bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on Two Test Methods of the Normal Distribution
Authors: Wu Jin Huang , Wang Jun Sheng , Wang Yi Dong , Lei Jun Wei
Published: June 2013

The characteristic value of the normal parent population, such as the mean, the percentile, the percentage, the standard deviation and the coefficient of variation, are often tested in engineering. The Shapiro-Wilk test and Epps-Pulley test are established in this paper to get the characteristic value of the normal parent population, which can satisfy different practical requirements.
The Research Status and the Development Trend of Protection in DC Distribution Power System
Authors: Xue Shi Min , Jin Yi , Chen Chao Chao , Wang Ying
Published: June 2013

DC distribution power system has the characteristics of high power quality, high transmission capacity and low power outages cost, and can adapt to multi-point access to distributed generation. It will become a new direction in the field of distribution power system. This paper focuses on the research status and development trend of the DC distribution power system protection and control technology, and summarizes the protection and control technology, which are necessary to be carried out in the future research.
Study on Mechanical Properties of PP Modified by β Nucleating Agent under the Low Temperature
Authors: Zhu Jiang , Liu Xiang , Xu Qiang , Cao Liang
Published: June 2013

The ethylene-propylene polymer (PP) was modified by using a rare earth β-nucleating agent (WBG-II). The crystallization characteristics of PP induced by WBG-II were investigated through the wide-angle X-ray diffraction (WAXD). The effect of β-nucleating agent on the mechanical property of PP under low temperature was also researched. The results confirmed that β-nucleating agent WBG-II can change the crystal structure of PP and induce the β-form crystals in the PP to develop. Moreover, under the room temperature, with the increment of WBG-II, the tensile strength, bending strength and modulus of the modified PP increase, but the impact strength and elongation at break decrease; and especially at-10 °C, this tendency is more obvious.
Designing Experiments to Affect Post Weld Heat Treatment Parameters: Using the Full Factorial Design in Inconel X-750 Welds
Authors: Peasura Prachya , Poopat Bovornchok
Published: June 2013

Alloy X-750 also has excellent properties down to cryogenic temperatures high stability and strength at high temperatures. This reason the alloy is used in manufacturing of gas turbine hot components. The research was study the effect of post weld heat treatment (PWHT) parameter on hardness and microstructure. The specimen was Inconel X-750 grade sheet of 2.8 mm thickness. This 23factorial design was used in experimental various post weld heat treatment at 705 and 845°C for 20 and 24 hour including solution temperature at 1,000 and 1,150°C. The welded specimens were tested by hardness testing in fusion zone (FZ) and heat affected zone (HAZ). The result showed that both of solution temperature, PWHT temperature and PWHT time interaction on hardness of FZ and HAZ at 95% confidential (P value < 0.05). The PWHT temperature and PWHT time interaction effect was the largest. The factor showed in the hardness increase with the low level (-1) of PWHT temperature and PWHT time for the hardness while it trended decrease for the solution temperature. The microstructure was the γ amount and small size would result in high hardness. Experimental results showed that the solution temperature at 1,150°C, PWHT temperature 705°C PWHT time of 20 hours provided intensity of gamma prime (γ) and MC carbide resulting in higher hardness both in FZ and HAZ.
Research on Dyeing Process of Cotton Fabric Modified with Color Media
Authors: Li Zhu Jun , He Xiao Xia
Published: June 2013

To optimize the dyeing condition of cotton fabric modified with color media, the effects of dyeing time, temperature and amount of color media were studied in the paper. The results exhibited that the exhaustion of cotton fabric modified with color media increased greatly, even up to 97.1%. The optimal dyeing condition can be defined as follows: the dyeing time of 36 min, the temperature of 50 °C and the amount of color media of 5% (o.w.f).
ST14 Material Stamping Process Applications of Finite Element Analysis
Authors: Yuan Xiao Jiang , Zhang Qiu Ju
Published: June 2013

ST14 material around the back door window frames of the front bracket parts for the carrier, and to AutoForm stamping process finite element analysis software as a platform for ST14 experience of the material structure process simulation of material forming process, the analysis of the parts stamping process defects through repeated amendments of Part Process structure, to achieve the purpose of stamping process defects.
Research Progress of Three Kinds of Enhanced Heat Transfer Structures
Authors: He Zhan Shu , Liu Xiao Long , Yang Xue Fei
Published: June 2013

In order to transfer heat as much as possible through a unit area in unit time, this paper introduces three enhanced heat transfer structures, namely microchannel, open-celled metal foam and open-celled sintered porous metal. From two aspects of the heat transfer performance and the flow resistance, this paper reviews their research progress. Among three kinds of enhanced heat transfer structures, open-celled sintered porous metal has the best heat transfer performance, followed by open-celled metal foam and micro-channel. While, the sequence of the pressure drop of three kinds of enhanced heat transfer structures is in the reverse order. Thus, Enhanced heat transfer Structures with good heat transfer performance and small pressure drop are the future research direction.
The Study of Monitoring and Control in the Urban Traffic Noise
Authors: Tong Yong Xing , Jiang Yong Qing , Zhou Zhen , Ma De Zhong
Published: June 2013

