bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Studying on Rock of HeLanKou Deformation and Failure Characteristics under Triaxial Compression Test
Authors: Yang You Zhen , Guo Zi Fan , Ma Han Lin
Published: December 2014

The deformation and failure characteristics of rock have a decisive influence on the value of the heritage itself. Therefore, the rock samples were taken from the HeLanKou rock paintings area. The triaxial compression test was completed with the multi-function apparatus RMT-150C. Then the deformation and failure analysis were analyzed. The results show that the porosity and water imbibition are all low. The triaxial compression strength is high. The rock belongs to brittle material. The results can provide data support and reference for HeLanKou rock paintings protection.
Study on the Improvement of Legal Systems for the Use of Subway Station during Disasters
Authors: Kim Eun Young , Hwang Eun Kyoung , Lim Seok Ho
Published: December 2014

Our country is facing special circumstances as it is now a divided nation. People are allowed to evacuate to adjacent public facilities within residential areas in the case of emergency. In particular, the main facilities of subway stations are facilities designed for the convenience of passengers so they have emergency shelter conditions. However, the legal system for the use of subway stations as temporary shelters during disasters has yet to be instituted. As a result, the consistent application of the system is difficult. The lack of correlation between the relevant laws also makes it difficult to prepare shelters quickly during an emergency. The role of relevant departments and the scope of disaster recovery may vary depending on the relevant laws. In this study, the improvement criteria were divided into four based on findings regarding the problems identified in existing standards. In conclusion, this study focuses on suggesting improvement schemes with respect to the coverage of victims, area criteria, equipment criteria, and disaster relief goods.
Load Effects Analysis and Safety Evaluation of High-Pile Pier Slideway Structure while Large Platform Dragged Horizontally to Move to Barge
Authors: Liu Hong Biao , Zhang Qiang , Liu Xian Peng
Published: December 2014

The bearing capacity calculation in horizontal and safety assessment methods of high-pile pier slideway while large platform dragged horizontally to move to barge was studied based on the theoretic derivation and numerical simulation method. According to the research, the load effect of 6000ton slideway in the process of large platform dragged horizontally is obtained, the safety of slideway is evaluated, and the safety measures of slideway structure which should be taken during dragging platform are recommended. The results of the calculation and analysis show that the bearing capacity of slideway meet the requirements of design under the horizontal load of 11550kN by using uniform force to calculate, and the displacement is less than the width of the structure gap between two segments. The 6000ton sildeway is safe under horizontal load of 11550kN. These conclusions can provide the basis for the safety state analysis of high-pile pier slideway structure and the optimization of plan to move the large platform to load on barge.
Fluid-Structure Interaction Analysis of Layered Water Intake Structure Considering Load Changes
Authors: Zhou Min Zhe , Li Tong Chun , Ding Yuan , Zhou Xiao Chun
Published: December 2014

Coupled vibration of water and stop log gate in the layered water intake structure will occur under the condition of the sudden load changes. A fluid-structure interaction (FSI) finite element model of the layered water intake structure of a hydropower station was established by using the finite element software ADINA to simulate the process of power on and off and the FSI phenomena of stop log gate during each process, and also verify the security of the scheme. The results show that fluid-structure interaction has a significant impact on the running of the layered water intake.
Rheological Characteristics of Unsaturated Soil under Confined Compression Condition
Authors: Tian Guan Feng , Ma Hong Wei , Wu Qi Xing
Published: December 2014

Based on the results of confined rheological compression test of unsaturated soil samples, some important characteristics and its effective factors have been discussed by using three-dimensional model. At first, the curves of lateral stress relaxation show the process of correspondence with vertical creep. Secondly, it is lateral total stress, and not effective stress, that is relaxed with time because of the volume viscidity of pore water and the shear viscidity of soil skeleton. At last, the limited steady rheological state of soil is controlled by stress strength.
Finite Element Analysis of Ship Lock Chamber Structure
Authors: Sun Chao , Guan Zi Chang Shang , Wang Xiao Xuan
Published: December 2014

While considering various structural and material requirements, 3D models of ship chambers in the ship lock structure using finite element modeling (FEM) software ANSYS. By using FEM software to set up the contacting sections between the base plate, refilled soils and foundation, analyses were done to caluculate the forces exerted on the structure of the ship chamber. After checking the reasonability of the calculated results, discussions were made on the calculation process to allow for future empirical calculations.
On Dredging Renovation of High-Piled Wharf by FEA
Authors: Liu Zhi Hui , He Liang De , He Ying Fa , Lu Yuan Yuan
Published: December 2014

