bluuebunny/crossref_metadata_2025 huggingface dataset:
Test on Cement Deep Mixing Soil Strength
Authors: Hou Jin Fang , Li Ming Ying
Published: September 2013

Cement deep mixing method is a normal ground treatment method. However, it is less applied on the soft clay ground improvement. The test was carried out to the strength of cement mixing soft clay. The soft clay was mixed with cement to become cement mixing soil. The strength of cement mixing soil was analyzed at different maintenance ages. As the results, the strength was lower than the anticipation value. After mixing additive, the strength of cement mixing soil increased, but it still wasnt reached the design strength demand. So, the cement deep mixing method is careful to be as a ground treatment method for the project with thick soft clay ground and high design strength.
Photoluminescence and Energy Transfer of Ce3+ and Tb3+ Co-Doped Ba5(PO4)3Cl Phosphor for Light-Emitting Diodes
Authors: Sun Jia Yue , Cui Dian Peng , Xue Bing , Sun Guang Chao
Published: September 2013

Single-phase Ba5(PO4)3Cl:Ce3+,Tb3+ (BPCl:Ce3+,Tb3+) samples have been synthesized via solid-state reaction method. The phase structure and luminescence properties are characterized using powder X-ray diffraction (XRD), photoluminescence excitation and emission spectra. Effective energy transfer occurs from Ce3+ to Tb3+ due to the observed spectral overlap between the emission band of Ce3+ and the excitation band of Tb3+. Ce3+/Tb3+-codoped Ba5(PO4)3Cl shows more intense yellowish-green light compared to that of Tb3+-doped sample under UV light excitation.
Research on Multi-Parameters Estimation Models of Cement Concrete Compressive Strength
Authors: Wang Zheng Jun , Liang Jia Bin , Zhong Jing
Published: September 2013

When acoustic wave passes through concrete, it can reflect concrete quality information through velocity of sound, amplitude, and frequency. Because single acoustic parameter is incapable of reflect concrete quality information in full, the paper carry out the research of multi-parameter models of strength estimation of cement concrete. The paper founded multi-parameter mathematic models of strength estimation on based of wave equation with ultrasonic method. These models consist of dual-parameter model I between velocities of sound, attenuation coefficient I and compressive strength , dual-parameter model II between velocities of sound, attenuation coefficient II and compressive strength, and tri-parameter between velocities of sound, attenuation coefficient I, and attenuation coefficient II and compressive strength. Correlation coefficient of strength estimation of dual-parameter and tri-parameter models is higher. When testing distance is equivalent standard test block in detecting structure of cement concrete, these models may be adopted strength estimation of dual-parameter and tri-parameter models apply in Penetrating method of ultrasonic directive wave.
Study of Microstructure and Magnetic Properties on High-Silicon Steel Composite Sheet
Authors: Yang Xing Wen , Liu Jing , Han Jing Tao , Ji Shuai
Published: September 2013

High-silicon composite casting blank with the silicon content of 12wt% in core layer and with the silicon content of 3wt% in coating layer was fabricated by composite casting. The high-silicon steel composite sheet with smooth surface and good shape can be obtained by hot rolling and warm rolling. After high temperature diffusion and pickling process, the composite sheet with thickness of 0.44mm and homogeneous silicon content of 5.8wt.% could be achieved finally. The test results of magnetic properties show that the magnetic induction intensity B50 and iron loss P15/50 are 1.778T and 2.892w/kg respectively. It implies that the high-silicon steel composite sheet with high magnetic induction and low iron loss can be prepared by composite casting and rolling process.
The Flow Stress and Microstructures of Fe-1.6%Si Silicon Steel
Authors: Yu Yong Mei , Du De Sheng , Xu Yun Bo
Published: September 2013

The hot simulation experiments on the Fe-1.6%Si silicon steel were carried out at 900°C and 1200°C, stains of 0.4 and 0.8, and strain rates of 0.5S-1 and 2s-1 respectively. The maximum stress was 90MPa when samples were compressed in the case of 900°C and a strain rate of 2s-1, and which was 30MPa at 900°C and a strain rate of 0.5 s-1. The true stress-strain curve is characterized by dynamic recovery, and a pancaked ferrite microstructure with the average grain size of 378~660μm could be observed at the strain of 0.8 and 0.4 and deformation temperature of 900°C.
Failure Analysis of Q345 Steel Structures on Port Cranes
Authors: Wang Hong Wei , Li Wen Tao , Bai Hong , Xiao Hai Qing , Yu Hong Mei
Published: September 2013

Based on a system of macro & micro fracture appearance observation, energy spectrum analysis and metallurgical structure inspection, the cause of sample crack of Q345 steel were obtained. The results showed that the specimen occurred fatigue crack under alternating load, the crack source was a line source, the middle area of the fracture was the relatively flat topography and relatively narrow fatigue striations, the rear area of the fracture was the relatively uneven topography and relatively large fatigue striations, and a certain yield occurred at the crack tip.
Cooperative Satisfaction of the Research and Development Team - An Empirical Research on the Green Manufacturing
Authors: Shang Ru , Yang Wen Cai , Fu Zai Jun , Tang Xiu Ying
Published: September 2013

