bluuebunny/crossref_metadata_2025 huggingface dataset:
Control of Unstable Flow Using Rough Surfaces
Authors: Ahmed Saad
Published: October 2013

The function of centrifugal blowers/compressors is limited at low-mass flow rates by fluid flow instabilities leading to rotating stall. These instabilities limit the flow range in which they can operate. An experimental investigation was conducted to investigate a model of radial vaneless diffuser at stall as well as stall-free operating conditions. The speed of the blower was kept constant at 2000 RPM, while the mass flow rate was reduced gradually to investigate the steady and unsteady flow characteristics of the diffuser. These measurements were reported for diffuser diameter ratios, Do / Di, of 1.5, 1.75 and 2.0 with diffuser width ratio, b / Di, of 0.055. The rotating stall pattern with one stall cell was dominant over the pattern with two cells which appeared at flow rates lower than the critical. In addition, the instability in the diffuser was delayed to a lower flow coefficient when rough surfaces were attached to one or both walls of the diffuser with the lowest values achieved by attaching the rough surface to the shroud wall. Results show that the roughness has no significant effect on stall cell frequencies.
Evaluation of Stress Intensity Factor of 316 SS LN Circular Grid Plate Hardfaced with Colmonoy 5 for Various Loads
Authors: Balaguru S. , Saranraj K. , Murali Vela  , Chellapandi P.
Published: October 2013

In sodium cooled fast breeder reactors, the high operating temperature necessitates hardfacing of grid plate to avoid galling of the base material. Nickel based cobalt-free alloy called Colmonoy-5 has been chosen as the hard facing material for the Prototype Fast Breeder Reactor (PFBR) grid plate. The grid plate (GP) which is a critical component made of SS316 that holds the core subassemblies are hard faced, to prevent galling caused by subassembly insertion/removal and erosion due to high sodium velocity at 670 K. Colmonoy 5 was hardfaced on circular grid plate along the annular groove by Plasma Transferred Arc Welding (PTAW). The process-induced residual stress generated due to difference in coefficients of thermal expansion between the deposit and substrate material was removed by annealing. In this paper, in order to evaluate Stress Intensity Factor (SIF) near the crack tip of the crack caused by the remote load or residual stresses generated due to thermal cycling owing to on/off of nuclear reactor, a grid plate model hard-faced with colmonoy 5 was prepared and then annealed to remove process-induced residual stress. Considering the plane strain condition to the same geometry of the model, a 3mm crack was considered at the vertical interface between the steel and the colmonoy. By supporting the specimen on the left and right corners of the upper side, load was applied exactly on the opposite side of crack in the positive direction, simulating mode I loading. After loading the model and getting the solution, KIwas obtained at the crack tip. This step was repeated for various loads to obtain the relationship between SIF and load for fracture characteristics.
Responses of Concrete Truss Spar Platform in Deep Wave
Authors: Shu Qing Lian , Yang Lu Ling , Gao Rui , Yang Ling Qiang
Published: October 2013

Concrete truss spar model was tested using regular waves in a wave basin andthe responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the modelparameters. The results are agreed well with thecorresponding results obtained from the test measurements. Then thisprogram was applied to a prototype sparsimulated results were compared with the corresponding numericalresults and test measurements.
Conductive and Radiative Heat Transfer in Foam Materials at High Temperatures
Authors: Li J.E. , Wang B.
Published: October 2013

At high temperatures, heat transfer in foams occurs by conductions through solid matrix and air as well as by thermal radiation propagating the structure. Starting from the analysis of different foam morphological structures, the body-centered cubic cell model is applied to predict the conductive and radiative properties. Both the open foams and the closed foams are analyzed. Temperature-dependency of the material properties is also taken into consideration. The Rosseland approximation is used to predict the radiativie conductivity. Effects of temperature, cell diameter and porosity on the equivalent thermal conductivity are discussed. It is found that both the temperature and the structure parameters have strong influences on the equivalent thermal conductivity.
The Approximate Analytical Solution of the MHD Flow of a Power-Law Fluid
Authors: Zhu Jing , Zheng Lian Cun
Published: October 2013

