bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of V-Shape Linear Ultrasonic Motor Based on Hammerstein Model
Authors: Zhang Jian Tao , Zhang Tie Min , Kong De Bing
Published: October 2010

A two-variable nonlinear mathematical model of V-shape linear ultrasonic motor (LUSM) has been presented. The relations of LUSM speed characteristics and its control variables are nonlinear, which are serious problems for accurate speed control. This paper presents a mathematical model based on Hammerstein model, which is composed of a steady-state nonlinear part and a linear dynamics part. The steady-state nonlinear part is represented by a hyperbolic tangent function, and the linear dynamics part is represented by a first order transfer function. In order to identify the coefficients of the steady-state nonlinear function, Uniform Design was used to design experiment, the nlinfit and polyfit function of Matlab software was used to deal with the experiment results. The comparisons between the estimated speed with using the proposed mathematical model and actual speed in different conditions were conducted. Comparisons results indicate good performance of developed model with respect to the experimental data.
Flow Analysis of Spray Jet and Direct Jet Nozzle for Fire Water Monitor
Authors: Hu Guo Liang , Chen Wei Gang , Gao Zhi Gang
Published: October 2010

In order to investigate the influence rules between the jet nozzle of fire water monitor and the jet performances, two typical jet nozzle, the spray jet and direct jet nozzle was designed to analysis the jet flow characteristics. Flow simulation of the jet nozzle was completed using fluent kits. The outlet velocity of the spray jet nozzle and direct jet nozzle were investigated in detail, and the influence rules of the nozzle structure on the outlet velocity was also discussed. The simulation results show that the steady velocity of the jet nozzle is about 34m/s that coinciding the contour magnitude, and the better extended length of the direct jet nozzle is about 50mm length that can improve the jet performances. The results can verify the reasonableness of the designed nozzle, it also can optimize the nozzle structure and increase the jet performance of the fire water monitor.
Analysis of Cutting Forces in Helical Ball-End Milling Based on Coordinate Conversion
Authors: Wu Wei Guo , Wang Gui Cheng , Shen Chun Gen
Published: October 2010

In this work, the prediction and analysis of cutting forces in helical ball-end milling operations is presented. The cutting forces model for helical end-mills is based on the oblique cutting theory and the geometric relations of the ball-end milling process. The helical flutes are divided into small differential oblique cutting edge segments. According to the transformation relationship between the local and global coordinate system of the cutter, the differential cutting force of cutting element is obtained by two coordinate conversions from the orthogonal cutting force. The total cutting force of helical ball-end milling is the sum of the cutting force in whole cutting field of the miller. As a result, the predicted cutting forces show an agreement with the values from the cutting experiments.
Analytical Modeling of Residual Stresses in Burnishing
Authors: Zhao Jing , Xia Wei , Li Feng Lei , Zhou Zhao Yao , Tang Zheng Qiang
Published: October 2010

. An analytical model is developed for the prediction of residual stresses in burnishing. The model is simplified as a concentrated force pressing on elastic-plastic half-space using the solution to the Boussinesq-Flament problem. The treated material admits the elastic-plastic properties with hardening using a power law constitutive relation. Trial computation using Johnson-Cook model on AISI 1042 steel is presented and the results are verified with the experimental results given by Bouzid’s previous work. The residual stresses in the feed direction show the same trend with the experimental results while some differences still exist near the surface because of the concentrated normal force assumption and such stresses increase with the increase of burnishing force, decrease with the increase of depth and turn to zero beyond the plastic deformation boundary.
Dynamic Analysis of Ball Vibration Assisted Burnishing
Authors: Li Feng Lei , Xia Wei , Zhou Zhao Yao , Zhao Jing , Tang Zheng Qiang
Published: October 2010

Vibration Assisted Burnishing (VAB) is an advanced burnishing form incorporating dynamic force resulting from vibration into burnishing not only to change the loading type and contact method to greatly reduce friction and wear, but also to produce an excellent nanocrystalline surface by severe plastic deformation induced by high speed impact. The expression describing the relation between decrease of surface roughness and ball burnishing force is given. The dynamic model of ball VAB is established. The relations between VAB depth, VAB force and VAB time and their maximum values are derived, and the required maximum power of the vibration generator is then obtained. The theoretical equivalent burnishing force of ball VAB is only about 47.55% that of conventional burnishing, which prove validity of ball VAB.
Genetic Optimal Design of Straw Crusher Based on ADAMS
Authors: Chen Li Qing , Zhang Jia Qi , Kong Xiao Ling
Published: October 2010

The paper designed a straw crusher device based on genetic optimization design method. Firstly, straw crusher device math model was build. Secondly, taking the cutter shaft as optimized object, the cutter shaft in the working device axis diameter, internal diameter and ratio were set as variables, and taking the lightest quality of cutter shaft as the objective function, to build the mathematical model of straw crusher. Then combined with the GA optimum design method, straw crusher optimization design model and simulation model were optimized. Lastly, the structural parameters of straw crusher and satisfactory results were get. The article improves the efficiency of design and the quality of product; it also provides a new kind of design method for agricultural machinery.
A Nonlinear Dynamics Bond Graph Model of Gear Transmission
Authors: Tang Jin Yuan , Chen Hai Feng , Chen Si Yu
Published: October 2010

