bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Study of Vacuum Casting DVD Panel Based on Silicon Mould
Authors: Yang J. , Xiao L. , Zhou Jian Zhong , Huang Shu , Fan J.R. , Dai Y.C.
Published: December 2010

As a new fabrication technique based on rapid prototyping, vacuum casting process can be especially used in the stage of products development. In this paper, a self-designed and made silicone mould was used to study process of vacuum casting panel part. ProCAST software was adopted to analyze the melt flowing behavior and effects of processing parameters. The key vacuum casting parameters, such as mould temperature, melt temperature, degree of vacuum and coefficient of heat transfer, on the effects of the filling rate of polymer melt were emphasized to be numerical studied. The results indicate that mould temperature and coefficient of heat transfer have the most important influence on quality of the formed panel.
The Cutting Simulation of Inconel 718
Authors: Ren Jia Long , Zheng Qing Yu , He Ren , Zhang Chun Yan
Published: December 2010

The chemical composition and properties of nickel-based superalloy Inconel 718 was investigated first. Turning Inconel 718 was simulated by Deform-3D software to figure out main affection factors, and optimal combination of cutting speed, feed rate and cutting depth was introduced. In addition, different cooling and Lubrication methods (heat transfer coefficient f of cooling and tool-chip friction factors) for cutting of Inconel 718 was studied, and a best cooling/lub mode was obtained.
Co-Simulation of Wheel Loader Working Mechanism
Authors: Ning Xiao Bin , Shen Ji Sheng , Meng Bin
Published: December 2010

The purpose of the work is to accurately calculate the forces acting on the working mechanism of wheel loader when excavating granulated material. In order to examine mobile machines movement processes, MSC.ADAMS is used to carry out multi-body system simulation and hydraulics sub-system simulation. Because the flexibility of the component of the working mechanism of wheel loader can not be neglected, ANSYS is used to compute the data describing the behaviour of the flexible component of working mechanism of wheel loader. Based on the Fundamental Earthmoving Equation, this paper describes a methodology and basic formulations of forces between the tool and the material to be moved as well as the internal forces in the pile to be dug from. The method has been implemented in an MSC.ADAMS model of a working mechanism wheel loader. The numerical simulation test on LCM(Linyi Construction Machinery) Wheel Loaders under various position of working equipment will be done to predict the forces acting on the machines during digging cycles.
Causes of Nonconformity of IE Power-Driven Machines and its Solution
Authors: Zhao Ling , Ni Jun Fang , Yang Jing
Published: December 2010

This thesis has applied IE principles and methods of flow chat, case and effect diagram, 5W1H, ESRS, etc., to analyze the problem of high percentage of products sent back for repair of a company’s flow line, and has found its cause. Further more, this thesis has put forward a solution to improve the efficiency and effectiveness of existing operation.
Correlation of Optical Properties and Temperature Distribution in Laser-Induced Thermotherapy of Porcine Liver Tissue
Authors: Qian Ai Ping , Hua Guo Ran , Zhang Hua , Qian Zhi Yu
Published: December 2010

Laser induced thermotherapy (LITT) is a promising local treatment for irresectable liver tumors. For evaluating the effect of laser application in real time and ensuring the optimal effect in LITT, exploration the changes of optical properties and temperature distribution in tissue, and their correlation are indispensable. In vivo measurements of the reduced scattering coefficient (μ’s) and tissue temperature (T) were performed with a functional near infrared spectroscopy (fNIRS) system and a temperature measurement system during LITT. Fresh porcine liver tissue samples in vitro were examined in different laser doses (0.95W, 1.23W, 1.42W) and at a certain heating time (600s). There were the same rising tendencies of the reduced scattering coefficient and temperature during LITT. They increased quickly at the beginning, gradually reached a stable state, and they rose faster when the laser power was greater. When the tissue temperature was below 50°C or above 65°C, there was only a slight increasing of μ’s .When the tissue temperature in the range of 50°C to 65°C, μ’s changed more obviously, and there was a clear linear relationship between μ’s and tissue temperature. The linear equation was obtained for the first time. These results can effectively guide the study of evaluating the effect in real time during LITT.
Quality Prediction of Laser Cladding Based on Evolutionary Neural Network
Authors: Xu Zhao Mei , Wu Hai Bing , Hong Zong Hai
Published: December 2010

Artificial neural networks were introduced in the area of laser cladding forming. The prediction model of surface quality in laser cladding parts, including the width, depth of cladding layer and dilution rate, was proposed based on the improved learned arithmetic. The model combined the global optimization searching performance of the genetic algorithm and localization of the back propagation(BP) neural networks. Five technical parameters were selected to test the reliability of the mode. The simulation and experimental results show that the evolutionary neural network based on genetic algorithm can effectively overcome the problem of falling into local minimum point. This method can get higher accuracy of prediction. It improves the measurement precision with the maximum relative error 2.14% between the predicted content and the real value.
The Presence Research on 6-DOF Tank Driving Simulator
Authors: Cao Qing Hua
Published: December 2010

with computer graphics technology continually improved, visual simulation system development of sports simulators has become the hotspot. The structure and work principle of 6-DOF tank virtual driving simulator are presented, motion simulation of driven equipment are done by developed based on advanced simulation software(MultiGen Creator and OpenGVS SDK), which is combined with the Object-Oriented method. Dynamics model of simulate system is established , object model is disposed and collision detection is briefly analyzed. The immersion of this visual simulation has been confirmed experimentally.
Effect of Meshing Clearance to VIC Internal Mixer
Authors: Wang Chuan Sheng , Li Shan Hu , Bian Hui Guang , Xue Zhuang Zhi
Published: December 2010

