bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Control Strategy of a 4WD Hybrid Electric Vehicle with a Two-Speed Transmission
Authors: Chen Ze Yu , Li Xue Jiao , Jiao Bin
Published: August 2013

A new-style four-wheeled driving (4WD) series-parallel hybrid electric vehicle (HEV) plus with a two speed transmission is presented in this paper. The system structure and operation principles are discussed systematically, and then the control strategy is proposed. Control strategy focus on the multi modes switch logic and power distribution. In addition, shifting strategy of the two speed transmission is researched. Simulation results indicate that the presented 4WD HEV can realize nice dynamic property; the presented control strategy is correct and effective.
Design and Realization of CNG Intelligent Monitoring System
Authors: Wang Zhen Hua , Yu Ge Fei
Published: August 2013

One CNG remote intelligent monitoring system is designed and realized in this article. The monitoring system can receive real time monitoring information and monitor environment of CNG filling station by using GSM short message platform , terminal PC and cell phone based on ARM microprocessor, PTM100GSM module, pressure and temperature detection system, when the pressure, temperature or consistence of gas storage well is over the threshold , the monitoring system will send the alarm signal. Its proved that the monitoring system works stably and reliably and can effectively monitor fatal public danger signal.
Wavelet Based Measurement on Photoplethysmography by Smartphone Imaging
Authors: Ju Bin , Qian Yun Tao , Ye Huo Jie
Published: August 2013

[Purpose] Smartphones video cameras can be used to detect the photoplethysmograph (PPG) signal.The pulse wave signal detected by smartphone always mixed mass noise because of finger moving, unevenness of pressure and outer light interference. Previous studies limit to the filtering algorithm that denoising signals, without considering characteristics information of pulse wave itself. [Method] In this paper, we propose an algorithm based on wavelet to detect qualified PPG, which captures three critical characteristic quantities through wavelet high frequency coefficient. [Results] Experiment illustrates that the detected PPG signal contain dicrotic wave, and whats more, further experiment on artery elasticity indexes indicates good robust of the algorithm. [Conclusions] Wavelet Based Measurement on Photoplethysmography by Smartphone Imaging can be used for the calculation of cardiovascular parameter such as angiosclerosis, arrhythmia, and vascular resistance.
Research on VMC0656e's Stability of Accuracy Test Technology
Authors: Lin Jian Feng , Liu Kuo , Zhou Shuai
Published: August 2013

Aiming at the status of domestic CNC machine tool's low stability of accuracy, stability of accuracy test of 5-axis machining center VMC0656e is done. The concrete scheme of test is presented. The laser interferometer is used to test accuracy of every link and the influence of loading test to accuracy is mastered. Finally, the results are analyzed and the measures to improving machine tool's stability of accuracy are presented.
The Application of PSD in Vibration Measurment
Authors: Zhu Yuan Tao , Wang Tao , Yin Fei
Published: August 2013

Position Sensitive Detector (PSD) is a new type of photoelectric position sensor. Compared with traditional CCD, PSD has high position resolution, simple circuit and fast response. Operational principle of PSD and how it can be used in vibration system are firstly shown in this paper. Based on the MCU, a vibration measurement system using a BOS-PSD0220 type sensor is designed. The system is then experimentally measured at the most sensitive area of PSD. The result is compared with data calculated by MATLABLE, which demonstrates PSD is a good choice for vibration measurement.
Lifting Capacity Detection System of Tower Crane Based on LabVIEW
Authors: Cao Ling Zhi , Zheng Miao
Published: August 2013

The real-time acquisition of lifting capacity is a common problem in the course of tower crane work. Its an accurate and reliable method to use shaft pin type load cell to convert weight to electrical signal which is detected and processed in practical. Using STC89C52 as the core processor, the hardware consists of signal section modulating circuit, acquisition circuit and communication circuit; C language and LabVIEW graphical language are used to develop the system, including A/D conversion, data transmission, reduction and linear compensation, section control and data storage. As shown in the experimental results, the system improves the detection accuracy of the lifting capacity. It has friendly man-machine interface and is easy to analyse and process subsequently.
A Particle Filter Update Algorithm Based on out of Sequence Measurement
Authors: Gong Xiao Mei
Published: August 2013

Consider out of sequence measurement (oosm) estimation problem in central tracking system of multi-sensor distributed data fusion, which is due to the communication delay. Apply the particle filter algorithm to overcome this problem and propose a update algorithm for the case of an arbitrary (multi-step) lag in case of nonlinear. Then we compare this algorithm with the known EKF oosm algorithm. Results demonstrate the feasibility and effectiveness of this algorithm.
Design of Remote Vibration Monitoring System Based on Wireless Technology
Authors: He Hong , Zheng Yi , Li Jian Wen , Wang Yue
Published: August 2013

