bluuebunny/crossref_metadata_2025 huggingface dataset:
UGNX8.0 Multi-Axis Machining Technology in Impeller Design and Programming Simulation Processing Application
Authors: Chen Yan Yan , Ma Xiao Lu , Zhang Yong
Published: December 2012

The impeller as the key components of power generating machine, its processing technology has been an important subject in the manufacturing industry. The air flow meter uses in the integral impeller modeling, programming and processing research. Apply UGNX8.0 to the integral impeller for solid modeling and NC machining tool path simulation. In the terms of CNC machining for the characteristic and difficulty, put forward in this paper based on the UGNX8.0simulation of NC machining program and steps, successful interference free tool path, and according to the simulation results, generate four axis NC machining procedure of NC.
Measurement of Blood Pressure and Heart Beat Based on Sensors and Microcontrollers
Authors: Morsi Iman , Gawad Yahia Zakria Abd El
Published: December 2012

As heart related diseases are increasing over days, a mandatory need for an accurate, affordable heart rate and blood pressure measurement is essentially required now a day. This paper illustrates the simulation of two devices used to measure the heart rate and the blood pressure. The two proposed designs are built using different type of sensors and the generated results are compared to those of the (HEM-907XL) device from OMRON company. The first proposed design is constructed using either infrared (IR) sensor or light dependent resistance (LDR) to measure the heart rate. On the other hand, the second design is constructed using either a group of strain gauge sensors, or a group of piezoelectric sensors to measure the blood pressure. One hundred human subjects of different ages between 25 and 70 years old are used to test both designs. The two designs are implemented using microcontroller (ATMEGA 16); for it is lower cost and high efficiency. A comprehensive study is conducted on the results using statistical analysis to verify the validity of both designs.
The Design about Aiming at Amount of Change from Baseline Detector with Characteristics of High-Resolution
Authors: Wang Jin Song , Zhao Yu Chen , An Zhi Yong
Published: December 2012

In order to measure to the aiming at amount of changes from baseline, we designed a detector with characteristics of high-resolution. The apparatus takes with the combination of flat glass-based compensation method and reading such sine mechanism on the zero subdivision institutions, to achieve the angle measurement in way of high-resolution and outside reading. By using 0.2″theodolite as the basic instrument for verification of measurement, experimental results show that resolution of the instrument to achieve 2.16″, the measurement error less than 10.8″.
Numerical Simulation of Stress Wave Propagation Induced by Cut Blasting in Multi-Media
Authors: Yang Guo Liang , Yang Ren Shu , Huo Chuan , Che Yu Long
Published: December 2012

Explosive blasting in rock and other media could induce strong shock wave. Near blasting zone, the blasting energy mainly break rock. Slightly far away from borehole, the blasting energy induces plastic damage. Farther afield, this kind of energy presents elastic deformation. In cut blasting, multi-boreholes initiate at the same time, multi-column stress waves occur superimpose and converge. Especially in multi-media, this process is extremely complex. Adopt numerical simulation method, set up multi-media model, which include weathered rock, highly weathered rock and plain fill. This paper simulated the propagation process of stress wave in these medias. Revealed the propagation mechanics of stress wave.
Recognizing Check Magnetic Code Based on Peak-Valley Location and Amplitude
Authors: Fan Di , Chen Zhe , Bu Chang Cun , Yang Zhun Sheng , Li Jia
Published: December 2012

Magnetic code is widely used in check, securities, tax invoice, etc. However, the traditional recognizing and reading method of magnetic code is mostly based on correlation coefficient and it takes significant time and cost. After analyzing the characteristics of magnetic code signals in E-13B standard, this paper has proposed a new algorithm based on the peak-valley location and amplitude (PVLA) to simplify the calculation and system design. Firstly, the magnetic code signal is separated into magnetic ink character signals by the thresholds of peak and valley. Secondly, the features of the peak-valley location (PVL) and peak-valley amplitude(PVA) of each magnetic ink character signal are extracted and normalized, then the nearest neighbor recognition algorithm based on the vectors of peak-valley location and amplitude is utilized to recognize the magnetic code. The recognition results and statistical parameters from a large number of experiments show that the new method has higher recognition rate and better robustness. In addition, the new algorithm only involves additions and subtractions, so it has a lower computation cost.
Suppressing Chatter in a Plunge Grinding Process: Application of Variable Rotational Speed of Workpiece
Authors: Yan Yao , Xu Jian
Published: December 2012

This paper investigates the regenerative chatter in a plunge grinding process. The effect of the contact force on the onset of chatter vibration is clarified by a proposed continuation algorithm, and the boundary for the chatter-free region in which the grinding process is stable is obtained. By varying the rotational speed of the workpiece continuously, the chatter vibration with the values of the system parameters being near the boundary is suppressed, namely, the chatter-free region is expanded by this spindle speed variation control strategy.
Experimental Investigations on Characteristics and Welding Forces in Friction Stir Welding of AA 6061-T6 Aluminum Alloy
Authors: Wang Qing Xia , Yang Jian Guo , Ding Ling Long
Published: December 2012

