bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Experimental Study of a Vespiary Exsector
Authors: Tang Yan Hai , Hu Jin Bing , Yang Ling , He Pei Xiang
Published: February 2012

The traditional removal method of a vespiary is labor-costing with characteristics of low efficiency and safety. According to the work high above the ground with hidden risk of the vespiary removal, a mechanical vespiary exsector was designed. The exsector is driven by a high speed motor, and the vespiary is removed by a cutting wire with high revolution speed. The cutting part can rotate 90 through drawing a pulling rope. A 2-layer sealing mechanism is operated through another pulling rope. The vespiary exsector has overall characteristics of small scale, light weight and good dexterity. Orthogonal experiment results show that factors of cutting speed and feed speed significantly contribute the width of cutting slot at the significance levels of 0.01 and 0.05 respectively, and the optimum cutting parameters are: cutting speed 10000rpm, feed speed 0.04m/s and diameter of the cutting wire 2mm.
A Delay-Dividing Approach for Stability of Neutral System with Mixed Delays
Authors: Qiu Fang , Zhang Quan Xin
Published: February 2012

This paper studies the stability problem for the neutral system with mixed delays. By constructing a novel Lyapunov functional based on a delay-dividing approach, some delay-dependent stability criteria are derived to guarantee the stability of the neutral system. It is established theoretically that the criteria are less conservative than recent reported ones. Two numerical examples are demonstrated to illustrate the effectiveness of the proposed results.
A Fast Multipole Boundary Element Method Based on Legendre Series for Three-Dimensional Potential Problems
Authors: Yu Chun Xiao , Yu Hai Yuan , Chen Yi Ming
Published: February 2012

Vectorization expressions of a Fast Multipole Boundary Element Method (FM-BEM) based on Legendre series are presented for three-dimensional (3-D) potential problems. The formulas are applied to the expression of fundamental solutions for the Boundary Element Method(BEM). Truncation errors of the multipole expansion and local expansion are deduced and analyzed. It shows that the errors can be controlled by truncation terms.
Analysis of Combination Mode about Vibration Mixer in Concrete Mixing Mechanics
Authors: Shen Hong , Duan Zhi Shan , Li Fei
Published: February 2012

The author, in this text, introduces the methods of the vibratory mixing, and gives the comparison and evaluation of the existent vibratory mixing methods. And this paper presents an improved twice vibratory mixing programs, such as the use of chaotic vibration exciter in the concrete preparation.
A Study on Dynamic Adjustment Behavior of Asset-Liability Ratio of Manufacturing Listed Companies in China
Authors: Wang Liang
Published: February 2012

The paper studies on adjustment behavior of asset-liability ratio of manufacturing listed companies in China from a dynamic perspective. Based on the panel data from 2001 to 2008, this paper conducts system GMM methods to estimate. Results show that asset liquidity, non-debt tax shield, growth and net profit are negatively correlated with asset-liability ratio of China’s manufacturing listed companies, company size and asset structure are positively correlated with the asset-liability ratio, macroeconomic situation also has a significant impact on the asset-liability ratio; Companies can only make partial adjustment after deviating from optimal asset-liability ratio level because of the adjustment costs, the adjustment speed is about 0.345，the corresponding adjustment half-period is 2.01 years, the adjustment costs of asset-liability ratio of manufacturing listed companies in China are higher than that in the developed countries.
Application of Algorithm of Hidden Markov Model and High-Order Spectrum in Fault Diagnosis of Power Electronic Circuit
Authors: Yan Ren Wu , Zhou Li , Zhong Zhan Ying
Published: February 2012

This paper presents a method of applying the discrete hidden markov model and high-order spectrum to fault diagnosis of power electronic circuit.With bispectrum analysis, an ARMA model parametric bispectrum estimation is presented for Fault feature extraction firstly,and then fault modes were trained and recognized by Discrete Hidden Markov Model. Finally, electric locomotive main converter of SS8 type is used as an example to illustrate the new approach of fault diagnosis. The experimental results show that the proposed method has a high correct rate.The correct rate of the proposed method is 100%in the case of no noise or 5% noise whicn is 16.11% and 23.79% higher respectively than that of DHMM and BP neural network methods. So the method has practical value.
Cost Minimum Proportioning of Non-Slump Concrete Mix Using Genetic Algorithms
Authors: Rahman Md. Moshiur , Jumaat Mohd Zamin
Published: February 2012

This paper presents a generalized formulation for determining the optimal quantity of the materials used to produce Non-Slump Concrete with minimum possible cost. The proposed problem is formulated as a nonlinear constrained optimization problem. The proposed problem considers cost of the individual constituent material costs as well as the compressive strength and other requirement. The optimization formulation is employed to minimize the cost function of the system while constraining it to meet the compressive strength and workability requirement. The results demonstrate the efficiency of the proposed approach to reduce the cost as well as to satisfy the above requirement.
An Improved Difference Method Based on Three Asymmetric Frames and its Applications in the Vehicle Detection
Authors: Liu Zhan Wei , Zhao Wei Hua , Wang Wei , Zhao Zheng Xu
Published: February 2012

