bluuebunny/crossref_metadata_2025 huggingface dataset:
Air Compressor Testing System Based on the HMI Software
Authors: Zheng Xiang Ming , Hu Jie
Published: October 2010

Assembly performance test bed is an indispensable equipment in the development and production of air compressor assembly. The test bed studied is a mechanical, electronic and hydraulic integrated equipment and its measuring and controlling system mainly consist of computer system, process channel, control object and measuring and controlling software. Guided by the “soft hardware” design conception, two “soft” subsystems was adopted in a one-level computer system to replace the generally adopted two-level “hard” system consisting of measuring and controlling subsystem and management subsystem. This improvement allows the more applications of integrated sensor and intelligent controller, resulting in a simpler hardware and greater openness. The practice indicated that, with rapid parameter adjustment, accurate measuring, large testing scope and high automation, the system meets all the technical indexes of test requirement.
Research on PONC Calculation Method in Manufacturing Process Based on Working Procedure
Authors: Xie De Feng , Wang Hui , Fu Xiu Li , Liu Chun Lei
Published: October 2010

Implicit cost (PONC) which was produced by nonconformance in manufacturing process bring a large number of loss to the enterprise. For the data of PONC during manufacturing process is difficult to collect, and difficult to calculate costing of scrap and rework PONC, the included projects and the calculation method of Price of Nonconformance is proposed and analyzed to quantify scrap and rework PONC. The calculation method can be programmed and implemented by means of C# language in the paper, and the working procedure which the Price of Nonconformance is beyond the standard is analyzed and improved. The results of example analysis and verification show the calculation method of PONC is effective way to improve the efficiency of cost management, reduce quality cost, improve product quality and increase the economic efficiency of enterprise.
Nonlinear Self-Adaptive Compensation of Screw down System of Tandem Cold Mill
Authors: Liu Bao Quan , Wang Zi Dong , Zhang Hong , Wang Jun Sheng , Zhang Yan
Published: October 2010

The Screw Down System (SDS) is a typical hydraulic servo control system. It is the key actuator of cold rolling mill. The dynamic performance of SDS has a significant effect on the accuracy of thickness. Hydraulic servo control system is not always optimal and stable due to highly nonlinear and parameter uncertainties. In this paper, the most important nonlinear relating flow and pressure is analyzed. A nonlinear self-adaptive compensation method is designed. Modeling and simulating the hydraulic servo control system of SDS using this method, the numerical simulation results show that the maximum overshoot and static error of the compensated system are more less than that of without nonlinear compensation. The overshoot of the compensated system is less than 10% when the cold strip is rolling. So the thickness tolerance of the cold strip can be guaranteed easily. This self- adaptive compensation method can be used to other hydraulic servo control systems.
A Flatness Control System Design Based on Actuator Efficiency Factors for Cold Rolling Mill
Authors: Wang Peng Fei , Zhang Dian Hua , Li Xu , Liu Jia Wei
Published: October 2010

In order to improve the flatness of cold rolled strips, strategies of closed loop feedback flatness control and rolling force feed forward control were established respectively, based on actuator efficiency factors. As the basis of flatness control system, efficiencies of flatness actuators provide a quantitative description to the law of flatness control. For the purpose of obtaining accurate efficiency factors matrixes of actuators, a self-learning model of actuator efficiency factors was established. The precision of actuator efficiency factors could be improved continuously by correlative measurement flatness data inputs. Meanwhile, the self-learning model of actuator efficiency factors permits the application of this flatness control for all possible types of actuators and every stand type. The developed flatness control system has been applied to a 1250mm single stand 6-H reversible UCM cold mill. Applications show that the flatness control system based on actuator efficiency factors is capable to obtain good flatness.
Study on the Turret Feeding Servo System of Precision CNC Lathe
Authors: Song Jin Chun , Li Yi Ming
Published: October 2010

Turret feeding servo system is the connecting link of a servo motor and a linear motion unit. Studying the static performance and the dynamic performance of the feeding servo system plays a key role in precision finishing and it also is the key technology to realize the high precise CNC lathe. This article builds several mathematical models for the driving part, the speed governing part, the mechanical transmitting part and the feeding part of the feeding servo system using permanent magnet synchronous motor (PMSM) and then simulates the system with Simulink so as to verify the mathematical models; optimize the servo system by combining the traditional PID control with the fuzzy control and finally, compare and analyze the system performances under several control methods, which may provide references for designing a feeding servo system.
Study on Process Control Method of Kiln Outlet in Cement Production
Authors: Xiao Jun , Liu Bing , He Yun Xiao
Published: October 2010

