bluuebunny/crossref_metadata_2025 huggingface dataset:
Phase Locked Loop Pulse Signal Frequency Multiplication Circuit Design Based on FPGA
Authors: Zhou Ying Ying , Shen Yu Ming
Published: December 2012

Phase locked loop pulse interpolation technique requires for the input pulse signal frequency multiplication processing. With FPGA as the core, by detecting the edge of the input pulse signal the separate frequency factor was generated, then frequency division of the system clock was realized according to the separate frequency factor, thus phase locked loop frequency multiplication processing of the input pulse signal was completed. The simulation results show that this method has the advantages of high precision and short frequency response time, etc.
Analysis of the Principle and Suppressed Measures of Low Frequency Oscillation in Interconnected Power System
Authors: Wu Qiu Li , Cheng Xi , Tan Jian Cheng
Published: December 2012

In interconnected systems, the low frequency oscillation becomes an important factor that affects the power system stability and limits power transport. This paper analyses the principle of low frequency oscillation in power system and the measures on suppressed low frequency oscillation, at last discusses the future development.
Effect of Structural Parameters on High Frequency Characteristics of Microstrip Meander-Line Slow Wave Circuit
Authors: Chen Chang Ting
Published: December 2012

A novel V-shaped microstrip meander-line slow-wave structure was investigated to expand the operating bandwidth. The high frequency characteristics of V-shaped structure and traditional N-shaped and U-shaped structures were analyzed by electromagnetic simulation software HFSS, and the effects of different structural parameters on the high frequency characteristics were studied. The results show that the V-shaped structure provides better performance in operation bandwidth and interaction impedance than traditional structures, and when the dielectric rod replaces the dielectric slab the performance further improves.
A New Timing Extraction Algorithm and its Application in all Digital Receiver
Authors: Lv Jun , Li Tong , Sun Wei Tao
Published: December 2012

This paper presents a timing extraction algorithm which is based on the near optimum criterion, the near optimum phase appear when the spectrum of sampling signals maximum at f=1/2T.The algorithm has some features, such as fast convergence, the jitter is small, a small amount of computing and so on. This algorithm easily implements on the DSP and has a good application in the all-digital receivers.
Design of Rotate Speed Sensor Based on MR Elements
Authors: Jiang Kun , Yang Ping , Ma Ren Tian
Published: December 2012

In order to meet the needs of speed measurement for rotation system, a rotation sensor which based on the principle of Anisotropic Magnetoresistive Effect was designed in this paper. This paper presents the principle, detailed hardware circuit, frequency characteristics of the sensor, as well as the valid detection distance. The sensor used MR elements as the sensing element. It turned the change of the magnetic gear’s rotation speed into the change of the circuit’s output signal and ultimately achieved contactless rotation measurement of the magnetic gear. The hardware circuit of the sensor includes five parts: signal collection, impedance matching, signal amplification, digitalization processing and signal output. The tests show that its operating frequency ranges from 2 Hz to 6 KHz.
Detection of Sulfamethazine Residues in Milk by Surface Plasmon Resonance-Based Biosensor Inhibition Immunoassay
Authors: Fu Yun Liang , Pan Men Mei , Sun Shu Juan
Published: December 2012

A method for detection of sulfamethazine（SMT）in milk by coupling indirect inhibition assay with a self-assembled monolayer was developed. The method of immobilization of SMT-BSA on the chip surface was also introuduced. A series of milk samples with spiked 0, 5, 10, 20, 30, 40 ng/mL of SMT were analyzed by the SPR biosensor and the standard calibration curve of SMT in milk was constructed. The intra-assay relative standard deviation (RSD) and recovery were 6.3% and 102.8%, respectively. The inter-assay deviation (7 days) was less than 6 IU, and demonstrated the method’s stability. The high stability of the SPR sensor underlies the potential of the SPR method as a stable and high-precision tool for detection of SMT.
Study on an Optimization Method of Deployment for Wireless Sensor Networks in Buildings
Authors: Zhu Ming , Yu Xiao Fen , Hu Jia Wen , Wang Biao
Published: December 2012

Wireless Sensor Networks (WSN) has been increasingly used in various fields of modern production and life, such as industrial control and environmental monitoring. However, there is no effective and universal algorithm at present for optimizing the deployment of WSN nodes in buildings. The main reason is the complex environment of the monitoring region which brings about the difficulty in determining the attenuation of wireless signal. The relationship between the Received Signal Strength Indicator (RSSI) and Packet Error Rate (PER) are discovered by the experimental method, then the corresponding mathematical model is also established by the experimental data. Based on different PER value, one method for optimizing the deployment of nodes in buildings is proposed by the RSSI value of the sensor node. This method can use fewer sensor nodes to cover the required monitoring region, which has the advantage of low-cost network construction, easy maneuverability and good versatility and et al. Finally, the deployment method of sensor nodes and the deployment example of temperature and humidity monitoring system are given in the paper.
A Novel Dynamic Approach of Accelerometer Calibration in GPS/DR Integrated Navigation System
Authors: Wang Yan Ran , Zhang Hai , Zhou Qi Fan
Published: December 2012

