bluuebunny/crossref_metadata_2025 huggingface dataset:
Dry Sliding Wear Behaviour of Al 7075 T6 Coated by Plasma Spray Process
Authors: Abraham D.S. Manoj , Kanagasabapathy H. , Kartheesan S. , Shaji M.C.
Published: July 2014

-Al7075 T6 alloys are widely used in the aircraft, automotive and die and mold making industry, yet at any time aluminium components should be designed with a third body or in an harsh environment they must be protected with an overlying coating inorder to increase their useful lifespan and improve their surface performance especially in wear and corrosion. The most wide spread technique used to modify the surface properties of Al7075 T6 among them one of the most promosing technology is plasma spraying. It is widely used to manufacture anti-wear and anti-corrosion coatings on to a large class of bulk materials. Extreme performance and high flexibility are the Main characteristic of the coatings achievable by Plasma Spray process. In this work Nickel Carbide + Chromium Composite coating was successfully prepared and deposied with various thicknesses on the Aluminium alloy surface. Nickel Carbide + Chromium composite coating exhibits a significantly increased wear resistance property in the material. The result obtained in this work indicated that the plasma spraying method will be the promising process to coat the composite coating on aluminium based alloy.Keywords: Al 7075 T6, Plasma Spray Process, Nickel Carbide + Chromium
Influence of Sensor Positioning in Tool Condition Monitoring of Drilling Process through Vibration Analysis
Authors: Nakandhrakumar Ramasamay S. , Dinakaran D. , Satishkumar S. , Gopal M.
Published: July 2014

In this study, the relationship between vibration and tool wear and also influence of sensor positioning in tool codition monitoring were investigated during drilling. For this purpose, a series of experiment were conducted in a CNC vertical milling machine using drilling cycle. A 6 mm diameter HSS drill and EN24 as workpiece material were used in these experiments. The vibration was measured in the transverse direction of sensor which is positioned on the workpiece with constant distance from the holes to be drilled for monitoring tool wear as in previous studies. But, positioning of sensor in a constant place with equal distance from all holes to be drilled is not possible for all the workpiece profiles in actual practice. Experiments show that the distance of sensor from the holes in drilling affects the vibration signals for the same state of wear.It shows that the tool wear models presented in previous studies using acceleration signals are sensor location dependent. This work presents a Variance-amplitude of the vibration signals received for tool condition monitoring which is the most sensitive statistical parameter than other statistical parameters such as Root Mean Square (RMS), Exponential, Peak, max-min, mean and standard deviation. Results showed that there was no considerable increase in the vibration amplitude of variance until flank wear value of 0.30 mm was reached, above which the vibration amplitude increased significantly.
DWT Based Automated Weld Pool Detection and Defect Characterisation from Weld Radiographs
Authors: Sudheera K. , Nandhitha N.M. , Mohanachandran Lakshmi , Nanekar Parithosh , Venkatraman B. , Rani B.Sheela
Published: July 2014

Industrial Radiography is the most widely accepted NDT technique for weld quality in industries. As it is an indirect method, defect type and nature must be obtained by analyzing the radiographs. Manual interpretation of radiographs is subjective in nature. So the paradigm shifted to automated weld defect detection system. Though considerable research is done in automated weld defect detection, an accurate domain specific technique has not yet been evolved due to noise, artifacts in radiographs, low contrast between the defect region and the background and difficulty in isolating the defect. The proposed work aims at developing an automated weld defect detection system that enhances the contrast between the object and the background and isolates the weld defect. In this work, real time weld radiographs are acquired and contrast enhancement is performed with DWT. Slag and Porosity are isolated and dimensionally characterized.
Evaluation of Energy Model Using Hypergeometry in Friction Stir Welding
Authors: Muruganandham D , Raguraman D.
Published: July 2014

Normal 0 false false false EN-US X-NONE X-NONE Friction-stir welding is a solid state welding. The aim of welding needs to be defect free which requires uniform distribution of weld bead. In this paper the parameters such as energy, maximum temperature and thermal conductivity involved during the Friction Stir Welding process is considered as numerical data and applied it over a Hyper Geometric Function and changes in Gamma values are studied. In Gauss hyper geometric function the thermal conductivity is taken as constant while the energy and maximum temperature developed is taken as numerical variables on the Gamma calculations. The model is applied to AA2024, AA7075 and AA6061. By Hyper Geometric investigation the uniformity of weld is found to be good for the taper tool geometry. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}
Effects of Tool Pin Profile and Tool Shoulder Diameter on the Tensile Behaviour of Friction Stir Welded Joints of Aluminium Alloys
Authors: Kumar R. Ashok , Thansekhar M.R.
Published: July 2014