In many engineering applications for vibration detection, some applications cant be field measurements, or cant be long-term monitoring because of the influence of geography, the weather or other special factor. This paper put forward a kind of design project based on the wireless technology which can monitor vibration long range. This system can carry a detective of a target for a long time far away based on an actual application test. At the same time, it can accurately respond to the Vibration of the monitored object and availably solve the problem that traditional vibration examination system is influenced by environment factors. Furthermore, it expands the applied realm of vibration monitoring system.
Finite Element Analysis of Model SZX20×2 Low Temperature Twin-Screw Oil Press
Authors: Wang Jun Jie , Zhang Yong Lin
Published: August 2013

Worm is the executive component of the twin-screw oil press, and the design of the worm effect the performance of twin-screw oil press. In this paper the 3-dimensioned geometric model of the worm was established with SolidEdge, the static analysis for the established model was finished and the natural frequency of the worm was analyzed with ANSYS Workbench. Then the first six level natural frequencies and vibration mode were obtained, which provide the basis for dynamic analysis of the worm.
Calibration of a Multi-Beam LIDAR by Using Linear Instrumental Error Model
Authors: Zhu Zhu , Liu Ji Lin
Published: August 2013

This paper presents a method for intrinsic calibration of a multi-beam LIDAR system. Existing approach to solve the problem by taking the distance instrumental error model of the LIDAR as a constant, however, further research demonstrates the linear model is more accurate to describe the distance error of a laser measurement system. We use linear instrumental error model to calibrate the multi-beam LIDAR system. The optimization process is based on comparison the scan data with the ground truth environment. Experimental results show the efficacy of the calibration.
Fault Diagnosis of Aircraft Engine Based on Order Analysis
Authors: Tian Hao , Shang Li Min , Jia Yun Fei , Li Yong Jian
Published: August 2013

Condition detection of aero-engine is an important measure for the safety of engine. This paper introduced the principle of order tracking analysis, which was compared with the tradition spectral analysis, represented the advantage of this method. Finally, applied order tracking for the condition detection of aero-engine, show the validity of this method through the experiment.
Study of Grid Trust Model Based on Virtual Domain
Authors: Zong Zhong
Published: August 2013

In the complex grid market environment, inhibiting the malicious behavior of grid nodes, taking punishment and incentives and guaranteeing the quality of the grid service are all important issues, which are must be resolved by the grid service market. This paper analyses the framework of the virtual network trust module. Combined with virtual domains combinatorial auction introduced into the process of trust building, this paper proposes a trust module, which finds the efficiency of trust and acts a good inhibition of a single malicious mode behavior.
Effect of UV Radiation on Different Voltage Grade of HTV-Silicon Rubber in Dry Conditions Performance
Authors: Liu Yun Peng , Shi Qian , Liang Ying
Published: August 2013

Along with our country " west-east electricity transmission " project and UHV projects, HTV-silicon rubber with superior properities has been more and more widely used in the western regions of China.The paper focus on hami to zhengzhou ±800kV UHV DC transmission project which in hami HTV-silicon rubber insulators aging problems, extract dry and the strong UV radiation climatic characteristics of the hami area to quantify, in the dry environment we conduct UHV levels of HTV-silicon rubber materials and normal voltage levels of HTV-silicon rubber materials on UV accelerated aging experiment.And the tests of hardness,static contact angle and Fourior transform infrared spectroscopy ( FTIR) are performed for the samples. The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH3 and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH3 and Si-O-Si keys is interrupted into free radicals; under the condition of the initial data of the two kinds of samples are similar , the variation of UHV levels of each data sample is lower than it of normal levels of samples. This is due to the UHV grade of HTV-silicon rubber materials on the formulation and manufacturing process are optimized, in the dry environment the UV aging resistance of UHV levels of HTV-silicon rubber materials is superior to it of ordinary voltage grade of HTV-silicon rubber materials.
Design of 25-Gb/s Half-Rate Clock and Data Recovery Circuit for Optical Communication
Authors: Hu Zheng Fei , Chen Ying Mei , Xue Shao Jia
Published: August 2013

A 25-Gb/s clock and data recovery (CDR) circuit with 1:2 demultiplexer which incorporates a quadrature LC voltage-controlled-oscillator and a half-rate bang-bang phase detector is presented in this paper. A quadrature LC VCO is presented to generate the four-phase output clocks. A half-rate phase detector including four flip-flops samples the 25-Gb/s input data every 20 ps and alignes the data phase. The 25-Gb/s data are retimed and demultiplexed into two 12.5-Gb/s output data. The CDR is designed in TSMC 65nm CMOS Technology. Simulation results show that the recovered clock exhibits a peak-to-peak jitter of 0.524ps and the recovered data exhibits a peak-to-peak jitter of 1.2ps. The CDR circuit consumes 121 mW from a 1.2 V supply.
Study on Symmetrical Machining Technology of a Ship Model Surface
Authors: Zhu Lin Sen
Published: August 2013