Original difference method based on three sequential frames is a common method in the moving objective detection. After the introduction of the original method, the formation cause of the internal cavity in vehicle region was analyzed. Then, an improved difference method based on three asymmetric frames, which were abstracted according to the judgment rule of optimal frame interval, has been proposed in this paper. The area of the moving vehicle region is assumed as the criterion to calculate the best frame interval. In the improved method, the best benchmark frame and the best auxiliary frame were firstly abstracted out and used to subtract the current frame separately. Subsequently, the two difference images were transformed to binary images separately. Lastly, the final moving vehicles were detected in the current frame after logical "and" operation was carried out between the two binary images. The experimental results showed that the improve difference method based on three asymmetric frames can effectively reduce the internal cavities in the vehicle region, comparing with the original one.
Adaptive Trajectory Tracking Control of Linear Ultrasonic Motor Based on Fuzzy Recurrent Neural Network
Authors: Wang Jun , Li Xiao Hui
Published: February 2012

In view of the strong non-linear and time-varying characteristics of linear ultrasonic motors, a fuzzy recurrent neural network controller is put forward. In order to improve the control of the convergence speed and robustness of the proposed controller, the differential evolution algorithm is used for the rapid preliminary off-line optimization of the weights and parameters of network，and then combines the adaptive law and BP algorithm and gradient descent optimization mechanism for learning and accurate optimization. The results show that the fuzzy recurrent neural network controller is better than PID and self-structuring neural network controller, and has a good anti-interference capability.
Adaptive Terminal Sliding Mode Control of Opto-Electronic Stabilized Platform Based on Acceleration Feedback
Authors: Ren Yan , Liu Zheng Hua , Zhou Rui
Published: February 2012

In order to overcome the effect of the friction and the nonlinear disturbance in the high precision Opto-electronic(EO) servo-stabilized platform system, adaptive terminal sliding mode control (ATSMC) base on acceleration feedback is introduced in the system. Different to traditional sliding mode control, a terminal sliding surface is introduced to assure finite convergent time of control errors on the surface. In addition, due to unknown bound of uncertainty, an adaptive law is derived to compensate the effect. As a result, in this control strategy, the ATSMC controller was used to improve the tracking accuracy in the position loop; the acceleration feedback controller was introduced to compensate for friction torque and disturbance. The simulation results show the proposed control scheme to be effective.
An Auto-Focus Algorithm of Fast Search Based on Combining Rough and Fine Adjustment
Authors: Lin Zhao Hua , Liu Xin , Zhang Yu Liang , Zhang Shu Mei
Published: February 2012

A coarse and fine combined fast search and auto-focusing algorithm was suggested in this paper. This method can automatically search and find the focal plane by evaluating the image definition. The Krisch operator based edge energy function was used as the big-step coarse focusing, and then the wavelet transform based image definition evaluation function, which is sensitivity to the variation in image definition, was used to realize the small-step fine focusing in a narrow range. The un-uniform sampling function of the focusing area selection used in this method greatly reduces the workload and the required time for the data processing. The experimental results indicate that this algorithm can satisfy the requirement of the optical measure equipment for the image focusing.
Based on Power Bond Graph’s Hydraulic System of Energy Release Research
Authors: Tian Yong , Gao Hong Wei , Liu Bo , Li Wei Qi
Published: February 2012

Describes the working principle of hydraulic system elevator, established the power bond graph and the state equation of the energy release circuit, and the simulation results prove the feasibility of energy release circuit.
Analysis on Oil Film Temperature Field of Hydro-Viscous Variable Speed Clutch
Authors: Bao Ji Hua , Jiang Xue , Yu Yan , Wang Ling , Su Pei Pei
Published: February 2012

According to the structure and working principle of hydro-viscous variable speed clutch, the energy equation of oil film between the friction discs is derived. After solving the pressure and velocity of oil film, the analytic solution of energy equation and the oil film temperature distribution is acquired. It is shown that the temperature rise of oil film is proportional to the square of angular speed difference and the forth power of friction disc radius, and is inversely proportional to the flow flux and the film thickness. The above conclusions have important significance to reasonably choose lubricant oil and the friction disc material, and ensure the normal work of hydro-viscous variable speed clutch.
Application of RBF Neural Network in WEDM
Authors: Zhang Shi Ping , Ding Yi Chao , Wang Jing , Li Yuan Hui
Published: February 2012

It is difficult to build a strict mathematical model for WEDM due to the complication of the machining process and the nonlinear relation between process parameters and process targets. The neural network is suited to the modeling of complex system, because it has the functions of self-organized, self-learning and associative memory, and properties of distributed parallel type and high robustness. Therefore, this paper attempts to use the RBF neural network for the process modeling of WEDM.
Application of Pre-Stack Inversion to a Complex Reservoir Prediction: a Case Study in LG34 Area, Tarim Basin
Authors: Zhang Xin Chao , Sun Sam Zan Dong , Wang Hai Yang , Zhang Yuan Yin , Gao Hong Liang , Jing Bing
Published: February 2012

