bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of CeO2 Addition on Microstructure of Vacuum-Melting WC-Ni Base Alloy Coating
Authors: Wang Ya Nan , Miao Lu , Geng Wei , Cai Chuan Bo
Published: July 2011

Samples of CeO2-WC- Ni base alloy coating were made on 45# steel substrate by vacuum melting. The influence of CeO2addition on microstructure of longitudinal section of coatings, elements diffusion at the junction, and WC morphology and distribution was analyzed by scanning electron microscopy and energy dispersive spectroscopy. The results showed as follows: with 0.75% CeO2addition, the coating best combined with the substrate and had least pores, cracks and other defects; CeO2played a significant role in promoting the diffusion of alloying elements (mainly Fe, Ni diffusion at the junction); CeO2changed the morphology and distribution of WC hard phase in the coating, making it small, uniform, and dispersed, and promoting the diffusion between Ni-based alloy and WC in the coating.
Microstructure and Properties of Electrospark Deposition Coating on Die Steel
Authors: Gao Yu Xin , Zhao Cheng
Published: July 2011

Superfine coatings have been prepared by Electro-spark deposition (ESD) on die steel substrate with WC-8Co electrode. The microstructures and abrasion performance of the coating were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and microhardness tester. The results show that ultra-fine particles prevail in the coating. The primary phases of the coating contain Fe3W3C, Co3W3C, Fe7W6 and W2C. The maximum microhardness reaches 1432.5 HV0.3. The results of abrasive test demonstrated that the coating had an excellent sliding wear resistance because the superfine particles distributed dispersedly in the coating increased the resistance to micro-cutting and plowing during the wear test, which effectively improves the surface performance of die steel substrate.
Synthesis Research of Corrosion Inhibitor Similar to Polyepoxysuccinic Acid for Carbon Steel in Sea Water
Authors: Ma Qing Guo , Zhang Xue Li , Han Li Hua
Published: July 2011

A green corrosion inhibitor similar to polyepoxysuccinic acid is synthesized by using maleic anhydride and sodium allylsulfonate as raw material. The molecular structure is characterized by IR spectra. The efficiency of an environmental-friendly corrosion inhibitor for carbon steel in sea water is researched through method of weight loss. This new corrosion inhibitor is a mixture of multipolymer, Zn2+ and HEDP. The efficiency of the corrosion inhibitor for carbon steel in the sea water is 97.68%, when the concentration of multipolymer is 50mg/L, Zn2+ is 4mg/L, HEDP is 10mg/L. The surface of carbon steel is investigated by electron microscopy after the experiment of corrosion, and the mechanism of corrosion inhibitor is discussed.
Subdivision of Machining Stable Region Based on Vibration Frequencies
Authors: Song Qing Hua , Ai Xing
Published: July 2011

Vibration frequencies during high-speed milling processes are investigated. Based on the resonant theory and three critical stats of phase position of successive two cutter teeth, six kinds of spindle speeds are shown, which divide the stable region in stability limit diagram into four parts. Furthermore, using optimal control theory, a novel stable region is proposed, which divides the region into three parts (unconditional stable, optimal stable, and conditional stable region).
The Optimization of a Middle-Sized Passenger Car Steering Wheel Vibration at Idle Speed
Authors: Su Lang , Zhou Hong , Zhu Lin Sen
Published: July 2011

In this paper, based on the study of steering wheel vibration problem of a middle-sized passenger car under idle condition, the reason is found out with the help of testing and analyzing, and the result shows that it is its first-order natural frequency, which is too close to the engine’s second-order frequency under idle condition that causes resonance. Through the optimization of the steering column system the problem is solved, and a satisfying result is obtained.
Application of Ant Colony Algorithm in Fault Diagnosis of Roller Bearing
Authors: Song Liu Yang , Wang Hua Qing , Pan Jia , Gao Jin Ji , Li Ke
Published: July 2011

This paper presents a condition diagnosis method for a roller bearing using the ant colony optimization (ACO). The symptom parameters in frequency domain are considered for reflecting the feature of vibration signals measured under different states. The states identification for machinery diagnosis is converted to clustering problem of different states. The distance-based diagnosis method, which distinguishes the machinery states by comparing the distance, is proposed using the ACO clustering algorithm and utilized to detect faults and recognize fault types. The analysis results demonstrate that the proposed method can recognize the faults types effectively.
Acoustic Radiation Simulation of Marine Sliding-Thrust Bearing Shell Based on SYSNOISE
Authors: Zhao Guang Liang
Published: July 2011

This paper takes marine Kingsbury sliding thrust bearing as the research object and conducts the finite element dynamic analysis with the aid of ANSYS software. On this basis, the acoustic boundary element model of a sliding thrust bearing shell is established with the ANSYS dynamic analysis results as the boundary excitation conditions. Besides, the radiated sound power of the shell is calculated by indirect boundary element method in SYNOSISE software. The influence of different condition parameters on the radiated sound power of the shell is perceived through the analysis of several rotation-thrust conditions. As for the special structure of this kind of sliding-thrust bearing, this paper states the impact of the supporting structure performance parameters, the pad number and damp of shell on the shell radiated sound power. The optimized measure for the supporting structure and the plan concerning the pad number’s selection lays the theoretical basis for damping and noise-reducing research on marine sliding-thrust bearing and its rotor system.
Performance Testing for Bamboo Charcoal Knitting Fabrics of Different Structures
Authors: Qiu Yu Ying
Published: July 2011

