bluuebunny/crossref_metadata_2025 huggingface dataset:
Study about the Recycled Construction Wastes for Landscape Design
Authors: Lin Mo Fei , Chen Yan
Published: November 2012

In recent years, there were plenty of construction wastes coming with the expanding of urban built-up areas and the progress of urban redevelopment. Consequently, how to renew and recycle the construction wastes becomes more and more important. Aiming at the causes and characteristics of various construction wastes, this paper advocates that landscape design may be used to solve this problem. Based on the current development about some treatments for the construction wastes in the world, it presents an effective recycling approach by using the wastes as landscape materials to re-discover the construction wastes’ values in environment, economy and society. Furthermore, four principles for this kind of recycling in the whole design process should be followed well, i.e. hommization, functionality, aesthetic and innovation. This paper also provides the direct and circular design methods, and illustrates the detailed practices, in order to offer new thinking for the materials application of landscape design.
Study on the Evaluation of Urban Industrial Land Intensive Use
Authors: Lu Zhen Hua , Zhang Jun Lian , Li Xian Wen , Wang Xiu Lian , Bai Xiao Fei , Zhang Jia
Published: November 2012

With the Comprehensive database of industrial land, the paper taken Hefei district as study area and taking Administrative regions as evaluation Unit, evaluated and analyzed the status of urban industrial land intensive use, the main steps of the research are: construct evaluating indicator system based on the scale, structure, intensity and layout; constitute criteria according to contents of the indicator system; construct evaluation model; put data of Hefei and criteria into the evaluation model and obtain the evaluating result about the intensive utilization of industrial land in Hefei; analyze the result to find problems and based on the problems in the industrial land use in Hefei, improving region industrial land intensive use suggestions were put forward in this paper to provide reference for region industrial land intensive use control Policy-making.
Implementing a New Urbanization Strategy, Enhancing Tai’an’s Tourist Soft Power and Quickening Economic Development
Authors: Han Su , Han Xiao Feng
Published: November 2012

It is known to a lot of people that the great superiority of Tai’an City lies in Mount Tai which is very famous both in China and around the world. Tourism has become the pillar industry in the development of Tai’an City’s economy and society. It is an important step for Tai’an Municipal Party Committee and Tai’an Municipal Government to decide to implement a new urbanization strategy in Tai’an City and enhance its tourist soft power so as to attract more Chinese and foreign visitors and quicken its economic and social development. In this paper, combined with the reality of Tai’an City, the authors put forward the personal viewpoints and make some concrete suggestions which will be beneficial to achieve the above objective.
The Freeway Energy Conservation and Emission Reduction Guarantee System Research
Authors: Li Zi Qiang , Li Zheng
Published: November 2012

This paper uses the latest highway design theory and method of energy conservation and emission reduction to elaborate the freeway energy conservation and emission reduction. According to this, we protocol detailed freeway energy management organization settings, staffing and framework. Then we introduce the concept of energy conservation and emission reduction and promote the application new technology, materials and equipment in the freeway design and construction stages, so as to establish a more comprehensive freeway energy conservation and emission reduction technology guarantee system, it also provides the policy guarantee in order to further the effective containment of the rising road transport energy consumption. This paper conducts a comprehensive analysis and discussion on the guarantee system of energy conservation and emission reduction through the two aspects.
Design of High Frequency Program-Controlled Filter
Authors: Lan Qiao Qian , Xu Min Hui , Jin Wei Jian
Published: November 2012

In order to meet the requirements of most controllable filters of the high frequency of the system , this paper introduces a kind of programmable filter designing based on MAX262, and discuss the method of realizing , in the case of full comprehending the theory of filers, using Multisim to simulate. Analysing the simulation results of the output, it shows that this scheme of filter designing is good, the center frequency and the storage factor Q can be programmed to control ,in order to apply to varieties of frequency band filtering in signal detection.
FEM Modeling Technology and Vibration Analysis of Flexible Rotor System
Authors: Liang Zhi Chao , Hong Jie , Ma Yan Hong , He Tian Yuan
Published: November 2012

The low-pressure spool in a high-bypass ratio turbofan engine has its unique characteristics. The slightness rotor and the large lumped mass in blade and disk are the structural characteristics while the dynamic coupling between bladed-disk and shaft is the mechanical characteristic. This paper studies on the modeling technology of a flexible rotor system based on the finite element method (FEM). The equivalent-disk method, an equivalent principle of finite element modeling, is put forward. The blades are equivalent to a disk which can not only retain the structural and mechanical characteristics but also control the scale of the model and convert the periodic geometry into axisymmetric geometry. The results show that the equivalent-disk method is helpful to improve the modeling techniques of rotor system and can be used in engineering.
Numerical Analysis for Galloping of Iced Quad Bundle Conductors
Authors: Cai Jun Yan , Liu Xi Jun , Zhang Su Xia
Published: November 2012