The Donghe Sandstone formation (DS fm. for simplicity) presents an excellent thin condensate gas reservoir in LG34 well area, Tarim Basin. Unfortunately, drilling results show that the reservoir is thin, deeply buried (below 5000m) and mix lithologies. Pre-stack inversion and fluid identification is implemented in this area. The feasibility and validity of pre-stack inversion for this kind of reservoir is tested, since that application of pre-stack inversion in this area is for the first time. A new rock physics model is used for estimating rock velocities and elastic attributes, and cross-plots of Poisson's ratio (σ) again LambdaRho (λρ) is found to be more favorable for lithofacies identification. Then, pre-stack inversion which uses seismic data with careful amplitude processing is performed to predict the reservoir. The inversion results agree and tie with most wells, suggesting that the pre-stack inversion is viable process for this complex lithological reservoir prediction in the area.
A Numerical Analysis of Soil Arching in Piled Embankments
Authors: Zhao Min , Cao Wei Ping
Published: February 2012

Soil arching has important influence on the behavior of piled embankments. How to calculate stress concentration ratio is of great concern when designing embankment over soft soils reinforced by rigid concrete piles. A numerical analysis by using a commercial FEM program was conducted to reveal the mechanism of soil arching in piled embankments. And also, the influence of embankment height, pile-soil relative displacement, cohesion and internal friction angle on the equal settlement plane was evaluated. The results indicate that the stress concentration ratio varies with the pile-subsoil relative displacement and has upper and lower bound value. The effect of pile-soil displacement and the strength parameters of embankment material on the equal settlement plane can be neglected. It was also found that the equal settlement plane height is equal to 1.6 times the pile-cap clear spacing. When the ratio of embankment height to the pile-cap clear spacing is greater than 1.6, no apparent differential settlement will occur on the embankment surface.
A Study on PID Control and Simulation Based on BP Neural Network
Authors: Zhai Fang Fang , Ma Shao Li , Liu Wei
Published: February 2012

This paper introduces the neural network PID control method, in which the parameters of PID controller is adjusted by the use of the self-study ability. And the PID controller can adapt itself actively. The dynamic BP algorithm of the three-layered network realizes the online real-time control, which displays the robustness of the PID control, and the capability of BP neural network to deal with nonlinear and uncertain system. A simulation is made by using of this method. The result of it shows that the neural network PID controller is better than the conventional one, and has higher accuracy and stronger adaptability, which can get the satisfied control result.
An Improved Composite Grating for Phase Unwrapping in 3-D Measurement of Specular Objects
Authors: Liu Shu Gui , Ji Li Shuan , Han Shu Jian , Zhang Xiao Jie , Zhang Hong Wei
Published: February 2012

The paper proposes a novel method of improving the traditional composite grating in 3-D measurement of the specular objects. The traditional composite grating is improved by altering the intensity of the center stripe in one of the fringes. The improved composite grating not only includes the primary phase information, which is modulated by the object's surface, but also includes the code information, which is necessary for the phase unwrapping. The paper introduces the formation of the improved composite grating, demodulating the composite grating and computing the unwrapped phase based on the altered fringe. Simulated and actual experiments prove that this method is valid. Because of projecting a single composite grating, the method is suitable for dynamical measurement.
Design on Geographical Multi-Scale 3D Symbol Library
Authors: Wei Yong Jun , Ji Guo Jie , Zhao Xiao Lin , Chen Ying Dong , Han Peng
Published: February 2012

3D Geographic Information System (3D GIS); 3D symbol library; Modeling. Abstract. The 3D symbol is the basic approach to represent geographic themes in 3D GIS. In this paper, a multi-scale data model for 3D symbol library is designed to solve the problems in the organization, storage and display for multi-scale symbols. The particle system and animation technology are utilized in dynamic display of 3D symbols. A multi-scale and dynamic 3D symbol library system prototype is constructed and applied in many 3D visualization systems. The results show that the 3D symbol library based on multi-scale and dynamic technology presents high performance.
Robust Fault Detection for Nonlinear Systems with Distributed Delays
Authors: Liu Chuan Xi
Published: February 2012

This paper focuses on the problem of robust fault detection for a class of nonlinear time-delay systems. The system under study involves distributed time delay, unknown inputs and nonlinear fault distribution functions which is dependent on the inputs, outputs and states of the system. By applying Lyapunov stability theory and free-weighting matrix methods, a novel delay-dependent sufficient condition, which is in terms of linear matrix inequality (LMI) and ensures existence of the desired robust fault detection observer for the nonlinear systems, is proposed. When the LMI is feasible, an explicit expression of a desired observer gain is given. Based on the observer technique, desired approach to robust fault detection is presented
Intelligent Monitoring System for Parking Lots Based on 1394 Camera
Authors: Liu Chun Ling , Cui Wen Cong , Wang Jun Sheng
Published: February 2012

