bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of Spurs Detection System Based on OpenCV
Authors: He Peng , Wang Lian Peng , Wang Na , Xu Gang
Published: September 2011

In order to better solve the problem of detection of small bone spurs with convenient and accurate way, a portable spur detection system is designed. This system, in view of spur reproducibility characteristic, is characterized by the application for a kind of the improved algorithm based on the OpenCV. And it was successfully transplanted into the embedded system. The experimental results indicated that this system might precisely examine the small spur with difficulty discovery by naked eyes used fully by two images of computed tomography which done in different periods. The spur detection system needs to be further improved function to realize more applications. In fact, function expansion based on the system is easy to realize.
The Effect of Overexpression of α (1, 3)- FucosyltransferaseVII on Adhesive Capability of Human Colon Carcinoma HT-29 Cells to HUVECs
Authors: Yue Li Ling , Yu Hai Tao , Zhang Chun Jing , Liu Ji Cheng
Published: September 2011

There are sufficient evidences that Lewis antigens are tumor-associated molecules and correlated to high grade and poor prognosis tumors. In this study, we investigated the effect of (α1,3)-fucosyltransferase VII overexpression on the synthesis of sLex and adhesive capability of human colon carcinoma HT-29 cells to HUVECs.The pIRES2-EGFP-FucT VII eukaryotic expression vector were transiently transfected into HT-29 cells. The changes of FucT VII protein and mRNA expression were determined by flow cytomet- ry and Real-Time PCR; the effect of FucT VII overexpression on synthesis of its downstream product-sLex is detected by Flow cytometry; Rose-Bengal method is used to assay the capability of HT-29 cell adhesion to HUVECs. Results: Eukaryotic expression vector pIRES2-EGFP-FucT VII was successfully transfected into HT-29 cells and made FucT VII overexpressed; compared with that of control group, expression level of the sLeX on the surface of FucT VII transfected HT-29 cells was significantly higher; FucT VII overexpression could enhance the adhesive capability of HT-29 cells to HUVECs. Our data suggest that overexpression of FucT VII could strengthen adhesion of sLeX-mediated HT-29 cells to HUVECs through upregulating sLeX synthesis.
Content Determination of Pb inOcher's Water Decoction and Vinegar Decoction
Authors: Kang Lian Wei , Xiong Nan Yan , Wang Xiao Mei
Published: September 2011

AIM: Establishment Pb the content determines separately method in ocher's Water decoction and the vinegar decoction. Provide the theory basis and the science instruction for the ocher clinical medication. MET Sample decomposition with hydrochloric acid and potassium fluoride. Determined the content of Pb in different characters mineral medicine haematitum by UV-vis spectroscopy, pH9~10, wavelength 520nm；Determined the content of Pb; .RESULTS It is different to the content of Pb in different characters mineral medicine haematitum. CONCLUSION：It should be differences in the clinical application.
Preparation and Microwave Absorption Properties of CNTs/HAp Composites for Use in Tumor Hyperthermia
Authors: Liu Ai Hong
Published: September 2011

CNTs/HAp thermo-seed material were prepared by a simple and effective coprecipitation and hydrothermal treatment method. The phase structure, composition and morphology of CNTs/HAp composites were examined by X-ray diffraction (XRD), transmission electron microscope (TEM). The results showed that When CNTs content was 10wt%, after hydrothermal treatment, a certain high degree of crystallinity, pure component single HAp layer was obtained on the surface of CNTs successfully. The electromagnetic parameters of CNTs/HAp composites were measured in the range from 0 GHz to 5.0 GHz. The results showed that CNTs/HAp composite had better absorbing properties in the 0-5.0 GHz range. With increasing of CNTs content, the microwave absorbing capacity of CNTs/HAp composite had been gradually strengthened, the absorption peak moved towards high frequency, the bandwidth was increased. When CNTs content was 8wt%, a maximum reflection loss value of -26 dB had been obtained at 3.0 GHz. Therefore, CNTs/HAp composite material is expected as thermo-seed material for tumor hyperthermia.
Synthesis and Self-Assembly Behavior of Chiral Amphiphilic Diblock Copolymers Bearing L-Phenylalanine
Authors: Zhou Yong , Liu Bing
Published: September 2011