This paper first analyzed influencing factors of Cooperative Satisfaction of The Research and Development Team on The Green Manufacturing. Second, 104 valid data was used to determine the final influencing factors by Factor analysis method: Characteristics of the team leaderInternal characteristics and external characteristic. Third, we had completed the empirical research according to influencing factors.finally,Make conclusions depending on the empirical results.
Optimization Analysis of the Injection Molding Process Based on Orthogonal Test Method and Uniform Design
Authors: Cao Wen Hui , Liu Hong Bin , Li Xue Feng
Published: September 2013

A car battery bracket was taken as the research object and the warp deformation of plastic products was as the quality evaluation index, through the range analysis of orthogonal test method, the influence degree of the warp deformation from the melt temperature, mold temperature, injection time, packing pressure and dwell time was determined, the preliminary optimization of process parameters combination was obtained. Further uniform design was applied for local optimization by taking the preliminary optimized parameters as the basis, the optimal process parameters combination was obtained and further verified by simulation.
Research on the Machining Ability for Rough Machining of Large Hydrogenated Cylindrical Shell Forging
Authors: Wu Ming Yang , Sun Shou Hui , Yan Fu Gang , Cheng Yao Nan , Hu Qiang , Liu Li
Published: September 2013

Large hydrogenated forging cylindrical shell material whose composition is 2.25Cr-1Mo-0.25V is the main machining material of large nuclear power and petrochemical industry, and doing research on its machining ability is of great significance. In this article contrast test of machining ability of three materials: 2.25Cr-1Mo-0.25V steel, 45steel and 42CrMo steel was carried out from three aspects: force of cutting, temperature of cutting and breaking of chips. Then machining ability of three materials was contrasted and analyzed through force of cutting data, temperature of cutting data and object of chips which had been got from test. The reason why cylindrical shell material is difficult to machine was analyzed and some associated measures to improve machining ability of cylindrical shell material were put forward.
Study of Wax Deposition Rate in Waxy Crude Oil Pipeline
Authors: Cheng Qing Lin , Wang Xu Xu , Li Xian Li , Sun Wei , Meng Ling De
Published: September 2013

In waxy crude oil transportation process, wax crystals start to precipitate as the oil temperature drops to wax appearance point, and then form a network structure gradually which attaches to the wall. The problem of wax deposition seriously affects the normal operation of pipeline. Based on the wax deposition tendency coefficient method, combined with experimental data, the parameters related to wax deposition tendency coefficient is fitted, and the wax deposition rate equation of crude oil is determined finally. The variation law of wax deposition rate along the pipeline is analyzed, and the influence of different seasons and different throughput the on wax deposition rate is discussed subsequently.
The Forming Reasons of Polymers of EO/EG Plant’s Decarbonation System
Authors: Shi Li Chao , Yang Xin Li , Wang Jia Hua , Liang Liang , Cheng Li Hua
Published: September 2013

This paper introduces the current situation of the ethylene oxide/ethylene glycol plants decarbonization system of Sinopec Maoming company. The solid polymer produced in condensate liquid of reecycle gas is characterized. The formative factors of polymer are analysed.Some referential basises are provided for plants long-periodic safety production.
Study on the Heat-Treatment of Clad Plate for Cutting Tools
Authors: Yuan Lin Lin , Han Jing Tao , Liu Jing
Published: September 2013

High sharpness, abrasion resistance, superior ductility, and processability are required in cutting tool materials application. Used 304(0Cr18Ni9) austenitic stainless steel as cladding and 440(7Cr17) martensitic stainless steel as core layer to produce excellently combined stainless steel plate by hot-rolled bonding in this investigation as well as researched various heat treatment processes. The results indicated that the core layer has high hardness and the cladding layer has tiny and uniform microstructure by the method of heating at 10501070°C for 15 minutes, water-cooling , then tempering at 200°C.
Analysis of Position-Dependent Extraordinary Optical Properties in Near-Zero-Permittivity Range for a One-Dimensional Superconducting Photonic Crystal
Authors: Wu Ji Jiang , Gao Jin Xia
Published: September 2013

The position-dependent extraordinary optical properties in near-zero-permittivity range for a one-dimensional superconducting photonic crystal consisting of alternating superconductor and dielectric layers are theoretically investigated by using the transfer matrix method. Based on the calculated reflectance spectrum, it is shown the extraordinary optical propriety depends on the relative position between the threshold wavelength and the photonic band gap. By suitably choosing the thickness of the superconducting or dielectric layer, one can design a transmission narrowband filter or resonator to satisfy their needs without introducing any physical defect in a superconducting photonic crystal.
Research on Application of SLA Technology in the 3D Printing Technology
Authors: Ma Xue Liang
Published: September 2013

This paper introduces the basic principle of stereolithography technology, characteristics of laser rapid prototyping technology and its application in various fields, the laser rapid prototyping technology has been in the modeling industry, machinery manufacturing, aerospace, military, architecture, film and television, home appliances, light industry, medicine, archaeology, cultural art, sculpture, jewelry and other fields has been widely applied.
A New Similarity Measure between Vague Sets Based on Information Similarity Coefficient and its Application
Authors: Wang Wei , Peng Jin Ye
Published: September 2013

