bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Effect Factors and Control Process of Match between Cladding Powder and Laser Beam in Coaxial Powder Feeding Laser Cladding
Authors: Chen L. , Liu X.M. , Huang F.X. , Chen J.
Published: June 2012

In laser cladding, match between the cladding powder beam and the laser beam is an important factors which directly affects the quality of cladding layer. It was conclused that the match principle between the cladding powder beam and the laser beam is that entire cladding powders are heating in effective diameter of laser beam and fall into effective region of laser beam on the substrate surface and combining with the actual match state of cladding powder beam and laser beam.
Analysis on Lubricating and Viscosity-Temperature Characteristics of the Vegetable Oil
Authors: Zheng Fa Zheng , Zhou Shan Dan , Xie Feng , Li Xin Nian , Yu Yu Meng
Published: June 2012

The reduction of oil reserves will cause the exhaustion of mineral oil. Therefore, the development of new lubricants that can replace oil-based lubricants has become the trend of the lubricant. The vegetable lubricant is excellently biodegradable, non-toxic, and renewable, meanwhile, it will not be impacted by the crisis of oil resources, and the development of new lubricants will surely become the important way to replace the mineral oil-based lubricants. The article Analysis the lubricating and viscosity-temperature characteristics of 15 lubricants, and a comparison with those properties of the mineral oil-based lubricants are performed.
Application of Micro-Suspended System in Bleaching Process of Natural Pigmented Animal Fiber
Authors: Ren Yan , Xu Cheng Shu , Xing Jian Wei
Published: June 2012

This paper introduces the application for micro-suspended system in the bleaching process of natural pigmented animal fiber, and compares the whiteness, strength, alkali solubility and subsequent dyeing property of the pigmented fiber after being bleached by traditional process and micro-suspended bleaching process respectively. The results of this study have suggested that adding micro-suspended chemical addictive in the bleaching process of natural pigmented animal fiber is able to protect fiber from damage, develop the fiber whiteness, improve the quality of the textile of this kind, and further enhance the fiber’s both subsequent spinnability and wear behavior.
Characterization and Performance Test of Copper Oxide Supported on Activated Carbon and Attapulgite for Flue Gas Desulfurization
Authors: Yang Yong , Qian Yun Hua , Xu Chen Hong , Jiang Jin Long , Chen Xiao Fang
Published: June 2012

Sorbent of CuO loaded on the support of powder activated carbon and attapulgite for flue gas desulfurization was prepared by impregnation method and characterized by BET, SEM and XRD. The results of BET and SEM showed that the sorbent had a high structural porosity, while sorbent with 20 % CuO loading had the best desulfurization performance although CuO was dispersed at the surface of carrier in a way of multilayer according to XRD patterns.
Experimental Analysis on the Environment of Internal Plasma Spraying Techniques
Authors: Liu Ming , Wang Hai Jun , Jiang Yi , Guo Yong Ming , Zhao Ke Ke
Published: June 2012

The effects of internal spraying environment on the microstructures and mechanical properties of plasma spraying NiCrBSi+15%Mo coatings were investigated. For experimental analysis of spraying environment, a specialized internal plasma device and its test unit were developed. Firstly, microstructures of spraying coatings and powders were analyzed by scanning electron microscopy (SEM). Furthermore, the boding strength, porosity and micro-hardness of the coatings were investigated and determined separately. According to these properties of plasma spraying coating, the influence of spraying environment on the coating properties and specimen temperature could be investigated. The results show that that the coating performances decreased because of the dust, smog and high temperature of the internal spraying environment. The high-performance internal coatings can be obtained by properly designing spraying process and using the special spraying device.
Research for Wearability Test and Comprehensive Evaluation of Knitted Fabric Made of Jutecell Fiber
Authors: Meng Jia Guang , Li Jing Jing , Li Ning
Published: June 2012

The article briefly introduced the wearing characteristics and the test methods of jutecell fiber knitted fabrics of 7 kinds different structures, like comfortableness, fastness and other properties, and used the fuzzy mathematics comprehensive evaluation method to analyze and estimate the wearing characteristics of jutecell fiber knitted fabric. Finally reach a kind of knitted structure with the optimum wearing characteristic.
Design of Three-Wheel Mobile Robot Control System
Authors: Xu Ying , Wang Liang , Duan Jin Tan , Peng Ying Long
Published: June 2012

The structure and working principle of motion control system for a three-wheel mobile robot was designed in this paper, it make use of hierarchical control method. AT89S52 was selected as core - controller of bottom control system, completing the structural design of the robot, system's hardware and software design. Through experimental tests, the robot motion control meet the intended requirements.
General Technologies of Music Playing Robots
Authors: Wang Ting Jun
Published: June 2012

Main common technologies of music playing robots are presented based on a xylophone playing robot design and implementation. The research on the common technologies for music playing robots discussed overall arrangement, mechanism structure, transmission mode, control system, music program environmental sensing, behavior, behavior and strategy. Some factors of effecting on music playing robots are discussed. A xylophone-playing robot is analysed and its common technologies are introduced. The xylophone-playing robot realized unmanned playing music via the expectant music control program.
The Research and Development of an Automotive Fault Real-Time Alarming System
Authors: Wang Zhao Hai , Huang Bing Hua
Published: June 2012

