bluuebunny/crossref_metadata_2025 huggingface dataset:
The Use of Projective Geometry on the Mechanism System Motion and Stability of the Special Problems in Judgement
Authors: Song Xiao Zhuang , Lu Ming Liang , Qin Tao
Published: February 2012

In a principle of kinematics, when a rigid body is motion in a plane, and the fixed plane only the presence of a speed zero point -- the instantaneous center of velocity. In the mechanism of two rigid bodies be connected by two parallel connection links, why can the continuous relative translation? Where is the instantaneous center of velocity? ... ... The traditional Euclidean geometry theory can’t explain these phenomenon, must use projective geometry theory to solve. The actual motion of the mechanism is disproof in Euclidean geometry principle limitation. This paper introduces the required in projective geometry basic proof of principle, and applied to a specific problem.
Study on Solar Air-Conditioning System of Temperature Difference
Authors: Zhong Cheng Yao
Published: February 2012

In the solar air-conditioning system, it makes chilled water reduced to the lowest temperature in the night of the day without any form of energy consumption, and then makes use of water-cooled chillers of air conditioning to refrigerate further in the valley period of electricity consumptions. By doing this, it can improve the refrigeration coefficient of the air- conditioning system, and save energy and cost of electricity substantially. It will make the cost of solar air- conditioning lower than conventional air conditioning, and furthermore provides a broad way for the popularity of solar energy and solar air conditioning.
A Vector Bond Graph Method of Kineto-Static Analysis for Complex Planar Linkage
Authors: Wang Zhong Shuang , Cao Jian Guo , Chen Ji
Published: February 2012

For the kineto-static analysis of complex planar linkage, the procedure based on vector bond graph is proposed. The constraint force vectors at joints can be considered as unknown effort source vectors and added to the corresponding 0-junctions of the system vector bond graph model, most of the differential causalities in system vector bond graph model can be eliminated . In the case of mixed causality, the unified formulae of driving moment and constraint forces at joints are derived based on vector bond graph, which are easily derived on a computer in a complete form. As a result, the very difficult algebraic problem caused by differential causality and nonlinear junction structure can be overcome, and the automatic kineto-static analysis of complex planar linkage on a computer is realized. By a practical example, the validity of this procedure is illustrated.
The Double-Signals’ Switch of Car Steering and its Management System’s Design
Authors: Zhao Hua
Published: February 2012

The management system of the double switching signals’ design is to achieve the persistent light warning effect by switching to the other main signal automatically when the car’s turning signal is broken. This self-bringing manage system will automatically record the specific location of the broken signal light, and will notice the conservator or the maintenance worker to keep in repair the signal light. Thus, this way can improve managerial effectiveness and shorten examining time. This design adopts single chip or logic control chip to realize automatic switch; and transfers signals between turning signals and main control system according to low voltage power line transmission technology or wireless transmission technology. Based on this, the system will keep working constantly, and facilitate conservators to find stoppages and solve them efficiently.
The Application of the Suction Tube Special for the Piezoelectric Surgery in Impacted Lower Third Molars Removal
Authors: Gao Yong Bo , Lin Dong Xiao , Chen Li Xuan , Sun Hong Chen
Published: February 2012

Objective The present study aimed to introduce the manufracture process of the suction tube special for the Piezoelectric surgery and explore its effect in the surgical extraction of impacted lower third molars. Methods The sample consisted of 114 patients undergoing surgical third molar removal. The special suction tube was periodically used during the whole process of Piezoelectric surgery. Results The suction tube can quickly clear the mouth, essentially vacuuming up the excess liquid, splatter particles and aerosol away from the area of concern, offering a clear surgical field for the dentists. Meanwhile, the tube can be used as a retractor to raise the mucoperiosteum flap, to expose the operation field more clearly. Conclusion The suction tube special for the Piezoelectric surgery can be a simple and practical tool for the Piezoelectric surgery.
Study on Interior Fracture Property of High Strength Steel in Very High Cycle Regime
Authors: Jiang Ren Hao , Li Wei , Shi Yan Ping , He Jiang
Published: February 2012

Based on the fracture mechanics theory and fracture surface topography analysis (FRASTA) method, the interior fracture property of a bearing steel in very high cycle regime was studied by means of rotary bending fatigue test. As a result, this bearing steel represents the duplex S-N curves characteristic, where the interior inclusion-induced fracture is the predominant fracture mode in very high cycle regime. The rough granular bright facet (GBF) area corresponding to smaller inclusion is usually formed in the lifetime larger than 106 cycles, whose formation progress can be interpreted as the slow crack nucleation based on decohesion of spherical carbide from the matrix. The fatigue property in the fish-eye region outside of GBF can be interpreted as the stable crack propagation progress and that outside of fish-eye is instable crack propagation progress. The stress intensity factor ranges of GBF and fish-eye, ΔKGBF and ΔKfish-eye, can be regarded as the threshold values of controlling stable propagation and instable propagation of interior crack, respectively.
Error Model for Grinding of Noncoaxial Aspheric Based on Kinematics for Multi-Body System
Authors: Jiang Chen , Guo De Bao , Li Hao Lin
Published: February 2012

