bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimum Design of the Jaw Clamping Mechanism of Forging Manipulators Based on Force Transmissibility
Authors: Ding Wen Hua , Deng Hua , Zhang Yi , Ren Yao Qing
Published: February 2012

In this paper, the jaw clamping mechanism of a forging manipulator is regarded as a slider-crank mechanism. First, the force Jacobian matrix of the mechanism is obtained according to the dual relationship of velocity Jacobian matrix and force Jacobian matrix. Then, the performance atlases of the global force transmission index and the input space index that represents the motion range of the jaw are drawn with different inputs for the mechanisms of the nondimensional parameters. Furthermore, we research the effect of these structure parameters of the mechanism on the gripping force transmission and input space, and find an optimal range in the force transmission atlas. Finally, we synthesize a detail optimal flowchart of the jaw clamping mechanism of forging manipulators based on force transmissibility. A jaw clamping mechanism of a forging manipulator is studied as an example, and results show that the method presented in this paper is effective for finding an optimal gripper mechanism. The research in this paper can be served as fundamentals of design and optimization of the jaw clamping mechanism of forging manipulators.
Analysis and Simulation of Fibre-Channel Tandem Network in Avionics System
Authors: Zhu Xiao Lu , Zhang Feng Ming , Wang Yong , Han Xue Yan
Published: February 2012

The analysis, modeling and simulation of the avionics system is the flexible and effective method to evaluate and study avionics system with IMA architecture. With Queueing Theory, we summarize the stability condition, analyze and approximate the end-to-end delay in FC tandem network. In the OPNET, we simulate FC tandem network by building periphery node model, switch node model and the queue process model. Simulation result shows that, under the stability condition, the number of periphery nodes, or the rate of sending data packets has almost linear relationship to end-to-end delay, as the number of switches does nonlinear one.
Research on the Determination of Total Hardness in Drinking Water by Microscale Chemistry Experiment
Authors: Zhuo Yu Guo , Liu Jun , Gao Jia Min , Liu Yu , Kang Zhen Zhen
Published: February 2012

Total hardness is an important index to evaluate drinking water quality. Total hardness in drinking water was determined by micro titration and conventional titration seperately and parallel determination results of microscale chemical laboratory and constants experiment were compared. The results of micro titration were accurate and reliable. Microscale laboratory has such characteristics as obvious phenomena, saving reagents, fast analysis. So the cost was reduced and the innovative ability of students was improved by full compliance with the concept of green chemistry. Microscale laboratory is worth promoting.
Static and Transient Stress Analysis of an Elastic Oil Sump
Authors: Wang Shuai , Liu Zong De , Li Bin , Duan Peng
Published: February 2012

As an important supporting component of thrust bearing of hydropower plant, the elastic oil sump plays a vital role in the safe operation of the hydropower plant. Considering the complicated working conditions of the elastic oil sump, it is of great significance and convenience to use a method of CAE to simulate the actual working state of it. In literature, many researchers have investigated static behaviors of the elastic oil sump. However, a dynamic analysis of the oil sump has been seldom investigated formally yet. Therefore, in this study we particularly focused on investigating the dynamic behaviors of a single corrugated elastic oil sump. In this study, the finite element model of the studied oil sump is built with reasonable simplifications of the working status. Then, static and dynamic analyses of a single corrugated elastic oil sump are performed by the means of ANSYS software. Performance parameters of the sump, the initial oil pressure and dangerous region are determined through the static analysis. In the dynamic analysis, the time-history curves of VM equivalent stress and 1st /2nd/3rd principal stress of a tracked node in the crucial region are obtained. The results showed that the method of finite element analysis (FEA) suits well in the study of the stiffness properties of the elastic oil sump and the stress cycle is big enough to induce fatigue damage to which should be paid close attention.
Discontinuous Yield and Large Deformation Analysis on Rotating Disk Based on J2 Deformation Theory
Authors: Hu Shao Wei
Published: February 2012

Rotating discs are used widely as important structural elements in mechanical engineering. In order to obtain an optimal structural design, it is necessary to estimate the angular velocity and the stress distribution of a rotating disc in fully plastic state. So J2 deformation Theory is used for large deformation analysis of axisymmetric rotating disk. The bursting speed of rotating disk, the stress distribution at instability and analysis on the elastic-plastic interface of rotating disk are studies in detail.
Research of Creating Method for Laser Inner Carving 3D Model Surface Texture Point Cloud
Authors: Cheng Lei , Liu Hai Yan
Published: February 2012

Introduces a kind of method that creating the point cloud for laser inner carving from texture of 3D model surface. At first, the 3D model surface with texture needs to be converted to the triangle faces. Then texture coordinates which corresponded to the vertex will be obtained by visiting the triangle faces. The transform from texture triangle surface to 3D model triangle surface will be completed next. Then the Bayer dithering algorithm should be applied to handle the texture image. At last, the inner carving point cloud will be gained by transforming from the surface texture space to the 3D model space.
Attitude Maneuver Control of Flexible Spacecraft with Finite-Time Convergence
Authors: Wu Shu Nan , Sun Zhao Wei , Wu Xian De
Published: February 2012