A nonlinear dynamics bond graph model of gear pair is established including the time-varying stiffness, transmission error and tooth surface friction. A capacitive component C is introduced to represent the loads and tooth elastic deformation while introducing the concept of switched power junctions (SPJ) to describe time-varying gear mesh stiffness with clearance, and flow Sf represents the influences of the gear transmission error on the system dynamic equations. The tooth surface friction bond graph model involving the relationship of the relative velocity and the direction of friction are developed. According to the causal relations and the power flow, the state-space equations of the gear bond graph model are obtained. Research results show that bond graph modeling method can solve the modeling problem of the gear nonlinear dynamics.
The Finite Element Analysis and Optimization of Micro Free Piston Swing Engine’s Strain Interference
Authors: Lin Ji Jing , Chen Yan Hong
Published: October 2010

MFPSE, Micro Free Piston Swing Engine, is a new type of miniature internal combustion engine based on the working principle of two-stroke swing engine. The successful development and operation of this type of miniature internal combustion engine provide important significance for the miniaturization of the internal combustion engine, and provide a number of important research theory, computation method and experimental data. In this article, according to the work characteristics and co-ordination requirements of MFPSE (Micro Free Piston Swing Engine), whose strain interference is analyzed using finite element analysis software, the problems and interference of the center pendulum and cylinder is found evidently. The data of analysis provides theory basis for the MFPSE’s structural optimization, and is critical to improve the performance of MFPSE.
Study on the Processibility of BMI for RTM Process and Mechanical Performance of Carbon Fiber Three-Dimension and Five-Direction Braided/BMI Composites
Authors: Guo Qi Wei , Li Jia Lu , Zhang Guo Li , He Ye Hong , Zhang Ming , Chen Li
Published: October 2010

The purpose of this study is to investigate the processibility of 6421 bismaleimide (BMI) resin for resin transfer molding (RTM) process and the mechanical performance of 6421 BMI composites reinforced by carbon fiber three-dimension (3D) and five-direction braided preforms. The thermal properties of 6421 BMI resin were investigated using differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). According to these data, the processing parameters and curing rule of BMI for RTM were derived. The flexural test results showed that 3D and five-direction braided composites had higher flexural modulus than that of laminated composites while the flexural strength was lower than that of the laminated composites. The impact strength of 3D and five-direction braided composites is 30.1% more than that of laminated composites. The results of mechanical properties tests indicate that carbon fiber 3D and five-direction braided/BMI composites are suitable for application.
Modeling and Analysis of Main Drive Train in a Power-Driven Turret
Authors: Zhang Wei , Sun Bei Bei , Kang Xiao Bo
Published: October 2010

This work investigates dynamics of a three-stage gear system in a new power-driven turret. This paper mainly consists to develop two kinds of dynamic models of the main drive train. One is the dynamic contact model of the gear system to calculate the dynamic meshing forces and the tooth root stresses. The other is a virtual prototype model adequately incorporating the deformability of the bearings to analyze the dynamical response. The dynamic meshing force and the tooth root stress were compared with the theoretically calculated results. The vibration acceleration signals of the turret were gathered by tests. According to the experimental data, the simulation results of the virtual prototype model were given based on which the rationality of the virtual prototype model is verified.
Velocity and Load Characteristics Analysis of Pump-Control-Motor Hydraulic Drive System
Authors: Long Ming , Hu Ai Min , Gao Zhi Gang , He Xian Jian
Published: October 2010

Pump-control-motor hydraulic drive system is a common used volume speed-modulating loop in hydraulic control system. Aiming at the working conditions of the cutter head of the tunnel excavator used in the large underground excavation, a pump-control-motor hydraulic drive system was applied that composed of three variable displacement hydraulic pumps and eight hydraulic motors, which can control the rotate speed of the cutter head in real time. The simulation model of the pump-control-motor was established using the AMESim software. The relationships among the rotate speed, torque of the cutter head and the system pressure, system flow were investigated in detail under several typical working conditions in tunneling. The relevant results can provide theory references for design of pump-control-motor hydraulic control system in other occasions.
Integrate and Optimized Design of a Hydraulic Underwater Manipulator
Authors: Wang Xian Cheng , Song Rui Yin , Wang Cheng Jun
Published: October 2010

Underwater manipulator as efficient tools plays important roles in ocean exploitation. Because of its specificity for underwater operations, the structure of an underwater manipulator should be designed compactly with light weight and small size. Structure of a 7-function underwater manipulator is designed here. Except forearm rotation and wrist rotation which use hydraulic motors, other functions are driven by hydraulic cylinders, whose parameters are determined by force analysis and limit positions. The hydraulic pipelines from the elbow joint to the end are passed through the forearm, and the hydraulic cylinder of the jaw is integrated into the wrist motor. Built-in pipelines are achieved in the designed structure and the whole weight and volume are greatly reduced by integrated and optimized design.
A Desktop Virtual Reality-Based Interactive Tunnel Boring Machine Simulation System
Authors: Li Gang , Cao Yan , Yao Yu , Wang Wan Shan
Published: October 2010