In this paper, a novel GPS (Global Positioning System) and DR (Dead Reckoning) system which is based on the accelerometer and gyroscope integrated system is designed and implemented, a new accelerometer calibration algorithm is also proposed. In this system, the odometer used in traditional DR system is replaced by a MEMS tri-axis accelerometer in order to decrease the cost and the volume of the system. The system is integrated by the Kalman filter and a new mathematical model is introduced. In the purpose of reducing the effect of the accumulated error caused by drift and bias of accelerometer, the accelerometer is calibrated online when GPS performs well. In this way, the integrated system does not only could obtain the high-precision positioning in real time, but also performs stably in practice.
Analysis and Comparison of WSN Routing Protocols Oriented to WBAN
Authors: Wang Yi Dan , Liu Yi
Published: December 2012

Wireless Body Area Network (WBAN) can implement the wireless communication between several micro-sensor units, so as to meet demand of medical remote monitoring, disease control, disease prevention and others. In this paper, we will analysis in-depth of some characteristics of three routing protocols commonly used in wireless sensor network, including energy consumption, transmission rate, network stability and unexpected resilience of communication. There are also some statements for both the strengths and weaknesses of each protocol and the improvement advices, finally according to the characteristics of each protocol to analyze the respective applicable WBAN types. By improving the routing protocols, WBAN can provide more practical and beneficial applications in the medical, entertainment and other fields, thereby the popularity of it will be improved.
Effect of Variable Fiber Spacing on Post-Buckling of Boron/Epoxy Fiber Reinforced Laminated Composite Plate
Authors: Al-Mosawi Ali I.
Published: December 2012

The primary objective of research is to determine the improved structural efficiency of plates can be with variable fiber spacing. The Post-buckling of laminated composite plate with variable fiber spacing is obtained numerically, using eight node isoparametric quadrilateral elements (serendipity element) with five degree of freedom per node. The mathematical formulation is based on first-order shear deformation theory and von-Karman non-linearity. The effect of the initial geometric imperfection, fiber spacing, orientation fiber, and direction of in-plane loading were considered. Numerical results for boron/Epoxy fiber reinforced laminates are presented for the different effects of the composite plate under in-plane loading. This study showed that the post buckling behavior of composite plate very sensitive for type of distribution fiber and the seventh distribution equation gives maximum buckling load and smallest deformation.
Study Concerning the Effect of the Bushings' Deformability on the Static Behavior of the Rear Axle Guiding Linkages
Authors: Totu Vlad , Alexandru Cătălin
Published: December 2012

In this paper, we attempt to study the influence of the bushings (compliant joints) on the static behavior of the guiding system used for the rear axle of the vehicles. In fact, we are interested to determine the difference in behavior between the compliant model (with bushings) and the rigid model (bushings modeled as spherical joints) of the axle guiding mechanism. The static model, in which the car body is attached to ground, is a constrained, multi-body spatial mechanical system, in which the bodies are connected through geometric constraints, compliant joints, and force elements. The external loading is made by vertical forces applied to the wheels, in stationary regime. The study is made for the general groups of guiding mechanisms, with M=1 and M=2 degrees of mobility, by using the MBS (Multi-Body Systems) environment ADAMS of MSC Software.
Assessment of Engine Deterioration Based on Oil Fe Data
Authors: Valis David , Zak Libor , Walek Agata
Published: December 2012

Nowadays system requirements are set up and evaluated in various manners. When determining an item technical state, there are many options available. However, in order to specify the state and the condition of a system, we choose one off-line approach. The paper deals with mathematical processing, monitoring and analyzing oil field data. Such data comes from the laser spectrography within tribodiagnostic oil tests. When analyzing oil data, we apply mathematical methods based on the analyses and calculations of time series. It is expected to get the results which will help to improve maintenance policy, life cycle costing and operations. Due to the fact that the data sample has been classified as fuzzy and uncertain, the FIS (Fuzzy Inference System) is used.
Generation of the Storage Costs Function Using Neural Networks
Authors: Campean Emilia , Morar Liviu , Pop Dumitru , Pap Stefan
Published: December 2012

The main purpose of the paper is to develop a neural network application destined to the raw material stock management, as an performant alternative to the classical models of costs stock management. Stocks of goods that manufacturers would classify as raw materials stocks are, in a special sense, goods in early stages of the production process. The testing was made for three companies from the automotive industry, but it could be applied to any kind of Romanian organization.
Productive Performance Analysis in Machinery Industry Using Malmquist Index
Authors: Tanase Ionela , Morar Liviu
Published: December 2012