— For fabricating light weight structures, it requires high strength-to weight ratio. AA6061 aluminium alloy is widely used in the fabrication of light weight structures. A356 aluminium alloy has wide spread application in aerospace industries. Friction stir welding is solid state joining process which is conducting for joining similar and dissimilar materials. The friction stir welding parameters play an important role for deciding the strength of welded joints. In this investigation, A356 and AA6061 alloys were friction stir welded by varying triangular, square, hexagonal pin profiles of tool keeping the remaining parameters same and AA6061 alloys were friction stir welded by varying tool shoulder diameter as 12mm,15mm,18mm without changing other parameters. Tensile properties of each joint have been analyzed microscopically. From the experimental results, it is observed that hexagonal pin profiled tool and 15mm shoulder diameter tool provides higher tensile properties when compared to other tools.
Effects of Porosity on Strength of Aluminum Alloy 2219
Authors: Jeganlal G. , Umer H.M. , Thyagarajan K.
Published: July 2014

This paper gives the effects of single and multiple pore on the strength of AA2219 welds. Single and double pores are created on welded specimens and tested to study the effects. Also finite element analysis carriedout to correlate the experimental results with theory
Investigations on Vehicle Rollover Prevention Using Dead-Beat Controller
Authors: Binda M.B. , Rajaram M.
Published: July 2014

This paper presents results of an initial investigation into models and control strategies suitable to predict and prevent vehicle rollover due to untripped driving maneuvers. Outside of industry, the study of vehicle rollover inclusive of experimental validation, model-based predictive algorithms, and practical controller design is limited. The researcher interested in initiating study on rollover dynamics and control is left with the challenging task of identifying suitable vehicle models from the literature, comparing these models in their ability to match experimental results, and determining suitable parameters for the models and controller gains. For vehicles that are deemed to be susceptible to wheel-lift, various open-loop control strategies are implemented in simulation. The primary assumption in their implementation is that the vehicle in question is equipped with a steer-by-wire system. Nomenclature
Mechanical Properties and Stress-Strain Behaviour of Hybrid Fibre-Reinforced Self-Compacting Concrete
Authors: Meena T. , Elangovan G. , Ganesh R.
Published: July 2014

Self-Compacting Concrete (SCC) is a highly flowable, self-levelling concrete. Just as in Fibre Reinforced Concrete (FRC), fibres can be incorporated into SCC also to get FRSCC. In the present study hybrid fibres namely, Polypropylene and hooked ended Steel fibres are incorporated in different volume fractions and their fresh and hardened state properties have been studied. Fly ash and Silica Fume obtained as waste from industries are used as replacement for cement, the replacement being 10% and 5% respectively. The behaviour of HFRSCC under compression, tension and flexure has been experimentally observed. The stress-strain behaviour of SCC and HFRSCC have also been studied by varying the combinations of volume fractions of hybrid fibres.
Evaluation of Mechanical Properties of BAGcrete
Authors: Rekha K. , Thenmozhi R.
Published: July 2014

The usage of waste materials in making concrete gives a satisfactory solution to some of the problems related to waste management and environmental concerns. In the development of blended cements, some of the Agro wastes such as sugarcane bagasse ash, rice husk ash and wheat straw ash are used as pozzolanic materials. Few studies have been reported on the use of bagasse ash (BA) as partial cement replacement material. This research aims to study the physical and mechanical properties of hardened concrete prepared with bagasse ash as partial replacement material for cement are reported. The Portland cement was replaced with BA in the ratio of 0%, 5%, 10%, 15% and 20% of weight of cement. The compressive strength, splitting tensile strength and flexural strength of concrete at the age of 28 days were investigated. From the test results it was observed that bagasse ash is an effective mineral admixture, with 5% as optimal replacement ratio of cement.
Hybrid Thermal Energy Based Cooling System for a Remote Seashore Villages
Authors: Edwin M. , Sekhar S. Joseph
Published: July 2014

In India, more than 22% of milk, fruits and vegetables produced in the villages are spoiled due to lack of preservation facilities. Refrigerated cold storages at local level can be one of the methods to avoid this spoilage. Electrical operated conventional refrigeration is not viable due to the non-availability of electrical power as well as the issues in power transmission. In this paper, the feasibility study of hybrid energy powered cooling system to satisfy the cooling needs of remote seashore villages in southern part of India, where the renewable energy sources are abundantly available has been discussed. A study has been conducted on the possible of energy sources in the above said region and a LiBr-Water absorption cooling system operating with various combinations of available energy sources has been analysed using the Matlab software. Suitable hybrid energy systems with maximum overall COP have been identified and the economic analysis for such systems is also presented.
Application of Solar Thermal Energy Storage for Industrial Process Heating
Authors: Gajendiran M. , Nallusamy N.
Published: July 2014

A massive deployment of solar thermal technology is required in those industries which use large quantities of low temperature hot water for the economic operation. With the rise in fuel cost and scarcity now, there is a significant research, development and application in solar industrial process heating. Due to the unavailability of solar energy during non sunny days and diurnal changes throughout the day, storage of thermal energy is inevitable. Recent developments nationally and internationally may rekindle new applications of solar thermal energy use by industry. This paper reviews the application of solar industrial process heating in paper industry.
Integrated Offshore Wind and Seashore Wave Farm Fed to a Power Grid Using a UPFC
Authors: Alex Mariaraj , Poornima Devaraj , Karthika Ramamoorthy
Published: July 2014