This paper describes a configuration method of kiln outlet production line in which a new integrated control system PCS7 of Siemens is used. From the raw feeding to the clinker storage, and from measurement unit at the bottom to management at the upper system, the configuration realizes a transversal and vertical integration and automatic control of the productive process. The operational principle of the kiln, burning process of raw power, pulverized coal and hot airflow in the kiln and cooling procedures and transportation of clinker in grate cooler are all analysed at length. The control requirements, influencing factors and controlling methods of the secondary air flow, which is the most important factor in all process parameters, are analysed in detail, and the control loops of opening degree of valves and the speed of waste gas fan are designed to improve and stabilize the temperature of secondary air flow.
Study on the Elastic Properties of the Woven Fabric Liner of Spherical Plain Bearing with Self-Lubricating
Authors: Liu Zhao Lei , Shen Xue Jin
Published: October 2010

The structure of the woven fabric liner of spherical plain bearing with self-lubricating is introduced, according to the microstructure and the actual weave pattern of the liners, the fibre yarns undulation and the distance between two fibre yarns are taken into account. A general elastic properties analysis model adjusting to the stain woven fabric liner is built. The elastic properties of the fabric liner are obtained using the method of micromechanical through getting the material and geometric parameters of the fiber yarns in the basis of stiffness average. The parameter expression of the compliance matrix and nine elastic constants are obtained and the theory model of fabric liner is validated by the experiment. The calculation results are in good agreement with the experimental data.
Simulation of Closed-Loop Control of the Landing Position of the Water Jet out from Water Fire Monitors
Authors: Min Yong Lin , Chen Xiao Yang , Chen Chi , Hu Chuan Ping
Published: October 2010

Ordinarily, water fire monitor extinguishing systems are applied to protect large space places from fire. To intellectualize them and improve the water usability and extinguishing efficiency, it is necessary to realize the closed-loop control of the landing position of the water jet out from the monitors in order to let the water jet reach the fire point as fast as possible. According to the characteristics of the adjusting mechanism of fire monitors, combing with the new theoretical model for their water jet track, the closed-loop control procedure is simulated. The results show that the water jet can reach the ignition point after only several adjustments. The effective control procedure simulation paves a sound basis for the closed-loop control of the landing position of the water jet out from water fire monitors.
Application of On-Line Detecting Harmful Substances in Flue Gas in Safety Assessment and Harmfulness Forecast
Authors: Ye Zi Qing , Yu Xiao Yi
Published: October 2010

Combustion of power fuel in a large thermal power plant produces a great deal of harmful flue gas, which endangers personal safety of residents around it. In this paper, the injury mechanism of flue gas ejected by the thermal power plant is analyzed. The injury indexes of flue gas ejected by the thermal power plant are put forward. In order to improve the safety status of flue gas ejected by the thermal power plant, we developed a special instrument, which can detect on-line the injury indexes of flue gas ingredients, particle species, ejection speed and ejection flux in the ejected flue gas. The detection data can be used to assess the safety statue of the ejected flue gas, to predict the injury degree of the ejected flue gas to people and to provide basic data for establishing the valid emergency schemes.
Position and Attitude Control of Remote Ultrasonic Scanner Based on Sliding Mode Approach
Authors: Yan Han Bing , Ju Hui
Published: October 2010

For the purpose of inspecting workpieces or equipments under severe environment, remote ultrasonic testing is of great significance to realize online inspection for processing products or vital equipments. The key problem to apply the remote ultrasonic testing is to keep the stability of the control system for the scanner. Therefore, how to eliminate the uncertain effect of time delay to keep the stability of the control system is the main difficulty in the online ultrasonic testing process. This paper proposed a slide mode approach to realize the position and attitude control for remote ultrasonic scanner. The implement of sliding mode controller with uncertain time delay, the solution of sliding surface and control function are studied. With the dynamic model of the scanner, the controller system is established according to the analysis of the control approach. The simulating results of the system proved the proposed sliding mode control method satisfies the requirements of stability for the remote control system.
Development of Sheet Material Stamping Automatic Feeding and Pick-Up Device
Authors: Li Yan Rong , Niu Zong Wei , Sun Xiao Peng
Published: October 2010

In stamping production the traditional manual feeding and pick-up manner can lead to potential safety problem. The automatic feeding and automatic pick-up device can ensure the production safety and ease workers’ labor intensity. A kind of automatic feeding and automatic pick-up device and its control system are designed. The configuration, function and working principle of the mechanism were described. Hydraulic system was taken as power supply. Siemens S7-200 was adapted as the center of control system, Hall-effect switch sensor CS1020 was used to detect the position of components. Control theory was studied and programmed. The device described in this paper can realize stamping automatic. Adjusting the position and number of sensors can realize the feeding and pick-up automation of all kind of workpiece, make the system has flexibility and suit the change of production.
The Cascade Three-Elements Fuzzy Auto-Adapted PID Control System for Boiler
Authors: Wu Ming Liang , Wei Li Li , Huang Jian Kang , Wu Ming Yong
Published: October 2010