In recent years, with the development of the automobile industry and urban traffic, the pollution of road traffic noise in Harbin has become more and more deleterious. After a detailed survey, it was found that the study about the situation of traffic noise pollution in Harbin was less and the result of evaluation was not accurate enough. In addition, the monitoring spots selected were so many that the workload was too heavy. Aim at this phenomenon, a new and comprehensive monitor on road traffic noise in Harbin and evaluation studies was done. The research was according to the state standards. The selected 35 road sections, the source of traffic noise and the state of traffic noise in Harbin and the state of traffic noise pollution were monitored detailed. The temporal and spatial distribution analysis on the source of traffic noise pollution in Harbin was carried out according to the monitoring datum. Through the monitoring safety analysis and overall character analysis on the state of road traffic noise, it was educed the phenomena of road traffic noise was serious pollution in Harbin. The mean value of equivalent continuous sound pressure level was 72.5dB, exceed state criterion about 2.5dB. Traffic noise of region was concluded that Daowai district>Daoli district>Xiangfang district>Nangang district by the traffic noise monitoring and safety analysis. Finally, the researchers found out the main factors which influence the state of road traffic conditions in Harbin based on the previous studies, and provided the countermeasures to reduce the noise.
Dynamic Response and Vibration of a Cantilevered Beam under an Accelerated Moving Mass
Authors: Ryu Bong Jo , Kim Hee Jung , Kim Young Shik
Published: June 2013

In this research we investigate dynamic responses and vibration of a cantilevered beam subjected to a moving mass with variable speeds. Governing equations of motion under a moving mass are derived by Galerkin's mode summation method considering the effects of all forces acting on the beam (gravity force, Coriolis force, inertia force caused by a slope of the beam, and transverse inertia of the beam). A Runge-Kutta integration method is then applied to calculate dynamic responses of the beam. The effects of the speed, acceleration and the magnitude of the moving mass on the response of the beam are investigated in these numerical analyses. Furthermore, experimental tests are conducted to validate our analysis.
The Selection of the Difference Scheme in Numerical Simulation of Low-Rise Gable Roof Surface Pressure
Authors: Wu Jian Feng , Wang Cai Hua , Zhang Xue Qin
Published: June 2013

Using the FLUENT software, this paper taking the wind load shape coefficient in the current code for the design of building structures as the comparison standard, have numerical wind tunnel simulation of the wind the surface wind pressure on low layer double slope roof. It focused on the effect of four convective term difference schemes on the numerical simulation, such as First-Order Upwind, Second-Order Upwind, Power Law and Quadratic Upwind Interpolation for ConvectiveKinematics. It provided reasonable reference for selection of convective term difference format.
The Research on the Methodology of Diagnosing the Fault of Bearing in Warships Based on NS-EMD
Authors: Huang Jin E , Xu Dong , Wang Yan Lei , Zhang Yang , Wang Shuang
Published: June 2013

EMD is now a commonly used nonlinear and instable signal processing method, but it has boundary runaway and modal aliasing. The single disunited IMF cannot well reflect the characteristics of the respective vibration source. Therefore, in order to suppress the boundary runaway that will appear in the process of EMD, the image method is used to extend the length of signal data. To solve the modal aliasing, it is necessary to decompose the extended data by the EMD method, to distinguish the IMF that produces modal aliasing after decomposition, to integrate it according to the integrity of the EMD and then to re-decompose it after adding broadband white noise with the average value of zero. On the basis of that, it is better to improve NS-EMD method and realize the AM-FM demodulation by standardized method. By the spectrum analysis, we extract the fault characteristics of rolling bearings and propose a method to diagnose faults of rolling bearing. The results of analyzing the simulation and the vibration signal of fault rolling bearing shows that the method can effectively extract fault characteristics of rolling bearing.
Experimental Modal and Vibration Analysis of High-Speed Industrial Sewing Machine
Authors: Zhang Li , Wu Hong
Published: June 2013

With the vibration exciter, the experimental modal analysis and vibration analysis of high-speed industrial sewing machine was carried out in this paper. The results show that the sewing machine will be of resonance at the operating speed of 4000r/min, which means the structure of the chassis of the sewing machine should be optimized.
Reactive-Power Optimization Research Based on Load Fluctuation and Distributed Control
Authors: Dou Wen , Cheng Xin Gong , Zong Xi Ju , Pei Xing Hua
Published: June 2013

This paper proposes a voltage-reactive power optimization, which is an integrated system based on centralized optimization and distributed control, to confine the action numbers of control devices. The system includes VQC (voltage and reactive power control system) and the optimal power flow calculation in the master station. By using the fractal theory, the original data in the range of nonperiodic cycles are divided into several time-intervals. After this processing, the optimal points are obtained by optimal power flow in every segment. Based on the load fluctuation rate, in every period, the voltage / reactive power limits of nine area figure are set. As the load fluctuation rates changed in every segment, voltage / reactive power limits are different. And the tap changers and switchable capacitor banks are regulated according to each upper/lower limits and the optimal points. Furthermore, correctness and effectiveness of the proposed method have been confirmed. And the simulation results show that it not only reduces power losses but also restricts the action numbers of control device.
Modeling Approach to the Elements of TQM Practice
Authors: Fazlollah Agamohamadi Basmenj , Rosnah M. Yusuff , Norzima Zulkifli , Yusof Ismaiel , Shahryar Sorooshian
Published: June 2013

