bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Ontology Based FPBS Design Model
Authors: Liu Kang , Li Yan , Zhao Wu , Li Wen Qiang
Published: March 2013

The conceptual design model for mechanical product and its computer aided design are the important and focus problems. A mechanical product design process of FPBS model, function-principle-behavior-structure model, was put forward and discussed. The semantic relationships between the elements of FPBS model were studied to make foundation for the application of FPBS model. The operational demand of knowledge system for FPBS model was analyzed, and indicates the ontology can be applied effectively to knowledge system operation of FPBS model. Then, an ontology based FPBS model was established and a FPBS ontology model system was constructed. The experimental results indicate the model can be used in computer aided conceptual design for mechanical product effectively.
Research on Minimum-Cost-Based Task Decomposition Model of Multiple Expert Systems for Oil-Gas Reservoir Protection Based on Agent
Authors: Yang Li , Cao Xie Dong , Li Jie
Published: March 2013

To solve collaboration problem in multi-expert system, intelligent agent technology is used in multi-expert system.Firstly,by introducing a minimum-cost-based formal description of task decomposition,a new agent task decompositon model is presented.Secondly, heuristic algorithm for task decomposition is analyzed to solve communication among agents.For illustration, expert systems for oil-gas reservoir protection is utilized to verify the effectiveness of the method.The application of the expert system shows that based-minimum-cost task decompostion model is valid in agent task decomposition and heuristic algorithm for task decomposition can be used as communication among agents.As a result，the proposed cooperation mechanism based on agents can effectively solve the collaboration of experts in the multiple expert systems and improve the accuracy of inference.
1D and 2D Coupled Numerical Model for Flood Control in Middle Reach of Huaihe River
Authors: Ma Zhen Kun , Fan Zi Wu , Zhang Ming , Su Yi Lu , Sun Zhi Ling
Published: March 2013

The core technique of flood forecast and pre-warning of a river basin is the numerical simulation of flood process in a complicated flood control system. According to the structural features, flood features, and flood process mechanism of a large and complicated flood control system, a 1D and 2D coupled numerical simulation model was established. The 1D model was used for the trunk river and main branches, and the 2D model was used for flood districts. The coupled 1D and 2D was used to simulate the flood regulation and process in rivers, lakes, flood districts, and floodways. A case study was conducted in the section from the Wangjiaba to Bengbu floodgates in the middle reach of the Huaihe River. The coupled model was employed to synchronously simulate the branch rivers and trunk flood of the river basin and to improve the accuracy of flood simulation, flood forecast, and regulation of the river basin. The parameters of the model for simulating the flood process of the Huaihe River Basin in 2003 were calculated and verified, and the flood process in 2007 was demonstrated. The simulated results show that the flood regulation and process can be accurately simulated by the proposed numerical model, and the accuracy requirements can be satisfied. Finally, the model was applied to the effect analysis of a four-grade emergency flood control plan in the Huaihe River Basin.
Equivalent Load Identification Algorithm Based on Least-squares in Frequency Domain
Authors: Wang Cheng , Gou Jin
Published: March 2013

Because the real load location of structure in working condition is unknown or cannot be reached, a new equivalent load identification algorithm in frequency domain is proposed. This new algorithm can guarantee the same vibration response signals for key examination points and can reach purposes of reliability test and environmental adaptability test then. Based on the assumptions of linear system and uncorrelated of each load, combined transfer functions, least-squares of generalized matrix inverse in frequency domain, this new algorithm identify multi-sources loads at the same time. In this new algorithm, the Identification load location, direction and form can be specify prior and not be the same with real load location, the boundary condition of structure in test cannot be the same with working condition. Formula derivation, application scope and steps of this method were summarized then. Load identification results of vibration simulations in cylindrical shell showed that this new method could basically meet the engineering precision requirement of ± 3db at last, which valid the effectiveness and reasonableness of this method.
Reflection of the Teaching Reform of Environmental Art Design
Authors: Zhou Ming
Published: March 2013

Art design creative talent training can’t be separated from the teaching reform in colleges and universities, and the mission of art design creative talent training will be accomplished by the system of creative curriculum of the speciality eventually. The article reflects of environmental art design teaching reform currently provided from both creative thinking training and national design concept, renews the ideas, changes the thinking, reforms teaching system, adjusts the aims and service directions and explores the talent training mode to meet the social needs.
The Study of Supply Chain’s Symbiotic Relationship Based on CPFR - In Case of Food Industry
Authors: Zhang Jing , Chen Wei Long
Published: March 2013

The operation objectives of supply chain’s symbiotic relationship has both economic and social benefits(Especially in the food industry). The "duality" determines that the supply chain management has positive externalities effect, not only to obtain maximum economic benefits. Based on CPFR theory and symbiosis theory, supply chain management mode provides a new model to solve such problem. First, this paper briefly summarized the CPFR theory and elaborated symbiotic relationship based on CPFR theory.Then, this paper made an empirical analysis through a typical case of food enterprise.Finally, this paper put forward some related notice points about the supply chain’s symbiotic relationship based on CPFR theory.
Fuzzy AHP Applying in the Material Management of Construction Project
Authors: Wang Fei , Su You Wen , Li Chao Fei
Published: March 2013