Novel chiral amphiphilic diblock copolymers bearing L-phenylalanine was synthesized using a “click” reaction of N3-L-phenylalanine and MPEO-b-PGPE. The structure and composition of copolymers were characterized by 1H-NMR and elemental analysis. Additionally, the self-assembly behavior of these chiral copolymers was investigated in sodium dihydrogen phosphate buffer (pH 4.5): the CMC of copolymer MPEO-b-PGTP determined by the measurement of surface tension was 2.1 mg/mL; the size and morphology of the micelles were studied using TEM; the specific optical rotation ([α]25D) of the micellar solutions was also measured; the result indicated that the copolymers can form chiral micelles in sodium dihydrogen phosphate buffer (pH =4.5).In recent years, the synthesis, structure and properties of optically active polymer have been paid attention by scientists owing to its potential applications in chiral separation, asymmetric adsorption, chiral synthesis[1]. The amphiphilic block polymers bearing amino acid possess not only the characteristics of the conventional amphiphilic block copolymer, but also good optically activity and biocompatibility. So it can be employed as nanoreactors for asymmetrical catalysis and materials for drug delivery. But there have been few reports published on the synthesis of chiral amphiphilic copolymers bearing amino acid. Sutthira Sutthasupa reported the synthesis of amino acid-based norbornene block copolymer with ester and carboxyl groups as hydrophobic and hydrophilic units[2]. O’Reilly group synthesized the amino acid-based chiral amphiphilic block copolymers using RAFT technique, and elucidated its self-assembly into spherical micelles with optically active hydrophobic core[3]. In the present work, chiral amphiphilic diblock copolymers bearing L-phenylalanine (L-Phe) pendants poly(ethylene oxide)-b-poly (glycidyl triazolyl-L-phenylalanine) (MPEO-b-PGTP) have been synthesized by the modification of poly(ethylene oxide)-b-poly (propargyl glycidyl ether) (MPEO-b-PGPE) with L-phenylalanine.
A New Method for Solving the Constraint Multibody System Dynamic Equation
Authors: Zhao Ding Xuan , Cui Yu Xin , Ni Tao , Zhao Ying , Wang Chao Fei
Published: September 2011

Aiming at the problem of solving the constraint multibody system dynamic equation, a new method is proposed. This method takes the function of general coordinates to replace the second derivative of the general coordinates in the dynamic equation according to Taylor formula, and considers the converted dynamic equation and system constraint equation as a system of non-linear equations to find the solution by Newton method. Experimental results show that the proposed method is efficient and accurate for solving the constraint multibody system dynamic equation.
Double-Conjugated Ru(bpy)32+ Complexes for Enhanced Electrochemiluminescence Immunoanalysis
Authors: Hou Jian Guo , Hu Fu Tao , Cao Yu Ting , Jin Hai Juan , Li Tian Hua , Gan Ning
Published: September 2011

A new method was established to construct a ultrasensitive electrochemiluminescence (ECL) immunosensor by using Ru@SiO2 (Ru(bpy)3 2+ doped silica) - doped Au (Ru@SiO2-Au) composite nanoparticles to label Ru-Ab2 (monoclonal α-fetoprotein (AFP) antibody labeled with Ru(bpy)32+). The primary antibody, anti-AFP was first immobilized on the multi-walled carbon nanotubes (MCNTs) modified with gold nanoparticles (MCNTs-Au) modified glassy carbon electrode due to the covalent conjugation, then the antigen and the Ru@SiO2-Au composite nanoparticles labeled Ru-Ab2 (Ru@SiO2-Au~Ru-Ab2)was conjugated successively to form a double-conjugated Ru(bpy)32+ sandwich-type immunocomplex through the specific interaction. Accordingly, through the ECL response of Ru@SiO2-Au~Ru-Ab2 and tripropylamine (TPA), a strong ECL signal was obtained and an amplification analysis of protein interaction was achieved. The present immunosensor performed high sensitivity and wide liner for detection α-fetoprotein (AFP) in the range of 0.05-80 ng mL−1 and the limit detection was 0.025 ng mL−1(defined as S/N=3). The morphologies of MCNTs, MCNTs-Au, Ru@SiO2 and Ru@SiO2-Au nanoparticles were characterized by using transmission electronic microscopy (TEM). The developed label and method is versatile, offers enhanced performances, and can be easily extended to other protein detection.
Effects of Buthus martensii Karsch Venom on Cell Proliferation and Cytotoxicity in Hela Cells
Authors: Wang Zhi , Fu Wen Hui , Lu Xiang Yang , Cai Guang Xian
Published: September 2011

This paper focuses on the effect of the venom of the scorpion Buthus martensii on the proliferation of human cervical carcinoma Hela cell line and the related molecular mechanism. MTT test showed that the scorpion venom inhibited proliferation of Hela cells in time-dependent and concentration-dependent manner with 50% inhibitory concentration (IC50) of 34.5 μg/mL(48 h). By using flow cytometry, it was found that the scorpion venom could induce apoptosis and necrosis in Hela cells. RT-PCR and Western blot indicated there were obviously up-regulated in the expressions of p21 protein but the expression of p21 mRNA showed no significant difference in the Hela cell by the scorpion venom. These results suggest that the possible mechanism of the scorpion venom is to activate the expressions of p21 protein and to cause Hela cell apoptosis.
Preparation and Characterization of Coenzyme Q10 Powder Micronized by a Rapid Expansion of Supercritical Solution (RESS) Process
Authors: Meng Xiang Dong , Zu Yuan Gang , Li Qing Yong , Zhao Xiu Hua , Jiang Shou Gang , Sang Mei
Published: September 2011

