bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Automatic Control System of Suspended Access Platform Based on PIC16F877A
Authors: Jiang Xue Chen , Sun Jia , Zhang Ke , Guo Hua , Wu Yu Hou
Published: December 2010

The design of automatic control system mounted on the suspended access platform is put forward. With advantages of the microcontroller in real time data acquisition and data processing, PIC16F877A is applied as controller of the system. Angle sensor and pull sensor are applied as measuring elements of the system. The control system can implement functions of automatic leveling and overload protection. The new automatic control device is tested to be easy to operate and high reliability. It completely meets requirements and suits for multi-series specifications suspended access platforms, worth to be widely extended in applications.
Improved Development on Electrode Formula of D608
Authors: Lu Hua Qiang , Fu Ge Yan , Shi Shi Hong , Li Long
Published: December 2010

Electrode D608 is prone to pore, slag eye, sonim, crack and misrun etc. in the Welding process , through improving formula of electrode D608 to enhance its welding performance. Joining a small amount of tungsten, ferromolybdenum, ferroboron and sepiolite etc materials in electrode formula of D608, wiping off graphite, white clay and aluminite powder, also reducing usage amount of ferrosilicon, obtaining a bran-new electrode formula X-D608, which also make an analysis of welding performance and welding organization for new electrode in grey cast iron, finding that welding seam structure of new formula electrode became thinner, pores, cracks and other defects significantly reduced.
A Method of Indoor Ambulatory Monitoring for Psycho-Physiological and Behavioral Activity Assessment
Authors: Ohtaki Yasuaki , Papastefanou Georgios
Published: December 2010

This study proposes a method for indoor activity assessment by means of continuous and quantitative measure of personal physical and mental activity, basing on contents and contexture of location and behaviors. This article focused on development of an integrated wearable instrument which is capable of both indoor movements tracking and monitoring of concurrent psycho-physiologically indicated mental activity. A body-mounted inertial instrument utilizing accelerometers, gyros, and a bolometer was designed to obtain feature of three-dimensional indoor locomotive behaviors. Skin resistance change by electro-dermal activity was measured as an index of emotional arousal. Potential usefulness for assessing indoor pedestrian was demonstrated in a multi-story building.
Design of an Active Phase Conjugation Circuit for Retrodirective Array in UHF Band
Authors: Sun Xia Li , Zhang Qing , Yan Shu
Published: December 2010

An active phase conjugation circuit of retrodirective array which can be used in UHF band (890-960MHz) has been designed. Circuit of the retrodirective array consists of filters, mixers, dividers and other microwave devices. In this paper, microstrip filters and mixers are primarily designed. Divided matching circuit will be designed appropriate on the basis of the antenna element. Filters consist of microstrip coupled lines to conform with microstrip antenna arrays; to suppress the effect of RF input signals to output transmitted signals, selecting the image-rejection mixers. Simulation results of ADS show that all of the designed active devices display good performances.
Research and Design of Control System for a 3-DOF Hybrid Robot
Authors: Li Ju , Shen Hui Ping , Jiang Y.X. , Deng Jia Ming , Liu Shan Shu , Ding Lei , Wang Wei
Published: December 2010

This paper studied a novel 3-DOF hybrid robot, and invented a new hybrid structure which was composed of 2-DOF parallel structure and 1-DOF serial structure. The structure of this mechanism was simple, stiffness and positioning accuracy was high. The control system based on ARM micro-controller was a step motor open-loop control system, which features compact and low cost while the control accuracy can be guaranteed. In this paper, the body composition of the robot was described, and its inverse kinematics were derived and further simplified. Hardware and software of the motion control system was designed in detail and experimented through prototype.
Identification of Inertial Parameters of Heavy Truck Powertrains
Authors: Wang Feng Yuan , Huang De Hui , Li Sheng
Published: December 2010

Based on the quality of line frequency response function and the principle of rigid body micro-vibration, a technique was proposed to verify the experimental accuracy for the heavy truck powertrain by using rigid body inertia tensor transformation and additive theory. The measurement of inertial parameters of a heavy truck powertrain was carried out by hammer method. The total least square processing theory was proposed to process the experimental data. The experimental results showed satisfactory accuracy and reliability.
Synthesis and Activity Determination of Angiotensin Converting Enzyme Inhibitors Derived from αs1-Casein Protein
Authors: Huang Ming Yu , Lv Jing Jing , Ni Hong Jun , Zhu Yu , Zhang Fu Bao
Published: December 2010

A lot of peptides were synthesized on the basis of the sequence of αs1-casein. These tri-peptides with the characteristics of low toxicity and high biological activity will be applied to screen a new type of antihypertensive drug. Angiotensin-converting enzyme inhibitors (ACEI) with the better biological activity were screened and their structure-activity relationship was studied. The method of Fmoc solid-phase synthesis had been used to synthesize tri-peptides, and the principle, species, steps of which had been introduced respectively. HPLC assay was applied to screen the activity of ACEI by detecting the concentrate of hippuric acid, which can correspond with the inhibitory activity of tri-peptides. The results showed that the tri-peptides containing hydrophobic amino acid or praline had higher inhibition activity, and the same to the one that containing an aromatic amino acid in N-terminal.
Surface Roughness Prediction of Engineering Ceramics Electro-Spark Machining Based on Rough Set Neural Network
Authors: Li Xue , Wang He , Chen Shu Fen
Published: December 2010

