bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Modeling and Analysis of Lifting Mechanism for Forging Manipulator
Authors: Hu Jian Ming , Ding Wen Hua , Deng Hua
Published: March 2013

The kinematic and dynamic behaviors of lifting mechanism for a forging manipulator are investigated. The forward kinematic equations are established. Then, based on the modular approach combined with equivalent dynamic ideal, the dynamic equations are deduced. Moreover, all the equations have been verified by the simulation on a virtual prototype with the ADAMS software and the experiments on a forging manipulator. The results show that the calculated values are well in agreement with the real measurements. Finally, both kinematic and dynamic models are analyzed, and it is found that the force produced by the kinetic energy has very weak effect on the results in comparison with the gravity. The results provide the foundation of gripper’s position control in automatic open-die forging process.
Simulation Research on Multi-Robot SLAM of Information Filter
Authors: Li Shan Shan , Xu Ya Hong , Xu Xiao Long , Zhu Ning Hui
Published: March 2013

Multi-robot SLAM is a technology of multi-robot simultaneous localization and mapping cooperatively in unknown environment. We use information filters algorithm to solve multi-robot SLAM problem. Information filers use information matrix to describe the SLAM uncertain information, and multi-robot SLAM information matrix contains all robots poses and all the features observations which observed by all robots. We set up the multi-robot models, motion models and observe models, and set up feature-environment to simulation in computer. We set threshold to divide the features which are observed by robot k on current time, one part of features are used to relocalization as active maps, and the other features are used to update information matrix and information state. The simulation data shows that information filters can keep the accuracy of the robots poses, and keep the motion update and the observation update in the constant range, the algorithm improve the effective of multi-robot SLAM.
A Review on Cycle Sign Center Detection in Industrial Photogrammetry
Authors: Wang Ren , Zhu Xin Hui
Published: March 2013

Technology about cycle sign’s center detection in industry photogrammetry was reviewed. Two mayor algorithms were analyzed theoretically and experimented including edge-detection method and intensity-weighted average method. The result shows that edge-detection method is vulnerable to noise and intensity-weighted average method is robustness which is more suitable to be used in actual works.
New Measurement Methods of Evidence Conflict Based on Binary Function
Authors: Zhu Jing , Wang Chen Xi , Zhang Cheng Jun , Hu Li Fang
Published: March 2013

In the belief function theory framework, how to measure conflict between evidences is the first step in the combination of conflicting evidences. However, the existing conflict measurement methods have some limitations. Two new methods based on binary function of the combined belief assigned to the emptyset before normalization and the distance betting commitments of beliefs are proposed. Two methods have three advantages. Firstly, they are more suitable for people's intuitive logic reasoning. Secondly, they overcome the operational problem of the existing binary conflict measurement methods. Thirdly, new methods can measure the conflict between any pieces of evidence simultaneously, which can satisfy the interchangeability and combinability. Some illustration results are presented to demonstrate the effectiveness of the improved methods.
Research on Millimeter-Wave Radar Based Automotive Lateral Anti-Collision Warning System
Authors: Tian Xing , Bi Xin , Liu Yi Yang , Du Jin Song
Published: March 2013

According to the reasons and features of car accidents happening in vehicles’ side areas, this paper designed and developed a kind of automotive lateral anti-collision warning system by frequency modulation continuous wave, based on the research on 24GHz linear frequency modulation continuous wave radar-probing system. The system designed in this paper will forecast the potential danger to drivers and avoid the accidents. The hardware structures, algorithm, program flows and working patterns of the warning system were introduced. Furthermore, pointing to the problem of false alarms, a kind of filtering method was presented creatively. This method improved the reliability of the warning system and the accuracy of the forecast. It filtered the disturbance coming from the side of the vehicles, and solved the difficult problem that prevented the millimeter-wave radar from being applied in automotive lateral anti-collision warning system. Finally, the experiment was designed and carried out. The result verified the rationality of the solution and the practicality of the system’s function.
The Application of Coulter Multisizer in the Experiment of Medical Equipment Product Particle Detection
Authors: Guo En Yu , Zhang Jun Zi , Liang Hao Fang
Published: March 2013

Abstract. Objective: To explore the application of Coulter Multisizer in the experiment of medical equipment product particle detection through the Coulter method of particle content measurement. Methods: Analyze the particle content by Beckman Coulter Multisizer 3 produced by Beckman Company, and compare the particle content detection result of blank contrast solution and eluant. Conclusion: Coulter method and Coulter Multisizer have a great advantage on medical equipment product particle detection.
Theoretical Study of the Spectrum Detection and Imaging for the New Double-Sided Mirror Optical Path
Authors: Zhao Guang Xing , Zhao Yuan , Zhang Hui , Wang Yan , Li Dan
Published: March 2013