Strengthing the material management and controlling materials consumption as one of the most important means to control engineering cost, play a decisive impact on the profit and loss of construction enterprises. Factors affect materials management are complex, so that combined with conventional methods can not effectively improve the efficiency of material management. Introducing the Fuzzy Analytic Hierarchy Process (AHP) in construction project material management for this issue to calculate and analysis the specific gravity of the content that in construction project material management,and find out the main management contents, so as to improve the efficiency of material management.
Tourism in China: A Study of its Impact on Economy, Culture and Society
Authors: Su Xiao Yan
Published: March 2013

With rapid development of tourism industry in China, more and more literature study on tourist impacts attracts scholars’ research interests, especially tourist impacts on destinations. Tourism impacts mainly include four aspects, which are economy, culture, society, and environment. In China, it refers mainly to the former three fields. This article describes the positive and negative impacts of these three fields in China.
Relief Effort and Reconstruction after Wenchuan Ms8.0 Earthquake
Authors: Wang Gui Zhen , Li Ying Min , Liu Li Ping
Published: March 2013

Wenchuan earthquake of May 12, 2008 in Sichuan province is most destructive, the most widely spread, the most difficultly to disaster relief in recent decades in China. The earthquake relief and reconstruction work is also the fastest, to mobilize the widest range of input power in an action, creating a miracle of the world's earthquake relief and reconstruction. Those successful practices provided a valuable experience reference to other areas for fight against natural disasters and rebuild their homes. This article describes the damage of housing, roads, bridges and other engineering structures and landslides mudslides, dammed lakes and other geological hazards triggered by earthquakes; Outlines the effort of the rescue operation, including personnel search and rescue, road rehabilitation, caring for the wounded, people placement and soon; Summarizes the reconstruction strategies and policies, including with Chinese characteristics” counterpart support” reconstruction mode which means a province to help a county. In the end, the article discusses the earthquake relief and reconstruction experience and inspiration.
Ecological Design Strategies of Vernacular Architecture in Shanxi, China
Authors: Wang Ting , Liu Yuan Ping
Published: March 2013

Shijiagou Village in Fenxi County, Shanxi Province is the typical example of traditional villages in mountainous region of Loess Plateau. It is of great historical,scientific and artist value.Based on vast investigation, this essay will deeply analyse and explain the construction site, the overall arrangement, the construction material and the ecological construction techniques of Shijiagou Village from four aspects.
Experiment and Analysis on Rheology Dynamic Characteristics of Soft Soil
Authors: Hu Hua , Zheng Xiao Xu
Published: March 2013

The rheologic action of the soft soil could be accelerated by earthquake the dynamic loading, which induces more geotechnical engineering accidents and geologic disasters. The samples of marine deposit soft soil are collected in xiamen, and the rheologic rate, rheologic acceleration and rheologic strain under the dynamic loading of sinusoidal variation are tested and analyzed by using dynamic-triaxial device, and the influences of dynamic loading frequency and breadth to dynamic characteristics of soft soil are contrasted and analyzed. The research results have important academic signification for us to search rheologic dynamic characteristic of soft soil under dynamic loading.
Experimental Study on Gravel Soils of Matrix Suction
Authors: Tang Hong Mei , Liao Pei Wei , Wang Lin Feng , Chen Hong Kai
Published: March 2013

Soil-water characteristic curve（SWCC）is closely relevant to two main factors which are structure and moisture content. According to the two factors the values of matrix suction of 45 groups experimental specimens within different moisture content and soil -stone ratio of unsaturated soil are get through filter paper method. Date analysis shows that relation between matrix suction and soil-stone ratio at different moisture states is of different characteristics. Relation between matrix suction and water content is notably nonlinear. Distribution of matrix suction is curved surface in the moisture and soil-stone ration state space which is the function of water content and soil-stone ratio, in which the axial plan is parallel to the axis of soil-stone ratio.At low water content,the matrix suction on the moisture content change is very sensitive, at high moisture content and closed to saturation stage matrix suction hardly changes along with water content and soil-stone ratio change. The curved surface which Located in the middle section ,the matrix suction on the change of water content are more sensitive, reduced with water content increasing; and in this phase the matrix suction is insensitive to the variation of soil-stone ratio. Finally, it is concluded that the saturation to describe the soil water characteristic curve is a bad choice, with moisture to depict the so. In contrast, directly using the water content to describe the soil water characteristic curve is better.
The Geochemistry Research on Eocene Volcanic Rocks in Sanshui Basin
Authors: Wei Zhang , Fang Nian Qiao
Published: March 2013