This project presents the analyzed results of an integrated offshore wind and seashore wave farm fed to an onshore power grid through a unified power flow controller (UPFC) to simultaneously achieve power-fluctuation mitigation and stability improvement. A damping controller of the proposed UPFC is designed by using modal control theory to render adequate damping characteristics to the studied system. A frequency-domain scheme based on a linear system and a time-domain scheme based on a nonlinear system. From time domain analysis, the UPFC is designed. The proposed UPFC joined with the designed damping controller can effectively stabilize the studied integrated OWF and SWF under various interruption conditions. The fluctuated power injected in to the power grid can also be effectively mitigated by the proposed control scheme.
Improved Output Voltage in Micro Wind Power Generator Fed Z Source Inverter Based System
Authors: Brintha J. Jane Justin , Rama Reddy S. , Subashini N.
Published: July 2014

The micro wind power generation system is used to generate the power at low cost. In this paper, generator fed SEPIC, Z source inverter based systems are presented. The unique feature of Z source inverter is shoot-through duty cycle control by which any desired output voltage even greater than input line voltage is possible. Both buck-boost capabilities in single stage conversion are possible. This is not possible in conventional inverters. Also conversion losses are reduced in Z-source inverter due to single stage conversion which increases the output voltage of the system. Keywords: micro-wind power generation system, Single-Ended Primary Inductor converter, Z source inverter.
Modeling and Simulation of PMSG Based WECS
Authors: Jamuna Venkatesan , Baskar Manickam , Senthoor Selvam
Published: July 2014

This paper presents the modeling of PMSG based wind energy conversion systems (WECS) using MATLAB Simulink. This model contains the wind turbine, PMSG, diode rectifier, DC–DC converter (Buck – Boost) and SPWM based inverter. Due to the wind fluctuations, output voltage varies continuously. Buck - boost chopper can be controlled to maintain the constant dc voltage. The SPWM based inverter produces the constant output voltage with constant frequency for the stand alone load (Remote locations, Island, Hills Stations etc). The simulation results show that the developed model complies with the theoretical results. The PI controller maintains constant output voltage .
Biofuel (Cooking Oil) Blends Contribution in DI Diesel Engine – Performance & Emission Study
Authors: Kanthavelkumaran Natesan , Seenikannan P.
Published: July 2014

In present scenario researchers focusing the alternate sources of petroleum products. Based on this, current research work focused the emission study of its characteristics and potential as a substitute for Diesel fuel in CI engines. Current research biodiesel is produced by base catalyzed transesterification of rice bran oil is known as Rice Bran Oil Methyl Ester (Biofuel). In this research various proportions of Biofuel and Diesel are prepared on volume basis. It is used as fuels in a four stroke single cylinder direct injection Diesel engine to study the performance and emission characteristics of these fuels. Varieties of results obtained, that shows around 50% reduction in smoke, 33% reduction in HC and 38% reduction in CO emissions. In result discussion a different blends of the brake power and BTE are reduced nearly 2 to 3% and 3 to 4% respectively around 5% increase in the SFC. Therefore it is accomplished from the this experimental work that the blends of Biofuel and Diesel fuel can successfully be used in Diesel engines as an alternative fuel without any modification in the engine. It is also environment friendly blended fuel by the various emission standards.
Study on Performance & Emission Characteristic of CI Engine Using Biodiesel
Authors: Narendranathan S.K. , Sudhagar K.
Published: July 2014

Biodiesel are extracted from transesterification process of edible and non-edible oil of vegetable and animal fat. It can be used in the diesel engine either in the form of neat oil or as a mixture of diesel fuel in the form of blend. The properties of oil are compared with the characteristic required for the fuel of internal combustion engine and the properties fuel are compared with conventional diesel fuel. Use of bio-diesel in a conventional diesel engine results in substantial reduction in unburned hydrocarbon (UBHC), carbon monoxide (CO), particulate matters (PM) emission and oxide of nitrogen. The blends of biodiesel with small content in place of petroleum diesel can help in controlling air pollution and easing the pressure on scarce resources without significantly sacrificing engine power and economy.
Experimental Investigation on the Effects of Diethyl Ether Additive on Cashew Nut Shell Liquid Biodiesel
Authors: Pushparaj T. , Alosius M.Anto , S Ramabalan
Published: July 2014

Vegetable oils are a potential alternative to partial or total substitution of diesel fuels. In this study, we used diethyl ether as an additive to investigate the possible use of increased percentages of biodiesel in diesel engine without any retrofitting. Biodiesel was made by pyrolysis process. Cashew nut shell liquid (CNSL) was selected for biodiesel production. Number 2 diesel fuel containing 20% biodiesel and 80% diesel fuel, is called here as B20. The effects of diethyl ether, blended with B20 in 5, 10, 15 % by volume were used in a single cylinder, four strokes direct injection diesel engine. The effect of test fuels on engine torque, power, brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature, were ascertained by performance tests. The influence of blends on CO, CO2, HC, NO and smoke opacity were evaluated by emission tests. The experimental results showed that the exhaust emissions were fairly reduced for 10% diethyl ether with B20; especially the NO is reduced remarkably by 69.4% while comparing B20.
Performance, Combustion and Emission Analysis for Various Combustion Chamber Geometry
Authors: Arumugam S. , Vasudevan N. , Saravanan P. , Pitchandi K.
Published: July 2014