Proposed a new double-sided mirror optical path having only one optical element from the entrance slit to the detector between. Theoretical studies show that the optical path can be used to the spectrum detection and imaging of one dimensional target point. This is important for interference imaging spectrometer to simplify the design of the optical path, lighten the weight of the remote sensor and reducing the light energy loss of the optical path.
Research and Development of a Test System for the Dynamic Performance Testing of Pneumatic Solenoid Valves
Authors: Liu Hao , Tao Guo Liang , Xiang Zhong
Published: March 2013

Based on the study of a new method which can calculate the dynamic performance parameters with the dynamic pressure data of the valve in the high-speed on/off process, a test system for the dynamic performance testing of pneumatic solenoid valves is developed in this paper. The dynamic performance of a pneumatic solenoid valve that obtained by test is a key index data for selection and application. To study the dynamic process, a mathematic model of the dynamic pressure in the valve’s control cavity is built up. As analyzing the relationship between the movement of the valve spool and the dynamic pressure during its high-speed on/off process, the method proposed a new criterion that can pick out the key points of the spool’s movement by the data of dynamic pressure which can be obtained by test easily. Then, the dynamic performance parameters of the valve can be determined with those key points. The structure of the test system that formed on this method is presented. Comparing the test results obtained from the new test system build in this paper with the results obtained from the valve spool displacement laser detection system, it is showed that every characteristic parameter is matched well. The comparing error of total opening time delay and total closing time delay are less than 3%. It is verified that the new method can test the dynamic performance of pneumatic high-speed on/off valve accurately.
Research of Magnetic Grid Rail Splicing Technology Based on Phase Difference Detection Method
Authors: Gu Wen Tao , Lei Shao Kun , Li Fang , Zhou Shao Wei
Published: March 2013

To meet the high real-time performance and high accuracy requirements of signal detection in the rail splicing process, this paper proposes a new type of magnetic grid rail splicing method based on accurately zeroing output signal phase difference of two magnetic grid reading heads, thus establishing two reading heads “shift” rules. The accurate zero setting technology of phase difference is based on Nuttall window algorithm, which doesn’t need to give the exact signal frequency beforehand and sample periodically, and can effectively eliminate phase errors. So this algorithm is suitable for detecting signal phase difference when reading heads go over buff joints with any speed at any initial position. Additionally, simulation test and experimental verification were performed on this detection algorithm and “shift” rules. The results show that, the method mentioned in this paper can real-time detect the phase difference by “shift” rules, when reading heads go over buff joints with any speed or any acceleration.
A BIST Structure for ADC in Mixed-Signal SOC
Authors: Yin Shi Rong , Liu Chao Tao
Published: March 2013

A BIST structure for ADC test in Mixed-Signal SOC to characterize both the dynamic and static parameters was presented. A Sigma-Delta modulation based sinewave generator was built on the chip. The frequency, amplitude and phase of the sinusoidal signal can be adjusted through proper selecting generator parameters which are stored in ADC WBR. The response analyzer was built up from the memory and computational resource in the SOC.
Constrained Total Least Squares Algorithm Applied to Three-Axis Magnetometer Calibration
Authors: Wu Zhi Tian , Hu Xiao Ping , Wu Mei Ping
Published: March 2013

Strapdown three-axis magnetometer is becoming increasingly used in navigation systems and in biomedical applications. A calibration must be performed before the magnetometer can be used, because its outputs are often corrupted by various magnetic field sources. This paper presents a new calibration algorithm based on constrained total least squares (CTLS) to determine different calibration parameters such as sensor non-orthogonality, scale factors, offsets, hard iron and soft iron errors. The basic idea is to convert the calibration problem into an unconstrained nonlinear optimization problem. An iterative technique based on Newton’s method is applied to give a numerical solution. Simulation results show that the proposed CTLS algorithm gives more accurate solutions than compared algorithms.
State Management System of Gateway Electric Energy Metering Device Based on NI CompactRIO Platform
Authors: Xiao Ji , Cheng Ying Ying , Tian Juan
Published: March 2013

For the sake of real-time online monitoring the operating state and parameters of electric energy metering devices, detecting the abnormal states of devices, predicting the trend of electric energy metering device error, and changing the traditional management mode for electric energy metering devices, which adopts the cycle test rotation mechanism, this paper has proposed a state management system of electric energy metering device based on NI CompactRIO platform. The proposed system can implement real-time online management for monitoring the measurement error of electric energy meter, data acquisition of electric energy meter, test of Secondary Voltage Drop and Secondary Load of PT, test of Secondary Load of CT, video monitoring, measurement of temperature humidity, measurement of space magnetic, etc. The system combines CompactRIO platform and electric energy metering devices to acquire, monitor and analyze the real-time online data corresponding to electric energy meter, CT, PT and secondary loop. And the Energy metering error and the evaluation of parameters of electric energy metering device are calculated by the CPU, and the data is exchanged with the remote station by communication network. So the system improves the management efficiency and benefits of electric energy metering devices.
Research on the Driver's Following Behavior Based on Hybrid Electric Vehicle Model
Authors: Piao Chang Hao , Duan Chong Xi , Li Yu Sheng , Lu Sheng
Published: March 2013