In this paper, high-piled wharf is reinforced with a view to studying how the wharf dredging renovation affects its structure. As regarding the problem that the original balance of the bank slope is destroyed after upgrading, two retrofit schemes that set sheet pile wall at anterior wharf and low-piled caps at surcharge area are conducted to analyze the bank slope deformation and the inter force before and after wharf retrofit by means of three-dimensional finite element models. The analysis shows that for the scheme of setting sheet pile wall at front wharf, the inter force of the anterior pile station reduced while that of the post pile station near the stack area remains large. For the other scheme, the bending moment of the pile that closes to stack area significantly decreases after setting low pile caps. If both schemes are adopted coherently, the reinforcement effects to the anterior and post pile stations would be improved greatly.
Study on Karst Features and its Influence on the Project of Wudongde Hydropower Station of Jinsha River
Authors: Wang Tuan Le , Ye Sheng Sheng , Hao Wen Zhong , Liu Chong Ping
Published: December 2014

Wudongde canyon where the hydropower station will be built is deeply cut by the river with the height of more than 800m. Three type of rocks (sedimentary, metamorphic and volcanic rocks) outcrop at the project area. The complexity of the lithology of the Mesoproterozoic Huili Group Luoxue Formation (the limestone, marble, dolomite, marble lithification dolomite, quartzite and phyllite parallel to each other) combined with the complexity metamorphic process (including marble lithification, dolomization and sericitization) and the multiphase tectonic movement and multiphase transgressive period and regressive period formed the Wudongde canyon unique hydro-geological structures. The complexity of the geological conditions (complex lithology, tectonic structures, Neotectonics movement) combined with the dry-hot canyon meteorological conditions formed the complexity of the Wudongde caynon Karst features. The different karst types have developed such as the karst fissures, karst holes, horizontal caves and karst oblique caves. Based on the detailed geological data, the karst and hydro-geology features and the karst controlling factors have been systematically analyzed, meanwhile the karst influence on the project have been evaluated and the suggested measures have been taken to avoid the disadvantage conditions. The experience of Wudongde Hydropower station karst research can be as reference for other similar projects.
Airport Runway Debris Edge Detection Algorithm
Authors: Guo Yan Ying , Liu Zhi Gang
Published: December 2014

Airport runway debris detection decides security of plane and passengers. The relative merits of the various types of sensor and the effects of adverse environmental conditions on their performance, a novel fuzzy weighted morphology algorithm of detection about runway debris is approved. The experimental results show that the proposed algorithm, compared with a few classic algorithms of edge detection, which can achieves the image edge precisely and reduce noises, better retain the image details, and adaptively detect the complete and successive edges.
Study on the Temperature Distribution Law of Thermoelastic Coupling Field in Concrete Pavement under Tunnel Fire
Authors: Ren Zhong Shan , Wang Wo , Zhang Lei , Lin Xiong , Peng Pan
Published: December 2014

Much research work about tunnel fire focused on a single temperature field of tunnel lining structures, and ignored the thermoelastic coupling effects in concrete pavement. Normally, the simplified heating curve sush as the environment temperature curve was adopted, therefore, a mathematical model of the thermoelastic coupling field was established based on finite element method, and the solving algorithm using finite difference method was proposed to analyze tunnel fire problem. Moreover, the results by the above method was also compared to those without considering thermoelastic coupling effects. In addition, the influences of material parameters, such as heat conductivity coefficient, specific heat capacity, elastic modulus and so on, were studied respectively to give the sensitivity of the problem. Through this research, the following conclusions were obtained: the thermoelastic coupling has a certain impact on the temperature field, and it appears the hysteresis phenomenon along the depth direction. Furthermore, when considering the thermoelastic coupling, the temperature of tunnel pavement under fire decreases with the increment of each material parameter respectively, i.e. all the material parameters have similar effects on the temperature field.
The Research of the Governance of Instability Retaining Wall
Authors: Qiu Gang , Ge Xin Sheng
Published: December 2014

According to retaining walls of joint construction buildings and office building of the mine of three yuan weizi town, outdoor pavement reinforcement of engineering practice, introduced the design parameters and construction process of the high-pressure jet grouting pile, soil nail wall and drilling grouting, the results showed that reinforcement scheme is reasonable and feasible, there is reference to other similar projects.
Dynamic Behavior of Cable-Stayed Bridge under Moving Vehicle and Train
Authors: Park Yong Myung , Kang Ji Hoon , Cho Sung Hun , Kim Hee Soon
Published: December 2014

In this study, dynamic behavior of cable-stayed bridge under moving vehicle and train was analyzed. The parameters considered are the main span length of bridge and the existence of intermediate pier at side span. For the parametric analysis, cable-stayed bridges with 400m and 700m main span (with and without the intermediate pier at side span) were selected. From the vehicle/train-bridge interaction analysis, the intermediate pier was found very effective to reduce the dynamic amplification of girder and stay-cables.
Preliminary Investigation of Influence of Special Testing on Bridge Structure Durability
Authors: Hu Chun Hua , Zhu Qiao , Ma Xiao Zhou , Yu Fang
Published: December 2014

Based on bridges routine examination, special detection is in-depth and meticulous testing that according to the disease characteristics, using some expertise technology and testing equipment for steel corrosion, concrete carbonization, the thickness of the protective layer and component quality to some key parts or typical bridge opening. Bridge condition of technology can be controlled more fully and accurately through a special bridge inspection, combined with conventional test results on the status of a comprehensive assessment of structures. This may provide technical data for the next bridge inspection count and load test, moreover, according to the variation of the data in the field test, it may dedicate variation characteristic and influencing factors for damage of structural durability from these special detections.
Detection and Analysis of Bridge Load Test
Authors: Wang Gui Bing , Liu Yong
Published: December 2014