Friction stir welding (FSW) technology requires a meticulous understanding of the process and consequent mechanical properties of the welds in order to be used in the production of high performance components. This paper deals with an experimental campaign aimed at the evaluation of the mechanical properties of AA6061-T6 friction stir welded joints. The joints are obtained by varying the welding parameters, namely, tool rotating speed and feed rate. The non-threaded tool is made of hot work die steel H13. The quality of the joints is evaluated in terms of both hardness and tensile strength. Moreover, for going a step further to study and control welding heat input in FSW process, a piezoelectric load cell is installed between the fixture table and the machine tool workbench in order to measure the welding forces in different directions.
The Application of Hasofer-Lind Method in Reliability Design of Thin-Walled Cylindrical Shell
Authors: Zheng Yu Long , Lu Zhi Min , Wang Lin Lin , Zhang Lin , Zhou Guang Liang
Published: December 2012

Hasofer-Lind method was applied to reliability design of cylindrical shell with internal pressure. The respective reliability design thickness of different diameter ratio was obtained in the case and compared with the thickness by the second moment reliability design method. The results showed that the wall thickness of cylindrical shell with internal pressure is the thinnest by using Hasofer-Lind method. And it is closest to the wall thickness of the second moment method in which the performance function was defined as the difference in actual wall thickness and the wall thickness needed for cylindrical shell with internal pressure.
Statistical Energy Analysis of Wind Noise in High-Speed Train Cab
Authors: Yang Xiao Yan , Xiao You Gang , Shi Yu
Published: December 2012

Statistical energy analysis(SEA) method has many advantages in analysis of high frequency, high modal density and complex dynamic systems. Dividing high-speed train cab into a series of sub-systems, the SEA model of high-speed train cab was established. The factors affecting the cab noise, such as modal density, damping loss factors, coupling loss factors, were gotten by theoretical analysis combined with experiments. Using large eddy simulation method, the fluctuation pressures from train head surface were calculated. Using fluctuation pressure as excitation source, wind noise spectra and power flow of sub-systems in cab were obtained, which provided the basis for the control of high-speed train cab noise.
A Method to Test Holding Force of an Electrode Tab-Clamp for Lithium-Ion Battery Formation
Authors: Ding Cai Hong , Liu Pei
Published: December 2012

With the increasing demand of the consistency on li-ion batteries, to be more stable and consistency for the holding force upon the battery’s charging by the electrode tab-clamps during the battery forming process becomes the basic requirements. This paper offers a new method to test the holding force of a spring clips by using a membrane-type force-sensitive resistive sensor as sensing element. According to the experiment and analysises, this paper also shows the linear fitting on the Pressure-Resistance Characteristic Curve of the sensor, which is close to the actual situation, and provides a basis for the follow-up data processing of the testing system. Multi-groups analysis of experimental data indicates that it is a simple and feasible method to test the holding force of the spring clips using in li-ion battery charging and discharging.
Research on the Sufficient Condition for the Existence of Periodic Solution of FGM Subjected to Aero-Thermal Load
Authors: Li Jing , Yin Xiao Na , Jin Xiao Dong
Published: December 2012

In this paper, the average equations are given through using the multi-scale approach method. By using the Melinkov function, the nonsingular linear transformation and the Poincaré map, the sufficient condition for existence of periodic solution of the nonlinear dynamical system about the FGM subjected to aero-thermal load is derived.
Residual Stress Prediction for High Speed Machining
Authors: Lin S.Y. , Cheng S.H.
Published: December 2012

This paper presents a residual stress prediction model for high-speed machining using the finite element method in conjunction with neural network. The finite element method is utilized to simulate a chip formation process, which is constituted step by step from the workpiece removal process under the conditions of high-speed machining. The residual stress distributions underneath the machined surface of the workpiece are determined subsequently. The artificial neural network is in turn applied to synthesize the data calculated from the finite element method and a prediction model for residual stress distributions within the machined subsurface of the workpiece is thus constructed. The model can predict the residual stress distributions at different locations beneath the machined surface of the workpiece for various workpiece materials under different combinations of cutting conditions such as cutting speed, feed rate, rake angle and edge radius of the tool more effectively.
Stress Analysis and Safety Prediction of Alloy Wheel Hub
Authors: Qian Wen Xue , Yin Xiao Wei , Xie Li Yang
Published: December 2012

A wheel hub is a key rotor component of automobile. Nowadays alloy wheel hubs are used more and more widely. They are typically lighter for the same strength and provide better heat conduction. As we know that do a FEA (finite element analysis) is necessary before and after the alloy wheel hubs have been made. In this paper, a detail analysis was done with FEM (finite element method), and the stress distribution of wheel hub we got was consistent with the real distribution. Also the FEA results show that the maximum stress is much less the yield stress and the working safety factor is less than the allowed safety factor and it is useful for further work such as fatigue life prediction and reliability assessment.
The Refined Equations of Special Orthotropic Piezoelectric Plate-II: Symmetrical Transverse Surface Loadings
Authors: Zhao Bao Sheng , Wu Di
Published: December 2012

