bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation Research on the Influence of Tailings Surcharge Load at Open-Pit Mine
Authors: Zhou Chun Mei , Zhang Dian Ji
Published: June 2012

In this paper,international geotechnical engineering analysis software FLAC was used to simulate the influence of tailings surcharge load at open- pit mine to overlying orebody mining at the north of Axi gold deposits in Xinjiang.Engineering geological properties and the process of establishing geological model of open -pit mine in the north of Axi gold deposits in Xinjiang were introduced .It simulated the laws of deformation,stress and plastic zone of the top and base of wall rocks of underground mining in two conditions. The result shows that tailings surcharge load has less influence on orebody mining so that it is a feasible project. But we should strengthen the safety monitoring of rock mass,especially for displacement and stress monitoring of the rock beam.
Features and Applications of Tennis Racket
Authors: Yu Yong , Zhang Hai Long , Jing Shu Peng
Published: June 2012

The study introduced tennis rackets and listed their categories firstly. The purpose was to analyze features of tennis racket. This study showed the influence of vibration mode on response of tennis rackets and Player sensitivity to changes in string tension in a tennis racket. Combining bounce of a tennis ball, made out the applications of tennis racket: a analysis of the ball and racket during first and second tennis serves.
Magnetoresistance of Nanostructured Sr2FeMoO6/CeO2 Composites
Authors: Li Xiang Hu , Li Dan , Xiao Dong Wu
Published: June 2012

(Sr2FeMoO6)1-x/(CeO2)xcomposites with nanosized crystallite were prepared by Sr2FeMoO6obtained from the sol-gel method and nanosized CeO2powders. The magnetoresistance of composites increase with the CeO2increasing. And the MR ratio at 10 K is 1.23%, and 2.48% for the x = 0.05 and 0.2 samples with H = 1 kOe, which are 1.25 times and 2.53 times as large as that for pure Sr2FeMoO6, respectively. The enhanced magnetoresistance was attributed to the spin-dependent tunneling at the interface of grain boundaries.
Synthesis and Characterization of Novel Biological Active Material with Aroyl Urea
Authors: Fan Wang Xi , Li Ze Fang , Zhang Zhou
Published: June 2012

This article used thiosemicarbazide and para-pyridinecarboxylic acid to carry out reaction and synthesized 5-(4-pyridyl)-2-amino-1,3,4-thiadiazole, and then reacted with benzoyl isocyanate to synthesize a new type of urea biological active meterial. The structure of the target compound was confirmed by IR, 1H NMR and elemental analysis. The preliminarily biological activity tests show that the target compound has an activity as plant growth regulator, it’s activity as auxin is 19.3% and it’s activity as cytokinin is 27.4%.
Applied Research on Main Steam Temperature Control Based on Internal Model Control
Authors: Li Jun , Li Wei Wei , Qi Peng , Yu Qing Bin
Published: June 2012

Principles and characteristics of internal model control (IMC) are illustrated. It has a simple and general structure such as that of a PID controller. Applications of IMC based on single loop PID controller tuning in main steam temperature of boiler in power plant were investigated. It can also become easier to achieve in a distributed control system (DCS) via control module configuration. It was applied in boiler of power plant to tune the main steam temperature PID parameters. The application results demonstrate the validity of the proposed method.
Assessing the Explosion Risk of Plants for Dusty, Granular and Combustible Products Example of a Risk Assessment Procedure for a Fluid Bed Spray Granulator
Authors: Radandt Siegfried
Published: June 2012

Risk management is specific to the organization and its external and internal context. In this paper risk management and some concepts focusing specifically on such plants for dusty, granular and combustible products were introduced. Some examples were presented here for practical uses, which can be applied in dusty and complicated surroundings.
Modeling of Magnesium Powders Explosion in a 20L Sphere
Authors: Yuan Chun Miao , Li Chang , Li Gang , Zhang Pei Hong
Published: June 2012

In order to understand the whole process of dust explosions of magnesium powders, a model to describe the evolution of the pressure in the 20L sphere was proposed. This model took into account the nitrification and oxidation of magnesium powder during the explosion. Moreover, the thermal conduction through the wall of the sphere was also taken into account in this model. The model was found to match the experimental data closely.
The Investigation of Arch Model Acting in Mass-Flow Hoppers
Authors: Guo Jie , Roberts Alan W. , Prigge Jan Dirk
Published: June 2012

This paper presents the experimental results of mass-flow hopper arch geometry investigation, which was conducted using a variable geometry plane-flow bin. The cohesive arches formed under different critical outlet openings and hopper half-angles were measured using a 360° two-dimensional laser line scan system. This system was employed to obtain the complete surface profile of each arch across the width of the outlet by moving the rotating laser along the total length of the outlet. The test results were analyzed using Matlab, adopting stationary wavelet transformation de-noising to decrease the signal noise generated during the testing process. The geometric data for each single line scan was smoothed and combined to present a three-dimensional arch surface profile shown to be in good agreement with the observed experimental arch profiles. The angle η at the intersection of the arch with the hopper walls was then calculated by running a Matlab program and a new angle η' is introduced to the arch shape study. The detailed results are discussed in the paper. Arch geometry models, such as the parabolic arc and circular arc arch models developed, respectively, by Walker [ and Enstad [ are reviewed and their relevance is discussed based on the experimental results presented in this paper.
Development of an Embedded High-Temperature Field Measuring Instrument
Authors: Bai Hai Cheng , Meng Hong Ji , Xie Zhi
Published: June 2012

