bluuebunny/crossref_metadata_2025 huggingface dataset:
A Vibration and Movement Coupled Modeling Approach of 3 DOF Flexible Joint Manipulators
Authors: Zhuang Wei , Huang Yong Hua
Published: November 2011

In order to identify joint contact dynamic parameters of 3 DOF flexible joint manipulators, a vibration and movement coupled modeling approach of the manipulators was proposed. Combining the traveling wave approach of structure and the rotation transformation matrix of joint, the waveguide equations of mechanism were established. Considering the conditions of the general force balance and displacement boundary of each joint, vibration excitation of the system in moving states were obtained. Vibration equations were achieved according to the derived vibration torques and torsional vibration angles. The contact dynamic parameters of joint surface can be identified by using the vibration and movement coupled equation derived in this paper.
Design and Research of a PMLSM-Driven Elevator Door Machine
Authors: Wang Xu Dong , Ren Ning Ning , Xu Xiao Zhuo
Published: November 2011

Most of the existing elevator door driven by rotary motors, this paper used to design the permanent magnet linear synchronous motor as the Drive Fixed Motor, the door can eliminate the need of drive mechanism between the motor and the door, direct drive door in a straight line, improve reliability and security of the door machine. Through experimental analysis, the design uses DSP and Intelligent Power Module (IPM) combination of control system for elevator door operation by setting curve and stable operation.
Pyramid Histograms of Orientated Gradients for Product Image Retrieval
Authors: Jia Shi Jie , Yang Yan Ping , Zhao Jian Ying , Xiao Nan
Published: November 2011

Traditional text-based image retrieval methods are hard to meet the requirements of on-line product search. This paper applied Content Based Image Retrieval (CBIR) technologies to e-commerce field and designed a product image retrieval algorithm based on Pyramid Histograms of Orientated Gradients (PHOG) descriptor and chi-square distance. By constructing the image retrieval system, we made retrieval tests on PI100 dataset from Microsoft Research Asia. The experimental results proved the efficiency of this algorithm.
A Review of some Intelligent Optimization Algorithms Applied to Intelligent Transportation System
Authors: Zhang Li Dong , Jia Lei , Zhu Wen Xing
Published: November 2011

This paper attempts to summarize the findings of a large number of research papers concerning the application of intelligent optimization algorithms to ITS. A brief introduction to intelligence is included, for the benefit of readers unfamiliar with the techniques. Then it put emphasis on three kinds of intelligent optimization application in ITS, including ANN, GA and PSO. It should be noted first that each of the three subjects can prolong to a long paper, and second that there are also some other intelligent optimization method, such as fuzzy logic, ant colony, shuffle frog-leaping algorithm et.al.. On the constraint of time and paper volume, we only analyzed those three algorithms, their state-and-the-art use in ITS, and their future development trend.
Optimal Orthogonal Design for Herringbone Wells Injection and Production Parameters of Steam Stimulation in Heavy Oil Reservoir
Authors: Liu Yue Tian , Gu Wen Huan
Published: November 2011

Herringbone wells can effectively increase the exposed area of oil layer, increase reservoir producing degree, and extend the steam swept volume, ultimately to enhance recovery. The result of steam stimulation depends on injection-production parameters. This paper studies the six injection-production parameters including steam quality, steam injection rate, steam injection pressure, soaking time, cyclic steam injection volume and the maximum lifting rate, and considers the interaction among steam quality, steam injection rate and steam injection pressure. Using visual analysis and variance analysis to analyze the test results, the optimal combination of injection-production parameters were obtained, and the various factors were sorted according to their impact on the cumulative oil steam ratio. Research shows that the impact of interaction is not significant. The results of orthogonal numerical test can provide a theoretical guidance for herringbone wells injection-production parameter analysis optimization of steam stimulation in the field, and also have some practical significance.
A Fuzzy Compensation Control System for Underwater Vehicle Based on Kalman Filter Predictor
Authors: Tang Zhi Jie , Peng Yan , Luo Jun
Published: November 2011

This paper presents a novel control system for underwater vehicle. The underwater vehicle is affected by the inevitable surge and measurement error when working. In order to achieve reliable and quick control characteristic, this paper realize the control system by fuzzy compensation based on Kalman predictor with iterative control response. With this predictor and the control error, the fuzzy controller calculates the control compensation, and then the underwater vehicle completes a fast response control. By the control simulation, the results show that the method is effective and feasible.
Research on Reactive Power Compensation Control System Based on Dual-CPU Mode
Authors: Jiang Shao Jun , Hao Yong Chang
Published: November 2011

With the rapid development of computer, control and communications technology, Smart Grid has got a rapid development and preliminary application. Reactive power compensation system plays an important role in power supply system all the time. Therefore, reactive power compensation system is into Smart Grid, and realizes the remote monitoring, which has very important significance. This paper introduces a design model of embedded reactive compensation control system based on dual-CPU, puts forward the whole system framework, including the design of the software and hardware system. And the system adopts the fuzzy-pid control algorithm, so that the controller can satisfy the grid of reactive-power compensation required control precision and speed. In order to make the system into intelligent network, expand the Ethernet interface, the system adopts the industrial Ethernet protocol, and improves the system of remote monitoring system performance. In the system software design, using Linux and QT improves stability and scalability of system. The practical test shows that the system can be into Smart Grid, and realize the remote monitoring of system, believe that it will have broad application prospects.
Design of S-Band Oscillators by Using GaAs ED02AH 0.2-μm Technology
Authors: Najafabadi Neda Kazemy , Nemati Sare , Dousti Massoud
Published: November 2011