Guangdong Sanshui Basin evoluted with extreme volcanic activities. Eruptions between Paleocene to Eocene were concentrated on Xinzhuang, Buxin, Baoyue and Huayong formations. For realized the relationship between various kind of rocks, Geochemistry analysis such as multi-element and rare-earth element determination were launched on Basalt, Trachyte and Rhyolite samples from the research area. Geochemistry diagram suggest that: REE distribution of Basalt followed as mid-plate alkali Basalt mode, while their trace element spider diagrams act as continental alkali Basalt with Nb, Ti rich and Sr loss. REE distribution of Trachyte and Rhyolite are similar, which indicate the same crystalization separation process. S-B diagram and Pearce diagram show that: Granite were partial melted from source region, while Trachyte in ZMY and Rhyolite in LBS originated from the same source region, and occur with the process of crystallization separation with plagioclase adventage.
The Stress Calculation of Refracturing Based on Damage Theory
Authors: Zhao Wan Chun , Wang Ting Ting , Zhang Jing Bo , Yuan Wei Wei
Published: March 2013

To precisely describe the fracture opening and extending during the process of refracturing, in this paper the actual mechanical characteristics of the reservoir before the refracturing has been considered, according to the principle of conservation of energy, the calculation model of the damage stress of the rock around the borehole before the refracturing has been established, and at the same time the calculation model of the fracture veer has been established , then the well A in Jilin Oilfield has been chosen to calculate and analyze, the calculation results demonstrate that the corrigendum between the actual results and the calculation results is 0.2%, which are very anastomosing.
Research on Brittleness and its Definition of Mudstone
Authors: Wei Jing Ping , Ding Zhi Hao , Chen Fan
Published: March 2013

Abstract. Through the uniaxial compressive test, the mechanical parameters and the complete stress-strain curves were obtained, which presented a brittle failure of the mudstone samples of the No.21coal seam in West Henan. Soft rock was regarded as no brittle in its failure usually, but in fact it was exactly. It showed that yield failure occurred in some areas and tension occurred inside the specimens because of the samples’ inhomogeneous deformation. The comprehensive decision method of mining surrounding rock’s brittleness was suggested: the brittleness index was more than 25; the strain of rock at failure was less than 3%, and there was brittle stress drop in the complete stress-strain curve.
Impact Energy Calculated by a Plastic Material Deformation
Authors: Wang Fu Ping , Feng Cheng Jian , Xu Chen , Xiao Kai , Yu Yong Min , Yin Zhi Yong
Published: March 2013

Using a plastic material model to assess the injury energy of liver, the material must have excellent plastic deformation and with high-accuracy relationship between impact energy and deformation. In this paper we prepared a plastic material which composited of potassium stearate, paraffin liquid and novolac epoxy resin (F-51) with weight ratio 0.78/0.22/0.04. The elastic modulus values (Automatic young's) and yield stress data (yield strain 2%) were 54.44 MPa and 0.04185 MPa, measured by the Instron-8071. The deformation increased with impact energy obviously in impact experiment, we fit data with both an exponential curve and a second-order polynomial curve, the formulas were E=3.84687*e^(0.07476*Delta V)-3.20572and E=0.02428*(Delta V)^2+0.14718*Delta V+0.9778, the correlation coefficients were R^2=0.9510 and R^2=0.9544, respectively. These results indicated that the impact energy can be calculated from deformation, and the plastic material could be made a better model for assessing the injury energy of liver.
Micro-Study of Soil’s Inherent Anisotropy with PFC Simulation
Authors: Fan Li , Zhang Kun Yong , Luo Xing Jun
Published: March 2013

Based on 2-D PFC, non-circular particle with direction was constructed and specimens with different distribution of long axis orientation were established. Loads were applied in vertical direction. Changes of fabric such as the long axis orientation, particle contact direction and particle contact force in the process of loading were analyzed. It was shown that the larger angle of the loading direction and the long axis orientation, the greater strength of specimen and more anisotropic. It was proved by the numerical analysis that tendency of particle contact stress direction is the micro – mechanics reasons of soil’s anisotropy under loading.
Effect of β-Cyclodextrin on the Water Loss and Hardness of Frying Chestnut during Storage
Authors: Li Jun Mei , Du Lin Xue , Li Xi Hong , Liu Xia , Liu Hai Jiao
Published: March 2013

The effects of different concentration of β-cyclodextrin (β-CD) (0.5%, 1.0%, 1.5%, 2.0% and 2.5%) on the suppression of dehydrate and hardened during storage hardened were evaluated. The results indicated that β-CD could improve the quality of frying chestnut. A certain content of β-CD could decrease the dehydrate and hardness during storage. The addition of 1.0% β-CD can solve the frying chestnut dehydration and harden during storage effectively.
An Experimental and Numerical Study of Pressure Drop and Hydraulic Behavior in Scaled-Down Fuel Bundle
Authors: Lee Duen Sheng , Hsieh Kai Ting , Tsao Po Chih , Hung Tzu Chen , Chen Yi Tung , Ferng Yu Ming
Published: March 2013

This study presents a scaled-down single fuel assembly experiment to simulate the fuel in the spent fuel pool (SFP). From experiment results, this study obtained the relationship among pressure drop and velocity, the viscous resistance and inertial resistance factor. In computational fluid dynamics (CFD) simulations, the large number of fuel rod bundles is approximated with porous medium technique that imposes similar flow resistance to the motion of the fluid. Difference of the pressure drop between numerical and experimental results is within acceptable deviation.
Low Speed Preconditioning Algorithm Used in the Process of Calculating Euler Equation
Authors: Lei De Bao , Tang Zhong Hua , Zheng Yan Hui
Published: March 2013