This paper describes the development of an embedded high-temperature measuring instrument, which is composed of lens, photoelectric converter based on area-array CCD, and data acquisition, processing, Ethernet communication module based on DSP. The device is a creation of imaging spectrum, CCD imaging technology, digital image processing method and Ethernet communication together effectively. The advantages of this approach are: First, the networked measuring platform provides the possibility for process parameters optimization. Second, direct digital signal communication improves the anti-interference ability. Third, by employing 4-stage pipeline data processing mechanism greatly improves the real-time requirement. Fourth, through the constitution of application-layer protocol, the reliability of high-speed data transmission via Ethernet is guaranteed. The experiment by blackbody furnace in the laboratory shows that the maximum absolute error is 3.2 ºC, and the maximum relative error is 0.40%.
Deformation Modes for Assemblies of Frictionless Polydisperse Spheres
Authors: Kumar Nishant , Imole Olukayode I. , Magnanimo Vanessa , Luding Stefan
Published: June 2012

The challenge of dealing with cohesive powders during storage, handling and transport are widely known in the process and pharmaceutical industries. Simulations with the discrete element method (DEM) provide further insight into the local microstructure of bulk materials. In this work, the DEM approach is presented to investigate the flow behavior of granular systems subjected to different modes of deformations. When uniaxial compression is applied of frictionless, polydisperse spheres above jamming (transition from fluid-like state to solid-like state), the evolution of coordination number (average number of contacts per particle) and pressure as functions of the volume fraction are, astonishingly, identical to results obtained for purely isotropic compression. Analytical predictions for the evolution of pressure and coordination number under isotropic strain can thus be separated from different deformation modes, as applied in this study. After two different modes of volume-conserving deviatoric shear, the results still compare quite well with results for purely isotropic compression. The difference between the two deviatoric modes and uniaxial deformation is examined with respect to the anisotropic stress response as a function of deviatoric strain.
Population Balance Modelling and Experimental Validation for Synthesis of TiO2 Nanoparticles Using Continuous Hydrothermal Process
Authors: Chen Man , Ma Cai Y. , Mahmud Tariq , Lin Tian , Wang Xue Z.
Published: June 2012

Population balance (PB) modelling is investigated as a tool to study hydrothermal synthesis (CHS) technique for nanomaterial formulation. In particular, the effects of solution concentration and reactor residence time on the particle size distribution were examined. For the purpose of model validation, the simulated results were compared with data obtained from experiments conducted using a continuous stirred tank reactor for production of nanosize TiO2 particles. Product composition was analysed using Fourier transform infrared spectroscopy, and particle size was characterised scanning electron microscopy, zetasizer and image analysis. Good agreement between experimental and simulation results was achieved.
Preparation of Nano-Sized TiO2 Supported on Granular Activated Carbon and the Photocatalytic Degradation of Methylene Blue
Authors: Zhang Peng , Lai Shu Ting , Liu Fang , Yang Zhuo Hong , Zhou Wu Yi
Published: June 2012

nanosized TiO2 were prepared using TiOSO4 as the precursor by hydrolysis-precipitation and hydrothermal method. Through dipping granular activated carbon (GAC) into the TiO2 hydrosols, The nanosized TiO2/GACs composite was obtained. The surface morphology, microstructure and element distribution of the composite were characterized by TEM, SEM, XRD, EDS respectively. The results show that the synthesized nanosized TiO2 is anatase phase with average size of 150-200 nm and can be dispersed uniformly on the surface of GACs. Photocatalytic experimental shows that when the load amount is 1.5%, the nanosized TiO2/GACs composite have the best effect of removal methylene blue,the rate up to 97.0 % in 180 min.
Operation Efficiency Evaluation on Small and Medium-Sized Powder Metallurgy Enterprise Cluster Supply Chain
Authors: Li Guo Fu , Guan Jin
Published: June 2012

Efficiency evaluation indexes and their weights selection method to the small and medium-sized powder metallurgy enterprise cluster supply chain were put forward and a supply chain efficiency evaluation model for it was set up. The efficiency evaluation to the supply chain can contribute to analyzing, discovering and solving the affecting efficiency problems in the operation process, and make the material flow more orderly, balanced and effective, reduce the logistics cost and the manufacturing cost and promote the agility and competitiveness of the cluster.
Controllable Imprinted Polymer Layer Coated Silica-Gel for S-1-(1-Naphthyl) Ethylamine Recognition by ATRP
Authors: Bing Nai Ci , Zhu Xiang Rong , Tian Zhen , Xie Hong Yong , Wang Li Jun
Published: June 2012