There are many bridge in our country, the new bridge has been built and numerous. Accurately and efficiently assess the bridge state to determine its carrying capacity and reliability level of great social and economic significance. Bridge load test can be directly measured structural properties of the bridge to provide a basis for the evaluation index maintenance of the bridge structure. Currently, the basic architecture using load bearing capacity performance test results assessed the bridge has been established, but many details are still unresolved issues still need to be further expanded research to accurately determine the fine actual carrying capacity of the bridge.
Experimental Research on the Prestress and Static Behavior of a Cable-Strut Tensile Structure Model
Authors: Fu Lin , Chen Lian Meng , Wu Bin , Zhang Zi Hao , Ye Xi Guo , Zhou Yi Yi
Published: December 2014

A cable-strut tensile structure model with the diameter of 5.0m was designed and made to study the prestress and static behavior on the base of theory analysis. New schemes of the boundary compression ring, the cables and struts with the adjustable length, the connection nodes were designed and the least square method to fit the element force and strain curve was proposed. The initial prestress distribution and the responses of the model under full-span node load, half-span node load and 1/4-span node load were investigated. The experimental results indicate the cable-strut tensile structure will achieve the designed initial prestress while every element was tensioned to designed length. The outer planar stiffness of the structure is poor and easy to lost stability when subjected to asymmetric loads. The measured values and computed ones are almost consistent, which indicates the validity of the model design and the accuracy of the proposed methods.
Numerical Simulation Analysis of Bearing Performance of Extra-Long and Large-Diameter Single Pile
Authors: Zhao Zhi Meng , Chai Jin Yi , Fan Cai Xia
Published: December 2014

The effects of pile diameter, the property of pile end bearing stratum, the material parameters of pile shaft and the changes of pile length on the bearing performance of extra-long and large-diameter single pile were examined with the finite element software ABAQUS to make the numerical simulation analysis, by establishing the overall axial symmetry model, which was based on the data of static load test of single pile at the Yellow River Bridge site. The results show that the ultimate bearing capacity of single pile, the stiffness and the end resistance ratio would increase gradually, whereas the compression settlement ratio decreases slowly; the pile end grouting can significantly increase the ultimate loads, and therefore, improve the bearing performance of piles, but it has little effect on the stiffness of pile when loading was smaller; the elastic modulus of pile shaft has no effect on the ultimate bearing capacity of friction piles, little on the end resistance ratio, while the pile compression settlement ratio would gradually decrease and the stiffness would increased with the increase of the elastic modulus of pile shaft, and this increase of stiffness would slow down with the increase of elastic modulus of pile shaft; it is unreasonable to improve the ultimate bearing capacity of extra-long single pile only by means of increasing the pile length.
Insulation Optimization of ±1000kV DC Wall Bushing
Authors: Li Hong Wei , Pan Zhi Yuan , Wang Jing , Dong Pan Ting
Published: December 2014

±UHV (Ultra-high voltage) DC (direct current) wall bushing is an important equipment of UHV DC transmission system. It plays a key role in the economic transfer, flexible allocation and safe usage of power. In this paper, the methods of improving the electric field distribution and insulation construction optimization are explored. The choice of insulation materials is discussed. Some calculations are made about how to optimize and design the capacitor core and how to optimize the parameters of grading rings. The research results would provide useful reference for further design and development of UHV DC wall bushings.
Power Transformers Health Index Calculation Method Based on Cloud Model and Fuzzy Evidential Reasoning
Authors: Cai De Hua , Yang Xi , Wang Rui Chuang , Ma Cheng Zhi , Cheng Jin , Zhang Xiao Long
Published: December 2014

Transformers health index calculation method based on cloud model and fuzzy evidential reasoning is proposed. According to the multi-level and multifactor of evaluation index information of power transformers, a layered evaluation index model is established. In order to deal with the ambiguity and uncertainty information of evaluation index, a normal cloud model is introduced, inferred the fuzzy degree of belief in the health state of evaluation index. Then use the fuzzy evidential reasoning method merge information of evaluation Index, inferred the degree of belief in the health state-level of transformer, calculated the health index of transformer. The results of an example analysis test its rationality and effectiveness.
Testing and Diagnosis of Extra High Voltage Power Cables Using Damped AC Voltages Combined with Distributed Partial Discharge Measurement
Authors: Yan Biao , Zhou Li , Chen Jie , Tao Feng Bo , Zhang Jian
Published: December 2014