This paper considers three factors; the selection of the Performance Measures, selection of the Critical Success Factors, and selection of quality tools as three elements of TQM. The qualitative research of this study tries to find and model the interrelation between elements of Total Quality Management (TQM) practice in companies.
Research on the Optimization of Operation Mode Based on Investment and Financing Platform in the Western China
Authors: Su Ying Sheng , Ren Wei Jin , Li Xue Jun
Published: June 2013

The article mainly aims at the problems which including the single channel common existed in the local government investment and financing platform in western region, the poor ability of debt paying and the shortage of funds. It puts forward that in the operation mode industry chain business design should be appropriately extended, the financing mode should be expanded and implementation of debt restructuring. Meanwhile, it correspondingly gives relevantly alternative plan. At the end of improvement, there is more extension in industry chain business design with the local government investment and financing platform. It is not only as a function of government financing, but also as the function of the marketization of the modern company.
5-Methyl-Benzofuro[3,2-b]quinoline Derivatives as DNA Binders
Authors: Zhang Rui Fang , Zhang Rui Rui , Lu Yu Jing , Du Zhi Yun , Fu Cheng Jie , Tang Zhi Kai , Fang Yan Xiong , Zhang Kun
Published: June 2013

Several derivatives of 5-methyl-benzofuro [3,2-quinoline (O-isostere of cryptolepine) were synthesized. Spectrometric experiments and molecular modeling indicated that these derivatives interacted with duplex DNA by intercalation binding mode. The derivatives with aniline substituent exhibited superior DNA binding affinity to that of lead compound 5-methyl-benzofuro [3,2-quinoline.
Inventory-Up-Level Joint Replenishment Model for Re-Working Materials and New Materials
Authors: Yang Nang Shu , Huang Chen Yuan , Hou Meng Chong
Published: June 2013

In order to reduce cost, defective products are re-worked and regarded as new sources of materials with normal production schedule in the joint replenishment problem. In this research, inventory and replenishment problems with respect to the heavy loading of inventory system and production line shutdown will be solved. The break-even upper bound of safe inventory for the risk cost of over-inventory and the ordering costs of joint replenishment are considered. In the meanwhile, the limitation of inventory will impact the cycle time of material replenishment with consideration of new materials and re-worked defective products. Within the break-even upper bound of safe inventory, this research will find the optimal replenishment model with combining new materials and re-worked defective products.
Governance Mechanism of Relational Risks in Supply Chain
Authors: Zhao Xiao Hong , Chen Li Wen
Published: June 2013

This paper aims to discuss the relational risks in supply chain and its governance mechanism, including formal and informal control mechanisms and trust development mechanisms, to provide a new idea of relational risks management in supply chain domains and then enhance the interests of all involved parties. The governance efficiency of relational risks in supply chain can be improved by control mechanisms associated with trust development mechanisms, and both of which are dynamic complementary. Initial trust among partners impacts the inter-organizational relational performance and the choice of control mechanisms, at the same time, the outcomes of relationship and the development or destruction of trust mechanisms are affected by control modes.
Strategies for Construction Quality Control in Colleges and Universities of China
Authors: Huang Peng
Published: June 2013

Construction scale in colleges and universities of China are large, the cost is high, construction technology is complex, having to meet high requirements of security and green environmental protection. In reality, there are some issues such as the lack of interest people in the construction, and regulation is not in place; importance are only paid on results control, before and after quality control have been ignored; the quality of quality control personnel is low, who lack appropriate professional skills. Therefore, Chinese colleges and universities should make efforts to improve quality control staff's legal consciousness and sense of responsibility, and improve the quality management system, improve skills of staff quality management, improve the system of supervision and management strategies to strengthen the quality control of construction engineering.
Effects of Heat Treatment on the Creep Crack Growth Behavior in Al/Al-4wt%Cu Functionally Graded Material
Authors: Yu Shuang , Dong Wei , Xu Fu Min , Fu Ming Bi , Tan Yi
Published: June 2013

A conventional hot-pressing method was used to produce Al/Al-4wt%Cu functionally graded material (FGM). Heat treatment, which included solid solution treatment (T4) and aging treatment (T6), was carried out on hot-pressed (F) specimens. The creep crack growth tests were performed under constant loading of the creep-testing machines. The distribution of copper composition was investigated by line analysis via electron probe microanalysis. Fracture morphology and creep crack paths were studied by scanning electron microscopy. During heat treatment, the thickness of the graded transition layer increased due to copper composition redistribution. Creep crack growth retardation was found when crack propagated from the graded transition region to the Al-4wt%Cu layer. Greater improvement in creep crack growth resistance was achieved by the T4 and T6 states of Al/Al-4wt%Cu FGM. For T4 and T6 state specimens, the micro-cracks and crack kinking in the transition region were observed, which prevented creep crack growth.
Material Flaw Sizing by Ultrasonic Multipath Detection
Authors: Shen Xi Zhong , Li Pan
Published: June 2013