The S band limits from 2 to 4 GHz, is part of the electromagnetic spectrum’s microwave band. It is used by radars, satellites and some communications. This paper is concerned with the theory and design of 3 GHz feedback type and negative resistance oscillators by using Aiglent ADS software simulator with GaAs ED02AH 0.2-μm technology, and comparison of their results. A lumped element resonator has used in the design of feedback type oscillator and a negative resistance oscillator has utilized a microstrip resonator. The negative resistance oscillator operates at 3.072 GHz with phase noise levels at -99.49 dBc/Hz and -119.6 dBc/Hz at 100KHz and 1 MHz offset frequencies respectively. The phase noise levels of feedback type oscillator are -83.30 dBc/Hz and -103.3 dBc/Hz at 100KHz and 1 MHz offset at oscillation frequency of 3 GHz. Furthermore, we compared the output power of these oscillators and negative resistance oscillator showed 7.124 dBm, and feedback type oscillator presented -10.707dBm.
Microstructure and Toughness Properties of Subcritically, Intercritically and Supercritically Heat Affected Zones in X80 Microalloyed Pipeline Steel
Authors: Moeinifar Sadegh
Published: November 2011

The influence of the real and simulated thermal cycles with different secondary peak temperatures on the properties of the reheated coarse grained heat affected zone (CGHAZ) in the X80 microalloyed steel has been investigated. The four wires tandem submerged arc welding process with different heat input values was used to generate real double passes thermal cycles. The simulated thermal cycles involved heating to the first peak temperature (TP1) of 1400 °C and then reheating to different secondary peak temperatures (TP2) of 700, 800 and 900 °C with cooling rates of 3.75 and 2 °C/s. The toughness of the simulated reheated CGHAZ with different peak temperature was assessed using Charpy impact testing at 0 °C and -50 °C. It is clear that the reheated CGHAZ thermal cycles with different second peak temperatures have a significant effect on morphology of the martensite/austenite (M/A) constituent. The blocky and connected M/A constituent along the prior-austenite grain boundaries as a brittle phase for crack initiation. The Charpy impact results indicated that intercritically reheated coarse grained heat affected zone had less absorbed energy with higher transition temperature and hardness. In the same prior-austenite grain size, cycles 2 and 4 with lower cooling rate (2 °C/s) have larger size of M/A constituents. The M/A constituent size such as mean diameter and length are important factors influencing Charpy impact properties of the simulated reheated CGHAZ.
Fatigue Life Analysis of the Stabilizer Anti-Roll Bar Using ANSYS
Authors: Liu Su Hong , Li Fang
Published: November 2011

The stabilizer anti-roll bar can prevent the vehicle from rollover, so it is important to get the mechanical properties of it. To achieve it, the finite element technology is chosen and the parametric model was built in the first place. The von Mises stress distribution, reliability and the sensitivity were obtained after being analyzed respectively. Based on these, the fatigue life was estimated finally. The fatigue analysis results were contrasted with the life requirements of stabilizer bar’s endurance test.
Research of Wind Power into the Grid Based on Large-Capacity Parallel Converter Modules
Authors: Ye Fei , Yin Zhong Dong , Dai Chen Xin
Published: November 2011

The converters connected to the power grid, including rectifier and inverter. The rectifier uses DC voltage outer loop control method and the input current inner loop control method, three-phase inverter output current uses SPWM modulation. With the capacity of the system increasing, the capacity of a single converter can no longer meet the requirements, for improving the system's power grid, reliability and efficiency, converters can be paralleled. Parallel operation generates loop current; one of the effective methods of suppressing the loop current is to connect limiting inductance in the inverter AC side. Through simulation, gets the suitable inductance value, and researches the dead zone time affecting on the loop current. When the dead zone times of two modules are not equal, the loop current increases.
Fuzzy Adaptive Control of Airborne Electro-Optical Tracking Systems Based on Variable Universe
Authors: Gao Song , Xu Xiao Xia , Xiao Qinkun , Pan Quan
Published: November 2011

In order to improve the control performance of airborne EO tracking systems, we develop a proposed variable universe control algorithm based on fuzzy reasoning. The algorithm combines a new fuzzy control algorithm with classic PID control algorithm and greatly improves the dynamic performance of the airborne EO tracking systems. The simulation results indicate that the adaptive fuzzy controller can ensure the precision of the system with better adaptability and robustness.
Wireless Power Transfer Systems via Strong Coupled Magnetic Resonances — Design, PCB Implementation and Tests
Authors: Yao Yan Ping , Zhang Hong Yan , Geng Zheng
Published: November 2011