The refined equations of special orthotropic piezoelectric plate are analyzed. Based on elastic theory, the refined equations of plane problem are derived by using Elliott-Lodge’s general solution and Lur’e method without ad hoc assumptions. The exact deformation field and exact stress field are represented by unknown functions with two independent variables. Based on boundary conditions, the refined equations for the generalized plane problem with symmetrical transverse surface loading are obtained.
A Coupled Fluid-Structure Simulation for Variable Displacement Pump Used in Vehicle
Authors: Wu Wei Wei , Li Jin Guo , Zheng He He , Wu Zhao Sheng
Published: December 2012

The defects of constant displacement pumps hinder the modern vehicle to achieve its energy saving goals. Variable displacement pump is becoming the focus of research and development. In the paper, the displacement adjusting mechanism in the pump is treated as a rigid, and its motion leads to a continuously deforming and moving fluid domain. ALE method is used in CFD to overcome the difficulties of the fluid-structure interaction exists in the variable displacement pump. The moving regularity of computing grid and the boundary conditions of the ALE method are reasonably specified, to minimize the computing complexity in the coupled analysis. Experiments on prototype prove the performance of the pump in flow rate and energy saving. The results of analysis agree well with the experimental data, and the motion of the displacement adjusting mechanism is analyzed accurately.
The Simulation Application for the Structure Design of the Etcher Nozzle
Authors: Sheng Lin
Published: December 2012

With the higher and higher etching rate, the flow field situation of the plasma etching chamber became an important factor to design the etcher chamber structure. This paper studied the etcher nozzle structure in detail by using the flow simulation technology to analyze how to get uniform follow field on the surface of the etching wafer, and then this paper determined the structure parameters of the etcher nozzle.
Steady-State Load Analysis of a Caterpillar Chassis by Finite Element Method
Authors: Qu Qing Wen , Yu Hong Juan , Wang Shao Qing , Sun Tian Ke , Che Jian Zhuang
Published: December 2012

In this paper, according to the characteristics of caterpillar vehicles, taking the PC200 excavator as a model, a caterpillar chassis model is established using analytical finite element method by the software Analysis. According to the characteristics of operating status, the load distribution of supporting wheels, at horizontal support, across the slopes at 10°, in the state of climbing 30° slopes, is analyzed. Effective support area of any three wheels is analyzed to obtain. The condition of focus circle and vehicle stability is determined. The maximum load of static stability is obtained according to the method of stability of three wheels. The results of calculation provide load support for the strength analysis of caterpillar chassis components and stability analysis, It also provides the supporting data for the structural optimization.
Numerical Analysis of Ice Accretion and Icing Effects on Airfoils
Authors: An Bo , Sang Wei Min
Published: December 2012

Aircraft icing cause significant degradation in aerodynamics performance and flight safety. Numerical methods are developed and presented to simulate two icing-related problems for airfoils, namely ice accretion and icing effects. Ice accretion on the leading edge of the NACA 0012 airfoil is predicted using CFD method based on spring analogy. A four-order Runge-Kutta method is used to solve the droplet trajectory equation. Besides, we use the integral form of Navier-Stokes equations and the Spalart-Allmaras turbulence model to study the icing effects. Designing three different icing models, the flow fields are analyzed. The results are in good agreement with the experimental data and show preliminarily that numerical method is feasible and effective.
Improved Design and Dynamic Simulation of High Aspect Ratio Folding Wings
Authors: Lv Sheng Li , Liu Ping , Yang Guang Jun , Tong Xiao Yan
Published: December 2012

Folding wings of UAV may lead to high bending and torsion deformation under flight load. In order to solve the problem, an improved folding wing mechanism is proposed, which makes support mechanism stiffness become enough big. By means of CATIA and ADAMS, a virtual prototype is set up, which can simulate dynamics of the deployment mechanism. Therefore the relationship among deployment time and friction coefficient and tension is arrived. Meanwhile finite element analysis is made on folding wing with support structure and without support structure by MSC.Nastran. And the results show that the stiffness and strength change obviously. Simulation results have a certain guiding significance for practical engineering application.
Manufacturing Information Model for Design for Manufacturing
Authors: Liu Hong Jun , Fan Qing Ming , Yan Tong Xiao
Published: December 2012

In the light of growing global competition, organizations around the world today are constantly under pressure to produce high-quality products at an economical price. The integration of design and manufacturing (DFM) activities into one common engineering effort has been recognized as a key strategy for survival and growth. In this paper, the importance of DFM and parts information model was introduced in today's manufacturing enterprise. It describes the classification of parts information model; namely: product models, process models and cost models, the main content and research status that the model contained. The author has proposed a semantic network description method of the manufacture parts information of and details its main content, which is the core of this paper.
Two Layer Fuzzy Generalized Maxwell-Slip Compensator in Direct Drive Servo Hydraulic System
Authors: Guansak Pitipongsa , Kogphimai Den , Po-Ngaen Watcharin
Published: December 2012