VIC mixer was a new type mixing equipment, and both had internal mixer's and open mixer's advantages. Meshing clearance of VIC mixer can be changed in the mixing process at any time by the eccentric bearing. The meshing clearance can be changed at different stages of the mixing process to adjust the different mixing formula and process. Through the experiments we had found that VIC mixer have a good mixing temperature control, cooling efficiency and low peak value in power when the meshing clearance is small. When the meshing clearance is large there is a high feeding speed, energy utilization efficiency and dispersion.
Design & Fabrication of a MEMS Piezoresistive Accelerometer with Beam-Film Combined Structure
Authors: Liu Yan , Zhao Yu Long , Sun Lu
Published: December 2010

In this paper, a MEMS (micro-electro-mechanical system) accelerometer has been developed utilizing piezoresistive sensing elements for vibration measurements in large-scale rotating machineries. The accelerometer consists of highly symmetric beam-film combined structure with 4 p-type piezoresistors diffused on beam surface. The beam and two same films, acting as a whole, give the structure a higher mechanical stiffness making the accelerometer’s nature frequency enhanced. During the chip design, classical vibration and elasticity theories are taken advantaged of to determine the dimensions of the sensor chip based on the requirements of industrial practical application. FEM (finite element method) is also used to investigate the performances of the sensor under acceleration load. The device is fabricated by using bulk micromachining technology, and an n-type, (100) oriented silicon wafer is used as the blank of the chip. The packaged sensor is tested and the experimental results show that the sensor has a sufﬁcient linear response (non-linearity≤0.26%FS) up to 50g with a sensitivity of 1.5mV/g/8V. The resonance frequency of the sensor is about2860Hz, and this allows the usage of the sensor in state monitoring with the necessary bandwidth.
Structure Synthesis of 3-RRS Type Spatial Compliant Parallel Manipulator
Authors: Zhu Da Chang , Meng Li , Jiang Tao
Published: December 2010

Parallel manipulators has been extensively studied by virtues or its high force-to-weight ratio and widely spread applications such as vehicle or flight simulator, a machine tool and the end effector of robot system. However, as each limb includes several rigid joints, assembling error is demanded strictly, especially in precision measurement and micro-electronics. On the other hand, compliant mechanisms take advantage of recoverable deformation to transfer or transform motion, force, or energy and the benefits of compliant mechanisms mainly come from the elimination of traditional rigid joints, but the traditional displacement method reduce the stiffness of spatial compliant parallel manipulators. In this paper, a new approach of structure synthesis of 3-DoF rotational compliant parallel manipulators is proposed. Based on screw theory, the structures of RRS type 3-DoF rotational spatial compliant parallel manipulator are developed. Experiments via ANSYS are conducted to give some validation of the theoretical analysis.
Study on Wire Breakage in WEDM by 3D Technology
Authors: Xu Yong , Guo Xu Hong , Liu Chang
Published: December 2010

Wire electrical discharge machining (WEDM) is a well-established non-conventional material removal process capable of meeting the diverse machining requirements posed by the demanding metal cutting industries. It has been commonly applied for the machining and micro-machining of parts with intricate shapes and varying hardness requiring high profile accuracy and tight dimensional tolerances. But WEDM is a complex machining process controlled by a large number of process parameters such as the pulse duration, discharge frequency, discharge current intensity and wire feed rate. Many authors found that when they machined a workpiece with varying thickness, they couldn’t get a good machining performance although they had set suitable process parameters, because it usually happen wire breakage at the processing. So in recent years, the WEDM’s research and development has explored control strategies of adjusting the variation, such as the power density, gap voltage as machining a workpiece with different thickness. Several authors developed their control system to predict and monitor the cutting process. Although these methods increase the level of machine autonomy, they require a large amount of computation, which slows down the processing speed and undermines the online control performance. Hence this paper developed a new system using Pro/toolkit and Visual C++ based on Wildfire Pro/E 3.0 platform. The system can help operator identify the workpiece with varying thickness or through-hole, change process parameters with the varying thickness automatically and generate G-code transfer to the NC machine finally.
Intelligence Optimization Design Model of Deep Cement-Stirring Pile
Authors: Chen Xiang Yang , Yan Heng Zhen
Published: December 2010