In this paper, we present theoretical analysis and detailed design of a class of wireless power transfer (WPT) systems based on strong coupled magnetic resonances. We established the strong coupled resonance conditions for practically implementable WPT systems. We investigated the effects of non-ideal conditions presented in most practical systems on power transfer efficiency and proposed solutions to deal with these problems. We carried out a design of WPT system by using PCB (Printed Circuit Board) antenna pair, which showed strong coupled magnetic resonances. The innovations of our design include: (1) a new coil winding pattern for resonant coils that achieves a compact space volume, (2) fabrication of resonant coils on PCBs, and (3) integration of the entire system on a pair of PCBs. Extensive experiments were performed and experimental results showed that our WPT system setup achieved a guaranteed power transfer efficiency 14% over a distance of two times characteristic length(44cm). The wireless power transfer efficiency in this PCB based experimental system was sufficiently high to lighten up a LED with a signal generator.
Performance Analysis for Elliptical Tube Longitudinal Vortex Generators
Authors: Zhou Jun Jie , Wu Xue Hong , Li Xiao Qian , Huang Jin Yin , Wang Ding Biao
Published: November 2011

In this paper, three-dimensional numerical simulation is conducted on the flow and heat transfer process for elliptical tube heat exchanger with rectangular vortex generators and triangular vortex generator by Fluent software, respectively, and the performance for elliptical tube heat exchanger with plate fin is compared. The results show that the Nusselt number increases with the increase in Reynolds number for the inlet velocity range from 1 to 5m/s, friction coefficient decreases with the increase in Reynolds number; at the same Reynolds number, Nusselt number for fin with Vortex Generators and friction coefficient are higher than that of elliptical tube with plate fin ; the vortex generator shape and angle of attack have a great impact on the comprehensive performance within a simulated attack angle and the velocity, at the same pump power, the comprehensive performance for heat exchanger with the rectangular vortex generator increase up to 10%.
Characteristic Analysis of Ceiling Radiant Heating of Capillary Tube
Authors: Weng Wen Bing , Yu Jing , Zhang Tai Kang
Published: November 2011

A capillary tube air-conditioning system was designed after presenting the design method of the cold and heat source, water system, fresh air system, control system. In the paper, the experimental method was employed to study the change and distribution of indoor-air temperature, and the response of capillary tube mat surface temperature, while the computational method was employed to analysis the tube mat radiant heat transfer and convective heat transfer. It is concluded that, the indoor temperature rose faster and the uniformity of indoor temperature distribution was better when ceiling radiant heating of capillary tube was adopted.
Study of the Pressure Distribution between the Piston Rings in Reciprocating Compressors
Authors: Xin Dian Bo , Feng Jian Mei , Xu Yan Jing , Peng Xue Yuan
Published: November 2011

Piston ring is one of the most important sealing components that can be easily damaged in reciprocating compressors. The severe non-uniformity of the pressure distribution was suggested to be the essential reason for the premature failure of the piston rings. Therefore, a test rig was set up to measure the pressure distributions as well as the build-up of the dynamic pressure difference, which could reveal the root cause for the non-uniformity of the pressure distributions. The results showed that the build-ups of the pressure differences between different rings were not simultaneous; there existed a threshold pressure, and the latter ring could work only when the pressure before the former ring reached to the threshold value. The pressure distributions were also investigated at the start-up and shut-down of the compressor, which further validated the cause of the premature failure of the first ring.
Influence of Packing form on Performance of Electrodeionization Process for Removal Ni2+ from Synthetic Wastewater
Authors: Lu Hui Xia , Wang Jian You , Bu Shao Feng
Published: November 2011

The purpose of this study was to investigate the influence of packing form on the performance of electrodeionization (EDI) process for removal Ni2+ from synthetic wastewater. With feed water containing about 50mg•L-1 Ni2+ at pH of 5.7, the dilute resistivity of the product stream with mixed bed and layered bed were in the range of 1.41-1.72MΩ•cm and 1.08-1.27MΩ•cm, respectively. The precipitation of metal hydroxide could be reduced effectively by using layered bed. With optimum operating conditions, the wastewater containing Ni2+ could be purified and be reused by EDI process.
Effects of Engine Operating Parameters on Lean Combustion Limit of Hydrogen Enhanced Natural Gas Engine
Authors: Wang Xin , Zhang Hong Guang , Lei Yan , Bai Xiao Lei , Sun Xiao Na , Wang Dao Jing , Yao Bao Feng
Published: November 2011

An experimental study was conducted on a S.I. engine fueled by compressed natural gas and hydrogen blends (HCNG), in order to test different engine operating parameters that affect lean combustion limit (L.C.L) of HCNG engine. Firstly, constant ignition timing and ignition timing under maximum L.C.L (L.L.T) conditions were compared, then L.L.T conditions were adopted in this paper. The results indicated that for each condition, neither over-retarded nor over-advanced ignition timing are advised in order to achieve leaner combustion. L.C.L increases with hydrogen fraction in the blends, and slightly increases with throttle opening, while decreases when the engine speed is raised
Experimental Study of Cooling Tower Packing and Deduce the New Formula of the NTU
Authors: Chen Jian Bo , Shi Yin Hao , Wang Yin Hua , Hou Hong Li , Li De Xing
Published: November 2011