In this paper, the eco combination yarns of bamboo carbon fiber and cotton fiber which have the same yarn count are used to knit four structures by computerized flat knitting machine such as plain jersey, half cardigan stitch, milano rib stitch and half-milano rib stitch. Through testing, comparing and analyzing on drape, air permeability, moisture absorption and bursting strength, the results show that the plain jersey knitted products are the best.
Displacement Governing Equations of Moderately Thick Cylindrical Shallow Shells by Transverse Shearing Deformation and the General Solution
Authors: Huang Hui Rong , Hao Ji Ping , Zhang Hai Xia , Huang Yi
Published: July 2011

Displacement fundamental equations of the moderately thick cylindrical shallow shells concerning five independent variables, i.e. five middle surface displacements are established based on the displacement fundamental equations of the moderately thick shells by transverse shearing deformation and basic hypothesis on shallow shells. Three assistant displacement functions are introduced to solve the equations, which are tenth-order differential equations with variable coefficient; and then five second-order differential equations are converted into a second-order differential equation and two fourth-order transition differential equations using the Cauchy-Riemann condition, afterwards another assistant displacement function is introduced to build its decoupled governing differential equations, finally five displacement components through four assistant displacement functions are obtained.
Displacement Fundamental Equations and Analysis of Governing Equations of the Circular Moderately Thick Shallow Spherical Shells
Authors: Huang Hui Rong , Hao Ji Ping , Zhang Hai Xia , Huang Yi
Published: July 2011

Displacement fundamental equations of moderately thick shallow spherical shells in polar coordinates concerning five independent variables, i.e. five middle surface displacements are established, based on the displacement fundamental equations of the moderately thick shells by transverse shearing deformation and basic hypothesis on shallow shells. Four assistant displacement functions are introduced to solve displacement fundamental equations of circular moderately thick shallow spherical shells , which are tenth-order differential equations with variable coefficient, then the decoupled governing differential equations are built up, and five displacement components through four assistant displacement functions are obtained.
The Denoising Method for Transient Speed Signal of Diesel Engine
Authors: Pan Jin Feng , Zhang Yan
Published: July 2011

A new denoising method for the diesel engine transient speed signal was proposed, especially for the signal seriously corrupted by impulsive noises. This method takes two steps. The first step is to do impulsive noise removing. An improved differential rank impulse detector was used to do impulsive noise detection in this paper. After the impulsive noise was detected, it was replaced by the median value of the window it was in. Then the second step low pass filtering is taking on. Experiments show that the proposed method could remove the noise of the acquired diesel transient speed signals effectively, the denoised signal could reflect the real working conditions of the diesel engine.
Test Verification of a Design Method for a Fluid Viscous Damper
Authors: Jia Jiu Hong , Hua Hong Xing
Published: July 2011

Vibration protection of pipes in nuclear power plants is a critical factor for the safety of the whole plant. In order to improve the anti-shock ability of pipes in nuclear power plants, the application feasibility of the fluid viscous damper in the plant piping protection is investigated. Then a damper design model intended to be used in nuclear power plants is researched by shock tests. Moreover, the parameters in the mathematical model are analyzed. From the analysis results, the conclusion can be drawn that the design method can be used to calculate the physical dimensions of dampers.
Effect of Additives on Photo-Aging Performance of Polyurethane Coating
Authors: Xiang Bin , Zhu Ren Qing , He Hai Yun , Xu Zhong Cheng , Chen Shi
Published: July 2011

Polyurethane (PU) coatings with additives, such as UV-curing monomers and oligomers, ultraviolet absorbing (UVA) and hindered amine (HALS), were accelerated with Xenon lamp to study the effect of additives on photo aging performance of PU coatings. The ageing behavior of samples was evaluated with gloss-meter, chromatic meter, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM).The results indicated that the anti-aging of coating was improved by the synergy effect of 1.5wt.% HALS(Tinuvin 292), 3wt.% UV-curing resin (611B-85) and 1wt.% UVA(UV1130).
The Corrosion Behavior of Ni-P/SiC Composite Coating
Authors: Yang Gui Rong , Song Wen Ming , Sun Xian Ming , Ma Ying , Hao Yuan
Published: July 2011