Aiming at the phenomenon of the more conservative design of deep cement stirring pile currently, used optimization design theory such as genetic algorithm and particle swarm optimization, taken the cement consumption as the object function, taken replacement rate, water-cement ratio, pile diameter and pile length as the design variables, composite foundation bearing capacity and settlement as restrictive conditions, the optimal design models are established respectively based on genetic algorithm and particle swarm optimization. Case studies have shown that these two established models are effective. By comparison, the particle swarm optimization model is the more effective one.
Research on the Converse Design of Aluminum Alloy Connecting-Rod Slab Based on Casting-Forging Coordinates Process
Authors: Jiang Yin Fang , He Yi , Lai Yan Ling
Published: December 2010

It is very important that the shape and size of the slab is designed for forging quality in casting-forging coordinate process. The converse design of aluminum alloy connecting-rod slab is investigated. First, the initial structure of the connecting rod slab is designed, then its forging process is simulated by the software DEFORM, modifying and optimizing the initial structure according to the problems in the analysis, and the slab's casting process is simulated. The converse design reduces the blindness in the slab design process, shorts the designed cycle, and ensures the consistency between slab and the final forging better.
Three-Level Supply Chain Coordination with Revenue-Sharing Contract and Rebate-Penalty Contract
Authors: Pang Qing Hua
Published: December 2010

A supply chain is made up of independent entities having independent decision-making abilities, each intent on maximizing his benefits. The coordination of a three-level supply chain made up of one manufacturer, one distributor and one retailer is studied under the random demand. Firstly, the optimal order quantity is determined with the channel coordination of the supply chain; Secondly, the paper designs a combined contract (revenue-sharing contract & rebate-penalty contract, RS-RP contract) to coordinate the supply chain, namely, manufacturer offers distributor a revenue-sharing contract and distributor offers retailer a rebate-penalty contract. The paper validates that RS-RP contract can coordinate the three-level supply chain by choosing reasonable parameters. The reasonable choice of parameters can attain the win-win good among all business members, which will help to improve the decision-making capacity and competive ability of businesses involved in the supply chain, and the sizes of parameters in a reasonable range relate to the bargaining position of a business. Finally, the validity of the RS-RP contract is illustrated by a numerical example.
Analyzing the Modality of Two-Dimensional Photonic Crystal Fiber Optical Micro-Resonators by Equivalent Refractive Index Mode
Authors: Wang Feng , Ren Chang Yu , Ren Dun Liang , Liu Bing Sheng , Han Ren Xue
Published: December 2010

This paper analyzes the modality of two-dimensional photonic crystal micro-resonators by adopting equivalent refractive index mode. In this paper, it controls the optical field distribution only through altering the thickness of light guide layer, while the parameter like resonator structure and crystal lattice arrangement remain stable. It discusses that it would arrive at a satisfactory photon locality while the refractive index of light guide layer material is gallium nitride , the thickness of light guide layer is and its equivalent refractive index is 2.1.This reveals the influence of micro-resonator light guide layer’s thickness towards the modality, providing a preferable pre-estimate method for the actual research of micro-resonators with higher quality.
Technique of Heating Process of Stainless Steel
Authors: Quan Fang Min , Sun Wen Qiang , Dai Lei , Cai Jiu Ju , Zuo Yuan Jie
Published: December 2010

Hot work character of stainless steel is focused on and the technique and operation of heating process of stainless steel are studied in this paper in the aspects of the charging of stainless steel heating furnace, the temperature regulation and control in steel heating process, the detection and control of furnace temperature and heating time, the control of atmosphere and furnace pressure during heating process, and the control of furnace when rolling stopped, etc. And each of them has significant effect on the production of stainless steel.
Preparation and Properties of Polyvinyl Alcohol/Polyvinyl Pyrrolidone Blend Films
Authors: Qu Liang Jun
Published: December 2010

A series of poly(vinyl alcohol) (PVA)/ Poly (vinyl pyrrolidone) (PVP) blend films with different weight ratio of PVA to PVP were prepared by solution-mixing method The morphological structures and characterized of the films were observed via scanning electronic microscopy (SEM), Differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR). DSC measurements showed that there was only one Tg for each blend and the values of Tg varied with the PVA content. This implies that the PVP/PVA blend is at least partially compatible. The formation of the hydrogen bonding between the PVP and PVA was identified by the FTIR spectra.
Research on Embedded Software Testing Data Generation System
Authors: Yin Yong Feng , Liu Bin , Ni Hong Ying
Published: December 2010

Testing data generation system is an important guarantee for the realization of the maintainable, and effective automated testing of embedded software. In this paper, analysis of the characteristics of embedded software testing data is studied firstly. And then, the process of the embedded software testing data generation is put forward. Finally, the design and realization of the ESTDGS (embedded software testing data generation system) are described in detail. Using the layered architecture design, the user layer, function layer and data layer of ESTDGS are separated and the generated testing data is eventually stored using XML (Extensible Markup Language), which can improve the generalization, maintainability and expansibility of the system effectively.
Permutation Algorithm with Simulated Annealing for Laser Antimissile Problem
Authors: Sun Yong , Zhang Mao Rui , Liu Wei Wei , Li He , Zhang Li Na
Published: December 2010