On the basis of Hybrid Electric Vehicle (HEV) model, this paper has developed the driver's following behavior model. Reasonable following behavior is very important in traffic safety. Firstly, this paper has gotten the relationship between vehicle speed, acceleration and pedal depth by vehicle performance testing. Then car-following model based on regression analysis was developed, meanwhile reasonable amendments of the distance model was added. Finally，graphical user interface (GUI) of driver's following behavior was designed, which can displays the simulation results intuitively. Simulation results show that driver's following behavior model is reasonable and effective. It has a good effect both on traffic safety and traffic-economic.
The Finite Element Analysis and Optimization for the Grinder Based on the Joint Surface
Authors: Zhang Xiang Lei , Yao Bin , Zhao Wen Chang , Kun Ou Yang , Yao Bo Shi
Published: March 2013

Establish the finite element model for high precision grinding machine which takes joint surface into consideration and then carrys out the static and dynamic analysis of the grinder. After the static analysis, modal analysis and harmonic response analysis, the displacement deformation, stress, natural frequency and vibration mode could be found, which also helps find the weak links out. The improvement scheme which aims to increase the stiffness and precision of the whole machine has proposed to efficiently optimize the grinder. And the first natural frequency of the optimized grinder has increased by 68.19%.
Influence of Vehicle Velocity and Mass on Washboard Enhancement Coefficient
Authors: Li Wen Liang , Zhou Wei , Gao Li
Published: March 2013

With finite element simulation method, the fatigue life of vehicle front floor is analyzed in different vehicle masses and velocities, and the washboard enhancement coefficient is calculated, then K-v curve, K-m curve and K-v-m surface are drawn, with which influence of vehicle velocity and mass on washboard enhancement coefficient is studied. The study results show that, when the mass is constant, washboard enhancement coefficient increases first and then decreases with velocity increasing, and reaches peak at a certain velocity; when velocity is constant, washboard enhancement coefficient decreases as mass increasing; when velocity and mass both changes, washboard enhancement coefficient varies in K-v-m surface.
Considering Thermal Deformation in Gear Transmission Error Calculation
Authors: Wang Yu Ning , Sun Zhi Li , Yin Ming Ang
Published: March 2013

This research analyze the gear for body temperature field, according to the body temperature field, it calculates comprehensive deformation of the loaded gear by using the contact method. It extracts the deformation of gear surface along the gear thickness and gear tall direction, calculating the gear non-involute error. It calculates the gear transmission error considering the thermal deformation. The results show that: Considering thermal deformation non-involute error of addendum is maximum, and there are no mutations in gear non-involute error the transmission error caused by mutation of elastic deformation mutate at single and double tooth alternating position. The bigger mutation becomes, the bigger vibration amplitude will be. The results of the study provide a solid basis to improve the motion transmission accuracy of gear.
Numerical Simulation and Performance Prediction for Hydraulic Performance of Mine Drainage Pump
Authors: Li Bao Liang , Yan Zhi Shun , Hu Xiao Wei
Published: March 2013

By using the CFX technology in ANSYS Workbench, based on the different operation conditions, the numerical simulation of three dimension steady turbulent flow is carried on the D type mine drainage pump. The pump includes first impeller and guide vane, secondary impeller and guide vane, inlet, outlet. The results will reveals the distribution law of flow field and static pressure, and it further forecasts the performance curve of the multistage pump by means of choosing standard model and setting frozen interface. This method can provide certain theory basis for the energy saving work of the multistage pump.
Numerical Investigation of Heat Transfer Enhancement with Mist Injection
Authors: Elwekeel Fifi N.M. , Abdala Antar M.M. , Zheng Qun
Published: March 2013

In the present work, computational simulations was made using ANSYS CFX to predict the improvements of internal heat transfer in rectangular ribbed channel using different coolants. Several coolants such as air, steam, air/mist and steam/mist were investigated. The shear stress transport (SST) turbulence model is selected by comparing the predictions of different turbulence models with experimental results. The results indicate that the heat transfer coefficients enhance in ribbed channel at injection small amount of mist. The heat transfer coefficients of air/mist, steam and steam/mist increase by 1.13, 1.57 and 2.07 times than that of air, respectively. Furthermore, comparing with droplets size, the proper size is from 6 to 10 µm. which had the best enhancement performance in ribbed duct.
A Two-Position Press Machine Based on Linear Motor and Lever-Double Rollers Force-Amplifier
Authors: Wu Fan , Zhong Kang Min , Ma Yan Ping
Published: March 2013

The paper has designed a two-position Press Machine based on linear motor and lever-double idler wheels force-amplifier and analyzed the system principle and mechanics. The press machine can amplify the force evidently and improve the function, using only a linear motor to drive two positions work with its simple and compact structure. This will improve the work efficiency and reduce the cost of the machine.
Method to Set the Zero-Datum of Axes of Parallel Mechanisms
Authors: Fan Ze Ming , Li Xia , Ma Long
Published: March 2013