Controlled grafting ofS-1-(1-naphthyl) Ethylamine-imprinting polymer layer on the silica-gel was carried out by the surface-initiated atom transfer radical polymerization (ATRP). Polymerization time was used as the independent variable to manipulate the amount of grafted imprinting polymer on the silica-gel. For comparison, molecularly imprinted polymers (MIPs) without silica-gel also prepared at the same condition. SEM, FT-IR and UV spectrum were used to study the structural morphology and selectivity of polymers and probe the incorporation of imprinted polymer layer on the surface of substrates. Results indicate that the integration of ATRP and molecularly imprinted polymerization realize preparation of molecular selective polymers and it is possible to tune selectivity and morphology in rational way by changing polymerization times. Meanwhile, we achieve a reference strategy for the development of molecularly imprinting polymer for drugs and to handle forms in certain applications such as chromatographic stationary phases for chiral separations.
Experimental Study on Flow Field Characteristic of Bag Filter
Authors: Fu Hai Ming , Zhao You Jun
Published: June 2012

In order to select best filtration velocity of bag filters and to improve gas flow distribution, to increase collection efficiency and to reduce operation resistance, gas flow distribution was tested by using hot-wire anemometer, CFD simulation was made and basic accordant result was obtained by comparing simulation result with experimental result. Test results and analysis showed that: Uneven distribution of flow field was caused by jet flow, critical filtration velocity exited in flow field distribution. Improving measure of flow field and optimize method of bag filter structure was putted out.
Velocity Measurement for Flow Particles by Using Spatial Filtering Technique Based on Sensor Array
Authors: Lu Zeng Xi , Yang Gang , Wang Zeng Shuang
Published: June 2012

In comparison with cross correlative method based particle velocity measurement, the spatial filtering method for particle velocity measurement has the advantages of simplicity of the measurement system and convenience of data processing. In the paper a capacitive velocimeter, based on the spatial filtering method, is described. In this approach a capacitance sensor array has been used as a spatial filter for particle velocity measurements. Experiments were performed on a test rig and the experimental results show that the system relative error is within ±4% over a velocity range of 2-5m/s for a moving particle.
Research of Corner Detection Algorithm with Stack Volume Measurement
Authors: Zhang Peng Xin , Yang Wei Min , Chen Chun
Published: June 2012

In this paper, the comparation and analysis of the conner detection algorithm used in the three-dimensional reconstruction were made .Also the improvement and optimization to the parameters of harris algorithm were done. It is concluded that the hariis algorithm improved had a better effect ,simpler operation and better stability in the measurement of material stack volume measurement through the experimental results.
Modified Board System for Ecological Monitoring of Ground-Based Objects State
Authors: Bekirova Lala R.
Published: June 2012

In order to improve characteristics and to increase reliability of board systems used at researches of the ground objects, estimation of natural resources and control of ecological state of environment, determination and estimation of accidents and explosions of industrial fields, etc. the structural and methodological solutions are offered. At that increase of system response speed and reliability of received results are provided.
Application of Grey Correlation Degree in Identification of Two-Phase Flow Patterns
Authors: Wu Xin Jie , Liu Shi , Li Bin , Xu Chao
Published: June 2012

In order to be able to real-time control over the related equipments of pneumatic transportation system and to prevent plugging from happening, here a method that uses an electrical capacitance tomography system and grey correlation analysis to identify two-phase flow patterns is proposed. Firstly, the concrete steps of two-phase flow patterns identification based on this method are expounded in detail. Then the simulation experiment has been finished to prove the validity of this method. The simulation experiment results have shown that this method has higher recognition precision and faster operation speed in the two-phase flow pattern identification. This method also provides an effective means for the two-phase flow pattern on-line identification.
Study on Petrophysical Parameters Testing Technology for Loose Rock
Authors: Qi Jing Shun , Yang Ming Jie , Liu Yu
Published: June 2012

Petrophysical parameters are not only concerned with grain size, but also with the cementation degree. Therefore, it is difficult to determine the petrophysical parameters for the loose core using traditional testing technique. This paper discussed the influence of freeze-sampled loose rock on the test result of rock porosity and permeability. In view of the grains scattering problem in oil-bearing loose rock samples caused by sample deoil, the calibration method for rock permeability and porosity is proposed in this paper through the comparison of testing methods. The test result indicates that the method of measuring the rock permeability of the oil-bearing samples followed by measuring the rock porosity of the deoiled samples is effective. This method can meet the requirements during sample deoiling, drying and petrophysical parameters testing, decrease the influence of freeze-sampling technique on the test of petrophysical parameters, resolve the difficult problem of testing petrophysical parameters using the same sample, and improve the authenticity and reliability of the analyzing result.
A Novel Approach to Multiphase Flow Metering Using PIV and Tracer Dilution
Authors: Uleh Charles Adam , Zhang Jian Yong , Xu Dong Lai , French Ian
Published: June 2012