Finding productive performance of a producer is a topical issue on the basis of which has been and are done a large number of research. Currently there are several productive performance measurement techniques detailed in various forms, among which the most used are the efficiency and the productivity. The work presents the comparative measurement of the efficiency and productivity for a processing activity of specific products from machines constructions, organized in several enterprises in the area of N-V of Romania, between the intervals 2005-2010. This study uses data envelopment analysis (DEA) to measure the utilization capacity in six enterprises. Malmquist index method used in this research indicates that there is the tendency to increase or decrease the productivity and efficiency of the studied enterprises. Identification of positive or negative trend productive performance can be used to prepare a strategy of reducing inefficiencies and improving effectiveness of production process. Specifically, this study quantifies the level of technical efficiency and technical change in this particular manufacturing sector.
Contributions to the Constructive Optimization of an Orientation Module in the Structure of the TRR Industrial Robot
Authors: Petrişor Silviu Mihai , Bârsan Ghiţă
Published: December 2012

The author of the present paper proposes a constructive version, selected on the grounds of dynamic and organological equations, which enables an optimum design and operation of the (MO Sil) orientation module that possesses two degrees of freedom, to which the prehension device is attached, in the mechanical structure of the TRR-type serial modular industrial robot. This paper aims at highlighting the dynamic modelling of the mechanical structure of the TRR-type robot by using Lagrangian formalism, with aspects regarding the MO Sil module’s organological construction as well as with the 3D modelling of the orientation module in the mechanical structure of the robotic arm. Another important issue that this paper deals with is the mathematical-organological algorithm used for the selection of the servomotors actuating the orientation movable system in the mechanical structure of the robot.
Robotics for Neurorehabilitation: Current State and Future Challenges
Authors: Keller Thierry , Veneman Jan
Published: December 2012

Currently in neurorehabilitation robotic devices are mostly applied for rehabilitation of the motor functions of the lower and upper extremities. Even if in recent research autonomous and humanoid robots are being used for cognitive rehabilitation robot medicated therapy predominately supports relearning of motor functions for subjects suffering from stroke, spinal cord injury or other neurological conditions. This review paper provides a summary of the main features and applied methods, and presents some examples to outline the large diversity of currently used devices. Future challenges for rehabilitation robotics to reach full clinical acceptance are clear answers regarding the optimal dosage of movement therapy and right inclusion/exclusion criteria for specific treatments.
Finite Element Modeling of Composites System in Aerospace Application
Authors: Al-Madani Ramadan A. , Jarnaz M. , Alkharmaji K. , Essuri M.
Published: December 2012

The characteristics of composite materials are of high importance to engineering applications; therefore the increasing use as a substitute for conventional materials, especially in the field of aircraft and space industries. It is a known fact that researchers use finite element programs for the design and analysis of composite structures, use of symmetrical conditions especially in complicated structures, in the modeling and analysis phase of the design, to reduce processing time, memory size required, and simplifying complicated calculations, as well as considering the response of composite structures to different loading conditions to be identical to that of metallic structures. Finite element methods are a popular method used to analyze composite laminate structures. The design of laminated composite structures includes phases that do not exist in the design of traditional metallic structures, for instance, the choice of possible material combinations is huge and the mechanical properties of a composite structure, which are anisotropic by nature, are created in the design phase with the choice of the appropriate fiber orientations and stacking sequence. The use of finite element programs (conventional analysis usually applied in the case of orthotropic materials) to analysis composite structures especially those manufactured using angle ply laminate techniques or a combination of cross and angle ply techniques, as well considering the loading response of the composite structure to be identical to that of structures made of traditional materials, has made the use of, and the results obtained by using such analysis techniques and conditions questionable. Hence, the main objective of this paper is to highlight and present the results obtained when analyzing and modeling symmetrical conditions as applied to commercial materials and that applied to composite laminates. A comparison case study is carried out using cross-ply and angle-ply laminates which concluded that, if the composition of laminate structure is pure cross-ply, the FEA is well suited for predicting the mechanical response of composite structure using principle of symmetry condition. On the other hand that is not the case for angle-ply or mixed-ply laminate structure.
An Analitical Approach Regarding the Choose of Integration Time and Gain Values during a Thermal Camera Calibration
Authors: Borcan Octavia , Spulber Catalin
Published: December 2012

The paper presents an analytical method to approach the choice of integration time and gain values when a thermal camera with starring detector is calibrated. Using a simulation interface made in LabVIEW, the authors reveal the dependence between gain and integration time when some parameters as background and target temperatures or atmospheric transmission are changed.
Rapid Prototyping of a Hand Model for Rehabilitation
Authors: Ionescu Mircea , Roșca Ileana Constanţa
Published: December 2012

Studies and researches in medical devices made evident the need of new systems and technologies for locomotors recovery of human body as to reduce the reintegration time in normal activities and, not the least, to improve the recovery quality, to give the possibility to perform natural movements identical to those before the suffered injury. Thus, the purpose of this paper is to obtain the 3D virtual model of a mechanism describing the hand kinematics, and a real medical prototype device to be used in locomotors recovery of the hand. In order to perform the movements, pneumatic fluidic actuators are used, considering that they are flexible, small, made especially for this project. A specialized software for assisted design is used to obtain the virtual model and for the fabrication of device component parts Rapid-Prototyping technology is applied, the Fused Deposition Modeling principle (FDM).
Selection of Proper Cells Using Connected Components Tracking Algorithms
Authors: Penchev Daniel
Published: December 2012