According to the facts that similar measure between vague set is based on the distance measure mostly, A new similarity measure between vague sets based on information similarity coefficient is presented ,which can satisfy the axiom definition of similarity measure between vague sets. Finally ,an application in the field of content-based recommendation system of electric commerce is given .The example shows that the methods is practical and effective and can improve the quality and accuracy of the recommendation．
Application of Infrared Imaging Technology in Fault Diagnosis of Electrical Equipment
Authors: Li Bao Shu , Xu Xue Tao , Cui Ke Bin , Wei Wen Li
Published: September 2013

Most of electrical equipment failure are associated with overheating and have the characteristics of regional in power systems, temperature and grey value has the nonlinear mapping relationship in infrared image. In this paper, in order to extract image edge features, the infrared image would be preprocessed, then we can achieve identification mark of higher image gray value and automatic achieve the positioning of electrical equipments high temperature area by the topology matrix correction, and then using relative temperature difference method to judge electrical equipment failure. Experimental results show that this method can quickly and effectively locating and identify suspected overheat fault of electrical equipment.
Automatic Monitoring Technology for Surface Settlement of Underwater Foundation
Authors: Liu Ai Min , Yu Zhi Fa , Li Jing Shuang
Published: September 2013

With the construction boost of China marine projects, it is necessary to perform underwater foundation monitoring. This paper describes the modification of two types of vibrating wire instruments to achieve the automatic measurement of surface settlement of underwater foundation. Thus surface settlement of underwater foundation can be monitored by automatic data acquisition, storage and transmission with help of current sophisticated automatic data acquisition, automatic storage and battery systems. The automatic monitoring system can provide real-time and reliable monitoring data to guide the marine construction.
Importance of the Meshing Accuracy for Stress Evaluation in All-Ceramic Restored Teeth
Authors: Porojan Sorin , Topală Florin , Porojan Liliana
Published: September 2013

The fracture resistance of all-ceramic restorations is one of the major concerns in clinical applications of these materials. An in vitro study can help to estimate the in vivo behavior of a new dental material and design method. The FEM (finite element method) seems to be a proper tool to study material behavior in relation to their composition, relationship and geometry, by analyzing the distribution of stress. The purpose of this study was to evaluate, by finite element analysis, the importance of meshing accuracy on stresses induced in all-ceramic restored teeth during protrusion loading. For the experimental analysis, a 3D model of a central incisor was achieved: intact teeth, unrestored teeth with chamfer marginal preparation, the same tooth restored with full pressed ceramic crown. Stress analysis was performed on the restored incisor during protrusion. To evaluate the importance of the meshing accuracy for stresses in all-ceramic restored teeth three kinds of meshing options were chosen: coarse, medium and fine. For the analysis choosing of the proper meshing options is essential for accurate results. The medium meshing is enough to obtain favorable results.
Friction Resistance between Valve Made of TiAl Alloy and its Guide Made of Phosphor Bronze
Authors: Rylski Adam , Siczek Krzysztof
Published: September 2013

A lightweight valve is often made of TiAl alloys and its stem can be solid or hollow. Such valves can mate with guides made of cast iron or of phosphor bronze at different conditions in their contact zone valve/quide. The aim of the research was to measure the friction force in the sliding contact between the valve stem made of TiAl alloy and its guide made of phosphor bronze, in the absence of oil. The experiment was conducted at room temperature and in static air under normal pressure. The investigations were conducted with use of the tester, which is presented in this article. The loading of contact zone has varied periodically during series. The displacement and acceleration of valve and the force during its impact into seat insert have been measured during tests. Additionally the sound level has been measured, either. Tests have been provided for different frequency of driving force. Additionally, researches on the tribotester pin-on-disc, presented in the article, have been provided, with the pin made of Ti6Al4V alloy and the disc made of phosphor bronze. The model of research stand has been elaborated for the simulation of dynamics for the material sample rotating plate assembly. The aim of such researches has been to obtain values of coefficient of friction for such tribological pair and to simulate dynamics of the material sample rotating plate assembly, characteristic for used research stand. The obtained courses of coefficient of friction vs. loading, slide velocity, duration of motion of material sample in respect to the rotating plate have been presented in the article. On the base of simulation results the values of damping coefficient have been estimated, which allow to obtain the value for the amplitude of the modeled motion for the material sample in respect to the rotating plate near to the value of the amplitude for the real motion. Such estimation allows forecasting the dynamics of the mentioned assembly for other values of velocity and loading.
The Performance of Steel Beam during the Cooling Phase and the Impact of Fire Parameters
Authors: Yang Xiu Ying
Published: September 2013