The experimental work investigates performance, combustion and emission analysis for various combustion chamber geometry such as combustion, brake thermal efficiency, specific fuel consumption, and emission characteristics. The various combustion chamber namely Spherical chamber (SC), Toroidal chamber (TC), Re-entrant chamber (RC) were fitted in a 4.4 kW single cylinder air cooled Compression ignition (CI) engine and tests were conducted with standard diesel. The investigated of the combustion chamber geometry characteristics on combustion, performance and emissions. This investigation shows brake thermal efficiency for Re-entrant chamber and Toroidal chamber is slightly higher than Spherical chamber. And lower specific fuel consumption of Toroidal chamber, Re-entrant chamber than that of Spherical chamber. The enhancement in reduction of carbon monoxide, hydrocarbon is recorded for Re-entrant chamber compared to the Toroidal chamber and Spherical chamber. Oxides of nitrogen are reduced for Re-entrant chamber and Toroidal chamber than that of Spherical chamber. Combustion characteristics improved for Re-entrant chamber compared to Spherical chamber. The cylinder pressure for Re-entrant chamber and Toroidal chamber is higher than that of Spherical chamber. Also obtained maximum heat release rate for Re-entrant chamber than Toroidal chamber and Spherical chamber.
Experimental Evaluation of Injection Pressure for a Mahua Oil Methyl Ester (MOME) Fueled C.I. Engine
Authors: Kondaiah B. , Durga Prasad B.
Published: July 2014

: The population explosion in India is causing heavy consumption of energy resources. Most of the transportation sector is based on diesel as fuel. In this regard, it is high time for the search of renewable alternative fuels to reduce the dependency of oil imports. The usage of fossil fuels is also causing environment pollution. To minimize the pollution, an alternative to diesel is found to be non edible Mahua oil. In the present work, experiments were carried out on Mahua oil methyl ester (MOME) fuel and evaluated its performance at different injection pressures ranging from 190 to 220bar with the increment of 10 bar. The effect of blending of MOME with diesel at different injection pressures were studied experimentally to evaluate the brake thermal efficiency, brake specific energy consumption (BSEC), carbon monoxide (CO), and unburnt hydrocarbon (HC) emissions. It was observed from experimental results that 20% MOME (B20) have higher thermal efficiency at 190 bar compared with pure diesel and also HC and CO emissions were reduced.
Analysis and Suppression of Common-Mode Voltage in Open-End Winding Induction Motor Drive System Fed by Dual Inverter
Authors: An Qun Tao , Wang Guang Lin , Duan Ming Hang , Sun Li
Published: July 2014

Dual inverter fed open-end winding induction motor (OEW-IM) is a new solution for multilevel drive. Comparing with traditional multilevel converters, the dual inverter is being interested in for its more flexible current control, the absence of fluctuating neutral point, and fault-tolerant capability. This paper analyzes the potential common-mode voltage (CMV) in the open-end winding induction motor system, and proposes a new space vector PWM (SVPWM) strategy to reduce the CMV. The proposed method is validated by simulations and experiments.
Adaptive Notch Filter Based Active Damping Control for Grid-Connected Inverter
Authors: Wang Ping , Cai Meng Meng
Published: July 2014

The LCL filter is widely applied as interface between grid-connected inverter and grid due to the preferable high frequency attenuation characteristic. Under the condition of weak grid, impedance value of grid model cannot be ignored, the existence of grid impedance results in different LCL resonant frequencies, which will arise challenges of traditional active damping control. Based on the analysis of band pass filter using active damping control strategy, an adaptive active damping control is proposed in this paper by introducing the application of active notch filter, which can adjust the position of negative resonance point adaptively so as to manage sudden grid changes. Theoretical analysis and simulation results presented on the platform of grid-connected PV inverter system indicate the effectiveness and adaptability of this active damping strategy.
An Earthquake Emergency Alarm System for Power Plants Based on Programmable Automation Controller
Authors: Fu Ji Hua , Li Zhi Tao , Tan Qiao , Wang Jian Jun
Published: July 2014

To avoid or relief the fatal damage of an earthquake, a seismic automatic alarm system was put forward to meet the needs of power plant. Both a digital accelerometer AKE392B and a programmable automation controller SC200AD-1 were introduced to compose the earthquake emergency alarm system. The AKE392B converts the acceleration of ground motion into a series of digital signal, and this digital signal is transferred to the SC200AD-1 by the field bus EIA485. The PAC in the system is applied to collect the ground motion data, remove the non-seismic interrupts, access an earthquake’s intensity, carry out emergency auto-handling actions by ON/OFF values, and generate emergency alarm to its parent system, power plant management system. Through theory and experiment analysis, the earthquake emergency alarm system could be easily built to measure the ground motion acceleration in accuracy, and generate the seismic emergency alarm rapidly.
The Improving Measures Research on the Cycle Life of Lead-Acid Batteries for Electric Vehicles
Authors: Lu Jun Min , Wang Xiao Kan
Published: July 2014