In order to attain the purpose of anti-galloping, a simplified model for iced quad bundle conductors of three degrees of freedom in vertical, horizontal and torsional directions is established by means of the Hamilton principle, in which the effect of spacers stiffness and damping is considered. Based on the model, the influence of related parameters such as fluid density, damping ratio on conductor galloping amplitude and critical wind velocity is analyzed. Simultaneously, the relation curve between elastic property of spacers and conductor galloping is obtained. The results indicate that the conductor galloping can be weakened to some degree with the proper enlargement of damping ratio, the reasonable setting of spring stiffness on spacers and the avoidance of areas such as the wind outlet and windward as much as possible when choosing the line path and so on.
A Detection Technology for Weak Vibration Signal Based on Independent Component Analysis
Authors: Guo Hai Dong , Li Shun Ming , Zhang Yuan Yuan , Wang Xing Xing , Ma Sai
Published: November 2012

For weak vibration signal with strong noise, a new kind of weak vibration signal detection method was proposed in this paper. Based on the redundancy reducing capability and the uncertain amplitude of independent component analysis, virtual noise was introduced to extend the dimension of original observed signal after we analyzed the prior features of noises in observed signal. Then extended signals were processed to get the independent source signals by applying to blind source separation (BSS). Thus, the noise embedded in observed signal was removed and characteristics of weak vibration signal were obtained successfully. Through the theoretical analysis and the simulation, the introduced method of this paper was checked to be available and then it was applied to faults analysis of rotor misalignment successfully. Finally, we made a conclusion that this method had great application value for the extraction of weak vibration signal.
Natural Vibration Period Analysis of Multi-Storey Reinforced Concrete Frame Structure
Authors: Hao Li Na , Zhang Yong Sheng
Published: November 2012

Field measurements of dynamic characteristics of the multi-storey reinforced concrete frame structure buildings were carried out, by using the ambient vibration test technique, and structural modal parameters were extracted. The measured results and calculated results in accordance with current design specifications were compared. Results show that for multi-storey reinforced concrete frame structure, the measured vibration period of structure is close to the natural period calculated in accordance with the empirical formula of the “Load Code for the Design of Building Structures”. In the actual project, when the designer calculate the natural period if considering only the quality of the infill walls, without considering the stiffness of the infill walls, the period should be shortened. In this paper, the recommended period shortening factor for the multi-storey reinforced concrete frame structure is gave 0.4~0.5.
Monorail Truss Structure Selection Based on Modal Analysis
Authors: Wang Jun Pu , Zhou Yong Ling , Wan Fu , Huang Tao , Liang Heng
Published: November 2012

The monorail truss structure natural vibration characteristics affect the performance of monorail in the work, this paper apply finite element method to carry out monorail truss natural vibration characteristics research. Considering the engineering practice, research and development two groups of monorail truss structure, calculated strength for two kinds of structural, two groups of truss structure strength meet the requirements, then used Guyan reduction theory to carry out modal analysis for the two trusses. From the modal analysis result can be found that the two groups of truss each order natural vibration period are not significant, structure natural frequency is intensive distribution, truss 2 dynamic rigidity is better, so was selected as the final structure scheme. The design ideas and methods provide a useful reference.
The Effects of the Jet-Flow on Sound Propagation in Low-Speed Wind Tunnel
Authors: Wang Yi Gang , Yang Jia Shun , Yang Yang , Yang Zhi Gang
Published: November 2012

Based on the open-jet aero-acoustic wind tunnel, an experimental study was made to research the effects of the jet-flow on sound propagation. This study is focused on the changes of the direction of the sound propagation, the changes of the sound pressure level, the phenomenon of tone broadening and the availability of the existing prediction method for sound propagation in jet-flow. The results indicate that the influence of the jet-flow on the value of the noise source shift varies along the direction of the jet-flow and there is no regular influence on the sound pressure level. In addition, the flow around the test sample has affected the sound propagation, and the phenomenon of tone broadening exists when high frequency signal is used. The study also reveals the limitation of the application of the existing prediction method, because the model it used is too simple.
Analysis on Vibrations due to High-Speed Railway Tunnel and Control Measures
Authors: Quan Xiao Juan , Shi Kai , Yan Yi Bo
Published: November 2012

With the economy developing rapidly, China has entered the era of high-speed railway, but at the same time, the negative impact of high-speed railway is increasing obviously. The paper analyzes the induced environmental vibration problems due to the high-speed railway, the specific response in the power of the shield tunnel under the train loads, the tunnel structure and the surrounding strata, When the local layer is saturated sand, by calculating the pore water pressure and the layer stress, determining whether it can cause sand liquefaction phenomenon or not, judging the damage extent of tunnel structure, especially it may influences the normal operation of the train. The vertical displacement of the tunnel structure due to the dynamic train load may have impact on the normal operation of the train, where some preventive measures should be taken, such as concrete grouting reinforcement method. In this paper the non-reinforcement case is compared to the reinforcing ones, and different reinforcement ring thickness is studied in order to determine a reasonable thickness of the reinforcement. The main contents include the following work: （1）Response analysis by using the FLAC3D software to simulate the shield tunnel under the dynamic train loads which are the main cause of the displacement of the segment and surrounding strata. The simulation study mainly includes analysis of the changes of pore water pressure and stress. （2） Since train load can produce the vertical displacement, prevention and controlling measures should be taken, which mainly use grouting reinforcement.
The Characteristic Analysis of Vibration for High-Speed Train-Ballastless Track-Bridge System Base on A Hybrid FE-SEA Method
Authors: Luo Wen Jun , Lei Xiao Yan , Lian Song Liang , Liu Lin Ya
Published: November 2012