Sizing of material flaw is addressed in the multipath scene, and a method is developed to detect an isolated sized flaw and estimate its height based on imaging theory of different path profiles. A signal model based on the multipath higher order reflections of the flaw is built to detect the sized flaw. Multipaths are predicted and identified on the basis of the direct reflection path, which is relatively easy to be identified using the conventional flaw detection techniques. Direct reflection path and combined path are applied to detect the flaw from the top, and multipath w is to detect its bottom of the flaw. Ultrasonic imaging is formed and synthesized by all the identified multipaths, which shows the size of the material flaw. Simulations and experimentations demonstrate that the flaw sizing can be calculated utilizing the time-of-arrivals of the multipath signals.
The Broyden Method for M-P-Φ Relationship of Beam-Column with Residual Stresses
Authors: Qin Jian , Xia Yong Jun , Zhang Jin Miao
Published: June 2013

The Broyden method for the numerical calculation of Moment-Thrust-Curvature (M-P-Φ) relationship of beam-column is put forward, which is suitable for all combinations of moment, thrust and curvature considering the effect of residual stresses. The relationship problem is simplified as two nonlinear equations of four variables. When two of the 4 variables are given, the relationship can be obtained by Broyden method. The advantages of Broyden method are discussed and the iterative calculation process is listed. The method offers significant improvements in accuracy, robustness and calculation amount of the solution, which can be used for beam-columns with any type section.
The Study of ANSYS-Based Finite Element Calculation Model for Push-Back Rack
Authors: Li Bei , Wang Zhuan , Wang Yi Li
Published: June 2013

A kind of calculating model was proposed according to the structure and load characteristics of push-back rack. On the basis of study on modeling and analysis technology using ANSYS, the finite element analysis of push-back rack was realized, which can provide reference to the design and calculation of push-back rack.
Finite Element Analysis of the Car Door Sinking Stiffness
Authors: Liu Hong Jun , Zhi Shu Ya
Published: June 2013

This paper describes an analysis process of the sinking stiffness that is a simplified car door model using finite element method. First, it has set the car doors assembly model in ANSYS with the APDL command flow. Then phenomena and data are obtained from the experiment. At last, by optimization is got from the analysis of this data. So it can provide methods and references of the optimization of a car door structure.
Study on Entity Model's Fast Surface Reconstruction
Authors: Wang Shi Gang , Zhang Jian Zhou , Zhang Hong Jun , Jiang Shu Feng
Published: June 2013

In the software system of reverse engineering, fast surface reconstruction has become an important development trend. This article introduced the realization of free-form surface's NURBS reconstruction and the work flow based on Geomagic Studio, Through the example of Geomagic surface phase shape module and fashion module under 3 different processing methods of case analysis, summarizes the main features of fast surface reconstruction based on Geomagic Studio software, and puts forward the application prospects.
Numerical Simulation of Cavity Flow within the Flow Field
Authors: Cai Jian Yu , Chen He Juan
Published: June 2013

Analysis of numerical simulation was used on flow field and temperature field in mechanical seal cavity. It borrowed a new calculation method, which was more visual and simpler than before. And this method analysed the change in temperature field of mechanical seal ring and the distribution of temperature and pressure in the flow field when mechanical seal was working. The result showed that the numerical simulation method was effect to the flow field in centrifugal pump.
Development of an Advanced Machine Tool for Combined Forming-Strengthening Process for Production of Load Bearing Aircraft Panels
Authors: Kutin Andrey A. , Turkin Mikhail
Published: June 2013

This paper presents the development of a machine tool which combines the forming and the surface strengthening processes for large scale aircraft parts together. The developed machine tool produces the required part shape not by bending but by combination of differential compressive plastic stresses induced by shot peening to different areas of the part in a predetermined sequence. It has a total mass under 4200kg and is capable of forming and strengthening panels of 15x1.5x0.02m3 in size. The machine tool has been successfully applied for production of honeycomb wing panels of Be-200 multipurpose amphibious aircraft made of aluminum alloy.
Self-Recovery and Re-Degradation Phenomena for PZT Ceramic
Authors: Luo Min , Zheng De Yi , Huang Fei
Published: June 2013

Lead zirconate titanate (PZT) ceramic as a kind of widely used piezoelectric material is developing very fast for these years because of its high piezoelectric properties. Therefore, various theories have been developed for describing the mechanism of the degradation process of the PZT ceramic [1-4]. However, there are still many contentions in these reported theories. In this paper, experiments on commercially available lead zirconate titanate (PZT) ceramic samples have been designed. Through this work, it has been found that the leakage current is increasing with the electrical degradation process of the PZT ceramic. Self-recovery and re-degradation phenomena and formation of black spots have also been observed. It has suggested that the duration of the re-degradation process depends on the duration of the self-recovery and the re-degradation process would not produce any black spots and the black spots are only formed during electrical degradation process.
Numerical Simulation on Cylinder Flow Field of Diesel
Authors: Song Yin Dong , Yuan Yin Nan , Wu Chun Ping , Li Yong Wang , Qi Peng Zhe , Wang Shuang Bo
Published: June 2013