By describing the main affecting factors of the small electric vehicles cycle life for the lead-acid batteries,then studying the main technical measures that how to improve the deep cycle performance of the batteries to prolong its life.When the methods of the combination of grid alloys ,mixing paste and curing process parameters control, the selection of the negative organic additives and the sets mode of the positive and negative plates were used,the battery performance and the cycle life greatly improved and the failure rate decreased.
Effects of Drying Process on Lignite Quality
Authors: Tang Wen Jiao , Zhang Shou Yu , Dong Jian Xun , Guo Xi , Dong Ai Xia , Zheng Hong Jun , Deng Wen Xiang , Ding Yan Jun , Lv Jun Fu
Published: July 2014

The drying experiments of three typical kinds of Inner Mongolia lignite were conducted on a self-designed apparatus. The proximate analyses and oxygen adsorbing capacities of all the samples were analyzed on an industrial analyzer and a coal spontaneous combustion tendency tester. The results show that the treated samples show no apparent changes in their properties compared to the original lignite and no pyrolysis or combustion phenomenon occurs in the drying process. It is also observed that the oxygen adsorbing capacity of the dewatered sample is lower than that of the original lignite. Especially the oxygen adsorbing capacity of the lignite sample undergoing high-temperature drying process decreases significantly. Considering the amount of adsorbed oxygen can reflect the spontaneous combustion tendency of coal to a certain extent, the spontaneous combustion tendency of the treated lignite decreases.
The Control of Low Voltage Ride through Based on STATCOM and Crowbar Circuit
Authors: Chen Li Juan , Wang Zhi Jie , Su Xin Xia
Published: July 2014

When the grid voltage dips, in order to keep DFIG connected to grid and accelerate the recovery of grid voltage, reactive power compensation STATCOM is adapted to provide reactive power for grid, and crowbar circuit is installed to protect the converter of DIFG. Transient stability of power system is improved and the low voltage ride through is realized.
A Power Control Technology Adapting to Temperature Change
Authors: Zhang Hong Ling , Wang Yan , Yang Yan
Published: July 2014

Power control technology of LED is proposed, which can be adaptive to the change of temperature while online. The input power of LED will be adjusted according to the current value and its change rate of LED radiator. Reducing input power can balance the decreasing of the capacity of heat dissipation caused by the rise of ambient temperature in order to keep radiator temperature in a safe range. This avoids the vicious circle of the temperature excursion of P-N Junction caused by the rise of the temperature of LED light source characteristic of negative temperature. This, in turn, avoids damage to LED at high temperature.
A New Fault Location Method for 10 KV Distribution Lines with Branches
Authors: Yan Feng , Li Shuang Shuang
Published: July 2014

By using the advantages of C-type of traveling wave fault location method in distance measuring and the pattern recognition function of support vector machines (SVM),a new fault location method is presented.The first step of the method is determining the fault distance by C-type of traveling wave location method; the second one is locating the fault section by SVM. It also adopts the wavelet to reduce the noise of fault signal,and the accuracy can be more precise when the parameters of SVM are optimized.The simulation results of ATP and MATLAB show that the method can determine the single phase grounding fault point in 10kv distribution networks with branches accurately.
A Rotor Speed Sensor of Cycloid Rotor Flowmeter
Authors: Liu Shuo , Ding Fan , Ding Chuan
Published: July 2014

Positive displacement flowmeters (PDFs) are highly accurate flowmeters that are relatively insensitive to the upstream velocity distribution and fluid viscosity. Rotor speed sensors are the key components of a PDF. This paper presents the structure of a non-contact rotor speed ​​sensor which can be used in cycloid rotor flowmeter and other PDFs. The sensor outputs a square wave which contains the speed information of the rotors. The key parameters of the rotor speed sensor are analyzed in this paper and a prototype was fabricated to confirm the rotor speed sensor work well.
Application of Vortex Generator in Ultrasonic Heat Meter Measurement
Authors: Shi Shuo , Sun Jian Ting , Guo Lan Lan , Du Guang Sheng
Published: July 2014

Fluids in the heat-supply pipelines have a small amount of impurities. Impurities can easily settle down on the ultrasonic heat meters’ reflecting faces. It caused measurement inaccuracy. Vortex generator is placed in ultrasonic heat meter in this paper, which can generate vortex in the reflect fields. Vortex toke away impurities on the bottom of heat meter. Reflecting surface keeps clean. A v-shaped ultrasonic heat meter is taken for example. Numerical study of the flow field near the Reflecting surface vortex generator is carried out. Results show certain strength of vortex is caused in the reflective surface, while other palaces influenced little.
Flow Measurement of Primary Air Containing Pulverized Coal with Simple Venturi Tube
Authors: Yang Xing Sen , Yin Jing
Published: July 2014