The Ni-P/SiC composite coating was prepared by chemical deposition technique. The corrosion behavior of electroless Ni-P/SiC composite coating was investigated. The results show that the corrosion resistance of electroless composite coating decreased with the increasing SiC concentration in bath solution. There were some little pores among the composite coating and the pores would increased with the increasing SiC content among the coating, which made the corrosion resistance decreased. The corrosion rate increased with the increasing temperature of corrosion liquid. The corrosion resistance was improved for T gradient electroless Ni-P/SiC composite coating comparing with the single electroless composite coating whether the corrosion solution was acid solution or alkaline solution. The corrosion rate were less than 5 mg/cm2for all specimens in alkaline solution, which indicated that the corrosion resistance of electroless composite coating was better than that in acid solution.
Research on Multi-Excitation Source United Controlling Test Method Based on Distributed Actuation
Authors: Yao Jun , Wu Yan Fei , Xu Ming Ge
Published: July 2011

In view of the questions of high-speed aircraft withstanding complicated vibration environment, their vibration durability could not being plenary examined by existing vibration test technology, a vibration test technique integrating piezoelectric element, vibrating table, exciter is proposed. The vibration environment dimension of high-speed aircraft and its influence to the failures of high-speed aircraft are analysed. Based on the research on the material and actuation dimension of the piezoelectric element, the feasibility of piezoelectric element used as the distributed excitation source in vibration test is analysed. Last, a test demonstration system is constituted and a serials of test items are carried out. The rationality and the extensive engineering application potential of this technique are verified by the test results.
Local Monte Carlo Simulation for the Reliability Sensitivity Analysis
Authors: Li Da Wei , Lu Zhen Zhou , Tang Zhang Chun
Published: July 2011

An efficient numerical technique, namely the Local Monte Carlo Simulation method, is presented to assess the reliability sensitivity in this paper. Firstly some samples are obtained by the random sampling, then the local domain with a constant probability content corresponding to each sample point can be defined, finally the conditional reliability and reliability sensitivity corresponding to every local region can be calculated by using linear approximation of the limit state function. The reliability and reliability sensitivity can be estimated by the expectation of all the conditional reliability and reliability sensitivity. Three examples testify the applicability, validity and accuracy of the proposed method. The results computed by the Local Monte Carlo Simulation method and the Monte Carlo method are compared, which demonstrates that, without losing precision, the computational cost by the former method is much less than the later.
Important Sampling for Structural Reliability Based on Radial Basis Function Neural Network
Authors: Gao Li Hong , Xu Ge Ning , Yang Ping
Published: July 2011

The methods of the structural reliability mainly involve analytical approximate reliability index or numerical simulation, which using the finite element solver is time-consuming and large computation. Important sampling (IS) for structural reliability analysis based on radial basis functions neural network (RBFNN) is proposed in the paper, in which trained RBFNN can model the implicit function between the structure response and input random variables. And limit state function of structure is simulated with RBFNN model applied to calculate the design point. The results show that the RBFNN can simulate the limit state functions of structures. Besides, calculation procedure based on finite element solver for structural analysis is greatly reduced and the efficiency in structural reliability evaluation is improved.
Maximum-Likelihood Estimation of the Parameters with Constraints in Step-Stress Accelerated Life Tests
Authors: Xing Yu Hong , Liu Rui Yuan
Published: July 2011

This paper investigates the maximum likelihood estimation of the average lifespan of products with the constraints, and the estimation of the average lifespan at stress level, which follows the exponential distribution, is derived by transforming the time-censoring step-stress accelerated life test data into the corresponding constant-stress accelerated life test data. The proposed method can overcome the shortcoming of information lose.
Research on the Method of Class_A Surface Reconstruction in Automotive Body External Panel Design
Authors: Cao Ya Bin
Published: July 2011

Class_A surface reconstruction is a key part in the design of automotive body external panel. Traditional methods of Class_A surface reconstruction have some disadvantages such as low efficiency, bad flexibility and low surface quality in complicated surface reconstruction. In this paper, a method of Class_A surface reconstruction from point clouds based on NURBS patch was presented, which made surface design more flexible and direct, besides, the reconstruction efficiency and surface quality were improved.
Simulation and Analysis of Frame Structure of Military Transport Truck
Authors: Yao Guo Nian , Huang Hai Ying , Wang Li Juan
Published: July 2011

In order to design the vibrator with the similar structure to military transport truck, which will be used in simulating transport environment and evaluating the transportation properties of the tested product, three-dimension model of overall structure of truck frame, crossbeams and floor is established with ADAMS/View based on multi-body dynamics theory and virtual prototyping technology. Post-processing of the simulation and analysis results is executed with ADAMS/Post Processor module with a military truck model in the study. According to the bump of vehicle during transport and the chassis vibration, the constraints, force and motion accord with the actual transport are put on the model. Vibration modes of all orders and the spectrum are gained and analyzed in detail. The results indicate that the simulation is consistent with the actual transport, which shows the simulation of the overall frame structure owns high credibility.
The Geometric Modeling of Pieces in Virtual Milling Simulation
Authors: Bi Hai Xia , Li Shi Jie , Zhang Yan Rui
Published: July 2011