The authors have researched on the communication protocols and the diagnostic modes used by the second generation of On-Board-Diagnosis (OBD-II) system and put forward a project scheme of automotive fault real-time alarming system based on OBD-II system. The Total Control Unit (TCU) of the alarming system, the signal conversion module between TCU and OBD-II system, the preliminary expert system of automotive fault diagnosis, LCD display system and phonic broadcast system have been developed. Test results on sample machines prove that the alarming system can successfully acquires data stream & trouble codes from automotive electronic control unit, so the expert system can comprehensively analyze potential fault causes and provide the driver with solutions. The fault causes and solutions can be displayed on LCD and converted into voice by text-to-speech module. The wide spread of the alarming system would effectively reduce the costs of vehicle operation and maintenance and greatly improve the vehicle road safety.
The Restraining of Machine Vibration Based on the Optimized Servo Control
Authors: Huang Min Gao
Published: June 2012

CNC machine controlled by closed-loop gains an increasing attention because of its accuracy, however the vibration occurs easily. The methods for the optimization of the servo control to eliminate CNC machine vibration are proposed in this essay.
On-Line Monitoring and Fault Diagnosis System of Fan Based on LABVIEW
Authors: Tang Qing Bo , He Xue Wen , Zhu Wen Hu
Published: June 2012

This paper introduces an on-line monitoring and fault diagnosis system of Fan based on LABVIEW and Advantech PCI-1711 data acquisition card. Through the FFT spectrum analysis of domain vibration, four conditions corresponding to imbalance, misalignment, friction and oil whirl are tested. The result shows that the system can identify these common faults correctly. The system has the advantages of reliable stability, high accuracy and easy manipulation.
Mathematical Modeling and Simulation of Spherical Switched Reluctance Motor with Magnetic Levitation
Authors: Zhang Fan , Zeng Li , Yang Ye Juan
Published: June 2012

This paper presents a spherical switched reluctance motor with magnetic levitation on the basis of suspension theory and minimum reluctance principle. The elements and mechanism of the spherical switched reluctance motor with magnetic levitation, deduces and calculates the magnetic conduction of the gap by means of the magnetic segmentation are analyzed, and a mathematical model of spherical motor is obtained. With the Matalab/simunik simulation, the results show that the rotor realizes quick stable suspension and rotation, and has excellent antijamming performance as well.
Investigation of Control Strategy for Hydraulic Auxiliary Braking of Tracked Vehicle Based on Pump Efficiency Analysis
Authors: Teng Fei , Lv Jian Gang , Sun Yao , Guo Shao Yan
Published: June 2012

On the basis of hydrostatic and hydraulic auxiliary braking system for tracked vehicle, the hydraulic pump efficiency was analyzed and discussed. And the model according to the performance analysis was set up, and the optimal working line in which the hydraulic pump working at the highest efficiency level was obtained. And an energy regenerative braking control strategy was proposed which can lead to the optimal matching of hydraulic coupler, hydraulic pump/motor. The computing results show that the hydraulic pump/motor can achieve efficient operation, and the energy regeneration efficiency of braking was improved obviously with the regenerative braking control strategy under the safe braking condition.
Starting Control with Constant Engine Speed for AMT Automotive Based on Neural Network
Authors: Sun Dong Ye , Zhang Xue Feng , Wu Qing Lin , Zhang Lei
Published: June 2012

Starting control with constant engine speed of AMT automotive is a clutch control means based on the target accelerator pedal opening. According to the different accelerator pedal opening, the clutch engagement speed will be different. The neural network is used to estimate the target accelerator pedal opening by the start of the initial accelerator pedal opening variation. Thus completing the engine target speed and clutch engagement speed is to make sure the AMT start fast and smoothly. The results showed that: through estimating the target accelerator pedal opening, this control strategy can shorten the starting time and improved control quality significantly.
The Study of Dynamic Stiffness for IC Chip Die with Parallel Mechanism
Authors: Peng Wei Dong , Wu Zhi Wei
Published: June 2012

Abstract. The vibrating equation and the moving stiffness model are created for the Parallel Bonding Mechanism of the IC Chip Die designed. Its moving stiffness characteristic curves in whole working space are obtained though Matlab software and analyzed in this paper. Based on these characteristic curves, it proves that the moving stiffness of the Parallel Bonding Mechanism designed meets the working requirements of IC Chip Die.
Warpage Measurement of a Micro Electrical Fan on Micro-Injection Molding
Authors: Lee Jeou Long , Lin Y. , Shen Y.K.
Published: June 2012

This study characterizes warpage of a micro-injection molded micro electrical fan using the Michelson interference method. This study conducts experiments to analyze different polymers-polypropylene (PP), polyamide (PA), acrylonitrile-butadiene styrene (ABS), ABS+ polycarbonate (PC), and polyoxymethylene (POM)-process parameters, such as mold temperature, injection temperature, injection pressure, injection time, packing time, and packing pressure, for a micro electrical fan. To obtain the optimum result (minimum warpage), this study assesses the effect (warpage) of each material on micro-injection molding. PA plastic is the very suitable material for micro electrical fan with Michelson interference analysis on micro-injection molding.
Dynamic Study of Valve Train for Rotary Piston Engine
Authors: Zhang Lei , Pan Cun Yun , Wang Xiao Chong , Deng Hao , Chen Hu
Published: June 2012