Nowadays almost all the park toll management system in use is based on charging by operators, up and down the barrier gate manually or the motorman get through barrier gates by swiping card. This paper try to solve the problem by designed a intelligent park system based on image processing. The system capture video frames through camera, recognizing the vehicle license by pattern recognition, sending command throng CAN bus to control the barrier gate, what is more, the states of control system is shown on LCM.The system has realized automatic control of barrier gates without parking, which, of course, slows down the vehicle wear and tear, greatly improves the efficiency, reaching the goal of green, energy saving and environmental protecting.
Effect of Carbon Black Pigment on the Surface Resistivity of the Black Silicone Thermal Control Coating
Authors: Barekat Masoud , Razavi Reza Shoja , Bastani Saeed
Published: February 2012

Black thermal control coatings based on carbon black are used widely in space technology. The thermal control coatings are exposed to electrostatic charges that develop on the external surface of the spacecraft. The charges would otherwise accumulate to cause arcing and possible damage. The carbon black pigment provides sufficient electrical conductivity to dissipate electrostatic charges. In this study, The influence of the type and percent of carbon black on the surface resistivity of the coating produced by polydimethylsiloxane and carbon black was studied. Results indicated that the weight fraction of the pigment in coatings fabricated by carbon black with a sponge-like structure are lower compared to coatings fabricated by carbon black with a nonporous structure also, the surface resistance decreased with increasing pigment contents.
Research on the Precession Angle (PA) Adopted in Polishing Large Aspheric Mirror
Authors: Wang Chun Jin , Yang Wei , Wang Zhen Zhong , Guo Yin Biao , Pan Ri , Lin Jian Hua
Published: February 2012

This paper focus on the relationship between PA and the distribution of polishing pressure, on the basis of the theory that the distribution of polishing pressure is a Modified Gaussian Function and has highly symmetry. Through the simulation experiments, the optimum PA has been determined. And it’s further validated that this optimum PA fits for polishing large aspheric mirror under the conditions with both different internal pressure and bonnet decrement by a series of simulation experiment. It’s also found that PA makes little difference to the size of the contact area and the bonnet decrement has greater influence to the size of the contact area than the internal pressure.
Design of Wireless Network Intelligent Gas Meter
Authors: Feng Ji Qin , Wu Min , Lu Jin , Chen Zi Ran
Published: February 2012

According to gas meter, including the traditional mechanical meter, IC card meter ,has the drawbacks of meter reading inconvenience and no control table function, The design of a intelligent network gas meter has the wireless transceiver function, adopted the single-chip radio frequency transceiver chip CC2500, not only simplify the meter reading process, and promote the automatic management of gas company. The wireless network intelligent gas meter system has stable performance, low power consumption, reliable communications, good anti-jamming performance.
A Strategic Research on Technological Innovation of Tangshan Bay
Authors: Li Xu Dong , Sun Jian Chun
Published: February 2012

The whole mode of technological innovation in Tangshan should rely mainly on the imitating innovation or the followed innovation, partly on the primitive innovation. It should be carried on according to enterprise's detailed conditions to employ specifically. The paper analyzed the Silicon Valley of American, Gulf of Tonkin of Japan and the Chinese Yangzi Delta area, and found they had different innovation pattern and respective superiority. These provided some experience of scientific and technological innovation for Tangshan bay. The essay planned the strategy from three aspects, including the strategic mentality, the strategic choice and the strategic measure. It pointed out the Tangshan bay should fully use nearly alliances, highlight the superiority outward, play jointly with other cities and insist opening-up independently.
Fault Diagnosis System Based on UN-150ZB Mobile Rail Flash Butt Welding
Authors: Zhao Hong Guang , He Chao , Zhang Xi , Lv Qing Bing
Published: February 2012

As the fault of the UN5-150ZB rail flash butt welding machine was difficult to be detected and diagnosed, a self-diagnosis system based on communication between PC and PLC was developed to realize fault detection and diagnosis for site operation. The system was implemented by transporting input and output information which including digital and analog, and states of PLC to PC. The computer diagnosis software could judge different fault types automatically on different diagnosis interface. Diagnosis results were printed on screen in text and graph that could provide information of fault types and phase. With the help of diagnosis results, welding productivity can be improved and problems of the equipment can be solved rapidly. Practical application showed that the self-diagnosis system provided a good solution to the fault detection and diagnosis.
Fabrication and Characterisation of Nanofibres by Meltblowing and Melt Electrospinning
Authors: Nayak Rajkishore , Kyratzis Ilias Louis , Truong Yen Bach , Padhye Rajiv , Arnold Lyndon , Peeters Gary , Nichols Lance , O'Shea Mike
Published: February 2012

Fabrication of nanofibres has become a growing area of research because of their unique properties (i.e. smaller fibre diameter and higher surface area) and potential applications in various fields such as filtration, composites and biomedical applications. Although several processes exist for fabrication of nanofibres, electrospinning is considered to be the simplest. Most of the research in electrospinning is based on solution rather than melt. The feasibility of fabricating nanofibres of polypropylene (PP) by meltblowing and melt electrospinning has been investigated in this paper. In meltblowing different fluids such as air and water were fed at different inlets along the extrusion barrel for the fabrication of nanofibres whereas in melt electrospinning it was achieved by using different additives. The results obtained by using water in meltblowing were better with respect to the morphology and fibre uniformity compared to air. In melt electrospinning although all the additives (i.e. sodium oleate (SO), polyethylene glycol (PEG) and polydimethyl siloxane (PDMS)) helped in reducing the fibre diameter, only SO was effective to reduce the diameter down to nanoscale. It was concluded that both the solvent-free processes have the potential to substantially increase the production of nanofibres compared to solution electrospinning.
Improve the Fatigue Performance of Welded Joints with Undercuts by TIG Dressing Treatment
Authors: Wu Liang Chen , Wang Dong Po
Published: February 2012