The process simulation of virtual machining is the key technique in the CNC simulation system. So the paper talks about some useful geometric modeling techniques in simulation field, and bring forward an improved object-space separating modeling technique based on the idea of Dexel and the data-type of Z-MAP, which is a kind of geometric modeling for pieces for milling process simulation. This method is to a certain degree reduced calculation quantities in simulation, increased the speed of simulation and optimized the effect of simulation.
Study on Mechanism of Hammer Bit and Rock Interaction in Geophysical Prospecting Percussion Drilling
Authors: Huang Zhi Qiang , Li Qin , Fan Yong Tao , Wei Zhen Qiang , Zhu Hai Yan
Published: July 2011

Percussion drilling has been widely used in oil and gas industry, yet it still has some shortcomings, such as severe damages to drilling tools, low energy transferring efficiency and low rock-fragmenting efficiency. Thus it is necessary to reveal the mechanism of interactions between the hammer bit and rock in geophysical prospecting percussion drilling. Taking account of the coupling effect of the Weight on Bit (WOB), impact force and rotary torque, this paper constructed a Finite Element Method (FEM) model using the finite element analysis software (ANSYS/LS-DYNA) and conducted a computer simulation of bit-rock interaction under rotating and simple impact effect, which showed the rock-fragmenting process of hammer bit and the curves of volume-time and depth-time of craters as well as the effective stress-time curves of the centre tooth, second-row tooth and peripheral tooth. The results showed that: the percussion drilling process under rotating impact effect is characterized as four fundamental processes; the crater depth mainly depends on impact force rather than rotary torque; the crater created under rotating impact effect is twice the volume of that under impact effect; the effective stress of each tooth changes severely: the stress of second-row tooth is the largest, centre tooth the second, and peripheral tooth the smallest. This study provided a guide for the structural optimization of hammer bit and general applications of percussion drilling.
Study of FPBS Model for Conceptual Design of Mechanical Product
Authors: Liu Kang , Li Yan , Zhao Wu , Li Wen Qiang
Published: July 2011

A process model FPBS for conceptual design is put forward. The function and behavior etc about the model are defined and analyzed, and the expressions are analyzed too. The relationships of elements, the application of model are discussed and analyzed. The model can be effective used to guide conceptual design and applied to construct computer aided conceptual design system.
An Automotive Die Face Compensation Method Considering Blank Thinning and Die Deformation
Authors: Men Chang Feng , Yu Qiang , Miao De Hua , Cai Yu Jun
Published: July 2011

In this paper, the thinning rate and die elastic deformation under large forming force are investigated by finite element simulation with experimental validation focused on the problem of coloring rate between die and panel in automotive die manufacturing. The study suggests that when the panel is formed, the thinning rate of panel has little influence on the coloring rate and the die elastic deformation under large forming force is the main influence factor. The contact pressure of die face and punch surface displacement distribution under forming force are got with simulation. With these results the method that die face is compensated reasonably is also proposed. The industrial application shows that the method can reduce the die polishing workloads obviously compared to the traditional method of die face equivalent offset. This paper has a guide for comprehensive understanding the influence factors of coloring rate and greatly reducing the die tryout period.
Random Vibration Analysis of the Deployable Structure for Satellite Antenna
Authors: Zou Qing , Wu Guang Liang , Hu Yong , Liu Xiao Guang , Wei Fu Yu , Li Jing , Wang Hong Jian , Li Bin , Zhang Sheng Wei , Li Xiao Peng
Published: July 2011

In this paper, the random vibration theory based on the finite element is briefly described; the appropriate finite element model of the Deployable Structure for Satellite Antenna (DSSA) is created. In order to assess the random vibration characteristic and the performance of the DSSA in the dynamic environment, the responses of the DSSA are analyzed. The responses are obtained by the respective random vibration analysis of X, Y, and Z directions, and by the analysis of the root mean square and the power spectrum density of the acceleration response. The results show that, although the DSSA can bear the random vibration load, the structural weaknesses are existence. This provides some references to the formal design of the DSSA.
Application of Computer and Network Technology in Welding Power Source Design
Authors: Dai Le Yi , Zhu Jin Hong , Shi Hong Xin
Published: July 2011

Welding power source is an important research content in the field of welding technology. It is of significance to organize the design database of welding power source, develop its interactive website and construct its remote management platform based on web. In the scope of this paper, the core technology applied in above aspects were analyzed and summarized, the current development status and future trend of the application of computer and internet technology in welding power source areas were introduced.
Application of Computer Simulation Technology in the Analysis for Gilling Machine Structure
Authors: Pan Li Jiao , Yu Zi Tang , He Yong Ming
Published: July 2011

The application of computer simulation technology in engineering design and analysis fields can effectively reduce product production cost, and improve the design efficiency. Through the computer simulation analysis of the key structure of gilling machine, the maximum stress value and its position of the working screw can be obtained in the working condition when roller’s linear velocity are at 1st and 2nd gear ratio, respectively, about 66.0m/min and 57.0m/min. In addition, in the assembly model simulation analysis of gilling machine structure, the influence of prestress simulation is considered and obtained the first 4 order’s natural frequencies and mode shapes in two kinds of gear ratios in those working conditions. It provides some suggestions that can be used to research the effect factors of gilling machine design, the gilling machine structure optimization and operating mode control.
Human Dimension and its Application in Product Design
Authors: Luo Bi Juan , Li Yong Quan , Wang Li
Published: July 2011