Rotary Piston Engine is a new kind of rotary engine. To analyze the dynamic character of the valve system, kinematics equations are established using dynamical method. Dynamic response of the valve is studied by calculating the outcome using numerical method.FFT analysis is applied here to analyze the response curve. The result shows that the Valve Train covers the basic need, but the dynamic performance of the system still could be improved.
Aeroacoustic Study on a Simplified Nose Landing Gear
Authors: Long Shuang Li , Nie Hong , Xu Xin
Published: June 2012

Simulation analysis and experiment research are performed on the aeroacoustic noise of a landing gear component in this paper. Detached Eddy Simulation (DES) is used to produce the flow field of the model. The Ffowcs-Williams/Hawkings (FW-H) equation is used to calculate the acoustic field. The sound field radiated from the model is measured in the acoustic wind tunnel. A comparison shows that the simulation results agree well with the experiment results under the acoustic far field condition. The results show that the noise radiated from the model is broadband noise. The directivity of the noise source is like a type of dipole. The wheel is the largest contributor and the strut is the least contributor to the landing gear noise. The results can provide some reference for low noise landing gear design.
Effects of Cooling Air on Performance of Turbine Blade Based on CHT Simulation
Authors: Li Jing , Liu Zhen Xia , Ren Zhong
Published: June 2012

A numerical model for conjugate heat transfer (CHT) simulation is established for a turbine blade with air cooling, and 3D heat transfer simulation is accomplished. Effects of different amount of cooling air on the surface temperature distribution, work, efficiency of turbine blade is studied. The results show that the surface temperature drops quickly with the increase of cooling air at beginning and then become mild, the blade work goes up, the efficiency goes down.
Elastic and Plastic Analysis of Drive Wheel’s Hertz Contact
Authors: Zhao Jun Jie , Tian Hong Qi , Ren Yue Qing , Lu Zhai Jun
Published: June 2012

Conventional drive wheel strength check is based on Hertz line contact theory to do the calculation, for security reasons, the design is more conservative,so that there is a certain margin in carrying capacity of the wheel. To address the above issues, this paper analyzes the wheel contact problem for a precise non-linear contact by the finite element method. By comparison of two methods, it verifies that using the finite element is reasonable to deal with these issues, while it provides a reference for the rational design of full load capacity wheels as well.
Finite Element Analysis of Cylinder Involute Tooth Gear Based on ANSYS
Authors: Ye You Dong , Zhou Zhe Bo
Published: June 2012

In this paper, a cylinder involute gear model is established in AUTOCAD2007 software. SAT file format is imported in the ANSYS software and contact stress on gear meshing position is analyzed. The stress distribute drafts of the gear is obtained so that it is convenient to check the bending strength of the root of the gear and the fatigue contact strength of the face of the gear. The result is similar to the real situation. The whole process of model construction, analysis shows that ANSYS software is a reliable and effective tool which could provide theoretical basis to the gear teeth strength designation.
Finite Element Analysis of Treating Distal Femoral Fractures by LISS
Authors: Dong Li Min , Gu You Quan , Li Xian , Liu Nian , Chen Wei , Ye Jin Duo , Zhang Chun Qiu
Published: June 2012

Objective To set up a three-dimensional (3-D) finite element (FE) model of Less Inwasive Stabilization System (LISS) intreating distal femoral fractures(AO /33-A3), and make preliminary biomechanical analysis, which can provide a scientific basis for future clinical application. Methods To obtain information of the spatial structure of the femur by CT scan, then to build their three-dimensional solid model using of software, and use three-dimensional reverse engineering to obtain three-dimensional model of LISS. The model was assembled using the ABAQUS, then meshed and simulated axial compression force, the stress distribution of femur and LISS plate. Results The largest stress of the LISS focuses on the edge of the plate and the region which is close to the femur.
Aerodynamic Drag Reduction Design of Concept Sports Car
Authors: Zhang Ying Chao , Zhao Fang , Shao Shu Xin , Jin Guang Yin
Published: June 2012

Simulations analysis of the aerodynamic for a sports car modeling before and after optimization was introduced in the paper by using commercial CFD code--STAR-CCM+. In the first simulation, we got the drag coefficient, the pressure of convective and the turbulent kinetic energy spectrum，then we found the positions that may affect the drag coefficient. Further analysis inferred that our modifications accorded with the aerodynamic principles. These results can provide the basis for the modeling design and further optimization.
Identification and Modeling of Vibration Signals in Startup Stage of Electric Driven Reciprocating Pump
Authors: Lv Miao Rong , Li Mei , Shen Shi Gang , Wei Bao Jian
Published: June 2012