To solve the problem of difficulty in establishing the mathematical model between process parameters and surface quality in the process of engineering ceramics electro-spark machining, a neural network relational model based on rough set theory is presented. By processing attribute reduction from data sample utilizing rough set theory, defects like bulkiness of neural network structure and difficult convergence etc are aovided when input dimensions is high. A prediction model that a surface roughness varies in accordance with processing parameters in application of well structured neural network rough set is established. Study result shows that utilizing this model can precisely predict surface roughness under the given conditions with little error which proves the reliability of this model.
A Novel Current Detection Technology for a Permanent-Magnet Brushless DC Motor
Authors: Sheng Zhan Shi , Liang Jun , Jing Liang , Zhang Dong Hua
Published: December 2010

A novel technique for power electronic switch current detection is introduced in this paper, in which the current-sensor is replaced by electronics circuit. According to the principle that the magnitude of the switch current is proportional to its turned-on voltage drop, the proposed technique utilizes the method of grasping the turned-on voltage drop of the MOSFET to reproduce its current waveform. The appearances of voltage drop of the MOSFET are analyzed and the current reconstruction principles are introduced. Experimental results are given to validate the proposed technique. It has the characteristics of simplicity and inexpensiveness and is worthy of adoption.
Adaptive Decoupling Design of Constant Temperature and Humidity Control System Based on GPC and Multi-Model Control
Authors: Zhang Rong Biao , Huang Xian Lin , Wang Li Hong , Guo Jing Jing
Published: December 2010

In view of characteristics of large time delay, multi-interference and strong coupling in temperature and humidity control system, an adaptive decoupling strategy based on generalized predictive control (GPC) and multi-model control is proposed in this paper. The proposed strategy mainly contains muti-model control, GPC decoupling control and adaptive algorithm. In multi-model control, multi-model sets are established to prevent the model mismatch in different working conditions. Meanwhile, this paper designs adaptive dynamic decoupling algorithms based on the principle of GPC. In actual experiments, temperature and humidity achieve precision of ±0.2°C and ±0.5% respectively.
Rao-Blackwellized Particle Filtering for Mobility Positioning in Mixed Sight Conditions
Authors: Hu Hong Mei
Published: December 2010

Mixed sigh conditions include line-of-sight/non-line-of-sight (LOS/ NLOS) conditions, which have adverse impact on the precision for mobility positioning. A first-order Markov model is employed to describe the dynamic transition of sight conditions, which is hidden in measured data. A Rao-Blackwellized Particle filter (RBPF) is proposed to jointly estimate mobile state and the hidden sight state based on the measurement. Simulation results show the effectiveness of the method.
Control Lorenz System with Vibration Estimation with Averaging Method
Authors: Zhou Chun
Published: December 2010

The vibrational control theory stems from the well-known of stabilization of the upper unstable equilibrium position of the inverted pendulum having suspension point vibration along the vertical line with amplitude as small as desired and a frequency reason high. Chaotic phenomena have been found in many nonlinear systems including continuous time and discrete time. The chaotic systems are characterized by their extreme sensitivity to initial conditions, nonperiodic and boundary. The trajectories start even from close initial states will diverge from each other at an exponential rate as time goes. The vibrational control method was applied to Lorenz system. The effect of the control can be estimated with the APAZ method. It was showed that vibrational control brought the controlled Lorenz system to stable equilibrium with appropriate parameters. Numerical simulation demonstrated validity of the proposed method.
Transistor Compensation Technology of Pressure Sensor Sensitivity Temperature Coefficient
Authors: Wang Quan , Zhang Jin , Hu Ran , Sun Guo Qiang
Published: December 2010

This paper presents the principles of the transistor compensation technology of temperature coefficient of sensitivity (TCS) of pressure sensor. A quantitative compensation formula is demonstrated in mathematics. By experiments, the absolute value of the compensated TCS is easy to be 10×10－6/°C～100 ×10－6/°C with individual adjustment and calibration of each device’s temperature compensation. The feasibility and practicability of this technology are tested. The disadvantages are discussed after the research of the experimental data, while the improvement methods are also given in the designing period. This technology exhibits the great potential practical value. These applications are promoted in the volume production. The operating performances of these pressure sensors using this technology are studied and proved they are reliable and stable.
Simulation and Optimization of Job Shop Scheduling for Dry Transformers Based on eM-Plant
Authors: Ni Jun Fang , Tang Ke Zhen
Published: December 2010

The model of job shop scheduling to fabricate dry transformers is constructed by Object-oriented Petri Net (OPN) in this paper, the essential attributes and ways of all object classes are defined to judge if there is a deadlock in the system. The overall OPN model of job shop scheduling is built according to relations of event actions in the manufacturing system. Product processes in the job shop is simulated by eM-Plant software to reconstruct and optimize the manufacturing system at last.
Study of Tooth Profile Design with Asymmetric Double Circular Arc Gears for Pumps
Authors: Liu Yuan Wei , Fan Jia
Published: December 2010