A hybrid method combining FE and SEA was recently presented for predicting the steady-state response of vibro-acoustic systems. The new method is presented for the analysis of complex dynamic systems which is based on partitioning the system degrees of freedom into a ‘‘global’’ set and a ‘‘local’’ set. The global equations of motion are formulated and solved by using the finite element method (FEM).The local equations of motion are formulated and solved by using statistical energy analysis (SEA). The power input from the global degrees of freedom. This paper deduces the theory for the beam element , and Train-Ballastless Track-Bridge System provides an application, and it showed that the method yields very good results .
Analysis on Vibration Reduction Characteristics of Ladder Track Structure on Metro Viaduct under Measured Track Irregularities
Authors: Liu Xiao Zhou , Lian Song Liang , Wei Hong Liang
Published: November 2012

3D FEM models of ladder track and rail-bearing platform track on metro viaduct were established to analyze the vibration reduction characteristics of ladder track structure. Based on track irregularities measured by track inspection car, time-history vertical accelerations of rail, sleeper, flange and beam bottom were solved to contrast the dynamic characteristics of the two track structure. Results show that the vibration level of rail and sleeper are higher on ladder track than on rail-bearing platform track, and the vibration reducing effect of ladder track for flange and beam bottom mainly embodies in frequency range of 1~40Hz in which average vibration reduction values on flange and beam bottom are 28dB and 22dB, with maximum values 40dB and 33dB. The results can provide reference for design of ladder track as well as its application in metro line.
The Research of Cylindrical Noise Source Distribution Using Near-Field High-Resolution Location Methods Based on MVDR Algorithm
Authors: Chen Huan , Xu Feng , Su Shuai
Published: November 2012

According to the lack of cylinder-model noise source localization technology based on near-field focused beam-forming, the paper aimed to find a near-field high-resolution method of the cylindrical noise source which is applied to measure the model as cylinder-models. This method established a near-field measurement model of noise sources using cylindrical measurement surface, and applied MVDR algorithm to noise sources localization. Reconstruct the cylinder measurement surface through the joint amplitude-phase compensation to achieve the noise source high-resolution localization and relative intensity estimates in the near-field. Verify the availability of this method through the simulations, which provided a theoretical basis for the next practical engineering application of the cylinder-model noise source localization based on near-field focused beam-forming.
Hopf Bifurcation and Numerical Simulation in a Calcium Oscillation Model
Authors: Zuo Hong Kun , Ji Quan Bao , Zhou Yi
Published: November 2012

Calcium oscillations play a very important role in providing the intracellular signaling, and many mathematical models have been proposed to describe calcium oscillations. The Shen-Larter model presented here is based on calcium-induced calcium release (CICR) and the inositol trisphosphate cross-coupling (ICC). Nonlinear dynamics of this model is investigated by using the centre manifold theorem and bifurcation theory, including the variation in classification and stability of equilibria with different parameter values. The results show that the appearance and disappearance of calcium oscillations are due to subcritical Hopf bifurcation of equilibria. The numerical simulations are performed in order to illustrate the correctness of our theoretical analysis, including the bifurcation diagram of fixed points, the phase diagram of the system in two dimensional space and time series.
Analysis of Attitude and Dynamics Characteristic of a Kind of Submerged Buoy
Authors: Wang Jian Xun , Gui Hong Bin , Chen Xi , Fu Qiang
Published: November 2012

In this paper, the attitude and dynamical characteristics of a kind of submerged buoy are studied. The attitude of the buoy system is calculated relatively accurately by mathematical derivations and programming, in which all the tangent and normal fluid drag forces and elastic deformation of the mooring cable are considered. Based on the ANSYS FEA software, the model of system in fluid is established, which takes the effects of fluid drag forces, pretension and additional mass into account. Then the analysis of the effect on dynamics characteristic of the system by considering the attitude or not is carried out. The results indicate that, for small-scale submerged buoy system, the completed fluid forces should not be ignored, and the vibration of mooring system of submerged buoy is most likely to be low-frequency vibration, which should be avoided in some ways.
Dynamical Analysis of a Calcium Oscillation Model in Non-Excitable Cells
Authors: Zhou Yi , Wu Zheng Fei , Huo Yu Hong
Published: November 2012