How to realize signal modeling and vibration signal characteristic extraction is a very significant topic. A large amount of drilling pump vibration signals were acquired from the indoor tests. The startup signals with time consistency were segmented from these measurement signals and analyzed in detail. There are mainly such five types of vibrations in the startup signals as the pump body’s vibration, whistle, shocks in moving parts, and impacts of the value lifted off or dropped on the seat, friction or grinding between moving parts. The pump body’s vibration and whistle have good time-frequency characteristics and change very regularity, which are defined as the startup vibration in this paper. The pump body’s vibration signals are modeled by OFMM method. After to exclude the OFMM modeling signal, the remaining signal was separated into different integrated components according to their vibration sources by PFM method, a HMM whistle vibration model based on PFM parameters was achieved. Furthermore, A combination of OFMM and HMM model is used to describe the pump startup vibration. Realistic simulation on the pump’s startup vibration has been achieved. Signal simulation was also carried out by use of this combination model. This approach is expected to become a powerful tool for drilling pump’s startup vibration signal analysis and modeling.
Investigation on Diesel Engine Volume Impact Factors Based on Design of Experiment
Authors: Tan Ze Fei , Chen Wen Gang , Li Da
Published: June 2012

In this paper, a parametric experiment model of V-8 diesel engine is developed. The parameters, such as the V-type angle, cylinder centre spacing, connecting rod length, flywheel width, body sinkage, cylinder head height, oil pan height and compression height are selected as research factors and their influences on the engine’s volume are studied by the orthogonal experiment. By each experiment, a new engine model is built by changing these factors’ values and the volume of the new model is calculated. Through analysis of variance, the significant relations between diesel engine volume and factors are given, which provide the criteria for the selection of the design parameters.
Kinematics Analysis and Simulation of the 4-DOF Tilter
Authors: Wang Hai Dong , Zhang Kai , Bi Yu Quan , Huang Kui , Yang Bing Heng
Published: June 2012

This paper proposed a type of new parallel tilter with four degrees-of-freedom, whose moving platform has three rotations and one translation. The coordinate transformation is adopted to establish the position and velocity kinematics equation of the tilter. Simulation result indicated that the moving platform can move according to the set law by modifying the displacement of the piston rod in active limb.
Large Eddy Simulation of Airflow Structural Characteristics in Real Human Mouth-Throat Model
Authors: Li Fu Sheng , Sun Dong , Xu Xin Xi , Liu Xiao Hui , Tan Shu Lin
Published: June 2012

Accurate simulation for airflow structural characteristics in the human mouth-throat model plays an important role in analyzing the filter effect of pharynx and larynx and the diffusion, transition and deposition patterns of aerosol in human upper respiratory tract. Large eddy simulation was used to simulate the airflow movement in human mouth-throat model in the conditions of the cyclic respiratory pattern, and the airflow structural characteristic in mouth-throat model was discussed. The results show that two velocity growth points generated in pharyngeal and laryngeal region; the airflow separates in region near the pharynx and the separation zone appears near the anterior wall of pharynx; A turbulence jet appears in the glottal region and the airflow; the high velocity zone is created in pharynx and larynx, and the phenomenon of airflow separation appeared in the pharynx. In the process of cyclic exhalation, the phenomenon of airflow separation didn’t appear in the pharynx and larynx.
Measurement and Calibration of the Displacement and Pressure in Automatic Wheelset Assembly Machine
Authors: Xiao Jun , Fang Rong , Cheng Xin , Han Jian Bin
Published: June 2012

This paper introduces the measurement systems of the oil cylinder in automatic wheelset assembly machine, theoretically analyzes the error of the displacement measurement system by curve fitting, and gets verification the error analysis in practice. This paper also calibrates pressure sensor from zero drift, slope of the output of the pressure sensor to guarantee the system pressure, and compensated pressure sensor value consistent.
Mechanical Analysis of Disc Cam Mechanisms with Negative Radius Roller Translating Follower
Authors: Lin Rong Fu , Chang Yong
Published: June 2012

This paper proposes the conditions of no-undercutting and contact-retaining of the disc cam mechanism with negative radius roller follower. Then, it presents the contact stress expression based on the mechanical analysis. In addition, the effects of different parameters on the force and contact stress are analysed. The results show that the contact stress can be reduced by designing the suitable parameters of the cam.
Numerical Analysis of Axisymmetric Nozzle Aerodynamic Characteristics
Authors: Wang Ping , Liu Xue Shan , Wang Yuan Da , Wang Xiao Kun
Published: June 2012

Abstract: Method of CFD is used to simulate flow fields for a certain Axisymmetric nozzle, The paper describes the grid adaption, boundary conditions determination as well as RNG model application, and analyzes the nozzle aerodynamic characteristics. The numerical results match well with test data.
Research and Application on a Multi Head Conjugate Disc Indexing Cam Mechanism
Authors: Gao Bing Tian
Published: June 2012

In order to realize the technical performance of high speed, high precision, high stability and high reliability for conjugated indexing mechanism with periodic intermittent rotary motion, a two cams structure has been designed, and its geometry size and profile curve was carefully determined. Also the calculation formula of the contour curve for CAM was deduced. Research achievement has been applied to new equipment of enterprise development, the working performance is stable and reliable, the production efficiency raised by 30% compared to the domestic industry. The mechanism has characteristics of simplified structure, improved transmission performance and low cost.
Research of Mechanical Sensibility on Vibrating-Beam Piezoelectricity Gyroscope
Authors: Liu Yu , Duan Yao Yu , Liu Shen , Ou Yi
Published: June 2012

