bluuebunny/crossref_metadata_2025 huggingface dataset:
Properties of the Plasma Sprayed NiCrAlY+ (ZrO2+CaO) Graduated Coating on 1Cr18Ni9Ti Steel
Authors: Chen Fei , Zhou Hai , Chen Jia Qing , Lu Fan Xiu
Published: October 2010

The plasma sprayed gradated coating with the bottom layer of NiCrAlY and the top layer of (ZrO2+CaO) was prepared on the 1Cr18Ni9Ti steel surface by the plasma spraying technique. The phase structure and morphology of the gradated coating were analyzed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The high temperature oxidation resistance of the plasma sprayed samples at 800°C was investigated. The oxidation kinetics curve was worked out. The wear-resistance behavior of the graduated coating under dry sliding against GCr15 steel was evaluated on a ball-on-disc test rig. The results show that the thickness of gradated coating is about 320μm. The plasma sprayed gradated coating on stainless steel surface can improve the high temperature oxidation resistance of stainless steel. The oxidation rate of stainless steel is less than that of plasma sprayed gradated coating. The oxidation coating of plasma sprayed sample was very dense and is not easily exfoliated. The dense oxidation coating prevents the stainless steel from more oxidation. The friction coefficient of the 1Cr18Ni9Ti substrate was about 0.33 on dry sliding against the GCr15 steel, while the graduated coating experienced abated friction coefficient to 0.21 on the same testing condition.
Flywheel Energy Storage Used in Enhancing the Construction Machinery Engine Speed Stability
Authors: Gu Hai Rong , Jiao Sheng Jie , Xiao Chong Yu , Liu Yi Min , Wang Fu Chun
Published: October 2010

To study the flywheel storage energy in enhancing the construction machinery engine speed stability, Dynamic model on engine and engine connecting another flywheel is established. With a group of experiment data, load changing effecting the engine speed is compared when the storage energy flywheel is assembled and not. The results indicate that high frequency engine speed fluctuating is less when the storage energy flywheel is assembled, the drive and economy performance is better, and added energy loss is only for friction.
Studies on Ground Environmental Vibration Induced by Urban Rail Transit
Authors: Dong Lian Cheng , Li Guang Ying , Yang Yan Juan , Tao Xia Xin
Published: October 2010

In order to offer theoretical basis for the vibration prevention and noise reduction for the area along urban rail traffic line, the propagation laws of environmental vibration are summarized by analyzing observation data in time and frequency domain based on actual field observation data in Beijing. The mathematical statistics method under the criterion of least-squares has been used to study the vibration propagation and to establish the empirical formula of vertical ground vibration. The results obtained from the empirical formulas proposed agree with the results of field observation well. The vertical ground vibration level is much higher than that of horizontal. So the vertical ground vibration level is the most important aspect when evaluating ground environmental vibration level. The field response near the rail depends on the high frequency vibration caused by moving train and that far from the rail is dominated by the natural vibration frequency of train and the field vibration. The response amplitude of environmental vibration would be changed when load changed.
Dynamic Deformation of Railway Tunnel Bedding Structure
Authors: Huang Lin Chong , Zhou Cui Ying , Cheng Ye , Li Wei Ke
Published: October 2010

Four models of the tunnel bedding structure were analyzed under the impact loads of the train by simulating the infrastructure under the track. In this study, we examined the relationship between the vertical dynamic coefficient and the train velocity, and also analyzed the damage sustained by the bedding structure under the static and dynamic loads. It is suggested that the damage in the concrete bedding is detected in the longitudinal direction, immediately below the two rails, and that this damage is likely to occur not from attaining an elastic limit under static loads but more likely from damage accumulation in fatigue due to repeated loadings. It is not advisable to improve the tunnel bedding structure by simply increasing the thickness of the concrete bedding board; however, the bending resistance of the tunnel bedding structure can be enhanced by adopting compact reinforced concrete structure.
The Effects of Concrete Strength Grade on Concrete Impermeability and Gas-Proof
Authors: Zhao Yu , Peng Hai You , Ye Jian Xiong
Published: October 2010

In order to reveal the relation between concrete strength grade and concrete permeability, based on C20, C25, C30 and C40 concrete impermeability and gas-proof tests, the effects of concrete strength grade on concrete impermeability and gas-proof are investigated. The results show that the gas-proof and impermeability property of concrete increase when concrete strength grade are subjected to higher one.
Influence Factors on the Junction Line Entering for High-Temperature Alloys in Resistance Seam Welding
Authors: Chen Yi Ping , He Wen , Zhu Fu Qiang
Published: October 2010

The junction line entering is the common flaw that has often arisen in the resistance welding, especially within the resistance seam welding for the high-temperature alloys. It decreases the effective nugget diameter and reduces the tensile-shear strength of welding joint. Stress concentration can be easily created in the junction line entering under moving loading, which induces crack formation and thus seriously affects the welding quality. Owing to the plenty of factors effect on the junction line entering as well as big difficulties for experiment and the high failure rates，junction line entering has the great significance for the stability of welding quality to study its forming and protective measure. The junction line entering for the high-temperature alloy GH163 was studied through the seam welding as follows: surface conditions, welding variables, and agitation force. Some reasonable solutions for entering were provided.
A Study on the De-Noising of the Passive Sonar in Underwater Robot Based on the Gabor
Authors: Li Feng , Qu Xi Long , Zhang Yi Xing
Published: October 2010