The attitude maneuver control of flexible spacecraft with finite-time convergence is investigated in this paper. Two terminal sliding mode controllers are proposed to achieve the finite-time control, which guarantee the convergence of attitude maneuver errors in finite time. The singularity problem associated with the terminal sliding mode control is solved by employing a new sliding variable. Numerical simulations are finally provided to illustrate the performance of the proposed controllers.
Numerical Analysis of Grouting and Blocking of Deep Large Section Shaft at Working Face
Authors: Zhu Ji Ming , Zhang Wen Quan , Yu Hai Ling , Liu Xiang Lan
Published: February 2012

To estimate the effect of deep large section Shaft Face Grouting for water block, the mathematical model is obtained according to the seepage theory. The numerical model for calculation is established by the program ABAQUS. The laws of change of pore water pressure, the effect area of dewatering, the velocity of seepage, water inflow of shaft working face before and after grouting is obtained by numerical simulation. It is shown that the grouting can effectively plug water channel of cracked surrounding rock, and prevent the pore water pressure lowering range to be larger. The working face seepage flow velocity was significantly reduced. The water inflow is decreased significantly. The safety of the shaft construction and the stability structure of shaft lining and upper strata are ensured by grouting. The numbers of grout stop and grouting construction can be largely reduced. The economic benefit is obvious. The scientific reference is provided for deep large section Shaft Face Grouting for water block.
Optimum Setting of DC Drives PID Controller via Particle Swarm Optimization
Authors: Chang Guang Hui , Wu Jie Chang , Zhang Chao Jie
Published: February 2012

In this paper, an intelligent controller of PM DC Motor drive is designed using particle swarm optimization (PSO) method for tuning the optimal proportional-integral-derivative (PID) controller parameters. The proposed approach has superior feature, including easy implementation, stable convergence characteristics and very good computational performances efficiency.To show the validity of the PID-PSO controller, a DC motor position control case is considered and some simulation results are shown. The DC Motor Scheduling PID-PSO controller is modeled in MATLAB environment.. It can be easily seen from the simulation results that the proposed method will have better performance than those presented in other studies.
The Design of the Emergency Retrieval System Based on User Preference
Authors: Huang Wei Dong , Li Min Qian , Yang Ji Dong
Published: February 2012

From the perspective of knowledge retrieval and knowledge push, this paper introduces user preference based on the traditional search engines to meet the personalization demand of the domain knowledge of emergency. A retrieval system aiming at the emergency knowledge is designed by constructing the preference-based function module, setting the frame structure of user preference and improving the core operation process of the system.
Steady Heat Transfer Analysis of Leaf Spring Rotary Engine
Authors: Wang Dong Jie , Zuo Zheng Xing
Published: February 2012

This paper presents the heat transfer simulation of a new kind of rotary engine called Leaf Spring Rotary Engine. The structure and the principle of the prototype engine were introduced. The thermodynamic models including heat transfer model were presented. The contrast of the performance parameters between the heat transfer condition and the ideal condition was presented and the effect of the heat transfer to the performance of the engine was analyzed. It showed that the heat transfer loss would account for 24% of the input energy at the rated speed of 3000r/min. At the same time, the effect of ignition position to the performance of the engine was analyzed. The work would be used in the combustion system design and the performance optimization.
Analysis of the Ferroresonance of 110 kV Power Systems
Authors: Shang Li Qun , Hong Ya
Published: February 2012

Ferroresonance is a usual internal overvoltage in power system; it mostly occurs in distribution network that neutral hasn’t grounded directly, but it also happens in the high voltage grid that neutral-grounded system frequently. This paper introduced the fundamental theory of ferroresonance. An 110kV substation has been used as the model, to emulate the waveform of its ferroresonance, and also discussed the measure to remove the ferroresonance.
Researching on Valve System of Hydraulic Electromagnetic Energy-Regenerative Shock Absorber
Authors: Fang Zhi Gang , Guo Xue Xun , Xu Lin , Zhang Jie
Published: February 2012

Hydraulic electromagnetic energy-regenerative shock absorber is a new kind of shock absorbers, who can perform the function of a standard shock while acting as an additional source of power. One of the core components of this new shock absorber is the valve system. And its function is to rectify the direction of the oil flow. Then the oil can flow through the hydraulic motor from one port only no matter in expansion stroke or compression stroke. The research focused on the compactness, sensitivity and energy recovery rate of two different valve systems. And the results showed that the valve system composed of check valves better matched the hydraulic electromagnetic energy-regenerative shock absorber.
Vibration Analysis and Control for Reciprocating Compressor Piping System
Authors: Li Yong Dong , Han Sheng Liang , Liu Jie , Liu Ji Yong , Du He
Published: February 2012