In industrial machinery units in which handle with high loads, hydraulic cylinders are often used to actuate the manipulators. The nonlinear effects of friction in the hydraulic cylinders can be a problem if they disturb the motion of the hydraulic servo system.Friction compensation is a prerequisite for accurate in a hydraulic servo system. This paper presents anintelligent nonlinear friction compensation framework,which the purpose is to develop a friction compensator strategy based on adaptive twolayer fuzzy controller. Thecompensator Generalized Maxwell-Slip fuzzy,combined with fuzzy controller, will be implemented to reduce the lackperformance resulting from friction. The electiveness of this approach is demonstrated by experiments on the direct drive servo hydraulic system.
Investigation for Convective Heat Transfer on Grinding Work-Piece Surface Subjected to a Mist/Air Impinging Jet
Authors: Zhang Jing Zhou , Tan Xiao Ming , Liu Bo , Zhu Xing Dan
Published: December 2012

Two objectives were outlined in the current study. The first objective aimed to assess the detailed flow and heat transfer features in the vicinity of a rotating grinding wheel with jet impingement directed at grinding zone by numerical investigation. The second objective aimed to assess the quantitative evaluation for heat transfer enhancement on a grinding work-piece surface subjected to the mist/air jet impingement by experimental investigation. The results show that the coupled action of swirl air entrainment and jet impingement is benefit somewhat for overall convective heat transfer in relative to stationary disk case whether the disk rotates in clockwise or contrary clockwise. When the jet impinging direction is consistent with the rotational direction of rotating disk, convective heat transfer enhancement is achieved near grinding region, especially at higher rotating speed. Furthermore, the increasing of water droplet in mist/air jet impingement showed significant enhancement of the cooling effect.
Effects of Centrifugal Pumps Outlet Angle on Flow Induced Vibration and Noise
Authors: Wang Yong , Wang Jian , Liu Dong Xi , Liu Hou Lin
Published: December 2012

In order to research the effects of impeller outlet angles on flow induced vibration and noise of centrifugal pumps, a single grade end suction centrifugal pump is employed as a research object. The outlet angles were varied from 33° to 29°and 37°, but the volute and the other geometric parameters keep constant. Based on the virtual instrument data acquisition system, pump product testing system and in the centrifugal pump closed experimental rig, the flow induced vibration and noise signals of model pump with different outlet angles in the full flow range are measured and analyzed. Experimental results show that the influence of flow induced vibration on volute is the largest. With the increase of impeller outlet angle, the variation tendency of vibration intensity for 4 measure points decrease. The vibration intensity of model pump gets the minimum value, when the outlet angle is 37°. Under different conditions, the shaft frequency peak of noise signal varied intricately with the increase of impeller outlet angle. When the outlet angle is 33°, the shaft frequency peak of the model pump is relatively small under each operating condition, and gets the minimum value at the design condition.
Preliminary Research of Manufacturing Technology for ITER Magnet Supports
Authors: Hou Bing Lin , Li Peng Yuan , Yang Shu Juan , Pan Chuan Jie
Published: December 2012

The International Thermal Experiment Reactor (ITER) is designed to operate for 20 years with high safety requirements. The magnets with their total weight being about 10,000t sit at the core of the ITER machine. In order to guarantee the safety of the ITER machine, the research of the manufacturing technology for ITER magnet supports (MS) is an indispensable working procedure before the MS are produced. The MS consist of toroidal field (TF) gravity supports (GS), poloidal field (PF) supports and correction coils (CC) supports. This paper summarizes that the preliminary research results for the manufacturing of the GS with thermal anchor, the reliable method to manufacture the U-shaped clamp with tapered slots for PF coil supports and the special devices for test of full-size fasteners used in all the MS.
Effects of Droplet Size on Transient Behavior of after Fogging Process
Authors: Kim Kyoung Hoon , Han Chul Ho , Jung Young Guan
Published: December 2012

Gas turbine cycles with after fogging where water is injected after compressor could offer enhanced efficiency compared to inlet fogging system due to higher water injection ratio. In this work the after fogging process is modeled based on the evaporation of droplets. Transient behaviors of the process are investigated with analytic expressions obtained by considering heat and mass transfer and thermodynamic relations. Effects of droplet size on the transient behaviors of important system variables are thoroughly investigated including diameter and mass of droplets, temperature and density of air, and mass flux and heat transfer from the droplets.
Analysis on Thermal-Fluid-Solid Interaction of Straight Pad Finger Seal Performance
Authors: Chang Cheng , Hua Su
Published: December 2012