This paper focuses on the research of the de-noising of the passive sonar based on the Gabor. Based on the modeling and simulating of the underwater robot about ship radiated noise, this paper analyzes and compares the effect of de-noising of the passive sonar of ship radiated noise. It is shown that better de-noising effect are achieved by using the Gabor method. This method have a significant foreground in de-noising of passive sonar.
Simulation of Suspension-Tire System Model Based on Rear Axle of Twist Beam
Authors: Wu Xu Dong , Zuo Shu Gang , Lei Lei , Yang Zian Wu , Li Yong
Published: October 2010

With the intention of researching suspension’s effect on the self-excited vibration of tire, according to the characters of polygonal wear, the twist beam suspension of car PassatB5 was simplified to proper mechanical model in the method of FEA. Then, making the coupling of lateral friction self-excited vibration of tire and draw-wrest operation of lengthways pendulum arm taking the previously built friction coefficient model into account which could cause the self-excited vibration of tire, besides the velocity of car’s driving, another exciting source could be found in this model.
A Lightweight Distributed Computing System Based on JavaScript Technology
Authors: Tang Jun
Published: October 2010

Because the web is not only the platform for information exchange but also the computational platform based on JavaScript engine, every computer having installed modern browser on the Internet can easily access the web and execute some JavaScript programs. Under above conditions, we develop a lightweight distributed computing system based on the web and JavaScript technologies. Our system plays an intermediary role between the IT expert who has to solve large-scale computational problem and end users on the Internet. In the other words, people could easily cooperate with each other to finish complicated computational problem through the support of our system.
Dry Sliding Behaviors of PDCPD Nanocomposite Prapared by RIM
Authors: Pan Bing Li , Zhang Chun Fei , Zhang Yu Qing
Published: October 2010

Reaction injection molding (RIM) is a rapid processing technique for the formation of polymer parts by direct polymerization in the mold. Polydicyclopentadiene (PDCPD)/Clay nanocomposites with various amounts of clay were synthesized with a Gusmer-Decker machine by RIM, and the specific injection conditions of the nanocomposites were obtained. The results of X-ray diffraction (XRD) diagrams of the nanocomposites showed that clay were completely exfoliated. The tribological behaviors of PDCPD nanocomposites were studied using an MM-200 friction and wear tester. The experimental results showed that the wear mass loss of nanocomposites reach the minimum while the MMT content of the nanocomposites is 1wt%. The values of friction coefficient almost keep constant within the range of MMT content as added.The worn surface of PDCPD nanocomposites was examined with a scanning electron microscope (SEM) and the friction and wear mechanism was discussed.
Design on Parameterized Drafting System of Centrifugal Fan
Authors: Zhu Jiang , Chen Limin , Xi Ping Yuan
Published: October 2010

The impeller is the important pneumatic part of centrifugal fan, and its structure performances are key factors which affect the whole performances of fan. The CAD module of centrifugal fan can realize the automation of aerodynamic force calculation. According to demands, computer can automatically complete aerodynamic force calculation and further determine major geometric parameters of impeller of fan. Speed coefficient and diametral quotient are two important parameters reflecting the character of ventilating fan. The relation curve between the speed coefficient and diametral quotient of various fans is plotted in this paper. The CAD module of impeller of centrifugal fan can realize such functions as aerodynamic design and parameterization drawing of impeller, and can accomplish rapid response from receiving design parameters to profiled impeller of fan, so that it can improve the quality of drawing.
Artificial Intelligence Optimization on Automobile Drive Axle Assembly
Authors: Xi Ping Yuan , Chen Limin
Published: October 2010

Drive axle assembly is one of the key components of automotive, and the design quality of drive axle assembly can affect the driving performance, fuel consumption and serve life of vehicle greatly, therefore it is very important to adopt optimization to design the final drive and planetary transmission of vehicle. To reduce size and weight of transmission, the objective function should be specified that the sum of volume of pitch cylinder of sun gear and planet gears in planetary transmission incline to minimum. The objective function with penalty terms is built by penalty strategy with addition type, so as to transform the constrained optimization into the unconstrained optimization.Then the simulated annealing algorithm based on penalty strategy is adopted to solver the optimization model.
Application of Time-Frequency Distribution and FRFT in Modal Parameter Identification
Authors: Fan Jiang Ling , Zhang Zhi Yi
Published: October 2010

A combination of fractional Fourier transform (FRFT) and time-frequency method is presented to identify ambient excited modes. In this method, Gabor expansion is applied to identify natural frequencies and damping ratios. The signal autocorrelation can enhance energy distribution of each channel signal, which can help to identify parameter. FRFT is a good tool to estimate excitation signal. A simulation example is presented to demonstrate the performance of this method. The results have shown that the proposed method gives a reasonable estimation of modal parameters and excitation signal from response signals.
Developing MCDM Approach Based on GRA and TOPSIS
Authors: Wang Qi Bing , Peng An Hua
Published: October 2010