Following the adequate model of the reciprocating compressor piping system and the compressor design parameters, operating conditions and gas parameters, the mechanical system of compressor piping, gas-column system, pressure pulsations and of vibration response are numerically simulated. And the main factor bringing to the compressor piping system vibration is identified. A reasonable way to controlling piping vibration is developed to achieve a better efficiency. Keywords: Compressor; Pipe vibration; Vibration Analysis; numerical simulation.
Dynamics Simulation of Banana-Type Line Vibrating Screen and Analysis of Applied Force of Fastenings
Authors: An Xiao Wei , Wang Fu Gang , Ji Yu Jie
Published: February 2012

The paper adopts multi-boy dynamics software and simulates and analyzes the banana type vibrating screen. The paper obtains the result of vibration amplitude of vibrating screen at its working through computing；we can get the resonance by analyzing the amplitude curve , which is a significant guidance for design, improvement and maintenance.
Wear and Tribotermal Effects of Nanostructured Nickel Chemical Coatings
Authors: Kandeva Mara , Karastoyanov Dimitar , Andonova Anna
Published: February 2012

The abrasive wear and the wear resistance of composite nickel + SiC coatings are investigated. The coatings are deposited by the method for electroless nickel plating EFTTOM-NICKEL developed in TU-Sofia. Nanosized particles of SiC are used as a strengthened material. The size of the particles is 35-40 [nm]. The thickness of the coatings is 50 [µm]. The investigation of the coatings deposited on the different roughness surfaces is performed. Some of the samples are thermal processed at 300°C, 6 hours after deposition process. The methods for wear resistance testing is developed and the experimental results for the dependence of the massive wear, wear speed, intensity of wear and wear resistance on the friction road and the time of a contact interaction are obtained.
Study on the Crystallization Kinetics of Polymer Thin Films
Authors: Ren Yi Jin
Published: February 2012

The crystallization kinetics of polymer thin film has a great difference from that in the bulk. Generally, the growth rate of the crystal confined in thin film reduces with decreasing film thickness, which is believed that the interaction between chains and substrate is responsible for the decrease of the growth rate. In addition, the ratio of film thickness over crystal thickness is also a key parameter in determining the growth rate. The relationship between the crystal lateral size and the crystallization time also dominates the crystal growth mechanism in polymer thin film.
Design of Rigid Vertical Shaft Guide Testing System Based on MATLAB
Authors: Zhou Fei Peng , Xiao Xing Ming , Jiang Yu Qiang , Zheng Chang Xiang
Published: February 2012

Shaft guide is detected mainly by a static test method ,but it need much time to detect and practical experience of the technical person for most of the mine. This paper designs a testing system based on matlab to solve this problem and introduces the system’s survey principle. The dynamic parameters of shaft is measured by tilt sensors, acceleration transducer and displacement sensor separately, the relations between the shaft rigid’s parameters and breakdown is analysed. The selection and design of hardware system is rational as well as software’s function, the system has strong practicability.
A Shape-Based Two-Stage Product Image Retrieval Method
Authors: Gong Shang Fu , Du Juan
Published: February 2012

Product image retrieval using content of the image is valuable for E-commerce application. But both search efficiency and accuracy are challenging the implementation of content-based image retrieval in large product image database. We present a two-stage product image retrieval method, with fully consideration of individual features of product images. In the initial pruning stage, shape feature based on salient edges of product object is used to generate a moderate number of candidates; in the second stage, the proposed detail feature combined with color and texture features is used for fully retrieval. Experiments show that this two-stage retrieval method accelerates search process with a high accuracy.
Preparation of Bamboo Charcoal/Polyvinyl Formal Foam as Biological Support Material
Authors: Li Guo De , Li Na , Wu Shi Wei
Published: February 2012

Biological material was prepared by adhering different amount of bamboo charcoal filler into the matrix of polyvinyl formal foam by manual controlled foaming process. The material bears properties of low density, high strength, and good adsorption ability from the advantage of polyvinyl formal. It can be used as new efficient biological supporting material in sewage disposal system. The effects of hydrochloric acid, formaldehyde, bamboo charcoal, and temperature on the preparation were investigated.
GPS Data Processing Models for Maritime Dynamic Precision Evaluation of Shipboard Tracking Equipments
Authors: Li Xiao Yong , Zhang Zhong Hua , Zhu Wei Kang , Qu Yuan Xin , Chen Gui Ming , Yang Lei
Published: February 2012

To get a better understanding of tracking capability and accuracy of the equipments onboard space tracking ships, it is necessary to perform precision evaluation. In order to achieve satisfactory results, dynamic flight experiment is organized, during which a series of new methods and technologies are applied, with GPS carrier wave phase difference technology as the center, among which GPS data processing technology is empathized. Based on above, a set of complete GPS data processing models for precision evaluation are established
Analysis of the Solenoid Driving Technique for DCT
Authors: Kong Hui Fang , Qiu Yu Ning
Published: February 2012

The control principle of DCT hydraulic system and the working principle of solenoid were described. The solenoid driving circuits based on TLE6220GP and TLE7242-2G of Infineon were designed. The principle of TLE7242-2G control the proportional solenoid and the calculation formula of Kp, Ki were analyzed. The current control waveforms of proportional solenoid in different Kp, Ki were given according to MATLAB simulation.
Design of Fault Diagnosis Expert System for Certain Type of Aircraft Electrical Power
Authors: Cao Jun Bin , Guo Er Min , Li Yan
Published: February 2012