In order to study the performance of steel beam in the cooling process, a series of numerical analysis has been carried out in this paper. The solid model of the beam was established firstly using finite element method, the beam was heated and cooled gradually under the certain uniform load, then the internal forces and deformation of the beam were analyzed in the whole fire process. Based on this, the parameters of the highest temperature, heating rate and the cooling rate were changed, and their affect on the beam performance was studied by comparing.
Kinematics Analysis of a 3-RRR Spherical Parallel Mechanism with Coaxial Input Shafts
Authors: Hou Yu Lei , Hu Xin Zhe , Zeng Da Xing
Published: September 2013

As an important mechanism with special and extensive application, the three degrees of freedom spherical parallel mechanism is always a research hot in the mechanical fields. In this paper, the feature of the 3-RRR spherical parallel mechanism with coaxial input shafts is introduced, and its motion feature is analyzed based on the screw theory. The mobility of the spherical parallel mechanism is calculated by using the Modified Kutzbach-Grübler criterion, and the inverse displacement problem of the mechanism is solved. Then the expression of the Jacobian matrix is deduced based on the kinematics equation and its inverse solution. The contents of this paper should be useful for the further application of the spherical parallel mechanism.
Wetting Behavior of Polymer Melts on Bulk Metallic Glasses
Authors: Zhang Xiang , Sun Bing Li , Feng Wei Na , Zhang Qin Xing , Li Qian
Published: September 2013

The wetting behavior of polymer melts such as HDPE, PP, PC, POM and COC on bulk metallic glass material substrates that are used in polymer micro fabrication like micro injection molding was investigated by sessile drop method at a temperature above the corresponding melting temperatures. Contact wetting angles have been determined on three kinds of bulk metallic glasses: Pd40Cu30Ni10P20, Zr64.8Cu15.5Al8.3Ni11.4and La57.5Al17.5Ni12.5Cu12.5. The equilibrium contact angle has the monotone decrease with the increasing temperature for most polymer melts. Two kinds of wetting behaviors are observed, spanning from 126°, over neutral wetting, to 6°, almost complete wetting. Estimations of the contact wetting angles are presented in different polymer melt temperature. Optimization of process parameter can be chosen according to the wetting ability.
Simulation Research on Hydraulic Brake System of Low-Floor Light-Rail Vehicle
Authors: Zhang Xiang Jun , Zhu Wen Qing
Published: September 2013

The paper discussed the working principle of the hydraulic brake system, and built a model in the simulation by using AMESim to analyze performance of this system. The paper also established a test bench of hydraulic brake system, and the test result coincided with the consequence of simulation, thus to prove the simulation model and method reasonable. This simulation can shorten design cycle of hydraulic brake system apparently, and it contributes a good method to assistant brake system design.
Influence of Mooring Chain Steel Strength on Stress Corrosion Cracking
Authors: Cheng Xiao Ying , Chen Hong Yuan , Liu Wen Qing , Zhang Zhi Juan
Published: September 2013

Two strength mooring chain steels were used to investigate the stress corrosion cracking (SCC) in synthetic seawater. The resistance of both strength steels to SCC was similar in neutral synthetic seawater. But the failure mechanism was different. For lower strength steel, it is mainly induced by anodic dissolution, while for higher strength steel, by hydrogen embrittlement. The reason was elucidated from their microstructures and corrosion characteristics.
Design and Realization of Total Performance Simulation Platform for Aircraft Engine Based on Modelica
Authors: Chen Gao Xiang , Fan Jiang
Published: September 2013

The primary characteristics of Modelica language is described, The steady and dynamic mathematic model of aircraft engine are introduced. The methods of the main components in the aircraft engine generic model library developed by Modelica/Dymola software are expounded. The system level model of a two-spool turbofan engine is built and its steady and off design state is simulated. The results accord with the actual situations, so that the library can help in constituting the simulation system of variety engine with great importance and practical value in conceptual and preliminary design.
Finite Element Analysis for Double Anterior Cruciate Ligament Reconstruction Analysis
Authors: Kuo Chen Ming , Tsai Gwo Chung , Yeh Wen Lin
Published: September 2013

This paper will take five male patients who performed a double-bundle anterior cruciate ligament (ACL) reconstruction to do finite element analysis and compare the stress distributions with each other. In order to lead this paper to reality, a model of the original bone tunnel according to CT is created and transformed into a finite-element model based on the reverse engineering method. The double-bundle ACL graft in the bone tunnel simulates the interference screw which screwed the ACL under the limit of friction and fix of contact. The dynamic analysis is performed with the femur flexion-extension axis which is under the limit of a fixed rotation angle (100°) and two degrees of freedom of motion in flexion. In the postprocess, the ACL graft is divided into several parts to get the stress distribution which will be easily to discuss the results.
The result shows that max stress can be found on the top of the ACL or at the start point of the ACL because of the fixed position of the interference screw. The stress in PL bundle is greater than the stress in AM bundle. The angle of flexion will affect the stress and the stress might be higher at a specific angle.
The Research on Coupling of Fluctuating Pressure and Corresponding Noise of Stilling Pool Base Slab
Authors: Hu Zhi Hua , Guo Wei Dong , Cai Xin Qiao
Published: September 2013

