bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Analysis of Coupled System of CO2 Transcritical Heat Pump and Rankine Cycle
Authors: Wang Hong Li , Tian Jing Rui , Ma Yi Tai , Hou Xiu Juan
Published: July 2011

Based on thermodynamic principles, the coupled systems performance of the Rankine cycle and the transcritical CO2compression cycles with a throttle valve and the cycle with an expander were analyzed, respectively. The results show that the corresponding maximum performance in transcritical CO2heat pump, there is an optimal efficiency of the coupled system. With the temperature increasing of boiler feed water, the efficiency of the two coupled system showed an increasing trend; with increasing of discharge pressure of condenser or outlet temperature of gas cooler, both of the two kinds coupled system efficiency showed a downward trend. Under the same conditions, the efficiency of the coupled system with an expander is better than the system with a throttle valve. This paper can provide the fundamental datum for the power plant waste heat recovery.
Optimal Design for Partial Inertia Force Cancellation in Ultra High Speed Pressing Machine
Authors: Bai Jian Yu , Yu Zaihe , Tong Sen Lin , Zheng Di
Published: July 2011

The severe vibration and noise caused by inertia forces within a manufacturing machine are often the bottleneck in increasing the manufacturing speed. Based on kinematics analysis of the applied driving mechanism, this paper proposes an optimal design method for partially canceling the inertia force in pressing machine by using limited number of weight-balancing blocks. The proposed method has been validated by simulations.
Finite Element Analysis on Axial-Torsional Coupled Vibration of Drill String
Authors: Bi Xue Liang , Wang Jian , Wang Zhan Lin , Sun Shi Hui
Published: July 2011

In the drilling process, axial vibration, transverse vibration and torsional vibration happen to drilling string. And the coupled vibration is more complex. In the resonance state, drilling string collides with the wall, which causes serious damage on drilling string in a short time and results in economic loss to the drilling operation. In this paper, the regularity of coupled vibration is analyzed by using finite element method. The model of full-hole drilling strings is established. The distribution regularities of coupled resonant frequency are obtained through computer analysis. The coupled model is more accurate than single vibration model. And the gaps of high rotary speed resonance regions are larger. Resonance state can be avoided by changing rotary speed, and drilling accidents can be reduced.
Study on Dynamic Characteristics and Dynamic Response of Woodworking Four-Side Planer
Authors: Zhang Shao Qun , Hua Jun , Xu Wei
Published: July 2011

Through woodworking four-side planer vibration test, this article studiesits dynamic characteristics and dynamic response to identify the vibration magnitudes law of each feed roll shafts of the four-side feed beam; then finds the natural frequency and damping ratio of the feed beam and lathe bed; obtains the mathematical model of feed roll shaft vibration magnitude changing with the feed rate U under different process thicknesses. The analysis of feeding quantity and the rationality of lathe bed from the perspective of vibration design supplies the designs and operation staff with reference data.
Effects of High Density Ultrasonic Field Coupling on the Microstructures and Properties of Al-Si Alloy
Authors: Li Ying Long , Ding Hua , Cao Fu Rong
Published: July 2011

The effects of high density ultrasonic field coupling on the microstructures and properties of Al-12Si alloy were investigated. It is shown that when the melt undergoes ultrasonic coupling processing prior to solidification, the nucleation rate of liquid phase can be raised to make α(Al) dendrite transform towards near equiaxed grains, the growth of Si phase is restrained and eutectic Si microstructure is refined due to acoustic streaming effect and thermal mechanism; When the melt undergoes ultrasonic coupling processing during the melt solidification, large degree of supercooling is produced in the liquid phase in the solidification interface front edge to reduce the critical radius of crystal nucleus and critical work of nucleation and break up, rupture by melting and refine the Si phase to improve obviously the strength of Al-12Si alloy due to its cavitation effect, acoustic streaming action and heat undulation; The crushing effect of ultrasonic coupling on Si phase occurs mainly during the crystallizing solidification and threshold sound intensity exists.
Identification of Acoustic Emission Signals Based on Multi-Resolution Correlation Filtering
Authors: Zhang Tong Hua , Guo Min , Yan Xiong
Published: July 2011

An approach of multi-resolution correlation filtering was presented to identify the transient responses of acoustic emission (AE). Two techniques were combined to avoid computational difficulties and obtain high identification efficiency. Wavelet multi-resolution analysis was first employed to decompose the original signal into a set of levels that correspond to different frequency bands. Using Mallat fast algorithm, the reconstructed signal in a certain level was obtained, which retained the main information of the original signal. These resulted in a considerable reduction in the data and a reduction in the computational time to perform correlation. Technique of Laplace correlation filtering was then used to identify frequency and damping characteristics of the reconstructed signal. Computational results demonstrated the accurate identification of the transient response of both a synthetically generated signal and actual acoustic emission testing signals. As a result, the approach of multi-resolution correlation filtering could be effectively utilized in AE detecting.
Design and Test of Silent Chain Including Silicon Fluorine Rubber Link Plate
Authors: Liu Xiao Lun , Ding Song , Sun Wei , Wang Wen Cheng , Liu Jia Jun , Jiang Bin
Published: July 2011