The permutation algorithm with simulated annealing is proposed for the laser antimissile problem. The attacking sequence optimization plays an important role in the real-time laser antimissile problem. When faced with many targets, it is clearly essential for the laser antimissile system to determine the sequence of the attacking targets. In order to maximize attacking targets are destroyed. This paper presents a permutation algorithm based on the simulated annealing method. The permutation algorithm includes of two exchange strategies which are adjacent exchange and symmetric exchange. Finally, taking ten targets as an example, the simulation results show that the proposed algorithm has better solution than that of pure permutation algorithm and this achievement can be used in the real application.
Performance Study of Storage-Type Domestic Electrical Water-Heaters with Wedged Inlet: Unsteady Water Discharge Rate
Authors: Zhang Zhi Jun , Zhang Shi Wei , Xu Cheng Hai
Published: December 2010

The unsteady water discharge rate on performance of storage-type domestic electrical water-heaters with wedged inlet was studied by computer fluid dynamics simulation (CFD). The results were compared with those of conventional design EWHs having the same tank size. The heater performance is characterized the discharge efficiency, extraction efficiency and fraction of heat recoverable. The water draw-off temperature profile of steady and unsteady water discharge rate has nothing difference for wedged inlet structure, both curve was overlapped. The almost the same energy utility efficiency was gotten both steady and unsteady discharge rate for wedged inlet structure. The obviously difference of water draw-off temperature profile was shown for conventional inlet structure. Water draw-off temperature profile of unsteady discharge rate was decreased faster than steady discharge rate. The energy utility efficiency of unsteady discharge rate was also lower than steady discharge rate. The results were shown that the wedged inlet structure heater has excellent performance for energy utility efficiency under unsteady discharge rate.
Channel Selection and Feature Extraction of ECoG-Based Brain-Computer Interface Using Band Power
Authors: Zhao Hai Bin , Liu Chong , Yu Chun Yang , Wang Hong
Published: December 2010

Electrocorticography (ECoG) signals have been proved to be associated with different types of motor imagery and have used in brain-computer interface (BCI) research. This paper studies the channel selection and feature extraction using band powers (BP) for a typical ECoG-based BCI system. The subject images movement of left finger or tongue. Firstly, BP features were used for channel selection, and 11 channels which had distinctive features were selected from 64 channels. Then, the features of ECoG signals were extracted using BP, and the dimension of feature vector was reduced with principal components analysis (PCA). Finally, Fisher linear discriminant analysis (LDA) was used for classification. The results of the experiment showed that this algorithm has got good classification accuracy for the test data set.
Cutting down the Difficulties of SCM Implementation: A Comparison between Iranian and Malaysian Companies
Authors: Manzouri Malihe , Rahman Mohd Nizam Ab. , Arshad Haslina , Ghani Jaharah A.
Published: December 2010

Although management of organizations are faced with a number of problems which come up during implementing SCM projects, intense competition force them to overcome these difficulties on order to be successful in the fierce global market . In Developing countries, such as Iran and Malaysia, this matter is still considered as a major challenge due to facing several troubles for implementing SCM across their organizations. This paper presented several problems which have occurred when SCM were implemented across Iranian and Malaysian organizations and also suggested a proper framework for cutting down the most important of those difficulties. A survey questionnaire was used to gather the data needed and the review of literature leads authors to propose two frameworks. The survey reveals that both Iranian and Malaysian companies suffer from the “lack of information” as a major difficulty in implementing SCM. Framework A and B were suggested for sharing point of sale (POS) data across the SCM to overcome the lack of information across the chain. The findings of this research would give invaluable information to all managements who investigate for the proper method to conquer the SCM problems.
Control of Testing Device Based on FluidSIM-P
Authors: Liu Jian , Lv Yuan Jun
Published: December 2010

Pneumatic control technology of Test Equipment has been introduced which is used to Test product‘s hardness. The structure and working principle of detector is introduced, its pneumatic loop and PLC control loop have been designed and optimized by way of the software of FluidSIM-P which belongs to FESTO in Germany. Now, the detector has gained good effect on detecting a kind of vehicle parts, the simulation result is similar to Actual Use result in factory, The research and application in this method are help for developing new electromechanical equipment.
A Color Error Correction Mode for Digital Camera
Authors: Ye Han Kun
Published: December 2010

Digital camera is the one of the main devices in the computer and multimedia technology and its color management model is the key to guarantee the color consistency in the succedent image production and transfers. The paper presents a color conversion model for digital camera based on polynomial curve generation. First, color rendering principle of digital camera is analyzed. Then digital camera data is pretreated to a unitary field to deduce final model. Third, standard color target is taken for experimental sample and substitutes color blocks in color shade district for complete color space to solve the difficulties of experimental color blocks selecting; Fourth, the model using polynomial curve generation algorithm to correct color error is deduced; Finally, the realization and experiment results show that, compared with some methods which have relatively high accuracy, the algorithm can improve color conversion accuracy and can satisfy the engineering requirement in digital camera color management
Microscopic Phase-Field Simulation of the Order-Disorder Transition of Antiphase Domian Boundary Formed between DO22 Phases
Authors: Zhang Ming Yi , Yang Kun , Chen Zheng
Published: December 2010

