bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on Control of the Electronic-Mechanical CVT
Authors: Zhang Lei , Li Guo Ning , Liu Yan , Cheng Nai Shi
Published: November 2010

Nowadays, the variable speed function of metal belt CVT assemblied on vehicle is completely based on hydraulic system which is driven by the engine. The extra energy consumption is obvious and the reliability is low during the speed-change process of system because of low efficiency of hydraulic components such as pump and valve. In this paper, Electronic-Mechanical CVT (EMCVT) that is a new kind of metal belt CVT is proposed, which uses DC motor driving system to implement the variable speed function. The model of speed ratio control and the clamping force of cone-plates control is established and the PID algorithm of speed ratio control is presented while the transmission principle and mechanical structure of EMCVT is introduced through the study of artificial characteristic of DC motor and dynamics of the system.
The Structure Design and Finite Element Analysis of the Self-Moving Silent Piler Based on the Pile Reaction Force
Authors: Zhou Wei Bing , Ouyang Xiang Bo , Li Ke Tian
Published: November 2010

The self-moving Silent Piler based on the pile reaction force is a new kind of construction equipment by static pressure hydraulic pressure, which utilizes reaction force derived from fully installed cement column to support the silent piler body. The construction characteristics and working principle of the silent piler have been discussed in this paper. The structure of the device has been designed. The FEA to the main stress components and force has been analyzed.
Analytical Robust Design of a Gear Milling Machine Headstock
Authors: Chen Yong Liang , Liu Shuang , Wang Han Tao , Gu Pei Hua
Published: November 2010

Headstock is a key component of gear milling machine. The dynamic functional performance of the headstock is usually influenced by uncertainties of both geometric and non-geometric design parameters. A new mathematical model to represent relationships among first frequency and design parameters of the headstock were derived with Rayleigh method. Then, a larger-the-better and smaller-the-better robust analysis and optimization model was developed. The sensitivity analysis results show that height of the headstock makes a great impact on the first frequency. Through robust optimizations, the first frequency is scaled up by 3.35 percent while minimizing the variance of the first frequency.
Walking System Design on Land Auto-Mobile Agriculture Spraying Robots
Authors: Yang Chao Zhen , Zhang Shi Quan
Published: November 2010

This paper applies terrain vehicle mechanics theory to analyze and solve the traffic-ability characteristic of the field-steering spraying robots, to guide the walking system design and selection of walking wheels. The presented four-motor-drive plan, which is based on the comprehensive analysis of power, steering, driving and control system, could conveniently realize four-wheel steering and four-wheel drive. This plan had the characteristics of simple structure, reliability and flexible control, comprehensively resolved the key technique of robots operation. It is of a high reference value for the design and research of the auto-mobile robots walking mechanism and control system.
Analyzing of the Thermal Stress and Fatigue Life of the Liquid Core Heavy Reduction Rolling Mill’s Roller
Authors: Sun Deng Yue , Zhang Yuan Fang , Zha Xian Wen , Liu Wen Wu , Ma Hui Wei , Fan You Qin
Published: November 2010

The key technology of the liquid core heavy reduction rolling mill relates to the roller’s normal life cycle in a bad work condition. It is the guarantee of continuous production. This paper simulated and calculated the two roller types which are built-up welding roller and roll-sleeve type roller, material of the rollers is H13 (4Cr5MoV1Si) which has better synthetical mechanical properties. It also calculated the fatigue life under the steady temperature, stress and strain fields after rolling for five cycles though the strain-life method.
Application of the Structural Topological Optimization in the Column Stability Design
Authors: Bian Bing Chuan , Peng Guan Ming , Sui Yun Kang
Published: November 2010

In this paper, according to the ICM (Independent Continuous Mapping) method, the topology optimization problem of continuum structures is solved. The topology optimization model for the continuum structure is constructed, which minimized weight as the objective function and was subjected to the buckling constraints. Based on the Taylor expansion, the filtering function and the Rayleigh quotient, the objective function and the buckling constraint are approximately expressed as the explicit function. The optimization model is translated into a dual programming and solved by the sequence second-order programming. Finally, the compressed bar examples are presented. They verified the length coefficient which is converted into stability bar hinged at both ends, identified the location of bottlenecks in topological structures. According to the results, more reasonable topological structures were given.
Application Research on Collaborative Design of Engineering Machinery Design
Authors: Guo Ke Xi , Huang Ying , Zong Hua
Published: November 2010

This paper elaborates the main contents of collaborative design supported by computer and discusses cores of collaborative design architecture of engineering machinery and real-time collaboration under the CAD environment. Under the collaborative characteristics of simulation technology, it expounds the notion of collaborative simulation and operational environment. Finally it points out that cooperative work supported by computer has a broad applied prospect in the manufacturing industry of engineering machinery.
Axis to Plane Perpendicularity Error Evaluation Based on New Generation GPS
Authors: Sun Yong Hou , Zhang Jing , Huang Mei Fa , Huang Jiang Tai , Cheng Xiong
Published: November 2010