Based on hydraulic and acoustic theory, a model test of broad-crested weir was carried out, and the fluctuating pressure and corresponding noise values of stilling pool base slab were measured and recorded with three schemes of different flow rates. The results showed that the fluctuating pressure and noise value of water flow increased with the increasing of flow rate, the fluctuating pressure have certain correlation with the noise value, where the largest fluctuating pressure appeared had the same section with the noise value, yet the fluctuating pressure change trend was not identical to the noise value. The main reasons of producing flow noise were the interaction of flow and solid bottom and the flow turbulence.
Improved Grey Forecasting Model for Taiwans Green Accounting
Authors: Lin Ching I , Lu Shin Li , Tai Shih Hung
Published: September 2013

This paper applies the grey forecasting model to forecast the green accounting of Taiwan from 2002 to 2010. Green accounting is an effective economic indicator of human environmental and natural resources protection. Generally, Green accounting is a type of accounting that attempts to factor environmental costs into the financial results of operations. This paper modifies the original GM(1,1) model to improve prediction accuracy in green accounting and also provide a value reference for government in drafting relevant economic and environmental policies. Empirical study shows that the mean absolute percentage error of RGM(1,1) model is 2.05% lower than GM(1,1) and AGM(1,1), respectively. Results are very encouraging as the RGM(1,1) forecasting model clearly enhances the prediction accuracy.
Computational Simulation of High-Concentration Erbium Media for Lasers Development
Authors: Pereira Junior Nélito Bernardes , Henriques Librantz André Felipe , Luz Alves Wonder Alexandre , Melo Deana Alessandro
Published: September 2013

Different laser designs may require high-concentration erbium lasers. The laser efficiency can be measured by the small signal gain (SSG) of the laser media. In this paper an investigation of the SSG for a Er:YLF with 40 mol % of erbium concentration were carried out by means of computational simulation considering several pumping rates and different pulse duration . Results showed that the maximum SSG values for 40% Er concentration are reached for lower pulse durations and high pumping rates. In addition, results suggest that the performance of such lasers can be significantly enhanced by the adjustment of pulse duration and the interval between two consecutive pulses.
Study on Hidden Information of Microelectronic Packaging Image Series with PCA
Authors: Cao Shao Hong , Han Lei , Li Jun Hui
Published: September 2013

As we have known, temperature changes can distort the outline of the images and even make their details fuzzy when observed in the time domain. But this paper seeks to find out how the temperature changes affect imaging in the space domain. We have to get the main component linking with temperature by studying on a series of images collected during the thermosonic flip chip bonding process with PCA. In the experiment we used five sets of 500 images (collected at 10°C, 60°C, 80°C, 100°C, 120°C.100 images of each temperature.). Then we did PCA experiment with these five sets images on MATLAB, get the first ten PCs of each set, and analyze their changing rules to find out the main component associated with the temperature factor.
An Improve Firefly Algorithm and its Application
Authors: Liu Ping , Li Yue Guang
Published: September 2013

In this paper, according to the characteristics of TSP. A Novel Firefly Algorithm was used to solve the TSP, the algorithm was experimented and the experimental results show that the new algorithm to be successful in locating multiple solutions and better accuracy. The experimental result demonstrates that the Improve firefly algorithm can get better solutions to some Traveling Salesman Problems (TSP) than the solutions given in TSPLIB.
A Novel Bat Algorithm of Solving III-Conditioned Linear Equation Group
Authors: Zhou Rui Hong , Li Yue Guang
Published: September 2013

In this paper, according to the characteristics of ill-conditioned linear equation groups. A novel bat algorithm was used to solve the systems of ill-conditioned linear equation groups, the algorithm was experimented and the experimental results show that the novel algorithm is effective for solving ill-conditioned linear equation groups.
Intrinsic Dimensional Correlation Discretization for Mining Task
Authors: Sang Yu , Song Hong Wen , Zhao Jun
Published: September 2013

Discretization is a necessary pre-processing step of the mining task, and a way of performance improvement for many machine learning algorithms. Existing techniques mainly focus on 1-dimension discretization in lower dimensional data space. In this paper, we present an intrinsic dimensional correlation discretization technique in high-dimensional data space. The approach estimates the intrinsic dimensionality (ID) of the data by using maximum likelihood estimation (MLE). Further, we project data onto eigenspace of the estimated lower ID by using principle component analysis (PCA) that can discover the potential correlation structure in the multivariate data. Thus, all the dimensions of the data can be transformed into new independent eigenspace of the ID, and each dimension can be discretized separately in the eigenspace based on the promising Bayes discretization model by using outstanding MODL discretization method. We design a heuristic framework to find better discretization scheme. Our approach demonstrates that there is a significantly improvement on the mean learning accuracy of the classifiers than traditional discretization methods.
Based on Orthogonal Experiment Method PID Simulation Control of Pumping Unit
Authors: Zhang Zi Kuan , He Lin
Published: September 2013