While transmission theory of asymmetric double circular arc gears is created,the design parameters of asymmetric double circular arc gears are also studied theoretically in this paper. A set of equations for determining asymmetric double circular arc tooth profile are deduced. The theoretical foundation will be laid for designing the gear pumps and reduction boxes in the future productively.
Surface Heat Transfer Coefficient’s Calculation of W9Mo3Cr4V during Cryogenic Treatment
Authors: Liu Zi Ran , Ren Cai Xia , Yan Xian Guo
Published: December 2010

In the process of the finite element analogy of the Cryogenic Treatment of the high speed steel cutter with respect to the material of W9Mo3Cr4V, the surface heat transfer coefficient is a crucial parameter. In order to get this parameter, this paper employed the method of inverse heat conduction to process the temperature curve generated through the cryogenic treatment of the tested work piece with the material of W9Mo0Cr4V, thereby obtaining the surface heat transfer coefficient of the tested work piece. This coefficient can be considered the surface heat transfer coefficient of cryogenic treatment of the cutter with the same material. The principle of the inverse heat conduction is as follows: firstly, according to the boundary condition and the initial value in the tri-dimensional space, the equation of the sensitivity coefficient and the temperature field can be deduced. Second, the coupling of two equations is carried out, and the heat flux density is calculated based on above result. The heat flux density will be revise to get the reasonable value . Lastly, the surface heat transfer coefficient can be obtained by the heat flux density. In this paper, all the work is automatically accomplished with the aid of FEPG soft ware and Visual C++ programmable language.
Experimental Study on Warping Height of PA12/HDPE Specimen by Selective Laser Sintering
Authors: Ren Nai Fei , Wang Pan , Luo Yan , Wu Hui Juan
Published: December 2010

The dimensional accuracy and mechanics properties of parts made by Selective Laser Sintering depend greatly on the sintering process parameters. The influence of process parameters on warping weight of parts sintered by blends of polyamide (PA12) and high density polyethylene (HDPE) was studied. The relationship between the process parameters and the warping height was presented. The surface morphology of the part and uniformity of powder mixed were analyzed by SEM. The optimum parameters of minimum warping height were obtained: preheat temperature 110°C, scan speed 300mm/s, laser power 21W, thickness of single layer 0.2mm.
Experiment Research on Improving the Fatigue Life of 12Cr2Ni4A Welding Joints by Laser Shock Processing
Authors: Wang Cheng , Zhou L.C. , He Q. , An Z.F. , Lu J.Z.
Published: December 2010

Laser Shock Processing (LSP) has become an advanced method for improving the mechanical properties such as hardness, residual stress and fatigue life. Nanosecond laser pulses of extreme intensity generated subsequent plasma. The rapid expansion of high pressure plasma creates a shock wave that propagates through the material, creating dislocations and inducing plastic deformation. Thus it can effectively eliminate welding residual tensile stress and improve fatigue capability of welding joints. The two kinds of welding experiment of 12Cr2Ni4A were designed to prove it. The experimental results showed that LSP has abroad application prospects in post-processing welding field.
Micro Structures and Mechanical Characters of Hydrogenated Nanocrystalline Silicon Thin Films with Different Doped Proportions
Authors: Ding Jian Ning , Fan Hui Juan , Guo Li Qiang , Fan Zhen , Cheng Guang Gui , Shen Si Guo , Pu Hua Sheng
Published: December 2010

Hydrogenated nanocrystalline silicon (nc-Si:H) ﬁlms were deposited on glass substrates using Radio frequency plasma-enhanced chemical vapor deposition(RF-PECVD)from a B2H6/SiH4/H2 gas mixtures. In this paper, we mainly changed the Borane-Silane flow rate ratio (β), while other parameters were kept constant. Raman spectrum and X-ray diffraction were employed to investigate the micro-structure of the films, and the indentations were used to measure the mechanical characters (the Young’s modulus (E) and hardness (H)). The Raman spectrum showed that, withβincreasing the crystalline fraction decreased, which indicated that more boron doped might not be propitious to the formation of crystalline of the thin films. XRD spectrum revealed that the films have a remarkably preferential orientation. The analysis of the Young’s modulus and hardness by TriboIndenter nano system suggested that the increase inβhad concernful effects in the decrease of E and H values, so we can control the mechanical characters of the thin films by means of changing the doped concentrations. In view of these results, it may be concluded that the use of lowβconditions might lead to growth of nc-Si:H ﬁlms with high crystallinity, and as well high Young’s modulus and hardness.
Integrated Approaches for Generating Principle and Structural Innovation Concepts of Mechanical Products
Authors: Han Ze Guang , Hao Rui Qin , Zheng Xi Jian
Published: December 2010