Multiple criteria decision making(MCDM) is widely used in selection from a set of available alternatives with multiple criteria, approaches to which includes fuzzy comprehensive evaluation(FCE), grey relational analysis(GRA), and technique for order preference by similarity to ideal solution(TOPSIS), and so on. First analyzes the limitations of various methods: only considering the overall effect of attribute indicators in the method of FCE, only considering the shape similarity of data curve between comparative scheme and ideal solution in GRA and only considering position approximation in TOPSIS. Second proposes a new method of comprehensive evaluation which takes into account both shape similarity and position approximation. The validity of this method has been further proved by an example of suppliers selection.
Analysis and Experimental Investigation of Chatter Suppression in High-Speed Cylindrical Grinding
Authors: Shen Xiao Long , Zhang Lai Xi , Long Hua , Zhou Zhi Xiong
Published: October 2010

In this paper, the variable speed grinding experiments at high speed have been studied systematically, and the method of improving the surface quality of high-speed grinding has been discussed on the basis of analysis of the chatter and the stability of the high-speed grinder. Through the variable speed grinding experiments at high speed, the vibration characteristics were measured by the vibration energy, and the power spectrum were analyzed by the maximum entropy spectral estimation of the vibration signals in time series. The results confirm that the chatter of high-speed grinding can be suppressed by the variable speed grinding to a certain extent.
Transverse Stiffness and Guiding Characteristics Analysis of Compliant Linear Guided Mechanism
Authors: Zhou Qing Kun , Zhang Zhi Yong , Fan Da Peng , Hong Hua Jie
Published: October 2010

This paper presents a novel compliant linear guided mechanism (CLGM) to replace traditional spring and translation joint to transfer motion and force with its advanced guiding characteristics. In view of the incompatible relationship between axial stiffness and transverse stiffness of CLGM, eight kinds of CLGMs were developed by using building block approach based on fixed-guided flexure beam. The finite element analysis (FEA) models of eight CLGMs were built to complete numerical analysis on the force-displacement in axis and off-axis direction with same geometric sizes. The FEA results show that the structure configuration of Type 2-Type 8 can achieve a larger axial travel, Type 2 and Type4 have the advanced guiding characteristic with higher ratio of axial/transverse stiffness. Analysis indicates that the building block approach is an efficient method to complete the conceptual synthesis of compliant mechanism and FEA is effective on the structure optimization for the required compliance and stiffness in axial and transverse direction.
Performance Analysis on Electrical Aided Turbocharged System
Authors: Fang Yan Kai , Chen Limin
Published: October 2010

A turbocharger is fitted to a diesel in order to enhance the inlet charge pressure, hence increasing the fresh air in the cylinder, then more fuel can be injected into the cylinder and sequentially more engine power can put out. The electrical aided turbocharged system is a mechanism adding a high speed electronic motor into a turbocharger shaft. The electronic motor can work as a motor to drive the turbocharger shaft and as a generator to generate electricity energy to storage energy. According to certain constraint conditions, the controlling strategy of the hybrid turbocharged system is presented. The simulation results about key work points reveal that controlling the turbocharged engine following the strategy can enhance the engine performance.
Prediction of Fuel Consumption per 100km for Automobile Engine Based on Gaussian Processes Machine Learning
Authors: Xu Xing , Zhao Yun
Published: October 2010

Gaussian processes (GP) is a machine learning method which has become a power tool for solving highly nonlinear problems. Aiming to the fact that it is still difficult to reasonably determine the fuel consumption per 100km for automobile engine，the model based on GP machine learning was proposed for prediction the fuel consumption per 100km for automobile engine. According to few training samples，the nonlinear mapping relationship between the fuel consumption per 100km and its influencing factors was established by GP machine learning model. The model was applied to a real engineering. The results of study showed that GP machine learning model is feasible, effective and simple to implement for prediction the fuel consumption. It has the merits of self - adaptive parameters determination and excellent capacity for solving nonlinear small samples problems.
Research on Dynamic Tension Control Theory for Heavy Scraper Conveyor
Authors: Shi Jian Guo , Mao Jun , Wei Xiao Hua
Published: October 2010

To control the tension dynamic behaviors of heavy scraper conveyor self-adjusting system used for the chain initial tension of the scraper conveyor was considered. Hydraulic control system according to the principle was designed and the control theory of the system was established. the new fuzzy- PID controller used to the self-adjusting system was designed to limit the minimum tension point to some given scope. the example of simulation proved that the increase of power loss due to the higher tension and the chain escaping from sprocket wheel due to the lower tension can be avoided.
Grid-Based Platform for Mining Association Rules
Authors: Chang You Qu , Hou Guo Ping , Deng Huai Yong
Published: October 2010

distributed data mining is widely used in industrial and commercial applications to analyze large datasets maintained over geographically distributed sites. This paper discusses the disadvantages of existing distributed data mining systems, and puts forward a distributed data mining platform based grid computing. The experiments done on a data set showed that the proposed approach produces meaningful results and has reasonable efficiency and effectiveness providing a trade-off between runtime and rule interestingness.
Design Task Decomposition in the Servo Press
Authors: Yu Sui Ran , Lu Yun Wei
Published: October 2010