In this paper, a method for axis to plane in random direction perpendicularity error evaluation based on new generation GPS is proposed. On the basis of a comprehensive study about the definition and measurement method of perpendicularity error, the evaluation model based on the minimum zone conditions is established. Datum plane is transformed to coordinate plane through transition matrix, so the perpendicularity error of measured element to datum plane can be transformed to that of measured element to coordinate plane. The evaluation model is simplified. Example shows that the perpendicularity error of axis to plane can be evaluated accurately and effectively.
Calculation Method for the Theoretical Displacement of Cycloidal Pump
Authors: Wu Yang Fang , Xia Chun Lin , Shi Yong Gang
Published: November 2010

Based on meshing principle, a calculation method for profile curves in a kind of cycloidal pump was proposed. According to the definition of the theoretical displacement and the accurate profile coordinates of cycloidal pump, the accurate calculation method for displacement was obtained. The accuracy comparison between this method and the usual approximation equation for the displacement was also given in this paper. The results show that this method can get the precise theoretical displacement of cycloidal pump, is convenient for the scientists and technicians reference to design and manufacture directly.
Design and Optimization of the Suspension System on the Wheel-Tracked Exploration Robot
Authors: Shang Wei Yan , Qiu Fa Ju
Published: November 2010

In order to improve the ride performance of the wheel-tracked exploration robot, the suspension structure characteristics of wheel-tracked exploration robot have been analyzed, and the vibration model of the robot has subsequently been established. The stiffness coefficients and damp coefficients of the suspension system have been optimized, and the best mach program has been obtained. The study not only implements the optimization design of the suspension system, but also provides reference to other similar design problems.
Design Intervention for Social Innovation: Two Service Design Workshops in Italy and China
Authors: Gong Miao Sen , Zhang Ling Hao , Zhang Xian
Published: November 2010

Social innovation is an emerging perspective of radical innovation transiting our society towards sustainability. Design, dealing with innovation issues, is supposed to play an important role in promoting it. Two workshops in Italy and China are organized as a pilot exploration with inter-cultural perspectives in service design for grassroots social innovations. Results show that service design can be a viable approach to intervene social innovations. Service design experiences are concluded in terms of local context, problem definition, targeting group and new business mode.
Design of 2-DOF Micro-Positional Stage Based on Parallel Structure Using Flexible Plate
Authors: Chun Hua , Cui Yu Guo , Li Yong , Qiu Lei
Published: November 2010

A new prototype of 2-DOF micro-positional stage was designed based on parallel structure according to the following requirements of the stage, such as, symmetrical structures in X and Y directions, decoupling movement in X and Y directions, large operating surface, and more simple and compact structure. Using double flexible arched plate, the specified structure of the stage was designed by considering the realization of its movement. Static and dynamic characteristics of the stage have been analyzed by using the finite element method. For the static performance, there is a linear relationship between the displacement of the stage and its driving force. The maximum displacement of the stage is about 36 μm under the maximum force 650 N. For dynamic performance, the natural frequency and the response time of the stage are about 2.4 kHz and 1.4 ms, respectively.
A Novel Feature Extraction Method Using Ant Colony Clustering Analysis
Authors: Zhao De Bin , Yan Ji Hong
Published: November 2010

A novel feature extraction method is presented by combining wavelet packet transform with ant colony clustering analysis in this paper. Vibration signals acquired from equipments are decomposed by wavelet packet transform, after which frequency bands of signals are clustered by ant colony algorithm, and each cluster as a set of data is analyzed in frequency-domain for extracting intrinsic features reflecting operating condition of machinery. Furthermore, the robust ant colony clustering algorithm is proposed by adjusting comparing probability dynamically. Finally, effectiveness and feasibility of the proposed method are verified by vibration signals acquired from a rotor test bed.
Design of Rank Accuracy Detection System for Screw
Authors: Meng Zhao Xin , Li Zhi Wei , Cao Jun
Published: November 2010

In view of defects of static detection for screw, such as low efficiency, man made errors, this paper designed a dynamic detecting system, which employs two-frequency laser interferometer as the displacement benchmark and encoder as the angle benchmark. According to the lasting standards, the solution procedure of error evaluation algorithm is optimized by least square method to reduce computation. Experiment shows this system can dynamically detected screw, of which rank accuracy is more than two.
Development of CNC Lower Pressure Water Jet Cutter
Authors: Zhang Dong Su , Dong Zu Wei , Chen Bin , Yang Li Zhi
Published: November 2010

A new lower pressure water jet cutter has been invented, which adopts the technology of premixed abrasive jet and computer numerical control (CNC). A series of technical problems had been solved such as abrasive screen classification, abrasive tank filling, abrasive consistency regulation, valve group sequence control, etc, which are essential in the application of this technique. The structure, working principles, main technological parameters and practical application of the cutter are introduced in this paper. Experimental results show that the water jet cutter can cut steal, glass and other materials. It is characterized by its high efficiency, low specific power consumption and fine automation level. Therefore it is a new type of cold cutting machines.
Dynamic Characteristics Analysis for the Bed of CNC Machine Tool
Authors: Zhang S.R. , Li X.G. , Yang L.F. , Yu B.
Published: November 2010