In order to reduce the meshing noise of silent chain drive, a new concept of the chain (silent chain including silicon fluorine rubber link plate) was proposed. It could change the meshing contact state by changing the shape of traditional steel chain plate and arranging the silicon fluorine rubber link plate reasonably, which reduced meshing impact, so the meshing noise was reduced. Through the platform contrast test, a noise test was made with different types of silent chain at the same speed, and the results shown that the silent chain including silicon fluorine rubber plate drove more smoothly than other silent chains, the level of noise was reduced 2dB～3dB, which verified the fact that the silent chain including silicon fluorine rubber link plate could reduce noise.
Piezoelectric Equation and Two Types of Piezoelectric Sensors Model
Authors: Yao Jun , Zhu Zhen Yu , Wang Huan
Published: July 2011

This paper discusses four types of piezoelectric basic equations, and there are two piezoelectric sensors which are composed of piezoelectric ceramics tightly pasting in the thin-walled structure. They can respectively measure structure of strain and strain rate changes. Based on the description of two kinds of piezoelectric sensors formation, The output display solution and their frequency domain forms are furtherly presented, and the advantages of the sensor are discussed. This conclusion can provide theoretical guidance for structural vibration active control.
Modal Analysis of the Iced Transmission Line Based on Three-Dimensional Curved Beam Element
Authors: Xiong Hui , Li Zheng Liang , Yan Zhi Tao
Published: July 2011

The accurate calculation of transmission line modes is very important for power line design, the dynamic properties, anti-vibration, anti-galloping analysis. However, the existing simplified theories and models will Cause large calculation error. Based on the strain - displacement relationship of spatial curved beam theory, a three-node curved beam power line element was realized, which was used to take a modal analysis. The results show that the curved beam element used to calculate modes of power line is accurate. The results of the analysis were compared with results of only considering translation of power line, results of considering axial deformation and bending. The results of parametric analysis show that the bending cross-section modulus of the transmission lines has a greater impact on the translation and rotation frequency. The iced conductor eccentricity can slightly reduce the frequency of wire.
Vibration Cosine Solutions of Free Orthotropic Rectangular Plates on the Elastic Half-Space
Authors: Wang Chun Ling , Ding Huan , Zhang Hai Xia
Published: July 2011

In this paper, the analytic solutions of steady vibration of free orthotropic rectangular plate loaded with vertical steady loading on the elastic half-space was given by combining the general solution of double trigonometrically cosine series with supplementary terms with dynamic integral representations for displacements of the elastic half-space loaded with arbitrary vertical steady loading. This solution not only is four-order derivative, but also has less undetermined coefficients. It can be used to solve the problems of bending and steady vibration of orthotropic rectangular plates on the elastic half-space without be classified and be superimposed. This causes this kind of things, bending and steady vibration of orthotropic rectangular plates with four free edges on the elastic half-space, unionization, simplification and systematization. When the material is isotropic, the solutions are turned into analytic solutions of steady vibration of free rectangular plate on the elastic half-space. At last some computational examples are presented and the results are coincided with those in literatures. Then the method in this paper will be of important practical applications.
An Analytical Solution for Stress and Displacement in Casing-Cement Combined Cylinder under Non-Uniform Loading
Authors: Fan Mu Hui , Jiao Yong Shu , Cai Zong Xi
Published: July 2011

Based on the theory of elasticity and taken the casing-cement sheath as a totally contacted composite cylinder subjected to arbitrarily distributed loading on inner and outer surfaces, an analytical solution in Fourier serial form was obtained for stresses and displacements. A computer program was developed to evaluate the stress and displacement in the combined cylinder. The results are in good agreement with those from the finite element method (FEM). With these solutions we can investigate the interaction between casing and the cement sheath. This is of importance in improving the design of casing.
Study on Reliability and Safety of Automatic Speed Control System Based on Dual Redundant Model
Authors: Yu Jian Zhi , Chen Yong Sheng
Published: July 2011

In order to guarantee the safe operation of train and improve the operation efficiency, a kind of failure-safety control strategy of system is proposed based on the dual-redundant control mechanism. The paper analyzes the function requirement of train automatic speed control, researches on the design principles and methods of the architecture design of the dual-redundant control system which is based on the tolerance theory, analyzes the control strategy of the system running state translation, uses Markov model to analyze the system reliability and safety. Finally, a series of simulation analysis are performed, and the results show that the system has good reliability.
Reliability of Cermet Cladding Parts Based on the Failure Tree Series
Authors: Yang Jun Ru , Zhang Li Li , Zhang Cheng Xin , Li Zhao Qian
Published: July 2011

Based on failure mode analysis of the cermet cladding part, the last layer failure assumption is adopted and the method to establish reliability model of the cladding part based on the failure tree series is proposed. Theoretical and example investigations are carried out. The failure tree series for the failure process of the cermet cladding part under the mechanical impact are established.
Finite Element Analysis on Thermal Characteristic of the Headstock of NC Machine Tool
Authors: Zhang Yao Man , Liu Qi Wei , Han Jia Liang
Published: July 2011