Micronized Coenzyme Q10 (CoQ10) is prepared with a rapid expansion of supercritical solution (RESS) process, which does not employ toxic organic solvent. Four factors, namely extraction pressure, extraction temperature, nozzle diameter and precipitation temperature are optimized by a four-level orthogonal array design. The optimum micronization conditions are determined as follows: extraction pressure 25 Mpa, extraction temperature 40°C, nozzle diameter 200 μm, and precipitation temperature 25°C. Under the optimum conditions, micronized CoQ10 with a MPS of 147.9±27.3 nm is obtained. The micronized CoQ10 obtained was characterized by High performance liquid chromatography-mass spectrometry (LC–MS) and High performance liquid chromatography (HPLC) analyses. The results showed that RESS micronization process does not induce degradation of CoQ10 and the obtained CoQ10 particles have higher dissolution rate and solubility compared with unprocessed CoQ10 powder.
Visible-Light Illumination Assisted Ethanol Electrooxidation on AuNi/TNAs Electrocatalyst
Authors: Yan Zhao Xiong , Xu Zhi Hua , Yang Shui Bin
Published: September 2011

Gold deposits on Ni/TNAs and Ni/Ti were successfully prepared by displacement- reaction method. The result shows that the activity of all the catalysts for ethanol electrooxidation is improved by visible-light illumination and AuNi-40 min/TNAs exhibits the best long-time catalytic ability. The enhanced activity of the anodes catalyzing ethanol electrooxidation under illumination can be attributed to the plasmonic photocatalytic mechanism based on the excitation of Au, the assistant catalytic effects of TiO2and/or Ni and the improving conductivity of the substrate.
Design and Research of Solar Photovoltaic Power Generation Controller Based on 89C51 Microcontroller
Authors: Zhu Wei Guo , Ruan Hai Lin
Published: September 2011

Portable solar charger car is a new and convenient solar charging equipment attendant to complete on-board battery charging, the continuing drive to improve capacity of electric bicycles. In order to improve the performance of PV controller, solar photovoltaic controller of 89C51 is used. The solar controller has fundamental functions, dependable performance, good real-time data,simple low-power circuit,which can greatly increase the charging efficiency, and achieve very good battery management, also a progress toward real smart charge and discharge.
Graphene-NiO Composite Electrode for Supercapacitors
Authors: Zhou Wei , Tan Man Lin , Zhou Xiao Song
Published: September 2011

In this paper, a facilesolution method was employed to synthesize the graphene-NiO composite. SEM and XRD results indicated the graphene sheets were covered by the NiO nanoplates. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to measure the electrochemical properties of the composite. The specific capacitance reached 1292F/g at a scan rate of 5mV/s. The results show that this composite is a promising material for supercapacitor electrode.
Investigation of Process Parameters Based on Kriging in Sheet Metal Forming
Authors: Xie Yan Min , Xu Xiao Mei
Published: September 2011

Design and analysis of computer experiments have been widely investigated. This study presents numerical procedure to optimize the sheet metal forming process. Metamodels based on responses from numerical experiments may form efficient approximations to functions in engineering analysis. They can improve the efficiency of engineering optimization substantially by uncoupling computationally expensive analysis models and (iterative) optimization procedures. This paper investigated the kriging metamodel approach. At the same time, the practical nonlinear engineering problems such as square drawing are also optimized successfully by proposed method. The results prove Kriging model is an effective method for nonlinear engineering problem in practice.
Effect of Rare Earth Ce Addition on Microstructure and Properties of WCu Contact Materials
Authors: Wang Xian Hui , Zou Jun Tao , Wang Bo , Liang Shu Hua
Published: September 2011

In order to clarify the effect of rare earth Ce on the microstructure and properties of WCu contact materials, different contents of Ce were introduced into W skeleton, and the relative density and compression stress of the pre-sintered W skeletons were tested. Subsequently, WCu contact materials with different contents of Ce were prepared by infiltration method. The hardness, electrical conductivity and the compression stress of WCu contact materials were tested, and the microstructure and composition were characterized by a scanning electron microscope equipped with an energy dispersive spectrometer. The results show that rare earth Ce can purify W/W interface and promote the densification of W skeleton, enhance the bonding of Cu/W, and improve the integral properties of WCu contact materials. In the range of experiments, WCu contact materials with 0.30wt%Ce addition has the maximum hardness of 215HB and the maximum compression stress of 900N/mm2, which are respectively increased by 23.60% and 57.20% in comparison with that without Ce addition.
Variable-Grain Optimization Design of High-Speed Transmission Helical Gear
Authors: Zhao Fu Qiang , Wang Tie , Zhang Rui Liang , Li Yu Juan , Shen Jun
Published: September 2011

A variable-grain strategy is proposed to solve the complicated problem of optimization design on high-speed transmission helical gears with multiple objectives and restrictions. Based on the theory of gear meshing noise and the superiority criteria, a multi-objective evaluation index system is brought forward which gives consideration to the increase of the contact ratio and the decrease of the noise generated by the slide ratio of the tooth flank meshing and the mutation of friction torque, and then the variable-grain multi-objective optimization models of high-speed helical gears are established. The coarse-grained model is utilized in the early design to efficiently determine the direction to the optimal solution. Then the grain is refined and the fine-grained model can be utilized to acquire the optimal result.
A Data Driven Modeling and Simulation Methodology for Automotive Assembly Plant
Authors: Wang Nan , Li Shi Qi , Wang Jun Feng
Published: September 2011