In this paper, we present the design and implementation of a VRML multi-user layer, which is introduced in the virtual reality platform. A novel 3D simulation system supporting tunnel boring machine (TBM) design is developed. The virtual environment (VE) of the TBM is established by VRML based on virtual reality technology, the 3D assembling model is built by Solidworks software and changed into the virtual environment by VRML format. The optimal method is put forward by three steps optimization data to realize transmission of network. The motion simulation and virtual assembly program for TBM are made by VRML/Java language with the movement simulation control function to realize motion simulation. It has the advantages of free installation, authenticity, interactivity, low-cost, portability, and low requiring for the clients and so on.
Simulations of Thermal Behaviors on a Power-Driven Turret
Authors: Jiang Ke He , Sun Bei Bei , Kang Xiao Bo
Published: October 2010

As core functional components of the medium and high grade CNC machine tools, the power-driven turret involves high technology and complicated structures. Traditionally, in the study of low speed turrets` performances, the effects of thermal influences are often negligible. However, on the high speed conditions, thermal effect cannot be neglected. This paper establishes the high speed turret 3-D Model and the Finite Element Model (FEM), and investigates and analyzes temperature fields and thermal deformations. Experimental measurements are implemented on the surfaces of the original model turret in order to compare with the simulation results, modified turret is analyzed, and thermal behaviors are proved to be available on the idle operating conditions. It manifests that the distributions of the thermal behaviors have intensive relations with the speeds of the transmission system.
The Changing Law of Tooth Bending Stress for Herringbone Gears with High Contact Ratio
Authors: Chang Le Hao , Liu Geng
Published: October 2010

From the principle of generating method, the precise model of an involute herringbone gear was built. The accurate load distributions of herringbone gear were obtained in different meshing positions in linear programming method. Then the changing course of root bending stress along with the variation of meshing position was gained. The calculation process realized the automatic definition of loads and boundary conditions, and found out the value and the position when the tooth root has maximum bending stress. The results showed that the maximum stress usually appears near the position when the tooth bears maximum load. Be different from spur gears, the maximum stress of herringbone gears will possibly appear in the section where more teeth couples are engaged. The analysis can effectively provide reference for checking tooth bending strength of herringbone gears.
Research of Deformation Process Control of Generator’s Retaining Rings on Hydraulic Bulging Strengthening Technology
Authors: Zhao Xian Ling , Liu Jian Sheng , He Wen Wu
Published: October 2010

The hydraulic bulging strengthening technology is a kind of strengthening technology of large generator’s retaining ring. In the right punch working angle and sealing pressure of equipment, the ring billet is deformed uniformly by high pressure water. The experiment in 5MN oil-hydraulic machine proves that the ring billet is deformed uniformly while the punch working angle is 60° and the pressure between the punch and the rings is 1MN. When the internal and external diameter deformation of the ring billet is 8.5% and 14.0%, the external generatrices of the ring are nearly line. The ring billet is 1/5 of 300MW18-18 steel retaining ring. It may improve productivity to measure real-time thickness of the ring billet with ultrasound sensors and control pressure of the oil-hydraulic machine and ultra-high pressure pump with 80c51.
Thermal Equilibrium Analysis of Loaders’ High-Pressure Hydraulic System
Authors: Wang Xiao Bin , Chen Shu Mei , Huang He Ting , Zhuo Ji Wen
Published: October 2010

The Loaders’ hydraulic transmission system trends towards medium and high-pressure. The research object of this paper is thermal equilibrium of new quantitative medium and high-pressure hydraulic system of type 50 of wheel loader, which is developed by Xiamen Xia Gong (XG) Machinery Co., Ltd. (abbreviated as XGMA). Aim is to research the thermal equilibrium of loader’s hydraulic system before increasing the pressure at 16MPa and prove the simulation results reliability through experiment (max error is 11.57%). The simulation results are thought to be reliable, after ignoring some disturbance factors existing in the practical work. Consequently, loader's thermal equilibrium have been done after increasing pressure to 20MPa, the results of research show that thermal equilibrium will be obviously optimized, it will drop power loss (drop 17%) and improve hydraulic system’s reliability and reduce the cost after pressure was raised.
Experimental Study on the Tribological Behavior of CaCO3/PEEK Composites under Water Lubrication
Authors: Lin You Xi , Gao Cheng Hui , Li Yuan
Published: October 2010

The tribological properties of PEEK composites filled with CaCO3 whisker in various content of 0-30%(weight percent) were investigated.The composite specimens were prepared by compression molding. Tribological testing of composites in water lubrication against carbon steel ring was carried out on a MM200 block-on-ring apparatus.Data on neat PEEK were also included for comparison. The morphologies of wear traces were observed by SEM.It was observed that inclusion of CaCO3 whisker significantly improved the wear resistance and reduced the friction coefficient of PEEK composites under water lubricated condition. With an increase in CaCO3 whisker contents, the specific wear rate of composites decreased and showed minima for 20% CaCO3 content as 5.2% of that for PEEK. In terms of friction applications under water lubrication, the optimal content of CaCO3 whisker in PEEK composites should be recommended as 15% to 20%.The SEM observation of the wear traces indicated that the transfer film is not the main reason for the enhancement of wear resistance of the composites in water lubrication.CaCO3 whisker contributed to increase the load-carrying capacity and abate the scuffing and adhesion of PEEK composites, finally led to a significant improvement of the wear resistance.
Numerical Coupling Analysis of Droplets’ Behaviors in GMAW
Authors: Huang Yan Lu , Ke Xin You , Li Yi Bin
Published: October 2010