The experimentation modal analysis is made in the bed of the CNC machine tool with the hammering method of the pulse excitation. Then the dynamic characteristics of this bed are studied and the natural frequency of the bed in the specified frequency band. It supplies a clear reference for the structured optimum design of the bed through the analysis of the main mode on every rank.
Dynamic Characteristics Analysis of Precision Linear Rolling Guide CNC Grinding Machine Tool’s Bed
Authors: Deng Xiao Lei , Fu Jian Zhong , He Yong , Chen Zi Chen , He Zhen Ya
Published: November 2010

Bed is a main component of a large precision linear rolling guide CNC grinding machine tool Its dynamic characteristics impact on machine tool’s machining precision and stability directly. In this paper, boundary conditions on the bed of a machine tool factory’s production are analyzed. By using FEA method, the bed finite element models for dynamic analysis model are established and calculated. It provides guidance in investigating the effect factors of machining precision, the machine tool’s structure optimization and error compensation.
Dynamic Simulation Analysis on Flexible Assembling Fixture for Aircraft Panel Component
Authors: Qu Li Gang , Pan Ke Qiang , Chen Xin
Published: November 2010

Flexible assembling fixture (FAF) is a new-style assembling equipment in assembly process of aircraft panel components, which is developed based on combination of digitization of assembling and automated modular fixture. The multi-actuator is designed to positioning and clamping the panel component. The dynamic behavior of the FAF is analyzed in process of 3D structure design. The motion and displacement of every actuator are analyzed based on kinematic and dynamic theory, by means of building the Knopoff model taking friction between the vice sport into account. ADAMS is employed to carry out the dynamic simulation. This technical approach is the effective solution for developing the new equipment; moreover, its result presents a great engineering significance in improving the equipment performance.
Effect of Specimen Ball Diameter on Contact Stress
Authors: Zhou Jing Ling , Wu Guo Qing , Chen Xiao Yang , Zhu Wei Nan
Published: November 2010

By using a new type pure rolling fatigue test rig with three contact points for silicon nitride bearing ball specimen, the contact deflection angle of specimen with three contact points is calculated. The effects of the center height and test ball radius on the specimen contact deflection angle are analyzed. The analysis indicates that the span of contact deflection angle is 0-0.181° while the center height is 1.2mm and the design radius is 6.35mm and the specimen radiuses change from 4mm to 8mm. The more contact deflection angle is, the more variation rang of test ball radius is. The contact deflection angle can be less than 0.2° while the center height is optimized. The contact deflection angle has a direct influence on the stress error of the specimen. It is less than 1% while the contact deflection angle is less than 0.2°. The research provides a theoretical basis for optimization of test rig structure size and increase of specimen’s extension and improvement of test precision.
Effect of Wheel Elasticity on Grinding Stability
Authors: Yu Ai Bing , Dong Liang , Wang Yan Lin
Published: November 2010

Grinding stability was analyzed concerned with contact deformation and contact stiffness of wheels. Elastic deformations of the grinding wheel were measured with inductance sensors. Dynamic grinding system model was set up. Relation between contact stiffness and chatter growing index was analyzed. Chatter suppression experiments with variable grinding speeds were carried out. When wheel is in contact with a workpiece, contact deformation can occur. The contact stiffness of grinding wheel is a variable. The relation between chatter growing index and contact stiffness is an increasing function. Chatter growing index can be decreased by lowering contact stiffness of wheel. The grinding system stability will be improved with variable grinding speed.
A Review of Surface Texture of Tribological Interfaces
Authors: Wang Zhi Wei , Chen Mei Wei , Wu Jian Wei , Zheng Hai Hui , Zheng Xiao Feng
Published: November 2010

Surface texture of tribological interfaces has the potential to improve friction and lubrication performance of various mechanical components. This review paper emphasizes on the current status of the research of surface texture, including the features, the effects on tribological performance, the forming techniques, and the modeling and simulation of surface texture. It is intended to help readers to gain a more comprehensive view on surface texture of tribological interfaces.
Experimental Investigation and Research on Forming Process of Micro Flat-Wire
Authors: Fok Chun Chiu , Guo Zhong Ning , Yu Zhao Qin , He Jian Wen
Published: November 2010

The aim of this study is to get a better understanding of Micro Flat-Wire Roll Forming Technology. There are three methods for Mirco flat-wire forming, i.e., drawing, extrusion, and rolling. Without replacing the equipment, rolling method only demands to adjust the relative roll gap between the pressure and the wire deformation that it can produce different specifications of mirco flat-wire. The rolling equipment was introduced and can be divided into three parts, the mechanism section, the control part and the wire-locating device. Furthermore, the rolling process parameters were summarized as well. The effect of rolling amount and rolling speed on the wire surface quality was also discussed.
Experimental Study on High Alloy Antifriction Cast Iron in High-Speed Cutting
Authors: Ma Lian Jie , Zhou Zhen Tang
Published: November 2010