This paper describes a numerical method for solving the unsteady Euler equation at any speed. In the process of calculating Euler's equation, the control equation in orthogonal curvilinear coordinate system is discretized by the finite -volume scheme based on the center-difference method, and convection flux used Jameson central deference scheme was solved at every pseudo time step, and the Runge-Kutta method, dual-time algorithm and the implicit LU-SGS add preconditioning algorithm are used for time-marching. For obtaining the numerical solution of two-dimensional unsteady flow around a cylinder and the flow of the Convex Hull, finding that the calculated results agree well with literature values and theoretical analytical solution.
Flight Dynamics Modeling and Analysis of Flexible Hypersonic Flight Vehicles
Authors: Tian Xian Ke , Tang Shuo , Zhu Qiang Jun
Published: March 2013

Facing the difficulty of flight dynamics modeling about flexible hypersonic flight vehicles, from view on the Lagrange’s equations based on dynamic first principle, this paper firstly developed kinetic energy and flexibility potential energy of the vehicle, then achieved concise flight dynamics equations by quasi-coordinates which could fully include coupling characteristics of flight dynamics, and lastly made necessary analysis about the equations. The result of study illustrates that flight dynamics equations of flexible hypersonic flight vehicles based on quasi-coordinates can satisfy the research of dynamics, stability, control,couplings and so on.
Research on Internal-Mixing Nozzle for the Icing Environment Simulation
Authors: Xu Liu Qing , Liu Hai Li , Zhang Feng Quan , Guo Li Li
Published: March 2013

As one of the important part in aviation industry, nozzles are widely applied on the icing environment experiment. In this paper, we design and validate a novel internal-mixing nozzle for the icing experiment. To begin with, based on the requirements of experiment, the main structure sizes of nozzle are designed and the nozzle is processed for measuring droplet diameter. And then in order to investigate the atomization characteristics of droplet diameter, we model inner flow field of the nozzle and external flow field. Grids are divided to guarantee the simulation accuracy. Finally, the experiment is simulated by FLUENT software, and the simulation results of inner and external flow field are discussed respectively. The experiment shows that the simulation results of the nozzle are in good agreement with the test results.
Numerical Simulation Research of Aerosol Cooling
Authors: Zhu Dong Mei , Liu Guo Yong , Zhang Shao Jun
Published: March 2013

Through the establishment of the mixture model and the discrete phase model of aerosol cooling, the heat transfer characteristics between the aerosol and high temperature die steel plate are studied. When the discrete phase volume fraction is greater than 10%, mixed convection heat transfer model is used to study the effect of the gas-water volume fraction on heat transfer characteristics; when the discrete phase volume fraction is less than 10%, the discrete phase model is used to study the effect of the discrete phase mass flow rate and particle size on the heat transfer characteristics. The results can provide important references for the die steel quenching equipment design and production.
The Study of Deepwater Drilling Parameters Optimization
Authors: Zhai Yu Jia , Wang Zhi Ming , Zhang Quan , Gao Qing Chun
Published: March 2013

Calculation and optimization of hydraulic parameters remains one of major challenges when planning and drilling deepwater wells. Based on traditional drilling theory and the characteristics of deepwater drilling, the particularity of deepwater drilling hydraulic parameters design is analyzed. According to the different features of the riser segment, inclined segment and horizon segment, the method for calculating the optimum displacement is proposed in segmental way. Besides, an applicable optimization method is presented for designing deepwater drilling parameters. The predicted value exhibits good agreement with measured value in drilling field, and it has practically guiding significance to deepwater drilling hydraulic parameters design.
Design for Wind Tunnel Testing of Scaled Model by CFD Method
Authors: Hui Zhu , Yang Zhi Gang
Published: March 2013

The numerical investigations presented in this paper deal with wind tunnel testing scheme design for 1/4 scaled MIRA model including supporting system. Based on the structure of aerodynamic and aero-acoustic full scale wind tunnel, using computational fluid dynamics (CFD), focus on MIRA model and supporting system, the drag force of scaled models and supporting system were calculated. By comparing with the wind tunnel testing results and drag force coefficient of reference, it is certain that the wind tunnel testing scheme is available and effective and that the value calculated by CFD is in good agreement with experiments.
Numerical Analysis of Heat Transfer in the Concentric Heat Exchanger
Authors: Chen Hung Chien , Hung Tzu Chen , Chen Yi Feng
Published: March 2013

The computational fluid dynamics (CFD) software is used to compute three-dimensional concentric heat exchanger in this research. In order to reduce the burden of the computational time, the concentric heat exchanger is simplified sector of 5° for the regular arrangement of internal shape. The working fluids for hot flow and cold flow are helium and molten salt individually. The arrangements for hot and cold flow paths within a heat exchanger is opposite. This study is mainly focused on the distribution of field for the two layers of concentric heat exchanger. The width of the flow channel as well as the length, pitch, thickness and angle of fin have been changing to analyze the effectiveness-NTU method. The results showed that the best heat transfer of fin thickness, angle, space, length, and flow channel are under 5mm, 5°, 8mm, 44mm, and 12mm, respectively.
Design of the Wind Channel for the Test-Bed of Aerodynamic Brake
Authors: Cheng Meng Ting , Tian Chun , Wu Meng Ling , Xi Ying
Published: March 2013