The forming process and dynamic behaviors of droplets in gas metal arc welding (GMAW) were numerically simulated by using weak electromagnetic coupling method, with considering the gravity, the electromagnetic force, the free surface and the turbulent flow in the droplets. The shape update of the droplets was calculated on basis of VOF and CSF theories. The Gaussian electric current density was identified as boundary conditions for calculating electromagnetic force. A weak electromagnetic coupling model was used to study the characteristics of relevant physical variables and their roles in metal transfer. The simulation results suggest that the maximal value of electric current density lies in the neck of droplets, and the electromagnetic force has great effects of accelerating droplets’ contraction and shortening their falling time. Under the action of strong electromagnetic force, the metal transfer is in a spray form rather than a globular one in GMAW process. The simulated results agree well with theoretical analyses and predecessors’ experiments.
Effect of Adhesive Layer’s Voids on Stress Distribution of Adhesively Bonded Joints
Authors: Zhao Hai Long , Gao Zong Zhan , Yue Zhu Feng , Jiang Zhi Feng
Published: October 2010

The stress distribution of adhesively-bonded single lap joints under tensile shear loading is analyzed using 2-dimensional elastic-plastic finite element method (FEM). Special attentions have been put on the influence of void in adhesive on the stress distribution of adhesively-bonded joints. The results show that the stress concentration of the void is less than that of the end part of the joints when adhesive layer’s deformation was in the range of elastic. Moreover, the influence of the void on the stress distribution becomes less when the void moving from the end-part to the middle. The stress concentration becomes larger and the stress distribution of adhesive’s mid-thickness region becomes flatter when adhesive layer has biggish plastic deformation. Finite element results show an agreement with the theoretical results.
Forecasting and Parameters Optimization of Reflow Soldering Profile Based on BPNN and GA
Authors: Pan Er Shun , Jin Yao , Xu Hu , Liao Wen Zhu
Published: October 2010

This paper proposes an effective method to determine the optimal parameters settings of reflow soldering profile and helps reduce the try-and-error time in practical application. Due to the complex nonlinear relationship between reflow thermal profile and process parameters in this problem, BPNN is adopted to establish the model for description of this intricate relationship between inputs and outputs. According to the requirements of the reflow soldering profile, GA is used to calculate the best input parameters with its strong global research ability. Thus, a combined model with BPNN and GA is proposed for parameters optimization and contributes to reduction of decision time of input parameter for reflow soldering profile. In addition, a case study is given to prove the accuracy of the proposed method.
Dynamic Analysis and Experiment Validation of Linear Motion Guide Having Rolling Elements for NC Machine Tool
Authors: Zhang Yao Man , Xie Zhi Kun , Liu Qi Wei
Published: October 2010

To design a machine tool successfully, its essential parts should be analyzed and evaluated during the process of design. The liner motion guide is one of the most essential parts of the machine tool. So it is very important to analyze the dynamic-static characteristic of the machine tool consider linear motion guide and to study the effect on machinery function. The paper’s research is based on a NC machine tool produced by a certain plant of machine tools. Methods of simulating the linear rolling guide support are studied, and the configuration of the spring damper elements of the bearing supports are also studied, and the finite element analysis on the CKS6125 machine tool has been made to confirm its dynamic characteristics. Then the finite element analysis models are validated by some experiments.
Technology and Characteristic of Wool Ring Spun Compound Yarn
Authors: Zhao Bo
Published: October 2010

The article introduced the mechanisms and characteristics of spinning system such as solo
spinning, sirofil spinning, siro spinning and so on. New composite spinning technology can develop a
composite yarn, thread and fabrics with different characteristics. Composite spinning technology is a
new breakthrough in technology of ring-spun wool spinning. It makes a remarkable improvement in
the quality of spinning. It improves the external quality of yarn. Through comparing and analyzing,
the new technologies enable a great structural change and unique performance of the yarn. This new
spinning technology has broad prospects for development applications.
The Optimization of Cutting Parameter of Machining the Small Diameter Deep Hole on Austenitic Stainless Steel
Authors: Huang Zhi Rong
Published: October 2010

In this paper, objective function for the highest productivity and longer life of the twist drill
is built. Though using Materlab software to draw the curves of the changes of feed, spindle speed, tool
life and productivity, a way to find the better cutting parameters of machining the small diameter deep
hole on the SUS316 austenitic stainless steel with the twist drill is introduced. The better cutting
parameters are obtained.
An Analysis of Drawing Process in Stamping Die Design for the Wheel Hub
Authors: Liu Bai
Published: October 2010