Simulation offers a quick, controllable and tunable approach for prototyping complex assembly processes in manufacturing environments. In order to improve the responsiveness of production system, this paper proposes a new approach based on data driven modeling and simulation methodology, it can automatically generate the simulation model of production system and realize rapid modification. The generated model also has high efficiency, readability and reusability. The approach is developed for an automotive assembly line. Through the modeling approach of IDEF1X, a data structure of simulation model was constructed, a model simulator was implemented in Arena by VBA program, and then a simulation model for target production system was built automatically through the attribute values in the data structure. The management and control process of assembly line is divided into different levels by hierarchical modeling approach, modeling element and control logic of simulation are separated. The case study of the automotive assembly line demonstrates the validity of data driven modeling and simulation methodology.
Modal Analysis of High Power Variable Speed Hydrodynamic Coupling Impellers
Authors: Zhang Rui , Ma Wen Xing , Lu Xiu Quan
Published: September 2011

In view of the complex vibration characteristics of hydrodynamic coupling, dynamic analysis of hydrodynamic coupling is carried out by finite element method (FEM), and modal characteristics of pump and turbine which are the most important parts of it are calculated. Modal vibration analysis data of pump and turbine could be obtained by ANSYS software and the natural frequencies of it within different rotational speed is calculated. The result shows that the natural frequencies of pump and turbine are increasing along with enhance of the rotating speed, and it illustrates that rotating centrifugal force could be reinforced natural frequencies of the structure. According to the relationship between exciting force and rotating speed，the critical speeds of pump and turbine are calculated. And the stability operating condition of hydrodynamic coupling must be avoided in each order critical speed of pump and turbine. The research work provides an effective method to analyze the vibration of hydrodynamic coupling. It is suitable for further dynamic analysis and structure optimum design to reduce the vibration of Hydrodynamic coupling.
A Novel 2 DOF Haptic Device for Gunnery Training
Authors: Zhou Mo Yuan , Liu Guan Yang , Lu Ke Ke
Published: September 2011

Graphic interface and auditory interface has been introduced in Tank training system applied in the army before. A novel 2 Degree of freedom haptic device was designed to improve the gunnery training effect. This paper presents the design of a spherical 2 DOF device that can be used as gunnery station. The design procedure includes the requirement analysis, the selection of the actuator, sensor and transmission, and structure design.
Study of the Problems Related to Dynamic Measurement of Axial Force of Water Pump
Authors: Che Xin Sheng , Gao Yi Fei , Xu Hui , Che Feng Yu
Published: September 2011

The axial force is an important index of rotating machinery, and real axial force can only be obtained through practical measurement in the operation. Some problems related to axial force measurement of water pump is studied in the paper and a special measurement device is designed. The data of real axial force vs. flow are measured during the pump operation and a measurement curve is sorted out by use of reasonable axial force transfer structure and optimized force measuring element. The relative non-linearity error of the measurement device is less than 0.3FS by calibration. The actual measurement results of axial force are consistent with the theoretical curves.
Dynamic Information Acquisition and Processing Technology of Pump Axial Force
Authors: Che Xin Sheng , Wang Xing Hua , Gao Yi Fei , Xu Hui
Published: September 2011

Dynamic measurement of pump axial force has relationships with many fields such as multi-channel information collection and synthesis, sampling rate settings, filter parameters selecting, resolution and uncertainty of measurements analysis and other technical problems. Based on the range and resolution of axial force measurement required, the word length of digital bits to be collected should be determined. Based on the multi-information provided by the force transducers and the working state of the pump, the frequency of data acquisition, number of measurement channels and filter parameters can be determined. The control of data acquisition module is by use of the virtual instrument technologies and processing and display of real-time data are proceeded. The transmission structure of axial force is illustrated and the method of data processing is described. Data processing results show the effectiveness by the filter in restrain the site interference.
Effect of Polypropylene Fiber on Mechanical Properties of Concrete Containing Fly Ash
Authors: Wang Hong Wei
Published: September 2011

A designed experimental study has been conducted to investigate the effect of the fiber fraction of polypropylene fiber on the mechanical properties of concrete containing fly ash, a large number of experiments have been carried out in this study. The mechanical properties include compressive strength, splitting tensile strength and compressive modulus of elasticity. On the basis of the experimental results of the specimens of six sets of mix proportions, the mechanism of action of polypropylene fiber on these mechanical properties has been analyzed in details. The results indicate that there is a tendency of increase in the compressive strength and splitting tensile strength, and the modulus of elasticity of concrete containing fly ash decrease gradually with the increase of fiber volume fraction with appropriate content.
The Platform Architecture of Digital Design and Manufacture for Printing and Die-Cutting Machinery of Corrugated Board Based on MAS
Authors: Pu Hong Bin , Li Wei Guang , Liu Quan Quan
Published: September 2011