The final manufacturing performances of the machine tools will be influenced by its thermal characteristics seriously and accurately predict thermal characteristic is helpful to improve the machine design level. Based on the analysis on factors that influence machine thermal characteristic, finite element analysis model of the headstock has been constructed, and the steady temperature field distribution and thermal equilibrium time calculation of the headstock are calculated, and then the temperature field and thermal deformation of the headstock under the action of heat and structure load have been calculated, and analysis to identify the trend of the spindle assembly and headstock heat distortion are also been done. The analysis reveals the machine processing performance influence will be influenced by the hot asymmetric, the study give priority to spindle assembly of optimization design, thermal error compensation.
Powder Mixed EDM Stirrer Designing and Simulation
Authors: Tang Lin , Guo Yong Feng , Wang Mu Xi
Published: July 2011

This paper analyzes the falling process of powder for EDM mixed with powder, and proposes a stirring method for keeping equal powder concentration. Designing and imitating the stirring trough for EDM working fluid. It’s optimized that the radius of sphere bottom R=0.8T, the radio of deep and diameter is 0.8, The rotate speed n equals 20 rad/s, and the impeller is part from the bottom 100 to 150 millimeter, the whole circulation speed is good and it’s benefit for the powder equal suspend.
A New Approach to Integrating Algorithm Modules in CAD Software Applications
Authors: He Yun Qin , Liang Guo Zhu , Shen Xu Kun
Published: July 2011

This paper comes up with a new general-purpose approach to integrating algorithm modules in all kinds of CAD software applications. In algorithm module integration of mechanical engineering areas, the new approach uses round-robin calculation of algorithm modules instead of traditional hard-coding or specialized configuring methods. Drawbacks of traditional algorithm module integration approach are analyzed in detail, and then the new approach is put forward and discussed accordingly. Using the new approach in CAD software applications, engineering fields can reinforce reusability of algorithm modules; implement parallel calculating of algorithm modules, and increase flexibility of algorithm module integration in engineering tasks. Most of all, it can improve engineers’ work and raise their efficiency.
Different Finite Element Software on Electric Field Analysis of Magnesium Electrolysis Cell
Authors: Liu Cheng Lin , Sun Ze , Zhao Yun , Song Xing Fu , Lu Gui Min , Yu Jian Guo
Published: July 2011

The electric field distribution was the main factor affecting on the current efficiency of electrolysis cell. So, the electric field distribution of magnesium electrolysis cell was studied to improve the current efficiency by two of main finite element softwares, COMSOL and ANSYS. The electric field distribution and its trends with the electrolyte change from 1.25m to 1.40m were calculated by using the two softwares. Form the results, the characteristics of COMSOL and ANSYS can be obtained. The conclusions of the paper will provided a significant reference for choose the appropriate software in practice process.
Research on Vehicle Ride Comfort Based on Virtual Prototyping Technology
Authors: Chen De Yang , Yi Feng Yan
Published: July 2011

In this paper, based on some kind of Car as the prototype, by using the multi-body dynamic analysis software ADAMS, the author Uses ADAMS／CAR modules establishes front Suspension, Rear Suspension, steering system brake system,body,tires and other models, then assembled into vehicle model, Established B,E-class road model as entering the road for vehicle ride comfort simulation analysis. Vehicle on different road ride comfort simulation, According to international standard ISO2631 and the vehicle for evaluation of ride comfort, the car are proved to be high performance in the ride comfort．
Design and Implementation of Virtual Royal Garden in Northern Song Dynasty with Stereoscopic Display
Authors: Zhang Yan , Yang Gang
Published: July 2011

With the development of virtual reality technology, using the VR technique to realize landscaping planning and ancient architecture reconstruction has become a hot research and application topic. In this paper, we use VR technique to restored the scene of the famous painting which named " Riverside Scene At Qingming Festival" by Mr. Zeduan Zhang who was a famous painter in Northern Song Dynasty. In construction of the 3D ancient scene model, this paper consultes and analyses many references about the building spatial form of the imperial garden in the Northern Song Dynasty, and put forward the method for constructing the 3D model of ancient architecture. The real-time roaming system is constructed based on the VR Platform Virtools. In addition, we research and implement the stereoscopic displaying in the roaming system by using the shading programming technique of Vritools. Experimental results show that our system provides a very immersive impression for the virtual exhibition of ancient scenes. The modeling method put forward in the paper provides a good reference for the construction of ancient architecture.
Effect of B4C-Yb2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials
Authors: Shen Shu Bin , Bu Jing Long , Yu Li Xue , Wang Zhi Fa , Wang Rong Lin , Wang Rui Sheng
Published: July 2011