Medium and Small boilers, which are widely used, are common power equipments in power plants, Smelters, and chemical plants, and important to the safety and production of enterprises. In this paper, the main factors affecting the changing industrial boiler water level have been analyzed, and relevant control theory been studied. A cascade three-impulse supply water Fuzzy-PID control system and the implement of Fuzzy-PID control formula based on IPC and PLC have been introduced .The results of the simulation indicated that the design can overcome the illusive water level and can improve the performance of the system obviously. The cascade three-element feedback control system using IPC and PLC as the center control unit, combining the fuzzy control with the conventional PID control, obtains both virtues of the high precision of PID and the flexibility and adaptability of the fuzzy control.
Application Study of Variable Parameters PID Dynamic Tension Control in Cold Rolling Mill
Authors: Zhang Yan , Shao Fu Qun , Wang Jun Sheng , Liu Bao Quan
Published: October 2010

Automatic Tension Control (ATC) system is important for the cold tandem mill rolling of steel. Controller parameters must be adjusted continually according changing plant parameters to obtain better control performance. So it is very difficult to maintain strip tension within a tolerance with traditional PID controller. In this paper, the tension control systems are designed using variable parameters PID control on the basis of analyzing the dynamic tension control theory and the grey predictive control characteristic. Using the functional control can enhance the precision of the tension control. It is illustrated by simulation and Ansteel 1450mm mill production application results that the system dynamic response and robustness is advanced observably, and it has more favorable performance about restraining stochastic disturbances than conventional PID controller.
CVT Ratio Adjusting Process Control
Authors: Wang Cheng , Li Bing Yi
Published: October 2010

Aiming at the shortcoming of the integral accumulation in the process of CVT ratio adjusting control, which is caused by the general PID control method, a new ratio adjusting control system based on the shift integral PID control method was designed. The theory of CVT ratio adjusting process and the enhanced control method were analized. The enhanced PID parameter tuning principle was presented. The test-bed of CVT ratio adjusting control was devised and adopted to do the CVT ratio tracing experiments. The experiments of step ratio from 0.45 to 1.45 and from 1.7 to 0.7 were made. The experimental results proved that the new ratio adjusting control system and the enhanced PID parameter tuning principle were valid, which made the real ratio trace the object ratio rapidly and steadily. The control performance of CVT ratio adjusting was improved.
Application of LQR Techniques to the Anti-Sway Controller of Overhead Crane
Authors: Yang Bin , Xiong Bin
Published: October 2010

This paper explains and demonstrates how to design an anti-sway controller of overhead crane for eliminating pendulum of hook-headed. In this paper, we use Lagrange Equation in analytical mechanics to obtain a mathematical model of crane crab motion system. Then the paper comes up with a piece of new idea, i.e. applies linear quadratic regulator techniques to the anti-sway controller’ design of overhead crane. In order to make the designed linear optimal system meet the practical production requirements better, we use a parametric formula’s method of solutions to LQ inverse problems to obtain the weighting matrix Q. In fact, the method is simple and practical, and ensures the performance of closed-loop system is optimized. The paper will introduce the design steps of anti-sway controller of overhead crane and realization of anti-sway controller, which are new and original in this paper.
Effect of Welding Sequence on Deposition Geometry Control in GMAW Remanufacturing
Authors: Zhu Sheng , Liang Yuan Yuan , Wang Qi Wei
Published: October 2010

GMAW welding remanufacturing is the process to form part layer by layer, that it is typical nonlinear transient heat conduction. During remanufacturing, parts undergo heating time after time that the thermal cycle fluctuates acutely and the distribution of temperature gradient is complex. And welding sequence is of significant for remanufacturing accuracy control. This paper has studied the effect of three typical welding sequences (sequential welding, spacing welding and end to end welding) on the deposition geometry control in GMAW remanufacturing, combining numerical with real-time identification. The comparison shows that the simulation results are in accordance with the actual data, which verified the valid of finite element model. From the analysis, it is found that the deformation of end to end welding is the least, and then is the sequential welding and the spacing welding is the largest.
Early Fatigue Damage of Magnesium Alloy On-Line Monitoring by Nonlinear Ultrasonic
Authors: Yan Bing Sheng , Wu Bin , He Cun Fu , Jiao Jing Pin
Published: October 2010

This research develops a robust experimental procedure to monitor the evolution of early fatigue damage in AZ31 magnesium alloy with the acoustic nonlinearity parameter , and demons- trats its reliability by measuring the linear relationship between amplitudes of the second-harmonic waves and fundamental waves squared. Using this system, of two sets of specimens with different stress level is measured. The experimental results show that there is a significant increase in linked to fatigue degree in the early stages of fatigue life and reaches the maximum about 55%of fatigue life, when the stress level is ±60%of the yield stress, can characterize the early fatigue damage of magnesium alloy. However, when the stress level is ±70%of the yield stress, there is a regular fluctuation in linked to fatigue degree, this experimental results can’t be explained.
Study on Steady Condition Control of Hybrid Turbocharging System
Authors: Zhao Fu Zhou , Liang Rong , Chen Xiao Ping
Published: October 2010