Human design is an inevitable trend and development in product design. To achieve the goal of human design, master's physiology, psychology, design data is key data that must be followed. Among them, the body size of the designer to determine is an important basis for product dimensions. The article first analyzes the characteristics of the body size, application method of body size and application procedures, finally, small kitchen appliances storage cabinets design as an example, analyzing the appliances the body size in the product design.
Discussion on the Transportation Speed of the Horizontally Vibrating Conveyor
Authors: He Yu Min , Liu Qiang , Lin Yun , Zhang Xiao Long
Published: July 2011

The vibration of the horizontally vibrating conveyor (HVC) is excited by a vibration generator with four shafts which have eccentric quality. HVC makes the lump material to go forward by friction between the materiel and conveying trough. In this paper, a method based on the discreteness of time is adopted, and the influences factors of the transportation speed of HVC are discussed.
CFD Modeling of Flow Performance inside Subsonic Centrifugal Compressor
Authors: Wang Yu , Luo Zhen
Published: July 2011

Centrifugal Compressors, which offer good flow stability, compact size and high stage pressure ratio, have been widely used in helicopter engines and sometime served as high pressure stage in small turbojet engines. In this paper, a method of developing a CFD model is presented for investigating the flow performance of a subsonic centrifugal compressor. The configuration used for the study is a subsonic centrifugal compressor which has a 60mm diameter impeller. A CFD modeling is carried out to obtain the performance and operational range of the compressor stage. The mesh independence studies were performed to provide confidence in the numerical results at operation speed. Particular emphasis is laid on the flow performance analysis with designed rotational speed of impeller.
Conceptual Design Methodology of Mechatronic Systems
Authors: Xu Yong
Published: July 2011

The “integration” in mechatronics does not concern only the technology but it implies an integration of design methods as well. There is a need for methods to model the functionality in a homogeneous way independently of implementation technology. Interdisciplinary knowledge, methodology and reference models are pointed out as factors that improve the design work of a mechatronic system, and a solution for the methodology and reference models was proposed.
Optimization of Extraction Conditions of Active Constituents from Siraitia Grosvenorii
Authors: Liu Jing , Rong Long , Liu Can , Rong Yong Hai
Published: July 2011

The conditions of cascade extraction and isolation of some active constituents from Siraitia grosvenorii were optimized. The active constituents were extracted by ultrasonic extraction and isolated by chromatography; the obtained active constituents were determined by HPLC and/or spectrophotometry etc. The yields of the active constituents were as follows, mogroside 3.97% (purity 91.84%), polyphenol 3.45%, free polysaccharide 12.53%, free oligosaccharide 11.96%, combined polysaccharide 2.29%, combined oligosaccharide 2.88%, amino acids 6.54% and alkaloid 7.06%. This extraction process could be used as a guideline for the multi-utilization of Siraitia grosvenorii.
Hydrodynamic Analysis of Oil Storage Vessels for National Strategic Petroleum Reserve
Authors: Zhai Gang Jun , Cheng Yong , Wang Wen Hua , Huang Yi
Published: July 2011

This paper expatiates hydrodynamic time-domain analysis on strategic oil storage vessels in free floating condition or with dolphin-fender mooring system by means of AQWA numerical software. The results indicate that motion responses of the oil storage vessel with dolphin-fender mooring have improved significantly. The time-history of wave diffraction forces in incident wave direction are basically consistent between the free floating and moored condition. However, in vertical direction of incident wave, the diffraction wave force of the oil storage vessel in free floating condition is obviously different from that with mooring system, which is the result of the coupling interaction between dolphin and vessels. Mooring forces include fender reaction and cable tension, as for which dominate, it depend on evocable motion responses about incident wave direction.
The Reflector Bracket Mirror Structure Optimization and Design of the IR Warring System
Authors: Wang Bing , Chen Zhao Bing
Published: July 2011

This paper introduced a kind of reflector mirror support structure of IRST system. The scanning reflector mirror support frame material is Ly2 aluminum under the principle of the suited of material expanding quotient. The support form of the reflector was talked, and the system bracket structure was designed following the requests of the certain complex IRST. The bracket was optimized and analyzed under the best structure quality and the least moment of inertia, and the bellowing of bracket plane thickness, mode frequency restriction and deadweight restriction. From the result we can see that the bracket mass can reduce from 0.73kg to 0.49kg and the moment of inertia can reduce from 0.0109kg㎡ to 0.0056 kg㎡ under the first precondition of the structure mode frequency being low and the biggest transmogrification being teeny. The base frequency and intension of the complex IRST system can be indicated well after the finite element analysis static checking.
Topological Optimization Design for Pedestal of Horizontal Rocket Rivet Fixture
Authors: Li Zhou Yang , Gu Wen Tao , Wang Ming Jun , Lei Yan Ni
Published: July 2011