In order to diagnose and exempt the fault of aircraft electrical system accurately and fast, on the basis of analyzing the lost mode and fault mechanism of certain aircraft electrical system, fault structure are built and structure are built and fault models are analyzed by adopting the analytical technology based on regular fault structure. Two induction mechanisms, namely directional and anti-directional inference are introduced and the component methods are studied based on the knowledge corpus of data corpus technique. The result shows the inference results of fault diagnosis system are in accordance to reality and improve the intelligentized level of fault diagnosis system for aircraft electrical power.
Research of Bridge Crack Detecting System Based on Machine Vision
Authors: Yang Peng Fei , Wang Chang
Published: February 2012

Aiming at the difficulty in crack detecting for bridges, a wireless crack detecting system based on machine vision and RC model helicopter was designed and realized. This system used a wireless camera to capture the surface images of bridges from the direction of below, then images were transmitted to the host computer by 2.4 GHz wireless communication. Edge image of crack can be gained after the image processing program carried out smoothing filtering, adaptive binary and edge extraction for original images of bridge. Image processing program adopted Hough transform to extract the characteristic parameters of bridge crack in edge images including length, width, shape and location of crack. The result of accuracy verification test shows that the relative error of this system was in the range of ±5% and it satisfied the requirements of early crack detecting for bridges.
Vibration Simulation of Roll Grinder Measuring Device Based on ADAMS/Vibration
Authors: Liu Jing , Li Hao Lin
Published: February 2012

Research on the vibration performance of the grinder measuring device and its anti-vibration ability is very important to improve the measuring and grinding accuracy of the roll grinder. According to the problems of real vibration test difficulty and too many unknown parameters for theoretical analysis, a method of integrating theoretical analysis and simulation test is put forward. A vibration analysis virtual prototype of the measuring device is built using ADAMS/Vibration, and then the system natural frequencies, mode shapes and frequency response are solved to conduct free vibration analysis, providing the base for the design and optimization of the measuring device.
Rheological Properties and Spherulite Morphology of Poly(trimethylene terephthalate)/Rubber Blends
Authors: Wang Kun Yan , Xu Xu Qin , Ye Ying , Cao Feng
Published: February 2012

Poly(trimethylene terephthalate) (PTT), and three different rubbers(maleated styrene-butylene-co-ethylene-styrene copolymer (SEBS-g-MA), ethylene-propylene-diene copolymer grafted with maleic anhydride (EPDM-g-MA) and maleic anhydride grafted poly (ethylene-octene) (POE-g-MA)) were mixed in the melt state. Their rheological properties and spherulite morphology were investigated. Rheological properties shows torque decreases with the time increasing for all blends. PTT/SEBS-g-MA blend have better processability than PTT/EPDM-g-MA and PTT/ POE-g-MA blend. Polarizing optical microscopy (POM) experiments showed that the introduction of rubber chain greatly affects the size of the PTT spherulites. Small-sized PTT spherulites were formed when rubber added to PTT.
Personalized Mobile Sensing System Development for Emerging Electric-Drive Vehicles
Authors: Wu Jie , Sun Yi He
Published: February 2012

Emerging green-energy cyber-physical systems (CPS), in particular electric-drive vehicles (PHEV, HEV, and EV), have demonstrated great potentials to significantly reduce greenhouse gas emissions and the ever-growing dependence on foreign oil. Few studies have focused on the user-specific driving behavior and its significant impact on electric-drive vehicles fuel efficiency, battery system life-cycle and the environment. This paper presents a personalized mobile sensing system development for the emerging green-energy CPS, which captures user’s run-time driving behavior and characterizes its impact on (P)HEV operations. The proposed sensing computing system has been deployed in a number of PHEVs and HEVs, with user studies of four different drivers and over 150 driving trips under various road and traffic conditions. Using the extracted real-world hybrid vehicle and user driving data, we have conducted detailed analytical studies of users’ specific driving patterns and their impacts on hybrid vehicle electric energy and fuel efficiency.
Design of Semi-Physical Simulation System of UAV Based on Computer Control
Authors: Yan Hao , Meng Fei
Published: February 2012

For a fly control system of UAV, the author designs the hardware in the loop simulation system, formulates the construction and working theory of it, and introduces the formulation software. The results shows that, the system can supply the good simulation circumstance for this automatic pilot, save the cost and the time. Especially, it is of significance to evaluate the fly quality and accelerate the research progress of UAV.
Research on ANN Dynamic Inversion Control of UAV
Authors: Chen Wei Lun , Xin Gong Cai
Published: February 2012

The paper proposes a method to design AANN dynamic inversion controller through online ANN compensating inversion error. It mainly aims at evident shortage of dynamic inversion controller of UAV. A single hidden layer ANN structure is constructed and the stability of the whole closed loop system is proved. Also the stable adjustment arithmetic of online ANN weight is proposed. The robustness, the adaptability to fault and the response capability to actuator delay time of the scheme are verified by simulation. It is also proved that the online ANN has improved the performance of dynamic inversion controller well. It has important reference value for designing advanced flight control systems of UAV.
Design of Electrical Accessory Integrated Test System
Authors: Yang Jien , Xu Hang , Zhou Ming Qiu
Published: February 2012