Fused quartz granules (d50=19 μm) were used as raw material, and B4C-Yb2O3 (1:1, in mass) was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1250 °C, 1300 °C, 1350 °C and 1400 °C for 1 h. The apparent porosity, bending strength and thermal expansion ratios of the samples were examined and they were analysed by means of XRD and SEM. The results showed that the sample sintered at each temperature with 3% B4C-Yb2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% B4C-Yb2O3 was conducive to sintering of fused quartz ceramic materials. The results of XRD analysis and thermal expansion ratio analysis showed that 3% B4C-Yb2O3 compound additive had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the 3% B4C-Yb2O3 compound additive plays the excellent role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.
The Numerical Simulation and Optimal Design of Nozzle Jet for Gas-Fluid Two Phase Flow
Authors: Li Yan Min , Ma Fei
Published: July 2011

Taking a nozzle jet for gas-fluid phase flow as a research object, the influences of the main structural parameters on the vacuum in the internal suction volume are analyzed. Utilizing the software FLUENT to simulate the gas-liquid two-phase flow in nozzle jet with different structural parameters, the pressure distributions are obtained and the relationship between the structural parameters and the vacuum in the suction volume is concerned. The results show that the vacuum in the suction volume of jet reaches the maximum when these structural parameters are some certain values. The research is helpful for the optimal design and performance testing of nozzle jets.
Research on Component Attributes in Domain Problem Solving
Authors: Gao Chang Qing , Su Huan Huan , Yang Bo , Lv Bing , Wang Yu Zeng
Published: July 2011

Function analysis is a key step during conceptual design process for function reasoning, which is also useful for the confirmation of conflict. And resolving conflict is regarded as the essence of invention in view point of TRIZ. Component attributes are the necessary information for a function model. The classification of the available resource and the component attributes is the base for searching specific solution for the domain problem. The methodology and application of component attributes in conceptual design are discussed in this paper.
Effect of Bacteriostats on Cells Growth and Contamination-Resistant Capability of Rhizobium Inoculants
Authors: Li Jian Feng , Huo Ping Hui , Shi Shang Li , Zhang Shu Qing , Chen Li Yu
Published: July 2011

The purpose of this study was to evaluate the effect of ampicillin as bacteriostats on the doubling time and relative survival rate of antibiotic resistantRhizobiumstrains and the ratio of undesirable microbes in artificially polluted inoculants during 60 days storage, and the nodule occupancy of two bacteriostat-resistant strains were also investigated. Fully grown Yeast-mannitol liquid media culture ofRhizobiummeliloti LW107 andRhizobiumsp. RSW 96 were added with ampicillin as bacteriostats at various concentrations in an artificial pollution test, and the relative survival rate of rhizobia and the counts of undesirable microbes were determined by the agar plate dilution method. The result shows that in the artificially polluted liquid inoculants, the survival rate of rhizobia was increased and the ratio of undesirable microbes declined significantly when the ampicillin was used as the bacteriostats. The growth of selected antibiotic-resistant strains was promoted at the concentration of less than 100 ug/ml and the doubling time was reduced, but inhibited and the doubling time was significantly prolonged at the concentration of more than 200 ug/ml. Inoculation tests also shows an increased nodulation competitiveness of two bacteriostat-resistant strains in five-fold dilutions of liquid inoculants containing ampicillin (at optimal concentration). According to comprehensive consideration, the optimum concentration for ampicillin as bacteriostat inRhizobiummeliloti LW107 andRhizobiumsp. RSW 96 inoculants appeared to be 100 ug/ml and 200 ug/ml, respectivly.
The Fast Measuring and Processing Method of 3D Measuring System in Reverse Designing
Authors: Su Fa
Published: July 2011

The paper introduce that composing, principle and application example of a 3D Measuring system. It mainly applies technique of digital image processing, photogrammetry, optical grating measuring technique , in order to measure rapidly and correctly geometric data of a 3D –Object’ surface,Spots clouds data can be processed by ATOS system’s soft. The system supplys a rapid method to product fast measuring.
Application and Design of Plunger Pump Lifting Viscoelastic Fluid
Authors: Li Juan , Yang Hong Zhi , Han Mei , Xu Jin Chao , Li Xiao Dong , Han Xiu Ting
Published: July 2011

Daqing Oilfield has more than 10,000 million kilograms of oil through tertiary recovery every year. However, eccentric wear of sucker rod and tubing severely impede the implementation effectiveness and large-scale utilization of tertiary oil production when injecting viscoelastic fluids containing polymer. Therefore, a plunger pump lifting viscoelastic fluid is designed based on the analysis of the mechanism of eccentric wear. The principle to reduce eccentric wear is increasing hydraulic and viscoelastic friction, and expanding clearance. Due to make use of the plunger pump lifting viscoelastic, laboratory experiment and field application have demonstrated effective reduction of eccentric wear, extend the life of the sucker rod and tubing, and improve pump efficiency.
Effect of Gas Injection Condition on Fluid Flow in a Two-Strand Tundish
Authors: Li Jiao , Zhu Jing Tao , Li Jing She , Sun Li Yuan
Published: July 2011

A water modeling approach was employed to investigate the effects of gas injection condition on the fluid flow in a two-strand tundish. The rational parameter of argon injection was determined as the optimized positions. Adopting the Case of weir-gas-dam could prolongs fluid’s retention, stagnation and peak periods in the tundish properly. The dead zone could be reduced to 17.4%. The flow pattern which was oberved with ink showed that the flow condition was improved greatly in Case 2(WGD), favoring the mixture of liquid steel and the inclusion removal.
View Angle Characters of the Chiral HAN-Mode LCD
Authors: Yu Nan , Li Guo Ying , Huang Zi Qiang
Published: July 2011