Based on Finite Element Analysis (FEA) module of Dynaform software, the paper made
numerical simulation of a wheel hub’s stamping process in the method of elastic-plastic flow, pointed
out the behavior of deformation of stamping process, predicted and prevented stamping defect such as
crack in the process, and calculated the degree of resilience. Consequently three forming numerical
simulation schemes have been designed respectively, more feasible process parameters has been
achieved in comparison with the features of each scheme.
The Research on Cutting Force in High-Speed Milling Process of Aluminum Alloy Impeller
Authors: Liu Y.B. , Zhao C. , Ji X. , Zhou Ping
Published: October 2010

High-speed cutting process of cutting force influence variables and variation and ordinary speed cutting are obviously different, in order to study the high-speed cutting process of different parameters on the effect of cutting force, based on five axis high-speed NC machining center, using multi-factor orthogonal test method for high speed milling of aluminum alloy impeller conducted experiments. It was analyzed that cutting force influence factors of 5-axises blade machining process. A private clamp was designed and produced, to measure the cutting force of machining process. It was observe that distribution of 3-dimension cutting forces in cutting path. It was found that the distribution rule of cutting force. With the experiment study on cutting force when high speed cutting aluminum cuprum, the influence disciplinarian of each cutting parameter on cutting force was obtained.
Effects of Residual Stress on Interfacial Bonding Strength of Zinc-Plated Film
Authors: Wang Xing Fang
Published: October 2010

The distributions of residual stresses for zinc-plated film were measured quantitatively by X-ray diffraction (XRD), its interfacial structures were observed with scanning electron microscope (SEM). The effects of residual stress on bonding strength of zinc-plated film were investigated, and its influence mechanism was discussed. The experimental results show that residual stresses of zinc-plated film are behaved as tensile stress, which increase with its thickness, bonding strength of zinc-plated film is inverse ratio with residual stresses; the effects of residual stress on film crack are obvious, tensile stress speeds film cracking, which decrease its bonding strength; bonding strength of zinc-plated film is increased by improving its residual stress distribution.
Friction and Wear of Polished Single Crystal Silicon at Different Area
Authors: Yu Shou Xin , Zou D.W. , Zhu X.L. , Sun Yu Li , Zhou L.
Published: October 2010

A friction and wear experiment was carried out at different areas of single crystal silicon under same surface roughness. Friction mechanisms at different area were analyzed by STM and 3D profiler. The result showed that the friction and wear properties were obviously different at different area although they had same surface roughness. The friction and wear properties of the single crystal silicon where closest to inner-cycle internal were best while the farther from the inner-cycle silicon area or closer to crystal silicon cylindrical, the worse friction and wear properties were. Abrasive wear and adhesive wear were the primary wear mechanisms.
Numerical Simulation of the Machining Distortion of Aircraft Aluminum Part Caused by Redistribution of Residual Stress
Authors: Liu Yuan Wei
Published: October 2010

In order to reduce the weight of airplane and increase its mechanical behaviors, more and
larger integrated parts are applied in modern aviation industry. When machining multi-frame
aeroplane parts, more than 90% of the materials would be removed, resulting in severe distortion of
the parts due to the weakened rigidity and the release of residual stress. This might also lead to stress
concentration and damage of the parts. The effect of material removal from residually stressed billet
is simulated using FEA software ANSYS, and the causations of distortion is analyzed. To verify the
finite element simulation, a high speed milling test on aluminum alloy 7050T7351 is carried out. The
results show that the simulation result is consistent with the experimental one. It included that the
original residual stress in the blocks of aero-aluminum component is one of key factors to cause
machining distortion.
Study on Fuzzy D-S Evidence Theory Mathematics Foundation Based on the Form Prototype
Authors: Gao Zhu , Ji Xiao Min
Published: October 2010

Form the prototype for the product information model, based on fuzzy reasoning DS
product matrix form of semantic description of the design method, to achieve a quantitative
description of design and analysis to lay the foundation. In this paper, a prototype of the product
based on the patterns of conventional semantic patterns, based on the optimal degree of semantic
preferences to identify patterns associated semantic description of the object word, based on the
design of space and form of distribution of the overall evaluation of the products were analyzed, the
establishment of a semantic matrix form as product design style formal description of the expression
of the computer model to design the impact of drilling as an example to describe the effectiveness of
the method.
Study on the Influence of Internal Flow Field in Pipeline Elbow by the Guide Plate
Authors: Wu Lan Ying , Wang Yan Lin , Wang Zi Dong , Chen Ming Wen
Published: October 2010

The liquid-conveying elbow is an very important part in the piping system, in this paper,
the internal flow field in the pipeline elbow is studied, its structure is optimized, and the guide
characteristic is improved. The results show that the internal total pressure difference in the original
elbow is 29506.27 Pa, the Max-velocity is 7.12 m/s, and the internal flow field is very uneven；The
internal total pressure difference can be greatly reduced through setting up the guide plates
appropriately, its internal total pressure difference decreases as the number of guide plates increases,
the Max-velocity decreases first and then increases as the number increases; When the number is a
constant, the optimal result of guide plate according to the gold ratio arrangement is superior to the
equidistance ratio arrangement; When the export length of guide plate is 50 mm, the total pressure
difference is 14942 Pa in the elbow, comparing it to the result of the original elbow, it decreases
49.26%, the optimal design has an very obvious effect.
Research on Electrical Resistively of Wood Dust
Authors: Zhou Han Dong , Liu Zhen Ning , Lei Xiao Bao
Published: October 2010