The order-disorder transition at antiphase domain boundary (APDB) between DO22 (Ni3V) phases is investigated using the microscopic phase-field model. After the formation of ordered APDB, the order-disorder transition at APDB is happened, and the ordered APDB transforms into a thin disordered phase layer. Accompanied with the enrichment of Ni and Al at the disordered APDB, the second phase L12 nucleates at the order-disorder interface between DO22 phases and grows along the disordered phase layer. The order-disorder transition at the ordered APDB makes the nucleation and growth of the second phase L12 much easier and faster. The disordered phase caused by the order-disorder transition at the APDB can be considered as the transient phase during the precipitation process of L12 phase.
A Novel Smooth Support Vector Regression Based on CHKS Function
Authors: Wu Qing
Published: December 2010

This paper presents a new smooth approach to solve support vector regression (SVR). Based on Karush-Kuhn-Tucker complementary condition in optimization theory, a smooth unconstrained optimization model for SVR is built. Since the objective function of the unconstrained SVR model is non-smooth, we apply the smooth techniques and replace the ε-insensitive loss function by CHKS function. Newton-Armijo algorithm is used to solve the smooth CHKS-SSVR model. Primary numerical results illustrate that our proposed approach improves the regression performance and the learning efficiency.
Calculating Urban Storm Intensity Formula Using Genetic Algorithm
Authors: Xu Li , Shang Tao , Ma Xing Guan , Lian Lei
Published: December 2010

Urban storm intensity formula is one of the basic urban drainage design formulas. The accuracy and precision of the formula will be directly related to urban infrastructure security and economic rationality. The traditional solution method of the storm intensity formula is time-consuming and the accuracy is poor. The accuracy and precision of the current value iteration algorithm are good, but these methods require a continuous and differentiable objective function, if the function is Non-differentiable or without gradient information, these methods will fail. In response to these shortcomings, this paper uses the Genetic Algorithm to solve the storm intensity formula of the Tieling City to provide a reliable method.
Attitude Estimation with Complementary Filter
Authors: Chang Rui Hua , Mu Xiao Dong , Shen Xiao Wei
Published: December 2010

An attitude estimation method is presented for a robot using low-cost solid-state inertial sensors. The attitude estimates are obtained from a complementary filter by combining the measurements from the integration of a tri-axis gyro and an aiding system mechanized using a tri-axis accelerometer and a tri-axis magnetometer. The results show that the estimation error is less than 1 degree compare to the reference attitude. It is a simple, yet effective method for attitude estimation, suitable for real-time implementation on a robot.
High-Speed Acquisition and Processing Method for High Resolution Image of Wheel Set
Authors: Wu Kai Hua , Fan Jian Xin
Published: December 2010

Measurement of wheel set wear was an important step for the safety of train running. High-speed acquisition and processing method for high resolution image of wheel set based on the hardware platform of DSP (digital signal processor) and PC was proposed. High-speed acquisition and processing was completed by PC and DSP unit separately. PC and DSP unit worked in parallel operational mode. Ethernet transport program based on TCP was designed for data exchange. Asynchronous reset pulse generation circuits were designed. High resolution images of wheel set were captured in 500fps and asynchronous reset mode. Resolution of images was 1280*1024. The experimental results showed that this method improved image processing speed effectively.
Kinematic Chain Isomorphism Identification Based on Loop-Code
Authors: Sun Jiang Hong
Published: December 2010

A new method approach is presented to solve isomorphism identification of kinematic chain topology graphs. Kinematic chain topology graphs are depicted with loop-code based on the characteristic of kinematic chain topology graphs. The number of binary links in the limbs of topology graphs is arranged in group according to links with multi points of connection．Although the order of limbs in the groups and the order of links with multi points of connection outside the groups can change, the planar message of topology graphs can not change. Thereby forming loop-code.This representation is straightforward and not affected when drawing modes and labeling ways change in topology graphs．
Prediction for Relative Dynamic Elastic Modulus of PVA-ECC under Freezing and Thawing Cycles
Authors: Hou Hui Fang , Liu Shu Guang , Yan Chang Wang , Bai Jian Wen
Published: December 2010

This study focuses on the relative dynamic elastic modulus of the polyvinyl alcohol fiber reinforced cementitious composite (PVA-ECC) after three hundred freeze-thaw cycles. The Artificial Neural Network of freeze-thaw cycles prediction was finally established through data analysis with the help of BP artificial neural network, calculation method optimization and sample training, many times’ trails of the hidden layer and every hidden unit, and the optimal selection of the training function. The results show that there is a small relative error between the predicted value and the actual one of the specimen of the relative dynamic elastic modulus of the PVA-ECC, and the established artificial neural network model bears a higher prediction precision.
Study on Regional Traffic Control Optimization Based on State Analysis
Authors: Zhang Liang Zhi , Jia Lei , He Mi Nai
Published: December 2010