This research is to find a design method for the large scale and complex product system. Thus, we made an approach to possibly better solution with limited time, limited resources and limited costs. This paper aims to find a method to quantify the solving process of the first stage in the concurrent design – “task decomposition”, in order to make preparations necessary for the next two stages -“concurrent task process” and “convergent coordination”. According to product's functional unit, we first decentralized complex product system into sub-modules. Then determine the importance and coherence among these sub-modules by using analytic hierarchy (AHP). Combining the results of the two judgments, we further classify the sub-modules to form distributed sub-systems, so that different design teams can work more effectively and more efficiently during their respective period. Finally, we verify the usefulness and effectiveness of the distributed method with an example of design task decomposition in servo press.
Semi-Rigid Analysis of Extended End Plate Connections Based on Correlation and Sensitivity
Authors: Pan Jian Rong , Wang Zhan , Su Cheng , Wang Lei
Published: October 2010

In traditional semi-rigid analysis of extended end plate connections is assumed to be deterministic parameters, most of moment-rotation models of the joint is determined by curve-fitting and statistically regressed with the test data. Those parameters of the models have little physical meanings and the effect of correlations between parameters is neglected. This paper deals with a semi-rigid joint of extended end plate connections based on correlation and sensitivity analysis. A numerical study was carried out and the finite element analysis was validated compared with the experimental results.The relative moment-rotation model was concluded based on correlations in parameters and probabilistic sentivity analysis. The relationship between height and width of steel beam was partial correlation, the relationship between thickness of steel beam flange and thickness of steel beam web was partial correlation. Height and width of steel beam, the distance of upper bolts to axle wire of steel beam were important sensitive parameters for the extended end plate connections.
Tribological Properties of Polydicyclopentadiene Filled with Chemically Treated Expanded Graphite
Authors: Zhang Chun Fei , Pan Bing Li , Liu Jing Chao , Zhang Yu Qing , Zhang Yong Zhen
Published: October 2010

Expanded graphite treated with silane coupling agent (DB-171) was incorporated into PDCPD to explore its tribological features. Chemically treated expanded graphite (TEG)/PDCPD composites were prepared by a simulating reaction injection molding (SRIM) system. The friction and wear properties of TEG/PDCPD composites were investigated on a block-on-ring tribological tester under dry sliding condition. Experimental results show that the friction coefficients of PDCPD composites increase slightly, and the wear volume losses of the PDCPD composites reduce significantly with the loading of treated expanded graphite. The addition of only 0.3wt% chemically treated expanded graphite contributes to dramatic improvement of wear resistance of PDCPD, and the wear volume loss reduces by 71.2% compared with pure PDCPD. Scanning electron microscopy (SEM) was utilized to study the worn surfaces of PDCPD composites, and the friction and wear mechanisms were discussed.
Application with Theory of Vibration Equivalence on Reliability Test Bed of Train Brake System
Authors: Wang Xiao Yan , Wu Meng Ling , Chen Zhong Kai
Published: October 2010

In order to design a reliability test bed for train brake system, theory of vibration equivalence was used to represent in laboratory the environmental vibration. Firstly, the root mean square (RMS) value of the acceleration was calculated for train brake system according to IEC 61373. Then, a configuration of vibrostand was proposed for the reliability test bed, which was mainly composed of vibrating table-board, vibrator motor, damp and four vibrating springs, as shown in figure 2. After that, an equation was got according to the RMS equivalency theory. Finally, the equation was solved according to the feature of the vibrostand. And the quantitative relation was got for exciting force F0, shock excitation circular frequency ω and spring rate k. The method can also be used on other occasions where sinusoidal vibration is needed to replace random vibration.
Numerical Simulation of Relationship between Equivalent Elastic Modulus of Porous Titanium Alloy / HA Coating Composite and Fraction Dimension
Authors: Gao Yong Yi , Gong Lan Yun , Zhang Hou An
Published: October 2010

The relationships among equivalent elastic modulus of porous titanium alloy / HA coating composite were investigated by using finite element method in this paper. The method of porosity and pore shape of bio-derived bone scaffold materials was ascertained by the elastic modulus of natural bone. The equivalent elastic modulus of porous titanium alloy / HA coating composite decreased with increasing porosity, decreased with the increase of fractal dimension of porosity space, and increased with the increase of fractal dimension of solid matrix. If the porosity ranged from 40% to 50% and pore/solid fractal dimension ranged from 2.77 to 2.96, the equivalent elastic modulus of porous titanium alloy / HA coating composite was consistent with the elastic modulus of natural bone when the bio-derived bone scaffold materials were fabricated by porous titanium alloy / HA composite coating materials.
Modeling and Dynamic Analysis for Rigid-Flexible Coupling Nonlinear Floating Raft Vibration Isolation System
Authors: Zhang Xing , He Qi Wei , Yu Xiang
Published: October 2010