This paper describes an approach of automation selecting the proper male sperm cells to be used for female egg cell injection. Connected components analyze is used for image processing and micro object tracking.
Study on Particle Breakage and Strength Characteristic of Different Coarse-Grain Contents
Authors: Wang Guang Jin , Si Yue Tong , Kong Xiang Yun
Published: December 2012

The significant particle size grading and the particle breakage of deep soils are two major characteristics of super-high dumping-site. Based on the refitted large-scale direct shear experiments, this paper studied the particle breakage and shear strength of different coarse-grained soil. The experimental results indicates a conclusion: particle breakage index is very small when upright stress is less than 400kPa .The breakage rate increases obviously with the increase of upright stress. The particle breakage index is very little when coarse-grained contents are less than 46.0% .It increases significantly when coarse-grained contents are larger than 46.0%. Hyperbolic curves can express the relationship between particle breakage index and upright stress. The experiments studied on shear strength shows that the shear stress-strain curves are micro-softening model or micro-hardening model under low upright stress. The curves are slight-softening model at higher upright stress when the coarse-grained contents are equal to 24.0%. At coarse-grained contents equal 78.0%, the shear stress-strain curves are softening model under low upright stress. The shear strength envelope expressed nonlinear under higher upright stress.
Research of Ceramic Raw Materials Classification Base on Multivariate Chart Method
Authors: Zhou Yong Zheng , Ouyang Ru Dong , Wu Han Jun , Kong De Juan
Published: December 2012

In this paper, it was discussed the Rader chart, trigonometric polynomial graph and the constellation graph which can be programmed and realized by MATLAB SOFEWARE and got it applied in the research of Ceramic Raw Materials classification used the replacing theory of same type kaolin to reduce the cost of raw materials and reduce the cost of transport. To improve the economic benefits of the production of ceramic enterprises, and the research results will be widely applied in industrial production for the purpose of guiding ceramic.
Discussion on the Application of Computer Network in the Ceramic Industry
Authors: Gao Chang Qing , Gao Ying , Gao Hui Fan
Published: December 2012

Along with the development of economy and the improvement of the people’s living standard, the requirements of people on the ceramic products have been proven to be increasingly higher, but simultaneously the pressure on the ceramic industry is greatly increased. On the basis of the development of the ceramic industry, it is necessary to pay attention to the real life, absorb the new thoughts, new ideas, and new techniques of the high technologies of the modern times, follow the road of combining the modern science and technology, and ultimately create a new pattern for the ceramic industry.
Effect of Strain Rate on Mechanical Properties and Microstructures of Fe-23Mn-0.6C TWIP Steel
Authors: Gao Yong Liang , Yuan Shu Qiang , Lv Yan , Chen Wei , Hu Shi Lian
Published: December 2012

Effect of different strain rate on mechanical properties and microstructures of Fe-Mn-C twip steel were studied by dynamic compressed using Gleeble 3500 at room temperature. The results show that Rm and Rp0.2 gradually increase with the strain rate increasing, and the TWIP steel has a strong strain rate effect; The curves of strain hardening rate and true strain have different stage with different strain rate; The mechanism of the deformation behavior was also investigated, it was found that the evolution of microstructure was controlled by dislocation and deformation twins, but the density of dislocation and the appearance of twins were different with increasing strain rate.
Simulation Analysis of Coating at Uniform Velocity of Robotic Spray Gun
Authors: Chen Yan , Chen Ken , Yan Hua , Wang Li Qiang , Zheng Lin Bin
Published: December 2012

Coating uniformity model was developed to optimize spray painting robot trajectories, assuming uniform robot motion and a parabolic spray distribution with uniformity evaluated based on the thickness variation. Dimensionless calculation results show that overlapping distance is a major influencing factor of mean coating thickness, and that seed path position and work piece width are secondary ones. Overlapping distance is a critical influencing factor of coating uniformity, but seed path position and work piece width exert little influence on coating uniformity. Minimum thickness variance is about 0.0025 if overlapping distance is between 0.29 and 0.31. Thus, Overlapping distance should be taken into account to plan robot trajectory for spray painting, but seed path position and work piece width could be neglected.
The Modeling and Simulation of Vehicle Transmission Watt Loss Based on Principal Component Regression
Authors: Gong Lei , Dong Yu Cai , Cao Su Na , Yi Liang Hai
Published: December 2012

According to analyze the Principal Component Regression, and set up a modeling about the watt loss in a certain vehicle transmission, which the modeling result is keeping a line with the real value. Moreover, compared with the comprehensive watt loss modeling which is the popular application currently, and to analyze the two simulation results in the relative error, which can prove the new simulation result is useful and valid.
Design and Implementation of the PPS System Simulation Platform PPS-CICQ-SIM Based on CICQ
Authors: Li Xiu Qin , Yang Xi Liang
Published: December 2012