Undercuts often exists in the surface at weld toe. Undercuts affects the capability of weld subjected to dynamic loading greatly and fatigue cracks usually initiate from these zones with undercuts. Combining with low-alloy middle strength steel 16Mn，study of increasing the fatigue strength and the fatigue life was carried out. Compared with specimen without defects, the fatigue strength of specimen with undercuts has been increased by 10~20%. Study also shows that comparing with as-welded specimen with defects, with TIG dressing treatment, fatigue strength of cruciform weld joint of steel 16Mn has been increased by 70%, fatigue life by 5~8 times. Compared with as-welded specimen without defects, fatigue strength has been increased by 34%, fatigue life by 3~4 times. Undercuts have no adverse effects on fatigue property of welded joints under TIG dressing.
Uncertainty Evaluation of SEM-Based Nanoroughness Measurement
Authors: Zhao Feng Xia , Wang Qing Hai , Zhang Lin Na , Zheng Peng
Published: February 2012

In metrology, a measurement process without uncertainty evaluation is incomplete. The same applies to nanoroughness metrology. In this paper, Scanning Electron Microscopy (SEM） measurement uncertainty of nanoroughness is studied based on ISO Geometric Product Specification and Verification (GPS). The uncertainty propagation model of SEM-based nanoroughness measurement is presented. The evaluation model of SEM-based standard measurement uncertainty is conducted. As a case study, the line edge roughness uncertainty produced by the JSM-6700F SEM is evaluated.
Effects of Temperature and Strain Rate on Numerical Sigmoid Curve for AZ41 Magnesium Alloy
Authors: Fereshteh Saniee Faramarz , Barati Farzan
Published: February 2012

One of the ways for determination of flow curves is the application of a ring test. Using this method, friction in the interface between the die and the specimen leads to a bulging of the sample and thereby to an inhomogeneous stress and strain state. The calculation of the flow stress from experimentally determined force–displacement curves implies a uniaxial stress state, but this will produce an error because of the above-mentioned bulging, when friction occurs. One method of avoiding these sources of error is to use the sigmoid curves, but the sigmoid curves are varied by the change of temperature and strain rate. Calculations of numerical sigmoid curves were done by the use of an iterative procedure, applying a corrective function. The paper presents a complete investigation of the AZ41 magnesium alloy sigmoid curves at temperature ranging between 473 K and 513 K and strain rates ranging between 0.025 s-1 and 0.00025 s-1 . Ring tests are used to determine the numerical sigmoid curves sensitivity to temperature and strain rate.
Tracking Error Estimate for Theodolite Based on General Regression Neural Network
Authors: Li Miao , Gao Hui Bin
Published: February 2012

To efficiently evaluate the tracking index of theodolite ,as well as avoiding influence resulted from higher harmonics when used opto dynamic target and use equivalent sine to evaluate the tracking index, in this paper, we resorted to General Regression Neural Network to do the new research on theodolite tracking accuracy evaluation method. Experimental results indicate that the method realized the equivalent sine to evaluate the tracking index of theodolite and avoided the higher harmonics influence with opto dynamic target. The research in this paper has important value to the engineering practice.
Properties of Electrospark Deposited YG8 Coatings on AISI H13 Steel
Authors: Zhang Jian , Guo Cean , Shang Guang Ming
Published: February 2012

YG8 coatings were deposited on AISI H13 steel substrates by means of electrospark deposition (ESD). The coatings were characterized in terms of their microstructure, hardness, friction and wear behavior. Micro-indentation and tribometer testers were employed to measure the mechanical properties of YG8 coatings and AISI H13 steel. The results showed that the hardness of the coatings ranged from 1820 to 1880 HV, with a higher value than that of AISI H13 steel (510HV). The average coefficient of steady-state friction of the coatings under the loads of 10N, 20N and 30N against Si3N4 balls were 0.39, 0.46 and 0.38, with a lower value than that of AISI H13 steel under the load of 10N and 20N(0.65). The wear mechanism in the electrospark deposited YG8 coating could be mainly characterized by micro-abrasive wear, delamination wear and oxidative wear while the dominant wear mechanism for AISI H13 steel was a severe abrasive wear.
An Empirical Study on Consumer Purchasing Intention in Online Group-Buying
Authors: Shi Bin
Published: February 2012

Online group-buying characterized by Groupon model is developing rapidly in recent years. This study presents three perspectives of price stimulation, demand extendibility, and perceived trust to investigate factors influencing consumer participation intention in Online group-buying. Based on the foundation of existing empirical research results, an empirically validated comprehensive model is proposed and tested.
Analysis of Leveling Control System via Iterative Linear Matrix Inequalities with Full Order Observer
Authors: Sun Jia , Wu Yu Hou , Xiao Nan
Published: February 2012