A new method to set zero-datum on each driving axis of CNC machine tools is proposed in this paper. The accurate method to determine the zero-datum of the virtual-axis of hybrid CNC machine tools composed of parallel parts is discussed as illustration. The correcting system and the correcting algorithm of posture zero-datum are described separately. Further more, the accuracy of position return-to-zero is experimented simultaneously.
An Experimental Study of Sweep Effect on 3D Flow Downstream of Axial Fans at Off-Design Conditions
Authors: Jin Guang Yuan , Ouyang Hua , Du Zhao Hui
Published: March 2013

The 3D flow characteristics in axial fans with circumferential skewed blades were investigated at off-design conditions using Hot-wire test, and the effect of sweep on controlling the aerodynamic limits was discussed. Two circumferential skewed fans, with the blade skew angles at 8.3° forward and backward, respectively, were investigated in this study. The 3D instantaneous velocity components in nearfield, downstream of the fans were measured using Hot-wire Anemometry (CTA) at off-design conditions. From the measured results, the structure of passage flow in circumferential skewed fans is analyzed according to flow rate. The boundary layer flow and its relation with circumferential skewed blades, to expand stall-free operation range of axial fans, were discussed. As flow rate decreases, the 3D flow structure in blade passage is controlled by the circumferential skewed blades, and the obvious suppression of decreasing passage flow near shroud and hub region; the main flow retains at mid blade span; the radial flow can’t be neglected; the forward-skewed blade is found to be effective in controlling low energy flow in the vicinity of shroud and hub to expand stall-free operation range; the effect of skewed blades on boundary layer is discussed by radial equilibrium equation; as the centrifugal force increases, the blade radial force Fr of the circumferential forward-skewed blade has an positive effect on pressure gradient, and seems to be efficient to control the style and velocity of boundary layer movement.
Velocity in High Viscosity Fluid Forming Process
Authors: Zheng Jian Li , Bai Ren Hua , Gao Yuan Lou
Published: March 2013

In the process of extrusion of explosive whose melt is high viscosity fluid, the quality of explosive is decided by temperature field and flow velocity, because temperature field is depend on the flow velocity and temperature of Jacket water, velocity in forming process has more impact on quality of product. The paper studies on the relationship between flow velocity and molding quality by simulate the progress that relevant a plant. The result shows that quality and velocity of flow are positively related to the square.
Research on Thermal Character of Inorganic High Temperature Phase Change Materials
Authors: Li Yue Feng , Zhang Dong
Published: March 2013

Recently advances in testing methods and study of the inorganic salt establish the high temperature phase change energy storage materials as a promising candidate for solar thermal power generation, industrial process heat use and waste heat recovery. In this paper, a phase change model related to the warming-cooling method was established to test the phase change temperature and the heat of LiCl-NaCl(1.08-1) and Ca(NO3)2-NaNO3(4-7). The result tested by the warming-cooling method is mainly in line with the one tested by other method. The data allows a promising development of the energy storage.
The Activities of NO Oxidation over the Pt/γ-Al2O3 Catalyst
Authors: Deng Zhi Peng , Li Jian , He Hong , Zhang Lu Di
Published: March 2013

Pt catalysts were prepared by incipient wetness impregnation,It was investigated that the effects of the support and the loading of Pt on the activities of NO oxidation over supported Pt catalysts, The investigation indicates that Pt/γ-Al2O3 was better performance than Pt/ZrO2, Pt/CeO2, Pt/TiO2 and Pt/Ce0.4Zr0.6O2 on NO oxidation.The optimal Pt loading over Pt/r-Al2O3 was 1%, the NO conversion efficiency of 54.9% at 300°C, close to the conversion rate of thermodynamic equilibrium of the NO oxidation reaction.
Research on Aircraft Magnetic Compensation Based on Improved Singular Value Decomposition
Authors: Zhang Jian , Deng Peng , Lin Chun Sheng
Published: March 2013

In aeromagnetic detection, the estimation of the regression parameters in aircraft magnetic interference model is the key of aircraft magnetic compensation. Taking aim at the multicollinearity of aircraft magnetic interference model, a new parameters estimation method with combination of wavelet threshold denoising and singular value decomposition (SVD) was proposed, which is called WSVD. First, wavelet threshold denoising was used to pretreat magnetometer data in order to decrease the noise of electric equipments which will influence the accuracy of parameters estimation. Then SVD was used in the estimation of regression parameters. In a simulation example, the estimation accuracy of LS estimation, SVD and WSVD was compared in different signal to noise ratio (SNR). The result shows that WSVD is more accurate than other two methods, especially more adaptive in low SNR. And the regression parameters of WSVD is effective in aircraft magnetic compensation. The compensation ratio is above 90%.
The Use of Fabric Composite Frequency Selective Surface in Sandwich Structures for Low-Observable Radomes
Authors: Li Chang Liang , Jiang Da Zhi , Zeng Jing Cheng
Published: March 2013