The flow measurement of primary air is very important for thermal power plants to maintain the safe state of operation. For direct firing pulverizing system, the measuring is essentially affected by pulverized coal particles. Abrasion and occlusion would bring great trouble to the measurement. Many measuring methods are invalid under that circumstance. Lots of efforts have been made to find appropriate ways to measure the flow of primary air containing pulverized coal. Venturi tube had been successfully used to measure the flow of air. If a venturi tube is used to measure the flow velocity of primary air, the differential pressure goes higher with the increase of the concentration of pulverized coal in the primary air. The neglect of the affection of pulverized coal on the measuring would result in remarkable deviation. With the aids of coal flow rate, a method of using venturi tube to measure the velocity of primary air containing pulverized coal was established. The affection of pulverized coal on flow measuring of primary air cannot be ignored.
Research about the Testing Methods of Varistor Tester
Authors: Wang Fu Quan , Huang Jin , Gao Kang , Ouyang Zhuang , Liang Chao Sheng
Published: July 2014

We had described and discussed the testing methods of varistor tester about DC reference current, varistor voltage, leakage current, voltage ratio, and provided the corresponding test data,which has proved that the methods are feasible.
Synchronization Optimization Simulation of Optical Fiber Network Fault Features and Model Parameters
Authors: Huang Yong , Liu Heng Jun , Liu Zeng Liang
Published: July 2014

The traditional optical fiber network fault detection method has not considered the relationship between the fault characteristics and KNN parameters, it is optimized separately, and the accuracy of optical fiber network fault diagnosis is low. The synchronous optimization fault detection model of fault characteristics detection model parameters is proposed. The candidate feature subsets and K adjacent parameters are used to construct the optical fiber network fault detection model. The improved genetic algorithm is used to solve the mathematical model, and the better accurate rate of fault diagnosis for optical fiber network is obtained. The simulation is taken for testing the performance of model, compared to the traditional model, the new model has better accurate detection rate, and the detection accuracy is improved greatly, the efficiency of optical fiber network fault detection is improved, it has great application value in practice.
The Research and Simulation of Intelligent Electric Leakage Detection Model for Mining Machinery
Authors: Yu Ming Yi
Published: July 2014

For today’s coal mining enterprises, the mining production environment is very harsh and sometimes there are electric leakages in the automatic production equipment which cause a great impact on the stability of coal production. This paper proposes an electric leakage fault intelligent detection model. The intelligent method can fix the electric leakage faults on time which is an important prerequisite to ensure mine production stable and secure. The experimental results show that the model can effectively detect hardware failures and leakage.
Evaluation of On-Line DGA Limit Values and Calculation of Detecting Intervals for On-Line Monitoring Equipment for Transformers
Authors: Li Yang Liu , Chen Zhi Yong
Published: July 2014

Methods presented in this paper evaluate the on-line DGA results and provide specific on-line DGA limit values. For on-line equipment monitoring transformer condition, a method to calculate specific detecting intervals according to the evaluation of on-line DGA results is proposed. An example to calculate detecting intervals is demonstrated using the field test data acquired by on-line equipment for transformer condition-monitoring service.
The Portable Device for Detecting Smart Meter Fee Control Functions
Authors: Sun Zhi Qiang , Zhai Feng , Liu Ying , Cen Wei
Published: July 2014

In view of the current smart meter fee control functions heavy task, work intensity and other issues, we designed a new type of portable smart meter fee control functions test device. The device includes a parallel communication, automatic features such as card issuers, small size, light weight, easy to carry, to achieve automatic control function detects meter fees, enhanced energy meter test bench, between the host computer and the inspector who machine interaction capabilities, improve the detection efficiency of the staff, reducing the misuse rate, and enhance the flexibility of the testing work. The device is able to meet the needs of the current smart meter automatically detects work. Guarantee the accuracy and reliability of the energy meter testing.
A Comparative Study on the Effects of Power Supply Patterns in Microgrids for DC Powered Electrical Appliances
Authors: Narayanan Siddharth , Badrinarayanan Rajagopalan , Lu Zhen
Published: July 2014

To increase the energy efficiency and reduce the cost, the DC-Microgrids will have a very promising future in the power supply systems. In this paper, two power supply patterns for modern appliances, the central rectifier pattern and the distributed rectifier pattern, are investigated and compared. A concept of equivalent efficiency of diode bridge rectifier for DC-powered appliances is introduced and then it is applied in the model simplification. A Curved-Load model is constructed which is based on the specific efficiency characteristics of diode bridge rectifier in a particular current range and the statistics for appliance’s energy consumption as a percentage of the total. Using the Curved-Load model, the comparison of two microgrid system models was conducted with the help of simulations using Ansoft Simplorer 9.0 aiming to examine the conversion efficiency of rectifier patterns.
Analyze the Effect of Thermal Conductivity of Cold Insulation Materials in Cryogenic Engineering
Authors: Leng Ming , Li Zhao Ci , Feng Jian Yuan , Li Guang Rang , Liu Zhao Chen
Published: July 2014