The simulation has become an important means to evaluate and analysis performance of the design during the study of switch structure and scheduling algorithm. Simulation software for switch structure and scheduling algorithm exist at present all defective in inheritable and scalability. In order to evaluate the performance of PPS system accurately and intuitively, the simulation platform CICQ-PPS-SIM for PPS system was designed. We used Object-oriented technology to analysis, design and implement the platform. CICQ-PPS-SIM overcame the problems of simulation software existing like lack of scalability, poor operational and so on, provides an effective means to evaluate the performance of switch system.
Analysis on Fatigue for Aircraft Riveting Thin-Walled Components
Authors: Chen Wen Liang , Yang Yue , Wei Hong Yu , Jiang Hong Yu , Huang Zhi Xiang , Wang Yu Bo , Yu Lu
Published: December 2012

Fatigue damage of airframe often caused by riveting defects, which resulting in failure of aircraft structure in service. Based on the theory of classical fatigue fracture, the effects of Interference-fit gap on capabilities of safe service are examined and a new method of measuring the dimension of Interference-fit gap under the different conditions is introduced by cutting test and fatigue test of typical aluminum alloy 2024-T3 in aero industries. And the admissible value of Interference-fit gap for riveting is given, which offered the technological basis to achieve long fatigue of the aircraft.
Labview Based Experimental System Design for the Investigation of Magnetorheologic Fluids Inductance
Authors: He Guo Tian , Chen Jie Sheng , Song Li , Ma Yan , Li Ming , Zhang De Sheng , Wang Song , Ran Ying Chun
Published: December 2012

A Magnetorheologic fluid is a kind of intelligent material with high performance, its inductance has an important impact on its manufacturing and application, and thus it is important to investigate its inductance. This paper mainly introduced the method using labview to develop an experimental system to investigate magnetorheologic fluids inductance, and built such a system. It also discussed the composition and function, and designed the experimental procedures. We detected and analysis magnetorheologic fluids inductance under different conditions. This system utilized software to implement realtime sampling of time domain signals, display frequency domain signal and some other signal analysis function. Experimental results indicated that this system is feasible.
Visual Simulation Research of Hovercraft Base on EPX-500 IG
Authors: Yuan Li Hao , Song Lei , Zheng En , Dong Zhi Hui
Published: December 2012

Aiming at the maneuvering training character of hovercraft, a visual simulation system is developed based on EPX-500 IG(Image Generator), and core-technology research is made, include the production of high revolution land database, simulation of sea waves and the detection of HOT(S) (Height of Terrain(Sea)) both on continent and sea surface. Consequentially gains the vivid simulation of hovercraft’s navigation scene, and the capability of real-time adjusting gesture of hovercraft in the motion simulation system module according to the response of the terrain.
Application of CAD Secondary Development Technology in the 3D Parametric Design of Mechanical Parts
Authors: Lu Ming
Published: December 2012

This paper mainly studies the technology of computer aided design in mechanical design application. In the three-dimensional spring parametrization design as an example, introduced the use of AutoCAD embedded Visual LISP development tools for3D parametric graphic design principles, processes and methods, introduction of computer aided design technology, reduces the design personnel repetitive drawing work, improve the efficiency of design.
Development of Vibration Excitation and Control System for High Frequency Application
Authors: Chen Tao , Zhang Da Wei
Published: December 2012

A complete system of vibration excitation with force feedback control for piezoelectric inertial exciter is presented. The vibration exciter is constructed and its dynamic model is established composed by piezoelectric stack, inertial mass and pretension institutions based on principle of inertia and reaction. The control system takes software program as the core part. The workflow of the digital step sine sweep control software for exciting force limit is recounted. Variety techniques are utilized to ensure real time and stability in the control process, including synchronization output and acquisition, extracting single tone information from waveform, model reference adaptive scaling control for amplitude of the output waveform. Some tests on a micro driving platform with high stiffness are carried out to verify the actual performance of the system. The results show that the piezoelectric inertial exciter and control system designed are very suitable for step sine sweep vibration excitation and exciting force control in high frequency range.
Motor Parameters Matching Based on Motor Loss Model and the Actual Drive Cycle of Hybrid Electric Vehicle
Authors: Wen Jing , Chu Liang , Wang Jun Nian , Yin Jian Kun , Wang Yan Bo
Published: December 2012

The paper describes a way of matching the traction motor’s continuous parameters without changing the vehicle’s power performance. First, the traction motor’s peak parameters were matched according to the power performance of the HEV. Second, using the statistical tool, the region of the continuous parameter is set according to traction motor working distribution under actual drive cycle. Third, the continuous parameters were matched according to the motor loss model and the motor test cycle. Finally, vehicle simulation is done in CRUISE, simulation results show HEV traction motor matched using this method can improve the economy performance of the vehicle under certain drive cycle.
Improved Genetic Optimization of Electric Motorcycle Planetary Transmission
Authors: Yu Pei Lin , Yong Wang
Published: December 2012