The Borghans-Dupont model of calcium oscillations based on both the calcium-induced calcium release and calcium-activated inositol trisphosphate concentration degradation is considered. Dynamical effect of the stimulation level on the calcium oscillation behavior is studied. The qualitative theory of differential equations is used to explain the mechanism of these oscillations. We investigate the existence, types, stability and bifurcations of the equilibria by applying the centre manifold theorem, stability theory and bifurcation theory and prove that oscillations are due to supercritical Hopf bifurcation. Finally, we perform numerical simulations, including time courses, phase portraits and bifurcation diagram, to validate the correctness and the effectiveness of our theoretical analysis. These results may be instructive for understanding the role of the stimulation level played in complex dynamics in this model.
Nonlinear Dynamics of Simple-Supported Beam under Concentrated Moving Load
Authors: Cao Dong Xing , Chen Bao , Zhang Wei
Published: November 2012

The dynamic responses of two kinds of simple-supported beams with single layer and double-layer under a moving load were analyzed based on the theory of nonlinear dynamics. The equations of motion are derived by using Hamilton’s principle and von Karman type equations for the two models. Galerkin’s method was employed to obtain the ordinary differential equations of motion. First we obtain the periodic motion waveforms in the mid-point of the beams at the same initial velocity, and the result show that the amplitude of the double-layer model is much smaller then that of the single-layer model. Then for the two models, the vibration response and critical velocity were studied considering the effect of the structural parameters, the magnitude and velocity of moving load. The results of numerical simulation show that double-layer beam model has better vibration suppression performance than single-layer beam model.
A Study on Dynamic Performance of Deviation-Based Sliding-Door in Closed State
Authors: Chu Guo Ping , Liu Peng Fei
Published: November 2012

This paper presents a flexible deviation model of sliding-doors developed using influence coefficient method. By introducing the deviation factors such as seal strip reaction force and door’s dynamic deformation, the closed-loop relationship of size of the sliding-door system when it is in closed state is further established. Then based on the influencing relationship of the sliding-door deviation on the system flexibility and stiffness, the influence of the deviation on the door dynamic performance is obtained. Finally, through analyzing the frequency response of a real sliding-door, the optimal door deviation design is proposed and the effectiveness of the method is also verified.
Research on Fatigue Life Prediction of Gear Box in Caterpillar Based on Running Simulation Test
Authors: Dong Zhao Wei , Wu Jing , Du Xiu Ju
Published: November 2012

Gear box in caterpillar is designed with the static strength theory. While the dynamic characteristics of planetary parts in different working condition is difficult to obtain with the limit of traditional method, so research on reliability and fatigue life prediction of gear box is very difficulty which result that designed life is much longer than practical life. The reliability of caterpillar is affected deeply. The dynamic loads suffered by gear box in different working condition is obtained based on running simulation with MSC.ATV, and then the fatigue life of planetary frame is calculated with fatigue life prediction system of gear box. The study case prove the new method is feasible.
NN-PID Adaptive Control for 6_PUS Parallel Mechanism
Authors: Tan Xing Qiang , Li Guo Yun
Published: November 2012

6_PUS parallel mechanism is a new type manipulator which has two guide rails, along which six sliders connected with tie rods by hooke joints are driven by linear motor and then motion platform is driven by tie rods. In order to obtain precision loci of motion platform, linear motor should be controlled exactly. During the modeling of 6_PUS parallel mechanism, RBF NN is selected to approach the nonlinear of this manipulator, and neuron PID controller is used to regulate the controlled object. In this paper, regulating rules of the control system is introduced in detail, and the control efficiency is proved by experiments which show neuron adaptive PID controller can deal the nonlinear of 6_PUS parallel mechanism and get preferable control precision to ordinary PID controller.
Modeling and Simulation of Hydraulic Turnover Device for Large Bearing House
Authors: Zhu Xin Cai , Guo Lei , Ding You Qing , Lin Shun Hong
Published: November 2012

The geometric models of the hydraulic turnover device are constructed by using three -dimensional modeling software UG, and then they are induced into simulation software ADAMS by a sharing data format. By using ADAMS, models are further simplified and the virtual prototype is established. By using the associated model, the simulation of the hydraulic turnover device is analyzed in ADAMS. Compared with the traditional methods of using physical prototypes, the movement processes and relevant parameters of the hydraulic turnover device can be effectively obtained by means of this method. Furthermore, the quality of the constraint relations between the parts is very important in terms of the accuracy of the model simulation analysis. This simulation results accord with the practical situation, which indicates that the operation is stable and the efficiency is high. It provides a theoretical basis for the practical design of the hydraulic turnover device, which shows that the combination of ADAMS and UG works well.
Dynamic Performance Test and Analysis of Spindle System of High Speed Grinding Machine Tools
Authors: Guo Miao Xian , Li Bei Zhi , Yang Jian Guo
Published: November 2012