Abstract. This paper investigates leveling control system of suspended access platform using an observer-based controller. Uncertain linear systems for leveling control are derived and represented in terms of a set of matrix inequalities. In the system, all state variables needn’t be measured; the perturbations of leveling control are assumed to be described by structural uncertainties. The stiff problem is avoided since the design procedure is independent of the small parameter. The control problem can be effectively solved by the proposed iterative linear matrix inequality approach. The convergence of the algorithms is also studied. Furthermore, a numerical example and simulation results are given to illustrate the effectiveness of proposed method.
Nonlinear Heat Conduction in Materials with Temperature-Dependent Thermal Conductivity Using Hybrid Finite Element Model
Authors: Zhao Xin Juan , Zhao Ji Yi
Published: February 2012

The boundary-type hybrid finite element formulation is established to solve nonlinear heat conduction in solids with temperature-dependent material definition. The Kirchhoff transformation is first used to convert the nonlinear heat transfer system into a linear system, which is then solved by the presented hybrid finite element model, in which the fundamental solutions are used to approximate the element interior fields and conventional shape functions are used for the element boundary fields. The weak integral functional is developed to link these two fields and establish the stiffness equation. The accuracy and stability of the algorithm are tested on two examples involving various thermal conductivities to verify the present formulation.
Outline Extraction from Triangular Meshes Based on STL Files, VC++ and OpenGL
Authors: Xue Shuai , Li Qiang , Qian Bo
Published: February 2012

Outline extraction is the key technology of automatically generating roll trajectory in flexible roll forming process. The main purpose of this article is to extract outline from the grid lines of 3D surface in the STL (Stereo lithography) files. Using the functions of file stream and character manipulation provided by C++ Standard Library to read the STL file, using the GLUT(OpenGL Utility Toolkit) to build models, this article investigates the algorithms for outline extraction based on MFC Single Document Interface (SDI) Application.
Facade Furnishings- Preliminary Study on the Art and Culture of the Chinese Doorknocker Decoration
Authors: Qian Wei Qun , Zhu Zhong Cui
Published: February 2012

Most of Chinese folk houses have the “reserved” feature. As a partition of residences inside and outside, the door has a strong cultural flavor in decorative arts. The image of Chinese doorknocker in the door decoration highlights the imposing of “true”, “god”, “beauty” characters, and it becomes the carrier of traditional folk culture and “religious” culture. This door decoration implies an ancient and deep idea, and reflects the simple emotion of the public and it is the architectural heritage with the value of Chinese traditional culture.
Finite Element Design and Manufacturing Process of Flexible Roller
Authors: Lu Shan , Liu Jing Ping
Published: February 2012

In this paper, the design of rigid roller was optimized with finite element method, and processing technology of rigid roller was improved. A new type of flexible roller structure has been designed, and investigated its processing technology, which have important guiding significance in real productivity.
Study on the Utilization of Digital Elevation Model for Calculation Method of Reservoir Capacity
Authors: Lai Li Fang , Zhang Yu Fen
Published: February 2012

Reservoir capacity is a very important parameter for reservoir. This paper discusses the use of contour lines to establish digital elevation model (DEM) of reservoir, and to calculate reservoir capacity to improve the accuracy of the capacity calculation through the method that uses digital elevation model.
Research on Constant-Temperature Drying Test of Cotton Straw and Regression Analysis of Drying Rate
Authors: Hu Jian Jun , Shen Sheng Qiang , Lei Ting Zhou , Huang Hao , Zhang Quan Guo
Published: February 2012

Constant-temperature drying tests for cotton straw under different conditions were performed with an integrated thermal analyzer, and the influence of different drying conditions on the drying process was analyzed. The process was divided into preheating stage, constant-rate drying stage, and decelerating drying stage. Regression analysis was conducted for drying curves at the latter two stages, and then the drying time at the critical point was determined. Regression equations of drying rate at these stages were produced. Research results showed that the decelerating drying stage of cotton straw included two decelerating intervals, and the best ending point of the drying of the cotton straw that had an initial moisture content of 56.1% and a drying temperature of 100°Cwas 600s, thus providing experimental data and reference for research on drying technology of straws.
The Research of Scrap Tire Rubber Powder Effect on the Performance of Cracking Mortar
Authors: Hao Run Xia , Dong Su Fen , Guo Xiao Yan
Published: February 2012

Through the contrast test of the different proportion scrap tire rubber powder insulation mortar, the scrap tire rubber powder influence on cracking mortar performance such as the physical, mechanical performance and the shrinkage cracking. Experiment shows that waste rubber particles can improve mortar toughness; the mortar drying shrinkage and the crack of early plastic shrinkage are restrained effectively. But for keeping mortar workability and mortar compressive, flexural strength is the effect of unfavorable.
COE Based on Redundancy Material Defect
Authors: Wang Jun Ping , Ning Pan , Pang Ruo Yu , Fang Jian Ping
Published: February 2012