To study control accuracy of pumping unit system and improve dynamic performance, after ensure every influencing factor, carried out orthogonal test. Permanent magnet synchronous motor of direct torque control was used to model and simulate with experiment parameters based on Matlab/Simulink software, analyzed optimal PID parameter, and can avoid mass and complex test that determine PID parameter combination. The simulation results indicate that it can increase control accuracy clearly and decrease response time, and can reach optimum system performance. Results of simulation analysis have some certain practical value for pumping unit driven by permanent magnet synchronous motor of direct torque control.
Broadband Low-Frequency Vibration Energy Harvester with a Rolling Mass
Authors: He Xue Feng , Zhu You , Cheng Yao Qing , Gao Jun
Published: September 2013

Richness of broadband low-frequency vibration energy in environemnts makes it significant to develop broadband low-frequency vibration energy harvesters. A vibration energy harvester composed of two symmetrical cantilevered piezoelectric bimorphs and a rolling mass in a guiding channel was proposed. A prototype of the vibration energy harvester with a rolling mass was assembled and tested. The base excitation caused the rolling mass to impact with two cantilevered bimorphs repeatedly and the impacts cause the bimorphs to vibrate dramatically. Experimental results show that maximum output power and corresponding excitation frequency increased with the amplitude of base acceleration. For the prototype, the maximum output power of a piezoelectric bimorph on a resistor with the resistance of 100 kΩ was 602 μW under base acceleration with the amplitude of 1.5 g and frequency of 37 Hz, and the half power bandwidth was about 13.5% or 5 Hz.
Robotic Three-Dot Force Feedback to Suppress Surface Contact Slipping in Robot Drilling
Authors: Li C.J. , Qu R.X. , Li S.Q. , Zhu Si Jun , Yao Jun
Published: September 2013

Relative to classic machine tools, industrial robots have a low stiffness. In the use of industrial robots during drilling, it is easy to vibrate. When drill bit contacts with workpiece surface, the vibration will cause the drill bit slipping on the workpiece surface, affecting the quality of the drilled hole, so that hole position accuracy can not meet the requirements, which cause the drilling failure. This paper presents a method based on force feedback to suppress the Surface Contact Slipping (SCS). The method using three-dot force sensors to feedback robots kinematics, keeps the drill vertical with the workpiece surface, to suppress slipping. Simulation analysis shows that the method can effectively improve the quality of the drilled hole, satisfy the drilling requirements.
State Feedback Controller Design for CSTR Based on Kalman Filter
Authors: Wu Hao , Shan Ze Biao , Shi Yao Wu
Published: September 2013

Due to operating conditions and economic factors, it may be either practical or feasible to measuring the chemical species directly in the continuous stirred tank reactor (CSTR) system which is a typical nonlinear, multi-variables, time-varying system. So, a concentration estimate strategy of components based on Kalman filter is proposed, with which the measurement of temperature conversion can be reconstructed. Then the state feedback controller is designed based on the estimated strategy. Simulation results show that the proposed control scheme is efficient and the system contains good dynamic performance.
A Novel and Efficient Method for Digital Printing
Authors: Ji Wen Ge , Wu Hua , Shen Jing , Wang Mei Feng
Published: September 2013

We propose a method for digital printing which is novel and efficient. Digital printing is a technical breakthrough in the field of traditional printing and dyeing industry, which is also an effective solution to solve the three high problem, namely, high energy consumption, high noise, high pollution, in the traditional printing and dyeing industry. However, the widely used methods in printing and dyeing system have some deficiencies, such as the low performance of the PC processor and the limitation of transferring data by parallel interface. The proposed method takes advantage of multi-core processor, DMA and RAID technology. Multi-core processor can speed up the processing of the print command and the print images, while DMA technology can minimize the intervention of the CPU to input/output operations which makes the CPU more effective to process the images. Furthermore, the use of RAID technology can improve the access speed of the hard disk which leading to the efficiency improvement of the entire computer system. As we can see that the combination of those three technologies can greatly improve the efficiency of digital printing machine, thus speeding up the popularity of digital printing.
Safety Analysis for Complex Dynamic Systems
Authors: Strbo Milan , Tanuska Pavol , Smolarik Lukas , Hagara Igor , Gese Augustin
Published: September 2013

The content of this article is the proposal of process of the safety analysis for complex dynamic systems. The safety analysis is carried out in process of the proposal of control system for safety-critical processes. In preliminary hazard analysis is done the identifying all possible risks by PHI method. The PHA method is used to analyze these risks. The method of safety analysis depends on various safety-critical states of system which are system are controlled by models. We propose to use the method SQMD for modeling these states. This method combines qualitative and quantitative methods of modeling states and takes advantage of both methods. The model of the proposal is shown in the diagram. The article includes detailed description of the tasks for each step of analysis.
Review of Sequence Planning of Virtual Assembly
Authors: Xiang Hong Wei , Chen Chang Zheng , Chen Gao Xiang
Published: September 2013

Assembly sequence planning is one of the key technologies for virtual assembly. It mainly consists of three parts, i.e. assembly modeling, planning algorithm and evaluation of sequence planning. This paper presents an overview about the research status quo and methods of the above three parts, analyzes both the advantages and disadvantages of those research methods and their application scope and proposes the trends of their development.
Three-Phase Heuristics Algorithm for Solving JIT Materials Delivery Problem in Discrete Production System
Authors: Jiang Zheng Qiang , Wu Yue
Published: September 2013