The error compensation is an essential issue for improving the accuracy of the machining process. To solve the error compensation for parallel grinding of the noncoaxial aspheric lens, a kinematics model of six-axis ultra-precision machining system has been developed in the present study. Based on the theory of multi-body system, a kinematics errors analysis is presented. The interpolation errors of the parallel grinding method are discussed according to the kinematics errors analysis. Simulation results show that the rotation errors of the grinding system are crucial factors affecting the accuracy of the machining process.
Modal Analysis of Gear Considering Temperature Based on ANSYS
Authors: Yuan Hui Qun , Ri Chol Nam
Published: February 2012

In this paper, regarding a spur gear as the object, the natural characteristics under thermal effect are calculated by using ANSYS. Firstly, taking the friction heat and convection heat as the thermal loads, the gear is analyzed under a steady state temperature. Secondly, taking the thermal stress into account, the natural frequencies are calculated. Comparing the natural frequencies between change and without change of temperature. The result of this study shows that the thermal stress produced by the variation of temperature is the main reason of natural frequency change.
Design of Self-Adaptive ZVS Protection Circuit for Electronic Ballast
Authors: Li Xian Rui , Liu Qian , Shen Rui
Published: February 2012

The overlap of the voltage and current of power MOSFET will leads large power loss when power MOSFET in a ballast turns on. To solve this problem, a self-adaptive ZVS protection circuit is proposed, which consists of a dead time control circuit and a ZVS control circuit. Compared with traditional circuit with fixed dead time, it can regulate the dead-time automatically to realize ZVS with a negative feedback loop and result reduction advantages come from, such as the induction of power loss and EMI, meanwhile the efficiency is improved. Hspice simulation shows that the ZVS protection circuit in the ballast with an input voltage of 14V and an operation frequency of 50 kHz can realize the self-adaptive dead time.
Finite Element Simulation Analysis for Cutter Head of Slurry Balance TBM
Authors: Liu Peng , Gong Ya Dong , Wang Chao
Published: February 2012

This study present a finite element model of Ф11.18m Slurry Balance TBM. Loads on the cutter head in different geological conditions and different working conditions is discussed and stress distribution of the cutter head in three typical working conditions is obtained. The stress distribution and deformation trend of the cutter head in various working conditions have been shown in this paper. Weak areas of structural strength and stiffness of the cutter head have been obtained and the dangerous condition has been identified through the analysis results. These results provide necessary reference to evaluate performance of the cutter head.
An Improved Method to Calculate the Meshing Stiffness of Helical Gear
Authors: Yang Wei , Huang Yi Lin , Sun Hong
Published: February 2012

The meshing-stiffness of a helical gear pair is one of important parameters to study dynamic characteristics of gear transmission system. However, the equation to solve the meshing stiffness is very complex and difficult to get it. We put up with an improved method to quickly calculate the meshing stiffness through analyzing the meshing process and characteristics of the helical gear pair. The obtained time-variant meshing stiffness curve matches the theoretic stiffness curve very well. The result is shown that the method for calculating contact line based on the helical gear engagement process and characteristics, can be understand intuitively and easily.
Study on Optical Properties of Silicon Oxycarbide Thin Films Prepared by RF Magnetron Sputtering
Authors: Chen Tao , Wang Duo Shu
Published: February 2012

Silicon oxycarbide（SiCO）thin films is a kind of glassy compound materials, which possess many potential excellent properties such as thermal stability, wide energy band, high refractive index and high hardness, and have many potential applications in space. The preparation processes of SiCO thin films by RF magnetron sputtering with different substrate temperature, working pressure and sputtering power were studied. And various surface analysis methods were used to characterize the optical properties of SiCO thin films. The dependence of the properties on the process parameters was also studied. The tested properties of SiCO thin films deposited on K9 glass indicated that lower substrate temperature and sputtering power, higher working pressure could get SiCO thin films with better light penetration and the refractive index of SiCO thin films had a large varying region with the change of the process parameters. With different substrate temperature, working pressure or sputtering power, the maximum refractive index at 633nm（wavelength） are 2.20051, 2.12072 and 1.98959, respectively, and the minimum ones are 1.89426, 1.83176 and 1.8052, respective.
Experimental Study on Anti-Permeability of Cellulose Fiber and Hybrid Fiber Concrete
Authors: Li Yi Jia , Jian Jing
Published: February 2012

The anti-permeability of concrete is one of important indexes of the durability of concrete. The experiment on anti-permeability of cellulose fiber concrete and hybrid fiber concrete were made. And the rule of the anti-permeability of concrete with the different fiber types and mix amount of fiber was researched. The factors of influencing the anti-permeability of concrete were analyzed. The experimental results indicate that the anti-permeability of concrete is improved because of the cellulose fiber, and the permeability coefficient of concrete decrease with the increasing of content of fiber. Even the content of fiber is 0.9kg/m3, the anti-permeability of cellulose fiber concrete is obvious improved, while the steel fiber has less reinforcement effect.
Gender Diversity Research in the Slovak Republic and the Participation of Women in Top Management Positions in Science and Research
Authors: Cagáňová Dagmar , Čambál Milos , Sujanova Jana , Woolliscroft Paul , Holecek Jaroslav
Published: February 2012