A large number of decisions are made during the stage of concept design which is characterized by a lack of complete information.While existing computer aided design(CAD) systems for supporting the structure design have little impact at the conceptual design stage.To support the top-down design process,reduce the time of mechanical product design and ensure their innovation, a novel approach of the principle and structural conceptual design for mechanical products was presented in this paper.Firstly,the state equation,which is used to solve the principle concept,was established,and the gene-sign expression and corresponding algebra of the principle concept was also provided. Secondly, the structural state equation composing a machine was established,the spatial configuration model of function and assembly symbol was also proposed using in structural conceptual design.Finally,Based on the approach,corresponding software prototype was developed,a lot of concepts was generated successfully using this software prototype.The difficult problem merging the conceptual design and the detailed design is solved,thus it is a practical top-down design.
Research on Tool Post Angle of Standard Hob Cutting Modified Gear
Authors: Qian Zhi Liang , Chen Yan
Published: December 2010

In view of the adjustment of tool post angle during hobbing modified spur gear, the basic worm helicoids of hob is generated according to national standards. The model of the hobbing is established according to space engagement theory and actual processing conditions. The formulae for the transversal shape of workpiece gear and its tooth-profile and tooth-thickness deviations are derived. Several calculating examples are given. The results show that there are different zero (tooth-profile and tooth-thickness) deviation tool post angle for different modification coefficient. Finally, the approximate formulae for zero deviation tool post angles are given to be easy to use in engineering. The tool post angle adjusted according to the method can ensure precision of workpiece gear.
Research on the Profile Error Evaluation and Visualization of Free-Form Surface
Authors: Su Na , Guo Hui
Published: December 2010

To solve the problem of evaluating profile error of surface, theoretical surface was built by interpolating design points at the method of bicubic Non-Uniform Rational B-Spline(NURBS). Measuring points were gained by laser measurement, and the mathematical model was built for computing the error. The particle swarm optimization (PSO) was applied to compute the minimum distance from measuring points to design surface, which can evaluate profile error of surface accurately. At the same time, MATLAB software was used to realize visualization of profile error evaluation of free-form surface. Experiments show that the proposed optimization can obtain precise result, the method is feasible, visualization makes geometric feature observed more intuitive and there is important practical significance.
Residual Stress Determination by X-Ray Diffraction with Stress of Two Directions Analysis Method
Authors: Feng Ai Xin , Sun Huai Yang , Cao Yu Peng , Xu Chuan Chao , Ni Gui Fen , Wang Jun Wei , Zhou Peng Chen
Published: December 2010

Residual stress determination by X-ray diffraction is theoretically analyzed. Using stress of two directions analysis method, the magnitude and direction of the principal stress which is induced by laser shocked wave can be calculated. The results indicate that the calculated value consists with that of the experimental data, which shows that the surface stresses state comprehensively. Meanwhile, the relationship between the principle stress and single stress with different energies are analyzed.
Rolling Block Construction Method of Cylindrical FDSO Based on Semi-Submersible Barge
Authors: Ni Tao , Wang Yun , Li Bing Nan , Song Jie , Zhang Yong Kang
Published: December 2010

Conventional FDSO (Floating Drilling Storage Offloading) construction method which needs particular dock and berth has limitation in application. A new block construction method for FDSO without dock and berth is offered in this paper based on the analysis of present FDSO block construction method. In this method, semi-submersible barge is utilized as a closure construction platform. The process includes the following stages: pre-segmentation closure, set limit and positioning components, separate the block from semi-submersible barge after block launching, rotate block with 90 degree and complete block construction. With the advantage of high assembly precision and small flatness adjustment, the presented method is especially suitable for cylinder FDSO’s close construction without large dock and berth.
Investigation of Laser Marking Technology with the Image Mask of Liquid Crystal Display
Authors: Chen Fei , Zhang Zhao Yang , Wang Yao Min
Published: December 2010

In the laser marking process system, a liquid crystal display (LCD) was used as the image mask, which can display dynamically and flexibly the various images by the programmable control. A nanosecond pulsed laser (1064nm) was applied to investigate the characteristic of laser photolithography fabrication technology. The light modulation function of LCD mask was firstly discussed by theory. By observing the graphics morphology with a high-powered optical microscope, it was found that the graphics of laser marking with LCD mask shows that its edges were not ablated but its line inside was ablated. According to analysis, the reasons of this phenomenon are due to the opaque lattice effect and the high light transmittance of black pixel. Results showed that the light modulation function of LCD mask was decided by adjusting the light transmittance with controlling the pixel voltage and a complete graphics was ablated in the range of 0.6J/cm2 ~ 0.8J/cm2.
Research on Virtual Assembly Technology Based on 3D Modeling Method
Authors: Yu Qian
Published: December 2010