Aimed at the structure and working condition analysis of the straight pad finger seal, an analysis model of the straight pad finger seal which contains three complete fingers is presented. And then the influence of heat effect to the seal structure body and fluid flow state is considered in the model. By using the thermal-fluid-solid interaction numerical calculation method, the working performance of the non-contacting finger seal and its change law with working condition is studied in the paper. The straight pad finger seal's leakage rate, gas film lift capacity and gas film flow field characteristics in different working conditions are analyzed. The results show that the gas film between finger foot and rotor has radial lift capacity, which can meet the requirement of reducing wear. And since the deformation of whole finger foot is relatively uniform, it is hard to have the appearance of circumferential warp. It is advantageous to adapt to the rotor radial runout and deflection. The performance of straight pad finger seal is influenced much more by the high-to low-pressure differential and the gas temperature of high pressure chamber. The work presented here provides helpful reference and theoretical basis to design the non-contacting finger seal with high performance.
Theoretical Analysis and Experiment of Super Hybrid Rice Seeds Embryo Oriented Based on Arc-Shaped Guided Plate
Authors: Yu Ya Xin , Zheng Bin , Yang Yuan Yuan
Published: December 2012

Planting requirement of Super Hybrid Rice is 2±1 seedlings per hill, so sowing seeds request seed quantity and position accuracy for super rice transplanting mechanization. Based on the physical characteristic of super rice seed’s surface that along its long axis the awns grow in all directions from glumes to the glumes tip, the rotation mechanism of rice seeds embryo to the same direction were researched. In consideration of the difference of rice seeds, the arc-shaped guided plate with high friction coefficient was proposed. Orthogonal method was used to analyze the influence of parameters on rice seeds arrangement and a set of parameters were got. Vibration seed metering device was fabricated, and its structure parameter could be adjusted conveniently. Experimental results showed that above 88% super rice seeds embryo were orienting ordered, and the seed metering device based on arc-shaped guided plate can be used in seeding pipeline.
Study of the Parameters of Deep Drawing Process Based on the Simulation of Dynaform
Authors: Qu Qing Wen , Sun Tian Ke , Wang Shao Qing , Yu Hong Juan , Li Fang
Published: December 2012

A simulation of deep drawing process on the sheet metal was done by using Dynaform, the influence of blank holder force, deep drawing speed and friction coefficient on the forming speed of sheet metal in the deep drawing process were got. The forming speed of sheet metal determines the quality of deep drawing, in the deep drawing process the blank holder force and the deep drawing speed are controllable parameters, the friction coefficient can be intervened and controlled, and it’s a manifestation of the interaction of all parameters, the main factors which influence the friction coefficient just have blank holder force, deep drawing speed and lubrication except the material. The conclusion of this study provides the basic data for the analysis of the lubrication of mould, the study of lubricant and the prediction of the service life of deep drawing die.
The Influence of Speed on the Performance of Centrifugal Pump
Authors: Zhang Hui Min , Li Guang Ji , Peng Dong Mei
Published: December 2012

Centrifugal pump is widely used in plants as well as in common life. In many conditions, the centrifugal pumps do not operate in their optimal points for various reasons. In order to increase the efficiency, it is often used that the centrifugal pump rotates in different speed. In this paper, the 3D software UG is used to establish the model of pump. The simulation software FLUENT is used to analysis the flow field and pressure in the impeller. The numerical simulation shows that when the speed changed the flow field is similar in the impeller. The performance get from numerical simulation is compared with standard curve.
Ontology Based Knowledge Processing in Condition Based Maintenance System
Authors: Jin Gui Yang , Lv Fu Zai , Xiang Zhan Qin
Published: December 2012

Many capital-intensive industries such as iron and steel, energy, refining, petrochemical and manufacturing companies have the pressure of continuous increase in maintenance costs. In recent years, condition based maintenance becomes an important tool for reducing maintenance costs in these industries. It is a very information intensive domain. Good condition based maintenance systems need to integrate multiple heterogeneous data sources. In this paper, we will use ontology to describe the semantics of condition based maintenance concepts. It serves two main purposes: (1) offering a common understanding of the condition based maintenance domain, and (2) the knowledge held in the ontology is machine-readable and explicit, thus making the knowledge easy to be processed and reused.
Development of 1×4 MEMS Multifunction Integrated Optical Device
Authors: Chen Qing Hua , Chen Ying Jun , Li Yan Mei , Wu Wen Gang
Published: December 2012

A 14 compound-driven MEMS-based optical device with optical switch and variable optical power attenuating functions has been proposed to optimally serve multifunctional optical fiber-based networking applications. The device manipulates the light with binary-slope mirrors driven by compound electrostatic actuator. The optical model for switching is investigated. Performances of the fabricated devices assembled with ball-lensed fibers are measured and discussed. Measurements reveal that the insertion loss of the device is less than 2.6 dB and the controllable attenuation range is more than 40 dB for the switching and attenuation function, respectively.
Numerical Study of Inverse Problems of Nonscattering Anisotropic Shell Theory
Authors: Alekseev Gennady V. , Lobanov Aleksey , Grenkin Gleb
Published: December 2012