The issue of female participation in the field of science and research has been researched and discussed in several studies, most noticeably in ´She figures 2009´. The latest research in Slovakia was conducted by Tatiana Sedová in 2009 and focused upon female students at two faculties within two different universities (Comenius Universtity - The Faculty of Mathematics, Physics and Informatics and the Slovak University of Technology – The Faculty of Electrotechnics and Informatics). The study´s results highlighted the presence of gender role stereotypes, but also a high and long established interest of female students in natural science subjects. Therefore, not only the topic of participation of women in science and research, but also the issue of women in managerial positions is worthy of investigation over an extended period of time. However, the statistics show a relatively low proportion of women in professor position at universities and a low number of women in top positions. The authors of this article will argue that the reasons for this long-time trend are not only based on stereotypes in thinking about gender equality. To be able to identify the next set of factors, it is necessary to carry out research over a long time period that also includes the women’s domestic and working environment. Until now, in Slovakia such a complex study has not been carried out. The article however, contains the starting point facts from the areas of participating women in science and research and in top management positions from the available statistics, relating to researches and area specifications for the future research. Finally, the authors would like to share their experience in this area obtained from UNDP (United Nations Development Programme) and from the active involvement in the Seventh Framework Programme: ”Improving gender diversity management in materials research institutions” with the acronym Diversity, supported by the European Union.
Effect of Heat-Treatment Time on Microstructure and Mechanical Properties of Mg-5Gd-2Y-2Zn-0.5Zr Alloy
Authors: Meng Ling Gang , Fang Can Feng , Peng Peng , Li Nai Pu , Zhu Qiong , Zhang Xing Guo
Published: February 2012

Microstructure evolution of Mg-5Gd-2Y-2Zn-0.5Zr alloy during high temperature heat-treatment at 500°C in the time range 10-70h was investigated. The results show that after adding the element Y, the as-cast Mg-5Gd-2Y-2Zn-0.5Zr alloy forms the Mg12Zn(Y,Gd) phase with 18R-LPSO structure at the grain boundary. During heat-treatment at 500°C, the stability of 18R-LPSO structure is weakened by Gd atoms, parts of LPSO phases dissolve gradually into the matrix with time prolonged and a new type Mg(Y,Gd)Zn phase come into being. LPSO phase in the grain boundary can ensure the ultimate tensile strength and elongation of the alloy, and effect of dissevering on the LPSO phase by Mg(Gd,Y)Zn phase results the decrease of UTS and elongation.
The Influence of Velocity of Moving Load on the Rail Dynamic Response
Authors: Huang Zhi Hui , Chen Qing Guang , Li Yi Gang , Shi Liang Lin
Published: February 2012

In order to study the relation between the velocity of moving load and the rail deformation, a mechanical model about rail elastic support was built for a existing wheel/rail system monitoring equipment's physical model. Combining the boundary conditions and load type, the oscillation equation of rail mechanical model was solved via Vibration superposition method. Analysis the dynamic response of rail under different moving load range from 40km/h to 200km/h by MATLAB.The law of the relation between rail deformation and the velocity of moving load was got. That is the deformation of rail decrease when the velocity of the moving load increase.
Analysis of Seismic Responses During Near-Source Ground Motions
Authors: Hai Su
Published: February 2012

Seismic responses can strongly determine damages of bridge structures, e.g. due to pounding and unseating of girders as observed in many major earthquakes in the past. In the investigations often uniform ground excitation and pounding at only one location are considered. Studies on the influence of non-uniform ground excitation on bridge responses are still very limited, and they are restricted to flat ground-surface condition. Influence of multi-sided pounding is also not much investigated. If the impediment effect of abutments is considered at all. The study reveals that commonly assumed girder stiffness for the end restraint overestimates the actual effective end-restraint stiffness. Non-linear elastomeric bearings can significantly reduce the adjacent girder relative displacements. A consideration of non-uniform excitation is essential for a realistic estimation of bridge response and damage potential.
Research on the Law of AMT Tractor Clutch Engagement at Starting Condition
Authors: Xu Li You , Zhao Yan Ke , Zhou Zhi Li , Xi Zhi Qiang , Xing Ming Xing
Published: February 2012

Based on the analysis of the characteristics of tractor clutch and the engagement process at start-up working condition, the dynamics model of the clutch start-up working condition is established, then clutch engaging control approaches are discussed with emphasis, therefore the clutch engaging control law of “fast-slow-fast” is obtained. According to the clutch control strategy, clutch simulating analysis of an AMT tractor at the starting conditions will be in process by Matlab/Simulink on the basis of well design of fuzzy controller. The analysis result shows that the use of fuzzy control theory could effectively control the engagement process of AMT tractor clutch at start-up working condition.
Effect of Solid Particle on TEHL under Line Contact with Solid-Liquid Lubricant
Authors: Rattapasakorn Sountaree , Mongkolwongrojn Mongkol
Published: February 2012