The aim of regional traffic control optimization is to find the optimal design parameters while thinking over the route choice of users. This problem can be formulated as a bi-level programming program. In the program, signal control scheme and user equilibrium traffic assignment are optimized in the upper and lower level respectively. The solution procedure developed with the genetic algorithm has been tested with an example of factual road network.Numerical experiment verified the proposed model is quite promising for use in design of regional signal control.
On the Evaluation Method of Wavelet Analysis for Surface Roughness
Authors: Huang Mei Fa , Cheng Xiong , Kuang Bing , Huang Jiang Tai
Published: December 2010

The quality of workpiece is influenced by the surface roughness. However, the assessment of parameters of surface roughness is not researched intensively in the new generation GPS standards system. This paper presents a method to assess parameters of surface roughness. The methodology adopts wavelet analysis to construct the model of surface topography and uses the mallat algorithm to separate roughness profile from surface topography. The assessment results of surface profile are calculated according to the standard ISO 4287:1997. The experimental results show that the method not only avoids simplicity the assessment of parameters, but also decreases the number of productions of mis-acceptance and mis-rejection.
Testing Study on Wear Mechanism of Fluororubber by 45# Steel under Different Speed in Oil Medium
Authors: Sun Hao , Wang Shi Jie
Published: December 2010

Fluororubber is an important material used for the stator of progressing cavity pump, which works under high temperature and high pressure conditions transferring oil of high viscosity. With sand-content oil as medium, the wear mechanisms of fluororubber by 45# steel under different speed and different initial temperature were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction (COF) were measured continuously for 10800s. The varying law of COF was summed up and the wear mechanism reflected was concluded.
Research of Real-Time Monitoring Technology for Progressing Cavity Pumping Operation
Authors: Wang Shi Jie , Sun Hao
Published: December 2010

Progressing cavity pumping operation is one of the five main artificial lift technologies in current oil industry. It has been successfully applied to complex well conditions such as viscous crude oil, high sand-content oil and the offshore platform. To protect the key components effectively and achieve the longest economical service life of the pumping system, it is necessary to establish the flow rate monitoring system. Considering the rate of revolution affecting factors, over-current protection of motor during start-up and production-extraction balancing relationship, 3-grade control tactics was put forward. Also, some technical problems in the monitoring platform such as the collection of intake pressure and down-hole temperature signal, selection of hardware and web-based communication were introduced in detail.
Product Lifecycle Oriented Quality Management System for Individualized Customization
Authors: Sun Xue Yan , Jiang Xing Yu , Wang Shi Jie , Jin Jia Qi
Published: December 2010

To cope with the challenges of traditional quality management system applied in individualized customization, product lifecycle oriented quality management system model for individualized customization, and corresponding functional modules and framework were all put forward. This mode dealt mainly with constructing and running product lifecycle oriented quality management system for individualized customization, furthermore, some of key enabling technologies were studied in detail, including collaborative quality design based on CSCW, dynamic process quality control, quality evaluation oriented to product lifecycle. The corresponding prototype system is developed, which was introduced to demonstrate the rationality and validity of the method as an example of some Heavy Machinery Ltd. It provided an effective method with enterprise implementing individualized customization.
Rheological Investigation of ZK60 Magnesium Alloy Feedstock for Metal Injection Moulding Using Palm Stearin Based Binder System
Authors: Harun Mohd Ruzi , Muhamad N. , Sulong Abu Bakar , Mohamad Nor Nor Hafiez , Ibrahim Mohd Halim Irwan
Published: December 2010

This paper investigates the characteristic important to metal injection moulding (MIM) process via rheological behavior of MIM feedstock. A gas atomized spherical ZK60 magnesium (Mg) alloy powder and the binder of 60wt.% palm stearin (PS) + 40wt.% low density polyethylene (LDPE) were used in this investigation. Prior to mixing process, critical powder volume percentage (CPVP) was determined and subsequently four different feedstocks with powder loading of 62, 64, 66 and 68vol.% were prepared. The properties of the feedstocks were then analyzed rheologically. Here, the flow behavior index n, the flow activation energy E and the mold ability index αSTV of the Mg alloy MIM feedstocks were determined. Results show that feedstock with 64% powder loading has the best rheological properties and therefore it is considered to be the best for the injection moulding process.
Development of Tool Electrode High Frequency Vibration Assisted Micro-Hole EDM Machine for Industry Environment
Authors: Xu Ming Gang , Luo Xue Ke , Li Yong
Published: December 2010

A new tool electrode high frequency vibration assisted micro-hole EDM machine tool aimed to resolve the problem of machine large quantities micro holes in industry was designed. The machine is mainly composed of main body, electrical control module and assistant mechanisms etc. And drawn tungsten wire was used as the micro tool electrode. A series of experiments were carried out using the micro-hole EDM machine.
Flow Behavior Characteristic for Injection Process Using Nano-Yttria Stabilized Zirconia for Micro Metal Injection Molding (µMIM)
Authors: Foudzi Farhana Mohd , Muhamad Norhamidi , Sulong Abu Bakar , Zakaria Hafizawati
Published: December 2010