Because a ship model surface (SMS) is a large symmetrical freeform surface (LSFS), the machining efficiency and precision of current handcraft method is very low. According to the shape characteristics of SMS, this paper adopted symmetrical machining (SM) technology to manufacture SMS, solved the collision of cutters or headstocks in SM process, proposed the machining solutions for symmetrical machining residuals (SMR), divided the manufacturing process to SM stage and SMR stage, and planed the tool path respectively. The real machining results of a twin-skeg SMS, which was machined by a 4-axis SM machine tool, conforms that the SM can reduce the SMS machining time from 60 workdays needed for handcraft method to 7 hours, and the machining precision and surface fairness are also improved obviously.
A Ring Topology of Double Circuit with Multiple Nodes Redundant Bus Design and Communication Strategy Research
Authors: Zheng Gui Lin , Chen Xi
Published: August 2013

The differential buses such as RS485 and CAN bus play an important role in industrial control field. In order to make the bus work properly in an extreme environment, this paper proposes a kind of ring topology of bus, by using multiple nodes and redundant method to enhance the reliability of communication of bus. On the other hand, by optimizing the strategy of communication, the efficiency of communication is improved remarkably. And using K/N(G) vote system model to demonstrate the reliability of some methods by calculation. Finally results validate that this new type of ring topology of double circuit with multiple nodes bus possesses good performance in reliability.
Mining Indirect Temporal Sequential Patterns in Large Transaction Databases
Authors: Ouyang Wei Min , Huang Qin Hua
Published: August 2013

Sequential pattern is an important research topic in data mining and knowledge discovery. Traditional algorithms for mining sequential patterns focus on the frequent sequences, which do not consider the infrequent sequences and lifespan of each sequence. On the one hand, some infrequent patterns can provide very useful insight view into the data set, on the other hand, without taking lifespan of each sequence into account, not only some discovered patterns may be invalid, but also some useful patterns may not be discovered. So, we extend the sequential patterns to the indirect temporal sequential patterns, and put forward an algorithm to discover indirect temporal sequential patterns in this paper.
A Robust State Estimation Method Based on Exponential Weight Functions
Authors: Pu Tian Jiao , Han Wei , Dong Jing Yuan , Li Qun , Lin Ji Keng
Published: August 2013

State estimation of power system is the basis of all the high level application and analysis for dispatch centers. Against the bad convergence of the WLAV (weighted least absolute value)-based state estimation method, a new robust state estimation method based on exponential weight function (E-LAV) is presented in the paper. This method uses an exponential weight function to replace discontinues weight function of WLAV to improve the poor convergence. The results of the sample system of 4-node system and the IEEE 118-node system show that the E-LAV-based state estimation method not only owns the similar convergence as WLS-based method, and also owns a strong robustness. Through modifying the weight matrix of the least squares, the proposed new method has good prospects for application in practical engineering.
Application Research of the Power Spectrum Estimation in the Ankle-Brachial Index Detection
Authors: Wang Guo Yong
Published: August 2013

The key of ankle-brachial index (ABI) measurement is accurately measurement of upper and lower extremities systolic pressure. When the blood flow is blocked, blood flow will resume a normal beat and the corresponding cuff pressure of the first trough starting point is the systolic pressure. First it detects the pulse signal main frequency by spectral analysis of the pulse signal which based on the power spectrum estimation. Regarding pulse signal frequency as the basic standard, it achieves power spectrum estimation of blood flow signal with a sliding window. Last it achieves locating the position of systolic pressure by detecting whether the blood flow signal frequency and the pulse signal frequency are the same. Through simulation and experiments, it can achieve accurate detection of systolic pressure and automatic measurement of ankle-brachial index by application of this method.
A Configurable Tilt License Plate Correction Method Based on Parallel Lines
Authors: Liang Zhong Yan , Zhang San Yuan
Published: August 2013

The tilt license plate correction is an important part of the license plate recognition system. Traditional correction methods are based on one theory. It is difficult to use the advantages of different approaches. We propose some methods to help improve the tile license plate correction: a bounding box selection method based on similar height and a mutual correction method based on fitted parallel straight lines. Moreover, we use wide bounding boxes to segment touched characters. If the method based on parallel lines fails, another method, such as PCA-based one, can be used for complement. Experimental results show the proposed method outperforms others.
Research of Sandbox Sand Body CT Image Processing Methods Based on Fuzzy Similarity
Authors: Ren Xu Hu , Bai Jin Qiang
Published: August 2013

Based on analyzing and discussing the sand body CT fault image features in tectonic physical simulation experimental sand box, some technical schemes and methods of sand body CT image processing are proposed. Aiming at the characteristics of sand body CT sequence images, such as blurs, poor quality and obscure boundary between the layers, based on the correlation between pixels, fuzzy logic is applied to the edge detection of gray images, and an edge detection algorithm based on fuzzy similarity model is proposed. The experimental results show that the proposed algorithm has better performance than traditional edge detection operators.
Design and Implementation of Object Monitoring and Management System for Satellite Location
Authors: Tang Li Wen , Li Xiao Jiang , Li Yi Yong
Published: August 2013