The two infinitely long surfaces in line contact under thermoelastohydrodynamic lubrication with solid-liquid lubricants were investigated. The time-dependent modified Reynolds equation elasticity equation and the adiabatic energy equation have been formulated and solved numerically with initial conditions using multi-grid multi-level method with full approximation technique. The characteristics of the two surfaces in line contact under thermoelastohydrodynamic lubrication were presented as; film pressure, film temperature and oil film thickness profiles. The results of solid-liquid lubricants with micro-particle and nano-particle under thermal elastohydrohynamic lubrication were compared with the case of pure liquid lubricant.
Based on ABAQUS Roll Bending Forming Simulation Numerical Algorithm
Authors: Tong Rui Hong , Lv Yi
Published: February 2012

This paper first to roll bending forming algorithm is-implicit algorithm and genetic algorithm was carried on the detailed comparison demonstrates to the existing literature experiment for object model, based on the implicit algorithm, established for prediction of the residual stress multi-channel times roll bending forming simulation method, solve the problems of the simulation process convergence, and the influence of the cold bending forming the prediction precision steel simulation parameters were analyzed. Sure the implicit algorithm based on the roll bending forming lane simulation method, and emphasizes to discuss how to solve the resulting convergence problem.
Study on Glass Transition Temperature of Amorphous Polymer Thin Film
Authors: Ren Yi Jin
Published: February 2012

The glass transition temperaure Tg of amorphous polymer thin film was investigated. The opposite experimental results, the increase or decrease in Tg of thin film with decreasing film thickness, were found. It was believed that the free surface near the polymer-air interface has a smaller chain ends density, leading to the decrease in Tg; while the polymer-substrate interface has a larger chain ends density, resulting in the increase in Tg. However, there are a competition between the both, and the interaction of polymer and substrate is a dominant factor to affect Tg of thin film. In addition, the multilayer model of thin film was proposed to explain the effect of the free surface and the interface on the Tg of thin film.
The Transformation Properties of Aroma Components in Banana Drying Process
Authors: Xu Feng Ying , Li Chang You , Chen Zhen , Chen Yong Feng , Deng Sheng Jie
Published: February 2012

To obtain high-quality dried banana, by means of solid-phase micro-extraction, GC-MS, the total ion chromatogram (TIC) changes with time of banana aroma in different drying stages were analyzed. With searching in NISI Willy Database, the aromatic components of above samples were obtained. By classifying the types of the aroma components, the changes of its total number and the classification of substances were compared. A result was drawn that types of total aroma and its main ingredient changed slightly in its normal drying, and substances of esters had high content and the most species. But while drying to the anhydrous state, the main component material isoamyl butyrate transferred to furfural, and Aldehydes, ketones, furans substances increased significantly. These changes were associated with the physical diffusion of material components, biochemical synthesis and chemical decomposition. The results provide a basis for high-quality and high-efficiency banana dryer design.
Wear State Research of Heavy Vehicle Based on Oil Spectrum Analysis
Authors: Liu Xue Gong , Li Zhan Guo , Fan Bin , Yang Yong Qiang
Published: February 2012

In this paper, spectrum analysis is conducted on wear elements in lubricating oil of a heavy vehicle to study the wear conditions. The wear elements in lubrication oil of the heavy vehicle’s transmission system were analyzed, and the evaluation value of wearied vehicle is calculated by processing spectrum data using fuzzy set theory. The two-dimensional concentration gradient model of the vehicle’s wear and tear state is obtained. The method provides the basis for understanding and judging wear action and fault diagnosis of the vehicle intelligently.
Study on Structural Optimization and Wear of Slipper Pair in Axial Piston Hydraulic Motor
Authors: Zhou Zhong Ning , Gu Yong Xia , Ma Li Na
Published: February 2012

The flow field of lubrication film under the bottom of the slipper was analyzed particularly. Taking into account of the rotation and self-rotation of the slipper, got the velocity of lubrication film under the bottom. By machining some regular concaves convergenting along radial in slipper’s bottom face，to enhance lubrication effect ,and improve the wear and tear situation in the outer fringe.
Applied Research of Lock Pin Synchronizer in Tractor Transmission
Authors: Zhou Zhi Li , Liu Yi Tao , Xu Li You , Xi Zhi Qiang , Ding Jin Quan
Published: February 2012

According to the low speed and high torque characteristics of tractor, the paper discussed the application feasibility of the lock pin synchronizer in tractor, and analyzed its running principle and working process. The 3D model of synchronizer is established based on Pro/e software. The dynamic simulation of the synchronizer’s working process is made by the multi-body dynamics analysis software ADAMS. The dynamic simulation curves reflected synchronizer properties such as angular velocity, friction torque and the synchronization time. After being compared with the theoretical calculation value, the results show that there are only some smaller errors exist between theoretical value and simulation value, which verified the accuracy of simulation model.
Numerical Simulation of High Frequency Electromagnetic Field in Soft Contact Continuous Casting Mold
Authors: Tian Peng , Wang Xing Juan , Zhu Li Guang , Xue Yue Kai , Chen Wei , Tian Wei
Published: February 2012