To solve the just-in-time materials delivery problem in discrete production system, a three-phase heuristics algorithm is proposed to determine an appropriate materials delivery cycle-time with the constraint of delivery capacity. In which the first phase is to determine the quantity of the materials and the vehicle numbers, the second phase is to solve the travelling time of each vehicle number, and the third phase is to assign each vehicle number to specific vehicles to determine the travelling time of each vehicle. The performance of this three-phase heuristic algorithm is tested and verified by using an example experiment, and the computational results show that the average deviation just increased 0.513% compared with the well-know genetic algorithm and it is much easier to comply. It verifies the effectiveness of this heuristic algorithm in solving the just-in-time materials delivery problem in discrete production system.
Application of Flexible Combine-Clamp in Digital Rapid Production for Aircraft Tube
Authors: Xu Xu Dong , Li Guang Jun , Yuan Sheng
Published: September 2013

Aiming at the existing problem of plane tube welding jig manufacturing, many systems developed such as standard components parameterized modeling system, computer intelligent reasoning system, standard components replacement system, accuracy checking system and standard components management system, and also replace the traditional standard samples by three-dimensional model of tube, then realize the digital rapid design and manufacture of combined welding jig.
Risk Sharing Research Based on Utility Theory in Urban Rail Transit of BT Mode
Authors: Liu Jing Jing
Published: September 2013

BT mode (Build Transfer) is a kind of financing mode, refers to government departments use non-financial fund for basic facilities construction project. In recent years, more and more project in Domestic construction market use BT mode, and BT mode also use in Construction of urban infrastructure projects. So BT mode has a broad application prospect of urban rail transit projects in the future. Based on the analysis of the common operation forms of BT mode, this paper analyzes the common risks in BT mode in operation, and discusses the principle of risk-sharing with utility theory.
Research and Implementation of Auto Parts Proportion Model
Authors: Zhou Kang Qu , Yu Dai Quan , Xiao Yan , Zhang Xiao Li
Published: September 2013

Automobile is a typical multi-stage split charging and assembly manufactured product. It can be divided into engine, body, chassis and electrical four modules functionally. Auto parts proportion is defined as the ratio of purchasing costs of a given part to the total costs. In this paper, an auto parts proportion model is proposed by means of matrix and statistical analysis, a benchmarking proportion calculating model of various vehicle types is presented by means of average and mode comparison. On the basis of these models, target costs of auto-parts, systems and modules can be calculated. These models and methodologies have been used in the processes of new product development costs controlling and developed products costs reduction in a big scale automobile company.
Research of Stochastic Demand Spare Parts Inventory for Equipment Maintenance
Authors: Zhou Kang Qu , Yu Yan Xi , Zhao Hui Zhen , Yu Dai Quan
Published: September 2013

As an important module of enterprise device management, spare parts inventory affects other strategies like equipment maintenance, overhauling, repairing etc. Furthermore, the normal production of enterprises and economic benefits are closely related with it. In this paper, spare parts are classified based equipment maintenance features [. After analyzing the dynamic and uncertain demand context, a probability inventory model which takes equipment downtime loss into account is presented [. A reasonable inventory costs is suggested through a lot of computing. The model and methodology have been demonstrated by a case study.
Analysis on Factors Affecting the Local Stability of Web of Castellated Beams
Authors: Xu Feng , Shao Bo , Yin Wen Qian , Jiang Shao Fei
Published: September 2013

Through the finite element simulation to study the local stability of the circle-castellated beams, reasonable finite element model was established using finite element software and in-depth analysis of the local stability of the circle-castellated beams on the basis of the castellated beams shear performance test. The same span of the circle-castellated beams, deformation stability performance under two point loads simulation, got deformation form of castellated beams under different pitch of holes, opening ratio, stiffener thickness, depth-thickness ratio. The local stability properties of the same span of the circle-castellated beams are directly related to opening ratio and web depth-thickness ratio changes, which has little effect with the change of hole spacing, stiffener thickness. Using the appropriate opening ratio, web depth-thickness ratio plays an important role on improving the local stability of web under the shear force and the bending moment.
Analysis of Oxytropis Tower Structure with Model Method
Authors: Qin Kang , Xu Zhong Gen , Deng Chang Gen
Published: September 2013

Basic principles of the modal analysis are introduced. Model analysis of an oxytropis tower which is in an actual transmission tower system is carried out. Rationality of the modal is checked by results of the vibration periods. Meanwhile, analysis of vibration types of transformation and rotation under seismic action is also carried out, in order to provide reference data for further elastic-plastic analysis.
Testing Research on Application of Rapid-Hardening Sulphoaluminate Concrete in Rapid Repair Engineering for Airport Pavement
Authors: Luo Zhi Gang , Lei Xiao Ping , Zhou Zheng Fei , Liu Yan , Lai Yong
Published: September 2013