The inverse problems are formulated for generalized Helmholtz equation describing propagation of acoustics waves in inhomogeneous anisotropic medium. These problems are connected with constructing nonscattering shells filled with anisotropic fluid. For solving the inverse problems we apply the nonlinear optimization techniques. Based on this approach we formulate the general control problem for the Helmholtz equation under consideration. The control problem consists of minimization of a suitable cost functional depending on the state (acoustic pressure) and unknown functions (controls). The optimality system for the general control problem is derived, the sufficient conditions for data which provide a local stability and uniqueness of control problems under study for concrete tracking-type cost functionals are discussed. The efficient numerical algorithm of solving control problem under study based on Newton's method of solving nonlinear equations and finite element for Helmholtz boundary value problems is proposed.
Application of Generalized Predictive Control to a Peristaltic Pump
Authors: Hu Guo Feng , Chen Le Geng
Published: December 2012

Peristaltic pump is widely used in medical practice and chemical industry. But in some applications, which ask for small flow and high precision, a small jump of output to the peristaltic pump is quite serious. Therefore, it restricts the use and performance of peristaltic pump. This paper tries to introduce generalized predictive control method to the system of peristaltic pump. Besides, the results of simulation and experiment show that the static error of system using the mentioned method is smaller than traditional PID control which asks for a continuous output, so as to the output error when the system works at the small titration.
The Research of the Stability of Rotation Super-Rice Seed Based on Single Axisymmetric Characteristics
Authors: Yu Ya Xin , Zheng Bin , Yang Yuan Yuan , Lin Jia Hui
Published: December 2012

Preliminary tests found that super-rice seeds could be oriented by rolling them down with a guided plate. The rotation of the seed around the shortest axis was found to be unstable, while rotation around another two axes was found to be stable. The purpose of the current study was to examine whether this orientation phenomenon could be explained in terms of inertial characteristics of seeds. According to the surface feature of the seeds, an ellipsoid geometrical model was made. Euler dynamical model were built to analysis the movement stability of the seeds. The effect of parameters on movement stability was analyzed by the method of numerical simulation.
Research on Stochastic Finite Element Reliability Analysis Method of the Structure for the Truck Crane Boom
Authors: Lu Feng Yi , Gao Jin Jin , Yang Rui Gang , Xu Ge Ning
Published: December 2012

The telescopic boom of truck crane has bearing and luffing functions. It not only requires higher carrying capacity, but also requires higher reliability in the various working conditions. For scientific evaluating the reliability of the telescopic boom structure, the stochastic finite element method is used to calculate the structure performance function probability. Taking 50t truck crane telescopic structure as an engineering practical example, the feasibility and practicability of the method have been verified (tested/proved).
Dynamic Characteristic Analysis and Experiment of Piezoelectric Vibration Table of Industrialized Precision Seeding Device
Authors: Chen Shu Fa , Hou Li Ya , Zhang Shi Ping
Published: December 2012

A piezoelectric vibration table was designed for seeding precisely small size of vegetable seed, tree seed, flower seed, etc., it worked under the converse piezoelectric effect of piezoelectric element, piezoelectric vibration driving system produced mechanical micro-displacements with applied electric field, micro-displacements amplified by amplification mechanism driven the seed dish vibrating, producing the boiling movement beneficial to sucking seeds. The mathematical model of piezoelectric vibration was established, static and dynamic state properties of vibration table were analyzed and tested. Experimental results showed that piezoelectric vibration system had a higher drive capacity when 90～110 V electric voltage was loaded, vibration amplitude was above 1.31 mm, vibration frequency was at 13～55Hz and adjustable (resonant frequency about at 25Hz). The piezoelectric vibration table is expected to reach to favorable dynamic characteristics and higher seeding performance, runs smoothly, and meets the agronomic demands for precise tray seeding.
Design and Research on Variable-Rate Fertilization Computer Control System
Authors: Chen Shu Fa , Feng Cheng Long , Zhang Shi Ping
Published: December 2012

Based on domestic and foreign research situations of variable-rate fertilizing technology, the overall structure and working mechanism of variable-rate fertilizing machine were described, control content and strategy of control system were studied, AT89C5 SCM was used as a core control element in control system, control system hardware and software were designed and integrated. Variable-rate fertilizing experiments in space and paddy field showed that working efficiency of the spreader was up to 6 hm2/h, fertilizing error was less than 5%, fertilizing stability variation coefficient was less than 6.2%, working performance and control system design of the fertilizer can satisfy the demand of variable-rate fertilization in paddy field.
Reliability Estimation of Fatigue Life for Machine Parts under Uniaxial Constant Amplitude Load
Authors: Li Yu He , Bai Xin Li , Zhang Ying Fang
Published: December 2012

Two methods acquiring p-S-N curve for machine parts are given, namely directly searching out the p-S-N curve of the material from material database and using the idealized p-S-N curve. Reliability estimation methods of fatigue life of machine parts are derived under uniaxial constant amplitude load. Two kinds of circumstances (fixed stress and probabilistic stress) and two kinds of stress cycles (reversed cycle and unsymmetric reversed cycle) are considered. An iteration method is presented and the corresponding computer program is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are closer to experimental results. The suggested method can be convenient to fatigue reliability design of machine parts. It has good stimulative effect on popularization and application of existing anti-fatigue design method for machine parts, and high value of engineering application.
Shape Optimization of High-Speed Train Pantograph Insulators for Low Aerodynamic Noise
Authors: Yang Xiao Yan , Xiao You Gang , Shi Yu
Published: December 2012