Based on electromagnetic theory, a billet model electromagnetic continuous casting of physical and mathematical were established. The three-dimensional mold for billet electromagnetic field was calculated by finite element method of ANSYS three-dimensional numerical simulation. Then the distribution of the electromagnetic field inside the crystal was gotten. At the same time, the influence of the power frequency and current strength on the intensity and distribution of the magnetic field were simulated. The result shows that the maximum of the electromagnetic flux density lies in the center of induction coil (steel surface in the center of the coil), and the magnetic flux density gradually reduces along the casting direction; the magnetic flux density increases while the power frequency is increasing; the magnetic flux density increases with the increasing of the current intensity.
Analysis of Horizontal Squeeze Casting Process for Pipe Oil Part
Authors: Suranuntchai Surasak , Kittikhewtraweeserd Ekkachai
Published: February 2012

To achieve the laminar flow filling pattern in squeeze casting processes, many literatures [1-4] have reported that ideal velocity of liquid metal passing through the ingate should be between 0.1 – 0.5 m/sec. John Campbell [1] reported that liquid metal front speed velocity should be 0.4 m/sec in order to eliminate the gas porosity inside the casting. However, such slow speed requires the higher temperature of liquid metal and die. This results in not only the longer cycle time but also a coarser microstructure of the casting. In addition, the sample castings used in the literature are simple form castings which do not reflect the real castings used in daily life. In this study, the indirect squeeze casting processes is adopted to cast a motorcycle’s component originally produced by a high pressure die casting process. Based on shape and dimensions of the casting to get the real casting out for the mass production, melt’s speed must be higher than the level reported by the literatures (around 1 m/sec). As a result, a fully laminar flow may not be achievable. This is confirmed by the primary study of the process parameters and tooling design using the casting process simulation. However, by clinging on the two principles of the squeeze casting processes; (1) minimizing the amount of entrapped air by slowly fill the cavity and (2) reducing the amount of solidification shrinkage by pressurized solidification; the casting from two processes will be casted in order to compared the micro-structure and mechanical properties.
Mechanical Properties and Microstructure of Boron Carbide-Cerium Boride Composite
Authors: Peng Ke Wu , Pu Nian Wen , Ma He Li , Chen Ren , Wang Yan
Published: February 2012

The mechanical properties of B4C-CeB6 composite prepared by hot pressed sintering method were tested. The study shows: the hardness of B4C-CeB6 composite increases with the content of cerium boride. When the content of the cerium boride is 4wt%, the hardness reaches its supreme value of 31.98Gpa，its hardness is improved nearly 21.09% compared to monolithic boron carbide. The content of the cerium boride does not affect greatly on flexibility strength. However，it gives much effect on fracture toughness. When the content of the cerium boride is 4wt%, the fracture toughness reaches its supreme value of 5.06MPa.m1/2, which is improved nearly 37.5% compared to monolithic boron carbide materials. The main fracture way of B4C-CeB6 composite is intercrystalline rupture, while the transcrystalline rupture is minor. It appears that this change of fracture mode gives rise to the improvement of the fracture toughness.
Study of Electrodeposition Parameters on Performance of Core of Thin Film Transformer
Authors: Hou Xiao Wei , Liu Shi Bin , Li Ju Ping , Yang Shang Lin
Published: February 2012

The electrodeposition can endow many properties for the devices, which plays an important part in the field of electronic manufacturing. The thin film transformer, fabricated with the usage of electrodeposition, expands the performance of traditional transformer, leading to many new characteristics and functions. The paper chiefly analyses the processing conditions of electrodeposition, including the solution composition, current density, PH value, temperature, stirring, power waveform, heat time, additives, etc. These factors bring significant influences on the behaviors of thin film transformer, for example magnetization, coercivity, compactability, density, ductility, wear resistance, corrosion resistance, porosity, brightness, molecular structure, crystal properties. It also presents some possible reasons about the different performances among the thin films. All these work provides beneficial exploration for the fabrication and optimization on the magnetic core of thin film transformer.
Novel Approach to Fabricate an Amperometric Biosensor by One-Step Electrodeposition Hemoglobin and Au Nanoparticles-Chitosan Nanocomposite Film on Carbon Ionic Liquid Electrode
Authors: Sun Ai Li , Chen Gai Rong , Zhu Qian Hua
Published: February 2012

By one-step co-electrodeposition Hemoglobin (Hb) and Au nanoparticles-chitosan (Au NPS-Chi) nanocomposite film on carbon ionic liquid electrode(CILE), the Hb immobilized with Au NPS-Chi nanocomposite film was stable and retained its functional activity. The results of cyclic voltammetrys showed a pair of well-defined and quasireversible redox peak of Hb with the formal potentials of −0.545V (vs.SCE) in 0.1 mol/L pH 7.0 PBS; a linearity range for determination of H2O2 is from 0.4 to 208.4μmol/L with a detection limit of 0.12 μmol/L (S/N=3). As a results, the one-step co-electrodeposition and the promising feature of nanocomposite could serve as a versatile platform for the fabrication of electrochemical biosensors.
Elimination of Thermal Bridge by Thermal Insulation Composite Material
Authors: Pospíšil Tomáš , Pěnčík Jan , Matějka Libor , Matějka Libor , Kalužová Alena , Dostálová Darina
Published: February 2012