As the main heat exchanger for cooling tower, the performance of cooling tower packing will directly affect the cooling effect of the cooling tower. So it is important to develop the new cooling tower packing and test the performance. In this paper, the empirical formula of the new ramp-type packing was deduced based on an experimental study of packing performance. And the author analyse the factor affecting the number of transfer units(NTU) find that the NTU is not only related to gas-water ratio. According to the experimental study, the author deduced the new formula of the NTU and verified that the new formula of NTU is more accurate than the traditional formula Within a certain range of parameters.
Laser Scanner Stage Synchronization Method for Ultrafast and Wide Area Fabrication
Authors: Kim Kyung Han , Yoon Kwang Ho , Lee Jae Hoon , Suh Jeong , Kim Jong Soo
Published: November 2011

This paper presents an on-the-fly method to synchronize a laser scanner and a linear stage for fast and wide area fabrication. Demands for high-precision laser processing with wide area have been increasing for a number of applications such as in solar cell batteries, display parts, electronic components, and the automobile industry. An ultra high-speed laser scanner system is limited by its size of scanning area, for example, its scanning area is only 50 × 50 mm2. Recently, a laser scanner system that could scan a wide area was developed; however, it was found that the scanning quality of this scanner decreased with an increase in the scanning area. The developed method is different from the existing step and scanning method in that it our method ensures continuous stage movement, which may improve the processing speed and in turn the laser fabrication quality.
Optical Power Optimization of the Single Mode Vertical Cavity Surface Emitting Lasers by Two Oxide Layers
Authors: Yazdanypoor Mohamad , Gholami Asghar
Published: November 2011

Influence of using two oxide layers in the both sides of active layer with different position and aperture size on Vertical Cavity Surface Emitting Laser (VCSEL) performance is analyzed showing effects on the output power, single mode operation and threshold current. In addition, for improving speed we use ion implant area along with thick oxide layer to minimize parasitic elements. As the result, the proposed design exhibits much better stability of the fundamental mode over a wider current range, much higher output power, lower threshold current, than the conventional one with a high frequency response.
Trajectory Tracking of a Spherical Robot Based on an RBF Neural Network
Authors: Zheng Ming Hui , Zhan Qiang , Liu Jin Kun , Cai Yao
Published: November 2011

This paper deals with trajectory tracking problem of a spherical mobile robot, BHQ-1. First, a desired velocity is obtained by proposing a PD controller based on the kinematics. Then a PD controller with an RBF (Radial Basis Function) neural network is proposed based on the desired velocity and the inexact dynamics. The weights of the RBF network are designed with an adaptive rule based on the tracking error, and hence the network can compensate the uncertainties of the dynamics more effectively. Stability is presented via Lyapunov Theory and simulation results are provided to illustrate the tracking performance.
Single-Frequency Nd:YVO4 Green Laser Using Two Brewster Plate
Authors: Liu Xiao Juan , Fu Sheng Gui , Ge Xiao Lu , Han Ke Zhen
Published: November 2011

A pulse laser-diode-array (LDA)-pumped, intracavity frequency-doubled Nd: YVO4 laser has been demonstrated. An birefringent filter consisting of a KTP crystal and two Brewster plates(BP) has been used in the system to realize single-frequency output. Up to 72.4 mW average output power is obtained for 800 mW pumping power with an optical-to-optical conversion efficiency of 9.1%. The maximum peak power of the single-frequency green laser is 22.3 W with the pulse width 162μs.
Nondestructive Testing Analysis of Reinforced Protective Cover Thickness
Authors: Jiang Ying Bo , Chen Wei
Published: November 2011

The thickness of concrete protector is related to bearing resistance, endurance and fireproof property of concrete structure, The standard stipulates that structure tesand fireproof property of concrete structure, the standard stipulates that structure test must including the thickness of concrete protector. The article is trying to analyse performance and precision of KON-RBL concrete protector testing instrument, finding the regression equations, precision of KON-RBL concrete protector testing instrument, finding the regression equations, than trying to verify in engineering practice.
Improving Equipment Effectiveness by Designing Optimal Production Process
Authors: Okhovat Mohammad Amin , Nehzati Taravatsadat , Pouriran Amin , Fakhar Shahriar , Ariffin Mohd Khairol Anuar Mohd
Published: November 2011

Reliable manufacturing equipment is an indispensable factor to the performance and proﬁtability of manufacturing systems. Total productive maintenance (TPM) has been recognized as a comprehensive manufacturing strategy to maximize equipment reliability and effectiveness through rooting out all manufacturing losses. Availability of equipment is a focus area in TPM to improve effectiveness throughout the lifetime of the equipment. This study develops a mixed integer linear programming model to increase equipment availability considering maintenance cost of each machine in the system. The main objective is minimizing total cost while designing optimal material flows between different operational levels of manufacturing process. A hypothetical problem is presented and solved by the developed model.
Numerical Simulation of Failure of Overburden in Coal Mining under Reservoir
Authors: Wang Zhong Chang , Zhao De Shen
Published: November 2011