Aiming at the current situation that there is lacking in-depth study on applications of virtual technology in mechanical manufacturing and assembly process control, the virtual assembly systems was researched and designed based on combining virtual reality technology with mechanical assembly process. The support mechanism of virtual assembly platform was designed based on taking shaft parts as example, and modeling method of 3D features parameters was adopted in order to build the model of virtual assembly parts, which was modeled according with the sequence as describing physical feature parameters of parts, building data structure of feature parameters and building model features library. On the basis of modeling virtual assembly platform, the key technologies of realizing the virtual assembly processing, which was from positioning issue and collision detection issue, were also analyzed, and control methods of virtual assembly processing were pointed out in detail. All is work is significative for enhancing the level of virtual technology applications, digital machinery manufacturing and assembly.
The Application of DSP in Eggshell Quality Online Detection System
Authors: Sun Li , Zhang Shi Qing , Cai Jian Rong , Lin Hao , Fang Gen Gen
Published: December 2010

An on-line system which based on acoustic resonance employed digital signal processer (DSP) as its core device for eggshell crack detection. The system consists of the IR trigger for detecting the egg’s coming, the motor drive for driving the DC motor, the signal conditioning circuit for signal amplification and filter and DSP for control and signal processing. Based on the analysis of response signal of eggshell which excited with a light mechanical, four featured descriptors were exacted for discriminating intact and cracked eggs. By using the on-line system for detection of cracked eggs, the identification rates of intact eggs and cracked eggs were 93.75% and 96.25%, respectively. This system can detect 5 eggs within one second, it completely meet the needs of on-line detection.
Improvement of Erosion Behavior and Mechanical Strength of up Resin Composites Filled with VGCF
Authors: Qian Dan Na , Xu An Chang , Bao Li Min , Takatera Masayuki
Published: December 2010

The solid particle erosion behavior of the body materials used in high-speed moving equipments has attracted widely attention from researchers. In order to enhance the erosion resistance of existing FRP materials and to develop new FRP materials with high strength and excellent erosion resistance, we attempted to use VGCF (vapor-grown carbon fiber) with high strength and high modulus as filler for reinforcing UP resin matrix. In this study, VGCFs were treated by UV ozone treatment for improving the interface adhesion, and the effects of the filler weight content, impact angle and impact velocity upon the erosion wear behavior of UP resin composite materials have been carried out. The mechanical properties of composites materials reinforced by VGCF were also evaluated. The results indicate that it is feasible to improve the erosion resistance and flexural properties of UP resin by VGCF filler simultaneously.
Research on Strategies of Introducing Negative Entropy Flows into Enterprises under Economic Crisis
Authors: Wang Z.G.
Published: December 2010

Currently, as the global economic crisis further deepens and spreads, financial crisis has extended to the area of the real economy, which has had profound influence on China’s media and small scale enterprises. The paper illustrates the strategy of introducing negative entropy flows into enterprises and its specific method from such aspects as development history, trends and meanings of the research on entropy theory, making a beneficial attempt to overcome economic crisis.
A Virtual Woven Fabric of Plain Using Real Float
Authors: Liu Ji Hong , Pan Ru Ru , Gao Wei Dong , Jiang Hong Xia
Published: December 2010

The automatic segmentation of flaws and acquisition of parameters in woven fabrics has been achieved. However, the problem is that information of gray information of float is difference with real fabric. It is important to use a fabric that includes the total information of woven fabrics, meanwhile, the fabric was illuminated even. To solve the problem, in this research, images of virtual woven fabrics of plain were developed in order to research the methods of automatic segmentation of flaws and acquisition of parameters in woven fabrics using the images of real woven fabric. The warp and weft float in the fabric were cut from the scan image of real fabric. The fabrics included main information of interlacing of warp and weft, the count, weaving density, and reflection property of real float. It was possible that the fabrics could be used to discuss the problem proving robustness of the algorithms by adding unique flaw to the fabric.
Discussion on Ballast Water Load Calculation Problem of Semi-Submersible Barge
Authors: Liao Dong Bo , Xue Ji Yuan , Qin Chang Feng , Zhou Yi Dan
Published: December 2010

For the semi-submersible barge normal and dangerous condition, ballast water load calculation model and scheme are proposed respectively. The load calculation example suggests that the ballast water load scheme obtained from load calculating optimization model suits the barge project actual engineering operation, and improves the operating efficiency, security and reliability of semi-submersible barge effectively.
Topology Optimum Design of Steel Bodywork Based on Genetic Algorithms
Authors: Yao Yu Peng , Shi Ying , Fei Ji You
Published: December 2010

With the minimum mass of steel structure for bodywork as the object, beam sections and location topologies as design variables, and the stress and displacement as constraints, the optimum model is established. With the method of killing or activating elements, a high level technique in MSC. Marc, by Genetic Algorithms, a new scheme of researching structure topology optimization is proposed and the calculation procedure system is programmed. Applied the system, a steel structure of bodywork is optimized successfully. The validity and practicability of the system are certified.
Development of Electronic Throttle Controller Based on LabVIEW Embedded Module
Authors: Fang Xiao Jun , Du Jia Yi , Yuan Yin Nan , Mao Gong Ping
Published: December 2010