Three dimensional transient numerical simulation on cylinder flow field of 4B26 diesel was done by AVL FIRE. Detailed flow field structure of diesel cylinder was calculated. The typical swirl flow and squish flow were established in 4B26 diesel engine chamber. swirl flow and squish flow can increase the fuel and air mixing rate, and can improve diesel combustion and can reduce emissions of pollutants. Oil beam could accelerate the air around it.
The Research of the Dynamic Characteristics of Horizontal Jig Boring Machine
Authors: Li Zhi , Zhao X. S. , Zhang D. W.
Published: June 2013

Modal analysis is one way of studying the dynamic characteristics of the mechanical. In order to study the dynamic characteristics of machine tool,numerical machine model is set up with finite element analysis software,of which validity is verified by experimental modal analysis.The experimental test also provide the boundary conditions, so as to further structure modification and dynamic characteristic design
Asymmetric Sinusoidal Motion Effect on Aerodynamics of a Plunging Airfoil
Authors: Zhang Yi , Yuan Rui Shan , Lu Kun , Xie Yong Hui
Published: June 2013

The effect of asymmetric sinusoidal motion on plunging airfoil aerodynamics was studied by numerical simulations for 2-D flow around a NACA0012 airfoil at Re=1.35×105. Various unsteady parameters (nondimensional plunging amplitude, h, reduced frequency, k) were applied to investigate the effect of asymmetry parameter S on the instantaneous force coefficient and flow pattern. It is found that more thrust can be generated by asymmetric sinusoidal plunging motion compared with pure sinusoidal case, and the thrust force generated increases with asymmetry. Moreover, a significant difference in the wake pattern at different values of S is observed. The trailing wake is displaced downward relative to the free stream for S less than 0.5, and displaced upward for S larger than 0.5.
Performance Simulation Comparison of Five-Plunger-Type and Three-Plunger-Type Straw Fuel Forming Machine
Authors: Wang Feng Hui , Ma Bei Yi , Bu Xue Jun
Published: June 2013

Straw fuel is a renewable organic fuels which has good combustive, its substitutable action of the raw coal meets the national strategic goals of sustainable development demand. Design proposal that is five-plunger-type straw fuel forming machine has been put forward according to three-plunger-type straw fuel forming machine which had been succeed in developing, its main purpose can meet the rapid growth of market demand for straw fuel, overcome disadvantage of three-plunger-type straw fuel forming machine which have not much higher productivity, give play to produce straw fuel advantages of compact structure, high combustion efficiency, and maximize favourable factors and minimize unfavourable ones. feasibility analysis for five-plunger-type straw fuel forming machine mainly revolves around several areas to unfold including productivity effect, design optimization and stability of motions and so on. Analysis results can be directly certified the project's necessity and economic value.
Launch Dynamic Characteristic of High Initial Velocity Grenade Launcher with Low Recoil
Authors: Song Jie , Liao Zhen Qiang , Qiu Ming
Published: June 2013

In order to reduce the recoil of High Initial Velocity Grenade Launcher (HIVGL) and obtain better firing precision, two reduction recoil structures - short recoil barrel structure and laval nozzle structure were used for HIVGL. Virtual prototype simulation model of HIVGL were established, the dynamics curves of automatic mechanism of HIVGL and human shoulder force curves were obtained when HIVGL was launched by dynamic simulation software - ADAMS. The motion characteristics of automatic mechanism and the variation regulation of the maximum shoulder force were analyzed with different combinations of HIVGL structures and nozzle chamber charge amount. The barrel floating spring stiffness, pre-pressure and the effect of barrel stroke on spring energy storage were also analyzed. As proved by the research results, the maximum recoil of HIVGL can be greatly reduced by introducing short recoil barrel structure and laval nozzle structure. This result provides a beneficial reference for structure design and optimization of HIVGL.
Analysis of Arc-Shaped Support Plate Influence on Muzzles Vibration of Gatling Gun Fire on Tripod
Authors: Li Jia Sheng , Liao Zhen Qiang , Qiu Ming , Wang Fei
Published: June 2013

To improve the firing stability of Galtling gun by installing an arc-shaped support plate on a light tripod,a firing dynamic model of Gatling gun shooting on light tripod which has a arc-shaped support plate fixed on the different positions established based on rigid-flexible multi-body dynamic theory. The muzzles vibration and tripods deformation obtained through dynamic simulation. The results show that while the arc-shaped support plate fixed close to the bracket, the supporting effect to Galting gun decreased, tripods deformation and muzzles vibration increased. On the contrary, it reduced muzzles vibration and enhanced the firing stability. The analytic results provide a reference to improve the arc-shaped support plate in tripod.
Research on Dynamics of High-Efficiency Recoil-Reducing for Muzzle Brake of Chain Gun
Authors: Xiao Jun Bo , Yang Guo Lai , Zhao Yan , Qiu Ming
Published: June 2013