The Water-flowing fractured zone’s height and its distribution has an important effect on stability of the surrounding rock and the safety in the subsequent production under reservoir. In the paper the Drucker-Prager yielding law is used. The limit value of tensile stress and shear stress is used to judge the water-flowing fractured zone’s height and its distribution. The fitting formula is obtained by origin software under different advance of the work face. The peak value of horizontal movement is 1.13m. The symmetrical subsidence basin is formed in the center of work face. The peak value of subsidence is 3.86m. The sum of surface subsidence accounts for about 43 percent of the mining height. The advance of around 300m is the distance that the water flowing fractured zone’s height reaches the highest value. The biggest height of water- flowing fractured zone is 146m.
Limiting Power of High Power Microwave Pulses from Aperture
Authors: Zhang Jian Hua , Hu Wei
Published: November 2011

Based on the field equivalence principle and the potential function, the axial normalized pulsed power density of the microwave radiated from the circle aperture antenna was deduced. The power density in the Fresnel region was calculated for uniform aperture and tapered one. The relations between the aperture antenna’s maximum power and the parameters including pulse width, aperture radius and the center frequency were analyzed. The formula of the antenna’s maximum power limited by the air breakdown due to high power microwave is presented.
An Improved Design of Controller for Medium Frequency Induction Power
Authors: Zhang Zheng , Liu Xiao Wei , Jiang Min , Wan Guo Cheng
Published: November 2011

Present a variety of advanced PID control algorithm in the use of induction heating power supply is increasingly broad, achieving good results in self-tuning of PID parameters. However, most of the output of PID control value is a single volume, such as DC power regulator for controlling the output voltage of rectifier or inverter power regulator for controlling the output frequency of inverter current. It has achieved a certain effect in the heat treatment process control, but did not take into account the actual efficiency of the power. The two adjustments will be combined in this article, using Smith prediction control algorithm and methods based on the Ziegler-Nichols PID tuning algorithm for time delay system. Both of the raising of induction power efficiency and lower system energy consumption has been achieved.
Study of Process Industries Strategic Environmental Assessment Matrix Model Methodology Based on the Decision-Making Integrated
Authors: Qian Hong Wei , Yin Xiang Ju
Published: November 2011

Process industries strategic environmental assessment (PISEA) involves some industry, is an extremely complicated system, it is difficult or impossible to been full studied by a single approach, and must rely on a comprehensive, sound methodology. Base on the traditional method of environmental impact assessment, policy science assessment and system integration, combining with practical industry background, presenting an decision-making integration methodology. On this basis, constructing methodology of PISEA matrix model based on the integration of Decision-making. The study results show that the matrix methodology will integrate the processes of PISEA and strategy development, reflecting the guidance of PISEA methodology supporting decision-making.
Research on Structure Design and Performance Test of Electromagnetic Shielding Clothes
Authors: Li Yan , Zhang Wen Bin
Published: November 2011

Based on the theory analysis of electromagnetic shielding mechanism and structure design, a woven fabric with stainless steel core-spun yarns is selected. Several sets of shielding clothes with variable structure parameters are designed and manufactured through orthogonal experiment method. An experimental platform has been set up to measure the shielding efficiency of the shielding clothes in key parts. With direct and variance analysis identify the significant structure parameters which influence the shielding performance, so as to provide a theory basis for the optimization structure design of electromagnetic shielding clothes.
The Pure Heat Conversion Coefficient Analysis Method for Thermodynamic System of Advance Boiling Water Reactor Nuclear Power Unit
Authors: Guo Zhong De , Zhang Shu Fang
Published: November 2011

Pure heat conversion coefficient, which is one important parameter for the advance boiling water reactor nuclear power unit, is defined, and the coefficient reflects energy grade values of heaters. According to the structural characteristics of the thermodynamic system of the advanced boiling water reactor nuclear power plant, four sorts of auxiliary steam-water components are categorized. Via strict deduction and demonstration, the general matrix of the coefficient is deduced, so the thermal economic analysis of advance boiling water reactor nuclear power unit can be done with one of extraction steam efficiency. In this way, a new method of thermal economic quantitative analysis for this unit is offered.
Study on the Response of Stud Shear Connectors Subjected to Different Loading Rate
Authors: Mu Zai Gen , Li Xiang Jie , Zhang Ju Bing
Published: November 2011

Loading rate has an effect on the low-cycle fatigue of the stud shear connector. A reasonable test have been used for the study, the results show that, number of cycle and the maximum slip are obviously different at the rate of 1Hz, 3Hz, 5Hz, but the difference are not in linear with the rate. Moreover, the fitting parameters of the Load-Slip curves follow certain laws.
The Resource Characteristics of Marine Gas Hydrates and the Assessment of its Exploitation Technology
Authors: Zhang Zhen Guo , Zhang Ying , Gao Lian Feng
Published: November 2011