With the sustainable construction the emphasis is placed on energy savings, reducing of consumption of natural resources, extending of the life cycle of recycling, etc. The research has brought about a new material - thermal insulation composite material - which is formed by a combination of recycled polymers and inorganic fillers satisfying the condition of recyclability. Using this material in the solution to eliminate thermal bridge at the wall foot can reduce heat loss of the building.
The Estimation of Micro-Crack Behavior in Polymer Particulate Composite with Soft Interphase
Authors: Majer Zdeněk , Náhlík Luboš , Hutař Pavel
Published: February 2012

The presented paper is focused on the numerical study of fracture behavior of polymer particulate composites. The polymer particulate composite is modeled as a three-phase continuum. Together with particles and matrix is considered an interphase. The interphase is created on particle-matrix interface. Non-linear matrix material properties were experimentally determined and used in calculations. The main aim is to estimate micro-crack propagation direction for the variety of matrix and interphase material properties. The results are obtained using the finite element commercial code ANSYS.
Robust Fault-Tolerant Controller Design for T-S Fuzzy Control Systems
Authors: Yu Yang , Wang Wei
Published: February 2012

The problems of robust fault-tolerant control for T-S fuzzy system with actuator failure are studied. A new sufficient condition for the existence of robust fault-tolerant controller is given. Under the condition, the designed controller can provide the asymptotical stability of the closed-loop system. The non strict LMIs for the system are transformed into strict ones by means of the matrix decomposition. In this way the solutions to the controller can be given via the LMI toolbox. An illustrative example is given to show the feasibility and validity of the proposed approach.
Energy Conservation Strategy and Control Mechanism in Engineering of Water Supply
Authors: Pei Yu Lin , Yang Xiao Yi
Published: February 2012

Water supply system is a complex system. Aimed at the puzzle of being very heavy in energy consumption of system control and being not better in water supply quality resulted from being inappropriate in control strategy, The paper researched on the energy conservation strategy and control mechanism of water supply system. It discussed the cybernetics characteristic of water supply process, proposed the intelligence based fusion control strategy and the energy conservation executing strategy, and analyzed the control model of water supply purifying process and the control algorithm of constant pressure control system. Based on the comparative study of simulation experiment, the display of response curve demonstrated that the intelligence based control strategy would be better than conventional PID control method. The simulation results show that the proposed strategy combined intelligence based fusion control with speed control by frequency variation has better application prospect in water supply system.
Sensor Location Optimization for Distributed Parameter Systems Based on Wavelet Transforms
Authors: Gao Gui Ge , Zeng Xian Wen
Published: February 2012

The sensor location optimization is the special problem of distributed parameter systems(DPS) for parameter identification. It has a great influence on the accuracy of parameter identification and it is important to optimal control of DPS. Therefore, it has a great significance to research the strategy of sensor optimal measurement locations for DPS. In this paper, based on the orthogonal function approximation method, Haar wavelet transforms method is applied to research the problem of sensor measurement locations of DPS. The method based on Fisher information matrix derived from the differential sensitivity equations is proposed to determine the sensor optimal measurement locations. The identification examples prove that the proposed method based on wavelet transforms is feasible and effective to locate the sensor in order to obtain the optimal measurement values. The algorithm makes the calculation simple, easy and accurate.
Research on the Response of Excitation System to the Different Load of Synchronous Generator
Authors: An Qiao Jing , Zhu Chang Qing , Gu Zhi Feng , Wang Chuan Chuan
Published: February 2012

In this paper the process of transient analysis of synchronous generator is analyzed when the load is switched. After the load changed, the excitation response curve of mobile station is obtained via matlab simulation, which provides a theoretical basis for excitation control of the mobile station, then can be helpful for optimizing the motor running and the design of motor protection.
The Usage of Continuous Improvement’s Measure and its Effect on Performance
Authors: Hu Li Run , Yang Yang , Shi Chun Sheng , Tian Ye Zhuang
Published: February 2012

The paper researches the using frequency of Continuous Improvement’s measure and the effect on enterprises, performance. With the continuing changes of the society, the enterprises are facing more and more uncertainty and unpredictability. As a continuously incremental process of enterprise’s level innovation capability, Continuous Improvement has become an important strategy to maintain the manufacturing competitiveness of the enterprises. Choosing the suitable measures is the key of Continuous Improvement. On the basis of international investigation of Continuous Improvement, the paper analyzes the using frequency of Continuous Improvement’s measure and makes a comparison of Chinese, Australian and European enterprises. The results show that foreign enterprises pay more attention to standardized process than Chinese enterprises. Through the analysis of the relationship between Continuous Improvement’s measure and Continuous Improvement’s performance, the results show that standardized process has a big effect on Continuous Improvement’s measure. On the basis of these researches, the paper thinks that Chinese enterprises should increase the understanding and application of standardized process when Chinese enterprises carry out Continuous Improvement.
Variable Structure Control Based Wavelet Transforms for Linear Time-Invariant Distributed Parameter Systems
Authors: Gao Gui Ge , Zeng Xian Wen
Published: February 2012