In this work, the hybrid fabrics of carbon and quartz fibers as filters were adopted in PMI core sandwich structures for low-observable radomes. The advantages of fabric composite frequency selective surfaces (FCFSSs) are easily fabricated by braiding and shaped into curved surfaces. This paper mainly studied the electromagnetic (EM) transmission characteristics of the low-observable radome wall with composite FSS by 3-dimensional electromagnetic analysis software. First of all, the accuracy of the simulation model composed of up and down composite face sheets, a layer of composite FSS and PMI core was validated by comparing with experimental results. Then, the studies on electromagnetic transmission characteristics of the sandwich structure with composite FSS and the sensitivity analysis about the thickness and permittivity of face sheets and PMI core were carried out. The results show that the sandwich structure with single layer composite FSS can realize the function of frequency selection, limit the reflection at the resonance frequency and decrease the sensitivity of EM transmission loss about the thickness of sandwich structures.
A New Method Based on Interation Algorithm to Extract Parameters of Constitutive Equations
Authors: Hua Yong Zhi , Guan Li Wen , Liu Xin Jun , Zhang Yu Hui
Published: March 2013

These methods that extract parameters of constitutive equations can be divided into three groups: direct search-based strategies, gradient-based methods and evolutionary algorithms. By analyzing these strategies, a new method based on iteration algorithm was proposed. To obtain parameters of JC and ZA model for Ti-6Al-4V, the error between prediction data and SHPB experiment data was set as objective function, then initial value was calculated using iteration algorithm. The effect of convergence rate and precision at various steps and experiment data was invested. The main advantage of the method are as follows：fast calculation; compatible with SHPB data and orthogonal cutting data; compatible with the decoupling and coupling constitutive equations. Finally, it has shown that the algorithm is stable, and acceptable results can be obtained.
A Design of Wireless Sensor System for Water Quality Monitoring of Oil Field
Authors: Huang Shou Zhi , Zhao Xue Zeng
Published: March 2013

In these years, petroleum and natural gas exploitation cause underground water pollution worldwide. And the leak of the crude oil and injection of waste water in the fracking process are two main reasons of water pollution during the exploitation. So monitoring the water quality in petroleum and natural gas exploitation area is more and more important to assure the drinking water’s safety for people who live nearby. In this paper, a wireless sensor system for water quality monitoring based on wireless sensor networks (WSNs) is designed. This system uses XBee modules as the communication units and chooses proper sensors to monitor the key parameters for water quality including PH, turbidity, conductivity and temperature. And we also use LABVIEW to build an interface to monitor, restore and analyze the data collected.
Study on the Settlement Experiment of Iron Tailings
Authors: Sun Dong Yang , Zhou Xing Long , Luo Wen Bin , Liu Zheng Qiang , Shi Zhi Xin , Zhang Xiao Ming
Published: March 2013

The settlement experiment of representative iron tailings was studied, the iron tailings were from a processing plant of Wuhan Iron and Steel Group. There were four experiments were conducted which includes nature sedimentation test, coagulation sedimentation test of inorganic salt coagulant, flocculation sedimentation test of polymer flocculant and the mix coagulation sedimentation test. The test results showed that the size of sample is relatively fine and unevenly distributed, what's more, the velocity of natural sediment is very slow, and the effect that concentration has on the settling velocity of particles is obvious. The inorganic salt coagulant could reduce turbidity of supernatant, but it play a limited role in improving settling rate, it was found that FeCl3 is the best coagulation agent, PAM is effective flocculant for the sample, and the coagulation effect of cationic flocculation (molecular weight is six million) is better than that of anionic and nonionic. The settling velocity of particles was improved and the solid content of supernatant was reduced in the mix coagulation sedimentation test, but the improvement of settling velocity was not obvious. The author suggests that the single cationic polyacrylamide flocculant which was used for pretreatment on the tailings could meet the requirement of the tailings settlement.
Study on Energy Consumption Prediction and Energy Management in Jilin Province Based on STIRPAT Model
Authors: Ma Zhuo , Liu Wei , Wang Lei , Ma Ping Liang , Wang Yong Xuan , Dong De Ming , Duan Hai Yan , Wang Xian En
Published: March 2013

Energy consumption control and energy management are the important guarantee for the sustainable development of economy and society in China. Take Jilin province as an example, we study the methods and practice of energy consumption peak prediction, discuss the control countermeasures of energy consumption peak and study the countermeasures of energy efficiency and energy management. The study shows that, technology advances, industry restructuring and energy structure adjustments are the important means of energy management.
Effects of Evaporation Coefficient and Inertial Force on Thermal Performance of an Evaporating Thin Film
Authors: Kou Zhi Hai , Bai Min Li , Zhao Guo Chang
Published: March 2013