This paper introduces a prototype multiphase flow metering system, named Uletech, for multiphase flow measurement. The Uletech Multiphase Flow Meter (UMFM) is based on the combination of particle recognition and the use of Laser Imaging Technology in the form of Particle Imaging Velocimetry (PIV). PIV uses tracer particles which follow the gas or liquid phase. The high resolution digital laser cameras identify/recognize all the different sizes of particle (gas, oil and water) in a multiphase flow. The cameras have sufficiently high resolutions (pixel size) to "see" the tracer particles. The prevailing conditions of high pressure and temperature of the flow regimes makes actual measurement a great challenge. The velocity differences between phases (hold up and slip) means unless the velocities of individual phases and concentrations are known, the true flow rate is practically impossible to obtain. The system comprised of two cameras, laser source, optical arrangement, computer data acquisition system, synchronizer and MATLAB based software. An algorithm that correlates the cameras view to the volume within the pipe has been developed through this research. The computer acquires image signals from the upstream and/or downstream cameras, and carries out the calculation of cross correlation between the two image frames so that the velocity of each pixel can be found. A Gas Liquid Chromatograph (GLC) provides the composition (concentration) of the gas and the liquid hydrocarbon (HC). The product of phase velocity and phase concentration provides the flow rate of the individual phase. This work provides theoretical analysis and experimental validations, and discusses the advantages of the system and its further development.
Microstructure of Graphite and Cu-Ti-C Composites Fabricated by Mechanical Alloying and Spark Plasma Sintering
Authors: Zhuang Jian , Yu Shi Chen , Liu Yong Bing , Cao Zhan Yi
Published: June 2012

Cu-based materials reinforced by titanium carbide used in the field of brake or conducting friction were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). X-ray diffraction results indicate that the composites consist of copper matrix, Cu3Ti2, titanium carbide and graphite. Transmission electron microscope (TEM) image shows that a smooth interface exists between the titanium carbide particles and copper matrix. Moreover, the laminate structure of graphite (800°C) transfers to not consistent with the laminate structure at high temperature (1000°C).
Morphology and Composition Controlled Synthesis of BN-Coated Aluminum Borate Nanowhiskers
Authors: Mo Zhao Jun , Lin Jing , Fan Ying , Zhang Xing Hua , Xue Yan Ming , Liang Chun Yong , Wang Hong Shui , Xu Xue Wen , Hu Long , Lu Zhun Ming , Tang Cheng Chun
Published: June 2012

Large quantities of BN-coated aluminum borate (Al18B4O33) nanowhiskers with typical 20 - 50 nm in diameter and 0.5 - 2 m in length have been successfully synthesized by sol-gel and post-thermal-treatment methods. The dependence of morphology and structures on the synthetic process of the coated nanowhiskers has been investigated systematically. Al4B2O9 nanowhiskers were first prepared at a relative low temperature, and then converted into Al18B4O33 nanowhiskers at higher temperatures in the air due to their high-temperature instability. Besides Al18B4O33phase, Al5BO9 and B2O3 could also be generated in the process of transition. However, if a flow of NH3 gas was introduced during the post-thermal-treatment of Al4B2O9 nanowhiskers, the Al5BO9 and B2O3 phases disappeared and BN-coated Al18B4O33 nanowhiskers were finally obtained. Uniform BN layers were coated on the surface of the nanowhiskers by the interfacial reaction between NH3 and B2O3 vapor which was in-situ generated from the nanowhiskers. The NH3-introducing temperature has a significant effect on the morphology and composition of the nanowhiskers. The BN-coated Al18B4O33nanowhiskers are envisaged to become prime candidates as reinforcement in light metal matrix composites.
Preparation of Spray Pyrolyzed Bismuth Oxide and its Application in Inhibition of Ultraviolet from Light-Emitting Diode (LED)
Authors: Chen Chin Yi , Weng Jui Chung , Chen Jing Heng , Ma Shih Hsin , Horng Tzyy Leng , Wu Jerry J. , Tsay Chien Yie
Published: June 2012

In the present study, bismuth oxide (Bi2O3) powders were prepared from bismuth nitrate at various temperatures by spray pyrolysis (SP). The Bi2O3 powder can convert from a monoclinic α phase to a tetragonal β phase at a pyrolysis temperature of > 600° C. The crystallinity of the SP powder increased with the increase of pyrolysis temperature. The resulting SP powders were then mixed with organics and screen-printed onto the surface of LED for the evaluation of ultraviolet (UV) inhibition. The β-type bismuth oxide powder pyrolyzed at 700°C exhibited a fine crystal structure. This caused the efficiency of UV inhibition to be 97.71% when the powder concentration was as low as 9.04 wt%.
Research on Corrosion Behaviors of 13MnNiMoR Steel Weld Joint in EO Reactor Service Environment
Authors: Geng Lu Yang , Gong Jian Ming , Wang Qian , Jiang Yong , Tang Jian Qun
Published: June 2012

In this paper, corrosion behaviors of 13MnNiMoR steel and its weld joint in the EO reactor service environment were studied. Metallographic analysis and electrochemistry corrosion tests in boiler water which are concerned on different zone metal of 13MnNiMoR steel weld joint have been carried out, and the effect of postweld heat treatment and the pH value of the working medium were discussed. The results indicated that the resistance of different zone metal in joint is tightly connected with their microstructure and heat-affected zone always shows the max corrosion current density. The results also showed that heat treatment could significantly improve the anticorrosion properties of 13MnNiMoR steel weld joint.
Study on Microstructure and Dynamic Performance of Novel Isoprene Rubber Synthesized with Homogeneous Rare-Earth Catalyst System
Authors: Liu Nai Qing , Wang Shuo , Yang Jin Sheng , Tian Xiao Jun , Tian Ming
Published: June 2012