In order to improve the riveting precision, the finite element method and topological optimization design based on the variable density method were employed to design the pedestal of horizontal rocket rivet fixture. Topological optimization model was set up based on static analysis of the original designed pedestal under various typical load cases. Topological optimization results of various load cases were compared with original pedestal. The result showed deficiencies of the original pedestal, and a new model was built based on topological optimization results. The analysis of topological model was carried out by applying the finite element method. The results show that the stiffness of pedestal was remarkably improved; the stress distribution was more homogenized and the displacement of the guide rail was decreased after optimization. This method could also provide reference and guidance for designing other complicated structures.
2-D Circle Measurement System for Small Rule Parts Based on Machine Vision
Authors: Wu Qing Hua , Dai Na , He Tao
Published: July 2011

A Circle-shape is an important figure in most small rule mechanical parts, and usually be measured to get the radius or used as a stand calibration mark. In this paper, a 2-D circle measurement system for small rule mechanical parts based on machine vision is designed and built. The basic components and work principle of the machine vision measurement system are introduced, and the measurement produce is designed and discussed. An available algorithm for circle contour detected and fitted is described. Using this algorithm, the measurement software flow and architecture are built and the software system realized in the Microsoft visual studio program platform. Certainly, the calibration of machine vision system is introduced also. Using the system and method introduced above, an experiment is designed to measure the outer ring radius of one certain model bearing. The measured data is processed and analyzed. Through the experiment and result, it can be found that the measurement system can get relatively high precision and the measurement method is relatively steady, and the system precision and speed can be suit for the demand of on-line and real-time circle measurement.
Measuring Method for Differential Sensing Gratings Modulated with Matching Grating
Authors: Shao Jun , Liu Jun Hua , Qiao Xue Guang , Jia Zhen An
Published: July 2011

In order to increase the sensitivity, a new measuring method is proposed that two sensing fiber gratings change differentially modulated with a matching grating. The simulation of this method indicates that it can raise the sensitivity one time higher than that of a sensing fiber grating, as well as restrict the effect of temperature.
Algorithm Considering Signal Correlation for Denoising of the Magnetic Flux Leakage of Wire Rope
Authors: Zhan Wei Xia , Tan Ji Wen , Wen Yan
Published: July 2011

In order to suppress the noise in the magnetic flux leakage, the algorithm considering signal correlation, in which an optimal predictor and an optimal updater were chosen for every sample at all scales according to the magnitude of the correlation coefficient, was proposed. So the wavelets obtained through designing predictor and updater can perfectly fit the local features of signal. The actually processing effect of the simulation and the magnetic flux leakage signal of damage in wire rope show that the proposed method, compared with the classical wavelet, can effectively remove noise in original signal and principally retain the local features of the original signal.
Design and Implementation of SPI Communication Based-On FPGA
Authors: Tian Xiao Chun , Li Jie , Fan Yu Bao , Yu Xi Ning , Liu Jun
Published: July 2011

SPI (Serial Peripheral Interface) is a full-duplex serial communication interface bus. Now, many devices adopt SPI. However, in many other aspects, microcontroller and microprocessor have no SPI interface, data transmission is inconvenient. With the development of FPGA technology, the problem can be solved absolutely by the I/O port of FPGA. In this paper, after introducing the principle of SPI, we designed SPI interface with FPGA and implemented the communication between SPI interface and the device of CRG20 which has a SPI interface. The algorithm of design SPI interface through FPGA is implemented with VHDL. The results of simulation in Quartus II and FPGA simulation are also described. The SPI bus interface modules fulfill the goal demanded.
Research and Application on Controllable Starting Circumstance of Trough and Flexible Rubber Transfer
Authors: An Dao Xing , Geng Bao Guang , Song Hong
Published: July 2011

As the development of the coal producing, the flexible rubber transfer with long distance, high speed and power were used in most of the high productive mines in China. However, large tension was caused by the high speed moving, which resulted in sliding. The large addition Displacement and shock was to influence the normal work. Therefore, a special design with controllable start is able to fulfill the requirement.
Virtual Reality Based Auxiliary Robot System for Liver
Authors: Xie Xiao Hui , Zhao Cui Cui , Du Ru Xu , Yu Xiao Fang , Zhang Yue
Published: July 2011

During the liver intervention surgery, the excellent doctor with the help of CT image need puncture the patient several times to find the correct tumor position. Thus, the pain increases for the patient. For the problem a low-cost auxiliary robot system with the help of virtual reality technology for liver invasion surgery is introduced. The auxiliary arm can indicate the punctuation path for doctor and the virtual reality system can find the difference between the planning path of simulation and actual indication path of robot. Then the error can be compensated by modifying and updating the simulation model. Thus the system based on virtual reality is more accuracy and more effective.
The Analysis and Improvement of S-MAC Protocol for Wireless Sensor Networks
Authors: Lu Jian Qiang , Wang Wei Xing , Lin Zuan Hui
Published: July 2011