The overall design was explained from three aspects about object monitoring and management system for satellite location. The functions of information comprehensive process, situation integrated display, information terminal were proposed. Then the system which interconnected center control node and terminal nodes was developed by integrating communication technology, GIS technology, GPS technology, and Beidou navigation technology, thus it realized the bidirectional information interaction between all the nodes. Based on MapGIS, the objects dynamical monitoring and management were implemented on the tactical situation map, as well the key technologies for the system were described.
Modeling and Simulation of the Propagation Characteristics by Underwater Conduction Current Field
Authors: Xue Wei , Wang Jun
Published: August 2013

Underwater conduction current field communication is a low noise system. It is absolutely to realize the short-distance underwater wireless communication .Compared with underwater acoustic communication, because of the electrical noise underwater is very low, so using underwater current field to realize short-distance underwater wireless communication has a certain advantage. In order to implement the design of conduction current field in underwater communication system better, its necessary to explore and study underwater signal transmission by establishing mathematical model of underwater signal propagation characteristics based on the theory of constant current field and simulating the mathematical model with MATLAB. To fully understand the underwater conduction current field channel characteristics in the actual field environment, we established a simulation model of underwater conduction current field communication channel physical experiment and obtained the amplitude frequency characteristics of the channel based on the external field test data, it laid a solid foundation for the parameter selection of underwater communication system.
Use of Information Technology in Design Interface Coordinate
Authors: Lu Pei , Liu Bo , Liang Yong Hui
Published: August 2013

Design interface were divided into three levels according to the characteristics of design process. The paper analyzes and give the main reasons which result in design interface. By comprehensive analysis, countermeasures are put forward to solve the design interface from the perspective of the total design institute.
Research on Thermal Balance of Oil Gas Suspension Based on Vehicle Dynamics
Authors: Chen Yi Jie , Zhang Ya Feng , Guo Jian Juan , Wang Ya Jun , Feng Dong Liang
Published: August 2013

Acording to the oil temperature influenced on the seal reliability, this paper put forward to the importance to study the temperature rise of the damping device. The thermodynamics of physical model of oil gas spring under the forced convection condition was established. The heat transfer coefficient expression of the correlation surface and the comprehensive heat transfer equation were deduced. After that, the external force and internal energy change rate of oil and nitrogen were researched. Through the principle of conservation of energy and the real gas state equation, the oil gas spring thermodynamic mathematical model was created. In the end, the external influence factors on the oil temperature rise were analyzed, the conclusion could be used as a reference for the design of damping device.
Study of Production Scheduling of the Digital Workshop on Limited Cache Area
Authors: Gao Lei Lei , Guo Xiao Jun
Published: August 2013

In view of the limitations of EPR infinite capacity theory, and based on that the infinite capacity of production scheduling methods already can not adapt to modern enterprise management requirements, this paper regards the digital unmanned workshop as the research object, and build a kind of digital workshop production scheduling model based on limited buffer zone, and present the solving method. The model can improve the utilization rate of machine tools under the circumstances of limited buffer area. At the same time it provides a practical and effective solution to solve the emergency single plug.
Parametric Design Study of the Nonstandard Serialized Assembly
Authors: Xu Feng , He Wei , Xu Nian Fu
Published: August 2013

The parametric design method and software development of nonstandard serialized assembly components based on Pro/Engineer 3D software platform are introduced. The parametric assembly design process is done by the usage of Pro/Toolkit secondary development kit and C programming language. An intermittent star-wheel assembly is presented as an example. The design accuracy and productivity of non-standard serialized assembly components can be significantly increased by adapting this method.
The Research on Reliability of Drilling Automatic Sampling Mechanism
Authors: Wang Li Li , Pang Yu
Published: August 2013

This article put forward drilling mechanism reliability evaluation method on the lunar surface based on probability theory of stress-strength according to the characteristic, working environment and force condition of drilling automatic sampling mechanism on the lunar surface, ABAQUS was utilized to model and simulate the drilling automatic sampling mechanisms, and the dynamic distribution of stress of drilling automatic sampling mechanisms was obtained. According to analytic system reliability and the reliability evaluation reasonably, the optimization allocation to the use of material and system reliability can be realized.
Persistence Properties and Unique Continuation of Solutions of a Two-Component Camassa-Holm Equation
Authors: Kang Shun Guang , Jia Jia
Published: August 2013

This paper is concerned with persistence properties and unique continuation of solutions to a two-component Camassa-Holm system. It is show that there are three results about these properties of the strong solutions. In particular, it is show that strong solutions of the two-component Camassa-Holm system, initially decaying exponentially together with its special derivative, must be identically equal to zero if they also decay exponentially at larger time.
Research on Vehicle Routing Optimization Based on Improved Ant Colony Algorithm
Authors: Wang Rui , Wang Zai Tang
Published: August 2013

This paper analyzes the domestic and international logistics distribution route optimization problem and the research status of ant colony algorithm, illustrates the problems existing in the logistics distribution now. It reflects the necessity to research on the vehicle routing optimization problem. In order to increasing the ant colony algorithm’s convergence speed and avoiding to fall into local optimum, we improve the pheromone evaporation coefficient and visibility to optimize the searching ability, which can avoid premature convergence and stagnation.
Choice of Less-Teeth Gear Parameters Based on MATLAB
Authors: Zhang Dong Sheng , Lv Zhang Lai , Zhang Jian Jun
Published: August 2013