This paper presents a theoretical analysis for the incompressible MHD stagnation-point flows of a Non-Newtonian Fluid over stretching sheets.The governing system of partial differential equations is first transformed into a system of dimensionless ordinary differential equations. By using the homotopy analysis method, a convergent series solution is obtained. The reliability and efficiency of series solutions are illustrated by good agreement with numerical results in the literature.Besides, the effects of the power-law indexthe magnetic field parameter and velocity ratio parameter on the flow are investigated.
Experimental Study on Residual Stress in Titanium Alloy Laser Additive Manufacturing
Authors: Lai You Bin , Liu Wei Jun , Zhao Ji Bin , Zhao Yu Hui , Wang Fu Yu , Han Wen Chao
Published: October 2013

The residual stress in laser additive manufacturing titanium alloy sample was measured using indentation stress measurement method. The residual stress variation formulas was fitted with the major process parameters such as laser power, scanning speed, the powder feed rate etc.. It was studied that the influence of processing layers and scanning corner on the specimen residual stress. The results show that the specimen residual stress increases first and then decreases with the increase of processing layers, and the maximum appears in the fiftieth layer, in addition, the residual stress in the side of corner sample is mainly pressure stress, the maximum appearing in the 150°scanning angle, the minimum appearing in the 120°scanning angle. Therefore, it can reduce the overall sample residual stress effectively by an obtuse angle scanning trajectory.
FPGA-Based Expert PID Controller for Buck DC-DC Converter
Authors: Chen Yao , Chang Chang Yuan , Yan Yan
Published: October 2013

In this paper, an expert PID controller used for digitally controlled DC-DC buck converters is proposed. It is designed bycombing expert theory with traditional PID theory, basing on the controlled objects and the knowledge of control laws. The controller uses the expert experiences to regulate the PID parameters online according to the dynamic characteristics of the system. The simulation and practical results indicated that, comparing with conventional PID controller, the expert PID controller which has faster startup transient response, smaller overshoot and more stable steady-state response, is better than conventional PID controller. It is well fit for the demand of control system.
Design and Modeling of Anisolationstep-Down Transformer by Piezoelectric Material
Authors: Liu Chen Yao , Liu Kuo Bin
Published: October 2013

The energy conversion and the step-down voltage waveform of apiezo transformer are required to achieve an optimal working condition of the resonant frequency. To fulfill this requirement, a reliable and precise instrument is needed to scan the resonant point of the piezo transformer such that its output power performance can conform to the required specification. This paper describes the design and modeling of a new step-down piezo transformer deployed in NSRRC. This transformer is capable of delivering energy conversion with a highly efficient performance, better than that of a traditional transformer, and the voltage transfer ratio is correct. Use ofa simulation circuit model to develop its driver circuit is included in the design of this new step-down transformer. It has been tested and proved to work satisfactorily in power conversion with excellent efficiency and reliability.
Design and Implementation of Wireless Ad Hoc Smart Metering System for Power Quality
Authors: Zhong Yi , Li Yuan Ming , Cao Yun , Wu Wen Hua , Chen Cheng , Xu Wen Jun
Published: October 2013

In order to facilitate the advanced measurement system with real-time interaction in smart grid and to satisfy the requirements for power quality management, a wireless ad hoc smart metering system for power quality using Internet of things (IoTs) technology is presented in the paper. By utilizing the energy metering module to collect energy information, the ZigBee ad hoc networks to transmit energy information, and the user monitoring terminal to support power grids management, the proposed system is able to efficiently realize the power quality information collection, transmission, processing and sharing. Experimental results demonstrate that the system performs real-time and precious monitoring of the distributed client power quality information, together with friendly and intelligent interaction capability.
Optical and Luminescence Characteristic of Dy3+ Doped ZnO-Bao-TeO2 Glass System
Authors: Boonin K. , Yasaka Patarawagee , Kaewkhao J.
Published: October 2013