State assessment method of cables with extruded insulation and their accessories, DAC withstand test combined with a diagnostic test (such as PD measurement) has two shortcomings, the output voltage is not high enough for EHV cables, it cannot detect and locate PD effectively when defects are far away from signal acquisition point. This paper focus on DAC voltages up to 250kV and a kind of distributed measurement of PD. Defects existing in arbitrary of tested cable can be accurately measured in theory by installing sensor at intervals along the tested cable. This method has been validated on a long extra high voltage cross-linked polyethylene (XLPE) insulated underground cable circuit and the filed PD test has been completed successfully.
Biodiesel Production from Waste Cooking Oils by Using Immobilized Microorganisms as Whole Cell Catalysts
Authors: Zhou Gui Xiong , Chen Guan Yi , Yan Bei Bei
Published: December 2014

The main hurdle to the commercialization of lipase-catalyzed production of biodiesel is the cost of enzyme and feedstock oil. In order to reduce the cost of biodiesel production, the lipase-producing whole cells ofAspergillus nigerand immobilized onto biomass support particles (BSPs) were used for the production of biodiesel from waste cooking oil. This article studies this technological process, focusing on optimization of several process parameters, including the water content, catalyst loading and molar ratio of methanol to waste cooking oil. The results indicate that the water content of 20%(based on oil weight), BSPs-immobilized cell catalysts of 6% and methanol/oil molar ratio of 4:1 are the optimum conditions for biodiesel production from waste cooking oil. Under the optimum conditions, the maximum methyl ester (ME) content in the reaction mixture reaches 84.7 wt.% after 72 h. In addition, the whole-cell biocatalysts showed excellent reusability, retaining 73% productivity after 6 batches. Our results suggest that whole-cell A. niger immobilized on BSP is a promising biocatalyst for biodiesel production from waste cooking oil.
Research on Error Characteristic of the Protective Current Transformer in High Remanence Environment
Authors: Wei Wei , Zhen Wei , Liu Ming Zhong , Liang Xiao Bin , Chen Cang Yang
Published: December 2014

Electromagnetic Current Transformer (CT) is one of the main equipment in power system, and the remanence in the measuring or protective windings of CT will influence the stability of the power system. Measuring CT is mainly used for the electric energy measurement in normal working condition, focusing on the steady operation state; while protective CT is usually used in fault or short-circuit condition, and the transient transfer characteristic is of significant important. Considering high remanence operation environment in the power system, the numeric analytical model of CT, which is working in the saturation condition, is depicted in this paper. With analyzing the amount of exciting current caused by remanence and deducing the transfer characteristic of CT, the influence of the remanence on the relay protection and the corresponding precautions are proposed, providing accurate and reliable theoretical basis for the protective CT’s correct action and safety operation after system failure. Finally, the electromagnetic transient model of protective CT (TPY) is built in PSCAD, the simulation result of which shows the validity and practicability of the proposed model.
Analysis of the Influence of Magnetic Field on Voltage Error of Three-Phase Three-Element Combined Transformer
Authors: Liu Gang , Jiang Bo , Ren Lin Dong , Lei Guo Ci , Zhang Fu Zhou , Jiang Wei
Published: December 2014

Power systems as 10kV, 35kV and etc have a lot of high-voltage three-phase three-element combined transformer. At present, all of the combined transformers are verified according to single-phase verification method, but the results can’t reflect the true error characteristics of combined transformer. So, it is suggested to adopt three-phase verification method to verify combined transformer. However, when combined transformer is verified according to three-phase verification method, it has not been clear yet that what influence magnetic field generated by current has on voltage error. In this paper, through voltage error test on combined transformer with three-phase verification method at different current, it is discovered that magnetic field has a larger influence on voltage error in the presence of a magnetic field, with the increase of voltage, the influence of magnetic field on voltage error decreased gradually from larger values. The use of three-phase verification method and appropriate modification of current error limits are recommended when combined transformer is verified.
Research on Project Test Tensioning of 1250mm2 Large-Section Conductor
Authors: Hu Chun Hua , Xia Yong Jun , Mei Wen Ming
Published: December 2014

The paper introduces project test tensioning of 1250mm2 large-section conductor and validate structural stability and tensioning characteristics of newly developed 1250mm2 large-section aluminum stranded conductor, reasonability of construction processes and critical construction parameters and applicability of newly developed construction machines and tools to the conductor.
Analysis of Sound Insulation of Substation Barrier
Authors: Pei Chun Ming , Hu Jing Zhu , Liao Qing Fen , Wan Bao Quan , Liang Shan Shan
Published: December 2014

Substation noise pollution as one of the most important environmental problems has been paid more and more attention. A model of substation sound barrier is built in this paper. On the basis of the model, the effects of sound isolation of the barrier with different positions, different heights are analyzed. The setting of the sound barrier that can bring best sound insulation effect will be obtained from the simulation results. Moreover, as the substation control buildings can be seen as barriers, the analysis of the sound barrier attenuation can provide a certain basis for the layout of substation buildings, and the setting of noise reduction barriers for noise controlling.
Study on Optimal Dynamic Braking Resistor of Induction Motor
Authors: Zhu Chang Kai , Dan Shu Heng
Published: December 2014