This paper analyzes the principle of hybrid turbocharging system in a vehicle diesel engine, and proposes motor control model about hybrid turbocharging system in steady engine operation condition according to energy imbalance of the exhaust gas. The high-speed motor can work as a motor or a generator in this control model of different engine condition. Then mapping algorithms about n-dimensional linear interpolation and BP neural network are presented to solve steady condition control problem of the hybrid turbocharging system. Each algorithm is applied to map same sample data, the simulation results reveal that BP neural network mapping algorithm is more suitable for the mapping control of hybrid turbocharging system because BP neural network has better generalization ability and faster processing speed.
Application of Single Neuron PID Control Based on Variable Scale Algorithm in Tar-Ammonia Separation
Authors: Zhou Tian Pei , Huang Wen Fang
Published: October 2010

In the process of recycling chemical product in coking object, ammonia and tar were indispensable both metallurgy and agriculture, so the control of separation process for tar-ammonia was one of the most important control problems. Due to the density difference between the tar and ammonia was greater, easier to separate, the control method based on PID was used in field at present. But the control effect of traditional PID was not good because of environment change and fluctuation in material composition. Separation process for tar-ammonia was analyzed firstly, in view of the shortcoming of traditional PID control algorithm, single neuron PID control algorithm based on variable scale method was adopted through using optimization method. Detailed algorithm steps were designed and applied to tar-ammonia separation system. Simulation results show that by comparison with traditional PID algorithm, the algorithm have the following advantages: faster learning speed, shorter adjusted time and good convergence performance.
Study on the Wood-Based Hydrogel and its pH-Sensitivity
Authors: Duan Jiu Fang , Li Jian Zhang
Published: October 2010

A water absorbent wood hydrogel was prepared with the wood and acrylamide using glutaraldehyde as crosslinker. The structure of wood-based hydrogel was charactered by FTIR spectra. The monomer ratio, the amount of glutaraldehyde, the behavior of pH-sensitivity and salt-sensitivity of the wood hydrogel were studied in this paper. The results are as follows: The water absorption and grafting yield of wood-based hydrogel decreased with the increasing of wood content. The water absorption of wood-based hydrogel decreased with the crosslinker content increasing, the grafting yield increases with the crosslinker content increasing. The water absorption of wood-based hydrogel has strong sensitivity in pH value of 3.0 ~ 11.0 solution. At acidic and alkaline larger environment, the hydrogel shows a larger water absorption, and the smallest swelling ratio was obtained in pH7.0 buffer solution. The wood-based hydrogel shows stable behavior in different concentrations of sodium chloride solution.
A New Simulation System of Programmable Logic Controller
Authors: Hu Zhao Yong , He Han Wu , Duan Yu Tao
Published: October 2010

Programmable logic controller (abbr. PLC) is essential for automation in modern industry. In many colleges, it is also an important course for automation major. Currently, PLC is monopolistic technique with foreign company. Simulation of PLC has become popular scheme for substitute to real PLC. Virtual PLC is a kind of common scheme. Otherwise, virtual PLC is unfavorable of practical training for student. The thesis spread out exposition for a new simulation system, which consists of virtual PLC platform and a printed circuit board. The virtual PLC platform had been programmed under visual C++ by authors. It is a graphical programming tool, and is an interpretive routine too. Based on MCU, the board is developed for communication between virtual PLC and real control objects. The simulation system has been tried out. As an example, traffic light control of intersection shows feasibility and effectiveness.
The Application and Development of Automatic Tool Selection in Tool Magazine Based on PLC
Authors: Deng Chang Qi , Li Bin
Published: October 2010

In the machine manufacturing industry, CNC machine tools possess many advantages and have gradually become the leading machine tools to replace the ordinary machine tools. According to their processing usages, they can be divided into two kinds: general CNC and NTC. With the automatic tool change device consisting of tool magazine and mechanical arm, the latter can complete the most, if not all, processings of workpieces in a clamping. According to the instruction to select tools from the digital control system, the tools in the tool magazine can be located to the position for tool change, which is called automatic tool selection. Automatical tool selection can be implemented at random and sequentially. This paper focuses on random tool selection in ATC tool magazine controlled by Mitsubishi FX2N PLC series.
Research on Weak Signal Amplification Principle Based on Parabola Map
Authors: Huang Zhen Qiang , Zhao Wen Li , Wang Zhi Gang
Published: October 2010