Less-teeth gear is increasingly promoted and applied because of the big single-stage transmission ratio, light weight, compact structure. The selection of gear parameters has been the key and difficult point of the design of less-teeth gear. At present design method involved in less-teeth gear design is rarely existed. According to the relationship between the characteristics and parameters of the less-teeth gear, using MATLAB for the optimization choice of the less-teeth gear, reasonable selection of the spiral angle and modification coefficient is realized, which can provide clues to further research of the less-teeth gear.
Kinematic and Workspace Simulation of Flexible Assembly Tooling for Aero-Engine
Authors: Shi Hong , Li Wei Nan , Zhu Ning
Published: August 2013

This article, combining the robot theory, applies the serial parallel manipulator to the configuration to design a flexible assembly tooling, which is used for aero-engines of different types and models. First, the inverse kinematics solution and workspace are analyzed, then a model in Adams is built to simulate the kinematic characteristics. Finally, the simulation result is used to contrast with the theoretical calculation to verify the correctness, and to solve forward kinematics. This work has outstanding theoretical and practical significance for assembly accuracy improvement, optimizing assembly performance and dimensional synthesis.
Analysis on some Mechanical Properties of the Horizontal Opening Catenary
Authors: Pan Xiu Juan , Xie Fei , Sun Ming Zhu
Published: August 2013

Based on the catenary equation, we deduced the gravity and rotation inertia formula of catenary, and obtained the tangent angle of each point on the rope , the tension of the rope and other mechanical parameters. Then we discussed two kinds of situation and calculated all of the corresponding parameters with the Mathematica, and analysis the trend of these mechanics parameters in detail and the numerical results demonstrated the properties obtained. The methods we employed in calculation and analysis can be applied in analyzing the properties of tension and stress of dangling cables in engineering.
Application of Composite Core-Pulling Mechanism in Mobile Phone Cover Injection Mould
Authors: Hong Jian Ming
Published: August 2013

By process analyzing of the mobile phone cover, the overall mold structure and key design points for this product was introduced, the typical design methods for this kind of mold such as angle lift core-pulling mechanism and angle pin core-pulling mechanism were discussed. The part was ejected easily by adopting the angle lift mechanism and double ejection system. The working process of the injection mould was analyzed. Industrial practice proved that the action of the core-pulling mechanisms, ejector mechanisms and resetting mechanisms was stable and reliable.
The Design of Wind Tunnel to Research the Features of Insulator Deposition of Dirt
Authors: Huang Hua , Lv Fang Cheng , Liu Yun Peng , Liu Qin , Xu Tao , Wan Xiao Dong
Published: August 2013

Pollution flashover fault is one of the most common fault in transmission line, the study of the features of insulator deposition of dirt is very important. Mainly considering the factor of the choice of the maximum wind speed, the adjustment of wind speed, the stability of the flow field. Design and build the wind tunnel laboratory, through the establishment of the wind tunnel laboratory to simulate the features of insulator deposition of dirt.
Verifying Three Nodes Optimization Based on LM-BP Neural Network and Hybrid Genetic Algorithm
Authors: Li Xin , Zhang Zhong Peng , Shen Shi Lin , Xie Fei
Published: August 2013

Taking the minimum to cylinder thrust force, turntable force and boom force as the objective function then establish the optimization mathematical model of the verifying three nodes, taking BP Neural Network as the main method instead of the cumbersome formula derivation. This article puts forward a Hybrid Genetic Algorithm flow set of solving pareto optimal solution, It is achieved by mixed-using Niche Technology, Groups Sorting Technology. The optimal position of the arm verifying three nodes is conformed by programming using Matlab genetic algorithm toolbox. And the force of the fuel tank , boom and turntable is effectively mitigated. This gives a appropriate reference for the next boom verifying three nodes position to determine and the optimal design of similar structures in other engineering machinery.
Analysis of Engineering Geological Mechanics on the Jiasikou Debris Flow
Authors: Su Ming Hui , Ma Xin De , Li Xiu
Published: August 2013

The debris flow in Jiasikou gully was a typical gully debris flow, which was located in Li xian, Sichuan province, China. According to the basic characteristics of the valley and the debris flow, we analyzed the formation conditions of the debris flow in Jiasikou gully, including topography, water source and sediment source. And we calculated the main dynamic parameters, such as bulk density, flow rate, flow capacity, sediment flush-out and impulse power. Combining the features of above mentioned, we discussed the development trend of the debris flow, and put forward recommendation that blocking dam and diversion dike engineering should be carried out.
Study on Mineral Blending Models for Poly-Metallic Open-Pit Mine
Authors: Li Di , Hu Nai Lian , Li Guo Qing , Gong Jian
Published: August 2013