Aiming at rapid-repair engineering of airport cement concrete pavement, this paper chooses rapid-hardening sulphoaluminate cement to prepare rapid-hardening sulphoaluminate concrete (RSC) and evaluate its technology performance referring to test methods of Portland cement concrete. The testing results show that RSC possesses excellent workability, good mechanical properties along with abrasion resistance, little shrinkage, and strong bonding with old pavement, which can well meets the requirements of pavement rapid restoration under the condition of not closing airport.
Crack and Condensation Problem Countermeasures of External Thermal Insulation Composite Wall
Authors: Pang Ping
Published: September 2013

Through studying cracks and dewing problems of the energy-saving composite thermal insulation wall, we hope to attract enough attention to the construction technology and quality inspection, strengthen quality management and guarantee the engineering quality. This article has carried on the reason analysis and summarized the project construction commonly used methods from wall stiffness, indoor and outdoor temperature differences, materials and construction technology. The control problems of crack and dewing of energy-saving composite thermal insulation wall has more value in practice.
Feasibility of Substructure Pseudo Dynamic Test on the Tanks in Seismic Research
Authors: Zhou Li Jian , Gao Bin , Fan Yuan Gang , Wang Xiang Ying
Published: September 2013

Modern structures tend to be more and more complicated, setting up the complete calculation model and getting each part of the dynamic response is almost impossible and unnecessary. The substructure analysis technology is effective for the dynamic analysis of large and complex structure. The substructure theory has become increasingly mature and perfect, and has been widely used in structural analysis and calculation. This article simply introduces the principle of substructure pseudo dynamic test, and using the finite element software—ADINA simulates a steel frame.
Finite Element Analysis of Concrete-Filled Double Skin Steel Tubes with Simply Supported under Lateral Impact
Authors: Li Xian Hui , Lei Jian Ping , Wang Rui
Published: September 2013

In this paper, the behavior of concrete-filled double skin steel tubes (CFDST) with simply supported boundary condition was analyzed by Finite Element Analysis method. The Finite Element analysis mode was established and the results have a good consistent with experimental results. The work mechanic and full range analysis of concrete filled double steel tube under lateral impact were analyzed, the results show that the damage of CFDST with simply supported boundary condition under lateral impact is in ductile manner.
Comparison and Study on Seismic Performance of the Special-Shaped Column and Rectangular Column Frame Structure
Authors: Peng Qin , Huang Yi Teng , Luo Yong Kun
Published: September 2013

By introducing the basic concepts and designing principles of special-shaped column structure, this paper attempts to establish three finite element models (the special-shaped column structure, rectangular column structure with the equal area and rectangular column structure with the moment of inertia) by using the SAP2000. And the basic dynamic structure properties of three structures are analyzed. It’s base of the dynamic analysis for the structure. Then, the paper analyzes the elastic seismic performance under the horizontal earthquake action by using the vibration spectrum method and the elastic time-history analysis method. The results show that three models are all in the elastic steps. We compared the anti-seismic property of three models under frequent earthquake.
Dynamic Analysis of Tall Building Structure Based on Ansys
Authors: Zhou Wan Qing , Ouyang Shun Pei
Published: September 2013

This paper uses the finite element analysis software Ansys to model a tall building structure in three-dimensions, then analyze the modal and the response of the structure under wind and earthquake. It provides some references to the dynamic analysis of tall building structure.
A Power Spectral Analysis Method for Wind-Induced Response of Flexible Structures
Authors: Li Jing , Wang Xin
Published: September 2013

A relational expression of wavelet packet coefficients and power spectrum is derived based on the theories of wavelet packet analysis. The new expression is proposed to compute the power spectrum of wind-induced response of structures. Further, the approach is applied to the power spectral analysis of the response signals of a large-span roof structure, and the accuracy of spectral estimation for stochastic signals is verified.
Finite Element Analysis for the Mega Columns for XRL West Kowloon Terminus
Authors: Su Wei , Sun Ying , Huang Shi Qing , Liu Ren Huai
Published: September 2013

Using ANSYS parametric design language, a three-dimensional finite element model is developed to analyze the stress distribution and the strength of the mega columns for XRL West Kowloon Terminus. The detailed von Mises stress distribution in each column, vertical stiffener plates and the diaphragm plates is obtained. From the analysis, the phenomenon of stress concentration is obvious in both upper and lower diaphragm plates. The local value of von Mises stress in them is higher than the yield stress value, which must be avoided by more detailed local structural design.
Economic Effect Research of HRB500 High-Strength Reinforced Bars in the Engineering Application
Authors: Wang Jing , Liu Ping , Feng Jing
Published: September 2013

The four-storey reinforced concrete frame structure was analyzed by PKPM and Glodon software. This paper introduces the applied significance of HRB500 high-strength reinforced bars and the problems existed in the promotion process. It also analyzes the economic benefits of application.
Study on Magnetorheological Fluid Damper
Authors: Wang Xiao Liang , Hao Wan Jun , Li Guang Fan
Published: September 2013

Magnetorheological Fluid Damper has recently received considerable attention. This paper is focused in typical models, the strongpoints and application status of magnetorheological damper. In the meantime, the paper introduce the basic working principle of the smart passive damper using magnetorlogical fluid damper and the Faraday law how to be used in the magnetorlogical fluid damper with the electromagnetic induction part.