Calculation of the LCD director and transmission based on the continuous elastic theory, difference iterative method, and the Berreman’s 4×4 matrix method is shown. The realization of this procedure is in Visual C + +. We made a Visual C + + and Matlab interface to achieve the call of the required function out of Matlab. In the case of TN-type LCD, the software has been validated to be correct and reliable. The chiral HAN-mode was described by our laboratory which characteristics were not clear. Transmission has been calculated by using the software with different parameters. The results of the contrast - viewing angle curves show that: the chiral HAN-mode liquid crystal display can achieve wide prospective. We found the optimal setting parameters: Δnd = 0.48μm, p0= 5 μm, any wavelength of visible light, and the polarizer angle =90° to achieve wide prospective from -85 ° to 85° in the horizontal direction.
Numerical Simulation of Internal Flow in Stamping and Welding Multistage Centrifugal Pump
Authors: Liu Yuan Yi , Li Rui Guang , Sun Kai
Published: July 2011

Based on the Reynolds time-averagedN-Sequations and standardk-εtwo-equation turbulent mode, using multiple reference model and wall function method, the inner flow fields were simulated which is a part of three different kinds of impeller on stamping and welding multistage centrifugal pump by CFD software FLUENT. The characteristic of internal flow on multistage pump was analyzed base on the calculated results, so as to reveal how the flow regulation influences performance of pump. The result shows the internal flow condition in the distort-type impeller pump is more reasonable than the other two groups, there is not the flagrant whirlpool and the capability of cavitation-resistant is strong.
Digital Signal Processing for Open-Loop Fiber-Optic Gyroscope
Authors: Zhang Wei , Chen Yu Zhong , Song Zhang Qi , Yang Ming Ye
Published: July 2011

Digital open-loop fiber-optic gyroscope detection scheme based on sinusoidal phase modulation is introduced. A novel implementation of the detection scheme is developed with digital signal processor (DSP) and field programmable gate array (FPGA). The design and implementation of the detection system are discussed. Timing control and open-loop signal preprocessing are realized in FPGA. Rotation rate calculation is finished in DSP. Experiments result shows that good performances have been achieved and the implementation scheme is of great practical value.
The Fluorescence In Situ Hybridization Approach Applied in the Study of the Denitrifying Bacteria on Nitration Tank of the Metal Membrane Bioreactor
Authors: Zhang Pan , Chen Lei
Published: July 2011

To study the amount changes of different denitrifying bacteria in the process of the metal membrane bioreactor, and to confirm the relationship between the amount of different bacteria and the quality of the treating water, the fluorescence in situ hybridization (FISH) dominant molecular biological technologies were applied in this study to preliminary explore the time and space distribution of different denitrifying bacteria populations in the active sludge on the immersed plate-type metal membrane bioreactor. The result indicates that the involvement of the denitrification tank is beneficial to the growth of all bacteria and nitrifying bacteria, meanwhile the eliminate rate of the total nitrogen and ammonia nitrogen is also improved.
A Novel Dimension Measurement System of Hot Large Open Die Forgings
Authors: Liang Jin Tao , Zhao Sheng Dun , Zhao Jian Wang
Published: July 2011

In this paper, based on the analysis of the problem about manual measure for hot large open die forings and the significance for realizing noncontact online measure, a novel dimension measurement system of hot large open die forgings is presented. Laser ranging method is used for measuring axial dimension and binocular vision method is used for measuring radial dimension, so that the system characterized by large size, automated, fast response and high precision which benefits high efficiency and low material loss in open die forging process.
Rotation Shaft Twist Angle Measurement Based on Moiré Fringe and Error Analysis
Authors: Zhao Hao
Published: July 2011

Torsion test is an important means of determination engineering materials mechanical properties, a high accuracy twist angle measurement method is designed. The twist angle signal is acquired through grating and infrared photocell by Moiré fringe, then interpolation twist angle signal with high-frequency pulses, so as to convert it to pulses, the twist angle is received by processing pulses. This measurement system combined with FPGA and SCM, the function of FPGA are generating pulses、interpolating twist angle signal and counting the pulses, the result of count is processed by SCM. The twist angle accuracy is 0.002°.According to the experiment results, and the main errors of this system are received, they are signal processing error、electric conversion error and concentricity error. The errors sources are analysed, disposal methods for the errors sources are presented.
Design of Plasma Cutting Tracking Device for Spiral SAW Pipe
Authors: Wang Chang Long , Yuan Ting , Dong Cheng Lin , Zhan Feng Wei
Published: July 2011

A set of plasma cutting tracking device for spiral SAW pipe was designed. This system is consist of two speed sensors, DC servo motor, gear retarder, a vehicle with plasma torch drove by double screw and nut, speed proportion regulating circuit for vehicle and steel belt based on single chip microprocessor. Tracking and controlling soft ware was programmed in STC12C2052AD.
Design and Implementation of Automatic Drainage in Coal Mine
Authors: Liu Zhi Hai , Zeng Qing Liang , Wu Zai Chao , Zhou Guang Yu
Published: July 2011