The mathematical model of electronic throttle was established in this paper, and a sliding mode control algorithm was designed based on the model. The simulation made to validate the control algorithm was achieved by LabVIEW Control and Simulation Toolkit. The control program was converted to C code and downloaded to the controller by LabVIEW embedded module. The simulation results showed that the controller met the ideal effect. There are many advantages of this kind of development mode, such as graphical programming, rich function module and code automatic generation. The development efficiency and quality can be increased.
Modeling and Mechanical Simulation of Cycloid Gear for Two Teeth Difference Cycloid Pin Reducer
Authors: Sun Ying Shi , Guan Tian Min
Published: December 2010

The paper firstly gives the formation principle of two teeth difference cycloid gear; correctly calculates cycloid gear by using the analysis method when modified cycloid gear is engaged with pin, and a cycloid gear force analysis method of two teeth difference cycloid pin transmission which relatively corresponds to engineering practice is given. The force of two teeth difference cycloid gear compares with the force of one tooth difference cycloid gear with the same speed ratio. By verification of experiment, the calculation results of the analysis method conform to engineering practice.
Research on Active Vibration Isolation System for Precision Instrument Based on Four Piezoelectric Stack Actuators
Authors: Cao Qing Song , Hong Yun Yun
Published: December 2010

With the rapid development of smart materials, piezoelectric materials used as actuators in vibration isolation platform have been widely applied in precision machining, precision measurement and precision positioning, etc. This paper investigates active vibration isolation system of precision instrument based on four piezoelectric stack actuators, which is consisted of four bases, four piezoelectric stack actuators and precision instrument. Piezoelectric stack actuators are laid between the bases and precision instrument as active isolation components to suppress the vibration from the vibrating bases. Model of the active vibration isolation system is derived based on Newton's second law. Then the active controller is designed with LQR control algorithm. The simulation using MATLAB software show that this method is feasible and LQR controller designed can effectively suppresses the vibration of precision instrument.
Application of Embedded System in the Train Information Management System
Authors: Li Yu Feng , Ma Yi Shu , Feng Shu Ai
Published: December 2010

In order to make train monitoring easier, this paper is to design a embedded handheld device to replace the dump box of LKJ2000.Data acquisition, data dump, data analysis and printing will be realized in a handheld embedded syetem.This paper introduces the establishment of ARM-Linux development platform, transplantation and development technology of QT and SQLite,development of GPRS and wireless communication technology.Experiments show that,data acquisition and management become convenient and real-time with embedded database and GPRS.
Method of Multi-Attribute Decision Making for Interval-Valued Intuitionistic Fuzzy Sets Based on Mentality Function
Authors: Shen Liang Zhong , Li Guang Bo , Liu Wen Bin
Published: December 2010

This paper has summarized the current ranking method for interval-valued intuitionistic fuzzy numbers, and then through the introduction of decision-makers’ mentality indicator, presented a new ranking method for interval-valued intuitionistic fuzzy numbers based on mentality function. Not only the nature of mentality function is deeply discussed but also the decision-making model based on the interval-valued intuitionistic fuzzy numbers is constructed. At last, an example is illustrated to prove the model's accuracy and effectiveness.
Information Entropy of Rolling Bearing Friction Torque as Data Series
Authors: Xia Xin Tao , Chen Long , Meng Fan Nian
Published: December 2010

The information entropy theory is applied to evaluate the uncertainty of the rolling bearing friction torque. The data series are obtained via the experimental investigation on the friction torque of the rolling bearings under the condition of different rotational speeds. And the result shows that the information entropy of the friction torque increases with the rotational speed of the rolling bearing, revealing the new dynamic performance of the rolling bearing friction torque as a data series.
Dynamic Prediction of Rolling Bearing Friction Torque Using Lyapunov Exponent Method
Authors: Xia Xin Tao , Lv Tao Mei
Published: December 2010

Based on the chaos theory, the Lyapunov exponent method is employed to predict dynamically the time series of the rolling bearing friction torque. First, the embedding dimension and the delay time for the phase space reconstruction are estimated with the Cao method and the mutual information method, respectively. Second, the maximum of the Lyapunov exponents is calculated by small data sets. Lastly, the nearest neighboring point is sought via the Euclidean distance. The experimental investigation shows that the method proposed in this paper is able to forecast effectively the rolling bearing friction torque as a time series, only with very small predicted error.
Uncertainty of Rolling Bearing Friction Torque as Data Series Using Grey Bootstrap Method
Authors: Xia Xin Tao , Chen Long , Meng Fan Nian
Published: December 2010

Based on the information poor system theory, the grey bootstrap method is employed to estimate the uncertainty of the rolling bearing friction torque. The data series are obtained via the experimental investigation of the friction torque of the rolling bearings under the condition of different rotational speeds. And the results show that the mean of the dynamic fluctuant range (MDFR) of the friction torque increases with the rotational speed of the rolling bearing, revealing the new dynamic performance of the rolling bearing friction torque as a data series.
Feature Selection Method for Hydraulic System Faults Diagnosis Based on GA-PLS
Authors: Li Sheng , Zhang Pei Lin , Li Bing
Published: December 2010