The high speed machine tool spindle plays an important role in machining operations. Based on modal test techniques and rotating machinery signature techniques, the research focused on the test and analysis of the dynamic characteristics of spindle system of high speed grinder. First, an experimental modal analysis (EMA) is performed in the spindle system; then, the frequency response characteristics and the FRFs of the system should be considered. Furthermore, rotating machinery signature techniques are used to analyze the dynamic behavior of the spindle system in process due to the limitation of modal test techniques, and the theoretical proof is given to explain the spindle system order. The results show that it requires the machine tool to avoid the use of vibration-sensitive speed in the production process and the machine production process, especially bearing manufacturing to improve its accuracy.
Study on System for Monitoring Mine Belt Conveyor Fire
Authors: Huang Min
Published: November 2012

According to the statistical data offered by US Bureau of Mines, belt conveyor fires account for about 20 percent of the mine fires Technologies on belt conveyor fire-monitoring system have drawn the attention from both scientific research institutions and manufacturing corporations. However, most methods and techniques available for monitoring the belt conveyor fire in mines are still not satisfactory. This paper presents a set of new methods and techniques for monitoring and forecasting the mine belt conveyor fire, and introduces a new practical system which is developed on the basis of them, including the design and installation of transducers, the design of conversion circuits, the design of monitoring and fault diagnosis software. Industrial applications as well as laboratory experiments have proved that this system is characterized by its simplicity in structure, convenience in installation, reliability in performance and strong environment adaptability, etc.
Effect of Service Speed on Dynamic Response of Heavy-Load Depressed Center Flat
Authors: Zhou Su Xia , Long Teng , Xie Yun Ye , Xie Ji Long
Published: November 2012

In order to study the dynamic response characteristics of depressed center flat car with different velocity, based on multi-body system dynamics software SIMPACK, 320t depressed center flat car system rigid body and rigid-flexible coupling-body dynamics model were established and the dynamic response simulation analysis of empty and loaded flat was carried out under several velocities. Then maximal vertical vibration displacement amplitudes and vertical vibration accelerations of depressed centre flat frame under different velocities were obtained. It showed that the maximum accelerations and displacements amplitudes increase with as the speed gradually increased for both empty and heavy vehicles and the trends are similar for the rigid body or rigid-flexible coupling-body. But the values of rigid-flexible coupling-body are bigger than that of rigid body because the elastic vibrations from the depressed center flat frame and all levels of suspension contribut to the vertical displacement. As the speed increases, the vertical displacements of the rigid-flexible coupling-body and the elastic ones response synchronously. The vertical displacements of the empty and heavy vehicles reach their peak values at different speeds and the elastic displacement also has a large proportion, which shows that there are larger elastic vibrations at the speeds. Therefore, it is not suitable for the depressed centre flat to run at very high speeds, and the speed should be confined.
Fatigue Strength Analysis of the Actuator for the Steering Gear Based on DFR
Authors: Duan Gang , Yuan Hong Jie
Published: November 2012

In order to assess whether the durability of the designed product meets the requirements or not, the fatigue strength should be analyzed in product designing stage. With the help of ANSYS finite element analysis software, the detail fatigue rating (DFR) method and the linear cumulative damage theory are used to analyze the actuator from three aspects of the static strength, stiffness and fatigue strength. A Stiffness Model of the Actuator has been built in the static strength analysis. The paper also highlighted the theoretical derivation of the DFR and the application in the fatigue strength calculation of the actuator. In practical projects, this method can be applied to similar products, and it can be used as a verification method for design optimization.
Study on the Effect of Dynamic Wheel-Rail Contact Geometry Relationship in Turnout Region by the Track-Distance Roughness
Authors: Xie Kai Ze , Wang Ping , Wang Li , Wang Biao , Quan Shun Xi
Published: November 2012

Because of the complexity of turnout, the wheel-rail contact of turnout region is more complex than that of railway line. In order to study the wheel-rail contact Geometry relationship of turnout region, using cubic spline interpolation method to get the outline of control sections, the ideal wheel-rail contact relationship in turnout region was obtained by the means of trace line, and then analyze the effect of track-distance roughness on the dynamic wheel-rail Geometry contact, the result shows that appropriate gauge widening can improve the structure irregularity.
Analysis of Influence Factors of Switching Force and Inadequate Displacement of Switch Rail of NO.9 Turnout
Authors: Wang Biao , Wang Ping , Xie Kai Ze , Wang Li , Quan Shun Xi
Published: November 2012

Switching force and inadequate displacement are two key issues in the conversion of switch rail, which determined some important parameters such as the traction position of switch machine, the displacement of traction point and the length of switch rail. This paper taking the NO.9 turnout of 60kg/m rail in a line of Wuhan rail transit as the research object, using the open architecture of ANSYS software and its secondary development, establishing the calculation procedure of switching force, calculating and studying the influence of switch force and inadequate displacement of switch rail by the stiffness, the number of fastener groups and the friction coefficient of sliding bed on the heel of switch rail.
Seismic Risk Assessment of Structures Using Multiple Stripe Analysis
Authors: Ni Peng Peng , Wang Shu Hong , Jiang Lei , Huang Run Qiu
Published: November 2012