Determination of dedendum circle diameter of ring gear in planetary gear drives is an important issue in preliminary design of electric motorcycle transmission. Genetic optimization is used to automate preliminary design of gears by minimizing volume of gear trains. An improved genetic optimization method was applied to a planetary gear transmission of electric motorcycle. Gray code way was applied in variable binary strings for improve research efficiency. Dynamic penalty functions were introduced to the objective function for handing the design constraints. The results were compared with a enumeration method usually applied. Improved GA produced quite well results promptly supplying design parameters of a planetary gear transmission.
Optimization Analysis of Exhaust Muffler for a Hybrid Car by GT-Power
Authors: Liu Zhong Da , Guo Yu , Chen Lin , Gao Yan
Published: December 2012

Both the attenuation performance and the aerodynamic performance should be carefully considered in the muffler design of automobiles. Aim to improve the exhaust-muffler properties of a hybrid car, a design work has been done and introduced in the paper. Firstly, the volume analysis method was utilized to give a rough estimation. Then, the GT-Power software was employed to construct the coupled simulation models of the process of acoustic performance and engine running, by which the insertion loss analysis and the exhaust back pressure difference analysis were completed. By combined the simulation with the experiment analysis, the acoustics performance and air dynamic characteristics of each model was obtained, and it provides the theoretical fundament for the improved design.
Structure Analysis of FTIR Infrared Spectrometer Based on ANSYS/Workbench
Authors: Chen Zhao Ming , He Guo Tian , He Ji Ming , Xu Ze Yu , Lin Yuan Chang , He Shi Xuan
Published: December 2012

The CAD software SolidWorks was used to create a three-dimensional finite element model of FTIR infrared spectrometer, and the model was imported into ANSYS/Workbench to modal analysis and harmonic response analysis. Through modal analysis, each order natural frequency and vibration shape were obtained. From modal shape analysis, all components of the stiffness strength and elastic deformation situation were got, and many times tests were carried to enhance stability of the structure and materials which had the most seriously deformation and direct effect impact to the quality of interferometer. The most sensitive frequency range of the system was concluded by harmonic response analysis, which provided a basis for further designing and improving of the spectrometer performance.
Visual Saliency Detection Based on Deredundancy and Global Contrast
Authors: Shen Huan , Miao Xiao Dong , Tan Yun Sheng
Published: December 2012

A new method for saliency detection is presented. Based on the sparse coding model, we propose a power spectral filter to eliminate the second-order residual correlation, which suppress the global repeated items effectively. In addition, aim to modeling the mechanism of the human retina prior response to high-contrast stimuli, the effect of color context is considered. Experimental result indicates that our method has high-quality detection performance with respect to the ability not only to highlight the salient objects in complex environment but also to pop up them uniformly.
Study on Image Detection Method of Navigation Route for Cotton Harvester
Authors: Li Jing Bin , Chen Bing Qi , Liu Yang , Zha Tao
Published: December 2012

This paper presents an image detection algorithm for navigation route of cotton harvester. Two cameras were respectively installed on the leftmost and rightmost picker unit, and images were captured during working process respectively. Firstly, the color characteristics among harvested field, un-harvested field, outside-field and the end of field were analyzed, then the target features of different fields was extracted using the color difference 3B-R-G. Secondly, candidate point group was determined by looking for the critical point of peak from the lowest trough point to un-harvested field and associating with the detection result of the anterior frame. Lastly, navigation line was obtained by using passing a Known Point Hough Transform (PKPHT). Results show that the navigation line detected using this algorithm can fit the boundary line and the edge of field accurately, the average processing time is56.10ms/f, and the algorithm can meet the actual production needs of cotton harvester.
On the Automatic Equipments and Network Controls in Electric Power Communication
Authors: Li Zhi Peng
Published: December 2012

The development of the technologies in the electric power industry has promoted the application of the automatic equipments, and simultaneously has given rise to the great difficulties for the operational control of the operation personnel. Besides, the arrival of the era of information knowledge has driven the popularity and application of the network technology, and also the network control system starts to be applied to the operation of the electric power communication. The application of the computer network to the automatic control on the communication equipments has greatly reduced the difficulties of the communication transmission in the operation of the monitoring devices as well. In accordance with this point, the author lays a stress on the analysis on the automation equipments and network controls in electric power communication in this paper.
Quantity Detection of Kernels in an Ear Corn Based on Machine Vision
Authors: Liu Chang Qing , Chen Bing Qi , Liu Yang , Zha Tao
Published: December 2012