The homogeneous rare-earth catalytic system was used to initiate the polymerization of isoprene, and a novel IR was synthesized with high molecular weight and narrow molecular weight distribution. According to the self-developed rare-earth IR properties, a study on IR and IR/NR blend was made. Microstructure and molecular characteristics of JiHua rare-earth IR were identified by IR spectra, 13C NMR and GPC, and the effect of JiHua rare-earth IR on the vulcanization characteristics and dynamic properties in IR/NR blend was investigated and compared with IR (SKI-3) synthesized with titanium catalyst system and rare-earth isoprene rubber (SKI-5) made in Russia. The results showed that JiHua rare-earth IR to be developed independently was a novel synthetic rubber with excellent comprehensive performance, and it can be used independently and partly substitute natural rubber to make tire. In the IR/NR blend, Not only vulcanization characteristics and the safety in operation for NR was greatly improved, But also dynamic properties of vulcanizates such as dynamic cutting resistance, abrasion resistance, wet-skid resistance and aging resistance were improved to different degrees. These properties reach or surpass the level of the foreign similar products like Russia SKI-3 and Russia SKI-5.
Tribological Performance of Ti6Al4V Alloy Treated by Plasma Surface Ni Alloying
Authors: Zhang Feng , Wang Ze Ying , Wang Zhen Xia , He Zhi Yong
Published: June 2012

Plasma surface alloying technology was applied to introduce Ni element into Ti6Al4V to improve its tribological property. The microstructure, composition, phase constituent and hardness of the alloyed layer were examined. Wear mechanisms were discussed on the basis of wear scar observations. The tribological performance of the alloyed layer was investigated by ball-on-disk sliding tests in different environments. The results showed that the Ti-Ni alloyed layer was about 12μm in thickness and the content of Ni element reached to 28% on the surface. The surface hardness of the layer was 677HV, nearly twice as the untreated Ti6Al4V. The wear resistance of the modified Ti6Al4V substrate was improved obviously in different environments.
Cu Precipitation Dynamics in an Fe-1.18%Cu Alloy
Authors: Ren Hui Ping , Wang Hai Yan , Liu Zong Chang
Published: June 2012

The precipitation of copper during aging at 600oC in high-purity Fe-Cu alloy was examined by means of transmission electron microscopy (TEM).Nano-scale copper-rich clusters with a B2-like structure were observed during heat treatment. These micro structural features play an important role in precipitation strengthening. In addition, the precipitation process has been analyzed in terms of the evolution of microstructure by a Monte Carlo method. A description of the coherent precipitation of copper in iron, based on a vacancy diffusion mechanism, thermally activated jump frequencies and cohesive energy is discussed in order to deal with simultaneous precipitation of metastable and stable phases in Cu-containing steel during aging. This analysis gives an estimation of the precipitation dynamics, as well as the evolution of Cu precipitates across a wide range of temperatures.
Effect of Pulse Current on Tensile Deformation Behavior of IN718 Alloy
Authors: Liu Yang , Wang Lei , Feng Fei , Lu Xu Dong , Zhang Bei Jiang
Published: June 2012

The pulse current was performed on the IN718 alloy during tensile test at room temperature and elevated temperature in the present study. The effect of pulse current on the deformation behavior of the alloy and the mechanisms were investigated. The results show that the deformation resistance decreases and the elongation increases significantly of IN718 alloy during tensile test at room temperature and 1073 K with the increase of pulse current. And the effect of pulse current on the strength and plasticity of the alloy increases as pulse current energy increases. The electroplastic effect of pulse current can promote the dislocation motion, and thus decrease the deformation resistance of the alloy during the tensile deformation. The pulse current reduces the starting temperature of recrystallization, promotes the recrystalllization nucleation, and thus makes it possible that the dynamic recrystallization would occur at lower temperature than that in the conventional temperature field. This is the main reason for the decrease of deformation resistance and the increase of plastic deformation ability of IN718 alloy under pulse current.
Effects of Nb and V on the Microstructure and Properties of Rolled Non-Quenched and Tempered Steels
Authors: Ma Ming Tu , Yang Hong Ya , Mei Hua Sheng , Lu Hong Zhou
Published: June 2012

The property and microstructure of rolled non-quenched and tempered steels of Nb-V comprehensive micro alloying have been investigated .The mechanical properties and the load –displacement curves were measured respectively by using electron tension test machine and digital-impact test machine . The microstructure and fracture surface of impact samples were observed with SEM .The results show that micro-alloying Nb and V non-quenched and tempered steel behaves higher tension strength and toughness than that of only V micro-alloying one under the condition of about same plasticity. Improvement of the properties is related with that Nb can effectively make fine pearlite group and inter-lamella spacing at the impact fracture pearlite flakes. Corresponding relationship between various domain of fracture morphology and characteristics points at the curve of digital impact has been discussed.
The Modeling and Simulation of DFIM Based on Auto Disturbance Rejection Controller
Authors: Zhang Zhi Qiang , Zhuang Ya Ping , Yu Lin Gang , Wu Zheng Guo
Published: June 2012