According to sensibility and output accuracy is effected by mechanical coupling of positive and negative piezoelectricity films, analysis change of vibration beam nodes which result from coupling of positive and negative piezoelectricity films. In this paper, a new mosaic method of mechanical coupling is proposed which based on structure of the vibration beam gyroscope; the numerical calculations which result from carrying out for 60mm alloyed vibration beam illustrate the sensitivity of the Vibrating-beam Piezoelectricity Gyroscope improved 6.64%. Simulation results demonstrate sensitivity is increased 6.57% and in line with the theoretical calculations.
Research on Kinematic Performance Simulation of Double-Wishbone Independent Suspension Based on CATIA
Authors: Jin Jia Qi , Li Jiao Jiao
Published: June 2012

The vector and coordinate transformation method are applied to establish the constrain equations of the key points. Based on the existing data of suspension, applying the software CATIA, 3-D suspension model was established. The kinematic performance simulation of double-wishbone suspension model was calculated by setting the rational wheel-hop range. Based on the software MATLAB, the kinematics performance variation curves of the wheel alignment parameters were obtained, the variation laws were analyzed and the reasonableness of data were valuated.
Research on Structure Design Parameters’ Similarity for Loading Machine
Authors: An Xiao Ning
Published: June 2012

Calculation results are showing: There are basically specific relationships between loading machine’s weight and loading machines’ main parameters or other parameters’ combinations. So these specific relationships have certain similarity. And machine’s similarity criteria has invariance. The similarity equations derived from similarity theory basically coincide with quantitative analysis results from practical samples data. So, it is proved that there is a kind of similarity between loading machine’s practical design and development and similarity system’s design of structure size. So, the theory of simulation design is completely applied to practical design process.
Research on the Maximum Bending Stress on Driving Tine of SCMW
Authors: Chen Yang Zhi , Liang Shun Ke
Published: June 2012

In this study, equations of the maximum bending stress (MBS) on the root of driving tine of the space-curve meshing-wheel (SCMW) are deduced. Four factors have an impact on stress concentration of the driving tines, the helix angle, the fillet, the diameter of driving tines and the radius of the spiral curve for driving tine. They have been studied by Finite Element Method (FEM). Results show the former two factors have great impact on stress concentration while the last two could be ignored. Then the method to gain the stress concentration factor is proposed. It makes the theoretical result of the MBS on the root of driving tine match the actual result.
Research on Windage Power Loss of Spur Gear Base on CFD
Authors: Zhao Ning , Jia Qing Jian
Published: June 2012

The paper established three-dimensional Computational fluid dynamic (CFD) model of the oil-air mixture in the gearbox after meshing by ICEM CFD simulated the turbulence model by the CFD. The method of calculate the windage power loss (WPL) of the spur gear were put forward. In order to reduced the WPL, compared the results between the CFD model with different modulus、clearance of the shroud and radius of the modification of gear top. The modulus is major parameter to WPL; the gear with shroud have lower WPL , WPL of the tooth flank and clearance of the tooth flank shroud do not show the proportional relationship, the gear with smallest clearance of gear side have lowest WPL，the modification of gear top can reduce the eddy scale which can reduce the WPL.
An Experimental Study of V-Ring Position on the Die Roll Height in the Fine Blanking of Special Part with Corner Shapes
Authors: Kim Jong Deok , Heo Young Moo
Published: June 2012

In this paper, the relation between die roll height and V-ring position of a fine blanking tool was studied by experimenting on a special part with various corner shapes. Three guide plate inserts with different V-ring positions and a die insert with constant die chamfer were machined, and a fine blanking tool was manufactured for the fine blanking experiments. Three experiments were conducted on a 650-ton fine blanking press. Each die roll height was measured and analyzed. We found the tendency of the die roll heights on the corner shapes of fine blanked parts to increase with increasing the distance between the V-ring position and the contour of the special part, and to decrease with increasing corner radius and angle. These results can be used to minimize the die roll height of fine blanking parts with corner shapes when designing the V-ring of a fine blanking tool.
Structure Improvement and Mechanical Analysis on Data Transmission Antenna
Authors: Fan Wen Jie , Li Ning
Published: June 2012

Data transmission antenna plays an important role in transmitting data from satellite. The structure of antenna consists of four parts, including a feed tube, a reflecting surface, a brace and a adapter. Due to the unreasonable structure design and coarse mechanical analysis, the initial data transmission antenna was broken at the corner of a spiral in the process of random vibration test. In this paper an improvable method is brought up and mechanical analysis is carried out, the result shows that the first frequency raises from 324Hz to 328Hz and the stress root mean square decreases from 62MPa to 37MPa in X-direction random vibration. Of course, the improved antenna passes the random test.
Study of the Metal Flow Law on Cross Wedge Rolling Asymmetric Shaft
Authors: Peng Wen Fei , Jiao Si Jia , Shu Xue Dao , Zhang Kang Sheng
Published: June 2012