In order to reduce the recoil energy of the chain gun, this paper put forward a high-efficiency recoil-reducing way with new-style high-efficiency muzzle brake and buffer parameter combined by studying the modeling and simulation of low recoil firing of chain gun. This paper studied the variation rules of gun recoil movement and recoil force of muzzle brake on three states. The results show the recoil of chain gun can be reduced significantly by using high-efficiency muzzle brake and selecting suitable parameters for buffer compared with that of only using muzzle brake and buffer. The research results put forward theoretical basis and application reference for studying high power low recoil chain gun.
Study on Precision Analysis and Simulation Test of Upper Slicing System
Authors: Zhao Wen Hui , Liu She
Published: June 2013

The multislice spiral computed tomography (MSCT) is famous for the small radiation,large volume scanning and quickly reconstruction, and it becomes the first choice in clinical examination. The upper slicing system is the main components of the optical system in MSCT. This paper focuses on the design of upper slicing slice system and its precision analysis to improve the precision of imaging. The error of slice thickness and ray center by bearings, screw and control system is analyzed and tested. Improving the precision of the upper slicing system contributes to determine the appropriate treatment methods to improve the success rate of treatment.
Applied Research of the Microstructure Replication Technology
Authors: Chen Hua Wei , Li You Jie , Zhang De Yuan , Huang Yi Jun , Wu Rui Biao , Dong Chao
Published: June 2013

The thin-walled components of aero industries in general have complex structures whose machining accuracy is very difficult to be guaranteed because of the weak rigidness. To resolve the problem of the thin-walled disc clamping deformation, one novel clamping approach with flexible clamping capability is proposed in this paper. The surface morphology measuring systems (SMMS) and fast servo cutting system (FSCS) are developed, and its microstructure morphology duplicating accuracy is experimentally proved to be about 1μm under working environment. The clamping deformation is clarified weaker via flexible clamping approach which makes thin-walled disc morphology uniformly adaptive to the clamp.
Modeling Aspects of Sound Speed in Air for Ultrasonic Industrial Applications
Authors: Nicolau Viorel
Published: June 2013

In general, the sound speed in air depends on the air characteristics, such as temperature, pressure, humidity, gas composition, and air turbulence. It has direct influence on performance of ultrasonic sensing applications, like those based on the distance measuring and the sound wavelength. For many industrial applications, the sound speed in air is considered as constant, but this is true only for constant environment properties, like indoor environments with air-conditioning systems. Even then, the speed of sound can have different constant values for different sets of environment properties, generated by their spatial or temporal variations. For outdoor environments, the supposition of constant sound speed can generate important errors of distance estimation, In addition, for low temperature values, the real distance to an object is smaller than measured distance by ultrasonic sensing, and this can be a dangerous situation. Hence, simple and accurate models of sound speed in air are very important for ultrasonic industrial applications. In this paper, models of sound speed in air are studied, and new models are proposed, which are capable of dealing with uncertainties generated by unknown air characteristics. In addition, expert rules for model selection are generated, and comparative simulation results are presented.
The Energy Consumption Investigation of the Hotel Central Air-Conditioning System and the Research of Energy Saving Measures
Authors: Ni Jia Jia , Tao Li , Wang Yi Jun , Wu Jin Lei
Published: June 2013

Through to investigation on present situation of the Changzhou Changrui Hotel air conditioning system energy consumption, by analysis the energy consumption, the power consumption of hotel central air-conditioning system charge 58% of the total electric, accounted for a large proportion. So we should take the necessary measures to reduce the expenses of air conditioning system energy consumption. According to the analysis of data on the survey, we put forward some particular energy-saving measures of central air-conditioning system of the hotel, including strengthening the building envelope insulation, energy saving technology of doors and windows, measures of roof energy saving, setting reasonable indoor temperature, adopting frequency control air-conditioning, reuse waste heat of the central air-conditioning, using the condensation water of central air conditioning to make-up water and reducing temperature of cooling tower , and drying the fresh air independently.
Numerical Study on High Prandtl Number Liquid Bridge
Authors: Liang Ru Quan , Yang Shuo , Yan Fu Sheng , Ji Jun Hong , He Ji Cheng
Published: June 2013

The overall numerical analysis of liquid bridge for high Pr number fluid and flow field of ambient air under the zero-gravity environment was carried out in the present paper. The paper used level set method of mass conservation to capture two phase interfaces. Not only the free surface deformation was considered, but also the effect of ambient gas was taken into account. Simultaneously, results of stream function in liquid bridge and ambient gas-phase were given.
Error Analysis of Modification Gear Generated by Grinding Worm Wheel
Authors: Yang Jian Jun , Wang Jian Jun
Published: June 2013

In the process of gear grinding, the grinding worm profile was modified with the wear of grinding worm, which has an important influence on machining accuracy. In this paper, the profile of grinding worm was calculated and simulated according to the tooth contact analysis. The profile error was analyzed according to the outer diameter of grinding worm. With the wear of grinding worm from outer diameter 400mm to 380mm, the grinding worm profile was recalculated after being redressed to ensure grinding accuracy.
A Three Phases Z-Source Inverter Topology
Authors: Shi Ji Ying , Dong Shuang , Liu Wen An
Published: June 2013