For simulating the wind load strength effect so as to detect the opening and closing performance of the aerodynamic braking device and the reliability of its opening and closing mechanism with the wind load caused by high speed flow field, the wind load test-bed is to build. Wind channel, as the equipment to turn a high pressure flow into a relatively high speed advection, is one of its important components. This paper focuses on the design of the shape of the wind channel. By the means of flow field simulation analysis, with the indexes of the wind load size, the pressure distribution and the flow equality, the shape optimization of the wind channel is realized.
Numerical Modeling of Wave Propagation in Poroelastic Media with a Staggered-Grid Finite-Difference Method
Authors: Zhang Wen Sheng , Tong Li
Published: March 2013

In this paper, wave propagation in poroelastic medium is simulated with a staggered-grid finite-difference method. The formulation is discretized based on the second-order Biot’s equations rather than the corresponding velocity-stress form. In order to eliminate boundary reflections, the PML method is applied. Numerical computations are implemented and the results show the correctness and effectiveness of the schemes presented in this paper.
Numerical Simulation of Coupling Heat Transfer in Sealed Airborne Electronic Equipments
Authors: Gao Hong Xia , Xiao Zhan , Xie Yong Qi
Published: March 2013

For shielding radio frequency and electromagnetic interference, the sealed case is usually used for airborne electronic equipment. As electronic products become faster and incorporate greater functionality, their thermal characters must be well analyzed and designed. Three-dimensional thermal numerical simulations from inside to outside of the sealed case were performed to get a clear sight of the coupling heat transfer in conduction, natural convection, and radiation. Temperature field, fluid flow field, and local heat transfer coefficient layout outside the wall were got, which were compared with the outcomes of the empirical method. The results of numerical simulation showed that in sealed case conduction was the dominant way, and natural convection had the comparative ratio with radiation, both of them were less than 25%. The maximum error of no radiation including could get to 43.2%.
Study of Inert Current System Designed for Pressure Control of Micro-Positive Pressure Distillation
Authors: Zhao Shan Fang , Gao Rui Chang , Bai Peng
Published: March 2013

Micro-positive pressure distillation is commonly used in processes where the feed stock or products are oxygen sensitive. Constant column pressure is critical for such process as pressure fluctuations may change column performance and the oxygen-free environment leading to dramatic change in product quality. In this paper, an inert current system designed for micro-positive pressure distillation is introduced. Details of both the operation principle and system features including response time and pressure deviation are studied. Four mathematical equations describing the features are put forward to help select the appropriate parameter. This system is promising for its high sensitivity and simple construction.
The Study on Detonation Front Shape of a Charge Shot by High-Speed Photography
Authors: Wang Zhan Lei , Li Yi Fan , Mei Qun , Wang Hui Ping
Published: March 2013

In order to obtain the detonation front shape and spreading process of detonation wave, Rotating mirror multi-streak technique was used to shoot the detonation process of charge initiated from three points by high-speed photography technique. The record negative was read and these data were analyzed. The time differences of zero-time points and t-y coordinate curve were educed, and the chart of detonation wave shape was drew. The result provides a gist for warhead design. A method for analyzing and studying wave shape is offered.
Comparative Study on Rigid-Flexible Model of Oblique Impact between Cylinder and Ground
Authors: Li Peng , Zhang Ying Xue , Yao Wen Li
Published: March 2013

The oblique impact between cylinder and ground with friction is studied. The applicability and limitation of the classical impact theory of rigid body are verified by building oblique impact between cylinder and ground of flexible model and rigid model respectively. The finite element method is used to build the flexible model of oblique impact between cylinder and ground. It is analyzed that the sliding mode of the contact point, the direction of the friction force and Newton coefficient of restitution during collision varying with different tangential velocity. Comparing the result with the classical impact rigid model, it is proved that numerous sliding modes are existent during collision. Additionally, the applicability of the rigid model is proved in unidirectional sliding mode.
Penetration of Aluminum Targets by Ogive-Nosed Projectiles at Oblique Angles
Authors: Hu Yu Tao , Lu Fang Yun , Jiang Bang Hai , Zhang Duo
Published: March 2013

.In this paper we present the results from a combined experimental, analytical, and computational penetration program. we use an explicit transient dynamic finite element code to model the projectile under an analytical forcing load representing the target. As angle of obliquity is increased free surface effects become significant, The analytical forcing load used here derived from the spherical cavity expansion approach with modifications to account for the free surface effects during oblique penetration. Results from the simulations show the trajectory of the projectile are in good agreement with experiments.
The Double Pendulum Model and Nonlinear Dynamic Characteristics of the Pantograph of High-Speed Train
Authors: Li Hua , Cao Shu Qian
Published: March 2013