In order to design an ESP (electrostatic precipitator) used for the domain of wood
processing, electrical resistively of Wood dust should be understand clearly. The ESP could be
applied to the dust of which the specific resistance was 104~1011Ω·cm. Dust specific resistance
was related with temperature, humidity, the ingredients of dust and so on. Therefore it must be
firstly that the specific resistance of wood dust was researched to decide whether the electrostatic
dust separator was applied in wood industry.
Primary Research of Bionic Design on Tools with Mouthpart of Larvae Long Horned Beetles
Authors: Zhang Kai , Ji Bao Zhong , Liu Shu Wen , Qing Zhen Hua
Published: October 2010

Bionic design is a new method in engineering design. The mouthpart of the larva long
horned beetle and its tunnel in wood are discussed in this article. To improve the cutting properties
and tool life are always the main aim of cutting tool design. The foreground of cutting tool design
using the larva long horned beetle is discussed on the bases of the mouthpart maxillae of
Aphrodisium sauteri (Matsushita) and the tunnel in Quercus myrsinaefolia. The research can also
make direction at new tool material and tool geometry parameter design.
Adsorption Analysis of Cr(VI) by Fly Ash Composite Material in Aqueous Medium
Authors: Xue Hong Qin , Jing Zhao Qian , Wang Zheng
Published: October 2010

The adsorption technique using fly ash composite material has been applied for the removal
of Cr(VI) from aqueous samples. Batch experiments have been carried out for the adsorption of Cr(VI)
onto fly ash composite material. The effects of various process parameters, namely, pH, adsorbent
dosage, initial Cr(VI) concentration and contact time has been studied in batch systems. Maximum
metal removal ratio was observed at pH 5.0~5.5, and the sorption reaction was an endothermic process.
The results revealed that the hexavalent chromium is considerably adsorbed on this adsorbent and it
could be an economical method for the removal of hexavalent chromium from aqueous systems.
Research of Controlling Heat Treatment Deformation for Powder Metallurgy Mechanical Structural Parts
Authors: Yan Yin Biao , Shen Xiao Ping , Zhang Di , Li Ming Wei
Published: October 2010

The paper is based on actual production condition, by taking relevant measures; we can
effectively control heat treatment deformation, and attain the accuracy as well as performance
requirements of powder metallurgy mechanical structural parts.
Influence of Vacuum Heat Treatment on Sintered W-Cu Alloy Performances
Authors: Yan Yin Biao , Shen Xiao Ping , Li Ming Wei , Zhang Di
Published: October 2010

The paper has studied influence of vacuum heat treatment on Sintered W-Cu
Alloy performance with metallography, conductance and micro-hardness examination. It has
shown that sintered W-Cu alloy was heatreated in the vacuum, changes of its performance has taken
place clearly. This changing cause is from the purify and diffuse of Cu in the vacuum heat treatment.
Design on Numerical Control System of Glass Cutting Machine Based on PC
Authors: Wang W.
Published: October 2010

Based on introducing the overall structure of numerical control system of glass cutting machine, this paper describes the software framework of the system, and gives the design idea of the various modules, then introduces a system application example.
Research of Asynchronous Multi-Type Sensors Data Fusion
Authors: Qin Y. , Wang Xue Hui , Feng Ming Jun , Zhou Zhen , Wang L.J.
Published: October 2010

A data fusion algorithm was established for estimating the state of target tracking system
with multi-type sensor. Through Kalman filter regarding the multi-sensors to computer goal
estimated value, it can obtain estimation value of goal at moment. And mean square deviation of
fusion estimation value was smaller than single sensor's mean square deviation. The simulation
results indicated that synchronisms data fusion method was effective to the multi-target tracking
problem. Asynchronous multi-sensor fusion process can obtain good control effect in the practice
control process.
Fast Frequency Hopping Signal Generator Based on DDS
Authors: Du Y.H. , Ouyang Q.R.
Published: October 2010

Frequency hopping has been the most popularly considered approach for alleviating the
effects of jamming attacks. In this paper, the features and application of frequency hopping
communication technology are introduced briefly, also a solution of fast frequency hopping using
AD9910 is proposed. The design principle and feasibility of implementation are analyzed and
described in detail. It can improve the speed of frequency hopping tremendously.
The Optimization of Material Thickness for Neutron Shielding with Monte Carlo Method
Authors: Chen C. , Wang M.
Published: October 2010

Some materials are selected for shielding neutron radiation in this paper. The thickness of
shielding materials is optimized with Monte Carlo method. The materials and optimizational
thickness are: Tungsten 6cm, Polythene 8cm, Cadmium 1cm and Stainless Steel 1cm
A Method to Measure Rotary Speed and Torque Using JC Sensors
Authors: Wang Qiang , Song Sheng Li , Zhao Wei
Published: October 2010