According to mineral blending problem of poly-metallic deposits, this paper addresses a single-objective blending model and a multi-objective blending model separately. An open-pit copper-molybdenum mine was chosen as an engineering background to demonstrate these two models. Then actual blending results of two models were analyzed comparatively. It is concluded that multi-objective mineral blending model is more suitable for practical production in poly-metallic deposits with more flexibility and accuracy.
Decision Strategy for Fault Troubleshooting Using Bayesian Influence Diagram
Authors: Wang Yu Sha , Huang Ying Ping , Zhang Ren Jie
Published: August 2013

Using Bayesian Network is currently an effective solution to automotive fault diagnosis. However, Bayesian Networks can only be used to reason and calculate probability of component failure. During a fault troubleshooting process, apart from fault probability, diagnostic engineers also need consider the utilities of repair actions to make a sensible repair decision. The paper extends a Bayesian Network to a Bayesian influence diagram, which integrates the influences of both probability and utility. An automobile engine start-up failure is used as a case study to establish troubleshooting decision influence diagram. The diagram combines failure causes, decision actions with their utilities and is able to reason and calculate the expected utilities of each action. Troubleshooters choose faulty component with the highest utility to repair. The method ensures the most sensible repair action is selected in each troubleshooting step.
Research on 3D Modeling System Based on Binocular Vision Image Acquisition
Authors: Zhang Jing , Gao Ru , Liu Chun Yan , Zhao Ya Wei
Published: August 2013

Three-dimensional modeling of the image acquisition system based on binocular computer vision scanning system scene with MCU processing the two-dimensional image data collected by the CCD sensor, and complete the image binarization processing using hardware, to improve the efficiency of the image processing; using timing delay analysis circuit the edge of the identification image characteristics, the data amount of the compression of the image processing; will be collected by the CCD sensor the two-dimensional image data transmission to a computer, thereby effectively shortening the transmission time of the data.
Design of Household Conveying Robot Control System Based on STM32
Authors: Li Wen Jing , Ding Jin Hua , Wang De Quan , Gao Teng , Yan Fan Zhang
Published: August 2013

The aging problem of society and contemporary young people values's change, it is very difficult to find a natural person as a family helper in the demand of labor market. The design of household conveying robot in this paper is mainly used for disabled elderly patients or paralysis in bed. When they are not convenient to take objects, they need to have a household conveying robot which is easy to operate to help them complete. Robot use STM32 as the main controller and ZigBee module as wireless communication, realize robot's running, obstacle avoidance and a variety of angles of rotation of robot arm through operating the computer, and grab what they need to the target location.
The Research on the Workspace of the 3-TPT Parallel Machine Tool
Authors: Zhao Heng Hua , Yang Hui , Fu Hong Shuan
Published: August 2013

The workspace of a machine tool is an important indicator to measure a machine tool performance as well as the important data of mechanical design and motion planning. This article in view of the 3-TPT parallel machine tool. First, according to the positive and inverse solution of Mechanism kinematics, the expression of the range of motion of the moving platform reference point was calculated. Then, by considering the effects of rod length and Hooke joints on the workspace, the workspace could be simulated by using MATLAB software and LabVIEW software.The simulation results show that the parallel machine tool workspace is continuous and no caves.
Study on Error in Interpolation Algorithm of the-5-DOF-Hybrid Robot
Authors: Luo Ji Man , Zhang Ming Shan , An Yu Zhen , Sun Xiao Wei
Published: August 2013

In order to improve the accuracy of the-5-DOF-hybrid robot motion control, it is necessary to establish a mathematical model of the error in the interpolation process. On the basis of the structure characteristics of five degrees of freedom hybrid robot and the algorithm of linear interpolation and circular interpolation, the error calculation patterns about the concave surface machining and convex surface machining are set up respectively in the paper. Then, examples are analyzed. The results show that the nonlinear error caused by using the straight-line interpolation method is much smaller than the normal vector rotation error and linear approximation error; when conducting surface machining, the error caused by the application of circular interpolation algorithm is less than linear interpolation error. By the comparison of the error analysis of different interpolation method, the control methods for reducing errors are proposed.
Path Planning for Mobile Robot Based on Improved Ant Colony Algorithm
Authors: Wang Rui , Wang Zai Tang
Published: August 2013

This paper presents a dynamic path planning method based on improved ant colony algorithm. In order to increasing the algorithm’s convergence speed and avoiding to fall into local optimum, we propose adaptive migratory probability function and updating the pheromone. We apply the improved algorithm to path planning for mobile robot and the simulation experiment proved that improved algorithm is viable and efficient.
Crosstalk Force Analysis for Optical Pickup Actuator Systems
Authors: Jia Qing Xi , Wu Zhi Zheng , Li Yang , Liu Mei
Published: August 2013

When the optical pickup actuator moves, crosstalk force will be generated due to the non-uniformity of the spatial magnetic field, which will consequently affect the dynamic performance of the servo system in optical storage systems. In this paper, the spatial magnetic field model of the actuator is established and the concept of crosstalk degree in both tracking and focusing directions are defined. The relationship between the crosstalk degree and the structure parameters of the actuator such as the height, width and length of the permanent magnet are further analyzed, based on which the optimal structure parameters of the actuator are obtained.
Adaptive Robust Control of Speed Sensorless Permanent Magnet Linear Synchronous Motor
Authors: Yang Ren Jie , Yu Si Jia , Yang Hong Bing , Tang Chuan Sheng , Dai Yue Hong
Published: August 2013