Micro metal injection molding (µMIM) prior to conventional plastic injection molding (PIM) has become widely demanding due to its smaller size, more complex geometric surface and time consuming on its product. Metal and ceramic in powder form of various sizes up to µm is mixed with binder system to produce products that meet the requirements. Nano size yttria stabilized zirconia (YSZ) with average particle size of 25nm, was tested both physically and mechanically for its properties before mixing and injection process using several testing such as Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), pycnometer density, critical powder volume percentage (CPVP) and rheology respectively. Grain shape for YSZ particle is near spherical with the diameter range between 21.2 – 33.5nm while the CPVP shows the highest powder loading was 41.4%. Binder system of 70% palm stearin and 30% polypropylene (PP) was then mixed with YSZ at 37%, 38% and 39% by using internal mixer with roller blade type. By using CPVP of 41.4% as the guideline, mixing was done beyond the critical point until it is capable of becoming the dough mixture and was found that 43% powder loading is the highest loading it can achieved. This dough form of every mixture of powder loading was crushed to obtain pellet size as the feedstock. Rheology test was carried out for each powder loading at 180oC, 190oC and 200oC with the load increasing from 10N to 20N to determine the plastic behavior and best relationship between viscosity (Pa.s) and shear rate (1/s). Dilatant flow behavior for all the powder loadings and smooth data distribution during testing at 180oC was observed respectively. Critical parameters involving in injection process such as mold temperature (oC), melt temperature (oC), pressure (bar) and time (s) was manipulated for every powder loading to obtain the best result with no defects such as shot and flashing. Each critical parameter increased gradually as the powder loading (%) increased. Debinding and sintering process will be carried out to determine the strength and toughness by using micro hardness and micro tensile test respectively.
Design of Rolling Tool System for Fin Forming Machine
Authors: Wang Yan Tao
Published: December 2010

The method to develop the rolling tool system for the fin forming machine is presented in this paper. The principle of the waveform shaping is analyzed and different schemes of the rolling tool are built and discussed. After the selected of the most optimization of the rolling tool scheme, the parameter design of the rolling tool is calculated. Correspondingly, the other auxiliary components of the fin forming machine are proposed. In the end, the whole assembly of the rolling toll system is discussed. The development of the fin forming machine used this rolling tool system will achieve a variety of specification fin products.
Integrated Teaching Reform of Hydraulic Structure Major Using CDIO
Authors: Wang Yin Hua , Wu Wan Ling , Wang Yu Qiang , Xu Chang
Published: December 2010

Practice teaching is an important educational task for hydropower construction engineering major in vocational and technical colleges. Guided by Conceive Design Implement Operate (CDIO), students could get hands-on experience from practical projects under experiential learning environments, and then develop engineering capacity and project literacy. Due to the introduction of CDIO, the original unrelated and dispersed curriculums became comprehensive and continuous engineering design trainings in the form of projects. Students were divided into groups. The ability of thinking and problems solving for practical engineering could be easily cultured by a collection of comprehensive group trainings, such as program discussions, designs, and drawings.
Study on the Intelligent Fault Diagnostic Flat for the Shipboard Equipment Based on the Virtual Instrument and Wavelet Neural Network
Authors: Zhang Ming Hu , Wang De Hu , Lv Shi Jun , Song Jian , Huang Yi
Published: December 2010

Virtual instrument (VI) is an integration of the most recent PC technology, advanced testing technique and strong software package, and the VI system development is the modern technology trend in the automatic test and fault diagnosis domain, etc. Firstly, the intelligent fault diagnostic flat for the shipboard equipment is developed, applied the VI technology, wavelet neural network and database, in order to update entirely the testing means. Secondly, the modularization and universalization are proposed in its database-based design concept, realized the software and hardware design, and it broke through conventional check diagnosis patterns, resolved difficult to overcome problems brought on adopting existing conventional fashions examined and repaired the shipboard equipment, greatly shortened the maintenance cycle. Lastly, it was proved by experiments that the flat system has merits, such as high testing precision, strong flexibility and reliability and extensibility, and economical practicability. Also it can reduce the application development cycle and cost, and is of some values for developing the other fault diagnostic instrument.
Identification of Frequency Response Function of Shaking Table with a New Estimator
Authors: Chen Jian Qiu , Tan Ping
Published: December 2010

Shaking table is a nonlinear system, which is a more nonlinear system with payload. System can be usually as linear system nearby working point in control strategy. 1 H -estimator or 2 H -estimator is used for identifying the Frequency Response Function (FRF) of the system. 1 H -estimator is a lower-estimator and 2 H -estimator is an over-estimator, both have large estimating errors. In this paper, a new estimator, m H -estimator, is used for the identification of the shaking table system’s FRF, and whose parameters are estimated by differential evolution (DE) which makes m H closed to the true FRF H . This control strategy can reduce the steps of iterative learning control (ILC) of shaking table system, and the affection of payload characteristic.
High Speed Noncontact Displacement Measuring System Using FPGA
Authors: Li Xing Guang , Li Gui Ying , Zhao Shuang
Published: December 2010