In this paper, the double pendulum model of the pantograph was developed, in which a square angular velocity damping torque was used to describe the nonlinear damping torque of the hydraulic vibration damper, and the catenary was described as a variable stiffness spring. Considering the nonlinear factors caused by hydraulic damping and the interaction between the catenary and the pantograph, the motion differential equations based on the double pendulum model were established in Lagrange equation, and then were simplified. The dynamic characteristics were analyzed through numerical simulation. The result of numerical simulation shows that there are quasi-periodic motion and chaos in the system, which are both affected by the pendulum length ratio. The results are helpful to research the dynamic characteristics of the pantograph of high-speed train.
Optimal Spacecraft Attitude Maneuvers via Adjoint Method
Authors: Guo Jian , Yao Yu , He Feng Hua , Yang Bao Qing , Wang Xing Dan
Published: March 2013

This paper studies the spacecraft attitude maneuver optimization problem. The maneuver aim is to avoid fuel cost by only using CMGs in the maneuver course. The nonlinear dynamic equations of the attitude system are established, the attitude maneuver optimization is depicted into a two point boundary value problem (TPBVP). The adjoint method is used to convert the TPBVP into the initial value problem. Numerical results indicate that the adjoint method is efficiently capable for attitude maneuver optimization.
Study on the Damage of Earth Penetrator’s Charge Weight and Depth of the Burst Point to the Runway
Authors: Sun Yu Xin , Wu Yue , Pang Zhi , Zhou Ling
Published: March 2013

In order to explore earth penetrator’s effective destruction to the runway, using numerical simulation as the main means, and combined with some experimental data, a study on the intrinsic connection between series of charge weight, different depth of the burst point and damage area of the runway (blasting crater area) is carried out. The results shows that: for the same charge weight of earth penetrator, there is an optimum depth of the burst point (best penetration detonation depth), and the law which is got from numerical simulation is consistent with the experimental one, which indicates that the material model and calculation parameters of numerical simulation are reasonable, the numerical simulation can replace some research experiment and accelerate research progress.
Research of Ultrasonic Oblique Incidence for Testing Bonding Strength Weakening in SRM
Authors: Ai Chun An , Liu Yu , Gao Xu Zhi , Jian Li
Published: March 2013

According to bonding strength weakening in SRM bonding structure, the decreases of elastic modulus in adhesive layer have been used to characterise the bonding strength weakening in adhesive layer. Ultrasonic propagation characteristics with bonding strength weakening in adhesive layer has been simulated. Based on analysing the relation between reflection coefficient and incident angle, the optimal test strategy has been put forward. According to test strategy, the experiment of ultrasonic oblique incidence has been done to test bonding strength weakening, the average energy of reflected wave from test points has been taken as signal property to characterise reflection coefficient. The results show that the energy of reflected wave can reflect the extent of bonding strength weakening, can effectively achieve quantitative test of strength weakening.
The Green’S Function Solution of Right-Angle Plane Including a Semi-Cylindrical Canyon
Authors: Zhao Chun Xiang , Qi Hui
Published: March 2013

The Green’s function of a right-angle plane including semi-cylindrical canyon while bearing out-of-plane harmonic line source load on horizontal interface have been considered using the methods of complex function and image. Firstly, the wave field of right-angle plane was imaged half space, the scattering wave field, which satisfies the free stress boundary conditions of the right-angle plane on the vertical interface could be constructed. Secondly, a series of infinite algebraic equations be obtained to settle this problem by considering the stress free boundary condition of semi-cylindrical canyon. Finally, some examples for ground motion of a right-angle plane were given and discussed. Numerical results show that displacement of the horizontal surface is influenced by right-angle free boundary.
Reducing Vibration with Advanced Lubricants for Mechanical System
Authors: Jiao Yan Hui
Published: March 2013

Reducing noise and vibration is an increasingly important objective for designers and users of a wide range of mechanical system. Lubricant can contribute to reduction of overall noise and vibration generated by machines, both by reducing generation of acoustic energy in lubricated contacts and by modulating the transmission of vibration through the lubricant. This paper outlines various mechanisms by which the lubricant may affect the generation and transmission of acoustic vibration. Examples from the area of refrigeration compressor lubrication are presented, demonstrating that correct design and selection of lubricant can have a significant impact on noise and vibration.
The Thermal Stress of a Domestic 300MW Steam Turbo Unit during its Startup and Shutdown
Authors: Wang Hai Tao , Xia Yun Chun
Published: March 2013

The simulation system on the thermal stress of the rotor during startup & shutdown for a domestic 300MW steam turbo unit, by the simulation, the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shutdown. The max thermal stress & the max combined stress produced on the rotor of a medium pressure cylinder was about 16% bigger than those on the rotor of the high pressure cylinder when they had the same increase rate of temperature. When thought from economics & safety, the optimal temperature-increase-rate of the rotor was 1.6°C/min when the unit startup at cold state, but it was 1. 8°C/min when started up and shut down the unit at hot state, it’s optimal for slipping-parameter and the optimal temperature-decease-rate of the rotor was 0.85°C/min.
Frequency and Amplitude Dependent Dynamic Model of Rotor Elastomeric Damper with Refined Nonlinear Stiffness
Authors: Li Rui Rui , Yang Wei Dong , Yu Zhi Hao
Published: March 2013