The pipe heat transfer models were constructed, respectively, to simulate the cryogenic insulated structure, nonlinear partial differential equations was obtained considering the temperature-dependent variation in thermal conductivity of insulation materials. In order to get the temperature profile of insulation layer, Kirchhoff integral method was introduced to process, program, and iteratively calculate the simplified energy equations. The influence of heat-transfer process related to the thermal conductivities of four cold insulators was analyzed. Results indicate that phenolic foam, hydrophobic perlite, and RPUR have superior low-temperature insulation at cryogenic environment, while foam glass has better low-temperature insulation at normal temperature. The thickness of inner cryogenic-insulation layer can be reduced largely by using a multicomponent cold insulator in the discharge pipe of LNG stations, which can save both materials and costs. Meanwhile, it offers a new method to solve variable thermal conductivities.
A Novel Optoelectronic Oscillator with Series-Coupled Double Recirculating Delay Lines
Authors: Li Cheng Xin , Chen Fu Shen , Yuan Jing
Published: July 2014

An optoelectronic oscillator (OEO) based on series-coupled double recirculating delay lines (SC-DRDLs) is analyzed and experimentally demonstrated. The SC-DRDLs composed by the coupling cascade of two RDLs, which the free spectral range (FSR) is least common multiple of the two RDLs’ FSR, and then the large FSR can be obtained by properly setting the loop lengths of two RDLs. By consociation with the dual loops system between the dual output of the SC-DRDLs and PBS, the high sidemode suppression performance can be achieved. Meantime, the incoherence of the SC-DRDLs can be performed by using an amplified spontaneous emission (ASE) broadband laser source. An experiment is carried out. A microwave signal with high spectral purity, long-term stability, low single-sideband (SSB) phase noise is generated.
Circuit Design of the Electronic Lock of the Intelligent Management System of the Blasting Equipment Library
Authors: Li Xing Shan , Zhang Yi Fan , Lu Jian
Published: July 2014

Analyze the necessity of the standard management of explosive in the blasting equipment library of the coal mine, use digital monitoring technology, communications technology, software technology and sensor technology, use high-performance MCU STC12C5A60S2 and according to the instructions, control the opening and closing of the electronic lock, providing intelligent management
Realization of OTA-Based Grounded Gyrators Using Nodal Admittance Matrix Expansion
Authors: Li Yon Gan , Cao Rui
Published: July 2014

The paper presents sixteen nullor-mirror representations for the reported grounded gyrator by means of sixteen alternative NAME equations of the gyrator. Moreover, only four alternative grounded gyrators employing OTAs have been received. Having used canonic number of components, the circuits are easy to be integrated and their parameters can be tuned electronically through tuning bias currents of OTAs. The MULTISIM simulation results have been included to verify the theoretical predictions.
Study on the Return Voltage Function Model of Oil-Paper Insulation Medium Based on Optimization Algorithm
Authors: Li An Na , Cai Jin Ding , Zeng Jing Lan
Published: July 2014

Based on the study of dielectric response theory and equivalent circuit of oil-paper insulation medium, this paper deduces the exponential decay type return voltage function model.It also proposes that rhe function can be resolved with the application of optimization algorithm. Finally, the paper takes a return voltage curve which is tested by the oil-immersed transformer for example.Fitting results verify the accuracy of the calculation. Further more,it also explains that return voltage function model is reliable and practical. Therefore,the model plays a crucial role in the follow-up study of topological structure of equivalent circuit of oil-paper insulation.
The Design of a New-Type LED Switching Power Supply Circuit
Authors: Jing Elin , Sun Zheng Feng , Wen Hong Yuan
Published: July 2014

A new-type LED switching power supply circuit using flyback converter is designed based on current-mode PFC controller chip L6562. The circuit has some characteristics such as simple structure, wide input voltage range, output stability and reliable operation. The experimental results show that the system efficiency is up to 89.46% when the input voltage changes from 85V to 265V(AC), meanwhile the system works stably with constant current and constant voltage output.
Acquisition of Time Parameters and Charges in the Streamer Discharge Simulation
Authors: Zhang Ze , Ding Yu Jian , Xie Qing
Published: July 2014

Because of the dynamic characteristics of the streamer discharge, the acquisition of time parameters is very important to the streamer discharge simulation in the rod-plate air gap. This paper raises a new method to get the time parameters and charge development in the discharge of air gas, and the comparison of our results and the test results shows that the new method is very suitable and correctly to describe the stream discharge process.
Design of Performance Analysis System of Secondary Circuit in Intelligent Substation Based on NI Platform
Authors: Jiang Hai Tao , Chen Chao , Bu Jing
Published: July 2014

At first, this paper introduce some current tests of secondary circuit in intelligent substation, then, design a performance analysis system of secondary circuit in intelligent substation based on NI platform. This kind of system analyzes analog and digital quantity messages for getting the performance of secondary system by algorithms, so that working personnel can grasp the performance comprehensively. Meanwhile, a prototype is developed to be applied in an unused intelligent substation, and the result is satisfied.
Parameter Optimization of Virtual Impedance for Parallel Inverter
Authors: Wang Ping , Yang Liu
Published: July 2014

This paper deals with parameter optimization of virtual impedance of parallel inverter. Conventional design methods determine parameters by observing the changes of amplitude-frequency and phase frequency curves of the equivalent impedance. However, those methods always neglect the dynamic performance of inverters in parallel. This paper proposes a novel method to optimize the coefficients of virtual impedance and experiments show that new method improves the dynamic performance of parallel inverter effectively, as well as stability and flexibility.
PV Cells Power Generation System Modeling Based on Heat Energy Efficiency
Authors: Li Feng Feng , Wu Qiu Xuan , Huang Li Juan , Huang Yu Jie
Published: July 2014