To analyze the influence of the nonlinearity of the floating raft vibration isolation system, the theory of flexible multibody dynamics was used here to model the rigid-flexible coupling nonlinear floating raft vibration isolation system. The dynamical characteristics of the model were studied with ADAMS software and some typical nonlinear phenomena, such as subharmonics, superharmonics and attractor coexistence, were observed through time domain analysis.
Parameter Design of Heave Compensation System of Deep-Sea Mining Based on Dynamic Vibration Absorber and its Experimental Study
Authors: Li Liu Jun , Liu Shao Jun , Zuo Jin Yu
Published: October 2010

To ensure the safety and the production efficiency as well as the component lifetime of deep-sea mining system, a novel heave compensation system of deep-sea mining based on dynamic vibration absorber was proposed in the light of 5000m deep sea poly-metallic mining system of China in this paper. According to the work condition of heave compensation system, the response of deep-sea mining ship under random wave of sea state 4 in China’s deep sea poly-metallic mining field are numerically simulated in time domain. The proposed heave compensation system was simplified to a two-degree-of-freedom system stimulated by the displacement motion of the deep-sea mining ship and its dynamic model was built. Taking the minimum of the displacement variance of the proposed heave compensation system as the optimal object and considering the allowed displacement of the dynamic vibration absorber itself, the computation formula of the optimum parameters of dynamic vibration absorber for heave compensation system of deep-sea mining is derived. Thus the parameter of dynamic vibration absorber was determined and its effect on the performance index of the heave compensation system was simulated and compared. The dynamic vibration absorber with optimum parameters was simulated and tested on the test bench of double-storey mass-spring vibration system in the lab. The results of the example show that the performance of vibration control of the designed dynamic vibration absorber is satisfactory and the computational formulas given in the paper are effective. The results also verified that the heave compensator based on dynamic vibration absorber with the optimal parameters can have good performance of heave compensation and it is practical to isolate the lifting pipeline and its deployment platform from the vibration of the ship motion induced by the irregular wave with simplicity and less energy consumption. This work in the paper will be of great theoretical guidance in the optimum design of the dynamic vibration absorber for heave compensation system of deep-sea mining.
A Study on the Modelling and Simulation of Part Motion in Vibratory Feeding
Authors: Han L. , Gao J.X.
Published: October 2010

It is known that vibratory feeders are the most versatile of all hopper feeding devices for small engineering parts and play a key role in assembly automation. This work develops a mathematical model of the part motion in vibratory feeding, from which how the part works can be better known. A computer simulation programmed with MATLAB has been made to predict the conveying velocity of the parts in vibration feeding system, and furthermore, experiments have been carried out for verification purpose. The experimental results show that the simulation results are reasonable, and hence can be used to improve the design of vibratory feeding system.
The Globally Asymptotic Stability of Reaction-Diffusion Cellular Neural Networks with Time Delays
Authors: Luo Yi Ping , Cao Yi Jia
Published: October 2010

A new method is presented to investigate the globally asymptotic stability of reaction-diffusion cellular neural network with time-delays. The method is built on the mean Lyapunov function. We give some new sufficient conditions on time-dependent or time-independent to ensure globally asymptotic stability of the equilibrium point of the class of systems under the conditions of the active functions are continuous by employing linear matrix inequality (LMI). The results extend and improve the earlier works of other researchers. In additions, examples are given to show the application of the established stability theorems.
Expectation Value Calculation of Grid QoS Parameters Based on Algorithm Prim
Authors: Liang Kai Jian , Bai Lin Feng , Qu Xi Long
Published: October 2010

From the perspective of selecting service by QoS attributes, a computation method of QoS expectation value, which is based on Algorithm Prim, was presented to provide support for selection of service. On the basis of the ability of service providers, by Algorithm Prim, this method succeded in calculating a set of balanced expectation values of QoS. Selection of service based on these QoS values would be beneficial to optimization of system resources and protection of the users of those services. An example with analysis has been provided to demonstrate the feasibility and effectiveness of the method.
Finite Element Analysis of C Axis of High-Power Direct-Drive Bi-Rotary Milling Head
Authors: Yan Ming , Zheng Peng , Li Yan , Gao Xiu Feng
Published: October 2010

In a direct-drive high-power A / C-axis bi-rotary milling head, torque is transferred by two parallel connected rotary direct drive motors in C-axis, therefore, the length of C axis is inevitable large, moreover, the transmission components of it are bearing high torque. The torsion deformation of C axis must compute accurately during the design process. The torsion deformation of the transmission components of C parts when C-axis is rotating is analyzed by finite element method, the racial deformation and the torsion deformation of the case when C-axis is locking are analyzed either, this computing can provide support for the design and improvement of this type of milling head.
Synergistic Corrosion Resistance of Cerium Film and Silane Film on Hot-Dip Galvanized Steel
Authors: Wu Hai Jiang , Yang Fei Ying
Published: October 2010