In cutting experiment, high alloy antifriction cast irons were selected. Through high-speed cutting experimentation, the materials’ performance and requirement for tools were analyzed. The feasible cutting capacity and tool parameters were ascertained. The cutting defect and solving method were discussed. The results indicate that there are high hardness, high wear resistance and brittleness of high alloy antifriction cast irons. In ensuring the technical requirements of work-piece machining, PCBN is a better tool material. When the tool orthogonal rake angle =-6°, the tool’s durability is higher and machining quality is better. High cutting efficiency can be obtained, when cutting speed vc is from 75 to 100 m/min, the feedrate f is less than 8 mm/min, and the cutting depth ap is from 0.1 to 0.3 mm. These cutting dosages are appropriate in machining high alloy antifriction cast irons.
A Scheduling Algorithms of DNC Systems Based on CAN and Program Expending Rate
Authors: Cai Hui Lin , Li Zong Gang , Ren En En
Published: November 2010

In order to avoid communication conflicts in DNC systems, the scheduling tactics adopting a modified guaranteed EDF algorithm to DNC systems’ numerical control (NC) programs transmission was proposed. A condition was given to guarantee all NC machines in DNC systems work continuously. A mathematic model based on the actual expending rate of NC program was established to decide the priority of NC program transformation of all NC machines. A constraint condition for two machines with neighbored priority was proposed to avoid the conflict in the scheduling times. A dynamic scheduling scheme was presented for DNC systems. The validity of the presented method is verified by the practical tests.
Failure Analysis of Hydrogen Corrosion of the Lens Gasket
Authors: Ma Xiao Chun , Xu Guang Fei
Published: November 2010

The 10MoWVNb steel lens gaskets are widely used for the flange linking of high pressure tube in the synthetic ammonia system in chemical fertilizer plant. The gasket worked in H2-N2-NH3 environment at the temperature of 300°C. It often fails because of hydrogen corrosion. The microstructure and corrosion characteristic of the lens gasket were studied by optical microscope. The results showed that the hydrogen blister appeared preferentially at the interface of inclusions. The corrosion depth was 0.65 millimeter. There were little intergranular crack on inner surface.
Finite Element Analysis of Radial Bearing Magnetic Field
Authors: Wu Guo Qing , Zhu Wei Nan , Zhou Jing Ling
Published: November 2010

There is a magnetic field inside of the radial bearing. The magnetic field distribution is one of the key factors that decides the running state and performance of the system. By using the finite element ANSYS software, the magnetic field of radial bearing was analyzed. The analysis indicated that NSSN mode is suiTable for magnetic radial bearing and NSNS mode unsuiTable. There is a magnetic coupling between magnetic poles. There is magnetic leakage for radial bearing, which leaks towards spindle center through rotor and to coil, but it is very little, less than 5%. The research provides a theoretical basis for optimization of system structure and controller design.
Geometric Information Measurement Based on Structured Light
Authors: Ma Zhang Jian , Dai Ning , Cui Hai Hua
Published: November 2010

In order to detect the distance automatically, a distance detect system was established. It applied methods such as how to obtain the laser center, how to obtain the three-dimensional information, and so on. First, set the width threshold and depth threshold to locate the laser, then searched the follow laser in a nearby region, and found the laser center by geometric methods. Second, reconstructed the laser center, transformed the data coordinate, converted the data into plane, finally computed the distance by geometric and statistics methods. Experimental results show the laser center data are continuous, noiseless. The precision of the step height is 50μm.
Improved Sensing Block Method and its Application in Measurement of Dynamic Load
Authors: Yuan Hong Lian , Dong Xin Long , Yang Jie
Published: November 2010

In this paper, the sensing block method proposed by Tanimura etc. which would be used to measure the dynamic force, was discussed numerically by LS-DYNA finite element. The influence of reflected stress waves from the base block were analyzed when the sensing projection was in a larger size range. The result shows that it can’t measure the dynamic load accurately with increasing the size of sensing projection. Furthermore, an improved method was developed and discussed with its application in the large-scale device for measurement of the dynamic load.
Inclination Errors Evaluation of Planar Lines with a Chaos Optimization
Authors: Zhang Ke , Cao Xiao Ming
Published: November 2010

To improve inclination error evaluation of planar lines, chaos optimization is proposed to evaluate the minimum zone error in this paper. The evolutional optimum model and the calculation process are introduced. By using the properties of ergodicity, stochastic property, and “regularity” of chaos, the efficiency of chaos optimization algorithm (COA) is much higher than some stochastic algorithms such as simulated anneal algorithm (SAA) and genetic algorithm (GA) when COA is used to a kind of continuous problems. The chaos optimization algorithm can improve the efficiency of searching in the whole field by gradually shrinking the area of optimization variable. Finally, the control experiment results evaluated by different method such as the Least Square, Simplex search, Powell optimum methods and GA, indicate that the proposed method does provide better accuracy on inclination error evaluation.
Intelligent Control System for Ceramics Ball Test Rig
Authors: Zhou Jing Ling , Chen Jian Chun , Wu Guo Qing , Chen Xiao Yang
Published: November 2010

