mathematic model of main circuit of soft-switching SAW inverter was established by applying the method of three-terminal switching device modeling method, and the mathematic model of double closed-loop phase-shift control system circuit was established by applying the method of state-space averaging method. Dynamic performance of the inverter was analyzed on base of the established mathematic model, and the tested wave of dynamic performance was shown by experimentation. Research and experimentation show that relation between structure of the power source circuit and dynamic performance of the controlling system can be announced by the established mathematic model, which provides development of power supply and optimized design of controlling parameter with theoretical guidance.
Modelling of Variation Propagation for Multi-Operational Machining Processes Based on Perturbation Vectors
Authors: Wen Z.J. , Zhu Ping Yu , Zhang X.P. , Liu H.C.
Published: October 2010

A new state space model of multi-operational machining processes is presented for dimensional variation propagation, transformation and accumulation based on perturbation vectors (PV). Taking perturbation vectors (PV) for state vectors of part geometric variaton and the fixture variations for input vectors, the perturbation homogeneous transformation (PHT) is applied to analyze and derivate datum-induced deviation, re-location deviation, fixture error and machining error, and a state space model of variation propagation in multi-operational complicated machining processes is developed. Furthermore, a three-operation machining process of cylinder is given to illustrate the method presented. With the results of calculation and simulation, it is verified that the proposed model is effective and useful.
Fault Diagnosis of Roller Bearing Based on Bispectrum Estimation and Fuzzy Cluster Analysis
Authors: Jiang Ling Li , Liu Yi Lun , Li Xue Jun , Chen Anhua
Published: October 2010

Performing bispectrum analysis on the actual measured vibration signals of the roller bearing with different failure modes, it developed that the spectrum distribution regions are similar among the same failure modes, and distinguishable among the different failure modes, thus this character can be used to classify fault types. The binary images extracted from the bispectra are taken as the feature vectors. The fuzzy clustering analysis based on objective function is applied for pattern recognition, which makes use of the binary image to construct a core and a domain representing the common and scope of bispectrum distribution, respectively, then constructs the objective function as the classify to achieve pattern recognition and diagnosis. The roller bearing fault diagnosis is performed as an example to verify the feasibility of the proposed method.
Measurement and Analysis on Cell Morphology of Polycarbonate Foam in Different Processing Parameters
Authors: Li Bing , Nan Qiao Zhou , Shi Bao Shan , Qin Xue Mei
Published: October 2010

The purpose of this research is to analysis on cell morphology of PC (Polycarbonate) foam in different processing parameters. In this study, foamed PC was produced using a dynamic simulation foaming setup designed by ourselves. Cell morphology was compared as different temperatures, pressures, gas saturation time, pressure drop rates and different shear rates were used. Cell morphology of foamed samples was measured by using scanning electron microscopy（SEM）. It was found that foamed samples with better morphology could be obtained as pressure, pressure drop rate and gas saturation time increased.
Study and Application of Electrical Detecting Technique to Hidden Defects in Weihe River Dikes
Authors: Leng Yuan Bao , Zhao Shou Gang , Zheng Guang He
Published: October 2010

Due to various reasons, the inherent quality for Weihe River dike remains poor. There are many hidden defects in dikes, such as cracks, holes etc. so that the actual flood protection ability of dikes is low. And it is difficult to resist the impact of the design flood. In order to ascertain the number, distribution and depth of these hidden defects, etc., electrical detecting technique was applied and studied for detection of hidden defects. At the same time, in order to verify the correctness of the detection results of hidden defects, the engineering geological survey for the purpose of verification was carried out on the detection dike sections. Survey results confirmed the reliability of detection conclusions.
Analysis of Deformation and Stress-Strain Monitoring for Changma Dam
Authors: Zhao Shou Gang , Zhang Jun Xia , Qiao Rui She
Published: October 2010

In order to supervise the safe operation of the Changma dam, to test design, to validate construction quality and run behavior, to monitor accidents as well as the accumulation of information on evaluation of the dam's future behavior and so on, the deformation and stress-strain of reservoir dam are carried out safety monitoring. Monitoring results show that the development of settlement deformation is still increasing, and have not yet reached a relatively stability according to the development trend of the settlement process. Lateral deformation of the dam isn’t abnormal phenomenon, and accords with the general laws of dam deformation. The compressive stress of dam increases with the increase of the overlay soil layer thickness, the vertical stress is bigger than horizontal or diagonal stress, the measured value and the change process are in line with general law. At present, Changma dam is safe and stable operation.
Test for Crack Opening Displacement of Steel Fiber Reinforced Concrete under Three-Point Bending
Authors: Zhang Tin Gyi , Leng Yuan Bao , Gao Dan Ying
Published: October 2010

Based on the principle of electrical measurement method, the clip gauge was made to measure the crack opening displacement (COD).Through the three-point bending test on the specimens of steel fiber reinforced high strength concrete (SFHSC), the effect of the fiber volume fraction (ρf) upon the critical crack opening displacement (the critical crack tip opening displacement and the critical crack mouth opening displacement) was studied. The result shows that the effect of ρf on mouth-tip ratio (the ratio of critical crack mouth opening displacement to critical crack tip opening displacement) can reflect its effect upon the critical crack opening displacement. According to the geometrical relationship between the initial crack length and the critical crack opening displacement，calculation method for the initial crack length was proposed. Based on the test result, the formula was established for calculating the critical crack tip opening displacement.