With large eddy simulation(LES) and Lighthill-Curle acoustic theory, the aerodynamic noises radiated from pantograph insulators with rectangular, circular, elliptical section were calculated, and the optimal pantograph insulator shape was obtained. The results show that in the same model, the sound pressure level (SPL) spectrum at different monitoring points are basically the same, but the amplitude is different. In different models, the SPL spectrum are different. As for rectangular, circular, elliptical section insulators, the frequency with maximum SPL reduces gradually. For reducing aerodynamic noise, the elliptical section insulator is optimal, and the long elliptical axis should be consistent with air flow. The pantograph with bigger and less components is helpful to reduce the aerodynamic noise.
Numerical Simulation and Experiment of Motion of Rice Seed in Pneumatic Seed-Metering Device
Authors: Yu Ya Xin , Yang Yuan Yuan , Zheng Bin , Zhang Fei
Published: December 2012

A new-style pneumatic precision seed-metering device for super rice seed was proposed. This paper analyzed the working process for seed-metering device. The movement of rice seed in the “L” tube was simulated by finite element analysis software. The speed distribution, pressure distribution of air in the “L” tube and the trajectory of rice seed were solved. Results of the analyses indicated that there were partial reflux at the entrance and elbow; while the airflow moved steadily at the straight pipe. Based on the fabricated device, the motion trajectory was studied by high speed video camera. Experiment was used to analyze the effect of parameters. The results showed that the experimental trajectory was in accordance with theoretical models.
Research on Vehicle Chassis Integrated Control Technology Based on Coordination Strategy
Authors: Wang Kui Yang , Yuan Chuan Yi , Tang Jin Hua , Li Guo Qing
Published: December 2012

In order to eliminate mutual negative effect of brake, steering and suspension system, a kind of layered coordinated control method based on multiple controllers is put forward. Framework of coordination control system of chassis is established, coordination strategy of upper controller and control strategy of lower controllers are designed. The upper controller is used mainly to receive operation information of driver, running state of vehicle and feedback information of lower controllers, and send coordination control strategy to lower controllers. The lower controllers include controller of electro mechanical braking system (EMB), controller of electric power steering system (EPS) and controller of active suspension system (ASS), which are used to receive decision instruction of upper controller, control actuators to accomplish control tasks and send execution situation to upper controller in time.
Vibra-Acoustic Characteristic Matching of Mini-Car Body Structure and Interior Acoustic Cavity in Low Frequency Range
Authors: Wang Qian , Yu Yang , Li Yuan Bao , Li Shou Kui , Zheng Wei Juan
Published: December 2012

This paper focused on the interior boom noise of a mini-car when driving at high speeds. Vehicle interior noise rotor drum tests in semi-anechoic room showed that vehicle interior boom noise in narrow frequency band exited near 250Hz. Structural and acoustic finite element analysis certified the front roof and rear floor coupled with interior acoustic cavity around this frequency, causing acoustic cavity resonance. On the base of sensitivity analysis technology, a structural improvement schemes pasting free damping fin on the front roof and rear floor of mini-car body for vibration and noise reduction was proposed. Finite element Modal analysis of the mini-car body after improving indicated that local modal amplitude of the mini-car body at the front roof and rear floor around 250Hz was controlled effectively. Mini-car rotating drum test results after improving showed that vehicle interior boom noise was decreased obviously after pasting free damping fin at the front roof and rear floor. The improving schemes and noise reduction effects proposed in this paper were validated.
Study on the Mechanical Characteristics of an Electrode Tab-Clamp for Lithium-Ion Battery Formation
Authors: Ding Cai Hong , Feng Na
Published: December 2012

In the formation process of lithium-ion battery, the clamping force of the electrode tab-clamp is a very important factor for lithium-ion battery charge-discharge performance. Different from the traditional spring type tab-clamp, this paper proposes a leaf-spring type tab-clamp, that could produce the deformation of leaf-spring by the micro-motion of an actuating cylinder to provide a controllable clamping force of the tab-clamp upon the electrodes of lithium-ion battery. It is verified that the leaf-spring type structure is available and feasible through finite element analysis (FEA). According to the data from FEA, the relational expression between the clamping force and the micro-motion of the actuating cylinder is drawn out, and an impact analysis about design parameters to the clamping force is accomplished and some useful results are got. The study of this paper is helpful to guide mechanical design of the electrode tab-clamp for lithium-ion battery charging and discharging and to improve its mechanical performance.
Heat Dissipation and Temperature Distribution of Brake Liner Using Steady State Analysis
Authors: Natarajan M.P. , Rajmohan B.
Published: December 2012