An intelligent control system for ceramics ball rolling contact fatigue test rig based on LabVIEW was designed. The system consists of four functional blocks, which are data acquisition block, signal processing block, state recognition block and diagnosis decision-making block. The data in the test process such as load, vibration, speed, fatigue life and so on, are collected and recorded automatically. This system can alarm or shutdown once the test rig state is abnormal or the truncate time is satisfied. By using wavelet transform and other methods in the vibration signal processing and analysis, the failure parts can be detected accurately according to the spectral characteristics and the fault characteristic frequency of the parts. The intelligent control system has practical advantages. The high precision, fast response, low cost, accurate judgment and convenience manipulation are very desirable for ceramics ball rolling contact fatigue experiment.
Investigation of SPR Mechanical Performance with Aluminum Alloy Sheet
Authors: Zhao Jing Hua , Wan Shu Min , Li Shuang Yi
Published: November 2010

In this paper, the technology of self-piercing riveting (SPR) with half-hollow rivets was investigated using experiments and numerical simulations with 6063 aluminum alloy sheet. The failure mechanism of SPR aluminum alloy sheet was indicated with the shear model and tear model, which could accurately simulate the sheet structure. Based on the simulation results with finite element method (FEA), the effect of die geometry on static mechanical characteristics, including punch load, failure load and failure displacement, was analyzed. It was discovered that the die pip height and sheet thickness should be designed synthetically for optimal tensile behavior.
Kinetics Analysis and Simulations on Load Fork Mechanism in Forward-Type Stacker
Authors: Bai Jian Yu , Tong Senlin , Yu Zai He , Zheng Di
Published: November 2010

It is frequently reported by customers that the lower-left and lower-right wheels in the load fork mechanism of a kind of forward-type stacker designed based on static strength analysis are abraded faster than expected. In this paper, we studied by means of kinetics analysis and simulations the forces applied on parts of the fork mechanism. The simulation results show that the maximum values of instantaneous forces during operations are much higher than those derived based static force analysis, and thus explained the reason of the above-mentioned abnormal abrasion. The results also mean that static force analysis is not suitable for part strength design. Instead, one shall adopt kinetics analysis to explore the instantaneous forces in design.
Loading Behaviors of Superposed Aqueduct Affected by Segregating Layer Between PPCBs and Cast-In Situ RCF
Authors: Zhao Shun Bo , Pei Song Wei , Wang Yang Wei , Liang Xi Jian
Published: November 2010

Combined with the structural design of left-shore drainage aqueducts in China South-to-north Water Transfer Project, the structure of cast-in-situ reinforced concrete flume (RCF) with wide and shallow drainage section superposed on longitudinal precast prestressed concrete beams (PPCBs) was drafted. The 3D finite element models were built to study the normal service behaviors of the aqueduct with or without segregating asphalt layer between RCF and PPCBs. The results show that the segregating asphalt layer changes the structural compositions of aqueduct subjecting water loads and results in some effects on loading capacities of the PPCBs and the RCF, such as the larger displacement and tensile stress of PPCBs, the many longitudinal sections of subplate in whole tensile state with larger tensile stresses and the larger vertical tensile stresses at internal surface of sidewall. It provides valuable reference for designing the same kind of aqueduct.
Manufacturing and Green Estimation of Composite Concrete Machine Tool Bed
Authors: Ding Jiang Min , Su Chong
Published: November 2010

This paper presents a new manufacturing technology for machine tool beds, which is composed of high stiffness epoxy concrete structure faces and lower cost steel fiber cement concrete core. After steel fiber cement concrete core is poured, epoxy concrete structure faces are poured. The technology is first applied in manufacturing of CKA6150 CNC lathe bed. Through comparing with cast iron machine tool bed and epoxy concrete machine tool bed, it is estimated by five elements value green estimate theory. The result demonstrates that composite concrete machine tool bed not only has high characteristic and lower energy cost but also meets requirements of green manufacturing.
Mesh Analysis and Realization of Gear Honing with Globoid Honing Worms on Gear Hobbing Machine
Authors: Yu Tao , Dong Ke , Wang Su Yu , Qian Yu Xia
Published: November 2010

Gear honing with globoid honing worms is seldom used because it has no distinct advantages to honing with internal geared honing rings. The paper puts forward a new process to honing gear with globoid honing worms on hobbing machines. First the globoid honing worm is profiled by diamond dressing gears, which has the same geometric parameters with the machined gears. Then the profiled globoid honing worm is used to hone workpieces. Both the profiling process and honing process are implemented on same hobbing machines. Meshing and Tooth contact analysis of globoid honing worm profiling has been considered. Meshing equation of profiling process and equation of globoid honing worm tooth flank after profiling are obtained. Experiment testified that it is an applied process and has many advantages.
Microscopy Photoelasticity for Studying Crazes in Polycarbonate
Authors: Wang Zong Tao , Chen Jin Long , Wang Ri Cao
Published: November 2010