In this paper, a new nonlinear amplification principle based on chaotic theory is proposed. Firstly, according to the basic properties of chaotic systems, such as the sensitivity of the initial conditions and the one-to-one correspondence between chaotic orbit and the initial value, we established the nonlinear enlarge model based on the parabola map. Then, after we studied the nonlinear amplification of the parabola map, and the binary relationship between input and output, we achieved the simulation of the nonlinear amplification with common signals. Thirdly, we compared the result of linear amplification with nonlinear amplification; and discussed the advantages and disadvantages of nonlinear amplification under real situation. Finally, we get the conclusion that the weak signal amplification principle which is based on parabola map has superiority. It can reduce the noise while enlarging the useful signal. In other words, it can improve the signal to noise ratio.
The Design of the Measuring and Controlling System of the High Power Pump Performance Test-Bed Based on Virtual Instrument Technique
Authors: Chen Shu Mei , Zhang Wei
Published: October 2010

To satisfy the performance test of the high power hydraulic pump, a test-bed is developed in this paper. The parameters, the sign of the control and the data of the state are concluded. The test-bed employs the virtual instrument technique and PXI bus structure as well as M series data acquisition apparatus, it can measure the important performance parameters, such as pressure, flow, torque, speed and temperature; then we deal with and analysis these data. During the testing procedure it can realize automatic control, such as regulating the flow, pressure and so on. During the measuring and controlling, we can also monitor the state of the test-bed and give an alarm, such as over temperature or pressure.
Modeling of Test Resource Based on Multi-Agent and its Application in Intelligent Virtual Instrument
Authors: Tian Xue Yong , Chang Tian Qing , Shi Shao Hua , Zhang Lei , Han Yang
Published: October 2010

Because of the poor reconfigurability of the existing test resource models and the faultiness of the intelligent modeling methods in automatic test system, the modeling method based on Multi-Agent was studied. By analyzing the characters of test resources, the test resource models were classified as device model, adapter model and configuration model. The typical test resource model based on Multi-Agent with three layers and five agents was built. The structure and function of system management agent, model reconfiguration agent, function management agent, channel control agent and function realization agent in the model were analyzed. Then its application in Intelligent Virtual Instrument was introduced. This model based on Multi-Agent has good reconfigurability and intelligence, and it can be used to build the general-purpose and intelligent automatic test system.
Study on the Technologies of Rapid Three-Dimension Optical Measurement for Spatial Tubular Joints Deformation
Authors: Shi Bao Quan , Liang Jin , Liu Qing , Zhang Xiao Qiang , Xiao Zhen Zhong
Published: October 2010

To solve the problem of deformation measurement for spatial complex tubular joints, a non-contact three-dimension optical method is proposed. Firstly, some artificial targets are pasted on the deformation area before loading. Then the three-dimension coordinates of those targets are calculated by three-dimension reconstruction technique including collinear equation, image orientation based on the coplanar equation, direct linear transform, epipolar geometric constraint and bundle adjustment. Finally, each single deformation stage is aligned to the basic stage, by tracking and comparing the three-dimension coordinates of the homonymous artificial targets, the deformation vectors are obtained. The precision evaluation experiments prove that the proposed measurement system could achieve accuracy of 0.1mm/m. Real scale model experiment shows that the proposed method could fulfill the efficiency and accuracy requirement in three-dimension deformation measurement of the spatial complex tubular joints. In addition, this method has the advantage of non-contact.
Influence Analysis of Multifactor on LCF Damage of Single Crystal Nickel-Based Superalloy under Multiaxial Non-Proportional Loading
Authors: Ding Zhi Ping , Chen Ji Ping , Wang Teng Fei , Li Ming
Published: October 2010

A formula of equivalent strain for FCC single crystal superalloy was derived based on Hill’s yield criterion and was used for design of biaxial tension-torsion strain paths and loading levels of specimens. biaxial tension-torsion non-proportional cyclic loading process for single crystal nickel-based superalloy at the temperature of 680°C and 850°C was simulated by FEM analyzes; and influence degree of factors, such as strain range, strain path angle, tension-torsion loading phase angle, cycle characteristics and temperature etc., to low cycle fatigue damage of single crystal nickel-based superalloy were analyzed by using analysis of variance based on orthogonal experiments. The results show that if Hill’s equivalent stress range is used as a fatigue damage parameter, the factors produce effects on low cycle fatigue damage of single crystal nickel-based superalloy. The factors are listed in the order of significance as followed: temperature, strain range, tension-torsion loading phase angle, strain path angle and axial loading strain ratio.
3-D Shape Measurement Based on Optic Interferometric Projection
Authors: Gan Jiang Hong , Zhou Li Ping , Chen Liang Zhou , Xu Long
Published: October 2010

This paper aimed to use a novel optic interferometric fringe projection to measure the three-dimensional shape of small object with high resolution. In this method, the projecting fringe pattern, which has a sinusoidal density distribution, good contrast and equal spacing, is generated by a spherical wave incident into a triangle-section prism. Project the fringe onto the subject under test, the image of the deformed fringe pattern modulated by object surface is captured by a high-speed CMOS camera and processed by the Fourier Transform technique to extract the phase distribution which is related to height information. An experimental system is set to conduct 3-D shape measurement and the result shows the validity of the proposed method. The projecting system is simple and compact, which helps to realize the integration and miniaturization of the system.
Modeling and Analysis for Sound Field of Rectangular Small Enclosure under the Excitation of Panel Loudspeaker by Using FEM
Authors: Fang Bing , Shen Run Jie , Guo Ji Feng , He Wen , Ma Ming
Published: October 2010