Drainage system is one of the important sub-systems of coal mine integrative control platform[1], and is used to guarantee the safety of mining and auxiliary transportation under the ground. The functions of drainage system are defined, the network framework is designed, the start and stop procedures of the pump engine under the manual control mode and automatic control mode are described, and the determining methods based on liquid level to control several pumps in automatic mode are analyzed. By using Simense PLC module, power source module, digital module, analog module and touch screen hardware, the drainage system control platform is set up, which is connected to the control computer on the ground by using Simense communication module and industrial ring Ethernet[4], and achieved the purpose of remote control.
Research on Indirect Stator-Quantities Sliding Model Control for Induction Motor
Authors: Zou Li Hua
Published: July 2011

In direct torque control system for induction motor, the system has big torque ripple and strong noise caused by torque ripple. In indirect stator-quantities control, a slip frequency controller, based on power frequency exponent integration reaching law sliding model, is adopted by using practical measure velocity and calculation torque of motor flux model. The slip frequency error is fast convergent and stable in the nearby zero value, the method reduces torque ripple and improve dynamic and stable performance. The stability analysis of the scheme is given by using Lyapunov method. The simulation results verify the effectiveness and correctness of the method.
Modeling Variation Propagation Based on State Space and its Application to Dimensional Variation Prediction in Shipbuilding
Authors: Liu Xiang Rui , Zhang Zhi Ying
Published: July 2011

Dimensional control is one of the most important challenges in shipbuilding industry. In order to predict assembly dimensional variation in block construction of shipbuilding, a variation stream model based on state space is presented in this paper, which can be further applied to accuracy control. Both locating error and welding deformation are taken into consideration in this model, and variation propagation mechanisms and accumulative rule in the assembly process are analyzed, then, a model is developed to describe the variation propagation throughout the assembly process, finally, an example of flat block construction is given to provide this method is effective and useful.
Centering Performance Analysis of Static Balancing Measure for Marine Propeller
Authors: Zhang Jian Guo , Wang Cun Tang
Published: July 2011

The working principle of the fully hydraulic static balancing machine with high accuracy is introduced, which is used to check marine propeller balance degree. First of all, the measuring precision of the apparatus is discussed, which is usually effected mainly by the mechanical centering error of the propeller measured. Then, the methods to eliminate the error are brought forward. The conclusion from the previous analysis and research has significance for improving of the static balance measuring degree of marine propeller.
Research on Feedrate Optimization Based on Cutting Force Model with Double Effect for the Ball-End Milling
Authors: Cai Yu Jun , Shen Hua , Qi Tie Li
Published: July 2011

A new cutting force model of ball-end mill with double effect is developed through analysing the machining process by using differential geometry. The cutting force model is needed to be revised for the component force in Z direction because of the offset to the actual results. The cutting force and the ball-end milling force coefficients can be given with numerical method. A feedrate optimization strategy is also proposed based on the developed cutting force model and tested effectively.
Development of Recycled TiH2 Feedstock for Powder Injection Molding
Authors: Cha Bermha , Jang Jin Man , Lee Won Sik , Seo Jung Sik , Ko Se Hyun , Son Seong Ho , You Woo Kyung , Lee Jai Sung
Published: July 2011

Powder Injection molding (PIM) is a cost-effective process for the fabrication of complex shaped parts, and has a great potential in many applications. In this work, an improved wax-based binder was developed for the powder injection molding of TiH2 powder fabricated by recycling of Ti chip. Fine TiH2 powders of about 350 nm in particle size were produced by attrition milling of Ti chip in less than five minutes, resulting from simultaneous self-propagating High temperature Synthesis (SHS) and fracturing. TiH2 feedstock, a mixture of binder and powders, was fabricated with critical powder loading of 68 vol.%. The rheological characteristics of the feedstock were investigated for subsequent processing step. Viscosity of the feedstock showed pseudo-plastic flow behavior and to optimize injection molding parameter, in-mold rheology curve was generated. The results indicated that the recycled TiH2 feedstock can be used for the fabrication of the complex shaped parts with good shape.
Color Separation Technique of Jacquard Fabric and the Improved Method Thereof
Authors: Luo Bing Jing , Shao Ling Ling
Published: July 2011

Three traditional color separation methods such as automatic color separation of fabric CAD, self-defined primary color separation and spot color separation are analyzed by comparison , the advantages and disadvantages of color separation based on cluster analysis are discussed by tests . On this basis, an improved fabric color separation method is put forward based on genetic fuzzy clustering algorithm, and the experimental results show that the fidelity of fabric patterns after color separation using this improved method is superior to that after color separation using traditional color separation method.
Research on Reusable and Sharing Manufacturing Resource Based on Command Intelligent Multi-Agent
Authors: Shang Xin , Liu Jing , Yin Guo Fu
Published: July 2011