A high efficient method is provided to count the number of kernels in an ear corn. PC camera captured a sequence of images around an ear corn using a simple device. The Otsu's algorithm was applied for background segmentation. An object processing area was obtained after contour extraction. The x-direction cumulative histogram was used to extract every row of the ear corn. The y-direction cumulative histogram was used to detect the number of corn kernels in a row. The number of rows was got by matching the edge of the current ear row with the first one. The time of detecting kernels for an ear corn was below 2 minutes and the average accuracy was about 95% in experiment. It shows that this method can detect the quantity of kernels directly in an ear corn quickly and effectively using a low-cost device.
Grid Generation and Airwake Simulation on Ship
Authors: Liu Chang Meng , Gao Ye
Published: December 2012

Dynamic characteristics of flow field on the ship deck are complex. CFD(Computational Fluid Dynamics) results of LHA ship were verified the accuracy of numerical simulation through compared with the experimental data. Three different grids were generated to discuss and analyze the influence of the prismatic layer grid. The results show that, the presence of prismatic layer grid does not affect the results. With calculating the full-size aircraft carrier ship, the mechanical evolution of vortices in the ship deck airwake field was found. The results can provide an important reference for engineering calculation of the fluid dynamics and establish best design method early in a ship's planning stage.
Based on the PRO-E Embedded a Type Plastic Mould Modeling Analysis
Authors: Liu Yu Mei
Published: December 2012

Based on a type of plastic mold design embedded, the analysis of the components, mainly discusses the internal model set piece qualifying, Pro/e model modelling, establish mould parts, determine the parting surface. Analysis of the thin-wall shell parts of patterns size force, and points out that the cores of patterns resistance from six main place, make a design of the mould can reach this plastic parts required processing technology.
Slope Displacement Prediction Model Based on LMD and BP Neural Network
Authors: Yu Wei , Cai Jing Lu , An Feng Ping
Published: December 2012

Slope displacement time series prediction model,a combination of Local mean decomposition(LMD) and BP neural network is presented.By selecting train samples on the basis of monitoring data on slope displacement and conducting an adaptive decomposing, several production function is obtained.After that, BP neural network is used to forecast the PF and finally adding it all up and the result is the predicton of slope displacement. BP neural network is used to optimize the parameters so as to improve the forecast accuracy.The model is put into application on the slope displacement forecasting of the permanent lock slope.The case study shows that the prediction result is of high accuracy, scientifically valid and has potential value in the field of slope displacement time series prediction.
A Scheme on Fault-Tolerant Broadcasting for Directed Communication Network with Time Bounds
Authors: Zhu Xiao Feng , Yang Li Jun , Zhou Fei Yan
Published: December 2012

How to transmit quickly and accurately the messages to all nodes, this is the basic problem which urgently needs be resolved in the network. In this paper, the problem on fault-tolerant broadcasting for the directed communication network is studied. First the directed communication network is mapped to the digraph based on graph theory. Then a scheme on fault-tolerant broadcasting is obtained for directed communication network, and its time bounds are given.
Research and Realization of Virtual Assembly Environment of Armored Vehicle Transmission Based on Dual-Channel Projection
Authors: Liu Fei , Yan Qing Dong , Yao Shou Wen
Published: December 2012

The characteristics of assembly of vehicle transmission have been analyzed in this paper. General structure of PC-cluster virtual assembly environment of vehicle transmission based on dual-channel projection was described in detail. According to the characteristics of virtual assembly, analysis on technology of spectra stereoscopic display was performed. A geometric correction method of mechanic correction combined with software correction was proposed on the basis of arrangement form of curtain wall and the type of projector. Dual-channel synchronization mechanism in combination with the principle of PC-cluster was put forward. The application of a practical example in the virtual environment was realized for verifying the aforesaid methods and technologies.
Design of Visual Light and Middle Infrared Zoom Optical System
Authors: Du Yu Jun , Gao Ming , Xin Wei Juan , He Ying Hong
Published: December 2012

In order to achieve wide range for target search and monitor in all-weather, a zoom optical system with long focus length is designed which is used for visual light and middle infrared observation in this paper. In this system, the visible and infrared optical paths share a fixed R-C mirror in the foreside, on whose image surface the parallel plates is used to separate the light beam. Then the dual wavelength band zoom is achieved by two optical transmitted systems whose aperture is 100mm, Zoom range is 300mm~900mm for visual light and 250mm~750mm for middle infrared.This system has stable image and good imaging quality, satisfies the requirements of the application.
The Study on Building Energy Conservation Technology Based on Four-Layer Neural Network
Authors: Li Wan Zhen
Published: December 2012

This paper build general regression neural network building conservation technology project appraisal model, Written software programs with MATLAB7.0 neural network toolbox to appraise building conservation technology project, trained and tested network by 17 ventilation samples, shows that GRNN have a good feasibility for appraisal. The main advantage of the GRNN model reflects four aspects. First of all, GRNN is a very simple and fast learning procedure thus it has less training time. Second, it is unnecessary to define the number of hidden layers or the number of neurons per layer in advance. Third, GRNN can handle linear and nonlinear data. Fourth, adding new samples to the training set does not require re-calibrating the model. Finally, it has only one adjustable parameter thereby making overtraining less likely. Because of these advantages, GRNN can be applied to many fields with other forecasting approaches or appraisal. GRNN building conservation technology project model building and training, testing can use neural network toolbox of MATLAB software.
The Effects of Different Support Forms on the Aerodynamic Characteristics of the High-Speed Train Model
Authors: Li Bao Yu , Shan Xi Zhuang , Yang Zhi Gang
Published: December 2012