The initiation, propagation and broadening of crazes in polycarbonate were studied with the aid of polarizing microscopy. A loading instrument supplying uniaxial stretch is designed to match polarizing microscopy. With polarizing microscopy, online observations of crazes and stress field can be done simultaneously. Crazes appear in bilateral anteriority of the crack tip and direction of length is perpendicular to the maximum principal stress. Stress on the boarder of the crazing zone is taken as the initiating point of the crazes and length to time of crazes follows exponent law. The initiation, propagation and broadening of crazes is a time-dependent process.
Mixed Natural Neighbor Galerkin Method for 3D Couple-Stress Elasticity
Authors: Wang Kai , Zhou Shen Jie , Nie Zhi Feng
Published: November 2010

Based on the constrained variational principle, the mixed multi-variable natural neighbor Galerkin method for couple-stress elasticity is proposed for three-dimensional problems. The displacements and micro-rotations are taken to be independent nodal degrees of freedom, and the geometrical constraints between them are enforced through Lagrange multipliers. The C0-continuous non-Sibsonain interpolation is used to obtain the discrete equations. The proposed method is tested by the numerical example and the results show that strong size effects are observed when the length of deformation field and the characteristic length of the material are comparable.
Model Analysis of Gilling Machine
Authors: Liu Xiao Gang , Lin Bin , Chen Kai
Published: November 2010

According to model analysis of gilling machine’s hauling box, this paper presents the research on the complex structure’s model analysis. Before the analysis of box, the paper inducted general analysis process, then the box was divided into 8 modules, advanced function MPC and super-element were used to process connection among these modules, the processed model was analyzed by finite-element software Nastran. The result from Nastran include natural frequencies and mode shapes, which are similar to actual work condition. It can be concluded that the process for complex structure is accurate. The result is useful to find the reason of box vibration, and it is also used for optimization design.
Modeling and Simulation of Rural Two-Direction Logistics System Based on Stochastic Petri Nets
Authors: Nie Kai , Lai Ming Yong , Li Wei , Cao Er Bao
Published: November 2010

With the rapid growing of domestic rural market, it is important to develop rural logistics system. Up to now, the general two-direction logistics mode was investigated in order to achieve high efficiency. However the mode was still based on qualitative analysis. This paper proposed a novel rural two-direction logistics system model based on SPN theories. By utilizing the mathematic characteristics of SPN, quantitative parameters of the model were deduced. Finally, compared with the general logistics mode, the proposed logistics mode can improve the logistics efficiency.
Network Failure Model Approach Based on FMEA
Authors: Sun Zhi Hong , Chen Chao , Shan Hong Bo , Zhou Shen Hua
Published: November 2010

Failures or defects in a product will influence its quality a lot. Reducing or eliminating failures and defects in product design phase is an economical way. FMEA and BFA are two kinds of methods. By using them, the product quality and reliability can be improved in the design phase. This paper introduced a new kind of failure analysis method which was developed based on FMEA and BFA. This is a network failure model and analysis method. By using this method, the product quality could be improved and failures could be reduced.
Numerical Simulation of Gas-Particle Two Phase Flow in the Process of Cold Spraying Aluminum Zinc-Base Alloy Powder
Authors: Liu Chuan Shao , Cheng Jiang Wei , Zheng Jian Xin
Published: November 2010

The gas velocity and particle velocity in and out of the nozzle have great influence on the coating effect in the process of cold spray. An axis-symmetric two-dimensional mathematical model was presented to study the flow field in and out of cold spray nozzle, and the effect of different pressure, temperature, spraying distance and particle diameter on gas axial velocity and particle velocity were researched. The simulation results showed that the gas axial velocity and particle velocity increased when the gas pressure and temperature were increased, spray distance had little effect on the flow field in the nozzle, and small diameter particle was more easily accelerated.
Numerical Study of Volute Casing for PIV Measurement by Using FLUENT and ABAQUS Software
Authors: Shao Chun Lei , Gu Bo Qin , Huang Xing Lu
Published: November 2010

Volute casing is one of the important components in centrifugal pumps. The strength and stiffness of the volute casing made of PMMA used for PIV measurement were investigated by fluid-structure interaction (FSI) simulation in consideration of the impeller-volute interaction. The distribution of pressure and shear stress on the inner surface of the volute casing was obtained by FLUENT. Pressure, gravity and shear stress were imposed on the volute casing, and its stress and displacement distributions under different working conditions were obtained using ABAQUS. The results indicate that in comparison with pressure, gravity and shear stress have negligible influence on volute casing deformation. The volute casing is structurally safe under design condition, and its maximum rotational speed can reach to 1690r/min. At this rotational speed, the maximum displacement of the volute casing is 4.6mm, and measurement error caused by refraction is about 0.11%. Furthermore, two methods for improving the volute casing structure were put forward in consideration of light decay as well as the strength and stiffness of the volute casing.
On Matrix Unit Test Plan for Testing of Product Properties
Authors: Xie Zhi Bin , Shi Lei
Published: November 2010