In order to improve the dynamic performance of PMLSM, an adaptive robust controller is presented. Meanwhile, the stability of the system is proved by Lyapunov stable theory. The presented controller contains no other motor parameters except state variables. S-function based sliding mode observer is proposed to achieve the estimation of motor speed. The introduction of S-function in the observer can solve the chattering phenomenon caused by traditional sliding mode observer, and solve the amplitude and phase error caused by low-pass filter. Finally, simulation results verify the effectiveness of the proposed control scheme.
Speed Loss Compensation Simulation Analysis on Variable-Speed Pump-Control-Motor System
Authors: Peng Tian Hao , Ma Teng
Published: August 2013

This paper analyses the reasons of motor speed loss on variable-speed pump-control-motor governing system, and points out that the reasons are system leakage, electromotor characteristics and oil compressibility caused by system pressure change. Speed loss compensation method of variable-speed pump-control-motor governing system is put forward. Simulation analysis is carried out under constant load, variable load and variable-speed, and simulation results show that the compensation method can well compensate motor speed loss.
The Study of Winding Performance in Key Stage on a Parallel Grooved Drum
Authors: Zhang Qing , Zheng Jing Feng , Xiao Ying Yue , Qin Xian Rong , Sun Yuan Tao , Zhang Li Dong
Published: August 2013

The parallel grooved multi-layer winding drum can wind rapidly and reliably compared to traditional multi-layer winding drum, because of the special groove which is generated by circular and helical motion. The present paper represented the key winding stage for parallel grooved drum was the helical motion in first circle on the second layer, and the stage was simulated in ADAMS under several factors as fleet angle, winding linear velocity and rope tension. Taguchi method was adopted to estimate the winding performance through two simulation outputs, including the time delay compared to ideal time and the sum of amplitude error during the delayed time. Experiment was applied by considering more factors than that in ADAMS, and the experiment results could verify the validity of simulation in ADAMS. The simulation and experiment results showed that the optimal winding performance could be obtained with certain combination of factors.
Fluorite Flotation of a Fluorite-Bearing Pb-Zn Tailings
Authors: Liu Si Qing , Li Xiu Juan , Zhang Min , Wang Wan Ping
Published: August 2013

Beneficiation of a Pb-Zn tailings containing 44.98% CaF2 was conducted by flotation using sodium hexametaphosphate and new reagents S180. Details of reagent consumption, adding reagents at different stages and concentration of flotation pulp were investigated. Through all the investigation, an optimum reagent system and flowsheet were established. Finally, a marketable fluorite concentrate assaying 98.32% CaF2 with the recovery of 95.00% was obtained by one rougher,6 cleaners and 2 scavengers.
Optimal Design of Compensatory Cam for Precision Corn Planting Device of Furrow Seeder with Vertical Dropping with Whole Plastic-Film Mulching on Double Ridges
Authors: Zhao Wu Yun , Tang Xue Peng , Dai Fei , Yang Zheng
Published: August 2013

The design focus of precision corn planting device of furrow seeder with vertical dropping with whole plastic-film mulching on double ridges is to optimize its compensatory cam, and it aims to make compensation for the horizontal velocity of soil opener when the whole machine is moving forward. Under the precondition of ensuring sowing with vertical dropping by soil opener, the structure of compensatory cam shall also meet the requirements of smooth transition, space and cost saving. In order to achieve the above-mentioned design goals, the forward speed of machines and tools, the horizontal distance between the supporting point of amplification mechanism and the centering point of crank rotation, and the horizontal distance between cam and the centering point of crank rotation are taken as the experimental factors, offset circle radius, small-curvature radius and mass are regarded as the experimental indicators, therefore three factors and three levels orthogonal experiment is carried out, it is obtained that the optimal combination is A1B2C1 by analyzing the results of experiment.
Characteristics of Sea-Water Ice Slurry for Cooling of Fish
Authors: Pamitran Agus Sunjarianto , Ardiansyah Helmi Dadang , Novviali Mach
Published: August 2013

A more effective of cooling method is necessary for fish storage to get high quality and long freshness of fish. Ice block is not sufficient for fish storage because of its hard-solid surface that can damage the fish. Moreover for some remote area it is difficult to find ice block in good time with reasonable/low price. One solution for this problem is the using of sea-water ice slurry for fish cooling. Ice slurry is formed when the sea-water temperature goes down to its freezing point, when the early nucleation is formed. Crystal ice can be formed when chemical equilibrium is occurred. The purpose of this present study is to observe the characteristics of ice slurry generation using scraper blade evaporator and orbital rod evaporator. The experiment is done under some experimental conditions.
Combined Convection Heat Transfer of Nanofluids Flow over Forward Facing Step in a Channel Having a Blockage
Authors: Mohammed Hussein A. , Golieskardi Mohsen , Munisamy K.M. , Wahid Mazlan  A.
Published: August 2013