Aiming at key problem of sustainable development of modern manufacturing enterprise how to intelligent reuse and share manufacturing resource of enterprise. Command intelligent multi-agent technology was proposed. in this method, in order to smart reuse and share manufacturing resource of enterprise , reconfigurable modules(resource carrier, command agent)play a control role, when these modules were reconfigured, it communicated with agent of manufacturing resource, then the relevant sub-agent of manufacturing resource was reconfigured based on command; so these manufacturing resource were reused and shared in new modules. Then, Command intelligent multi-agent system and organization were discussed; finally, a case that organization command agent was simple discussed.
Development of Processing Maps for 3003 Al Alloy
Authors: Chen Gui Qing , Fu Gao Sheng , Yan Wen Duan , Cheng Chao Zeng , Zou Ze Chang
Published: July 2011

The 3003 Al alloy was deformed by isothermal compression in the range of deformation temperature 300-500 °C at strain rate 0.0l-10.0 s-1with Gleeble-1500 thermal simulator. Processing maps at a strain of 0.6 for hot working were developed on a dynamic materials model. The maps exhibit a flow instability domain at about 300 °C-380 °C and 1.0-10.0 s-1. DRX occurs extensively in the temperature range of 450-500 °C and at the strain rate of 10.0 s-1. The optimum parameters of hot working for 3003 Al alloy at the strain of 0.6 are confined at 500 °C and 10.0 s-1with the highest efficiency (37%).
Progress on Investigation of Pores During Selective Laser Melting of Metal Powders and Future Work Discussion
Authors: Liu Jin Hui , Xie Wen Juan , Wei Qing Song , Wang Li
Published: July 2011

Pores are always considered as a kind of defect during manufacturing metal parts via many conventional processes. But porous metals have outstanding physical and mechanical properties which providing them double natures of function and structure, and are applied in many fields of science and technology. Selective laser melting (SLM), developed within current years, has the advantages of producing metal parts with complex structures, and can be used to manufacture complex structures of any kind theoretically. A new method of making porous complicated metal structures via SLM is put forward. Then, the meaning of this method, research advance and future work discussion are presented in this paper, which lays a method foundation for future study and build a new field for both porous metal parts and SLM technology.
Study on the Method of Measuring the Inertia Moment of Multi-Cylinder Engine
Authors: Zhang Yong Xiang , Li Lin , Ke Wei
Published: July 2011

Inertia moment of engine is a quite important parameter for power measuring without load, instantaneous speed calculating and in cylinder pressure reconstruction. In order to get this important parameter, a new method named instantaneous speed fluctuation comparison is brought out. The detail theory and approach is introduced. After experiment on the 6135 diesel, the validity of the method is proved, and the error of the method is analyzed.
FTA-Based Human Unsafe Behavior Control in Coal Mine Intrinsic Safety Management
Authors: Sheng Tian Bao , Zhang Yan Liang , Wei Qing Yun
Published: July 2011

The demand for coal keeps on increasing with the development of economy. However the short period of mine construction is apt to formulate safety hazard, the quality is easily neglected in construction process. Based on intrinsic safety management in ZhaoGu coal mine, workers’ unsafe behavior is analyzed from two aspects, i.e. construction workers and management, utilizing the fault tree analysis. Then some measures to guarantee security management are proposed, such as: (1) safety control on behavior and psychology. (2) strengthening on skills education. (3) optimizing organization management. (4) respecting workers’ psychological and physical cycle and enhancing their safety consciousness.
Fisher Discriminant Analysis Model of Drilling Downhole Accidents and its Application
Authors: Liu Jing Cheng , Wang Hong Tu , Li Wen Hua , Xu Chun Bi
Published: July 2011

Based on Fisher discriminant theory, the Fisher discriminant analysis model (FDA) was established for predicting the possibility of drilling downhole accidents. Six factors such as WOB、pump pressure、pump flow、running speed、ROPand torque were selected as the discriminant factors of the FDA mode. A series of data from drilling downhole accidents were taken as the training samples, and then some practical engineering datas were used to verify this mode. It was showed that FDA model is one of simple and accurate method in solving the prediction of drilling downhole accidents.
Study on the Forming Process Simulation of Alien Wheel
Authors: Tong Ying
Published: July 2011

The multifactor coupling simulation analysis of alien wheel forming process was performed. As for preforming and final-forming process the metal flowing, the temperature field of dies and billet were analyzed. The temperature varying and heat loss were forecast. Based on archard wear model the single-step wear depth in multifactor coupling conditions was evaluated, which helped to evaluating die life. The process scheme according to simulation results got good test verifying.
Multiscale Coupling of Meshless Particle Method and Molecular Dynamics and its Applications at the Nanoscale
Authors: Tian Jian Hui
Published: July 2011

A multiscale particle method with the intermediate oscillator is studied further in this paper. Whole domain is divided into atom domain and continuum domain and different method is used in each domain. The overlapping domain is connected by the intermediate oscillator and the energy of this domain is taken to be a linear combination of the continuum and atom Hamiltonians including the energy of the intermediate oscillator. Smoothed energy transfer is observed during this method applied. cases in 1D model are investigated and agreement result is obtained.
Financial Evaluation of the Listed Electric Power Enterprises in China Based on Entropy TOPSIS
Authors: Zhang Jin Hui , Wang Zhi Wen , Yuan Di
Published: July 2011