This article applies the method of formulating those test projects affecting product system properties into a matrix with tabular units. According to the complexity of product system, the complexity in test operation, economical cost for a test, etc., the paper proposes the concept of whole matrix unit, intersection matrix unit and particular matrix unit test plan to test the product properties. The result indicates that there are various complicated factors influencing the properties of the product, aggravating the unstability of products system in operation. By utilizing the unit test matrix method, we can obtain experimental data chain for advancing the product reliability design, optimizing product systematical structure. With the existing scientific and technical results, together with the experiment data analysis, mean value and strategy of reliability design, we can promote product reliability and robustness.
On the Methods for Evaluating Product Concept Design
Authors: Xie Zhi Bin , Shi Lei
Published: November 2010

This paper adopts the methods of establish matrix list to concept design evaluation, to study the methods of establishing evaluational criteria and the methods of concept design evaluation. It reveals that it is necessary to evaluate the function, use, man-machine interface, physical structure and control, various technology, assembling handicraft, etc. for concept design evaluation. Concept design process exhibits characteristics of diverging, converging, diverging again, converging again, totally converging. The result shows valuation of concept schemes should be carefully chosen by ways of setting up target product model, matrix of standard decision-making, combining perceptual with reason judgement, schemes being improved and chosen. The evaluation should be carried out in such a way that it should take into account the economical value of the scheme and the promotion of the company’s competitiveness during the entire life cycle of the product.
Optimization and Improvement of the Characteristic of Material Flow of Mixer Truck Assembly Line
Authors: Zhang Guang Guo , Chang Zhi Bin , Zhang Hai Rui
Published: November 2010

In order to achieve the supply of materials on the concrete mixer assembly line timely and accurately, in this paper, the process, production features and actuality of materials supply on the concrete mixer assembly line were analyzed, the stations of the assembly was combined, and function mode of the storage was changed to active distribution. Then the material handling process was optimized using material handling design system. Finally, the effective implementation of material distribution was ensured based on the on-site management.
Output Tracking Control and Synchronization of Continuous Chaotic Systems Using Differential Evolution Algorithm
Authors: Liu Shu Bo , Zhou Shu Min , Hu Li Yong
Published: November 2010

This paper applies differential evolution (DE) algorithm to realize the output tracking control and synchronization of continuous chaotic systems. The output tracking control of single-input single-output (SISO) and multi-input multi-output (MIMO) chaotic system is investigated. Moreover, synchronization of chaotic systems with parameter mismatch or structure difference is also under discussion. Numerical simulations based on the well-known models such as Lorenz and Chen systems are used to illustrate the validity of this theoretical method.
Parameters Design and Motion Analysis of Rolling-Cut Shears
Authors: Sun Deng Yue , Zhao Yang , Peng Jian Dong , Xu Chong Shan , Dong Chun Guang , Wang Jun , Mei Ru Min
Published: November 2010

Based on analysis and transformation of structure and parameters of the introduced 4300mm rolling-cut shears, the paper designed a new rolling-cut shears of large span. The paper gives a comparative study of the up blade locus and parameters between introduced 4300mm rolling-cut shears and new large span rolling-cut shears, to arrive at a conclusion that the new large span rolling-cut shears provide longer cutting steps.
An Analysis of Thermal-Structural Characteristics for Precision Linear Rolling Guide CNC Grinding Machine Tool’s Bed
Authors: Deng Xiao Lei , Fu Jian Zhong , He Yong , Chen Zi Chen , Jiao Hui Feng
Published: November 2010

The bed is a main component of the large precision linear rolling guide CNC grinding machine tool. Its thermal-structure characteristics affect on machine tool’s machining precision and stability directly. In this paper, boundary conditions on the bed of a machine tool factory’s production are analyzed; using FEA method, the bed finite element models for thermal-structure coupling analysis are established and then calculated. By analysis, the simulation of the CNC machine tool operating conditions can effectively obtain the distributions of the bed temperature, thermal deformation and thermal stress; and the results are closed to the true situation.
Precise Impact Drive Mechanism Based on Asymmetrically Clamped Piezoelectric Actuator
Authors: Hua Shun Ming , Cheng Guang Ming , Zhang Zhi Yu , Zeng Ping
Published: November 2010

A new precise linear impact drive mechanism (IDM) was proposed. Differing from the traditional ones, the new IDM can run silently driven by sinusoidal electric voltage. But the actuating force was also inertial impact force generated by a set of asymmetrically clamped cantilever bimorphs. The dynamic characteristics had been experimentally studied on prototype of the IDM. The main results under 50 volt are listed below. The resolution is 27 nm, the maximum velocity 17 mm/s at 35 Hz. And, the maximum loading capacity is not less than 100 g when applied 100 V at 35 Hz.
Precision Forming of Pipe Joint Based on Cold Extrusion Technology
Authors: Xu Shi Min , Huang Hua Gui , Sun Deng Yue
Published: November 2010