Gas hydrate is a new energy in the 21st century with the characteristics of high energy density, huge amount of resources and cleaning. It has important significances for resources development, environmental protection and global climate changing. Due to the limitations of the occurrence mode and the technical level of marine gas hydrates, at present, the development and utilization of the resources are still tentative. This article analyzed and evaluated several key technologies to develop marine gas hydrates, that is depressurization, thermal methods, chemical injection method, CO2 replacement method, and fluorine gas+microwave method.
Study on VAV Temperature Fuzzy Controllers with Self-Tuning Parameters and Variable Universe
Authors: He Hong Zhou , Yang Shao Hui
Published: November 2011

VAV air-conditioning system has the characters of nonlinear and non-stationary under the influence of many factors, so it is hard to tune the parameters of the fuzzy control system. According to the structure and operation principle of VAV air-conditioning system, the monitoring system has been developed. The conventional fuzzy control algorithm, temperature self-tuning parameters fuzzy control algorithm and variable universe adaptive fuzzy control algorithm were researched in the system. The relationship between the scale factors and several main performance indexes of the system's respond curve like overshoot, steady-state error and transient time has been analyzed. The experiments results indicate that the variable universe fuzzy control algorithm can improve the performance of the fuzzy controlle, the combination property index decreases over 17%. The algorithm is feasible to use it on line since it is simple and need few system resources.
Research on Construction Safety Evaluation Based on Fuzzy-Set Pair Analysis Model
Authors: Huang Guo Zhong , Wu Zhong Guang , Yang Can Sheng , Liu Hui
Published: November 2011

Given factors influencing construction safety has characteristics of fuzziness and uncertainty, an evaluation model based on Fuzzy-Set Pair Analysis is put forward, which combines advantages of fuzzy comprehensive analysis method and set pair analysis method. According to characteristics of construction, the construction safety evaluation index system is constructed, the weight of each index is determined by Interval Analytic Hierarchy Process （IAHP） and connection degree is calculated, so the safety condition development and uncertainty rank of evaluated construction sites are calculated. It is shown that the model can deal with certainty and uncertainty of information in safety evaluation at the same time, thus good results can be obtained through application of the model.
CFD Simulation and Retrofit of Natural Ventilation in a Steel Workshop
Authors: Su Ya Xin , Wan Xin
Published: November 2011

Natural ventilation in an workshop of iron and steel company has been numerically simulated by computational fluid dynamics (CFD) method. Realizable k −ε turbulent model combined with a DO radiation model which took into account the radiation between the heat source and the wall was applied to carry out the simulation for a typical industrial workshop. Numerical results were verified by published experimental data of local temperature and further modification of the workshop structure was made based on numerical calculation to improve the natural ventilation effect further.
Development of the Performance Testing System for Radio Fuze
Authors: Chen Ya Zhou , Lin Wang
Published: November 2011

To assure the security and reliability of radio fuze, its performance must be test. A performance test system of radio fuze is developed, which is based on the theory of the pushing plate method according to the performance indexes written in the national military standard. The testing system which is composed of dipole antenna, frequency meter, multimeter and oscilloscope can test the main performance parameters of radio fuze. It is proved that the testing system can carry out the performance test of radio fuze steadily.
Analysis and Optimization of ORC for Low-Temperature Waste Heat Power Generation
Authors: Ma Xin Ling , Meng Xiang Rui , Wei Xin Li , Chang Jia , Li Hui
Published: November 2011

This paper presents energy analysis, thermodynamic calculation and exergy analysis for waste heat power generation system of Organic Rankine Cycle based on the first and second laws of thermodynamics. In order to improve system performance, for low-temperature waste heat of 120°C and R245fa organic working fluid, using Aspen Plus software conducted simulation, optimization and improvement. Results from these analyses show that decreasing the expander inlet temperature, increasing inlet pressure of the expander, and adding regenerative heater can increase thermal and exergy efficiencies, at the same time reduce system irreversibility.
The Simulation Study on Buried Ground-Source Heat Pipe Transient Temperature Field Distribution
Authors: Guan Chang Sheng , Wan Zhao
Published: November 2011

In order to provides the theory basis for the optimization design of ground source heat pump underground U-shaped buried tube, ANSYS software was used to simulate the temperature field distribution of GSHP buried tube summer cooling process. The dynamic simulation was base on analyzing the GSHP heat exchanger unsteady heat transfer model. Comparing the temperature field distribution radius in different soil heat transfer rate, the simulation results show that the buried tube heat transfer efficiency increases with soil coefficient of thermal conductivity, soil hot effect radius increased over time and tend to be gentle.
Random Heat Temperature Field Model Analysis on Buried Pipe of Ground Source Heat Pump
Authors: Huang Cheng Ju , Guan Chang Sheng , Xia Kai
Published: November 2011

The random properties on buried pipe of ground-source heat pump (GSHP) is analyzed, the equation of Kelvin one-dimensional line source of heat transfer model is discussed. The model randomness is analyzed also, and the GSHP buried pipe to random excess temperature field, space-time statistics and the correlation of features are studied. The engineering example shows that heat transfer in buried pipe has relationship with the distance from the pipe center and run time of the system, and also the heat transfer between buried pipes can not be ignored. The method in this paper has great significance for improving the reliability design theory and reducing the construction cost of GSHP buried pipe in this paper.
An Intelligent Process Model for Manufacturing System Optimization
Authors: Hoe Ho Kok , Muthusamy Kanesan , Kanthen Harikrishnan
Published: November 2011