In order to discuss the transient process of induction motors dynamic braking,analysis the impact of the brake resistance on the time, and then choose the best resistance.In Matlab / Simulink environment,based on motor simulation model,by repeatedly adjusting the rotor resistor, their impact on motor speed during braking time can be visually observed.By using the least squares method in Matlab, each discrete points of the resistor and the corresponding braking time can be fitted into continuous curve, resulting in the optimum braking resistor under the shortest brake time. With the optimum load resistance in the rotor, the motor brake fastest and more stable without fluctuations,and provide the theoretical guidance for other motor control and engineering.
Simulation Analysis of Snubber Circuit for SiC MOSFET Inverter
Authors: Xie Li Jun , Liu Xian Zheng , Li Jin Yuan , Yu Kun Shan
Published: December 2014

SiC MOSFET, as a promising power semiconductor devices, has attracted attention from many laboratories and companies for its super performance in high temperature, high voltage and high frequency applications. To protect the devices from overvoltage induced by parasitic inductance in high frequency applications, snubber circuit is a must. In this paper, simulation of snubber circuit in a high frequency PWM inverter is invested, under different numbers of snubber circuit , parasitic parameters, different kinds of load and whether a SiC SBD exsits. Some useful conclusions are obtained to help design more perfect snubber circuit.
Two-Level Grid-Connected Discharge Inverter System of Power Battery Based on LLC
Authors: Yu Yue , Yin Qiang , Xie Meng Xue , Ren Xiao Dan
Published: December 2014

In order to overcome the large amounts of energy waste in the process of power battery discharge, the two-level grid-connected discharge inverter system of power battery based on LLC is designed. It is composed of LLC resonant full-bridge DC/DC and inverter. The DC-bus voltage is changed and the discharge current is stabilized by adjusting the frequency of the LLC resonant full-bridge DC/DC. The dual-loop control is applied in the inverter system. The stabilization of DC-bus voltage is achieved in the external voltage loop, while the grid-connected is implemented by controlling the grid-connected current in the inner current loop. A prototype is manufactured. The experiment results indicate that it has the characteristics of low harmonic current, high power factor and constant current discharge, and then proves that the inverter system is effective.
Design and Magnetic Field Simulation of Giant Magnetostrictive Bone Conduction Pronunciation Vibrator
Authors: Zhao Zheng Long , He Zhong Bo , Li Dong Wei , Xue Guang Ming , Yang Zhao Shu
Published: December 2014

Giant magnetostrictive material (GMM) has the characteristics of big magneto-mechanical coupling coefficient, enormous strain and broad frequency response, which is widely used in audio and ultrasonic technology, ultra precision machining, testing technology, fluid control, vibration control and all kinds of sensors in recent years. This paper introduces some of the good qualities of GMM, compared with electromagnetic and piezoelectric materials, which are used extensively for bone conduction hearing device at present; a bow type giant magnetostrictive bone conduction pronunciation vibrator with simple structure and reliable performance is designed; the paper focuses on establishing the vibrator model and the simulation of ANSYS electromagnetics model; the radial magnetic field distribution is also analyzed. All the work provides reference for structure optimization and the selection of coupling materials for the vibrator.
Research and Application on Visualization of Discrete Spatial Grid Resource Data
Authors: Li Ji Yuan , Zhong Yi Jun , Zhou Hao
Published: December 2014

In order to optimize the big data management of smart grid construction, analyze and process the extreme weather grid measuring point data of grid operation data which is abundant and discrete with mathematics. Considering of the continuous changing characteristics of weather in effective field of surface, buffer and expand the influential range of grid measuring point, then merge the same data, embellish the data with B-spline curve, store the spatial coordinates in enterprise-class grid resource centre, publish in map with unified service, and show the visual graphical distribution of extreme weather through OGC protocol, realize the visualization of grid resource.
Biomass Energy – Effective Utilization of Crop Straws
Authors: Li Xiao Xia
Published: December 2014

With the rapid development of economy and a large number of energy consumption, the countries all over the world are faced with the depletion of fossil energy resources. Meanwhile, a large number of fossil energy extraction cause geological disasters frequently and the greenhouse effect, which lead to global warming, acid rain and other serious environmental problems. As a representative of the biomass energy, crop straws have advantages of wide distribution, large amount, low price and cleaning, which will be an ideal choice in the future. But it is hard to be efficiently used because of the special structure of crop straws. Through fermentation engineering and gene engineering, people can greatly improve the efficiency of utilization of crop straws, which offers a very promising way to make a breakthrough for energy consumption.
The Research on Commercial Modes of Smart Grid Value-Added Services Based on BSC Theory
Authors: Liu Lin , Hu Bo , Huang Han , Kan Zhi Nan
Published: December 2014