Finite element model of Cross wedge rolling asymmetric shaft is established, contrasting with symmetrical rolling, the axial relative displacement of weak-side and strong-side’s metal in asymmetric cross wedge rolling is analyzed. The results show that: axial relative displacement asymmetrical rolling on the weak-side undergo the process of “increase-decrease-unchangeableness” and axial non-uniform deformation increases; axial relative displacements on the strong-side undergo the process of “decrease- unchangeableness” and axial non-uniform deformation decreases. The results provide a theoretical basis for the cross wedge rolling asymmetric shaft parts.
Study on High-Speed Train Terminal Speed Based on Adhesion Utilization
Authors: Wang Hai Jun , Zeng Jing
Published: June 2012

The terminal speed of wheel/rail train is being concerned in the era of high-speed train. The number of terminal speed represents development level of wheel/rail train. In this study, the calculation formulas of basic resistance and calculation adhesion of the "Harmony" EMU were used. It was assumed that the traction power is enough large, and the terminal speed of high-speed train was obtained by calculating for dry rail surface and humid rail surface. The average terminal speed was calculated by the area-method. Randomly variational adhesion coefficient was simulated, and the necessary and sufficient conditions for the terminal speed were derived.
Study on the Damage Diagnosis of the Cantilevered Machine Tool Beam Based on BP Neural Network
Authors: Tong Gang , Ding Xiao Fei , Wu Da Wei
Published: June 2012

Structural damage intelligent diagnosis is the detection and evaluation of the structure, to make sure whether there is damage, and to figure out the position and the depth of the damage. The appearance of the damage affects the dynamic properties of the structure and leads to the reduction of the natural frequency and the change of the vibration mode. This paper mainly focuses on the damage diagnosis of the cantilevered machine tool beam, which includes parameterized modeling and modal analysis to get five natural frequencies and five vibration modes of different positions and different depths of the damage. The BP neural network is trained with the data base to realize the intelligent diagnosis.
The Influence of Cobalt Starting Sheet Stamping Molding
Authors: Li Shan , Xu Liang , Wang Yu Qi
Published: June 2012

Stamping process is a complex system, in the case of determined sheets, whether it can produce qualified parts has a great relationship with the setting of mold process parameters. Therefore, whether it is reasonable, the structure parameters of the parts are directly related to the forming quality of sheets. This paper uses the finite element numerical simulation, by setting different process parameters for single-factor simulation study, combines with the designers’ experience and repeats simulations to find the appropriate range of factors, and to obtain the optimum process parameters, thereby reducing repeated mold testing and repair costs, shorting the development time of new products.
The Influences of Complex Impact Conditions on Aircraft Fuselage Crashworthiness
Authors: Zou Tian Chun , Zhang Xiao Min , Mou Hao Lei , Feng Zhen Yu
Published: June 2012

In this paper, a certain B737 aircraft fuselage section was used to research the influence of different impact conditions on fuselage dynamic characteristics. A finite element model of fuselage was built up from FS380 to FS500. The impact responses of fuselage subjected to 9.133m/s vertical velocity were analyzed under the conditions of 0° roll angle, 10° left roll angle and combination acceleration. The differences of transformation and acceleration history curves under different conditions were compared. The research results show that the performances of 10° left roll angle will change fuselage transformation and acceleration of seats location, the appears of combination acceleration will increase transformation of floor and decrease acceleration at the seats location. The crashworthiness of aircraft structure can be effectively improved by selecting the appropriate landing way.
The Intelligent Analysis Method of Mine Equipment Lubrication and Wear Condition
Authors: Huang Wu Xin
Published: June 2012

Aimed at the actuality of the Mine-Concentrator, Dexing Copper-mine, the paper comprehensively apply such technology as the statistics analysis, the forecasting theory, the pattern recognition, the neutral networks and the expert system etc, to study the intelligent method of wear condition and lubrication condition. An improved BP algorithm was presented, based on this an automate wear condition recognition model and its system was designed. The example shows that this system can promote the accuracy of wear condition recognition and improve the generalization capability. After all the problems were solved properly, wear and lubrication condition of the equipment were guaranteed as well. Therefore, the monitored equipment was running very well that year.
The Microenvironment Simulation and Ergonomic Evaluation of Negative Pressure Isolation Cabin
Authors: Liu Sheng Jun , Hu Ming Xi , Zhang Yan Jun , Du Zhen Jie , Tian Feng , Xie Xin Wu , Gao Wan Yu
Published: June 2012

The paper simulates the airflow in the microenvironment of negative pressure isolation cabin for the infectious disease patients. The result shows that the proper setting of such parameters as air inlet, air outlet, fan flow rate, and differential pressure control can effectively discharge the contaminated air out of the tank after the air is efficiently filtered. During the cabin ergonomic evaluation experiment based on different negative pressure values, the temperature and humidity rise slightly compared with the external environment but there is no obvious accumulation. Besides, the human life indication is consistently kept in the normal range.
The Process Rebuilding of Tire Liner Product Line System
Authors: Liu Xiao Ling , Liu Jin Ping , Pang Zi Rui
Published: June 2012