Feature selection is a key step in hydraulic system fault diagnosis. Some of the collected features are unrelated to classification model, and some are high correlated to other features. These features are harmful for establishing classification model. In order to solve this problem, genetic algorithm-partial least squares (GA-PLS) is proposed for selecting the representative and optimal features. K nearest neighbor algorithm (KNN) is used for diagnosing and classifying hydraulic system faults. For expressing better performance of GA-PLS, the original data of a model engineering hydraulic system is used, and the results of GA-PLS are compared with all feature used and GA. The experimental results show that, the proposed feature method can diagnose and classify hydraulic system faults more efficiently with using fewer features.
Innovation and Practice of Numerical Simulation Teaching Platform of Engineering Test Courses
Authors: Liu Ting Rui , Gong Ai Ling
Published: December 2010

Engineering test courses are the core curriculums for the electromechanical majors. They are imperative or elective courses for the majors of Mechanical Design Manufacture and Automation, Test Control Instrument and Meter, Material Moulding and Control, and Process Equipmemt and Control. There are two problems which commonly exist in the textbooks and the problems have impact on students’ understanding and absorbing of the professonal knowledge. Based on the two problems, the paper researches on innovation and practice of numerical simulation teaching platform of Engineering Test courses based on Matlab, establishes half practicality simulation platform to realize signal acquirement, A/D transformation and signal display based on PLC controller , and builds Matlab codes platform to display typical signals, examples and exercises, so as to realize graphics interchange format and PPT static results, and real-time dynamic interchange demonstration in class.
Numerical Simulation of Root Effect of Prestressed Anchor Cable Group
Authors: Wang Zhong Chang
Published: December 2010

A new method of equivalent pre-stress is suggested by used of methods of equivalent strain and temperature according to different working mechanisms between free segment and consolidated segment of pre-stress anchor cable. The mechanism on reinforcement of pre stress anchor cable is simulated by finite element. Due to enhanced toughness and anti-crack of root effect, anchor cables restrained the rock mass deforming toward surface. Rock mass around consolidated segment sustain tension. The anchor cable of unequal length should be used to avoid the anchor in arrangement of the same rock layer. The space between of anchor cables should be widened under the conditions of satisfying the need of engineering.
A Three-Dimensional Hydrodynamic Lubrication Model for Chemical-Mechanical Polishing Considering Pad Roughness
Authors: Lou Fei Yan
Published: December 2010

A three-dimensional hydrodynamic lubrication model based on lubrication theory is developed which accounts for pad roughness and slurry flow. The distribution of the slurry film thickness and pressure between the pad and the wafer are predicted using the model. The effects of the pad roughness, the polishing applied load and rotation speed on slurry film thickness and tilt angle are discussed. At last, a CMP experiment is carried out. It is found that the results are proved the three-dimensional model considering pad roughness agrees well with our experimental data. The results improve the previous models so that the CMP process can be better simulated using the model. Furthermore, they are useful in the processing of CMP and the design of the pad roughness.
Mechanics Analysis on Leveling Tool of Offshore Jacket Platform
Authors: Gong Hai Xia , Peng Lin , Jiang Pei Ran , Wang Li Quan
Published: December 2010

The paper aimed to leveling operation of offshore jacket platform, studied mechanics principle of the leveling tool. When the clamp blocks inserted into the pile wall in leveling operation, the pile’s surface presented some indentations of elastic-plastic deformation, which can increase the cross-lifting force but the clamp is susceptible to be damaged certainly. So, special clamping block was designed including its material and mechanical structure, and force analysis of the pile under the action of the clamping blocks was finished, and dynamics simulation of contact process between the clamping block and the pile was finished too. An experimental prototype was developed to verify the clamping principle. Experimental results show that the clamping principle is correct and the leveling tool can meet actual needs.
Vibration Performance Analysis of FR Vibration Damper Using Finite Elements Method
Authors: Luo Xiao Yu , Zhang Yi Sheng , Zheng Yong Ping
Published: December 2010

FR vibration damper is widely used in overhead transmission lines to prevent aerolian vibration. In this paper, the vibration characteristics of the damper are analyzed. The finite element method software ANSYS was applied to investigate the modal, harmonic response and PSD of the damper based on the theory of mechanical vibration and dynamic analysis. The results prove that the FR vibration damper performs well in consuming the vibration energy of the transmission lines. Work done in this paper provides a new way based on numerical simulation in design and manufacturing of vibration damper, and has laid a foundation for further study of vibration damper.
Robot Indoor Navigation Method Based on 2D Barcode Landmark
Authors: Lin Guo Yu , Chen Xu
Published: December 2010

A method for robot indoor navigation based on two-dimensional (2D) barcode landmark is proposed. The scheme constructed on the 2D barcode principle is convenient to operate and easy to recognize landmarks and the barcode have coordinates for their positions and some ability to automatically correct errors. Landmarks are placed over the “ceiling” and photographed by a camera on the robot with its optical axis vertical to the ceiling. Through image segmentation, contour extracting, characteristic curves matching and landmark features identifying, the landmark is located, followed by analyzing the pieces of information about coordinates of the landmark and the deflective angle, with which to compute the robot’s current absolute position and heading angle. This scheme has experimentally demonstrated its effectiveness for robot indoor navigation.
Greedy Algorithm Based Multiple Target Searching for Mobile Robots
Authors: Guo J. Hung , Su Kuo Lan
Published: December 2010