Smart Grid value-added service is an important approach to utilize the potential of smart grid infrastructure. The scientific and rational commercial mode of smart grid value-added service can promote smart grid integrated projects from the pilot to comprehensive application. In this paper, the definition and content of smart grid value-added services commercial mode were studied. According to commercial model theory and evaluation methods, based on balanced scorecard theory, evaluation indicator system was established, evaluation model was proposed based on TOPSIS combined with Delphi and AHP (DAHP-TOPSIS). Through the example of PFTTH (Power fiber to the home) project, the analysis results show that the indicator system and the evaluation model proposed in this paper is useful for the selection of appropriate commercial mode and promote the rapid development of smart grid new services.
Thermodynamic Analysis of Ethanol-Diesel Oil and Waste Heat Recovery for Diesel Engines
Authors: He Ming Yue , Gao Hong Tao , Liu Wang
Published: December 2014

In this paper, for the purpose of providing a scientific reference for saving energy and improving the efficiency of diesel engine, the impact of ethanol diesel-oil alternative fuel and waste heat recovery are investigated on the basis of thermodynamic analysis. The results illustrate that, after using ethanol diesel alternative fuel, engine performance parameters are of no big change, however, the exhaust emissions are significantly reduced; Recycling the energy contained in the exhaust gas and cooling water, can achieve the purpose of energy conservation and emissions reduction, beside improving the thermal efficiency and exergy efficiency of the diesel engine.
Construction and Application of Coordination Scheduling System of Distributed Energy
Authors: Wang Ping , Liu Hu , Liu Yuan Long
Published: December 2014

With the growing renewable resources such as wind and light accessing to grid，the existing regulation and control means face threats and challenges as a result of the change of grid architecture. The distributed energy coordination scheduling system is proposed to use the various resources of intelligent distribution network platform synergistically and complementary. This paper introduces the construction idea，main module and function implement of this system. According to the benefit analysis, this system is proved to improve the reliability and economy of grid operation under the widespread accessing to distributed resources.
Application of Low Low Temperature ESP Technology in Thermal Power Plant
Authors: Fu Yu Yun , Ma Ke
Published: December 2014

With the environmental situation becoming more and more serious, the dust removal technology in thermal power plant needs to be continually improved. Developed in recent years, the low cryogenic ESP technology can not only remove dust and most SO3 in flue gas, but also meet the needs of emission reduction and energy saving in coal-fired power plant, which means it is worthwhile to promote this kind of technology.
Potential Analysis of Demand Response Based on Peak and Valley Time Price
Authors: Liu Li Jing , Liu Ji Chun , Deng Hua Sheng , Li Gang , Sun Yu Le , Liu Jun Yong
Published: December 2014

Tou price is based on the price as the guidance, guiding power users according to their own electricity utilization way of flexibility and interest adjustment behavior to realize the purpose of peak peel and improve the load rate. This paper is on the basis of considering the user satisfaction, using plastic load capacity and power generation side coal saving benefit after two measures of implementing peak valley price demand response potential quantitative analysis, and feasibility of implementing peak valley price for a specific region. At last, a big industrial user in a certain area as an example for analysis, the result shows that the implementation of peak valley price can bring potential benefits, and provide a guide that the feasibility of implementing peak valley price in the region.
Calculation of Electric Field under Overhead Lines with Complex Ground by Two Dimension Surface Charge Method
Authors: Jiang Yu Ze , Liang Zhen Guang , Jiang Di Wen
Published: December 2014

In the paper, influence of complex ground on electric field under overhead lines is studied. Two dimension surface charge method is used and complex ground is modeled with surface charges. Analytical expressions of electric potential and electric field strength produced by surface charge element are deduced. Effectiveness of the method is shown by an example with analytical result. Curve ground and sloping ground are used respectively in calculation of electric field under overhead lines. Results show influence of variation of ground height on distribution of electric field.
Hardware Modification for Watt-Hour-Meter Field Calibrator to Reject Interference of Temperature
Authors: Yang Shi Hai , Lu Shu Feng , Chen Ming Ming , Xu Min Rui
Published: December 2014

Affected by high or low environment temperature, the measurement accuracy of watt-hour-meter field calibrator may decrease significantly. For the purpose of rejecting temperature interference, a hardware modification scheme for the calibrator prototype, adopting the electronic components with better temperature coefficient, is proposed. The testing results show that the improved prototype can meet the 0.05S measuring precision from-30°C to 55°C.
Optimization Control of Engine Working Points Adjustment for HEV Bus
Authors: Kong Zhi Guo , Yu Chao , Tang Zi Ning
Published: December 2014

In order to adjust the working points of the engine for a full hybrid bus, this paper proposed a set of optimization control method. In speed adjustment process, the rate of change was optimized and limited to avoid rapid and frequent change along with power required by the driver. Allow for complex engine model, fuzzy control method was introduced to regulate the torque response rate. Furthermore, dynamic amplitude upper and lower bound were limited to prevent system overshoot and oscillation. Nowadays, there are hundreds of busses operates in several public transport lines. Vast statistic data and experimental results verify the feasibility and effectiveness of the proposed control method in this paper. The vehicle has good fuel economy compared to the counterpart one, and the dynamic performance is also greatly improved.
Establishment and Research of Semi-Physical and Real-Time Simulation Platform for V2G Electric Vehicle Charging System
Authors: Yan Tao , Qu Zhan Zhan , Jia Peng Fei , Hui Dong , Liu Yun Jia
Published: December 2014