Brakes are machine elements that absorb kinetic energy in the process of slowing down or stopping a moving part. Brake capacity depends upon the unit pressure between the braking surfaces, the coefficient of friction, and the ability of the brake to dissipate heat equivalent to the energy being absorbed. In braking system, drum brake is used mostly for automotive application. During the braking process, the forces and pressures in a drum brake are difficult to determine because of the manner in which the shoe contacts the drum. Finite Element analysis has been used to predict interface temperatures and heat flows and the results have been compared with experimental measurements made using fine thermocouples. Good agreement has been achieved, showing that the proportion of heat which flows into the friction material varies with time and temperature.
Topology-Preserving Transformation Based on the Correspondence of Control Points Using Radial Basis Functions
Authors: Yang Xuan , Fan Shan Shan
Published: December 2012

For point-based image registration, transformations using radial basis functions on scattered points cause problems with topology-preservation. We propose here a topology-preserving transformation based on expansions of radial basis functions. By analyzing the non-preserving transformation given by the corresponding control points, this method computes the main shifting directions of topology non-preserving regions on deformed surfaces. It then determines the control points leading to the topology non-preservation results. Next, it adaptively relaxes these control points based on the spatial relationships of points, and adjusts the transformation function coefficients using relaxation parameters to construct the topology-preserving transformation. We provide here the method for selecting the control points that cause the topology non-preservation results and estimate the optimal relaxation parameters based on the shifting model of the control points. Experimental results on random point sets, artificial images and medical images show that this method is feasible and practicable.
Stability Analysis and Numerical Simulation of the Conical Tower of the Wind Turbine
Authors: Song Xi , Wu Yin Guang , Li Heng Zhou , Dai Jian Xin
Published: December 2012

In the light of the structural features of the wind turbine tower and force characteristics, the mechanical model of the variable cross-section tube tower is established. Based on the elastic stability theory, the buckling of tower is studied, and the critical force formula of the tower under the concerted action of concentrated force and gravity is deduced. Calculation models are numerically simulated for the stability of the tower by using the finite element software ANSYS, and corresponding critical load is obtained. The results show that the finite element models are feasible in engineering application, and the analysis provides a theoretical basis for structural design of wind turbine.
Convergence Study on Application of the Over-Deterministic Method for Determination of Near-Tip Fields in a Cracked Plate Loaded in Mixed-Mode
Authors: Šestáková Lucie , Veselý Václav
Published: December 2012

Multi-parameter description of crack behavior in quasi-brittle materials offers still enough space for investigations. Several studies have been carried out by the authors in this field [1-3]. One part of the publications by the authors (this work included) contain analyses of the accuracy, convergence and/or tuning of the over-deterministic method that enables determination of the coefficients of the higher-order terms in Williams expansion approximating the stress and displacement fields in a cracked body without any complicated FE formulations. These intermediate studies should bring together a list of recommendations how to use the ODM as effectively as possible and obtain reliable enough values of coefficients of the higher-order terms. Thus, the stress/displacement field can be determined precisely even in a larger distance from the crack tip, which is crucial for assessment of the fracture occurring in quasi-brittle materials.
The Practical Use and Method for Diagnosing Roller Axle Troubles on Site
Authors: Chen Shan Shan
Published: December 2012

On the basis of the principles for diagnosing roller axles and personal practice with the theory on site for years, the writer has summarized the method for diagnosing roller axles to “Three Frequency Bands”and “Eight Confirmations”. This diagnosis method is suitable particularly for urgent conditions without complete data of the equipment .It’s practical use has proven that the method is not only feasible, but simple , convenient and ease to grasp as well.
Simulation and Experiential Research for Broken Conductor Load of Suspension Towers of UHVDC Power Transmission
Authors: Zhang Zi Fu , Mo Zeng Lu , Geng Jing Du
Published: December 2012

The breakage of conductor/ground wire seriously affects the secure operation of transmission line. According to the features of UHVDC power transmission lines, the broken conductor model for bundled conductors of continuous span is built and the broken conductor load is calculated; A simulating test was carried out the first time in China for a series of "broken conductor" events on one continuous span on the field to study the dynamic response of the transmission tower because of impact, then the dynamic strain and displacement were obtained. On the basis of the simulation and experiential research results, the paper discussed about the rational values of broken wire loads for the suspension towers of UHVDC.
A Comparative Experimental Investigation of 3D Angle-Interlock Woven Composite between Quasi-Static Tension and Three-Point Bending Loading Conditions
Authors: Zhang Fa , Jin Li Min , Sun Bao Zhong
Published: December 2012

As one new kind of 3D textile structural composite which has a strong potential in the application field of structural engineering, the mechanical behavior of 3D angle-interlock woven composite (3DAWC) needs to be extensively investigated. In this paper, a comparative experimental analysis of 3DAWC between quasi-static tension and three-point bending loading conditions were described, which has not been well studied so far. To evaluate the mechanical properties of the 3DAWC, the stress-strain/deflection curves were obtained under quasi-static tension and three-point bending loading, respectively. Furthermore, the Young’s modulus and peak values in stress were also compared. All of these results show that the 3DAWC has good integral performance.