In this paper the entropy right-TOPSIS method is used, using entropy method to set weight is more effective than the use of subjective weighting method. The use of TOPSIS to determine evaluation scores can avoid the distribution of the number of samples and data limitations, reveals a different financial performance of listed companies the difference. From the evaluation results can be seen, N8, N5, N6, N7, N2 companies are the top five among the 12 listed companies. Their financial situation is better than other listed power companies.
Simulation Study on Forming Process of the Inner Panel of Automobile Front Fender
Authors: Tong Ying
Published: July 2011

According to the shape character of some one automobile inner panel of front fender the forming steps characterized by some process combined was brought forward. Based on FEM software the drawing process was simulated by a blank-holder force scheme 100000N, 200000N, 300000N. As the simulation results, in order to eliminate the fractures in diagonal reinforcements, it is infeasible only to decrease blank-holder force, but enlarging the die round corner is necessary. As fractures have been eliminated, in order to eliminate wrinkles, the blank-holder force needs to be increased. Otherwise the wrinkle region can be confined into useless area which needs to be cut off. Finally none forming defects occur as blank-holder force 300000N and die round corner 5mm.
A Numerical Simulation of the Working Process of Diesel Engine
Authors: Wang Qian , Wang Jing , Ji Heng Song , Gu Chen
Published: July 2011

Based on the in-cylinder hydrokinetics and by coupling the multidimensional model of in-cylinder combustion and verifying the rationality of the computational model, this thesis uses KIVA-3V program, which has been added a new subprogram, to provide a numerical simulation of the in-cylinder pressure, the temperature and the NOXdistribution and emission of a diesel engine in different injection advance angles, so as to analyze the change of in-cylinder pressure and temperature, and to find out the rules of temperature distribution, the NOXdistribution and emission condition. This thesis is of guiding significance to the better understanding of the performance of diesel engines and to the optimum design and research of the diesels.
Analysis on Evolution of Landscape Pattern in Dianchi Basin Based on RS and GIS
Authors: Han Zhao Qin , Ye Jing , Wang Zhen , Liu Jie , Yu Shu Xia
Published: July 2011

With the support of RS, GIS and FRAGSTATS techniques, the landscape pattern has been analyzed quantitatively in Dianchi basin by 16 commonly used landscape metrics, based on remote sensing images of 1988, 1990, 1994, 1999, 2002 and 2008. After performance of principal component analysis (PCA) on the 16 landscape metrics, three principal components (PCs) were generalized: spatial aggregation of landscape patches, landscape fragmentation and landscape diversity. Then, the characteristics and evolution of landscape pattern in Dianchi basin have been explored at the landscape level. The results showed, that, from 1988 to 1994, the landscape fragmentation was serious and the level of diversity was fluctuant. And for some kinds of landscape patches, the integrity was much undermined, the spatial distribution was scattered and the degree of aggregation was fallen. From 1994 to 2008, the degree of aggregation between patches increased gradually. The situation of landscape fragmentation was under control. And, the land use types had a tendency towards diversification and homogenization.
Index Properties of Organic and Slightly Organic Soils
Authors: Safari Aboulfazl , Ahmad Fauziah
Published: July 2011

Conflicting results in the effect of OC on Atterberg limits need to a clarification with more studies. The observation that why PL increases in the higher rate than LL would be interesting issue to more investigation. Thus, this paper is focused on the index properties of OS (Site A) and SOS (Site B). It was found that removing OC in Site A affect particle size distribution by a dispersion phenomena while no effect was observed in Site B. Presence of average 13.6 % OC in site A leaded to increase in liquid and plastic limits for 6.1% and 26.9 %, respectively.
Design of S-Shaped Submerged Inlet
Authors: He Guang Lin , Li Xiao Lin
Published: July 2011

The influence of centerline and the cross-section variation to aerodynamic performance of the inlet was researched in a wider range. A new method of measuring the total pressure recovery coefficient and total pressure distortion coefficient of the inlet was proposed. Based on the loitering aircraft, a s-shaped inlet was designed to meet the needs of stable flight of loitering aircraft, whose total pressure recovery coefficient is 93.2% and total pressure distortion coefficient is 1.2%.
Simulation Study on Crash Performance of Vehicle’s Front Longitudinal Rails Based on Material Strain Rate
Authors: Shi Pei Cheng , Gao Lin Xin , Xiao Ping
Published: July 2011

In this paper, the effect of material strain rate on the deforming process, the absorbing energy performance and the vehicle front longitudinal rails’ crash stress was researched.Furthermore, finite element model of a vehicle’s facial crash simulation was built up. Rigid wall facial crash simulation was carried out in two work conditions of considering front longitudinal rail strain rate and without considering it. Entire vehicle’s crash deceleraten was compared with test results. The results indicate that material strain rate has great effect on entire vehicle crash deceleraten, and the simulation result with considering material strain rate is more similar to test result than the one without considering it.