Nowadays Wireless Sensor Networks (WSN) has been widely used because of its adaptability, mobility and scalability. The MAC protocol is one of the most important network protocols which guarantee the WSN communication efficiency. The major concern of this paper is the typical contention-based MAC protocol in WSN—the S-MAC protocol. Considering the backoff algorithm of S-MAC protocol cannot resolve the fairness problem for nodes communication, the BDQR (Backoff Depends on Queue and Retry) backoff algorithm was presented in this paper. The experimental results demonstrated that by using this algorithm, nodes communication fairness was improved, channel collisions were reduced while network lifespan was prolonged.
The High-Precision Relative Rotational Speed Measurement System Based on Magnetic Signal and Spectrum Correction
Authors: Chen Guo Bin , Zhang Xiao Ming , Cui Xing , Li Yong Hui , Liu Jun
Published: July 2011

A kind of relative rotational speed measurement system based on magnetic signal and spectrum correction should be proposed for the most of current methods of relative rotational speed measurement cannot meet the measurement requirement of small size, high overload resistance in the military and industrial fields. The system collects the fixed length of time asymmetric periodic intensity signal of magnetic induction based on the characteristics of magnetoresistive sensor’s non-contact measurement, and then analyze the signal spectrum by FFT in order to obtain the accurate main frequency components in the frequency domain after the spectrum correction. The system can determine the direction of the relative rotation by detecting the waveform in the time-domain.
Study on PIDNN-Based Flow Control in Layered Water Injection Technology in Oilfield
Authors: Jia De Li , Wang Feng Shan , Xu De Kui
Published: July 2011

This paper takes the layered water injection technology in oil production engineering as research object. This technology is characterized by strong nonlinearity, strong interlayer interference, time variation and complex model. Focusing on these characteristics, this paper proposes a novel control strategy based on PID-NN algorithm to satisfy the requirements of layered water injection technology. Many performance indexes of the controller are optimized, including model establishment of nonlinear controlled object, multi-parameter decoupling, controller acceleration and precision improvement. The simulation and experiment show that compared with traditional controller based on PID and controller based on BP neural network, the optimized controller has stronger robustness, faster response and better flow control, so it has an advantage over traditional controllers of dealing with discrete events and multi-variable decoupling problems.
A Design of Sheet Metal Handing Manipulator Based on PLC
Authors: Huang Peng Peng , Chen Jian Fu , Lei Qiang
Published: July 2011

According to the work requirements of a production line of sheet metal handling, using the mechanical design principles and methods, pneumatic technology and PLC control technology for sheet metal handling manipulator research and design, and development a style of automatic handling manipulator meeting the requirements. This article introduced the sheet metal handling manipulator and principles of the basic structure of the hand, pneumatic systems and PLC control system design and analysis. Practice shows that the manipulator has a simple structure, reliable, efficient features, which meet actual production needs.
An Improved Optimization Method on the Material Mixture Ratio of Ship Stern Bearing
Authors: Li Wen , Xiao You An
Published: July 2011

An improved optimization method on the material mixture ratio of ship stern bearing is proposed. During the optimized experiment of ship stern bearing material mixture ratio, uniform design and partial least-squares regression are used to extract the regression function between the optimization object factors (including friction coefficient of the stern bearings, abrasion loss in unit time)which can evaluate the performance of ship stern bearing material mixture ratio and the other experimental factors(including the material mixture ratios of stern bearing components, stern bearing processing temperature).The total optimization object function is composed by the proper weighting to these obtained regression functions.The optimized material mixture ratio will be attained when the comprehensive evaluation index which is the value of the total optimization object function gets its optimum value. Through an analytical comparison with existing optimization method , the improved optimization method can greatly reduce testing times and the experimental cost, shorten the experiment period in the allowed precision range. Based on the experimental analysis of a technology simulation model of related ship stern bearing, it shows that the improved optimization method is practicable and effective.
Study on Control Strategy of Train Automatic Speed Control System
Authors: Yu Jian Zhi , Chen Yong Sheng
Published: July 2011

To improve the efficiency of the automatic control in the process of train operation, reduce state transition caused by the signal interference and guarantee the safe operation of automatic train operation system, a kind of train automatic speed control strategy based on the fuzzy-predictive control algorithm is put forward. According to the dual-redundant control model, the reliability and safety of the train automatic speed control system is analyzed. Using anti-interference design, a series of model simulations have been accomplished. The results show that the system has good reliability.
An Improved H.264 Codec Algorithm Based on Regions of Interest
Authors: Wang Zheng You , Li Zhen Xing , Ming Jian Hua
Published: July 2011

Because observers’ attention to the region of interest is higher than other parts (the background) of the image , This paper discribes an improved H.264 codec algorithm based on regions of interest. This method according to the degree of regional interest, adjusting the quantization step size, quantified the region of interest in detailed, and coarsely quantized other regions. ROI information was transmitted to the decoder and then carried out corresponding inverse quantization. Experimental results show that the output bit rate was decreased of 10% -20% by using this improved algorithm in H.264 reference encoder, but the subjective quality of decoded image is as good as the standard H.264 encoders.
A Collision Avoidance System for Dam Concrete Construction Based on GPS and GIS
Authors: Wu Hao , Tao Jing , Li Xin Ping , Chi Xiu Wen , Chen Nan , Li Hua
Published: July 2011