In order to solve the coupling of rotor current of d axis and q axis, a new kind of control scheme for double-fed induction machine (DFIM) speed regulation system is proposed based on the theory of auto disturbance rejection controller (ADRC). The ADRC is composed of three parts: tracking-differentiator (TD), extended state observer (ESO) and nonlinear state feedback controller (NSFC). In the ADRC scheme, the coupling of rotor current is regarded as the inner disturbance of DFIM, inputting this disturbance to the input port of the speed regulation system by the feedforward compensation, the speed regulation system can change to the simple integral series connection system or simple linear system. This controller can realize decoupling of rotor current of d axis and q axis, obtaining a good speed tracking performance with small overshoot and fast setting time. Simulation results indicate the rationality and validity of the ADRC.
Optimized a Certain Type Wheeled Vehicle Dynamic Capability Based on Chassis Dynamometer
Authors: Chao Zhi Qiang , Wan Zhi Gang , Li Hua Ying , Han Shou Song
Published: June 2012

ntroduced the types of chassis dynamometer and accounted for work process of the eddy current dynamometer. We designed the three isometric for low-speed and high-power wheeled vehicles ,which to solve the three-axis dynamometer.Based on the optimized platform ,we established a dynamic model to analyze.In addition.We also optimized the test-control software,and simplified the measurement in process,to achieve a goal in good which is to detect the dynamic capability for a certain type of wheeled vehicle.
Parameterized Modeling and Finite Element Analysis of the Support of Precalciner
Authors: Yang Zhi Yong , Cheng Gong , Li Liang
Published: June 2012

On the basis of analyzing the structure of precalciner,normalized handling of the precalciner structure,determined parameters of the precalciner model.The fast modeling system of the precalciner is established by using the secondary development tool of SolidWorks software.Using Ansys software,the strength analysis of the precalciner is realized.This system provides a simple and convenient modeling and analysis method for designer.It is helpful to improve the design quality and working efficiency and to shorten the design cycle.
Analysis on the Relation between the Mechanics and the Aesthetics of Machine Structure
Authors: Mao Jun , Tang Lu Jing
Published: June 2012

Along with the development of the science and technology and the change of the views of aesthetics, many novel machine structures appear, at the same time, the compatibility and the paradoxicality between the mechanics and aesthetics are placed before the machine designers. In order to improve mechanical properties of strength and stiffness in designing mechanical structure is easy to fall into misunderstanding that to improve mechanical properties depends on increasing outline dimension and the thickness of materials or selecting high performance materials. Elephantine shape, confusing alignment, incorrect size proportion and grave hue are the results of it. It is just enough to meet mechanical requirements but not ideal for aesthetic effect, increasing the cost. Conversely, it is not advisable to pursue beauty excessively or to make structure stress irrationally. This paper analysis on the harmony and contradiction between the mechanics and aesthetics of the machine, and puts forward some main measures for solving the contradiction.
Study on the Uncertain Problem for Project-Based Remanufacturing Systems
Authors: Wang Qi Feng , Li Cong Bo
Published: June 2012

Remanufacturing is a new manufacturing mode in modern manufacturing environment. This paper had a survey on the uncertain problems in project-based remanufacturing system based on the analysis of the conception of project-based remanufacturing. On the basis, the uncertain problems in project-based remanufacturing systems, which including the uncertain factors, the description approaches for uncertain factors and the strategies to reduce the uncertain influence factors, was studied in detail based on the characteristic of project-based remanufacturing systems.
Neural Network Model and Design Patterns on Fuzzy Evaluation System of Special Electromechanical Equipment
Authors: Ye Jian Ping , Shi Lin Xiang
Published: June 2012

According to the physical characteristics and safety requirements, the evaluation levels of special electromechanical equipment were created. The five-layer neural network model was created according to the multi-layer neural network model. The first layer is input layer, the last layer is output layer, and the others are hidden layers. The software structure of evaluation system was designed, and the main class diagram was designed with UML. The relations among views, data model and dispatch controller were designed with MVC pattern. The factory method was used to instantiate view objects according to the object creation pattern. The ITERATOR pattern of structural pattern was used to find out view objects in the view object aggregation. The strategy pattern of behavior pattern was used to encapsulate different neural network algorithms.
Rotor Critical Speed Calculation Based on Finite Element Method of a Mixed Model
Authors: Wang Jun Feng , Sun Kang
Published: June 2012

Using a mixed model ideas of lumped parameter method and distributed mass method, the affecting factors of gyroscopic moment, supporting stiffness and shear deformation were taken into account, a rotor-bearing system dynamics model was established, use simple geometric features of a one-dimensional beam model, based on the finite element method, a rotor critical speed calculation program was programed by MATLAB software, examples were used to check the program as well, the calculation results showed that the mixed model based on FEM is effective and has a higher precision, it has great reference value for rotor dynamics analysis and design.
Simulation of Bus Ride Comfort under the Excitation of Road Irregularity
Authors: Feng Jin , Chen Yuan Hua
Published: June 2012

Bus vibration is studied by the finite element method (FEM) base on bus structure model. The bus mathematical model of vertical vibration is established and the vibration response variables were deduced with the modal analysis method. The finite element (FE) model is established and decoupled. The transformational relation between spatial frequency displacement power spectral density (PSD) and temporal frequency displacement PSD and the sampling characteristics of the road irregularity PSD in numerical computation are discussed. Road irregularity load is modeled in software. The FE model is solved using modal analysis method and the acceleration PSD of each keypoint can be gained. Finally, a road test experiment is carried on to verify the simulation results. The example indicated that study on vehicle ride comford by FEM has instructive meaning.
The Material of the Resonant Vibration Impact Motivates the Influence of and the Simulation Analysis
Authors: Liu Qiang
Published: June 2012