The implementation of seismic risk assessment of existing structures is necessitated for practical engineers to select the retrofitting strategies. The reliability based approaches are proposed to investigate the behaviour of structures subjected to ground excitation and encouraging evaluation results of various typologies of structures have been obtained exploiting such methodologies. The decision regarding the retrofitting strategies that will rehabilitate the flaws of the structure under prescribed ground motions that have high probability of occurrences at the scenario can be made. This paper addresses the generation of hazard curve by probabilistic seismic hazard analysis from the seismological point of view. The multiple stripe analysis, as one of typical probabilistic based assessment procedures, will be utilized to evaluate the structural seismic fragility. The seismic risk can be estimated based on the numerically integrating the fragility function with the hazard curve.
Analysis of Influence of Material Damping on the Dynamic Response of Concrete-Filled Square Steel Tubular Columns
Authors: Wang Yuan Feng , Li Xiao Ran
Published: November 2012

The damping characteristic and dynamic responses of the concrete-filled square steel tubular (CFST) columns were numerically investigated in this paper. Finite element iteration method in the hysteretic damping system for CFST materials was presented, and an improved method considering viscous damping dynamic equilibrium equation with hysteretic damping model was also proposed. Based on the proposed methods, the loss factor and dynamic response of CFST columns subjected to the earthquake and harmonic loadings were effectively calculated. The results indicate that the stress-dependent damping method induces a larger dynamic response, and the loss factor of the CFST columns increases with the increase of the stress amplitude and lower steel ratio.
Vibration and Modal Analysis of Induction Motor
Authors: Li Rui , Jia Qi Fen , Zhong Shun
Published: November 2012

Calculation of the induction motor machine modal frequencies of an electrical machine accurately is the base of reducing acoustic noise and vibration. This paper presents a detailed research on the induction motor mode shapes and natural frequencies of induction motor by using 3D finite element technique, based on simplified modal, The influence of and mounting feet and rotor on mode shapes and natural frequencies are investigated systematically. Mounting feet and rotor have a great effect on natural frequencies, the mounting feet and rotor will result in the number of the motor low-vibration mode increases\the frequencies rise obviously, the mounting feet result in motor vibration mode becomes more complicated, rotor modals become an important part of motor mode shapes, the number of the motor low-vibration mode increases. Predictions are validated against experimental results.
Nonlinear Finite Element Analysis of the Temperature Field of Special-Shaped Concrete-Filled Steel Tubular Column under Standard Fire Condition
Authors: Wang Ya Wen , Li Yan Bo , Chen Zhi Hua , Wang Xiao Dun , Song Bo , Wang Guo Hui
Published: November 2012

The special-shaped concrete-filled steel tubular column (SCFST column) is recognized to have high bearing capacity and good fire resistance. This paper introduced a nonlinear FEA approach to analysis the temperature field of SCFST under standard ISO-834 fire condition. Finite element model was built with nonlinear material properties elements in ANSYS; thermal boundary conditions were applied to the model with convection and radiation combined to simulate the fire condition, and several conclusion were obtained from the nonlinear FEA results.
Material Strain Analysis of CFRP Reinforced RC Columns Subjected to Combined Action of Force by Finite Element Method
Authors: Liu Yan Zi , Liu Zheng , Li Jiong , Chen Xin
Published: November 2012

Using the finite element software ANSYS to analyze the CFRP strengthened concrete columns.The concrete columns are in the axial force existence situation, many columns should be reinforced by longitudinal and circumferential CFRP because of insufficient capacity. Subject to loading,11 root columns were designed, aiming to the layer number of CFRP, the location and orientation of CFRP, the eccentric distant of specimens.One of them is a non-reinforcement column.Under compression, bending, shearing and monotonic torsion, the nonlinear finite element model was established to test stressed steel bar in column test specimens, including longitudinal tensile reinforcement, longitudinal compression reinforcement and stirrup, as well as CFRP has been analyzed, including stress changing of longitudinal CFRP and transverse CFRP. The torque-strain curves for relationship were discussed among longitudinal reinforcement, stirrup and CFRP.
Researched on Maximum Power Point Tracking of PV Power System
Authors: Chen Wei Min , Chen Shuang , Xie Nan , Cai Hui
Published: November 2012

To the oscillation and misjudgment problem of the traditional perturbation and observation algorithm, a novel three-point comparison method was proposed. This method applied Constant Voltage Tracking (CVT) method and variable-step perturbation method to solve the problem between tracking accuracy and speed, and applied double-direction perturbation method to make sure the reliability of action to avoid the misjudgment when external conditions fast changing. Restraining the oscillation near the maximum power point effectively was another merit of this proposed method. Finally, the experimental results demonstrate effectiveness of proposed method with PV experimental platform.
Research of the Wind Power’s Transient Stability
Authors: Zhou Yuan , Wang Zhi Jie , Liu San Ming , Sun Xia
Published: November 2012