The paper aims to develop an intelligent modeling system using Microsoft Excel spreadsheet interface through mathematical language, mathematical reasoning and algorithms flow chart technique for manufacturing system optimization without human involvement. The paper begins to search for a mathematical theorem which is arithmetic series to represent a dynamic manufacturing system in a production floor using production time variable through numerical analysis and is validated using software simulation. The mathematical theorem is modeled with Industrial Engineering (IE) variables into spreadsheet to perform intelligent decision making. The model sets inventory target variable to be achieved with automated computation through the data input from users. Manual analysis from human can be transposed to mathematical language in order automate the system intelligently. The building of intelligent modeling system into spreadsheet using mathematical language sets a new platform for researchers to promote the next generation of modeling technique in the manufacturing field.
Kinematic Modeling and Analysis of a Multifingered Robotic Hand
Authors: Parida P.K. , Biswal Bibhuti Bhusan , Khan M. R.
Published: November 2011

Precise and secure handling of flexible or irregularly shaped objects by robotic hands has become a challenge. Robot hands used in medical robotics and rehabilitation robotics need to be anthropomorphic to do the desired tasks. Although it is possible to develop robotic hands which can be very closely mapped to human hands, it is sometimes poses several problems due to control, manufacturing and economic reasons. The present work aims at designing and developing a robotic hand with five fingers for manipulation of objects. The kinematic modeling and its analysis, as a part of the development process is presented in this paper. The simulation results of the hand shows that the conceptualized design is yielding the desired result and works very efficiently.
Study of Effect of Geometry Parameters on Piezoelectric Cantilever by Modal and Harmonic Analysis
Authors: Khalatkar Abhay M , Gupta V.K. , Haldkar Rakesh Kumar
Published: November 2011

In this study a Finite Element Analysis for cantilever plate structure excited by proof mass is presented. To investigate the influence of different geometry parameters like thickness, length and width on the maximum deflection and resonance frequency. Configuration of piezoelectric actuators attached to the plate structure in order to identify the optimal configuration of the actuators for selective excitation of the mode shapes of the cantilever plate structure. The Finite Element Modeling based on ANSYS12.0 package using modal analysis and harmonic analysis is used in this study for cantilever plate structure excited by patch type of piezoelectric plates of PZT-5H4E of different geometrical parameters like thickness, length & width on the cantilever beam. To study the maximum deflection , the readings are taken by varying different geometry parameters . With this different geometrical parameters first modal analysis is done to know the different modes shapes and their natural frequencies and the frequency of particular mode shape at which the deflection is maximum. Then in the second stapes Harmonic Analysis is carried out near same frequency and the deflection amplitude is found out. Thus simulation of a cantilever beam is done by varying different thickness of piezoelectric plates and the substrate material. The same simulation is carried for different lengths’ & width. Finally the results are combine presented on graph , which clearly shows the effect of variation of geometry parameters on the beam deflections and accordingly change in natural frequency.
Diesel Engine Maintenance System, Using Trend Analysis of Histroical Data (Case Study)
Authors: Sayyah Ali , Nikbakht Mehrdad , Sayyah Moones , Btht Baharudin , Ismail N.
Published: November 2011

Contaminant materials in lubricants are signs for prediction and measurement of wear in engines. Therefore oil monitoring is considered as one of the most effective techniques for maintaining the heavy equipments. However based on oil analysis data, the identification of engine problem is very hard due to different contribution factors. Hence, this paper is purposed to analyze the wear behavior of some sets of selected heavy equipment engine based on documented oil analysis data during two years in different conditions to track engine failures using trend analysis. Furthermore the selected equipments are divided into two major groups (plantation and forestry, and general construction) based on their environment, to show the effects of conditions on the engine wear behavior.
Effective Variation Analysis Model for the Riveting Press Process of a Flush Rivet
Authors: Zhang Jun , Li Yuan , Cheng Hui , Zhang Kai Fu
Published: November 2011

Most of the fatigue damage in aircraft structures can be linked to the stress concentration arising at the rivet joints. Interference-fit riveting of a flush rivet can form the uniform interference fit. Thanks to the uniform interference fit, large stress concentration can be avoided. The radial deformation, which is directly relative to interference fit, is therefore of prime importance. Parameters associated with a riveting process that directly affect the quality of rivets must be taken into account to observe the effect on radial deformation at rivet holes. This paper presents an effective variation analysis to calculate radial deformation at rivet holes by assuming that the axial stresses are constant both along the axial and radius of the rivet slug. Firstly, the rivet process model is built before variation analysis. Secondly, theoretical relationships between radial deformations and contact loads are proposed using elasto-plastic analysis. Later, the expressions of the contact loads are given according to geometrical relationships and analysis of deforming forces. Thirdly, an instance made up of the rivet, top sheet and bottom sheet is used to verify the analysis model. The model paves an efficient way to study the deforming law of the riveting press process and build the pre-estimate model of the rivet deformations and the parameter optimization model.
Research on 3D Modelling and Forming Simulation of Metal Wire
Authors: Chen Ming Hui , Yao Bin , Lin Rong Kun , Lu Ru Sheng
Published: November 2011