The pipe joint is a common part used in automobile, which is in great demand and has certain requirements for dimensions and accuracy. Considering the forming efficiency and material consumption, a precision forming technology based on cold extrusion was presented in this paper. In order to predict the springback during cold extruding, an elastic-plastic finite element model was proposed with the software MSC.MARC, and then the influence of the extruding die on the springback was discussed. With the numerical simulation results, the forming die was optimally designed, and the forming experiment was carried out to verify the simulation results. The feasibility and advantage of the forming technology is proved by experimental results and numerical simulation.
A Mathematical Principle and Application on Design of Planar Six-Bar Mechanism with unto Three-Ordered Intermission at Limit Position(s)
Authors: Wang Hong Xin , Dai Ning
Published: November 2010

A non-iterative design method about high order intermittent mechanisms is presented. The mathematical principle is that a compound function produced by two basic functions, and then one to three order derivatives of the compound function are all zeroes when one order derivative of each basic function is zero at the same moment. The design method is that a combined mechanism is constructed by six bars; the displacement functions of the front four-bar and back four-bar mechanisms are separately built, let one order derivatives of two displacement functions separately be zero at the same moment, and then get geometrical relationships and solution on the intermittent mechanism. A design example shows that this method is simpler and transmission characteristics are better than optimization method.
Product Bionics Form Design Based on Users’ Kansei Image
Authors: Ding Lei , Che Jian Ming , Dong Xiao Fei
Published: November 2010

Based on users’ kansei image and kansei engineering theory, a method on product bionics form design is presented. Firstly, users’ kansei information about product and bionics objects is extracted from semantic differential method, which is the basic standard for determination of the best bionics object. Then by adopting clustering analysis and fuzzy comprehensive evaluation, the product form features and bionics objects’ main features are acquired and combined to design products. Finally, the optimal design is selected through comprehensive evaluation. As an example, case of intelligent electric rice cooker design indecates that this method is valid and practical.
Product Design Strategies and Methods for Automatic Conveying
Authors: Lou Ying Hou , Liu Li Jun , Zhang Xue Chang
Published: November 2010

Conveying is the important part of product processes, which is significantly affected by product structures. Based on the point of conveying, appropriate design will be result in significant improving conveying performance and reducing the degree of automatic conveying difficulty, then equipment would be simplified, and investment reduced. The design strategies for allover include: reducing the parts quantity and variants, corresponding the part geometry with the conveying manner, and parts geometry convenient for checking and identifying. The methods include two situations: design for conveying in the machining process and design for conveying in the assembly process. Applications of parts design for automatic conveying are illustrated.
Research and Application of Macro-Based Tool Library Integration in CATIA Enviroment
Authors: Kong Xian Guang , Chang Jian Tao , Lei Chao
Published: November 2010

In order to implement the integration of tool libraries from CATIA and the tool database, CATIA software is further developed by using macro. A macro-based integration proposal between the two libraries is proposed and the development process is presented. Further the macro command named RefreshCatalog which is used to implement the integration is programmed using VBScript language, and the integration interface is defined using VB6.0. Finally, the integration of the tool libraries is implemented successfully for digital manufacturing. This method can solve data inconformity due to many tool data sources and improve accuracy of designer selecting tool.
An Evaluation Method of the Visual Elements of the NC Machine Operation Panel Based on RBFN
Authors: Hou Xin Ru , Che Jian Ming
Published: November 2010

The Numerical Control (NC) machine has not yet improved its Human Machine Interface (HMI) quality, which has deep influence on the operating efficiency. Besides, the operation panel design is the lack of appropriate standards and evaluation systems. Therefore, this paper establishes an evaluation model of the visual elements of the NC machine operation panel, and it could propose a reasonable and reliable basis of operation panel design after analyzing the existing panels’ interface according to Radial Basis Function Network (RBFN) theory.
Grid-Based Web Information Retrieval Architecture Professional Content-Oriented
Authors: Wei Xian Min
Published: November 2010

By the use of grid computing, cluster systems, XML and other technologies, distributed Web information resources were organized and managed effectively by professional content and region from the logic, to design grid-based Web information retrieval architecture for professional content, to provide one way.for the user efficient access to information resources for professional content.
UML Modeling and .NET Frame Development of Web Application
Authors: Wei Xian Min
Published: November 2010

Through analysis of web application model and UML extended mechanism, to realize modeling of various objects in web application in this paper. Discussing methods of UML modeling and development under .NET frames, and using it in an actual management system of research issue. It proved to get good effect of reducing developing complexity and shortening developing periods.
Design and Analysis of a Novel Tunable Band-Stop Filter Using RF MEMS Technology
Authors: Deng Zhong Liang , Zhang Nai Bo , Ge Yue Tao
Published: November 2010

This paper presents a tunable band-stop filter within frequency ranges of 15-30 GHz, it used a novel method to turn the resonant frequency by micro-electromechanical systems (MEMS) switch and coplanar-waveguide (CPW) structures. The DC voltage is utilized to load RF-MEMS switch as source of the tunable cell’s power. The simulation obtained by HFSS and ADS tool shows that insertion loss is less than 1dB in pass-band and return loss is greater than 10 dB. The center frequency changes from 15.5 GHz to 26 GHz, which has 10.5 GHz adjustable range. The result shows good stop rejection and sharp roll off frequency and the extracted result from the circuit matches simulation result very well in this paper.