The paper presents a platform architecture of digital design and manufacture for Printing and Die-Cutting Machinery of Corrugated Board (PDMCB) based on Multi-Agent System (MAS) to improve the design and manufacture efficiency of PDMCB. In the first, the framework of digital design and manufacture platform for PDMCB has been developed based on the technology of MAS and Product Lifecycle Management (PLM) after analyzing the characteristic of digital design and manufacture system for PDMCB. Secondly, the agents’ functions of the MAS developed for PDMCB are defined and the communication ways between agents are illustrated by Unified Modeling Language (UML). Finally, the prototype system for PDMCB digital design is developed with JADE. The framework brought out in the paper will provide some references to develop the platform of digital design and manufacture for PDMCB.
Research on Product Design of Solitary Elder
Authors: Wang Yan Qun , Zhang Bing Chen , Guo Wei Min
Published: September 2011

Solitary elders belong to vulnerable groups in society, thus they are in urgent need of the social care. As the old age, lower self-care ability and living alone, they have many difficulties in daily life. The product design of solitary elder mainly includes three aspects, movement function,perceptual function，cognitive function. Pay attention to the particularity of solitary elders, designers would create a quality living environment better for them.
A New Algorithm for Calculating the Degrees of Freedom of Complex Mechanisms
Authors: Jiang Wei , Luo Xin , Jia Wen Chuan , Hu Yuan Tai , Hu Hong Ping
Published: September 2011

A new algorithm is presented to calculate the degrees of freedom (DOFs) of spatial complex mechanisms by using the coefficient matrix of the linear constraint equations. A joint constraint matrix is firstly put forward for each kind of joint to formulate linear constraint equations in terms of spatial fine displacements of joint acting point with respect to joint frame. Two kinds of transformation are then proposed to rewrite all the constraint equations in terms of a set of fine displacements of all bodies and it leads to a set of homogeneous linear equations. The rank of the resulting coefficient matrix stands for the number of effective constraints and therefore the DOFs of the mechanism can be easily figured out. The proposed method can be widely used to solve the problem of DOFs for many spatial complex mechanisms, which may not be correctly solved with traditional approaches. Besides, the proposed method is very easy for implementation.
Kinetic Characteristics Analysis and Simulation Research on Carrier Robot
Authors: Wei Juan , Ma Hong Wei
Published: September 2011

According to the status that mine accidents usually occur in the working face away from the mine entrance, this paper advanced a new mine rescue robots system of two robot level consist of carrier robot and exploration robot. Analysis the mechanism structure of the carrier robot, built the kinematics modeling and the orbit modeling, then analysis the Kinetics characteristics and research the simulation of the carrier robot using computer technology, obtained the robot speed and acceleration and other parameters curve. Analysis of the robot body vibration amplitude in vertical and horizontal direction, come to a conclusion that the robot can smoothly carry on the miners orbits.
Finite Element Analysis and Optimization of Long-Span Gantry NC Machining Center Structure
Authors: Xu Shu Bo , Xi Yang , Jing Cai Nian , Sun Ke Ke
Published: September 2011

The use of finite element theory and modal analysis theory, the structure of the machine static and dynamic performance analysis and prediction using optimal design method for optimization, the new machine to improve job performance, improve processing accuracy, shorten the development cycle and enhance the competitiveness of products is very important. Selected for three-dimensional CAD modeling software-UG NX4.0 and finite element analysis software-ANSYS to set up the structure of the beam finite element model, and then post on the overall structure of the static and dynamic characteristic analysis, on the basis of optimized static and dynamic performance is more superior double wall structure of the beam. And by changing the wall thickness and the thickness of the inner wall, as well as the reinforcement plate thickness overall sensitivity analysis shows that changes in these three parameters on the dynamic characteristics of post impact. Application of topology optimization methods, determine the optimal structure of the beam ultimately.
Coupled Dynamic Analysis of a Spar Type Floating Wind Turbine
Authors: Zhang Liang , Wu Hai Tao , Ye Xiao Rong , Jing Feng Mei
Published: September 2011

Floating wind turbine is drawn great attention for deepwater wind energy, and some concepts have been proposed. Dynamic response is of great importance for design and analysis. In this paper, the validated fully coupled analysis code HARP is employed to analyze a spar type concept. The wind turbine is modeled as a wind block with certain thrust coefficient, and the hydrodynamic parameters are calculated using WAMIT. The mooring system is modeled using FEM method and analyzed based on elastic rod theory. The performance of this system is calculated in time domain including the coupled aero-hydrodynamic effect. The simulation is taken under certain design load cases, and primary characteristics are given both in time history and statistics. The results indicate that the concept has excellent performance and HARP could be an effective tool for floating wind turbine design and analysis.
Rigid-Flexible Coupling Model and Dynamic Analysis of Rocket Sled
Authors: Zhang Jian Hua , Jiang Shou Shan
Published: September 2011

The Dynamics Analysis & Simulation of the Rocket Sled were done based on Multibody System Dynamics and Finite Element Analysis Theory. The most difficult work in the analysis was establishing the boundary conditions of the rocket sled. The paper made this kind of attempt. Then the relevant post processing figures and data were obtained, thereby providing the designer and manufacturer with detailed and reliable data. The conclusion is the simulation method is more effective than those before and the boundary conditions is correct and acceptable.
Numerical Simulation on Aerodynamic Characteristics of Heavy-Duty Commercial Vehicle
Authors: Zhang Zhe , Zhang Ying Chao , Li Jie , Wang Jia
Published: September 2011