According to characteristic process and control requirements of tire liner, the old process was rebuilded, combining with more precise and high efficiency control system, a new process method was designed. By practicality production, the system is stabilization, improving productivity and quality.
The Research of COMAS Vibrating Conveyor Noise Reduction
Authors: Li Shan , Xu Liang , Wang Yu Qi
Published: June 2012

In a cigarette silk production line of a cigarette factory, the noise of vibrating conveyor not only endangers the health of workers’ listening, but also reduces work efficiency. In this paper, the modal of the frame was analyzed with the ANSYS software. The analysis results show that the frame has torsion vibration and swing. These vibrations will bring adverse effects and noise. Through designing a vibration isolation system on the vibrating conveyor, the reasonableness and effectiveness of the isolation component were proved with static and dynamic analysis of the vibration isolation system with finite element method. At the same time, some rules what select the spring parameters were summed up. Through analyzing the isolation effect of the vibration isolation system in different parameters, these regularity conclusions will provide a basis for the noise reduction [1].
The Technology of Positional Detection in Automatic Wheelset Assembly Machine
Authors: Xiao Jun , Cheng Xin , Fang Rong , Han Jian Bin
Published: June 2012

This paper introduces a kind of position measurement and control systems in automatic wheelset assembly machine. This system adopts direct close-loop position control in the process of pressing and real time monitor position of wheel and axle with high accuracy. Compared with traditional wheelset assembly machine, it can improve production efficiency and ensure the quality of pressing through control the distance between backs of wheel flange and the position difference of two wheels accurately.
Torque Modelling and Experiment in Pelleting Process of Rotated Roll Forming
Authors: Wu Kai , Sun Yu , Peng Bin Bin
Published: June 2012

First the extruding force model of isotropic powder material passing through the die hole in pelleting process was founded, then the pressure distribution model in the extruding areas was built. Based on the two models, the torque model in pelleting process of rotated roll forming was developed. The experiments were carried out on the special designed pellet mill and the wireless torque testing system was used to analysis the torque datum. It is shown the computing datum is very close to the experimental results. The researches are helpful to the optimal structural design, energy consume reduction and proper use of the pellet mill in practice.
Analysis of Dry Dual Clutch Transmission Technology
Authors: Li You , Liu Pei
Published: June 2012

Dual clutch transmission (DCT) combines the advantages of AMT and AT. This paper selects a certain type of dry DCT as the study object. The structure and working principle are introduced. A shift dynamic model is established to analyse the five phases of shift process. The oil line diagram of the electro-hydraulic control system is provided, and then the characteristics of the proportional solenoid valves which are critical control components of DCT are studied. The analysis results provide theoretical basis and guidance for the design and development for DCT.
Vibration Analysis of Flexible Multi-Body Drill String System by FSI
Authors: Yu Gui Jie , Fu Lei , Xiao Wen Sheng , Yin You Cai
Published: June 2012

Combined with features of flexible multi-body drilling string system and top-drive drilling system, the characteristic equation for lateral, twisting and longitudinal coupled vibration of flexible multi-body drilling string system is developed based on elastic vibration theory and finite element method, and the lateral vibration constraints is restored. Within 1700m vertical borehole, the relationship between the intrinsic frequency of flexible multi-body drilling string system and axial load, static drilling pressure, mud, length of drill collars, length of drill pipes are gained by analyzing the lateral vibration, twisting vibration and longitudinal fluid-structure vibration of flexible multi-body drilling string system by using software ANSYS. One to five step intrinsic frequencies of flexible multi-body drilling string system are gained. The research is about the theoretical basis for Well bore control theory of top drive drilling.
Simulation and Experiment for the Ogive Affecting PELE Broken Finite-Thickness Reinforced Concrete Targets
Authors: Ye Xiao Jun , Du Zhong Hua , Chen Jun , Cao Ying Jun
Published: June 2012

In order to analyze the ogive effects PELE broken Finite-Thickness reinforced concrete (RC) targets, a variety of shape and materials ogive for PELE penetration 24 millimeters RC targets was analyzed using numerical simulation by LS-DYNA 3D finite element analysis software, the simulation results show that the PELE projectiles with a hollow cone shape and phenolic resin material ogive have better effect of broken RC. And the simulation model for the real experiment, the test results and simulation results agreed well, the simulation calculation model and parameters for PELE is credible, which can provide useful reference for design.
Strength Analysis of High Strength Steel Hydraulic Support
Authors: Cui Shuan Wei , Zhang Yi Liang
Published: June 2012

Based on the importance and complex working environment of hydraulic support, welding residual stress (WRS) measurement to main components were carried out respectively by X-ray diffraction and the measured data were further analyzed theoretically. Tests were made on the gob shield and base for two times, each was measured before and after heat treatment respectively. The results indicate that WRS in the base are higher than that in the gob shield before heat treatment. After heat treatment, residual stress (RS) level of gob shield and base decreased significantly, WRS in every region keep at a lower level and regional RS differences become smaller. Therefore, heat treatment processes is an effective method to reduce RS of hydraulic support after welding. Through the test results we measured, got the real residual stress level of gob shield and base, which can provide the basis of experiment to search for an appropriate welding and heat treatment process.
Vibration Test of Titanium Alloy Pipes
Authors: Qiu Ming Xing , Shao Chuang , Zhou Yong , Yue Li Hua
Published: June 2012