This paper aims to simulate the sound field of rectangular small enclosure excited by panel loudspeaker with FEM. Firstly, in order to testify the fluid-structure interaction theory in the field of acoustics calculation, coupled modal and uncoupled modal of loudspeaker and air were established. Result of harmonic response analysis shows that the vibration amplitude of uncoupled case is larger than the coupled case. The result just is in harmony with the fact. So when modeling the sound field, fluid-structure coupling should be taken into account. Secondly, for more accurate sound field simulation, different from most researchers’ modeling method that supposing the vibrating plate’s boundary of the loudspeaker is simply supported, this paper provide a more practical way that the boundary is elastic supported. The comparison shows that the resonance of air in enclosure is more severe under elastic boundary on condition of same driving force. Thereby the sound pressure is higher.
Characteristic Recognition of IC Chip’s Micro-Topography Defects Based on Image Projection Transformation and Energy Optimization Modeling
Authors: Liang Zhong Wei , Zhang Chun Liang , Wang Yi Jun , Xiao Zhong Min
Published: October 2010

For accurate inspecting the micro-topography defects of IC chip, characteristic recognizing method of topography defects based on image projection transformation and energy optimization modeling is presented. First the topography conjugate images have been obtained by high-definition CCD cameras from different space positions, and then we extracting the relative positions of several selected IC defect characteristic-points, through establishing the relationship of image projecting transformation these point’s absolute three-dimensional coordinates can be calculated and determined, with energy optimization modeling the controlling curves are fitted, and then the defect topography in each enclosing spatial region which constituted by these controlling curves is structured. Mathematical characteristics are established according to the topography model, after training and adjusting BP network repeatedly the topography defects can be characteristic-recognized, and the recognizing results are gotten. In this experiment the performance comparison and analysis are implemented in several typical recognizing methods of image characteristic, which prove this new method’s accuracy and reliability and provide new idea for following IC chip’s precise detection.
Positioning of Characteristic Points in IC Chip’s Micro-Topography Based on Cross Correlation Matching and Image Projection Transformation
Authors: Liang Zhong Wei , Zhang Chun Liang , Wang Yi Jun , Hu Yi Dan
Published: October 2010

In accurate optical inspection of IC chip, it is necessary to recognize and calibrate the IC micro-topography completely and accurately. Positioning method of characteristic points in IC chip’s micro-topography based on cross correlation matching and image projection transformation is investigated to realize high precision detection of surface topography. On the basis of extracting wavelet high-frequency components of IC topography conjugate images which is shot by high- definition CCD cameras from different space positions, the coordinate information of some selected topography’s characteristic points is shown. Cross correlation matching is applied to definite the characteristic point’s relative positions in the projected images, then relationship of image projection transformation is established for calculating and determining the characteristic point’s absolute coordinates, which facilitates following topography detection of IC chip. Experiment analysis and data comparison indicate that accurate coordinate positioning results of characteristic points can be obtained by this method, the research basis for following IC topography model structuring and micro- flaw characteristic detecting can also be provided.
Research on Crack Generating in the Process of Hybrid Plasma and Laser Deposition Manufacturing
Authors: Qian Ying Ping , Zhang Xiao Wei , Zhou Xi Zhi , Zhang Hai Ou
Published: October 2010

Crack is the common drawback in deposition manufacturing process with high energy beam, which usually leads to the manufacturing process being given up halfway. So it is important and urgent to investigate the generating principle of crack and establish relative means to prevent crack appearance. In this paper, the principle of crack generating in the process of hybrid plasma and laser manufacturing was studied experimentally and systematically. The influences of power system and shielding atmosphere on crack were researched. The results were summarized as follows: (1) The crack generating in the course of manufacturing is mainly heat crack. (2) Excessive energy density and temperature will result in crack. (3) The best method preventing part being manufactured from oxidation is to put the whole part into the inert gas.
A Gait Recognition Algorithm Based on Wavelet Moment and Double Triangle Feature
Authors: Zhu Xiao Ke , Zhang Fan , Li Rui , Cui Yan Bin
Published: October 2010

In order to improve the classification rate of gait recognition, a new gait recognition algorithm is proposed. Firstly, the gait images are preprocessed, and the outlines of gait images are extracted and normalized. Secondly, wavelet moments of the outlines are calculated to describe the static feature of the gait images. Thirdly, the leg double triangle model is built. The first triangle consists of the mid-point of the two hips, left knee point and right knee point, and the other one consists of the mid-point of the two hips, left ankle point and right ankle point. Then the parameters of two triangles are extracted to describe the dynamic features of the gait images. Finally, the above two features are fused and used for the classification. The experimental results show that proposed algorithm provides higher correct classification rate than the algorithms using single feature, and meets the requirements of the real-time.
A New Grating Non-Diffracting Structured Light for Three Dimensional Shape Measurement
Authors: Chen Liang Zhou , Qu Dan , Zhou Li Ping , Gan Jiang Hong
Published: October 2010