A method for rotary speed and torque measuring using JC sensors was introduced in the
paper. The approximate sine signals output by JC sensors are transformed into rectangular signals by
the transform circuit. The checking circuit consists of an 8031 singlechip, it determines the rotary
speed by measuring the frequency of the rectangular signals, and determines torque by measuring
their pulse width.
Different Evaluation Approaches of Confusion Network in Chinese Spoken Classification
Authors: Zhang Lei , Chang Jing Xin , Xiang Xue Zhi
Published: October 2010

As kind of multiple results in speech recognition system, lattice and confusion network are widely applied in spoken document classification and spoken document retrieval. In this paper, the relation between lattice and confusion network is analyzed firstly. Then based on the confusion network by clustering algorithm, different evaluation approaches are applied here to test the performance of confusion network, which include accuracy, complexity and distortion of confusion network. For the experiments on speech recognition system, it can be drawn that compared with 1-best result, confusion network can have higher words accuracy.
Study on Mine-Used Battery Locomotive Charging System
Authors: Xuan Li Ping
Published: October 2010

According to the insufficiency of large volume, high cost and poor dynamic response in
the traditional mine-used battery locomotive charging system. This paper presents a design scheme
on this system based on DSP TMS320F2801 which directly using SPWM conversion control
technology, generating the SPWM wave through DSP control chip and convert the alternating current
under the mine into the corresponding pulse charging current. The results show that the system can
achieve the goal that well system stability, good dynamic performance, control circuit simplified,
high charge efficiency and low cost.
Steel Wire Rope Section Damage Detection System Based on Wavelet Multi-Resolution Analysis
Authors: Xuan Li Ping
Published: October 2010

According to the characteristic of the steel wire rope section damage, eliminate the steel
wire rope damage signal noise by using Wavelet Multi-Resolution Analysis and the steel wire rope
damage characteristic parameters were extracted. Adopting the voltage amplitude calibration
technology recognize the steel wire rope damages. The results show that the proposed system can
identify the steel wire damage degree effectively and achieve the goal in steel wire rope safety use.
Three-Level SVPWM Controller Design Based on FPGA
Authors: Chang Guo Xiang , Li Wen , Liu Xiu Ling
Published: October 2010

Compared with traditional two-level inverter, the multilevel inverter has many advantages
such as large output power and small output harmonic. And also it is one of the hot research subjects
in recent years. Although SVPWM control is an excellent control method, its space vectors is
exponential with the increase of the number of output levels of the multilevel inverters. If the
SVPWM is controlled by DSP, a lot of components can be used. So this paper puts forward a new
method which SVPWM signals generate by PGFA directly. The fact has proved that pure hardware
design is feasible and has rapid response rate, facile programming and online configuration.
Phase Error Immunity Optical Measurement System
Authors: He Wan Tao , Meng Xiang Lin , Zhao Can
Published: October 2010

In this paper, a 3D shape measurement system based on a digital fringe projection and
phase-shifting technique was described. The fringe generated by a computer was projected onto the
object by utilizing a digital video projector. Four steps phase shifting algorithm was used to calculate
the 2π wrapping phase, and a heterodyne principle was used to unwrap the phase to obtain the real
phase. Then the 3D coordinates object was calculated base on stereo vision algorithm by using the
real phase as a constraint. Experiments demonstrated that the system was not sensitive to the phase
error caused by the DVP’s nonlinearity.
A Stable Least Squares Ellipses Fitting Algorithm Based on Zernike Moments
Authors: Meng Xiang Lin , He Wan Tao , Zhao Can
Published: October 2010

This paper presents a stable least squares ellipses fitting algorithm based on Zernike orthogonal moments. The algorithm uses Zernike orthogonal moments for sub-pixel edge detection, and a mask of seven multiply seven was derived in the meantime. The optimal ellipse parameters were computed according to the data points extracted previously. This stable, robust and non-iterative algorithm can be easily implemented. The experiment results show that the proposed algorithm is effective in various situations.
Accuracy Verification Method about Optical Three-Dimensional Measuring Instrument
Authors: Zhao Wei Ling , Zhao Can , Cheng Jun Ting , Yue Hai Yan
Published: October 2010

Three-dimensional measuring instrument has high precision, high efficiency, convenience, and the stability characteristics, and is widely used in many manufacturing industries. In the process of equipment purchases and transportation, there is the need for precision test equipment. Reference to the VDI/VDE 2634 standard developed by German and equipments of other manufacturers, make reasonable accuracy test method, according to measurement data maximum error, minimum error, average error, standard deviation concept, calculate the measurement comprehensive system error, and calculate its accuracy for foreign equipment.
Contrast Research on Cutting Forces in 4-Axis and 5-Axis Blade Machining Process
Authors: Wu Tong , Zhao Can , Bu Guang Bin , Zuo Dun Wen
Published: October 2010