Elastomeric damper is a very important component for helicopter rotor system; its dynamic property has strong nonlinear behavior characterized by complex hysteresis loops, and dependence on excitation frequency, amplitude and temperature. Based on internal variables theory, combined with the nonlinear spring model, a time domain nonlinear dynamic model of elastomeric damper used for helicopter rotor load prediction is presented. The model was characterized by using the genetic algorithm, the hysteresis loop of elastomeric dampers made of different elastomeric materials under several excitation frequencies and strain amplitudes was calculated with this model and compared with experimental data. It is shown that the presented model can predict the hysteresis loop of the elastomeric dampers with little relative errors, and the model is able to catch the variation of dynamic stiffness. Therefore, the presented method can be used for helicopter rotor load prediction and aeroelastic analysis.
Study on Frequency Tuning of Parallel Mechanism for Reducing Vibration
Authors: Yang Feng , Niu Jun Chuan , Li Kun Peng , Li Yong
Published: March 2013

To reduce the multi-dimensional vibration which exist in some vibrating machines or equipments such as running ambulances, a parallel mechanism with 3-translation DOFs was presented and introduced into the ambulance stretcher, then a three-translation vibration reduction platform was developed. The kinematics and dynamics equations of the presented vibration reduction platform were deduced. And then the workspace, tuning principles and dynamics characteristics were studied. The simulations show that the presented parallel mechanism or vibration reduction platform is valid for reducing vibration and the system has different natural frequencies in case that the upper platform of the mechanism works on some specific positions, so it can be used to achieve tunable vibration control.
Reseach Progess of Microperforated Panel Absorber
Authors: Zhang Bin , Gai Xiao Ling , Li Xian Hui
Published: March 2013

Microperforated panel (MPP) absorbers have been developed rapidly and used in many fields in recent years. First, based on the Maa’s theory, the theoretical development of MPP is reviewed in this paper. Furthermore, structure design and processing technology of MPP are introduced. Finally, the further development of MPP is discussed.
Vibration of a Tube with the Axial Loads and Fluid
Authors: Huang Bo Wun , Tseng Jung Ge , Kuang Jao Hwa
Published: March 2013

Vibration of a tube with the fluid and axial load is focused. In a heat exchanger, the tubes are frequently affected by external force and fluid shock waves. Thus, tubes are often found to be vibrated. This vibration may alter the performance of the tubes and global heat exchanger. That a heat exchanger system is weakly coupled as the each tube is coupled to the adjacent one through the fluid is found. To understand the global system dynamics, the dynamics of a tube must be investigated first. In this work, the dynamic properties of a tube with the axial loads are investigated. The Galerkin method employed, the equation of a tube with the fluid effect can be to derive. Numerical results reveal that the axial load and fluid effects may affect the dynamic properties of a tube with fluid significantly.
FRP Truss Bridge Construction Technology Research and Application
Authors: Xia Xiao Ning , Yang Yong Xin , Yao Yong , Yue Qing Rui , Zhang Peng Yang , He Jun
Published: March 2013

For the rapid erection of FRP truss bridge, based on the FRP material characteristics, it was put forward to a suitable FRP truss bridge construction hoisting technology. Hoisting technology was divided into two types: integral hoisting and segment hoisting. This article mainly researched and analyzed the aspect of the selection of hoisting scheme, the selection of hoisting equipment and hoisting point, expounded emphatically the selection principle and method of hanging point when hoisting, and checked hoisting point in different cases. Certain references were provided for the subsequent FRP truss bridge hoisting erection.
Dynamic Response Analysis for Space Grid Structure with Different Boundary Conditions
Authors: Mu Ying Cai
Published: March 2013

Through the ansys software, we analysised the space truss structures for its dynamic response and observed its formation of frequency diagram . Based on the analysis of the observation ,natural vibration rules of the space truss structure are discussed. In the process of analysis, We got the conclusions of the support conditions of the change and support amount of adjustment to the influence of the space truss structure vibration frequency.
The Discussion and Analysis of Light Steel Residential Envelope Structure Energy-Saving Materials
Authors: Zhang Xin Zhong , Zhang Yin , Pang Rui Yan , Tang Ke Dong , Lu Mei Jun
Published: March 2013

This article based on the characteristics and energy-saving requirements of light steel structure housing maintenance, summary of applies respectively situated in the light steel structure residence in various parts of the external wall, roof, and exterior window of common building materials, While discuss and analyze advantages and disadvantages of various material combinations, and finally according to the site material characteristics put forward the corresponding improvement measures.
Analysis Floor Failure Characteristics of 7122 Working Face in the Qinan Coal Mine Based on the Plasticity Theory
Authors: Han Lei , Meng Xiang Rui
Published: March 2013