This paper to the resonant vibration conveying material on the effect of the shock of geologic detailed analysis to research, perfect the resonant vibration against the motive of the dynamic model. Application of the method of harmonic balance system dynamics equation of solution, and draw the conclusion that, under geological body dynamics of the zoom factor amplitude frequency response curve. A test bed to the actual parameters is simulated, on the test, the displacement of the geological time response curve. The results show that: consider material impact and without considering the impact of material, compared the antiresonant frequency decreases, and in the near antiresonance point, the amplitude becomes big bodies.
Usability Evaluation of Welding Clamp Based on Improved Fuzzy Synthetic Evaluation Model
Authors: Li Ji Yan , Yang Zhi Bing
Published: June 2012

Usability is the basic properties of the product, and it is the overall evaluation to the product usability. In this paper, firstly, establish a usability evaluation index system of the welding clamp. Then, use the improved fuzzy synthetic evaluation method to assess the usability of welding clamp. In an improved fuzzy synthetic evaluation model, the index weight which is identified by using AHP method is amended objectively by using entropy technology, the resolution ratio is improved by classifying the differences between qualitative indexes and quantitative indexes. Finally, get the evaluation results of the usability of a welding clamp according to the method above. The result is to some extent valuable, in terms of theoretical research, for improving the usability of welding clamp.
Study on Wind-Induced Vibration Response of Aerial Working Arm
Authors: Jiang Hong Qi , Mao Xian Biao , Li Shun Cai , Liu Yu
Published: June 2012

Since boom-type aerial equipment has complex dynamic characteristic under the action of random wind loads, traditional methods are hard to reflect its dynamic response. We put forward an analysis method for wind-induced random vibration response of aerial working arms based on finite element and pseudo-excitation methods. In this analysis, the pulse-wind-load-induced vibration was regarded as a random vibration under multi-point coherent steady random excitation, and Davenport wind speed spectra invariant with height were adopted with consideration of multi-point wind excitation correlation. We analyzed the wind-induced random vibration of the working arm of a folding-arm-type aerial operation vehicle. The analysis results confirm the reliability of the analysis method, so as to offer a feasible way for analyzing the dynamic wind-induced vibration response of large boom-type aerial equipment.
Fault Diagnosis and Fault Trend Forecasting of Blower Based on Matlab and Wavelet Packet Analysis
Authors: Sun Yan , Lan Yong , Xu Ze Ning
Published: June 2012

The article takes the blower as the research object, uses MATLAB software, extracts the typical fault eigenvalue of blower based on Wavelet Packet Analysis theory, according to the diagnosis mode energy decides fault degree. Establishes the link of MATLAB and database, which is convenient for storing and processing the fault eigenvalue. Forecast and predict the trend of blowers typical fault effectively through the application of the Grey prediction theory. Predicted results are very close to measured data, which proves the methods validity.
Research of Limitation and Cooperation Relationships of Pulleys and Bushing Based on Temperature Field
Authors: Wang Hui Ping , Wang Zhong Qi , Kang Yong Gang , Hu Zhi Ming
Published: June 2012

Pulleys and bushing have different linear expansion coefficient, relatively sliding may occur between them when hated, therefore, we have to ensure that there's enough interference volume within pulleys and bushing. First of all, using simplify numerical method calculated theoretical extreme temperature, then taking simulate analysis with ABAQUS finite element analysis software, through the change of CPRESS and COPEN in different temperature field, extract the extremely working temperature of aluminum pulleys. and then determined the limitation and cooperation relationships by comparison.
The Control of the Gap between Tool and Support, and the Analysis of its Effect on the Accuracy of CNC Incremental Forming
Authors: Zhu Hu , Liu Zhi Jun , Li Nan
Published: June 2012

Two kinds of methods for the control of the gap between pressing tool head and support in CNC incremental forming have been discussed (i.e. pressing path adjustment method and support shape adjustment method), and whose effects on forming accuracy are analyzed by using the Finite Element Analyses. The methods for the generation of pressing paths and supports have been given for the two forming method of the pressing path adjustment and support shape adjustment, and the Finite Element Analysis models have been built for them respectively. The method of digital simulations for the two forming cases mentioned above based on the ANSYS/LS-DYNA software has been presented and the forming precision of the two forming methods are analyzed through the comparison of digital simulation results.
Research on the Grinding Mechanism Based on the Cutting Simulation
Authors: Zhang Hong Xia , Chen Wu Yi
Published: June 2012

Grinding of metals is a complex material removal operation. Research on cutting process of a single abrasive grain is the basis of further understanding of grinding mechanism. In this investigation, the simulation and analysis for the non-uniform thermo-mechanical coupling intense stress fields in cutting zones of a single abrasive with negative rake are conducted by means of the FEM techniques. The cutting forces, the cutting temperature distribution and the strain rate in cutting zone are numerically demonstrated. Grinding mechanics are analyzed from microscopic view according to the simulation results. Research results facilitate a better understanding on the mechanics of grinding.
High-Frequency Inducting Plate Bending Forming with Gravity on Different Thickness Ship Plate
Authors: Zhang Ji Xiang , An Guo Yin , Li Zheng Jun , Wang Zhi Xiang
Published: June 2012