In order to determine the fatigue limits of two kinds of titanium alloy pipes connected by welding and rolling, fatigue tests were carried out by the Aero-Criterion which gives vibration fatigue test method and failure criteria. A laser-displacement-sensor was used at the free end and a strain-gauge at the root of the pipe specimen. The test result shows that the fatigue limit of the welded pipe is higher than the rolled one. In the end some new findings are listed according to the test.
Design of Ellipsoid Aluminum Plate System for a Certain Missile
Authors: Zhang Zi Bin , Li Heng Yan
Published: June 2012

The large ellipsoidal aluminium plate system for missile in lab simulation[2], reaching a length of nearly 100 meters, is an important component of the laboratory. How to make it well-designed to avoid repetition and reduce the loss is the key to the project. This paper proposes the calculation methods andmodels for the geometrical parameters such as longitude and latitude line length, radius of curvature , keel curve direction on ellipsoid and deflecting ellipsoid. The practical problem is resolved successfully by designing the calculation models.
Application of Piezoelectricity Acceleration Sensor to Dynamic Characteristics Monitoring of Tied Arch Bridge
Authors: Li Yi , Guo Zhong , Wei Hua
Published: June 2012

In bridge structural health monitoring, random vibration test and monitoring bridge dynamic characteristics provides an effective method for evaluation of bridge safety and serviceability performance. Piezoelectric accelerometer overcome the draw backs of the traditional sensor characteristic measuring instrument which are functional singleness and monopoly used, a piezoelectricity acceleration sensor performance analysis and dynamic characteristics monitoring system base on a tied arch bridge health monitoring system was designed, and the hardware structure and software of the system were introduced, acquired vibration signal can be displayed, stored, analyzed and processed in real time. The vibration frequency of the bridge structure, mode shapes and damping ratio is calculated base on the monitoring data, and the amplitude of frequency domain shows that the system was validated in actual real-time monitoring of bridge dynamic characteristics.
The Character Research of Oil Source with Load of Rolling Screw System
Authors: Chen Chun Ming , Liu Jia , Xu Li
Published: June 2012

Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. The control system is non-linear and real-time, each part of which is interactive, a simulation model of energy source system is built, which includes constant pressure pump, accumulator and pipeline and load by means of AMESim software. Based on the simulation and experiment, the relationship between the load frequency variation and the pressure fluctuation of oil-source are obtained, the research provides support on how to confirm the equipment parameter properly, improve the stability of energy source system and enhance the control precision by reasonable confirming the equipment parameter.
Vibration Simulation of Tracked Vehicle Suspension and Damper Consumption Analysis
Authors: Cai Zhao Zhong , Li Hui Mei , An Gang
Published: June 2012

In order to estimate the damping consumption of traditional suspension, this paper established the tracked vehicle model based on the dynamic simulation software RecurDyn, and the road models of B、D and F grad are constructed by harmony superposition method. Through the simulation of the suspension vibration, the relation between suspension consumption and different road surface and velocity is performed. The results supply some reference for the research on regenerative-energy suspension of tracked vehicle.
Bending Analysis and Measures of the Forming of Automobile Semi-Axle on Cross-Wedge Rolling with Multi-Wedge
Authors: Shu Xue Dao , Li Zhan , Zu Wang Ming
Published: June 2012

When forming automobile semi-axle using Multi-wedges Cross-Wedge Rolling (MCWR), it is difficult to avoid the rolling bending phenomenon. Thus to improve the product quality for finding out the causes and preventing rolling bending is essential. In this paper, the finite element model(FEM) analysis software Deform-3D was used to analize the bending causes, and giving the corresponding measures from numerical simulation of the forming of multi-wedge automobile semi-axle using Cross-Wedge Rolling. Based on the corresponding simulation experiments, the results indicate that the seasures is feasible. The results of this study for rolling forming of automobile semi-axle can improve product quality and provide a theoretical basis.
Simulative Research on the Influence of Vehicle Brake Deceleration on the Throw Distance Property of Human-Vehicle Accidents
Authors: Yuan Quan , Guo Rui , Li Yi Bing
Published: June 2012

Braking deceleration of passenger-car has great influence on the pedestrian motion process after collision of human-vehicle accident, but it is considered not enough in current accident reconstruction and vehicle-speed analysis. In order to improve the accuracy of accident reconstruction, a computer simulation model of pedestrian-vehicle accidents based on finite element (FE) method and human parameters of Chinese adult human body is established. In this article, based on the FE model, human-vehicle crash is simulated through involving the influence of braking deceleration of passenger-car. For the application of the vehicle-speed analysis, the motion performance of pedestrian after collision were studied and the correlation between the pedestrian throw distance and vehicle impact speed are investigated. The influence of braking deceleration in same impact speed is analyzed. Research results show that the vehicle brake deceleration has a certain influence on the throw distance of pedestrian and it should be taken into account on the accident reconstruction. We can conclude that pedestrian throw distance can be used to estimate the vehicle collision speed accurately when drivers take full braking measure during the crash.