To meet the needs of certain series of airborne electrical accessory test, a set of airborne electrical accessory integrated test system is built. The core of the test system is IPC, the hardware and software adopt modular structure. Based on computer control, database processing, self-identification and security technology, the integration and intelligent on airborne electrical accessory test are realized in system. The application results show that this system can not only improve the efficiency of maintenance support, but also has the further ability of extendibility.
Circulatory System of Cold Side of Modeling and Simulation Based on CFdesign
Authors: Li Zhuo , Chen Dan Hua
Published: February 2012

Technology of computer simulation makes the use of the computer software to simulate of the actual system to obtain data on target behaviors, and fluid simulation software CFdesign is one of computer simulation software. Firstly, this paper gives the reason why it adopts fluid simulation software CFdesign to simulate circulatory system of cold side based on parameters of the simplest thermoelectric conversion system and the comparison of simulation software .Then it introduces circulatory system of cold side on thermoelectric conversion test platform, which utilizes waste heat of automobile exhaust. In order to have a suitable circulatory system of clod side, to build the model of circulatory system of cold side by CATIA, it adopts fluid simulation software CFdesign to access to simulation of temperature field
Simple Preparation of Poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) Modified Electrode for Application in Sensing and Biosensing Devices
Authors: Wen Yang Ping , Yao Yuan Yuan , Zhang Long , Xu Jing Kun , He Hao Hua
Published: February 2012

Poly(3,4-ethylenedioxy-thiophene):polystyrenesulfonic acid (PEDOT:PSS), a commercially available aqueous conducting polymer, as the electrode modified material for the development of sensing and biosensing devices has not been widely reported due to its swelling and disintegration in aqueous solution. For this purpose, A poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) modified electrode was facilely fabricated for the electrochemical detection of catechol. 1-butyl-3-methylimidazolium hexafluorophosphate, one of hydrophobic ionic liquids, was used for secondary dopant and enhancer to improve the water-resistance and the electrochemical properties of PEDOT:PSS polymer film. The as-prepared PEDOT:PSS modified electrode exhibited the pronounced water-stability and good sensing performance, which make PEDOT:PSS as an interesting candidate of the electrode modified material for application in sensing and biosensing devices in the near future.
The Nitrogen Quantitative Model Based on Hyperspectral Image of Tomato Leaf
Authors: Sun Jun , Wang Yan , Wu Xiao Hong , Zhang Xiao Dong
Published: February 2012

Based on hyperspectral image which integrates spectrum and image information, the tomato leaf nitrogen model is built. Tomato samples were soillessly cultured with different nitrogen content. The hyperspectral images of tomato leaves are gathered at different stages of tomato. Kjeldahl method determines nitrogen content of the corresponding tomato leaves. According to the hyperspectral information of leaf, the characteristic wave bands of tomato nitrogen are obtained in the method of stepwise regression. The images in the characteristic bands are processed and analyzed, and image features which have high correlation with nitrogen contents of tomato leaves are picked up. The PLS algorithm is used in three growth periods to build tomato nitrogen prediction model, The result of the predicted test shows that the forecast average relative error of PLS model may achieve 10%, and can satisfy the forecast request.
Study on Resistance Characteristics of Marine Moisture Filter
Authors: Sun Tao , Zhang Guo Hui , Zhang Yi , Wang Zhong Yi
Published: February 2012

Based on the periodic features of structure and flow field, two periodic boundaries are used to study the combined filter. The three stages filters are taken as integration for numerical simulation to acquire the resistance characteristics, which provide a reasonable foundation for performance analysis and optimized design of the filter. The resistance characteristics under different operating conditions acquired by experiment are compared with numerical simulation results of two periodic boundaries. The comparison validates the high precision of the ensemble simulation method.
Power Optimizing of Solar Photovoltaic Systems
Authors: Qiao Dao E , Xu Xiao Li
Published: February 2012

Efficient energy yield is a major concern in solar photovoltaic (PV) systems. This paper describes a distributed control system to optimize the power output of the PV systems. The PV systems contain many PV modules. And every PV module has a monitoring and control network node. The communication data are successfully transmitted using a low-cost ZigBee wireless network. The field conditions are monitored by voltage, current, irradiance, and temperature sensors. The power operating point tracking is implemented at the PV module level. The reference voltage is calculated based on a neural network model, which is used to identify maximum power point. And the output voltage is regulated by a digital controller in the integrated converter according to the reference voltage. Experiments show that the power output can be greatly increased with this distributed control system under many shadow conditions.
Calculation Components Analysis of the Lattice Sieve
Authors: Yang Yang , Zeng Guang , Wang Zheng , Han Wen Bao
Published: February 2012