A new method of actualizing grating non-diffracting structured light (GNSL) is proposed. The GNSL holds characters of long focal-depth, narrow strip-width, steady light field and constant light intensity in certain rang etc. Based on precise triangular-section prism, an optical system is designed and actualized experimentally. With theory analysis and calculation to the optical system, the distribution of the light intensity is simulated in non-diffracting range. Experiment results show that simulation is in good agreement with the theory calculation. According to system parameters, GNSL with 18um strip-width and 57cm non-diffracting range is produced in experimental system. Compared with traditional projected light source, GNSL has advantages of high resolution and high precision in the application of three dimensions (3D) shape measurement. By using GNSL, matching ambiguity could be reduced.
Research on the Splitting Measurement Method of Space Position in Three-Dimensional Field
Authors: Wang De Xi , Li Qin , Li Fu Bao , Li Zong Ke
Published: October 2010

A research on measurement method of space position in three-dimensional field was demonstrated in this paper. According to the basic methods and principles of three-dimensional spatial position measurement, optical path of splitting design was used to divide an object point, through the red and green filters, into two beams of red and green, and then, through flat mirror, rectangular prism, cube prism and other optical design, it imaged on the same CCD camera film. Standard mesh was used to determine the relationship between two different spatial coordinates and the spatial pixel coordinates in the measurement space, and then the calibration relationship between object point coordinates and pixel coordinates were determined. This calibration relationship clear the error caused by the method of measurement and the measurement system. Through the determination algorithm of spatial location in three-dimensional field, the two corresponding lines of space was obtained, and its point of intersection is the spatial coordinate.
Research on Image Segmentation Technique for Pebrine in Silkworm Based on HSI Model
Authors: Zhang Dao De , Hu Xin Yu , Pan Yu Rong , Yang Guang You
Published: October 2010

To segment the pebrine from the background effectively, this paper focuses on the research of image segmentation technology on the basis of HSI color model. Owing to the complex background and poor contrast of the pebrine image, the method of contrast enhancement is adopted to improve the image quality; the technology of target extraction based on HSI model is used to realize the direct extraction of the colorized object image from the background, which utilizes the color characteristic of pebrine image; Meanwhile, the research on the threshold processing on the basis of shape feature of pebrine image can be done to improve the efficiency of algorithm, which minimizes the influence of non-target image, and the method of morphology can be applied to eliminate the hole or dot noise, and to separate the adhesive pebrines, which increases the accuracy of pebrine recognition. The result shows the method reasonable and effective.
Application Research of Face Feature Extraction Based on DM642
Authors: Liu Jin Qing , Fan Qun Zhen , Cao Dong
Published: October 2010

With the safety awareness strengthened, identification authentication technology has been increasingly concerned. Face recognition is attractive in pattern recognition and artificial intelligence field, and face feature extraction is a very important part in face recognition. This paper first introduced preprocessing of face images, PCA and ICA algorithm. Considering PCA and ICA their respective strengths and weaknesses, then a novel face feature extraction method based on PCA and ICA is proposed. The NN classifier is select to face classification and recognition on the ORL face database. From the actual requirements, the paper analyses hardware platforms based on DM642, and finally use tool CCS software to optimize program and implementation base on DM642 to meet the real-time requirements. Experiments indicated that the modified method is superior to PCA and ICA algorithm.
Traditional Chinese Medicine Pulse-Condition Simulation and Wavelet Recognition Method
Authors: Cao Dong , Ye Jian Wei , Yi Jun , Ruan Wen Jie , Chen Chong
Published: October 2010

The human pulse-condition diagnosis is an important part of the traditional Chinese medicine (TCM) which is difficult to recognize accurately by doctor’s subjective experience. Objective identification of pulse-conditions has important meanings for modernization of TCM. In this paper human pulse-condition system transfer function model and model parameter estimation were introduced, which are used to construct four kinds of typical pulse-conditions simulation signals. There are normal pulse, taut pulse, slippery pulse and thready pulse. And then, discrete wavelet transform for extracting the multi-scale energy characteristics and wavelet packet decomposition for extracting the multi-band energy characteristics are proposed so as to recognize the pulse-conditions simulation signals. The results show that the recognition effect of discrete wavelet transform method is better. Moreover, the data features of characteristic parameters demonstrate the reality of simulation signals.
A New Flatness Evaluation-Rotation Method Based on GA
Authors: Jiang Yan Ming , Liu Gui Xiong
Published: October 2010