Through constructing the battery system of electric vehicle, real-time simulation model of V2G charging converter topology, and combined with material object of hardware and software of V2G charger controller, establishing semi-physical simulation platform for V2G electric vehicle charging system based on RT-LAB real-time systems, which making use of real-time simulation platform to research the control mechanism of charger controller. The experimental results show that: the constructed semi-physical simulation platform is running well, its simulation results of charging and discharging process is relatively consistent with the actual output of V2G charging equipment, it can be used to verify the developed adjustment mechanism of V2G charger and the charging and discharging process of a variety of electric vehicle battery system, provides an ideal semi-physical simulation platform for the verification of the control strategy of electric vehicle V2G charger.
Study on Charging Business Operation Model of Electric Vehicle
Authors: Huang Li , Yang Yong Biao , Pan Ben Ren , Gao Hui , Wang Dong , Jiang Xiao Yu
Published: December 2014

For the bottleneck of electric vehicle short range and energy supply inconvenience to restrain the fast development of electric vehicle, from the perspective of the electric vehicle power charging model, through analyzing the current situation and developing trend of electric vehicle charging facilities, consulting the existing electric vehicle charging model of advice, and borrowing from the mature business operation model of other domestic industry, one kind of proposal of suitable for the domestic electric vehicle current situation of power supply mode is analyzed. The proposal can provide reference for domestic electric vehicle scale and rapid development.
“Source to Source” Active Coordinated Control Technique Based on Large-Scale Wind Power Connecting to the Grid
Authors: Fu Xi Wei , Liu Wen Ying , Wang Wei Zhou , Xia Peng
Published: December 2014

Currently, the problem of energy crisis and environmental deterioration on the world is extremely urgent, so people now are trying to turn to many kinds of renewable energy to solve these problems. Of these renewable energies, because of its cleanness and availability, wind power has broadened prospect and in recent years, it is considered to connect wind power to the grid in large quantities to make full use of it. However, wind power possesses the shortcoming such as randomness so that when it is connected to the grid, it may have great impact to the grid and damage the balance of the power system. Based on the fluctuation regularity of load and the characteristics of volatility, intermittent and randomness of wind power, the operation characteristics when large-scale wind power is connected to the grid and active regulation characteristics of conventional power source such as fire power, the multi time-scale “source to source” active coordinated control technique is proposed.
Model for Leakage Fault Diagnosis of Pipe Network of Hot-Water District Heating
Authors: Guo Min , Zhou Shou Jun
Published: December 2014

In order to decrease leakage faults and improve efficiency of fault detection for pipe network in hot-water district heating, this study proposed a model for hydraulic-condition of node leakage based on the network graph theory. This mathematical model can be utilized to simulate and predict node leakage condition through plane topology of heating network. For fixed pump head of the simulated sample network, some aspects of hydraulic-condition are discussed, including various leakage nodes and flow rate at supply and return run-out. Simulation results denote that both users’ pressure and flow decrease for the supply run-out leak while results are opposite if return run-out leaks. For users located before leakage node, the nearer to the leakage node, the greater they are influenced. However, users behind the leakage node change in the same way and more than the former.
Thermal Analysis and Design Applications of the Spiral Groove Tubes in Condensers
Authors: Wang Xiao Lu , Huang Da Yu
Published: December 2014

In this paper, condensation mechanism of the Freon refrigerants outside spiral grooved tube is discussed. The heat transfer coefficient of Freon refrigerants condensation outside spiral grooved tube is obtained. A calculation example of heat transfer coefficient on the tube bundle of condenser with baffle bars is presented. It shows the excellent thermal performance of the spiral groove tubes compared to smooth tubes.
Discussions on the Methods of Preventing Heat Transfer Fluids from Oxidation in Open Heating System Based on Liquid-Phase Organic Heat Transfer Fluids Heater
Authors: Kou Guang Xiao , Lu Rong Rong , Yang Jing Hua , Cai Ling Ling , Shang Pei Na
Published: December 2014

Introduces the technological process of the open heating system with a liquid-phase organic heat transfer fluids heater by analyzing the advantages and disadvantages of preventing heat transfer fluids from oxidation based on expansion pipe with cooling water casing. And it presents two methods to prevent heat transfer fluids from oxidation by arranging directly cooling coils or pulsating heat pipes in the expansion tank; it also provides the schematic diagram of those methods as well as comparatively analyzes their advantages and disadvantages.
Research and Develop on Series of Cryogenic Methanol Coil-Wound Heat Exchanger
Authors: Zhang Zhou Wei , Wang Ya Hong , Xue Jia Xing
Published: December 2014