Currently, the best known algorithm for factoring RSA modulus is the General Number Field Sieve. Through the software optimized implementation of GNFS with RSA-768, we extracted nine main calculation components from the lattice sieve. Detail descriptions and comprehensive analysis of the properties about calculation, memory and communication to the nine components were given in this paper, which makes it possible to use of a variety of computing platforms, such as CPU, FPGA, CELL, and GPU etc, to accelerate the realization of GNFS.
Application of Decision Tree Algorithm in Lumber Hierarchies
Authors: Guo Dan
Published: February 2012

The decision tree algorithm is a kind of approximate discrete function value method with high precision, construction model of classification of noise data is simple and has good robustness etc, it is currently the most widely used in one of the inductive reasoning algorithms in data mining, extensive attention by researchers. This paper selects the decision tree ID3 algorithm to realize the standardization of lumber level division, to ensure the accuracy of the lumber division, while improving the partition of speed.
Structure and Mechanical Properties of Porous Ultra-High Molecular Weight Polyethylene
Authors: Xiao Jiu Mei
Published: February 2012

The porous UHMWPE were prepared by wet process and biaxial stretching. The scanning electron microscopy (SEM) experimental results indicated that there were two discernible components: microfibril bundles and microfibril networks in the porous biaxial UHMWPE. The higher draw ratio along the longitudinal direction (the machine direction) contributed more to orientation of the UHMWPE fibrils. Along the transverse direction, fibrils were torn, and more microfibrils network with larger size formed. The mechanical test results showed that along the longitudinal direction, the UHMWPE exhibited higher tensile strength and lower elongation-at-break.
The Optimization of Parameters in Refining Process Based on LINGO Software
Authors: Tang Wei , Zhao Yan Zi
Published: February 2012

APMP high-consistency refining process is a complex energy-consuming process, under the unchanged condition of equipments, it’s very important to optimize the refining quality, yields and costs. Through analyzing the refining process, the mathematical model about optimizing three parameters simultaneously is proposed, and solved by the mathematical software with powerful function(LINGO), By comparing, the results show: for one thing, the different indices tendency determine the optimized degree; for another, the indices of quality and yields after optimization has been raised more than that before optimization, and the costs reduce obviously, the improvement of economic benefits is considerable for a larger enterprise.
The Synthesis and Performance Study of Complex of Calcium(II) and Maleic Amide Acid
Authors: Kang Jie , Li Kan She , Chen Chuang Qian , Zhang Run Lan
Published: February 2012

Complex of calcium(Ⅱ) and maleic aniline acid had been synthesized based on maleic anhydride, aniline and calcium sulfate. Some effects of combined sequence and the structure and performance has been studied, Based on experiments one kind of Calcium maleic aniline acid salt were synthesized. The results showed that the complex of calcium(Ⅱ) with N-phenyl maleamic acid is light yellow powder, and its melting point is 195.25 °C. The chemical formula of the complex agreed with CaL2nH2O, where the N of amide group and O of carboxy group coordinated with calcium. The complex could be used as a thermal stabilizer for PVC due to its good effect on thermal stability of PVC. The molecular formulas of rare-earth maleic aniline acid salt were confirmed by element analysis DSC and UV. The thermal stabilities of calcium maleic aniline acid salts were researched through static methods. Indicated that the calcium maleic aniline acid salts has certain heat-stable function to PVC.
Preparation and Mechanical Properties of Zein/PVA Nanofibrous Membranes
Authors: Liu Feng Xia , Liu Yong Jia , Cai Hong Li , Luan Jia Shuang , Zhang Mei
Published: February 2012

This paper describes the morphology and mechanical properties of novel electrospun zein based fibrous membranes. From the results, due to adding PVA, it was found that the electrospun fibers of zein can turn into a new strong membrane. The fibrous membranes were characterized by tensile testing, scanning electron microscopy(SEM) and differential scanning calorimetry(DSC). Effect of PVA was analyzed as one of the most significant factors affecting the mechanical characterization of fibrous membranes. The compatibility of zein/PVA nanofibrous were also analyzed by using DSC method.
Computer Simulation on Key Structure Parameters of Foam Generator for Dust Control in Underground Coal Mines
Authors: Wang He Tang , Wang De Ming , Ren Wan Xing
Published: February 2012

Foam is a high efficient technology for controlling dust in underground coal mine,and foam generator is one of the core components of the technology. Aiming at designing the key structural parameters of foam generator scientifically, the velocity and pressure distribution of foam generator under different parameters were simulated and displayed by CFD (Computational Fluid Dynamics) software. The results show that the intensity of gas-liquid mixture in foam generator reaches the maximum when the vortex generator is 24mm away from the throat and the baffle with a 45° angle. Under the circumstances, the pressure is well-distributed around the vortex generator and the outlet of foam generator, and the foaming effect best.
Extended Contract Nets Application in Wood Drying Kiln
Authors: Zhang Xue , Liu Ya Qiu , Hua Jun Peng
Published: February 2012