Evaporation at thin liquid film can significantly enhance heat transfer process. A detailed mathematical model predicting the heat and mass characteristics of the evaporating thin film is developed. The model considers effects of inertial force, evaporation coefficient, interface thermal resistance, and disjoining pressure. It is found that the interface thermal resistance is in inverse proportion to the evaporation coefficient. The heat and mass transport characteristics decreases sharply as the evaporation coefficient decreases. The inertial force tends to enhance the heat and mass transport characteristics of the evaporating thin film. However the Reynolds number of the liquid flow in the evaporating thin film is far lower than unity, and thus the effect of the inertial force can be neglected.
A Review on Hybrid Solar Power System Technology
Authors: Li Ting Ting , Xu Guo Qiang , Quan Yong Kai
Published: March 2013

Solar energy utilization has met some complicated problems in recent years, like energy storage, solar thermal power generation dispatchability and grid connection etc. The concept of hybrid solar power systems proposed in early researches has extended the conditions of exploiting solar power generation technology，this paper reviews hybrid solar power system technologies in the past 40 years. According to different complementary energy resources, hybrid solar/renewable energy and solar/conventional energy systems have been discussed in this paper. Particularly, this article presents the thermal and economic performances of Integrated Solar Combined Cycle System (ISCCS).
Simulation of FSK-DSSS Ultrasonic Communication System
Authors: Xue Xiao Jun , Zheng Yu Zheng
Published: March 2013

Through analyzing the transmission characteristics of Ultrasonic on Ultrasonic transducer, this paper gets channel parameters of ultrasonic transmission. And a new model of ultrasonic channel is given in Matlab/Simulation environment. Using this model, FSK-DSSS communication system is realized according to theoretical analysis and experimental test. Finally this paper shows relationship between the SNR and Bit Error Rate, which proves that this system has good noise immunity. Data can be demodulated successfully when the SNR is above -10 dB
The Influence of Reservoir Level Plummeting on Slope Stability Reinforced by Pile
Authors: Jiang Jian Qing , Su Guo Shao , Yan Liu Bin , Ding Lei
Published: March 2013

Lagrange finite difference method basing on the strength reduction principle is applied to simulate the reinforcement effect of anti-slide pile for slope under water plummeting condition. The influence factors of reinforcement effect including speed of water level plummeting, the ratio between water depth and slope height, the location of pile is discussed. The study results show that the higher speed of water level plummeting may result in less value of slope safety factor. Moreover, the relationship between the ratio between water depth and slope height change significantly before and after reinforcement under water level plummeting condition. The study also reveal that the location of pile have important influence on the reinforcement effect.
Proposed Model for Optimizing Production System Using CMS
Authors: Arora Pawan Kumar , Haleem Abid , Singh M.K. , Kumar Harish
Published: March 2013

Manufacturing cells are created by grouping the parts that are produced into families. This is based on the operation required by the parts. These cells which consist of machine or workstation are then physically grouped together and dedicated to producing these part families. In this paper a mathematical mode is presented to grouping the machine parts and machine cell. The objective of the proposed model is to minimize the mean flow time and maximize the throughput. This work presents a Genetic Algorithm for the cell formation and part family.Here, the implementation procedure of GA in the CMS problem has been discussed along with the detail of algorithmic parameters used in the algorithm
Identification of Credit Risk of Personal Loan in Commercial Bank Based on SVM
Authors: Zhang Zeng Lian
Published: March 2013

Guard against financial risks, reduce bad loans, increase the ability to identity risk of commercial banks, the key is risk warning. In view of the increasing proportion of personal loans in banking business, it is particularly important to warning personal loans credit risk. Commercial bank lending itself is a complex nonlinear system, using general linear theory is difficult to objectively reflect the laws of this, this paper uses SVM(support vactor machine). Personal loan credit index first constructed, and then use SVM to identify risk. Results showed that SVM plays an important role in identifying risk in personal loans.
Mobile Robotic Systems for Fragmentation of Nuclear Equipment
Authors: Vargovčík Ladislav , Holcer Roland , Medved Jan
Published: March 2013

For liquidation of the heavy water evaporator has been applied a mobile robotic system MT 80, which had been developed, designed and constructed as a general-purpose decommissioning equipment. The heavy water evaporator as a part of the NPP heavy water system is located inside the main production unit building in Room No. 220 where the inner surface contamination is from 101 Bq/cm2 to the level of 103 Bq/cm2, dose rate up to 1.5 mGy/h and the feeding pipeline contained LRAW with high tritium content. The first step was the development of a work procedure with special focus on the elimination of activity and aerosols leaking into the environment. Special tooling was developed for application with the robot, such as hydraulic shears, circular saw, reciprocating saw, circular pipe cutter and a system for quick tool-change without direct intervention of the operators. All operations are remotely controlled on basis of visual information from four cameras, with consistent radiation protection of the operators.
ROBIHO – A Robot Companion for Elderly People’s Homes
Authors: Gonçalves Paulo J.S. , Torres Pedro M.B. , Lopes Paulo
Published: March 2013