With the development of automotive technology and high-speed highway construction, the speed of the vehicles increase which cause the significant increase in the aerodynamic drag when road vehicles are moving. Thereby the power of the vehicles, fuel economy, operational stability and other properties are affected very seriously. Heavy-duty commercial vehicles as the most efficient way to transport goods on the highway are widely used, and the speed of the vehicles increases faster. Especially the demands for heavy-duty commercial vehicles are increasing in recent years. Reducing the aerodynamic drag by the analysis of external aerodynamic characteristics, improving the fuel economy and reducing energy consumption have become new research topics of heavy-duty commercial vehicles. To make the heavy-duty commercial vehicles meet the national standards of energy saving, a simplified heavy-duty commercial truck model was built in this paper. The numerical simulation of the vehicle was completed based on the theory of the aerodynamics. The aerodynamic characteristics were analyzed, according to the graphs of the pressure distribution, velocity distribution and flow visualization. To improve the aerodynamic characteristics of heavy-duty commercial vehicles, the main drag reduction measures are reducing the vortex of the cab and the container, the end of the container and the bottom of the container.
Load Spectrum Compiling and Practical Application of Output Flange for Wheel Loader Gearbox
Authors: Zhang Ying Shuang , Wang Guo Qiang , Wang Ji Xin
Published: September 2011

To realize the structural light weighting design of the transmission components of engineering vehicles on the basis of life in control, this paper took wheel loader as an example, collected the time-domain load signals of the transmission system in typical working conditions, provided processing steps for load spectrum synthesis by a certain percentage, and generated the program load spectrum which consisted of various amplitudes and means. The load spectrum can be used for fatigue loading at the output flange of gearbox. Then, the finite element model of the flange was established, and the stress analysis was carried out in the stress concentration location such as fillet. The prediction method of fatigue life on the base of program load spectrum was given. After the fatigue life prediction based on the compiled load spectrum and the theory of cumulative fatigue damage, the fatigue life of outside fillet of the flange, where is of maximum stress, is obtained. It was possible to obtain adequately fatigue prediction results in engineering vehicle design, using load spectrum, finite element analysis, and a stress-life approach to fatigue damage calculations.
Experiment and Test Signal Analysis Based on Speed Fluctuation of Torsional Vibration of Large-Scale Rotary Machinery
Authors: Zhao Wu , Huang Dan
Published: September 2011

A new mode of fault monitoring and controling methods on rotating speed fluctuation was proposed in this study. Torsional vibration model and identification equation of speed fluctuation of large-scale rotary machinery was established based on a two-mass motor driving model. Tachogenerator was adopted to measure speed fluctuation in torsional vibration experiment of large-scale rotary machinery. According to the short time fourier transforms method, the non-steady cyclical or quasi-cyclical characteristics signal of rotating speed fluctuation on elastic shafts were transformed into steady signal to study in a fixed time window function. The methods of monitoring rotating speed fluctuation developed nonlinear stable state signal processing into linear short time fourier transforms signal. The real rotating speed fluctuation solution could be obtained after the data of signal acquisition post-processing by the methods of frequency spectrum analysis and modal analysis. Based on data of signal acquisition, using the methods of fourier phase frequency spectrum, logarithm amplitude frequency spectrum, and self-power spectrum, the quantitative expression under the quantitative analysis stable state was obtained. Through the introduction of realtime signal on rotating speed fluctuation to feedback control system, it is easy to program to realize the real-time on-line torsional vibration monitor of the complex mechanism transmission system on the large scale rotating machinery.
A Study of Smoke Extraction Strategies in a Side Platform with Screen Door
Authors: Zhong Wei , Yang Jian Peng , Pei Bao An , Niu Jian Jun
Published: September 2011

A side platform with screen door was studied in this article using the computational fluid dynamics software FDS5.0, a 3D model of the side platform was built with a fire located close to one end wall in the platform. Large Eddy Simulation model (LES) was used to assess the effect of mechanical smoke exhausting under the different ventilation modes. The analysis of temperature field and CO concentration in the platform showed that the exhaust in fire zone mode can improve the ability of single vent, reduce the disturbance to the smoke layer, and the smoke exhaust effect is better than the other modes.
The Life Prediction System Design of He-Ne Gas Laser
Authors: Cao Wen Lun , Chen Bei , He Yu Yao
Published: September 2011

The data acquisition and life prediction system of gas laser is designed in this paper. The ARM STM3210B module is used as the core of hardware platform. The software platform is composed of parameter setting module, measurement modules of threshold current and optimum operating current, life test module, life analysis and prediction module, reanalysis module of report form and historical data. This article expounds emphatically the relationships among different modules. Meanwhile, the design idea of data exchanges among system software, analysis algorithm and hardware drive is realized successfully.
Structural Optimization and Lightweight Design of PET Bottle Based on ABAQUS
Authors: Hu Qing Chun , Sha Wen Jian , Li Yan Hui , Wang Yong Sheng
Published: September 2011