The purpose of this paper is to improve the transient stability of wind power system. This paper presents a new DFIG control strategy, The strategy achieve the decoupling of reactive power and active power. In order to improve the transient stability of wind power, here lead STATCOM into wind power system. Then put forward the STATCOM'S control strategy according it's mathematical model. The simulation result shows that, the proposed scheme can greatly improve the wind power system's transient stability.
Study on Power Converting System of Liquid Metal MHD Generator Driven by Wave Energy
Authors: Xu Yu Yu , Bai Jing , Peng Yan , Li Ran , Zhao Ling Zhi , Sha Ci Wen , Wei Wen De , Liu Bao Lin , Li Jian
Published: November 2012

This paper firstly describes magnetohydrodynamic (MHD) generator, which makes use of liquid metal and provide an excellent match to the mechanical impedance of an ocean wave. Then a new power converting system especially for LMMHD generator is designed and simulated, the results show that the power converting system can meet the requirement of LMMHD generator and has the advantage of lower cost.
Research on OPPC Application in Low Voltage Circuit of Liaoning Power Grid
Authors: Meng Fan Bo , Zhao Hong Hao , Wang Jie
Published: November 2012

As a new kind of optical cable with high energy efficiency, low cost and high reliability, optical phase conductor (OPPC) cable has received widely concern in the industry area. In this paper, we consider the practical experience from the projects and take 10kV and 66kV circuit as examples. We analyze and discuss the important and difficult issues and problems of OPPC cable in design, construction and operation based on the requirement and circumstance of low voltage power grid communication network. After that, we provide a feasible and effective solution for low voltage grid of fiber optic coverage.
Experimental and Numerical Study of the Energy Absorbed with Various Thickness of Thin Rectangular and Square Sections
Authors: Dehghanpour Sajjad , Dehghanpour Sobhan
Published: November 2012

Impact is one of very important subjects which always have been considered in mechanical science. Nature of impact is such that which makes its control a hard task. Therefore it is required to present the transfer of impact to other vulnerable part of a structure, when it is necessary, one of the best method of absorbing energy of impact , is by using Thin-walled tubes these tubes collapses under impact and with absorption of energy, it prevents the damage to other parts. Purpose of recent study is to survey the deformation and energy absorption of tubes with different type of cross section (rectangular or square) and with similar volumes, height, mean cross section, and material under loading. Lateral loading of tubes are quasi-static type and beside as numerical analysis, also experimental experiences has been performed to evaluate the accuracy of the results. Results from the surveys is indicates that in a same conditions which mentioned above, samples with square cross section ,absorb more energy compare to rectangular cross section, and also by increscent in thickness, energy absorption would be more.
A Novel Hardware Implementation for Specular Intensity of Phong Shading Used in Embedded Graphic Applications
Authors: Li Bing Chao , Wei Ji Zeng , Chang Yi Song , Guo Wei , Sun Ji Zhou
Published: November 2012

In this paper we propose a novel hardware implementation applied in embedded system for the power computation of specular term of Phong shading. Based on piecewise linear approximation, the power unit is implemented with SMIC 0.18μm CMOS technology and can complete 50 million power computation per second with the maximum approximation error of 0.00141 when the exponent of power is 20. The area cost is 12.3K gates. The maximum RGB color error of generated graphics is only 1 resulting in no visual difference compared with graphics generated by software.
Research on Fault Detection Method of Converters
Authors: Ma Wen Zhong , Chen Ke Cheng , Shan Yang , Wang Yan Li
Published: November 2012

The influence of converter faults to the system is introduced and the fault detection method based on wavelet transform and neural network is proposed in this paper. The fault information can be decomposed by wavelet transform, then the fault eigenvectors can be extracted and put into neural network for training and testing. Finally the neural network outputs specific codes, and thus the fault location and fault components of converters are confirmed, which lays the foundation for the fault-tolerant operation control of converters. Simulation and experimental results show the correctness and effectiveness of the method.
Online Fatigue Monitoring System for Steam Turbine Rotor in Power Plants Considering Sub-Synchronous Oscillation
Authors: Liu Shi , Li Bin , Zhang Heng Liang , Wang Cong , Shi Yang , Xie Dan Mei
Published: November 2012

This paper presents a system developed for online fatigue monitoring for steam turbine rotor in power plants. The system converts the plant transients to temperature and thermal stress responses using the analytical models modified by FEM. The torsional vibration caused by the possible sub-synchronous oscillation (SSO) phenomenon in power networks has been analyzed. The fatigue damage caused by thermal stress and SSO is studied based on the stress analysis and fatigue cumulation. The fatigue usage factor is computed using the rainﬂow cycle counting algorithm. The method can provide useful information in support of the unit’s life cycle management and efficient.
A New Moving Human Detection Method in Color Video Image
Authors: Wu Tia Nai , Wu Yun Rong , Wu Yun Yu
Published: November 2012