The article aims at the problems such as the traditional contract nets model’s communication traffic is too heavy in the consultation process; task’s partition is fixed; evaluation index is not comprehensive, proposes a contract nets improvement method based on the bidding threshold and evaluation function by combining the response threshold model of the ant colony algorithm. This method introduce fuzzy synthetic computation, finding the potential cooperation relations between node agents, bottom-up decomposing the complex task, effectively reduce the negotiation time and communication flows, improve the efficiency of the system. The thesis combines wood drying application feature, and puts forward the improved model’s experimental simulation in wood drying kiln. The result shows that the improved method can effectively improve the performance of the Contract Net Protocol in large-scale multi-agent system. It provides technical basis for the realization of wood drying cluster control.
Degradation of Orange IV Catalyzed by Fe/S/GAC in the Presence of H2O2
Authors: Zhang Ying Jie , Xu Shu Fen , Liao Xia , Yang Rong , Li Da Peng
Published: February 2012

A new heterogeneous Fenton-like catalyst of Fe/S/GAC was prepared by granular activated carbon (GAC) soaked in solution of (NH4)2S2O8 and Fe(NO3)3. The effect of the concentration of (NH4)2S2O8 , Fe(NO3)3, drying temperature and different catalysts on the catalytic reactivity of catalyst was discussed. The removal rate of Orange IV was used to express the catalytic reactivity of the catalyst. The prepared catalysts were characterized by X-ray diffraction (XRD), specific surface area (BET) and scanning electron microscopy (SEM). The removal rate of Orange IV followed second-order kinetics. The catalyst of Fe/S/GAC has higher catalytic activity than that of Fe/GAC.
The Application of PID Based on Optimized RBF in Thickness Control of Strip Steel
Authors: Yu Yu Zhen , Ren Xin Yi , Deng Chun Yan , Wang Xiao Hui
Published: February 2012

The strip thickness control system is difficult to establish an accurate mathematical model, and traditional PID control strategy has a poor adaptive ability, so the effect of control is always not satisfying. According to the problems above, a new control strategy of self-tuning PID controller based on RBF neural network whose parameters are optimized by PSO algorithm is proposed in the paper. The control method integrates advantages of RBF neural network as well as PID controller and good global search capability of PSO algorithm. The simulation results indicate that the method not only improves control performance and dynamic quality, but also has strong self-adapting ability and robustness. It achieved a very good control effect when used in strip thickness control system that proved the correctness and effectiveness of the control method.
3P4R Grinding Robot Kinematics Analysis
Authors: Song De Zheng , Yun Chao , Zhang Dong , Fan Ming
Published: February 2012

For the problems that the dexterity of movement was not enough, the grinding path was uncontinuous as well as the accuracy and efficiency were influenced while the gripper needed replacing, when complex curved workpiece was under grinding by six freedom degrees grinding robot, a new type redundant grinding robot, PPPRRRR, was proposed. A new type robot system coordinate and kinematics model of robot space were founded by the homogeneous transformation. Robot kinematics equations were derived. By ADAMS, the work space of robot was obtained. The relative position of the grinding contact wheel and robot was optimized by orthogonal test method. It lay the foundation for in-depth study of this type of grinding robot.
The Designing of Missile Tail Testing Simulation Training System
Authors: Xue Xue Dong , Cheng Xu De , Xu Bing , Zhang Wei Xin , Zhang Dong Yu
Published: February 2012

This paper constructs a missile tail testing simulation training system based on virtual closed-loop control technique, event driven engine technique and PCI bus technique. It expounds specifically the system design method, realization of system hardware as well as simulation software system design, and puts forward the idea to apply the event driven technique in MCU system, which improves the programming efficiency and has guidance and reference significance for the research and development of similar simulation training equipments.
Aviation-Engine Lubricant System Fault Diagnosis Based on Wavelet Neural Networks
Authors: Jiao Zhun , Zhang Rong
Published: February 2012

Fault detection and diagnosis methods for non-linear system based on wavelet neural networks are researched. Wavelet analysis and back propagation neural networks are fused, and the algorithmic is inferred. Method of wavelet neural networks is used in fault diagnosis for the lubricant system of the aero-engine. Results of simulation and tests show that, this method, which is good to fault diagnosis for non-linear systems, does better in convergence speed, and is not sensitive to the inputs of the net.
The Collision Detection Technology Based on the OpenGL in Virtual Scene
Authors: Chen Man Qing , Zhang Geng Yun , Cheng Guo Qing
Published: February 2012

The research object is a collision about a Virtual man roaming in the three-dimensional virtual scene. The collision behavior was studied and implemented in the three-dimensional scene based on the OpenGL. This provides the technical supports for roaming in a realistic three-dimensional scene.
Simulation of Machining Errors Compensation of CNC Spiral Bevel Gear Grinding Machine
Authors: Yan Hai Yan , Zeng Tao
Published: February 2012

Taking the eccentricity error of workpiece’s axis as an example, the real cutting pathes on the spiral bevel gear’s tooth surface and the normal errors were obtained according to each machining position. By decoupling error compensation motions, the compensation values of three translational and two rotational axes were obtained. After compensating, the tooth form errors were reduced largely. This compensation method is closer to the fact of gear grinding and the compensation effect is better than the method of adjusting machine setting parameters.
Design and Implementation of an Embedded Intelligent Instrument for Pure Electric Vehicles
Authors: Li Deng Feng , Li Hu , Wang Huan Huan , Bai Yun Ting
Published: February 2012