This work aims at developing a new environmental-friendly treatment for hot-dip galvanized (HDG) steel as alternative to the classic systems based on chromates. A double layer film on the HDG steel sheets was prepared by immersing the sheets in 5 g/L Ce(NO3)3 aqueous solution and 5 vol.% silane solution in turn. The morphology of the cerium conversion film was analyzed using scanning electron microscopy (SEM). The corrosion resistance of the films was investigated by linear polarization (LPR) and natural salt spray (NSS) tests. The results show that the surface morphology of cerium conversion film appears on a “dry-mud” structure, which is favorable to enhance the combined strength between the cerium conversion and the silane film. The corrosion protection efficiency of the double layer films increases greatly, especially both the anodic and cathodic processes of zinc corrosion on the samples are suppressed conspicuously, and the synergistic protection effect of the single cerium film and the single silane film is evident.
Finite Element Analysis on Structural Stress of 8×8 InSb Infrared Focal Plane Array
Authors: Meng Qing Duan , Zhang Xiao Ling , Zhang Xiao Lei , Sun Wei Guo
Published: October 2010

Based on viscoplastic Anand’s model, the structural stress of 8×8 InSb infrared focal plane array (IRFPA) detector is systemically analyzed by finite element method, and the impacts of design parameters including indium bump diameters, heights and InSb chip thicknesses on both von Mises stress and its distribution are discussed in this manuscript. Simulation results show that as the diameters of indium bump decreases from 36 μm to 24 μm in step of 2 μm, the maximum stress existing in InSb chip reduces first, increases then linearly with reduced indium bump diameters, and reaches minimum with indium bump diameter 30 μm, the stress distribution at the contacts areas is uniform and concentrated. Furthermore, the varied tendency has nothing to do with indium bump standoff height. With indium bump diameter 30 μm, as the thickness of InSb chip reduces from 21 μm to 9 μm in step of 3 μm, the varying tendency of the maximum stress value in InSb chip is just like the letter U, as the indium bump thickness decreases also from 21 μm to 6 μm in step of 3 μm, the maximum stress in 8×8 InSb IRPFA decreases from 260 MPa to 102 MPa, which is the smallest von Mises stress value obtained with the indium diameter 30 μm, thickness 9 μm and InSb thickness 12 μm.
Finite Element Analysis on Structural Stress of 64×64 InSb Infrared Focal Plane Array
Authors: Meng Qing Duan , Zhang Xiao Ling , Zhang Xiao Lei , Sun Wei Guo
Published: October 2010

Two-step method is used to research stress and its distribution in 64×64 InSb infrared focal plane array (IRFPA) employing finite element method. First, a small 8×8 InSb IRFPA is systemically studied by varying indium bump diameters, standoff heights and InSb chip thicknesses in suitable range, with indium diameter 30μm, thickness 9μm and InSb thickness 12μm, von Mises stress in InSb chip is the smallest and its distribution is uniform at contacting areas. Then, the sizes of InSb IRFPA is doubled once again from 8×8 to 64×64 to learn the effect from chip sizes, thus, the stress and its distribution of 64×64 InSb IRFPA is obtained in a short time. Simulation results show that von Mises stress maximum in InSb chip almost increases linearly with array scale, yet von Mises stress maximum in Si ROIC decreases slightly with increased array sizes, and the largest von Mises stress is located in InSb chips. Besides, stress distribution on the bottom surface of InSb chip is radiating, and decreases from core to four corners, and stress value at contacting area is smaller than those on its surrounding areas, contrary to stress distribution on top surface of InSb chip.
Real-Time Soft Shadow Generating in Three-Dimensional Scene
Authors: Xiao Lei , Liu Cheng , Qu Xi Long
Published: October 2010

For the sake of improving the third dimension of 3D scenes, we analyze the existent real-time shadow generating algorithms, and improve the Chan’s smoothie soft shadow algorithm, make it based on shadow map, and treat with both the inner and outer penumbra. It not only effectively resolves the problems such as some algorithms can not cast shadow on itself and some are too complex, it also solves the aliasing problems of shadow mapping, and it meet the requirements of real-time in more complex scene. At last, the algorithm is emulated with DirectX, and the experimental results show the feasibility of the algorithm.
For the Shipbuilding Enterprise Model of Intelligent Recommendation Services
Authors: Zhang Wei , Pan Xiao Hong , Fang Xin Kang
Published: October 2010

Based on ships transaction in useful information personalization gain question, proposed that one kind the intelligent recommendation service model which unifies the ASP (Application Service Providers) pattern and the recommendation technology. In this model, the service uses five structures, the intelligence management transfer application service level and the resources component level, cooperates to realize the intelligence mutually. In view of the ships profession electronic commerce pattern's characteristic, the depth limited auto-adapted k close neighbor searching algorithm which uses transforms the user grading non-isotropic space as the isotropic space, obtains the isotropic grading matrix, thus searches the current user k recent neighbor, has current user's forecast grading, and has the recommendation. Has provided the simple direct-viewing practical commercial service for the ships manufacturing firm.
Study on Aging Characteristics of Warm Mix Asphalt: Using Softening Point as a Parameter of the Aging Kinetics Model
Authors: Zhang Jiu Peng , Pei Jian Zhong , Xu Shi Cui , Bi Yu Feng
Published: October 2010