According to optical triangle theory, by detecting the position of reflection light spot on line array CCD. The pels signal is transformed into data flow by a high speed ADC for processing with the circuit composed of FPGA. The system can calculate the relative displacement between the reference point and the objects detected. The system has 50MHz sampling rate and USB2.0 bus, so it also can be applied in other information acquisition fields.
Profile Error Synthetic Analysis of One-Side Milling of the Inner Engaged Globoidal Cam
Authors: Jin Lian , Kuang Zheng , Hu Zi Hua , Tang Liang , Yuan Ju Long
Published: December 2010

After making a detailed analysis about the one-side machining theory, based on the homogeneous coordinate transformation and the conjugate meshing theory of spatial mechanisms, applying Newton’s iteration, this paper realizes the synthetic analysis of the one-side milling profile error about the inner engaged globoidal cam for the potential cutter error and installation inaccuracy. A computer simulation example is presented, and the results can effectively disclosure and predict the law of influence of the various errors on the cam profile normal error. Consequently, a scientific proof has been supplied to improve the precision and quality of the one-side machining of the inner engaged globoidal cam.
Modeling of Servo 4-Stage Gear Transmission System and Influence Analysis on Resonance Frequency
Authors: Yang Zheng , Shang Jian Zhong , Luo Zi Rong , Gao Fu Dong , Cheng Chen
Published: December 2010

This paper brings a method to instruct the structure design for servo gear transmission system via studying the resonance frequency characteristics of system while the structural parameters are changed. With the example of servo 4-stage gear transmission system. first, the dynamic mathematic model and simulation model in MatLab/Simulink are built, and the resonance frequency characteristics are analyzed via cosine sweep analysis. Finally, different structural parameters’ influence on resonance frequency is discussed in detail and sensitive parameters are pointed out.
Reliability Test Design for Five-Axis Machining Center
Authors: Zhang Xiang Po , Yu Nai Hui , Shang Jian Zhong , Wang Zhuo
Published: December 2010

Reliability test is the most effective way to achieve the data needed in machining center’s reliability design and assessment, and also a compulsory technological way to improve the reliability of the machining center. For the purposes of evaluating and improving the reliability level of machining center effectively, a laboratory reliability test for five-axis machining center was designed. This test method designed in this paper has the characteristics of high pertinence and easily realized in engineering, and it can be generalized as a reliability test criterion for five-axis machining center.
Study on System of 3D Virtual NC Machining Environment
Authors: Kong Fan Xin , Zuo Jian Min , Hao Hong Yan , Zhou Bo Rong
Published: December 2010

This paper, combining with actual machining situation of CNC milling , put forward system architecture based 3D（three-dimensional）visual virtual machining environment. Based on key technologies including geometric modeling ，behavioral modeling technology and NC code analysis of simulation system of three-dimensional virtual CNC milling，it developed simulation system of CNC milling that can realize the function of operation and programming.
The Evaluation Method for Product Form Attractiveness Based on Miryoku Engineering
Authors: Dong Wei
Published: December 2010

In this paper, an evaluation method for product form attractiveness based on Miryoku Engineering was proposed. First is to identify the product form attractive factors. Then Conjoint Analysis was employed to obtain product form attractiveness to consumers. This method can help designers to grasp consumers’ preferences to product form attractiveness and specify design objectives. The application on electric kettle was provided to demonstrate the effectiveness of the proposed evaluation method.
Hand-Eye Calibration of Machine Vision System for Manipulator
Authors: Ge Dong Yuan , Yao Xi Fan , Xiang Wen Jiang
Published: December 2010

In the eye-in-hand system of manipulator, whose transformation relation of wrist frame with respect to camera frame can not be obtained immediately due to the camera frame’s origin at the optical center, inside the camera. Because there are two freedom degrees in the solution to the basic equation of hand-eye calibration, to find a unique solution for them in experiment, we move the manipulator three times, thus such three equations can be obtained, and the relative position and orientation of camera frame with respect to wrist frame can be achieved, and the eye-in-hand calibration is achieved.
New Exploration of the Nature of Packet Matensite
Authors: Ma Yue Xin , Wang Long , Yang Shao Kui , Liu Yue Jun , Tan Yu Hua
Published: December 2010

Many controversial data and contradictions about basic feature and behaviour of martensite were exhibited in available investigations. New opinions for following questions, such as the nature and kind of packet martensite, the stereo morphology of lath and plate martensite, the habit plane of martensite etc., have been proposed by the authors through the observation of thirteen steels under optical microscope, scanning electron microscope. It was found that packet M in iron-base alloys can should be divided three kinds: packet thin sheet M, (111) packet plate M and (225) packet plate M