In order to deal with the dissatisfaction of traditional automobile instruments applied in pure electric vehicles, an automobile intelligent instrument is designed to meet new requirements of the pure electric vehicles by combining the embedded development board with the embedded configuration software MCGS. In this instrument, the hardware development platform is developed to communicate with the main controller of vehicles by extending CAN bus interfaces on the embedded development board, the main control chip of which is S3C2440. Moreover, the embedded configuration software MCGS is adopted to achieve the software design of the instrument system. Compared with traditional automobile instruments, the intelligent instrument is of high reliability, high precision and diversifications in display interfaces and can be installed in pure electric vehicles as a universal instrument.
The System of Spindle Optimization Design Based on GA
Authors: Wang Peng Jia , Guo Chen Guang , Liu Yong Xian , Sheng Zhong Qi
Published: February 2012

Aiming at the optimization design of spindle, this paper introduces deflection constraint, strength constraint, corner constraint, cutting force constraint, the limit of torsional deflection, boundary constraint of design variable, dynamic property constraint , realizes the expression of the mathematical model of the spindle optimization design. Through the introduction of the real number code rule, the selection operator is built by adopting the optimum maintaining tactics and proportional selection, the crossover operator is built by using the method of arithmetic crossover and the mutation operator is built by using the method of uniform mutation. In the platform of VC++, the system of spindle optimization design based on GA is built. The analysis of the example shows that using the genetic algorithm to optimize the spindle can ensure the convergence of the optimization course, expand the search space, and the effect of optimization is obvious.
A Simulation on Aerodynamic Noise of an Air-Conditioning Duck
Authors: Shi Wen Ku , Yao Jian Peng , Hou Suo Jun , Guo Fu Xiang , Fang De Guang
Published: February 2012

The transient flow field is needed in order to predict the aerodynamic noise of an automotive HVAC duck by conventional methods. However, it is time-consuming when are several improved schemes .To solve the problem, schemes with large sound power can be discarded using Broadband Noise Source (BNS) model at first. Then, the best scheme can be found after the transient flow simulation .In this paper, an automotive HVAC duck is used as an example. Firstly BNS is used to predict which scheme is noisier, secondly the aerodynamic noise is computed using Fluent coupled with Sysnoise. At last they come to the same conclusion. The simulation results indicate BNS model can be used to find which scheme is the best without computing the transient flow field. So it can shorten the cycle of developing new products.
Fault Diagnosis Analysis of Power Transformer Based on PSO-BP Algorithm
Authors: Sun Hui Qin , Xue Zhi Hong , Sun Ke Jun , Wang Su Zhi , Du Yun
Published: February 2012

BP neural network is currently the most widely used of neural network models in practical application in transformer fault diagnosis. BP algorithm is a local search algorithm which is easy to make the network into the local minimum values. Network training results are poor. It discusses PSO-BP algorithm which combines the particle swarm optimization (PSO) algorithm with the BP algorithm in this paper. It uses PSO algorithm to optimize the BP network’s weights and threshold. It is used in power transformer fault diagnosis. Experimental data results show that PSO-BP network fault diagnosis accuracy is higher than BP algorithm.
Noise Prediction of Liquid Rocket Engine by the Software AutoSEA2
Authors: Duan Xiao Long , Liu Xiao Yong
Published: February 2012

Because of the high-cost of the spaceflight launching, the reliability of the payload must be ensured in the high level acoustic energy produced by the first stage rocket engine. It’s the base for ensuring the normal work of the instruments during the lift-off. In this paper, the exhaust noise and the specific sound field produced by the liquid rocket engine on the ground-test system were measured, and the statistical energy analysis model was built to predict the noise environment of the rocket engine. In order to obtain the noise spectrum loaded on the fairing and the instrument cabin during the lift-off, two measurements were made and some measuring locations were set for each test. During the testing, the sound pressure level around the engine spout and the corresponding heights of the payload cabin were measured. By comparing the data derived from different measuring locations for the same measurement and the different measurements for the same location, the characteristics of the noise field was obtained. Results showed that the measured data agreed well with the predicted data used AutoSEA2 software.
Numerical Simulations of Long-Rod Projectile Penetrating Multi-Layer Target
Authors: Dong San Qiang , Yu Wen Li , Wang Tao , Gao Yun Liang
Published: February 2012

Parameterized FEM models of multi-layer target are established. Base on the models, the process of long-rod projectile penetrating multi-layer target with two different angles of incidence are carried out by means of FEM analysis program LS-DYNA and the influences of the incident angle and multilayer mediums are studied. The results show that when vertical penetrating the multi-layer target in vicinity of the free surface the projectile underwent large deflexion and eventually escaped from the rock layer and when oblique penetrating the target the projectile penetrated claypan layer, rock layer, grit layer and concrete layer in turn. Different mediums brought different influences on penetration effects. The models and results could provide reference for projectile design and efficiency evaluation.