In this article, a FEM model of high-frequency induction bending with gravity is established and with which the heated temperature, stress, deformation, residual stress and bending angle after cooling, etc are studied on different thickness ship plate. The results show that the steel plate can be heated to 860 above the austenitic temperature. Heating temperature is gradually decreased as the thickness increase, while there is a fluctuation in the late. As the plate thickness increases, in mm, the bending angle of the plate gradually decreases, and gradually increases in 8mm14mm, and then decreases in the late. Under the given heating conditions, thin plate and the mm thick plate have the best result of deformation. The stress in heat area reaches to the yield stress of Q345, and promotes plastic deformation due to the role of heating temperature gradient and gravity. When the plate has cooled, the residual stress is mainly concentrated at the bottom of the coil.
The Dynamic Simulation of Contact Force between Wheels and Ground Based on ADAMS
Authors: Li Zhi Sen , Wu Hai Tao , Liu Hong Bin
Published: June 2012

Contact force is a complicated force in practical problem. By using the powerful function of ADAMS in dynamics analysis, we can solve it in a comparatively accurate way. Since a number of parameters are involved in the simulation in ADAMS, the initialization of them has a great influence on the simulation. Aiming at the contact force between wheels of wheel chair and ground, the value of the parameters was calculated and analyzed in this paper. The main research object in this paper is the parameter of the ADAMS/Solver. The result of the dynamics simulation is also used to test whether the parameters are defined properly or not. With this method, we find a better way to define the parameters in ADAMS.
The Influence of Cutting Depth on Residual Stresses when Orthogonal Dry Cutting GH4169 with High Speed
Authors: Xu Ying Qiang , Guo Cai Hong , Shi Zu Heng
Published: June 2012

An finite element model of orthogonal dry cutting with separate line is established according to the constitutive relation of large thermo-elastic-plastic displacement and the principle of virtual work in metal plastic deformation process,. The influence of cutting depth on residual stress was simulated for materials GH4169 with high speed. The residual stresses are analyzed on the machined surface and subsurface. The result shows that tensile residual stress of the machined surface is minimum value when the cutting depth is 0.2mm. the deeper is the depth of cut, the large the augmentation of compressive stress on the subsurface, which proves foundation for cutting process of dry-machined difficult-to-machine material with high speed and make it more efficiently to control the integrity of the machined surface.
Application of Image Enhancement Technology in Bubble Dimension Measurement of Deinked Pulp Flotation Column
Authors: Sun Li Ying , Li Qiong Yan , Hua Qian , Tian Ye
Published: June 2012

A substantial increase in demand of paper causes a severe shortage of wood, paper recycling have become increasingly important; Deinked pulp flotation column has the features of less site area, good treatment efficiency, easily control and so on, which can be wildly used in fiber recycling in abroad. This thesis uses the working principle of ore dressing to recycle secondary fiber in order to apply flotation column in wastepaper recycling. And meanwhile this article primarily study on deinked pulp flotation column which is imported from Canada, and drawing 2D maps of flotation column, Meanwhile comparing the application of image enhancement techniques in bubble dimension measurement of deinked pulp flotation column.
The Application of Siemens S7-200 PLC Based on Waste Automatic Test System
Authors: Yang Yan , Yang Wei Ping , Wang Xin
Published: June 2012

This paper with Siemens S7-200 PLC as core controller, has realized automatic transmission device of waste automatic test. The system hardware, software design are described, and using WinCC Flexible configuration software on human-computer interface configuration, to achieve the production line equipment real time control and status monitoring. Finally, the summary of the thesis, and put forward some further research prospect.
Research on the Clearance Seal in Stirling Refrigerator
Authors: Yang Dong Ya , Lei Zhen Ning , Gong Jun , Gao Gui , Ma Qin Fan
Published: June 2012

The regenerator of Stirling refrigerator is normally installed a contact sliding sealing ring, but if the sliding sealing ring working hour is overlong, it would cause wear heavily, and reduce the service life. This paper focus on resolving this problem: use a clearance seal device, which without leakage under the high pressure test, instead of the sliding sealing device. Meanwhile, use the clearance seal device would eliminate contact wear which would cause the leakage losses. Therefore it is fairly important to establish a theoretical model to imitate leakage process in the clearance seal device, analyze the factors which influence clearance seal, and find a solution to improve clearance seal in Stirling refrigerator.
Research of Amplification Frame Optimization Based on Optistruct
Authors: Zhong Bing
Published: June 2012

The motion of amplification frame of dumper was simulated by multi-body dynamics simulation software ADAMS, and the danger working conditions of amplification frame were calculated. The stress of amplification frame was simulated and analyzed by Optistruct software. The results show that the stress distribution in amplification frame is not uniform and it is big in the middle and small in the edge zeros. The structure of amplification is optimized according to the simulation results. The utilization ratio of the material increases and the cost of production decreases after structural optimization.