In order to study the floor damage depth of 7122 working face in the Qinan Coal Mine, we used Key strata theory and elastic-plastic theory to analyze the activities mechanisms and characteristics of the surrounding rock. By theoretical calculation obtained floor strata failure depth 8.79m of 7122 Face Mining; The horizontal distance of from the greatest floor damage depth to the coal wall is about 5.71m; The goaf floor failure distance is about 25.44m. Combined with the results of plasticity theory, we had drawn floor damage feature maps of 7122 working face in Qinan Coal Mine.
The Design of Smart Meter for Civil Airports Covered Bridge Equipment Based on ATT7022A
Authors: Li Zong Shuai , Chen Wei Xing , Zhang Ji Hong , Fei Chun Guo , Sun Yi Gang
Published: March 2013

According to the electricity metering of civil airports covered bridge equipment, the smart meter is presented based on ATT7022A and AT89C52. The smart meter has the interface of RS485 bus, so it can achieve network control function. Based on the hardware system’s general structure, the design of the three-phase voltage and current measuring circuits and some precautions, we designed the SPI communication interface of ATT7022A and AT89C52, and we gave the software correction flowchart of smart meter. Finally we know that the design of smart meter based on this scheme is simple and effective.
Analysis on the Condition of the Electric Energy Metering Device and the Strategy of Inspection
Authors: Cheng Ying Ying , Yang Hua Xiao , Xiao Ji
Published: March 2013

The article points out that it is necessary to apply condition evaluation and condition test to the electric energy metering equipment, based on the actual working condition of electric energy metering equipment. Then, the data of voltage, current, power, frequency, temperature, humidity and so on, are collected by the condition detection equipment of the electric energy metering equipment. Coupling with the errors come from the standard meter and the periodic test on the spot, this article takes the suitable data as parameters, and synthetically evaluates the influence of complicated grid operating environment on accuracy and reliability of energy metering equipment. The criteria which reflect the condition value of the electric energy metering equipment are analyzed to determine the weight of each criterion, to establish the condition evaluation criterion, and to form the condition evaluation system. According to the state evaluation results, different inspection strategies are proposed.
Performance on OCDMA Encoder Based on Photonic Crystal
Authors: Xia Qing , Chen Hui
Published: March 2013

Encoder with a hexagonal lattice photonic crystal was performed by OCDMA simulation model. Filtering of photonic crystal cavity was used for encoding in spectral domain, and the distance between the dot defects was used for encoding in time domain because of its slow light effects caused by dispersion, whose time delay reached orders of ns magnitude. According to the simulation, the BER of OCDMA system with PC encoder is 10-23, while BER is 10-18 in the system with FBG encoder. By contrast, it is indicated that PC encoder requires strict demands on its own structure. With mismatching of encoder and decoder in receiving terminal, BER decrease to 10-7, and the performance of OCDMA system is serious affected.
The Research and Implementation of a Kind of Simulating Manual Electronic Charging Machine Tester
Authors: Wu Yong , Lu Xiao Yan , Wu Yu Bing , Xing Jian Ping
Published: March 2013

To solve the test problems of electronic charging machine, and to change the original test module based on artificial test. This paper described the research and implementation of a kind of electronic charging machine tester with an embedded system controlling step motor. The tester could imitate manual swiping and achieve swiping automatically. It used LCD and LED display technology, and could display the tester’s working condition and the number of swiping. The realization of this kind of tester will get rid of the original testing way of car charging machine and change the test method, meanwhile improving work efficiency.
Application of New Matching Technique in Doherty Amplifier
Authors: Chen Jun , Shen Guo Qing , Su Kai Xiong
Published: March 2013

According to the shortage of the traditional offset line in Doherty power amplifier, a new offset line technique is proposed to match carrier amplifier with the load and to improve the performance of the Doherty amplifier. By simulation of the computer software, a higher efficiency is obtained using the new offset line comparing the two kinds of offset lines. The new offset line matching technique could be applied in the system with high linearity and low power operation.
Based on Machine Vision of Smart Meter Recognition and Accurate Positioning Technology Research
Authors: Ou Xi Yang , Hou Xing Zhe , Zheng Ke , Wu Hua , Peng Peng
Published: March 2013

This paper researches on machine vision recognition and positioning technique which can help robot automatically recognize and accurately position smart meter in complex industrial environment. Firstly, crude position of the smart meter is obtained by recognition of liquid crystal display (LCD) screen through picture pre-processing. Secondly, the center positions of four screws are identified. Thirdly, the outline of the meter is calculated by geometric locations of the four screws, thus the meter is identified from the image and accurate position of the meter is calculated though the this paper’s algorithm. Experiments show that our algorithm can identify the meter rapidly and calculate the accurate position in complex environment, so the proposed algorithm is practical valuable.
A Bubble Detection Algorithm Based on Wavelet Transform and Canny Operator for Deinked Pulp Flotation Column
Authors: Tian Ye , Qian Hua , Ke Qiu Hong
Published: March 2013

Deinked pulp flotation column has been applied in wastepaper recycling. Bubble size in deinked pulp flotation column is very important during the flotation process. In this paper, bubble images of deinked pulp flotation column are first caught by digital camera, and then the bubbles are detected by using a bubble detection algorithm based on wavelet transform and canny operators. The results show the algorithms are very practical and effective on bubble detection in deinked pulp flotation column.