Temperature is one of the important factors affecting the power generation efficiency of PV cells. In order to improve the efficiency of photovoltaic power generation systems and heat utilization efficiency, we used Matlab/Simulink to build photovoltaic power system analysis model based on thermal power. By changing the heat and illumination input to the photovoltaic cell model and the heat generated by the battery we got the characteristics and temperature characteristics of the photovoltaic cell the system model, the photovoltaic power generation system model and the output power correction, etc. We got the environmental temperature change equation through the actual air temperature and curve fitting and used real and detailed data to compare the data obtained using the equation for online correction. PV cells temperature factor was used to get the PV cells temperature with the environment temperature changes. In order to get PV module thermal /energy efficiency the dates was processed and analyzed by using Matlab and Excel through actual observation data of school 120KW PV power station. The results showed that power generation efficiency increased and year average efficiency PV improved 21.3279% through the use of some heat about PV cells.
Research on the Methods of Interharmonics and Flicker Limit Curve
Authors: Wang Tian Shi , Wang Qing Hao , Wang Yi , Li Na , Liu Jing , Chu Li Na , Liu Zhi Tong
Published: July 2014

In order analyze the inter-harmonic affections on the voltage flicker, the relationship between the inter-harmonics and flicker analysis are carried out. In order to be able to accurately determine the level of inter-harmonics to make the electric light flicker, interharmonic-flicker limit curve drawing method based on the voltage flicker constraints is established. And according to IEC lamp-eye-brain model, analog tester flicker and interharmonic-flicker experimental platform are built; limit curve can be drawn through the experimental data. The 2 kinds of harmonic-flicker limit curves for the 220 V, 50 Hz fluorescent lamp are drawn by the 2 methods separately, and the analysis results show that the accuracy of the results obtained by the two methods, the level of interharmonics whether lead to fluorescent flicker can be determined by the curves. The methods have the small amount of calculation, and are practical and easy to implement.
Review on Mechanism and Analysis Methods of Low Frequency Oscillation in Power System
Authors: Wang He Nan , Zheng Chao , Ren Jie , Tian Jian She , Liu Hong Tao , Sheng Can Hui
Published: July 2014

Low frequency oscillation caused by system interconnection has been the main factor to threat the secure operation of power grid. It’s significant to research on the problem of low frequency oscillation. This paper summarizes the generation mechanism and analysis methods of low frequency oscillation. Each analysis method has both advantages and disadvantages.
The Research on Establishing Method of the Broadband Nonlinear Transformer Model
Authors: Zhang Zhong Yuan , Wang Zeng Chao , Zhang Xin
Published: July 2014

The transformer model is one of the most needed to improving components of the modern transient simulation software. A new nonlinear broadband frequency (50Hz-10MHz) model of power transformer is proposed in this paper. The model is divided into a linear block and a nonlinear block by a reasonable equivalent transformation. The linear block is set up through measuring and synthesizing. And the nonlinear block is derived by the impendence of iron core. The final circuit model is built in Simulink, and the comparisons between the simulation and measurement results verify the feasibility and validity of the model.
An Improved FCM Algorithm Based on Subtractive Clustering for Power Load Classification
Authors: Dong Rui , Huang Min Xiang
Published: July 2014

FCM is used in many power load classification currently, but it also has some shortcomings. This paper give an algorithm based on Subtractive Clustering and improved Fuzzy C-means Clustering (SUB-FCM) to solve this problem. This algorithm use subtractive clustering to initialize the cluster center matrix, solve the random initialization of FCM, and improve the global search ability, avoid falling into local optima. Experimental analysis found this algorithm also could accelerate the convergence speed, and has better clustering results. It can be applied to power load classification effectively.
The Analysis of the Transmission Signal Measured MIPI D-PHY
Authors: Wei Wei , Zhang Fei Teng
Published: July 2014

Analysis the characteristics of the measured transmission signal of Mobile Industry Processor Interface (MIPI) Display Serial Interface Physical Layer (D-PHY) interface based on a project platform. Firstly, introduces the transmission characteristics and mutual conversion process of physical layer about high-speed and low power mode, and by the transmission signal measured a platform of high-speed mode, present the D-PHY transmission signal each test items and test point selection, make the phone run smoothly and screen display normally, this test analysis certain practicability and expansibility.
The Research of Self-Adaptative Power Adjustment Routing
Authors: Ding Zhi Ping
Published: July 2014

Cognitive Radio Ad Hoc Network (CRAHN), established on the cognitive radio environment, configures the Ad Hoc Network which possesses the internal capacity. How to effectively control the power consumption is an important issue in the CRAHN for CRAHN‘s main power type is battery. At present, the energy-saving routing research in CRAHN is mainly based on the real-time routing mechanism. It means that it should be routed again after transferring an archive. In order to increase the network route’s surviving time and save the power consumption, it introduces a routing mechanism whose purpose is to optimize the communication algorithm’s performance by improving the existing routing mechanism in the Ad Hoc network.