An explicit nonlinear analysis was implemented to calculate buckling load and stress distribution, based on the Abaqus/Explicit computer program. According to the numerically obtained results, we can optimize the structure of the PET bottle in order to increase the buckling load. Moreover, according to the stress contour of PET bottle obtained by Abaqus, plastic distribution of PET bottle was optimized in order to improve the PET material efficiency and reduce the weight of PET bottle, and which provides a new design ideas for lightweight design of the PET bottle.
Thermal Analysis of a Hot Runner System in Injection Mold
Authors: Hu Qing Chun , Wang Li Ming , Tang Ming Zhen , Wang Yong Sheng
Published: September 2011

The influence of the heat loss of hot runner on the stability of mold injecting process was analyzed. Determine the lost power of heating elements by establishing of hot runner system. Using ANSYS codes to calculate the temperature control equations and get the temperature distribution of hot runner plate. Make the structural arrangement of heating pipes and thermocouples better and ensure thermal equilibrium of the hot runner system by analyzing the temperature field.
Preliminary Study of the Unsteady Response Spectrum Based on Time-Varying
Authors: Qiang Pei , Guan Ping , Tian Jing , Chen Er Liang
Published: September 2011

Engineering characteristics of ground motion can be defined by three factors that are respectively amplitude, frequency and duration. Any one of them in isolation are not fully made known for the ground notions affecting on the structure. Response spectrum theory is one of the principal methods in seismic analysis. The maximum response of structure under earthquake input is only varying with period in traditional response spectrum during the whole time duration. The relationship between the maximum response and duration can not be shown in the response spectrum of earthquake. The concept of unsteady response spectrum is based on moveable spectrum in this paper. Based on the conventional response spectrum, the factor of time is taken into account in unsteady response spectrum research. Then the response spectrum can be studied according to time varying. As examples for strong motion records obtained from WenChuan earthquake, two methods are proposed to research the effect of duration on response spectrum. The result of unsteady response spectrum can play an important role in the further study of the structural failure mechanism and cumulative damage under earthquake loadings.
The Transverse Motion Trajectories Acquisition of the Aeolian Saltation Sand near the Flat Bed Surface by High-Speed Digital Photography
Authors: Yang Bin , Wang Yuan , Zhang Yang
Published: September 2011

This paper describes the way to obtained the transverse motion trajectories of aeolian saltation sand by high-speed digital camera. With the assumption that the background images of the static bed surface on two consecutive pictures were uniform, the saltation sand images on each picture were distinguished from the background image of the bed surface by means of a series of image operation processing used on three sequential pictures. Then the transverse motion trajectories of saltation sand were obtained using the superimpose algorithm and the labeling algorithm. The results show that the transverse motion should be taken into consideration when modeling saltation in air.
A New Algorithm for Spectral Drift Calculation in a Gamma-Ray Spectrometer
Authors: Qin Zhang Jian , Ge Liang Quan , Wu Qi Fan , Cheng Jian Ping
Published: September 2011

Spectral drift of any origin consisting of detectors and nuclear electronics affects the long-term stability in a gamma-ray spectrometer, which is essential to maintaining the high quality of gamma energy spectra. The feedback regulation according to the quantity of spectral drift can restore the system’s stability. A new algorithm for spectral drift calculation is given in this paper. A digital logic unit is developed in a FPGA chip based on the algorithm, and a MCU coordinating with it can fast calculate the spectral drift within only less than 110 instruction periods.
A Fusion Navigation of Double Laser Radar for Intelligent Vehicle
Authors: Meng Li Xia , Sun Fu Chun , Liu Hua Ping , Chu Tao
Published: September 2011

A navigation method is presented for intelligent vehicle based on fusion of double laser radar. Given laser radar model and road curb model, road curbs are detected by one laser radar tilt-mounted on the intelligent vehicle, and they restrict the vehicle to travel inside the road surface. First, obstacle information from two laser radar are unified to same reference frame and fused, then they are implemented using angle potential field method, the best navigation angle is computed under the road curb restriction. Experiments show the algorithm works well in spite of road-boundary has regular shape or not, and is free from the impact of height difference of the road curb and road surface.
Synthesis and Characterization of Strong Polar Macroporous Resin Made from Cellulose
Authors: Qi Xin
Published: September 2011

The macroporous adsorption resin synthesized in this experiment uses cullulose as monomer, adipoyl dichlorid as crosslinker, and cyclohexane as porogenic agent, which three corsslink and polymerize each other, forming the porous skeletal structure. The cellulose processing procedure is as follow: prepare alkali cellulose; crosslink the cellulose (etherification); etherify the cellulose; and functionalize the cellulose. By assaying the perssad characterization of the macroporous resin obtained in this experiment with Fourier infrared spectrometer, we observe hydroxyl group and ester group in the spectrogram. Observing the spectrogram, we find hydroxyl group, indicating that the hydroxyl group in the cellulose has not reacted fully, while the ester group in the spectrogram showing that the ester group has reacted fully with the cellulose. After the aperture characterization for the produced resin with scanning electron microscope (SEM), we find there are unevenly distributed apertures on different levels, which means that new macroporous resin has been synthesized. This paper taking rutin as the adsorbate explores the propertis of static adsorption and desorption of the synthetic macroporous resin, and the influence on its adsorption capability under different situations. The adsorption data shows that the adsorption of rutin on the very resin conforms to the Freundlich isothermal adsorption equation.
Dynamic Finite Element Analysis of RCC Gravity Dam
Authors: Zhang Xiao Yan , Li Ze , Wu Liang
Published: September 2011