Numerical simulations of two dimensional laminar combined convection flows using nanofluids over forward facing step with a blockage are analyzed. The continuity, momentum and energy equations are solved using finite volume method (FVM) and the SIMPLE algorithm scheme is applied to examine the effect of the blockage on the heat transfer characteristics. In this project, several parameters such as different types of nanofluids (Al2O3, SiO2, CuO and ZnO), different volume fraction in the range of 1% - 4%, different nanoparticles diameter in the range of 25nm-80nm were used. Effects of different shapes of blockage (Circular, Square and Triangular) were studied. The numerical results indicated that SiO2nanofluid has the highest Nusselt number. The Nusselt number increased as the volume fraction and Reynolds number increase, while it decreases as the nanoparticles diameter increases. Circular blockage produced higher results compared to triangular and square one.
The Influence of Various Inlet Geometries on Mixed Convection Flow of Ethylene Glycol in a Backward Facing Step
Authors: Fathinia Farshid , Heshmati Amirhossein , Parsazadeh Mohammad , Wahid Mazlan  A. , Sies Mohsin M.
Published: August 2013

Numerical simulations of two dimensional laminar mixed convection flow over backward facing step with different inlet geometries in a duct is investigated by using finite volume method. The wall down downstream of the step is kept at a temperature of 330K and constant heat flux of 500W/m2, while the other walls that form the other side of the duct are thermally insulated. Ethylene glycol is used as working fluid and three types of barrier which are triangular, parallelogram and semicircle are carried out to compare with a simple entrance of backward facing step. The Reynolds number was in the range of 50Re200 and fluid temperature is 300K at the inlet of the channel. Parallelogram inlet has the highest average velocity in all sections and highest average Nusselt number over downstream. Also triangular inlet has the highest shear stress all over the downstream of the duct and cause to make a highest skin friction coefficient.
Effects of External Hard Particles on Brake Noise of Disc Braking System
Authors: Nasaruddin M.A. , Abdul Hamid Mohd Kameil , Mat Lazim Ahmad Razimi , Abu Bakar Abd Rahim
Published: August 2013

The open design and position of disc brake that is closed to road surfaces enable contaminants to enter the brake gap and caused noise and tribological disturbance at the brake interface. Contaminants such as dirt and soil can be present and are expected to influence the occurrence of brake squeal that produce an annoying sound during braking action. The objective of this study was to examine the effect of external hard particles at different disc sliding speed on generation of brake squeal using a brake dynamometer. Different rotational speed of disc brake was selected and the experiments squeal noise data was collected and analyzed using the Fast Fourier Transformation (FFT) analyzer. From the experiments, the presence of external particle and the rotation speed of disc brake promotes the generation of brake squeal phenomenon by changing the surface roughness and effective contact of brake interface. Results obtained from the experiment also showed that higher rotating disc generate higher sound level meter or squeal frequency and increase numbers of squeal noise generated.
Review of Numerical Studies on NOx Emission in the Flameless Combustion
Authors: Abuelnuor Ali Abuelnuor Abdeen , Wahid Mazlan Abdul , Saat Aminuddin , Sies Mohsin M. , Elbasheer M. Kabashi , Hosseini Seyed Ehsan , Dairobi Ahmed G. , Mohammed H.A. , Darus A.N.
Published: August 2013

Today one source of pollution emission in the combustion of fossil fuels is the formation of nitrogen oxides. To solve this problem many technologies have been introduced such as flameless combustion. Flameless combustion is of a great interest since it simultaneously provides higher thermal efficiency together with controlling the pollutant emission such as NOX. In this technology, the preheat temperature of the combustion air must be higher than the auto-ignition temperature of the reactant mixture. In this study, papers showing the numerical studies on the flameless combustion to reduce NOX emission are presented.
Environmental Protection and Fuel Consumption Reduction by Flameless Combustion Technology: A Review
Authors: Hosseini Seyed Ehsan , Wahid Mazlan A. , Salehirad Saber
Published: August 2013

In recent years global fuel consumption has increased in the world due to modernization and progress in the standard of living. The conspicuous rate of carbon dioxide and nitrogen oxide released to the environment and fuel resources are depleted day by day due to inconsiderate fuel consumption. Requirement for efficient use of any kinds of fuel has become the other concern due to the oil crisis and limitation of fuel resources. In combustion process, the abatement of pollutants often associates with efficiency loss. In the other word, high efficiency and low pollutant which are the main requirements of combustion are not fulfilled by the existing combustion. Today, flameless combustion has received more attention because of its low NOx emission and significant energy saving. Generally, compatibility between high performance and low NOx emission has been observed by preheated air application and changing the combustion characteristics from traditional flame to flameless mode. This paper aims to review the concepts and the applications of flameless combustion and gathers useful information to understand the necessity of transient from traditional flame mode to flameless combustion.