In developed countries elderly people is gradually increasing. Society is abandoning their parents and/or gran-parents, and often are found dead at home without any aid or care. To reduce these problems, a robot was designed to assist the elderly in their homes. ROBIHO is an intelligent robot that has the ability to navigate in homes and monitor human daily routines. This robot is also a companion and enables communication with family, friends, health professionals and authorities. This paper presents the new social robotic system, ROBIHO and its technology.
Virtual Model of Tool Path for Milling Machine at Classical Design Base
Authors: Semjon Ján , Demeč Peter , Svetlík Jozef
Published: March 2013

This article focuses on issue of proposal ideal tool paths for machine tools. Model of machine consists from 6 basic knots where milling machine disposes spindle placed in the horizontal direction are. Based on mathematical analysis we can detect the movement of machine axes for uncertainty investigated. The calculated values can be compared with machine model developed in Computer - Aided Design. Defining the shape of workpiece as well as assigning an appropriate instrument can be determined by true value of precision workpiece. After substituting the values of specific dimensions we get the final position of vectors point for contact in tool coordinate systems at individual model solids.
Adaptation of Control System for 3D Printing Device with the Use of Hot Gas Powder Sintering
Authors: Ondrej Staš , Gondár Ernest , Tolnay Marian , Surový Peter
Published: March 2013

The article explains adaptation of control system for 3D printing device with the use of hot gas powder sintering. The work especially focuses on the use of special powder sintering, where the properties of powder material are unstable, or the printing process has to adapt the change of material volume during printing process. The main principles or main peculiarities of this system are explained, where positioning system is reacting on the material properties by algorithms creating change of control program flow of printing system generated from CAM processors.
Special Gripping Elements for Handling with Flat Objects
Authors: Horák Marcel , Novotný František
Published: March 2013

The paper analyses possibilities to use new materials having a high degree of adhesion for designing vacuum gripping elements with a view to increase the radial capacity and at the same time to preserve the compressed air consumption or the vacuum level. Structural modification of the suction cup is presented with a bearing supporting plate having a material with an adhesion layer on the contact boundary and allowing the down-pressure to be regulated depending on mechanical properties of the object kept. In conclusion the results achieved are summarized illustrating a marked increase of the radial load capacity with regard to the defined vacuum level and the degree of shifting in the contact profile compared with the standard suction cups with a similar geometrical diameter in relation to the contact surface.
A Compressible Transient Model of the Solar Chimney and Heat Collector
Authors: Li Gang , Huang Hui Lan , Zhang Hua , Liu Jian Bin , Chen Xiang
Published: March 2013

The compressible transient model of solar chimney power plant system was proposed. It was added to the pressure equation and the ideal gas state equation basis on the heat balance equation for the solar collector model. The air flow station can be easily calculated with the improved model. The results of dynamic changes of the total pressure difference calculated in the model were in good agreement with the given actual measured values in references. The solar chimney model was considered the influence of fluid pressure on the density. The influence of the structural chimney on the chimney efficiency was analyzed with the established model. It was shown that the chimney efficiency changes significantly with the chimney height and its diameter. The chimney efficiency was decreased with a convergent chimney shape while increased with the divergent one. When the tilt angle of chimney reached a peak and then further increased, the chimney efficiency was the constant. These results will provide the important reference to improving the system efficiency.
Optimization of Solar Updraft Chimneys by Nonlinear Response Analysis
Authors: Harte Reinhard , Graffmann Martin , Krätzig Wilfried B.
Published: March 2013

Solar updraft chimneys (SUCs) form as engines of solar updraft power plants tower-like shell structures of extreme height with rather thin shell walls, similar to high chimneys comprising multiple flue gas ducts. The height of pre-designed SUCs presently reaches up to 1000 m. Thus they are exposed chiefly to extreme wind-loads and thermal actions from the internal flow of warm air. As first design attempt, the structural analysis of solar chimneys generally is carried out by linear elastic models. For optimization, the typical shell-like wind stresses have to be constraint towards a more beam-like response behavior, approaching as far as possible linear stresses over the entire chimney circumference. This requires rather strong ring stiffeners, either as spoke-wheels in the designs of sbp (Schlaich Bergermann and Partners) or as external stiffeners in the designs of K&P (Krätzig and Partners). Both alternatives require considerable construction efforts leading to high investment costs. There exists an interesting simplification of this stiffening, namely applying to the SUC shell relatively soft external rings, and admitting large-widths cracking in the limit state of failure. This cracking constraints and equalizes the meridional stresses over the chimney’s cross-section, saving large amounts of reinforcement steel in the SUC. The design requires materially nonlinear analyses to verify the internal forces under crack-formations. The manuscript will derive this concept and demonstrate the crack analysis by example of a 750 m high solar chimney.
The Impact Analysis of Air Compressibility in Solar Chimney Power Station
Authors: Chen Yi Sheng , Chen Wei Hua , Pang Yun Ji
Published: March 2013