The article mainly researches path planning and task allocation problems of multiple mobile robots using A* searching algorithm and greedy algorithm, and solve the shortest path problems such that the robots can move from the start point to reach the multiple target points in a collision-free space, and uses 2-opt exchange heuristic algorithm to improve the shortest path. In this manner, the mobile moves to the final target point through the other points, and construct the motion path using A* searching algorithm and greedy algorithm. The supervised computer control the mobile robot feedback to the start point from the final target point through the other points, and programs a shortest path using 2-opt exchange heuristic algorithm. We develop the user interface to program the motion path of mobile robots via wireless RF interface. It can displays the motion path of the mobile robot on real-time. The simulated results presents that the proposed method can finds the shortest motion path for mobile robots moving to multiple target points from the start point in a collision-free space. Finally, we implement the experiment scenario on the grid platform using the module-based mobile robot.
Logarithmic Spiral Bevel Gear Tooth Contact Inspection
Authors: Li Qiang , He Wen , Yan Hong Bo , Zhang Hong Xiang
Published: December 2010

Introduction of spiral bevel gear tooth contact detection method, detection method based on the principle of EPG in the Y9550-type bevel gear roll tester on a pair of spiral bevel gear tooth contact area of sample detection experiment, obtained by experiment logarithmic spiral bevel gear contact area of the location, shape and size of the result. The experimental results with the Gleason spiral bevel gear contact area and the ideal number of spiral bevel gears on the contact area were compared, obtained on the number of spiral bevel gear tooth contact of the correlation.
Model Analysis of Micro-Feed Tool Holder Based on Finite Element Simulation
Authors: Mei Jie , Zhen Yu , Chen Ding Fang , Li Wen Feng
Published: December 2010

The theoretical derivation of model analysis is elaborated first in the paper. Then combined with the developed micro-feed tool holder, the structure’s first ten order vibration mode is analyzed through the finite element analysis software. From the analysis results, the natural frequency in every mode is finally obtained. After the analysis, an important conclusion is put forward. Based on the conclusion, an improvement measure for the micro-feed tool holder structure is proposed.
Design and Integrated Simulation of the Electro-Hydraulic Servo System Based on AMESim and Matlab
Authors: Xu Xiang , Li Zhi Xiong , Qin Hong Ling
Published: December 2010

Since electro-hydraulic servo system has fast response and highest control accuracy, it has been widely used in industrial application, including aircraft, mining, manufacturing, and agriculture, etc. With the fast development of computer science, it is feasible and available to evaluate the performance of the designed control system via virtual simulation before the practical usage of the system. In order to optimize the design procedure of the electro-hydraulic proportional controller, the co-simulation design method based on AMESim-Matlab is presented for the electro-hydraulic servo system in this paper. High accuracy of the mathematical model of electro-hydraulic servo system was full-fitted by the use of AMESim, and the advantage of high solving precision for large amount of calculation was full played using Matlab. The PID controller was employed to realize the efficient control of the motion of the hydraulic cylinder. The united simulation technique was adopted to verify the good performance of the designed control system. The simulation results suggest that the proposed method is effective for the design of electro-hydraulic servo systems and thus has application importance.
Modeling and Analysis on Servo Adjustment of Bidirectional Variable Displacement Pump in Hydraulic Drive System of the Cutter Head in a Shield Tunneling Machine
Authors: Xia Bi Zhong , Feng Ping Fa , Yang Hua Yong
Published: December 2010

Based on introduction of the basic configuration, working features of hydraulic drive system of the cutter head in a shield machine, the internal structure of the bidirectional variable displacement pump, BVDP, as the kernel element in the above hydraulic system, is depicted and compared with the ordinary variable plunger pump. Then the working principle and process of hydraulic pilot operated servo displacement adjustment about the BVDP are discussed in detail, and then the mathematical models and its transfer functions of the positive and negative displacement adjustments are established respectively. Also, the relationships between the primary performance indices such as stability condition, positioning stiffness, steady-state error, as well as initial control pressure and system parameters are analysis and concluded.
An Improved Algorithm for Tooth Contact Analysis for Hypoid Gear Based on Axial Section Programming
Authors: Wei Wei , Zhang Lian Hong
Published: December 2010

An improved algorithm of tooth contact analysis (TCA) is proposed to overcome the deficiency of the current TCA algorithm for hypoid gear. The key improvement of the proposed algorithm is to introduce proportional coefficients of tooth length and tooth height in TCA. The solution domain of the nonlinear equations in TCA is limited in the range of tooth surface by variable substitution. By analyzing the positions which boundary points possibly appear on axial section, the values of proportional coefficients corresponding to the positions are obtained. Boundary points of the contact trace are computed with particle swarm algorithm and conjugate gradient method, and distributed points on the contact trace are solved according to information of boundary points. With the improved algorithm the boundary points of the contact trace can be figured out accurately and there is no need to set initial values for tooth contact analysis.