Flatness is one fundamental element of geometric forms, and the flatness evaluation is particularly important for ensuring the quality of industrial products. This paper presents a new flatness evaluation in the view of the minimum zone evaluation - rotation method based on genetic algorithm. This method determines the minimum zone through rotating measurement points in three dimensions coordinate. The points are firstly rotated about coordinate axes. Then they are projected in one axis, and the smallest projection length is the flatness value. The rotation angles are optimized by genetic algorithm to improve search efficiency. An exponential fitness function and the rotation angles range is designed on the basis of flatness characteristics. An adaptive mode of crossover and mutation probability is used to avoid local optimum. The results show this method can search the minimum zone and converge rapidly.
Design of Poultry Meat Edible Quality Detection Device Using Multiple Image Sensors
Authors: Zhao Jin Hui , Liu Mu Hua , Zhan Cheng Hui , Shen Jie , Tu Dong Cheng
Published: October 2010

A detection device was designed to detect the poultry meat edible quality. The detection device is the electromechanical integration equipment which is integrated with x-ray technology, visible light technology and induced fluorescence technology. The device not only can overcome the disadvantages that the conventional measure methods have destructiveness to the samples, and consume the long time of the detection, etc, but also can detect the multiple quality indexes simultaneously. The detection device is composed of the frames, the transmission control system, the X-ray detection system, the visible light detection system and the induced fluorescence detection system, etc. The device can greatly increase the judging ability for comprehensive quality of poultry meat and realize the fast and non-destructive testing to poultry meat edible quality.
Low-Cost Optical Measurement for Micro-Displacement with High Accuracy
Authors: Lu Qing Hua , Zhang Xian Min , Fan Yan Bin
Published: October 2010

Micro-displacement measurement with high accuracy plays a vital role in micro/nano manufacturing technology. In this paper, three low-cost techniques for micro-displacement measurement with high accuracy are discussed, and they are the methods based on DVD optical head, burred images and stop-action images. The techniques based on the DVD optical head and burred images are very attractive for many applications where the low cost is indispensable, and the method based on stop-action images has also better performance when measuring the static micro-displacement. Then, an application based on the stop-action images approach is given, and this method can measure the micro-displacement with nanometer accuracy. In addition, these discussions show that the methods based on the DVD optical head and burred images are a possible direction for low-cost micro-displacement measurement with high accuracy.
Stereo Matching Algorithm Based on Phase Dynamic Programming in 3D Profile Measurement
Authors: Liu Xiao Hui , Jiang Kai Yong , Lin Jun Yi
Published: October 2010

A New Stereo Matching Method Based Phase Dynamic Programming (PDP) is presented in this paper. This method, based on gray code value and phase value, implements stereo matching through finding an optimal path on a 2D plane composed of cross phase absolute difference in the same gray region. Before matching, mask-image is adopted to reduce matching data point. During matching, the matching strategy is optimized by adopting sequence consistency technique as well as defining the path orientation. After matching, the error data point is eliminated by matching consistency and median filtering based disparity. Finally, experimental results show this algorithm can get a better performance. Matching process of PDP is simple but effective than others. It not only can get continuous and dense parallax but also eliminate effects of noise and the reconstructive object has high reliability, better authenticity and high precision.
Experimental Research of Prestrain Effects on Mechanical Behavior of Dual Phase Steel
Authors: Meng Jin , Zhu Ping , Hu Zhi Gang
Published: October 2010

Dual phase (DP) steel is increasingly utilized in automotive industry to match the requirement of both performance and lightweight of autobody for economical and ecological considerations. Most of autobody structures are manufactured by stamping process which imports prestrain effects into original material and alters its static and cyclic mechanical behaviors. In this study, mechanical behavior of prestrained DP steel was researched. Firstly, microstructure of commercial DP steel with different prestrain levels was examined with optical microscope of 500X magnification. Then, static tensile experiments and strain-controlled fatigue experiments were carried out at room temperature. Test results of differenet prestrain levels were compared. Static stress-strain relationship and local strain-life model were determined using linear regression method. Furthermore, fatigue performance and notch fatigue resistance capability were compared with prestrain level based on Neuber factor. Finally, explanation of the change with prestrain was presented with crack closure theory.
Skeleton-Based Feature Extraction Method for Two-Dimensional Potential Energy
Authors: Chen Xue Song , Wang Cheng , Xu Xue Jun , Zhu Hong Bo , Jiang Shao Hua
Published: October 2010

A good feature extraction method can improve the performance of pattern recognition system or classification system. Using potential energy theory into binary image feature extraction and feature store is a new method for image processing. The skeleton can be better display the whole features of the object. In target recognition system, using potential energy of skeleton-point projection into the plane coordinate system. The method can be better to show a skeleton in the structural feature. In addition, it can better avoid the matrix storage redundancy. In all energy projection method, potential energy projection is better shown its superiority in the structure information, the time of consumption and the storage space. The skeleton potential energy can be used in target recognition and target classification field and so on.