A series of cryogenic methanol coil-wound heat exchangers with multi-stream and multiphase flows were researched and developed, including methanol-methanol cooler, cryogenic recycle methanol cooler, unshifted gas cooler, shifted gas cooler, feed gas cooler etc. The winding structure characteristics and the work principle of the spiral pipe bundles were elaborated to help the scientific design and calculation of coil-wound heat exchanger in cryogenic methanol field and to promote the research and development of standardization process. The major research directions and the critical scientific problems were forecasted.
Heat Balance of Extinguishing Process of Flammable Liquid by Sprayed Water
Authors: Korolchenko Dmitry A. , Sharovarnikov Alexander F.
Published: December 2014

This article considers two alternate solutions of a thermal balance equation. The first solution allows us to trace the decrease of a flammable liquid surface temperature to a temperature lower than fuel flash point at which combustion is stopped. And the second solution allows us to analyze the decrease of burnout rate to a negligible value at which steam-air mixture becomes nonflammable.
Study on the Effects of Coal Base Fuels on Diesel Engine Performance
Authors: Wang Xu Dong , Xiong Chun Hua , Lu Chang Bo , Wang Feng , Wang Gang , Liu Feng Chun
Published: December 2014

This paper addresses the physicochemical characteristics of petroleum based diesel, coal based diesel and blended diesel (volume ratio of petroleum based diesel and coal based diesel 1:1), the power performance, fuel economy and exhaust emission with the three kinds of fuel were investigated on an engine test bench. The results show that: without any change in the diesel engine, when the engine fueled with coal based diesel power slightly upgraded, fuel consumption rate change little, exhaust smoke decrease obviously compared with using petroleum based diesel, that means coal based diesel is a kind of low-pollution alternative fuel for diesel engine.
Study on the Stress Distribution of the Piston Rod Fillet Based on the Nonlinear Finite Element Method
Authors: Wang Xiao Yu
Published: December 2014

Because of discontinuity of the shape, the piston rod of rapping device is liable to occur stress concentration phenomenon, leading to fracture of the piston rod. At work, the maximum stress of piston rod which took place in the cross section of the geometric mutations varied with the change of the fillet radius, under the same load, it analyzed the influence of different fillet radius on fracture of the piston rod via ANSYS/LS-DYNA finite element. The results showed that it can meet the requirements when the fillet radius was 5 mm.
Wind Turbine Planetary Gearbox Fault Analysis Based on Bispectrum
Authors: Feng Yong Xin , Zhang Wei Peng , Yang Tao , Deng Xiao Wen , Liu Shi
Published: December 2014

Through researching the fault vibration signal characteristics of planetary gearbox, various forms of quadratic phase coupling phenomenon were found in the signals. Bispectrum has properties such as detecting the quadratic coupling phenomena and restraining gaussian noise signal, and it can be well used in the planetary gearbox fault diagnosis. Meanwhile, the sun gear distributed fault (gear wear) and partial fault (root crack, partial broken teeth) are simulated in the wind turbine test bench built in the laboratory. By analyzing the structure characteristics of its frequency through bispectrum, the fault of the gear is effectively diagnosed.
Modeling and Simulation of Ship Generator Sets
Authors: Xiang Dong , Xiong Hao , Liu Ning Bo , Wu Qiang , Meng Guang Wei
Published: December 2014

This paper establishes the mathematical models of the ship generator sets, including the diesel, speed governor system, synchronous generator, excitation system and static load, simulates the ship generator sets by Matlab/Simulink software, and tests the performance of each system to verify effectiveness of the models. The simulation results indicate that the whole system model meets technical requirements of military standard GJB.
Dynamic Response Analysis of Stop Log Gates in Power Station’s Running Process
Authors: Zhou Min Zhe , Li Tong Chun , Ding Yuan , Guo Yun
Published: December 2014

In this paper, a 3-D finite element model was established for stop log gates. It is used for researching its force situation in process of power on and power off. The vertical pressure distribution around stop log gates shows that with water depth increasing, the difference of downstream pressure and upstream pressure of gates become more obvious. Between power on and power off processes, the stop log gates’ pressure differences and horizontal displacements are opposite.
Main Oil Pipeline APCS with PWM-Controlled Valves and VFD Pump
Authors: Starikov Dmitry P. , Rybakov Evgeny A. , Gromakov Evgeny I.
Published: December 2014

Algorithm and structure of automatic pressure control in main oil pipeline are proposed in the article. Model of a process is being researched. Obtained results are being described terms energy losses minimization during pressure control. Crucial feature of an algorithm is an application of additional bypass valve.
Numerical Simulation of Flow Characteristics about Lateral Tooth Steam Seal
Authors: Sheng Wei , Li Zi Chao , Guan Duo Jiao , Ma Zhuang
Published: December 2014

Control equations were dissociated by the finite volume method, and the closed turbulence model equations were solved, and the different forms of flow characteristics and leakage condition in lateral tooth seal in turbine were analyzed by using numerical methods. The results show that the leakage rate of the lateral tooth steam seal with a single low tooth is less than that of the lateral tooth steam seal with double low teeth under different import pressure. And the leakage rate of the lateral tooth steam seal with a single low tooth or double low teeth and bottom teeth are slightly more than those without bottom teeth. It provides theoretical reference and technical support for the engineering design and transformation of steam seal in the turbine.