In this paper, test method was used to study the distribution of cutting force while blade
machined with 4-axis and 5-axis NC program. The main difference between the two program was
given. The difference of machining forms between 4-axis and 5-axis has led to their cutting forces
distribution were different. The change of cutting force in 4-axis machining was large while the
5-axis machining was relatively stable. 5-axis cutting force had no impact comparing with 4-axis,
which is more suitable for blade machining.
Researcher of Region Growing Medical Image Segmentation Based on Adaboost Algorithm
Authors: Wang Peng , Ye X.F. , Yin Shi Wei , Kang Shao Chen , Xin Jing Lei
Published: October 2010

To obtain better region extraction results of medical image, a new segmentation algorithm
is proposed based on improved Adaboost algorithm. The seed pixel is selected with background
subtraction. The neighborhood point is judged. The primary selected seed is calibrated with label, and
then the range of seed is reduced through growing label and the maximal saliency. The optimized
Adaboost algorithm is taken as growing criterion to optimally combine the scrappy region when the
region growing is over. The experiment result shows that the accuracy and robustness of the
algorithm both meet the actual application required.
A Method to Center Extraction of Reference Point Algorithm in Reverse Engineering
Authors: Che Xiang Qian , Cheng Jun Ting , Xiao Sheng Bing , Ma Jia Jun
Published: October 2010

In reverse engineering, in order to get the entire point data of the object surface, which must be merged from point data cloud obtained from different angles. And in order to acquire exactly merge effect, a method to stick reference points on object surface to acquire base point. Thus, the precision of center extraction of reference point affect the merge result. Firstly a new method to center extraction of reference point is presented based on the characteristics to the images in reverse engineering in this paper. And the new method is that the region recognition algorithm combining to least squares algorithm. Secondly, in order to improve the computational efficiency, the modified sequential algorithm is applied to optimize the region recognition. Lastly, the availability and accuracy to the new method are proved by the experiment.
Optimal Design of Flexible Manufacturing System Based on Optical Measurement Principle
Authors: Wang Shao Sheng , He Wan Tao , Liu Rong Bin , Cheng Jun Ting
Published: October 2010

The material recognition and size measuring cell is very important for the development and
practicability of flexible manufacturing system (FMS). However, the existing FMS mostly recognize
the two-dimensional shape of the workpiece, measure the one- dimensional shape of the finishing
product. This greatly limits the performance of FMS. In this paper, these cells have been optimally
designed to identify and measure the three-dimensional shape of the workpiece based on the optical
measurement principle. The method has the advantage at robust recognition rate and high recognition
quality.
Material Removal for Modal Effect on Impeller Blades by Finite Element Analysis
Authors: Wu Wei Hua , Zhao Can , Bu Guang Bin
Published: October 2010

In order to articulate the modal change in the whole processing blades, take the finite
element method to establish the simulation model of blades and blank remains, and then get the
results of blade model with material removal. According to the blades processed vibration
characteristics, to perform an experiment on the six different removal blades. The results show that
material removal has a great effect on the modal frequency in the processing of blades, which is
increasing constantly. The first-order frequency and the second-order frequency in material removal
that are about 12 mm and 7 mm don’t reach a maximum and then show a decreasing trend until the
completion of processing. Effectiveness of experimental results is verified since simulation results
are well consistent with experimental results, which offers a reference for choosing the parameters of
blades process and studying three-dimensional vibration mechanism.
Rotation Inertia Measurement Device Design of Winged Rigid Body Based on TRIZ Conflict Resolving Matrix
Authors: Chi Hong Yan , Cao He
Published: October 2010

In this paper TRIZ(Theory of Inventive Problem Solving) conflict and its resolving
theories are introduced. Then the technology conflict of winged rigid body rotation inertia
measurement is analyzed and based on the conflict resolving matrix and innovative principles
synthesis application, the winged rigid body rotation inertia measurement solution is created. It is
beneficial for rotation inertia measurement device design.
Development of NC System of the 3-PUU Parallel Machine Tool Based on PMAC
Authors: Lin Hai Peng , Xu Yi Min
Published: October 2010

In this paper, a PUU parallel machine tool with three translational degrees of freedom
(DOF) is designed which is usually used in the complex grain machining of the solid rocket engine.，
and its numerical control system is described in detail. The so-called “PC+PMAC” is used as the
hardware platform, and Windows as the software one, the parallel machine tool NC system is built.
The features, such as multi-axis motion control and fast real time communication of PMAC, software
resources and efficient data processing of PC are utilized such that Man Machine Interface, position
servo control, real time measurement of cutter configuration and closed loop control of the parallel
machine tool are realized.
Finite Element Analysis and Dynamic Testing for Hard Gear Cutting by Gear Hobbing Machine
Authors: Liu Ming Hui , Liu Xiu Lian
Published: October 2010

While cutting big modulus hard gear with gear hobbing machine YB3180H, the vibration
is big and the efficiency is low. To improve this situation, the pulse excitation method is used in
analyzing the six steps modal of the gear hobbing machine. Through comparing with the body test
modal analysis result, correcting and establishing 3 D ANSYS modal of the body, and the weakness
of the machine tool vibration is confirmed by finite element analysis of 3D modal. the theoretical
basis can be provided to the machining, the machinery design, improvement and optimization of the
machine body.