In the nanometer technology node, the contradiction between high investment and low yield has got more and more prominent, so it plays a very significant role in improving the yield to optimize layout. The COE, Critical area On Edge network, which is a kind of network based on the redundancy material defect with edges expressing critical areas, is constructed in this paper. Vertexes stand for nets of the layout, and edges do short circuit areas existing in nets. By studying the applications of COE in DFM, it is indicated that the COE provides a new way to the research of nanometer node in DFM.
Modeling of Compound Errors for CNC Machine Tools
Authors: Wang Wei , Zhang Yi , Yang Jian Guo
Published: February 2012

In this paper, a synthesis modeling method of geometric and thermal error is presented. Through the analysis of machine error data at varying temperatures, the error distribution rule is obtained. Based on the different characteristics of geometric error and thermal error, error separation method has been carried out in the modeling. Using polynomial fitting for geometric error and linear fitting for thermal error, a synthesis mathematical model has been proposed. This error compensation method concerns the variations of geometric errors at different temperatures in the machine working, thus a comprehensive analysis is made on the error and its regularity from the overall temperature rise to the heat steady-state. Both at low and high temperatures in the machine working, the experimental validations show that the positioning errors of the machine tool are reduced effectively after applying the error compensation approach.
The Analysis and Research about a Mask Design of AES
Authors: Wang Guo Shun , Zhang Yan
Published: February 2012

AES encryption system is briefly introduced, the function and principle of mask technology has been expressed. Because the vulnerability of the AES encryption system by the energy attacks, the measures need to add to increase the ability of energy analysis of AES. The mask design content is added in the AES encryption system. The mask design of AES encryption was given detailed. Four steps of the mask design process are also given. The conversions and implementation of AES mask design are presented, such as, the transformation of S box and so on. The implementation methods of how to eliminate the mask are given in the final round of AES encryption. It is finally discussed that threaten and influence of energy attack on AES.
Parameters Optimization about Precision Milling Titanium Alloy TC4 Used for Aviation
Authors: Wu Wei Hua , Guo Yan Yan , Zhao Can , Xu Tao , Yang Jia
Published: February 2012

To improve the production efficiency and product quality of titanium alloy TC4, with the minimum of cutting force F, surface roughness Ra, and surface peak valley height Pv as the optimized goal, using orthogonal rotating combination design method of three factors quadratic regression, the influence of cutting speed vc, feed per tooth fz and cutting width ae to cutting force (Fx, Fy) surface peak valley height Pv and surface roughness Ra are mainly studied, and the best cutting amount combination is chosen. Experiment results indicate that the best cutting parameters of titanium alloy are vc=28.588 m/min、fz=0.043 3 mm/z、ae=0.1 mm, the optimal values are =3.346 N、 =47.01 N、 =673.89 nm and =201.78 nm. This research is of theoretical significance for improving the processing efficiency and machining quality and reducing the production cost.
Numerical Simulation of Semi-Solid Die Casting of Housing Cap Earing
Authors: Huang Yong , Yao Guo Hai , Du Xiao Ming
Published: February 2012

The influence of the apparent viscosity and pouring temperatures of the semi-solid aluminum alloy on filling and solidification process of the housing cap bearing under the condition of die casting was analyzed using numerical simulation method. The results of simulation show that the mold filling velocity of the semi-solid aluminum alloy decreases markedly with increase of the apparent viscosity. The influence of the pouring temperatures of the semi-solid aluminum alloy on the mold filling velocity is consistent with that of the traditional die casting. The solidification temperatures at the same position of the casting increase with increase of the apparent viscosity of the semi-solid aluminum alloy. There is no casting defect in the casting after complete solidification.
Application of Radial Basis Function Neural Network to Support Concept Evaluation
Authors: Yang Qing Wei , Wang Nai Chao , Lin Ma
Published: February 2012

In order to solve the problem that how to evaluate the complex system support concept, an evaluation method based on Radial Basis Function (RBF) neural network model was presented. Through researching the support system overall design characteristics and elements of support, on this basis, evaluation parameters of support concept were abstracted. Support concept evaluation model based on RBF was established and a mature and stable RBF neural network was trained to calculate the comprehensive evaluation value for support concept. Finally, the further demonstration and verification of the method are given through specific case application and compared with the result for evaluation results of data envelopment analysis (DEA) model.
The Multi-Objective Optimization Design of Vehicle Suspension System Based on ADAMS
Authors: Gou Zhi Jian
Published: February 2012

In order to improve the riding and handling of the vehicle，the full-vehicle dynamical model of a certain vehicle is established by means of the software Adams/Car．The design of multi-objective optimization was used for Suspension system parameters on the base of the dynamical model．The optimized results show that riding of the vehicle is retained and dynamic load of wheel is improved obviously．It can be concluded that the optimization method is feasible for the optimization design of suspension system parameters．the investigation also supply the basis of theory for design considering the matching of the suspension system parameters.
Influence Factors Study on the Properties of Epoxy Resin Modified by Polyurethane
Authors: Ren Dong Yan , Li Xiao Hong , Li Zhi Hua
Published: February 2012