By the method of computational fluid dynamics (CFD), this paper calculates the aerodynamic parameters of one complex high-speed train model which adopts different support forms when the reference velocity is 70m/s under different operating conditions. It also analyses the support interference mechanism from the point of flow field structure. The results show that the distributed cylinder support form causes least interference on the model, while the single big cylinder support forms change the flow field structures much which leads to much change of the aerodynamic parameters of the model. The distributed cylinder support form can be applied as a good support form for the high-speed train wind tunnel tests.
Program Evaluation Model of Bridge Blasting of Engineer Corps Based on Intuitionist Fuzzy Sets and TOPSIS Method
Authors: Tian Cheng Xiang , Fu Cheng Qun , Zhou Lei , Guo Jie
Published: December 2012

The implementation of bridge blasting process for ground burst unit of Corps Engineers is complex with lots of impact factors, and it is difficult to determine the blasting program. In order to better solve the problem, the author in this paper proposes a new assessing approach of bridge blasting program based on combination of intuitionist fuzzy set theory and TPOSIS, and defines the optimal solution as well as worst solution of intuitionist fuzzy concept, building the evaluation index system of bridge blasting program majors in blasting target, the implementation staff for blasting, blasting tools and equipments. In this way, the author establishes the model of corps engineers of bridge blasting program based on intuitionist fuzzy sets and TOPSIS method, and verifies the model through the use of instances to prove the feasibility and effectiveness of the model with this method.
The Impact of Irreducible Water on Stress-Sensitivity of Gas Reservoir Rocks
Authors: Xu Hao , Li Zhi Ping , Hu Hua Jun
Published: December 2012

According to many researches, the presence of stress-sensitivity has been confirmed in reservoir rocks. Because it will create huge damage to the permeability of reservoirs, sufficient attention should be made. In this paper, through the experiment, the permeability value change with effective pressure in the condition of saturated with irreducible water and dry environment were compared. The study showed that the stress-sensitivity of core sample was more obvious in the condition of saturated with irreducible water.
Research on the Dynamic Characteristics of a Sphere Material
Authors: Wang Yong Cheng
Published: December 2012

In this paper, we make a research on the dynamic characteristics of a sphere material, mainly using golf as an example. Golf is composed of such as poly butadiene rubber or other synthetic rubber, ion resin, etc. and different viscoelastic materials. The viscoelastic characteristics of this material are selected as spectrometer for evaluation. However, the impact performance of the golf course materials cannot pass such a test to assess, because golf have great impact on the deformation and high strain rate viscoelastic spectrometer. On the other hand, the impact properties of the metal can be used to assess the split Hopkinson pressure bar. However, the rod is not suitable to be used to evaluate the strain wave interference and noise propagation in the impact properties of the polymer materials. Therefore, the split Hopkinson pressure bar has been modified to make it more applicable to the valuation of the polymer materials. The article is based on the concept of modified split Hopkinson pressure bar to make the golf impact evaluation of the performance materials.
Accurate Calculation of the Differential Cross Section of Compton Scattering in Quantum Electronic Dynamics
Authors: Tang Hai Yan , Zhang Jia Wei , Chen Xue Wen , Wang Xian You
Published: December 2012

In the minimum electromagnetism coupling model of interaction between photon and electron, we present a effective and precise calculation on the differential cross section of Compton scattering with the help of the electron renormalized chain propagator. By comparing the result of the differential cross section of the Compton scattering with electron propagator at the tree level and the one loop level, respectively, we find that the correction of the chain diagram is better than the one-loop diagram to the differential cross section in the 10-3order.
Analysis on the Flutter Stability of Span Overpass
Authors: Yang Yan , Li Hu Yong
Published: December 2012

The span overpass anti-flutter stability has been the focus of our study. Large span overpass in the running state of the wind and the load in line with the stability has been the concern and attention of the engineering and technical personnel. This paper establishes a flexible dynamics model through the use of long-span overpass line finite element analysis. Moreover, after the flutter stability of qualitative terms, we have a number of effective methods and measures to increase the flutter stability of the large-span overpass.
Progress in the Application of Refractory Dyeing Wastewater Treatment Processes
Authors: Yang Jie
Published: December 2012

The state and progress in the treatment technology of dyeing wastewater are summarized in this paper, especially the new treatment technologies coming about in the latest years. The developing trend of treatment for organic matters is discussed as well. In the meantime, regional and water-quality water shortages have also been proven to be the bottlenecks for imposing restrictions on the development of the society and economy after land and energy.