In the essay, two numerical analog study models were developed using compressible and incompressible gas models by focusing on the research of the Manzanares solar chimney power station in Spain. The simulation distributing images of air pressure, speed, temperature and density in the system were given. The comparative analysis of the results of these two models showed that in the simulation of small scale solar chimney power system the error caused by ignoring the air compressibility did not exceed 2%.
Modeling of Flyback Converter for Micro Machining Biomedical Component
Authors: Nazriah Mahmud , Yahya Azli , Kadir Mohammed Rafiq Abdul , Trias Andromeda , Nor Liyana Safura Hashim
Published: March 2013

Electrical Discharge Machining is a controlled process where pulsed electrical discharge is used to erode metal in a workpiece. A number of EDM power supplies utilizing different topologies have been widely developed for various applications. Nowadays, EDM process has been given a significant amount of research focus in manufacturing micro components with new low power topologies being utilized. Recently, a demand in micro machining has also extended into biomedical applications. In this paper a current mode flyback converter is implemented for micro machining biomedical component. A MATLAB/SIMULINK modeling technique of flyback converter is presented and the effectiveness of the flyback converter topology is evaluated through the simulation results obtained by varying the value of primary inductance
Dynast – Computer Program Used in Power Engineering
Authors: Nohacova Lucie , Nohac Karel
Published: March 2013

There are relatively insufficient quality specialized modeling tools for power engineering. Regardless there are few possibilities how to simulate main elements of electric network and systems consisting of them. Beside most used specialized tool EMTP-ATP there is MATLAB with its Simulink library SimPowerSystems and newly also DYNAST with its own growing library of power engineering elements. There are also many other general simulation tools with libraries of elements suitable for power engineering. Therefore there seems to be opportunity to compare quality of mentioned tools in accuracy, reliability, speed and flexibility in high demanding problems. Branch “Power engineering” is very specific, because there is necessary in most cases to simulate multiple technical disciplines. Not only electrical network is to solve, but also connection with mechanical equipment and other devices of power engineering. One of the most powerful tools that meet all these requirements is Dynast. Now new library for electric components was developed to make creation of model easy and fast.
Information Security Study on Innovative Power Meter System
Authors: Lin Ta Wei , Wang Fu Tung , Wu Tzong Dar
Published: March 2013

This study investigates the RFID based innovative power meter system. The system architecture and business process are improved by adopting standard complied design approach. Open Standards contributes more flexibility, more interoperability, less time consuming to our innovative system developing and play a key role for well emerging and running into global ICT infrastructures. Then a protocol framework to address security issue is provided and it make password based authentication scheme workable to enhance the security strength. RSA based digital signature methods are introduced to achieves a two-way authentication from tag to reader. Proposed protocol framework suits for power meter practical service process and offers potential to upgrade the cryptography methods for future hardware progress. It could be used as the foundation for inducing advanced technique while inspecting the information security requirements need. Our study is helpful for future power resource management system deploying and it is also valuable to address the security problem for mobile reader like RFID innovation system.
The Energy Storage System for Light Trails Applications Based on the Supercapacitors
Authors: Drabek Pavel , Streit Lubos
Published: March 2013

This paper presents research motivated by industrial demand for energy storage system for city transport vehicles. The kinetic energy is accumulated into the supercapacitor during vehicle braking. This energy can be used to accelerating in next time. It is important to save the energy in the vehicles, which accelerate very often.
PV Model with Energy Balance Equation for Commercial PV Modules
Authors: Tsai Huan Liang , Yang Chao Jia
Published: March 2013

This paper presents a novel photovoltaic (PV) model for a commercial PV module, which is augmented with an energy balance equation to simultaneously describe cell temperature and PV electricity output characteristics. Having the thermal and electrical characteristics of commercial PV module available from the manufacturer datasheet, the proposed PV model is implemented on the Simulink environment and verified under the standard test condition (STC) and nominal operating cell temperature (NOCT) condition. The NOCT verification with a commercial PV module datasheet is first addressed. Through experimental measurement of a commercial PV module in real operation from June 1 to August 31, 2011, the proposed model demonstrates the good estimation performance of both cell temperatures and output electricity characteristics. Comparing with ones of the other methods, the predicted output characteristics of the proposed model have a better agreement with the measured ones of an operating PV module.
Energy Billing System with Demand Control
Authors: Chen Meng Jen , Wu Yu Chi , Gu Chien Tsai
Published: March 2013

There are in total about 1.9 million air conditioners (ACs) in Taiwan, and during the summer time the energy consumption of these ACs is about 30% of total country energy consumption. Therefore, effective energy management of these ACs is an essential task to energy saving and carbon reduction. The purpose of this paper is thus to design and to develop an energy billing and demand control system for buildings with aggregated ACs, such as schools, company offices, factories, apartments, etc. The system presented in this paper consists of a power meter, an RFID billing reader, and a demand control module with infrared remote control and relay control. Computer GUI for supervisory control and data acquisition (SCADA) and energy management is also developed. Based on the experimental results, the demand variations of ACs indeed follow the commands sent from the presented system, and the fluctuation of the room temperature is not large during the demand control period.