Dynamic finite element analysis for a RCC gravity dam is implemented by using response spectrum method in this paper. Firstly, three-dimensional finite element model is established, and then the subspace iterative method is used in the modal analysis of the gravity dam. The natural vibration frequencies, the natural vibration period and modes are obtained. The response spectrum method is employed to implement dynamic analysis of the gravity dam. At last, the combinations of both the static and dynamic stress are made with the principle for extreme strength condition, seismic dynamic response of the dam is investigated.
Analysis of Stress Measuring and Testing of Continuous Rigid Frame Bridge
Authors: Yang Ya Xun
Published: September 2011

According to the structure and construction features of prestressed concrete continuous rigid frame bridge, with reference to the principle of vibrational chord strain gauge to concrete, the vibrational chord strain gauges to concrete are used in the construction control of prestressed concrete continuous rigid frame bridge. This paper introduces the measurement techniques and methods for stress and strain of main girder of the bridge, analyses some infection factors of stress measuring and testing, and presents the error analysis methods of stress measuring and testing and calculation methods of true stress of structure. The techniques and analysis methods prove to be quite effective through the applications and provide background data for constructing safely of prestressed concrete continuous rigid frame bridge.
Numerical Study on Performance Parameter of Pulsed Liquid Jet Pump
Authors: Wang Ling Hua , Wu Ying , Ning Pan Hua , Gan Chao
Published: September 2011

The performance parameters of time-average basic performance equation of pulsed liquid jet pump are studied innumerical methods. Optimal working parameters, change law and influence on performance of momentum correction factor, throat tube inlet function are quantitatively analyzed. The conclusion is obtained that pulse jet could mainly make fluid of throat tube outlet more fully mix and optimal working parameters of liquid jet pump better improve. Also, change law of throat tube inlet function shows the reason why pulse liquid jet pump could improve performance, mainly to increase the entrainment rate.
Research on a Co-Vibrating Vector Hydrophone with Central Fixed Structure
Authors: Wang Peng , Du Yi Qun
Published: September 2011

Suspension system of a co-vibrating vector hydrophone need be designed carefully to reach the requirement of underwater acoustic measurement. Condition of vibration sensing of co-vibrating vector hydrophone is researched separately based on acoustic theory and mechanical vibration theory. A co-vibrating vector hydrophone with central fixed structure had been analyzed. The simplified model and equivalent circuit model of the proposed design were built for the analysis. The voltage response of the hydrophone to acoustic particle velocity is derived, and improvement of voltage sensitivity based on cymbal transducer is performed. Simulation result shows the design of vector hydrophone with central fixed structure can satisfied the requirements of acoustic measurement, and cymbal transducer can improve the response voltage sensitivity further.
Testing and Modeling of Vehicular Hydraulic Braking System with Linear Solenoid Valves
Authors: Jing Hou Hua , Liu Zhi Yuan , Chen Hong
Published: September 2011

For vehicular hydraulic braking system using linear solenoid valves, an experiment setup is built for test, and the nonlinear dynamic model is developed using a combination of mechanistic and empirical methods. Unknown parameters are identified using least squares. The model can be used for simulation and pressure estimation effectively. In order to use this model in controller design, a simplification is also performed and a polynomial static model is obtained between the pressure rate and the driving signal. Model validations are performed by comparing the simulated and measured curves.
Mechanical Characterization of Friction Stir Channels under Internal Pressure and In-Plane Bending
Authors: Vidal Catarina , Infante Virgínia , Vilaça Pedro
Published: September 2011

Friction Stir Channelling (FSC) is a simple and innovative technique of manufacturing integral and continuous channels (also referred as conformal channels) in monolithic plates in a single step. This paper is focused on the mechanical behaviour of integral and continuous FS channels produced in a monolithic plate of the aluminium alloy AA7178‑T6 with 13mm of thickness, typically used in structural aircraft applications. Internal pressure tests were conducted on specimens with a longitudinal friction stir channel. In-plane bending tests were carried out in specimens with longitudinal and transversal channels; different conditions were analysed for each FSC parameters set. Results were analysed and compared concerning the FS channels microstructure and base material mechanical properties. Bending tests results show that tool rotation speed has more influence in the FSC specimens bending strength than tool travel speed and internal pressure tests show that increase tool rotation speed increases the minimum pressure that leaking points arise.
Numeric Simulation of Fatigue Crack Growth in a Material Graded Structure
Authors: Schramm Britta , Richard Hans A. , Fulland Markus , Kloster Viktor
Published: September 2011

This article deals with the development of functional graded materials which is pursued by the collaborative research centre Transregio 30. The functional gradation is produced by a thermo-mechanical production process and is characterized by different fracture mechanical specific values. Because cracks are by all means responsible for failure of structural elements crack growth has to be considered during the development of these materials. In this contribution simulations of crack growth which were carried out with the system ADAPCRACK3D are presented to illustrate the influence of a material gradation on crack growth.