Now Z-Source inverter is replacing traditional inverter and becoming a research focus. But traditional Z-source inverters bring high voltage stress both in DC input and the Z-source network, which restricts its wide application. In order to solve this problem, a new type Z-source structure with third harmonic injection control strategy is proposed in this paper. The principle and operation models are analyzed. Compared with traditional boost-type Z-Source topologies, the proposed topology offers lower voltage stress, whats more, soft-start strategy can be implemented to suppress the inrush surge arising in the start process. Finally, simulation results demonstrate the good performance of the proposed inverter.
Modeling and Control of the Voltage Source Converter
Authors: Wang Gang , Sun Zhuo Xin , Zhu Yu
Published: June 2013

The elementary structure and operation principle of the VSC are introduced. Detailed analysis of the PWM control principle and the steady-state mathematical model. And a steady-state controller design scheme based on the PID control principle is also proposed. The simulation results show that the method have good control ability, quick response to breakdown and good stability.
WSN Collaborative Target Tracking Based on Dynamic Clustering
Authors: Hu Bing , He Ning Hui
Published: June 2013

The paper puts forward an algorithm base on the strategy of sensor nodes dynamic clustering which also combined the method of particle filter to track the target. The simulation shows that the algorithm efficiently reduces the amount of communication between the redundant nodes and sensor nodes, decreases the energy consumption of the entire network, extends the network life span and improves the tracking accuracy.
Design and Implementation a Testing Environment for Wireless Sensor Networks
Authors: Fan Zhang , Yang Dong Yu , Jun Lin , Yang Chun Hui
Published: June 2013

This paper discusses the design, implementation and analysis of a system analysis for wireless sensor network. Current testing systems have low efficiency on software environment. We proposed a service oriented software approach, and gave out an experimental analysis of reliability. The testing system greatly decreases the development workload on server. Experiment reveals that the result of reliability analysis is accurate and the testing system is effective.
An Improved Faults Diagnosis Strategy of Analog Circuit Online Using Kernel Fuzzy C-Means for the Unknown Fault
Authors: Qin Peng Da , Qin Yu Ping , Zhang Ai Hua
Published: June 2013

To solve the unknown faults diagnosis online for analog circuit, a novel faults diagnosis strategy based on improved kernel fuzzy c-means (IKFCM) is proposed. simultaneously, the high-performance recognition tree structure of the improved kernel fuzzy c-means itself can decrease the train sample and eliminate wild value, the training speed and precision of classifier can be done well in this way. The realizing of precision fault diagnosis, firstly, via confirming exact class centers from the data of known faults, and then the mean value can be obtained relying on the faults data of each class, meanwhile, setting this mean values as the thresholds for judging faults and each data point is issued with a class label. During the whole faults diagnosis, each detection data will be compared with the thresholds, the high similarity detection data will be fall into the known faults classes while the low similarity detection data will be labeled as unknown faults. Simulation proved the well performance effectively of the proposed IKFCM method .
Analysis of Uncertainty in Standard Metal Tank Volume Verification with Monte Carlo Method
Authors: Li Jin Hai , Tong Ru Song , Cao Suo Sheng
Published: June 2013

The uncertainty in standard metal tank volume value verification is evaluated by using Monte Carlo Method. For second standard metal tank, verification is conducted with volume comparison method. A mathematical model of second standard metal tank volume measurement is established by using first standard metal tank to measure second standard metal tank. An analog simulation is conducted for verification value by using Monte Carlo simulation method, and hence the uncertainty in volume verification is obtained. Through comparison between evaluation result and traditional uncertainty propagation evaluation method, the result indicates that the difference cannot be ignored and the evaluation result by using Monte Carlo Simulation Method is more reliable.
Review on Meteorological Detector in Highway Mechanical and Electrical Engineering
Authors: Jia Xu , Ding Wei Zhi
Published: June 2013

Meteorological data collection and monitoring is widely adopted in the traffic industry. Meteorological monitoring can ensure traffic safety and improve the traffic management level. According to the detection type the system is divided into several types: pavement visibility detector, road conditions detector, rainfall detector, wind speed and direction detector, etc. Subsequently the advantages and drawbacks or system working principle of various types are compared. Meanwhile the key issues and the future trend of development are presented.
Overview of Ultrasound Imaging Algorithms Based on Synthetic Aperture Focusing Technique
Authors: Sun Hong Chun , Zhang Da Long , Wu Shao Kun
Published: June 2013

Synthetic aperture focusing ultrasound imaging technique used signal processing method to analysis ultrasonic echo data. It let the performance of transducer with small apertures be as well as the transducer with large aperture. It can still obtain high azimuth resolution image and form three-dimensional image, when it was operated at lower operating frequency. This paper describes the history and the theory of synthetic aperture focusing ultrasound imaging technology. It also contains the development of the synthetic aperture focusing ultrasound imaging technology in China and at abroad. And lots of excellent synthetic aperture focusing ultrasound imaging algorithms were listed in this paper. We analyzed the deficiencies and problems of the existing ultrasound focusing algorithms. And we made forecast about the development of synthetic aperture technology in nondestructive testing.
Equipment/System Safety Design Process in Civil Aircraft Considering Structure-Support Requirements
Authors: Shen Wei Guo , Han Jun Wei , Zhao Xin Tong
Published: June 2013