Based on features of any shape of wire with complex geometric patterns, a method for modelling 3D wire is proposed, and the machining simulation of the 3D wire and collision detection between the wire and the machine are introduced. By using double buffering technology, we obtain smooth animation during the off-line machining simulation. The computational cost of a collision detection algorithm is decided not only by the complexity of the basic interference test used, but also by the number of times every test is applied. To simplify the collision detection algorithm, an approximate method of representing wire model and machine model by using line segments and planes is applied.
Generation Shedding and Load Shedding Based on Transient Energy Margin Sensitivity
Authors: Zhang Ke , Lin Lin
Published: November 2011

This paper proposes a method for calculating generation shedding and load shedding in the emergency control of power system. The method is based on the theory of transient energy margin sensitivity, combining with the power flow distribution factor technology. It gives generation shedding and load shedding fast and efficiently. The simulation result proves that the method developed is feasible for the construction of emergency control strategy.
Research on MEMS Phthalocyanine-Based Gas Sensor
Authors: Liu Xin
Published: November 2011

A gas sensor based on MEMS (microelectro-machine system) has been developed to provide a sensitive means of detecting nitrogen dioxide. The structure, configuration and fabrication steps were described. The sensor was copper phthalocyanine (CuPc) films which caused a resistance change upon exposure to nitrogen dioxide. The sensor demonstrated a good response and recovery time about 4s and 7s separately. Results also indicate to be accordance with the sensitive mechanism of CuPc in terms of semiconductor theory.
Research on Stator Winding Leakage Reactance Calculation of Double-Winding AC-DC Generator
Authors: Wu Xu Sheng , Gao Wei
Published: November 2011

Double-winding AC-DC Generator are being widely used in self-contained electrical power systems for their obvious virtues. On their stator, two separate windings are distributed, one three-phase winding delivers AC power and the other twelve-phase winding, termed DC windings, are connected to the bridge rectifier to supply DC power. Unlike ordinary three-phase machines, there are four layers winding in each stator slot of the Double-winding AC-DC Generator and the total gap magnetic potential produced by the twelve-phase winding is more complex than 3-phase machines. By analyzing the leakage magnetic flux and the magnetic potential, relevant formulas are derived to calculate the leakage reactance of the machines. All the stator leakage reactance of a realistic Double-winding AC-DC Generator was calculated through the methods presented and the simulation of a sudden shortcut test of the machine was carried out with the parameters calculated. The simulation and test results agree quite well, and show that the formulas presented are correct.
Research of Waveguide-Stripline-Coaxial Line Direction Coupler
Authors: Shi De Wan , Li Jun
Published: November 2011

The expression of calculation of the waveguide-stripling-coaxial line directional coupler, Coupling is through small apertures in the form of a circular hole, is derived. The relationships between Technology parameters with the geometric of the directional coupler are analyzed in detail, the numerical results indicate that, in order to get acceptable of coupling coefficient and directivity, ones may not only change the size of the small hole and rotate the probe in the waveguide - waveguide directional coupler, but also the size of stripline as well as the coupler position.
Novel Flowrate Sensor Based on a Couple of Fiber Bragg Gratings
Authors: Yang Shu Lian , Li Tian Ze , Li Zhen Mei , Tan Bo Xue , Zhao Kai
Published: November 2011

A novel flowrate sensor based on a couple of fiber Bragg gratings( FBGs) has been proposed, consisting of fiber grating pressure sensing setup and Venturi tube. The expression of relationship between the flowrate and the wavelength shift difference of the FBGs is derived. The pressure that two sides of the cross section of the aluminum foil tube in the pressure sensing setup results in the distortion of an isosceles triangle cantilever structure. The distortion results in the wavelength shift of a couple of FBGs that are mounted at either side of the cantilever. By monitoring the wavelength shift difference of the two FBGs, the flowrate can be obtained. The cross-sensitive problem of the FBGs sensor can be solved by compensating the temperature effect. The preliminary experiments have been carried out, and the results verify the feasibility of the proposed sensor with a measurement range from 8 to 200 mm/s.
A LCD Touch Screen Controller Based on LPC2138
Authors: Gao Jing , Zhu Lian Qing , Guo Yang Kuan , Meng Hao
Published: November 2011

The user interface made of a LCD (liquid crystal display) screen and a touch screen based on LPC2138 is presented in this paper. The hardware design of the LCD and the touch screen is introduced and the software flow of the LCD and the touch screen is also described in this paper. And this paper proposes the synchronization algorithm which can achieve the LCD and the touch screen point by point with high accuracy and great reliability. On the basis of analyzing the principle of the embedded touch panel system, the working principle and control method of the dedicated controller DV320240GB touch screen are analyzed. The method for obtaining the coordinates of the touch screen and the synchronization algorithm of the LCD display are proposed to improve the efficiency of the touch screen and the LCD. The above-mentioned design has been successfully applied in ESR (erythrocyte sedimentation rate) detection system.