The distributed parameter systems(DPS) are usually described by the partial differential equations(PDEs). Compared the variable structure control problem of DPS with that of the lumped parameter systems(LPS) , it is more complicated because the problem of variable structure control for DPS is often closely related to the theory of the differential operator or integral operator. Based on Haar wavelets transform, the operational matrixes and their characteristics, this paper attempts to propose a new approach for the variable structure control problem of a class linear time-invariant DPS by converting it into that of lumped parameter systems(LPS) and then makes use of the mature research methods of LPS to design the variable structure control problem so as to solve the variable structure control problem of DPS. The proposed method in this paper has the advantages of the simpler algorithm, less computation and better control effect. The simulation results also prove that it is an efficient algorithm for DPS.
Study on the Method of Error Identification and Compensation for Gear Measuring Center
Authors: Wan Peng , Guo Jun Jie , Li Hai Tao
Published: February 2012

Gear Measuring Center(GMC) is commonly used to test error of the tooth surface of the gear, whose geometric accuracy directly impacts on the accuracy of measurement. How to quickly and accurately detect space geometric error of the measuring machine and compensate becomes the essential means of high-precision measurements. According to the problem above, in the paper, three-beams laser detection technology is proposed. The detection of the geometric errors of the linear axis was achieved. The accurate measurement for the position and attitude of the plane mirror on measurement seat was achieved based on laser telemetry principle. The positioning error, the pitching angle errors, the deflection angle errors and the straightness errors were separated. And then based on multi-body system theory, by using of homogeneous coordinate transformation, the error compensation model of 4-axis measuring machine which includes three shifting pairs and one revolute pair was established, and the algorithm was given in the paper. The theoretical foundation for real-time compensation of 4-axis GMC was established. The geometric errors of GMC can be improved by the method of the error detection and compensation. The method plays a very important role in high-precision measurements.
Integration of OT and IRS to Explore Structure of Statistics Concepts
Authors: Lin Yuan Horng , Yih Jeng Ming , Ko Jui Yu
Published: February 2012

The purpose of this study is to integrate two methodological approaches to explore concept structures. One approach is student-problem chart (S-P chart) and ordering theory (OT) and the other is fuzzy clustering and item relational structure (IRS). S-P chart is adopted to classify all students into proper learning styles. OT is to determine hierarchies of concept structures. Fuzzy clustering is soft computation to cluster features of students and combine IRS so as to determine the precondition and ordering relationship among items. The empirical data is statistics concepts test of university students. The results show that integration of these two approaches is feasible for cognition diagnosis and would be helpful for remedial instruction. Finally, some suggestions and recommendations for future research and educational research are provided.
Microencapsulation of Jasmine Oil in β-Cyclodextrin
Authors: Lian Yuan , Huang Dian Wu
Published: February 2012

Microcapsules of jasmine oil with β-cyclodextrin wall were prepared that can sustain the release of the fragrance.This study examined the morphology, structures and partied size distributions. The thermal properties of the microcapsules were investigated by TGA and the formation was characterized by FTIR. The morphology of microcapsules was examined. The experiments showed that β-cyclodextrin could efficiently improve the thermal stabilities of jasmine oil.
The Influence of Milling Parameters on the Fibrillation of PBO Fiber
Authors: Liu Lin , Li Guang
Published: February 2012

PFI mill was used to prepare PBO fibrils from PBO fiber. With the help of the observation of SEM and the measure of water retention value as well as the analysis of specific surface area, it was found that the milling parameters, including the beating rotation number, beating spacing, beating pressure and beating concentration, influenced the fibrillation of PBO fiber. The processing parameters were studied. The optimal milling conditions were obtained: beating rotation number of 40000-50000r, spacing of 2.4mm, pressure of 4.89N/mm, and concentration of 7.5%. The prepared PBO fibrillar fiber has high specific surface area of 5.001m2/g, while the original PBO fiber has only a specific surface area of 0.476m2/g.
Working Space Analysis of 6-DOF Manipulator Based on MONTE-CARIO Method
Authors: Wang Cai Dong , Wang Hui , Chen Lu Min
Published: February 2012

The working space of manipulator is an important dynamic index. Based on Monte-Carlo method, working space of the 6-DOF (degrees of freedom) underwater manipulator is analyzed in this paper. The virtual prototype of the manipulator is established. Simulation graph is obtained with the aid of arithmetic procedure and computer graphical. Simulation result shows that the manipulator’s working space is bigger and has obtained better effect, which can meet the 6-DOF underwater manipulator operational requirements. The results provide an important reference for the 6-DOF underwater manipulator body design and trajectory planning.
Empirical Likelihood Inference for Linear EV Models with Missing Responses Problem
Authors: Liu Qiang
Published: February 2012