It is necessary for dam concrete construction to take some measures to avoid large haulage equipment collision accident. A collision avoidance system based on GPS and GIS is established in order to reduce this accident with providing accurately monitoring and controlling in real time. In this paper, the function design of collision avoidance is detailed discussed, and the integrity of the system is verified through application used in Dagan Mountain dam concreting construction.
Design of Live Video Monitoring System Based on DM642
Authors: Liu Jin Qing , Fan Qun Zhen
Published: July 2011

This paper adopts high-speed fixed-point signal processor TMS320DM64 produced by TI company, XC2S150 chip FPGA produced by Xilinx company, video front-end decoder chip SAA7111 and back-end encoding chip AL250 new launched by PHILIP company, which constituted a high-speed, intelligent live video monitoring system. The system video image transmission of strong real-time, high efficiency and good transmission quality can meet the requirements of many video image processing and transmission field application in current, and has a good application prospect. The design of system software and hardware that introduced in this paper is the key.
Research of Servo System for WEDM Based on DSP
Authors: Chen Lan
Published: July 2011

WEDM as a special processing method is widely used in the manufacturing. Focused on the hardware and control strategy of servo control system deficiencies, a new design plan is proposed for WEDM servo control system based on DSP. Author takes TMS320LF2407A DSP chip as core processor for the system, development of the servo feed control system. In the designing, depend on detection circuit output signal which reflect discharge gap state load, the normal spark discharge and short circuit, and be processed by the corresponding module of DSP, the principle is that get the best spark rate.
Development of Energy Saving Control System for Street Lamps Based on SCM
Authors: An Shuang Li , Qian Rui , Lu Xiang Yu , Lu Yuan
Published: July 2011

This paper presents a proposed energy saving system for street lamps based on single-chip microcomputer. In this case, light control timer, smart sensor, wireless transceiver, microcontroller smart regulator and other related techniques are utilized to fullfil a ‘green lighting project’. It can not only automatically turn on or off the master switch according to the local sunrise and sunset, and sooner or later, sunny day, rainy days or the actual brightness of the different lamps, but also control each single lamp intelligently. The system can be widely used in road and tunnel lighting, building lighting, and other fields as well as a variety of energy-saving control dimming voltage based intelligent control areas.
Numerical Simulation of Combusting Flow Field in Ram-Compressed Rotor Chamber
Authors: Wang Yun , Zeng Zhuo Xiong
Published: July 2011

The rotating ramjet is a new conceptive engine based on the ram-compressed technology rely on high-speed rotating rotor, the engine’s core component is an internal combustion rotor, which has the functions of compressing air, combusting and doing work by exhausting. In order to predict the combusting flow field in Ram-compressed Rotor chamber, the model of Ram-compressed Rotor was set up. The fuel composition was defined in software prePDF. Realizable was used for the gas phase turbulence. Fuel particles phase makes use of stochastic tracking model. The Structure characteristics of the combusting flow field and temperature field were found out by numerical simulation. The numerical simulation results show that the combusting flow field in the Ram-compressed Rotor Chamber has simple inlet and outlet is well, and offer the references to the design of combustion chamber especially the contour design of the scramjet nozzle.
Key Technology of Automatic Ultrasonic Testing System for Corkscrewed Steel Pipes
Authors: Kang Yi Hua , Tu Jun , Wu Jian Bo , Sun Yan Hua
Published: July 2011

According to the increasing demand for the steel pipe in the world nowadays, as an effective method, ultrasonic testing plays a very important role in quality controlling procedures. Compared to the mature technology of the world, the domestic one still has some technical difficulties in high-speed probe rotating mode. This paper proposes an approach of combination of multi-probe arrays based on the internal detection way to solve the difficulty of coarse pitch. The structure of the inspection system is described with the workflow laying out. The practicability and reliability of the system is verified by means of a mass of experiments. The numeric automatic ultrasonic testing system has been successfully used and the technical data is given out at last.
The Design of Control System of Rapid Prototyping Machine for Ceramic Parts Based on SIEMENS S7-200
Authors: Gao Dong Qiang , Zhang Fei , Mao Zhi Yun , Li Zhong Yan
Published: July 2011

The traditional control system of rapid protyping machine for ceramic parts has many shortcomings: complex wiring, low control accuracy, incovenience maintenance and lack of flexibility, while the control method based on PLC can improve the comprehensive performance of the overall machine. The paper selectsSIEMENS S7-200 small PLC system to do generalized design for the rapid protyping machine for ceramic: including the wiring conection of hardware and distribution of I/O; programming by V4.0 STEP7-Micro/WIN SP3 software,which is flexible, interface friendly and debugging convienent.