Moving object detection is the basic of video applications such as computer vision, object recognition and tracking, surveillance security etc. Background subtraction and symmetrical differencing are the popular methods of motion detection. The main idea of them is to compare the current video frame with a specified background image or a background model or the next video frame. For background subtraction, the obtaining of initialization is crucial and many methods have been employed, so it is necessary to model background to adapt the changes of background. In this paper, the single gaussian modeling as the initialization background model combined with an improved linear alternate background updating method is proposed. And then, a novel moving human detection method which employs background subtraction and symmetrical differencing based on rgb color difference model is presented. The experimental results show that the detection method can detect moving human effectively and real-time.
Detection for Heading and Attitude Signal Conversion Equipment of Aircraft Based on Virtual Instrument Technology
Authors: Lv Xue Yan , Li Yong Ze , Chang Li Min
Published: November 2012

The scheme adopts computer testing technology, virtual instrument and virtual system technology to realize the automatic detection for heading and attitude signal conversion equipment of aircraft. It greatly improves the test efficiency. Test time was reduced from 30 minutes to 3 minutes. Based on wavelet analysis and hierarchical decision, program module of connected line identification is design and it improves the reliability of program running. Noisy signals are de-noised by automatic zoom function of wavelet transform and that solves the interference problems of AC power supply.
Leakage Line Detection Based on Improved Grey Absolute Relation Degree Model
Authors: Zhao Jian Wen
Published: November 2012

For the defects of traditional grey absolute relation degree, the improved grey absolute relation degree model is presented. Compared with the traditional one, this improved model is more excellent in characteristic, and which takes on consistency and isotonicity; and then the veracity and reliability of grey relation analysis are enhanced. Using this new model to discriminate waveform change rate of zero sequence currents in fault transient course, the leakage line detection method is established. The simulation and lab test indicate that this method can rapidly detect leakage line self adapting in transverse direction, algorithm is simply, and not influenced by random factors.
Route Identification in Intelligent Traffic System Based on CMOS Image Sensor
Authors: Wang Tong , Tian Geng , Han Cong
Published: November 2012

This paper introduces a method based on image processing technology, which allows model car to identify the route on a white board. Our system uses MC9S12XS128 as the control unit, CMOS camera is applied to capture data, and H-bridge driver circuit supports the motor. In addition, we use the ultrasonic to calculate the distance and wireless data transmission module to protect the car from a crash. Finally, we establish an algorithm which controls the car and recognize dotted lines in order to overtake the other model car at speed-change area.
Research and Optimization on the Venturi Tube Dynamic Throttling Element of New Flowmeter
Authors: Ding Jian Mei , Zhang Xiang Bing , Kou Lu Ding
Published: November 2012

According to the working process of dynamic throttling element flowmeter, the Reynolds number keeps constant when the flow is steady. The way to change the pressure drop is to change the local pressure loss. Based on the Fluent software, analyze how the structure parameters of venturi tube affect pressure drop. With the completion of flowmeter prototype, test the dynamic throttling element by using a kind of binary flow calibration platform. According to the test result, figure out that the optimization can perfectly meet the real flowing condition.
Speech Endpoint Detection Based on EMD and Spectral Entropy in Noisy Environments
Authors: Liu Yan Li , Zhang De Xiang , Ji Ming Wei
Published: November 2012

Accurate endpoint detection is crucial for speech recognition accuracy. A novel approach that finds robust features for endpoint detection based on the empirical mode decomposition (EMD) algorithm and spectral entropy in a noisy environment is proposed. With the EMD, the noise signals can be decomposed into different numbers of sub-signals called intrinsic mode functions (IMFs), which is a zero-mean AM-FM component. Then spectral entropy can be used to extract the desired feature for IMF components. In order to show the effectiveness of the proposed method, we present examples showing that the new measure is more effective than traditional measures. The experiments show that the proposed algorithm can suppress different noise types with different SNR, and the algorithm is robust in the real signal tests.
MVC Design Patterns in the Airport Power Supply Monitoring Equipment Troubleshooting of the Application of the System
Authors: Wei Xiao Bin , Zhu Yi , Zhao Xu Seng , Zhang Wei
Published: November 2012

This paper introduces the structure of aerodrome power supply equipment trouble- shooting system. It expatiates on the software design of MVC pattern in detail. And it realizes the software design idea of hign coheres and low coupling. It also improve software maintainability and expansion.
Intelligent Card Heat Meter System Design Based on Singlechip PIC16C72
Authors: Liu Ji Ping
Published: November 2012

This paper mainly introduce the hardware design and working principle of intelligent IC card heat meter which use the single-chip PIC16C72 as the core. This heat meter system can calculate the actual heat consumption in certain time that is used by users through measuring instantaneous flow and temperature of hot water, and users can adjust water flow of heating apparatus to realize the targets of saving both energy and charges.
Research on FFT and FBG Mechanical Vibration Monitoring System
Authors: Zhao Lin , Wang Chang , Min Li , Li Shu Juan
Published: November 2012

The vibration sensor signal acquisition and FFT signal processing principle are described in detail, designed a fiber Bragg grating vibration monitoring system. On one hand, the system realized the multi-parameter data acquisition and remote transmission of fiber Bragg grating technology, on the other hand, provide complete data analysis and display functions. The experimental results show the system can be used effectively for turbine engine vibration monitoring, provides software support for subsequent fault diagnosis.