In order to indicate the aging process and evaluate the aging resistance of warm mix asphalt, thin film oven tests of original asphalts and warm mix asphalts were conducted, and the softening points of different asphalts in aging process were compared. Then, using softening point as a parameter, the aging kinetics model was established and the kinetics parameters were also calculated to reflect the aging performance of different asphalts. It is indicated that warm mix asphalt has larger activation energies and lower reaction rate constant than those of original asphalt, and the aging performance of warm mix asphalt after are better. The aging behavior of warm mix asphalt could be well evaluated by the aging kinetics model.
Analysis of the Gearing Theoretic between Plastic Helical Gear and Steel Worm
Authors: Hao Yi Shu , Yue Bin Nan , Zhu Xin Xing
Published: October 2010

The gearing transmission equation was deduced by the principle of the engagement characteristics between plastic helical gear and steel worm. This paper makes an analysis on the law which is the deformation process of tooth profile and potential contact in different kinds of load by means of Hertz contact theory. The paper also uses MSC.Nastran to simulate the stress-strain status, the deformation process and arrives at the law of gearing changing, which was verified the correctness of the analysis above.
Experimental Study on Slab Track Passenger Transportation Special Line Roadbed Power Response
Authors: Ma Ming Yue , Wu Ke , Gu Cheng Hao
Published: October 2010

In order to assure the security of Wuhan–Guangzhou railway passenger dedicated line, the experiment study of dynamic response was developed in the construction finished roadbed. The longitudinal wave velocity and the transversal wave velocity of stress wave in the roadbed were obtained. The weaken rule of stress wave in roadbed was analyzed during its dissemination and the dominant frequency was gained in the vibration structure. The dynamic modulus of elasticity and the poisson's ratio of roadbed material were defined. Furthermore, the experiment simulated the process of train instant load during transmitting in the roadbed. The influence of roadbed material, structural property to locomotive safe, steady movement was researched. These conclusions provide uses for reference importantly to guarantee the quality of slab track on railway passenger special line under construction.
Weld Performance of Joint of Beam to CFST Column with Interior Strengthening Ring
Authors: Pan Jian Rong , Wang Zhan , Sun Xue Shui
Published: October 2010

To replace full penetration weld with twin fillet weld for the design and construction of joint of beam to CFST (concrete-filled steel tube) column with interior strengthening ring, six specimens were tested by incremental loading and cyclic loading. The finite element package ANSYS was used to study the nonlinear behavior of such specimens. The finite element model was validated by comparing the computed values with experimental results. The failure mode was local buckling in the flange edge between beam flange and steel tube because of local stress concentration. When the joint was damaged, the stress of weld (including full penetration, partial penetration, and twin fillet weld) between steel tube and interior strengthening ring is smaller than yield strength. The twin fillet weld was proposed for design and construction of the joint instead of full penetration weld.
Simulation Research of Saw Angle Adjustment System for Sliding Table Saw Based on MATLAB
Authors: Cheng Peng Le , Tan Yue Sheng , Xu Ya Dong
Published: October 2010

Mathematical models of saw angle adjustment system were presented. The errors of each constraint function were calculated using the software MATLAB. Considering error, computational complexity and production efficiency of the machine, a linear function was selected. According to experiments, 0° and 35° angles of saw were selected as the trial cut angle. The results show that its error is smaller than least square fitting and it can assure machining accuracy when there are assembling errors.
Stochastic Finite Element of Structural Vibration Based on Sensitivity Analysis
Authors: Mo Wen Hui
Published: October 2010

In this paper, material properties, geometry parameters and applied loads are assumed to be stochastic, sensitivity computation of structural vibration is presented. The vibration equation of a system is transformed to a static problem by using the Newmark method. In order to develop computational efficiency and allow for efficient storage, the Preconditioned Conjugate Gradient method (PCG) is also employed. The PCG is an effective method for solving a large system of linear equations and belongs to methods of iteration with rapid convergence and high precision. An example is given respectively and calculated results are compared to validate the proposed methods.
Study on Two Kinds of Pneumatic Booster Valves
Authors: Shi Yan , Cai Mao Lin , Liao Ping Ping
Published: October 2010