Polyurethane-modified epoxy resin was prepared with Polyurethane prepolymer(PUP). The effects of the PUP content and epoxy resin type on mechanical and thermal properties of materials were discussed. The results indicate that the tensile strength and impact strength of the material increase to maximum successively, and then decrease with the increasing addition of PUP. When the mass fraction of PUP was 15%, the tensile strength and the impact strength of materials were all the best. There were significant differences in mechanical and thermal properties of material for different epoxy, and the best results were cured epoxy TDE-85.
Double Closed-Loop Motor Modeling and Analysis for Lunar Rover Simulation
Authors: Huang Wei Dong , Feng Hong Kui , Bao Jin Song , Xu You Sheng
Published: February 2012

Motor drive control is the major study field in the development of lunar rover. Based on the double-closed DC loop adjustable-speed system, a motor drive simulation module using a position recursive PID control algorithm is developed, which is integrated into the multi-body dynamics simulation system, to carry out the whole lunar rover simulation. And the cruise process of lunar rover locomotion in the complex lunar terrain is simulated in a virtual environment.
Simulation on Steel Solidification and its Shrinkage in Mould of FTSC Slab
Authors: Zhu Li Guang , Chen Jian , Xu Ying , Zhang Cai Jun , Wang Shuo Ming
Published: February 2012

The solidification shrinkage of liquid steel has an important impact on thermal deformation behavior of high-temperature thin shell. Solidification shrinkage of liquid steel is an important basis for structure and shap optimization of the mould. In this paper, a direct coupled model was built on heat transfer in solidification and stress-strain by using the ANSYS software. And solidification shrinkage of liquid steel with the interior temperature and stress distribution were studied in the process of steel solidification, and it provided a theoretical basis for the further optimization of shape of the thin slab FTSC mould. This study was based on analysis of temperature and stress, deriving calculation of solidification shrinkage of steel’s phase change on macro-state by calculating the variation discipline of the distance between nodes.
Application Research on PDM in Heterogeneous Data Source of Ship Collaborative Design
Authors: Xu Lei , Su Shao Hui , Chen Guo Jin
Published: February 2012

In order to improve the work efficiency and the utilization of knowledge in ship collaborative design, researchers introduce the technique of PDM into it. However, there exits vast amounts of heterogeneous data in ship collaborative design, which affects the smooth progress of ship design, and it also creates obstacles to the designers those in different work fields. This thesis analyzes the processing method of heterogeneous data, solves the problems of how to exchange and transmit data in a heterogeneous environment. There puts forwards a model using XML to realize the combination of heterogeneous data in ship collaborative design at last.
Study On Simulation Of The Main Shaft Production Line
Authors: Chai Shu Feng , Luo Su Jun , Zhang Li Jie
Published: February 2012

Since modern production system is a highly complicated discrete manufacturing system, it is very difficult to design the production line by traditional means. However, through building model of production system in virtual environment, analyzing and evaluating production system performance based on system simulating technology, the production system’s parameter and configuration can be optimized ahead of production plan to optimize production process and improve production efficiency. In this paper, the main shaft production line simulation model is constructed based on the object oriented discrete system software eM-Plant. The production line throughput, utilization and bottleneck operations are analyzed. Based on this, it can support the configuration of production line optimized. The example verifies that the modeling and simulation technology could be successfully used in manufacturing industry.
The Use of Solid Edge in the Classifiers Design
Authors: Li Kun Shan
Published: February 2012

paper use solid edge design methods and Combine traditional separator design experience, based on modern design of efficient separator and use three-dimensional design.
Quantitative Analysis of Gas Flow in a Planar SOFC
Authors: Wang Kai , Zhang Yi Sheng , Li Jian
Published: February 2012

Computational Fluid Dynamics (CFD) method was adopted to establish the three dimensional model for cathode gas channel of planar SOFC and simulate the gas flow in the channel of a single cell. A quantitative analysis method was presented to research the status of gas flow. The characteristics and diagram of velocity change were obtained by using the quantitative analysis method. Furthermore, it was found that gas leak has a negative effect on the uniformity of gas flow, which is more obvious in the region near the leak side.
Numerical Simulation and Experimental Studies for High Gas Velocity Electrostatic Precipitator
Authors: Yi Cheng Wu , Zhao Yun Qing , Yi Rong Jie , Yin Tian
Published: February 2012

The high gas velocity electrostatic precipitator (HGVESP) is simulated by computational fluid dynamics (CFD) technology. The SIMPLE algorithm is used to calculate and the geometry model is divided by pre-processing software ICEM. The relationship of gas velocity, dust particle size and voltage is examined by FLUENT. The results suggest that with the improvement of applied voltage and dust particle size, collection efficiency increases. The results show that HGVESP with transverse plates can not only have a high efficiency, but also increase treatment capacity, which achieve miniaturization. Then the correctness of the model is verified by experiments.
Optimum Design of Drive Project in Lathe Speed-Change System
Authors: Liu Fen , Yan Jun Xia , Yuan Xiao Wen
Published: February 2012

Abstract： Based on the graphic theory and the design method of classification model, a new method of optimum design of drive project in lathe speed-change system is proposed. The mathematical model and optimum method are set up. This method can be used to design speed changing gear box of the lathe. This has a very important meaning in improving design precision and shorting design time.