The empirical likelihood inference for linear EV model with missing responses problem is studied. An adjusted empirical likelihood is developed. It can be shown that the adjusted empirical likelihood ratio is asymptotically standard chi-square. Simulation study indicates that the proposed method performs competitively in terms of the average lengths and coverage probabilities of confidence intervals.
The Application of IDEF0 Methods in the Virtual Production Line Design
Authors: Chai Shu Feng , Luo Su Jun , Zhang Xue Ling
Published: February 2012

This paper puts forward a new way of production line design—a virtual production line design flow based on IDEF0 function model. It aims at optimizing the manufacturing of automotive parts to be more scientific and consecutive.
Inverse Identification of Material Parameters of Titanium Alloy TB5 Based on Response Surface Methodology and Quasi-Newton Method
Authors: Sun Yong Na , Wan Min , Wu Xiang Dong
Published: February 2012

The anisotropic behavior of titanium alloy sheet TB5 cannot be accurately obtained by experimental identification of standard sheet uniaxile tensile tests. This paper describes a powerful technique allows for the identification of Hill’48 anisotropic parameters by inverse technique method based on the response surface methodology and quasi-Newton method. The identification approach takes the cylinder drawing as study object, and anisotropic parameters as optimum parameters. And the anisotropic parameters, which gained directly from experimental orthogonal test and uniform design tests, are tuned in the finite element model, that the numerically computed height and thickness of the cup matches the experimentally measured field as closely as possible. The result shows that the anisotropic parameters from the inverse identification can describe the mechanical behavior well.
Pilot Protection Applied in Distribution Network with DG
Authors: Zhou Yu Sheng , Yang Yi , Zheng Pan , Zheng Jian Wu
Published: February 2012

Abstract: Once DG is connected into distribution system, the system will turn from single-source radical network to multi-source network. The power flow will also be changed, which might lead to unreliability of the relay protection. Firstly, the paper analyzes the factors which cause these issues, and then proposes a method to accomplish the procedure of restoration, which is based on pilot protection and over-current protection. The method can solve the problems caused by DG’s connecting into distribution system, and improve the efficiency of DG greatly at the same time. Finally, PSCAD/EMTDC simulation results verify effectiveness and correctness of the proposed method.
The Design of Mechanism for Electric Shuttle Based on MATLAB/ADAMS
Authors: Wang Jian Qiang , Zhu Jiu You , Chen Li Song
Published: February 2012

This paper discusses the principle and practice that the crank-rocker mechanism was utilized as up-down. MATLAB was used for analysis and optimization for the up-down mechanism, in order that the designed path can be realized on the coupler. And then ADAMS was used to create a virtual prototype model for the crank - rocker mechanism，to analyze the kinematic parameters, and to validate the feasibility. The paper tried to setup a universal method for electric shuttles mechanism.
Experimental Study on Application of Cold-Welding Technology in Engine Remanufacturing Field
Authors: Xu Qing Zhong , Li Fang Yi , Ding Tao , Chen Jin Zhi
Published: February 2012

In this study, the surface defects on HT250 material used in diesel engine cylinder were repaired by cold-welding technology, then the microstructure and properties of Ni-base repaired layers were comprehensively analyzed, and the distribution regularity of base surface residual stress was obtained. Analysis results show that internal structure of repaired layer is uniform. The metallurgical combination between repaired layer and base has a good interface with few defects and small Heat Affected Zone (HAZ). The hardness value of repaired layer is lower than that of base. Tensile strength of base is increased after repaired and the distribution range of base surface residual stress is quite small. This research provides a reference to widespread application of cold-welding repair technology in engine remanufacturing field.
Study on Compensation of Guide Track Error in Cylindrical Grinding
Authors: Guo Jian Liang , Zhang Zhe Heng , Chen Lian Qing , Chi Jun , Yang Xun
Published: February 2012

Due to existence of relative motion between the grinding machine body and working table, the manufacturing error of guide track would result in a considerable grinding error inevitably. Thus the guide direction error becomes the most important static error source for longitudinal cylindrical grinding. In this paper, an error compensation system based on industrial computer was developed and used to counteract the guide direction error. In order to verify the performance of the proposed system, several grinding experiments were carried out. The experimental results show that the grinding error due to guide track error reduces by about 33% using the error compensation system.
Main Structure Design on Dual-Purpose Move-Assistant Device of Wheelchair and Crutch on SolidWorks
Authors: Yang Cong Wei , Wu Hai Tao , Liu Hong Bin
Published: February 2012

Established the model of dual-purpose move-assistant device of wheelchair and crutch, using 3D modeling software SolidWorks, finished the 3D model of parts and parts assembly according to the design requirements of dual-purpose move-assistant device of wheelchair and crutch. Verified the accuracy of designing the project. With the software to carry on a 3D model design can save work time and economize the design budget, providing the theoretical feasibility of realizing the dual-purpose move-assistant device of wheelchair and crutch.