In order to improve characteristics of booster valve, one kind of pneumatic boost valve was proposed, which makes use of the expansion power, firstly, aiming to the process of pneumatic boosting valves, non-linear differential equations of pneumatic booster valves were set up, using the software MATLAB/simulink for modeling simulation, and variations of flow and pressure of air in boosting chambers and driving chambers were obtained. Secondly, According to the principle of simulation, input pressure-reduced pneumatic booster valve was studied experimentally; curves of exhaust flow and pressure of air in tank were got. As a conclusion, it is clear that simulation and experimental results have a good consistency; flow of air exported by expansion energy-used pneumatic booster valve is larger than that by input pressure-reduced pneumatic booster valve, and the maximum flow is 2.5 times of the flow of air exported by input pressure-reduced booster valve. Because of its compact structure, small size, no external power supply etc., pneumatic booster valve was widely used in locally pressure-boosting occasions of pneumatic system [1-2]. Most of the booster valves were called input pressure-reduced pneumatic booster valve (short for input pressure-reduced booster valve), output pressure of which was set by adjusting input pressure of the driving-champ, such as VBA series of booster valve of SMC Corporation [3]. With the development of energy-saving technologies of pneumatic system, importance of booster valve has become more and more obvious [4]. However this type of booster valve has its own shortages, for example its life is too short and output flow is too small, when boosting-rate is higher, these shortages become more distinct [5-7]. In this paper, firstly, one new type of booster valve (called expansion energy-used pneumatic booster valve, short for quantitative booster valve) was proposed. On the basis of analysis of working principle and structure of both booster valves, mathematic models of the quantitative booster valves were set up, using the software MATLAB/simulink for modeling simulation to research the working processes. Last, According to the principle of simulation, input pressure-reduced booster valve was studied experimentally.
The Effects of the ACL Reconstruction Tunnel(s) on Patellofemoral Contact
Authors: Huang Rong Ying , Xu Qiang , Xu Yong Gang
Published: October 2010

No quantitative data were reported in the literature regarding the effects of the ACL reconstruction tunnel(s) on patellofemoral contact .In this study the patellofemoral joint was built from MRI data of a normal knee. Based on this, the patellofemoral contact models in which there were ACL reconstruction tunnel(s) were also built. Then different contact statues of patellofemoral joint were simulated by orthogonal test and finite element method to analyze the effects of the ACL reconstruction tunnel(s) on patellofemoral contact. Results show that: 1. Stress on the cartilages is not sensitive to the parameters of position and orientation relatively, but the single-bundle and double-bundle reconstruction tunnel(s) significantly change the extent of the sensitivity to the motion parameters, especially the stress on the femoral cartilage. 2. The stress on the surface of cartilages also will be obviously changed by single-bundle/double-bundle tunnel(s) and they will significantly increase under some contact status, but for the contact pressure, it is inconspicuous. 3. For single-bundle tunnel, contact areas between cartilages change little while only about one-fifth of the total contact locations have changed by 20%. Besides, the effects of double-bundle are smaller than single-bundle tunnel. This study not only provides technical data to improve the reconstruction quality, but also supplys a method for the assessment of ACL reconstruction.
Adaptive Multiple Impedance Control Based on Passivity
Authors: Li Wen Jun , An Bai Ling , Zhang Hong Kun
Published: October 2010

Adaptive multiple impedance control based on passivity is studied about two robot manipulators cooperating an object which interacts with external environment actively. The dynamic model is derived by Newton-Euler equation and the relations between the forces are analyzed. The relations between stiffness coefficient and convergence are explained by solving the differential equation when the stiffness coefficient is known. The adaptive impedance controller based on passivity is designed combining adaptive control and generalized impedance control when the stiffness coefficient is unknown. The impedance control based on internal force is adopted for the cooperative system. The simulation results prove the validity of the method.
Solution for a New Sub-Problem in Screw Theory and its’ Application in the Inverse Kinematics of a Manipulator
Authors: Tan Yue Sheng , Cheng Peng Le , Xiao Ai Ping
Published: October 2010

Three basic sub-problems of screw theory are acceptable for some particular configuration manipulators’ inverse kinematics, which can not solve the inverse kinematics of all configuration manipulators. A new sub-problem is presented and the inverse kinematics thereof is solved in this paper. Based on the extended sub-problem, a manipulator, the inverse kinematics of which can not be solved by the three sub-problems without the participation of the new sub-problem, is constructed. The inverse kinematics of the manipulator is solved with the help of the extended sub-problem。Therefore a close solution is gained. The sub-problem herein can be applied directly in the inverse kinematics of a manipulator, providing a new approach for the inverse kinematics of a general configuration manipulator.
The Complex Dynamical Behaviors of Lateral Vibration of Tire
Authors: Li Y. , Zuo S.G. , Lei L. , Yang X.W. , Wu X.D.
Published: October 2010

Considering the nonlinear characteristic of suspension stiffness and the effect of road input, a dynamic model of tread’s lateral vibration is established based on lateral-vertical force coupling, and the complex dynamic behavior of the system is analyzed. The results show that: the lateral self-excited vibration of tread is a kind of complex quasi-periodic motion caused by Hopf bifurcation of system, which oscillating range increases at first, then decreases with vehicle speed; the quasi-periodic motion occurs only at specific speed range, while not happen when speed is too low or high.
Investigation on Machining Characteristics for Tangential Ultrasonic Vibration Assisted Grinding
Authors: Lang Wei Feng , Zhang Hong Li
Published: October 2010

A critical speed formula was given based on the analysis of kinematic characteristics during tangential ultrasonic vibration assisted grinding (TUAG) process. By the formula, the machining parameters can be correctly set to insure the separate characteristics of TUAG process. The grinding force can be decreased and the machining surface quality can be improved during TUAG process with separability. Grinding experiments were conducted, and the experiment results are in good agreement with theory analysis results.