For safety-designing an equipment/system in civil aircraft, ARP4761 & SAE ARP 4754 is important common standard. But in these standards there has no clear description aircraft structures effect on the equipment/system. In this present paper, aircraft structures effect on design an equipment/system is considered by methods of FHA-FMEA-FTA-SSA quantitatively by conservative assumption. A flow chart of requirement considering structure-support effect is developed.
Comparing Study on Performance of Brushless Doubly-Fed Generator with Different Rotor Structures
Authors: Yue Zhang , Wang Feng Xiang
Published: June 2013

In order to study comparatively the effect of different rotor structure on variable speed constant frequency generation. The simulation performance comparisons between ALA reluctance rotor and cage rotor generator are presented in this paper by MATLAB software. It is indicated that ALA reluctance rotor and cage rotor exhibits fine variable speed constant frequency generation, however, the voltage harmonic of reluctance rotor generator is more than that of cage rotor generator.
Study of the Fuel Consumption of ECMS Applied to a HEV
Authors: Sun Ping , Yu Xiu Min , Dong Wei , He Ling
Published: June 2013

Hybrid electric vehicle (HEV) is integrated with the engine, the motor and the battery and so on. HEV has a significantly better fuel efficiency compared with conventional vehicles due to its multiple power sources. To evaluate fuel economy, HEV and its subsystem modeling methodologies were provided through the analysis of energy flow. The Equivalent Consumption Minimization Strategy (ECMS) was built based on the prototype. The ECMS implementation analytical formulation was developed. The equivalency factor, one for charging and the other for discharging, each of them was different during a driving cycle. In a certain drive, only a subset of them generates a trend close to zero, which indicates charge-sustainability.
Study on the Intelligent Control Technology for Wet Dual Clutch Transmission
Authors: Han Peng , Cheng Xiu Sheng , Song Yong Dao , Wang Yin Shu , Liu Xi
Published: June 2013

An intelligent control system of wet dual clutch transmission was presented in this paper,and an intelligent control arithmetic based on neural adaptive PSD was established to realize precise control of clutch pressure.The transfer characteristics of clutch torque were analyzed,and the clutch torque model was established Due to the characteristic of the clutch control valve,the clutch pressure was precisely controlled in the neural adaptive PSD controller. The shift tests showed that the intelligent control arithmetic based on neural adaptive PSD had good adaptive ability,which could meet the control requirements of wet dual clutch transmission.
Analysis for Extinction Capability of Carbon Nanofibers by Moment Method
Authors: Wang Hong Xia , Zhang Qing Hua , Sun Hong Hui
Published: June 2013

Carbon nanofibers is a new kind of electromagnetic wave absorbing materials and it is expected as a new kind of smoke interference agent. To study the scattering and extinction characteristics of carbon nanofibers, the electromagnetic scattering calculating model was established, and the induced current equation was solved by moment method, as well as the relationship between the infrared extinction cross section and the length of carbon nanofibers was analyzed and calculated based on MATLAB. The results show that when the conductivity of carbon nanofibers is large, the extinction cross section appears a series of resonant peaks along with the length change, and when the length of carbon nanofibers is equal to the first resonant length, the extinction cross section of unit volume will reach the maximum value, and a good extinction effect can be achieved at the same time. The contribution of scattering to extinction is enhanced with the increase of electrical conductivity.
1×6 Compound-Driven Optical MEMS Device for Multifunctional Fiber Optic Communication
Authors: Chen Ying Jun , Li Yan Mei , Chen Qing Hua , Wu Wen Gang
Published: June 2013

A 1×6 compound-driven MEMS-based optical device with optical switch and variable optical power attenuating functions has been proposed to optimally serve multifunctional optical fiber-based networking applications. The device manipulates the light with binary-slope mirrors driven by compound electrostatic actuator. The optical models for attenuating are investigated. Performances of the fabricated devices assembled with ball-lensed fibers are measured and discussed. Measurements reveal that the insertion loss of the device is less than 2.7 dB and the controllable attenuation range is more than 40 dB for the switching and attenuation function, respectively.
Study on the Architecture and Motion Control of the Traverse Robot
Authors: Wu Jun Hui , Qin Tong Di , Chen Jie , Lin Kai Yan , Si Hui Ping , Zhang Chi Bin
Published: June 2013

In order to keep the problem of robot obstacle avoidance and the traversal motion control simple, the performance and characteristics of the traverse robot are described firstly, followed the architecture of horizontal and vertical was adopted, and the traversal robots based on hybrid architecture was designed independently, also, the architecture met the performance needs of the traverse robot. Then the kinematic model of the robot was created and analyzed, and the motion control strategy based on the traversal robot was obtained. The strategy not only simplified the movement of the traversal robot, but it also completed the different methods of obstacle avoidance, which ensure the efficiency and reliability of the overall running of traversal robots.