Properties of Dy3+doped ZnO-BaO-TeO2(ZBaT) glass systems with composition 15ZnO-5BaO-(80-x)TeO2-xDy2O3was measured for the composition range 1x8 (in mol%). The glasses were prepared by normal melt quenching technique and characterized their physical, optical and photoluminescence properties. The optical absorption spectra show peaks at4I15/2(466 nm),4F9/2(475 nm),6F3/2(756 nm),6F5/2(804 nm),6F7/2+6H5/2(904 nm),6F9/2+6H7/2(1096 nm),6F11/2+6H9/2(1280 nm) and6H11/2(1640 nm), reflecting the Dy3+in glass matrices. From the excitation spectra, five obvious excitation peaks were observed as follows: The ground state6H15/2to the excited states4M7/2+6P7/2(351nm),4I11/2(366 nm),4I13/2+4F7/2(385 nm),4G11/2(426 nm) and4I15/2(450 nm) of Dy3+. The emission band at 484, 575 and 661 nm arising from the transition4F9/26H15/2,4F9/26H13/2and4F9/26H11/2respectively were observed when the sample was excited by xenon flash lamp at 450 nm. The ZBaT glass doped with 1 mol% of Dy3+gives the highest result for luminescence properties.
Fabrication of a Carbon Nanotube Gas Sensor Microelectrodes and its Application for Ammonia Detection
Authors: Ran Xiang Tao , Wang Zhi , Yang Li
Published: October 2013

With the increasing needs for high-performance gas sensors in industrial production, environmental monitoring and so on, the research on gas sensors is becoming more and more important. In this paper, the electric field intensity distribution simulation process of the interdigital microelectrodes (IMEs) is discussed in details to get the proper electrode structural parameters. The IMEs on the ITO surface with a minimum gap of about 4μm are achieved by lithography, which provides a reliable, low-cost manufacturing method. Sensitive components are made of the multi-walled carbon nanotubes modified materials. The gas-sensing property of the sensor is detected for ammonia. The experiment result shows that the performance of the nanomodified sensor is obviously improved.
Analysis and Implementation of an Application-Layer Networking System on Wireless Sensor Network
Authors: Song Chau Chung , Feng Chen Fu , Lin Chieh Yao , Yan Bo Hao
Published: October 2013

In this paper, an application-layer networking system is analyzed and implemented for wireless sensor network. We focus on studying the binding connection methods on the applicationlayer network to implement the universal plug in/out capability on ZigBee networks. The proposed application-layer network provides a cluster-based and plug-and-play communication functions to dynamically and automatically connect in/out the ZigBee nodes on wireless sensor networks. Moreover, the network planning and connection mechanism is achieved by the Binding link objects of ZigBee application-layer functions. By means of Binding connection method, ZigBee nodes in sensor network can obtain the real-time messages and valid information each other. In this study, the various parameters setting and system firmware program are designed to analyze and evaluate the binding methods and data packets of application-layer communication for ZigBee network. Finally, the profile cluster IDs of application-layer network are applied to build up the specific ZigBee sensor systems with Cluster In/Out functions.
A Method for the Calculation of Dynamic Response Considering Joint Dry Friction
Authors: Wang Rong Qiao , Si Wu Lin , Hu Dian Yin
Published: October 2013

A method for computing dynamic response considering joint dry friction has been developed based on equivalent linearization and micro-slip model. Computational simulation model was established by linking corresponding contact nodes with Matrix27 elements which simulate additional stiffness and damping effects on structure caused by dry friction nonlinear force. Equivalent stiffness and damping coefficient formula was deduced to calculate real constants of Matrix27 elements. An iterative program was created to compute maximum slip displacements of Coulomb contact nodes on interface and dynamic response and vibration stress were calculated then. An experimental verification has also been carried out which testified the accuracy of the method. Evidently attenuation of vibration is revealed which certifies the effectiveness of joint dry friction damper. Better attenuation effect occurs when exciting frequency is nearer natural frequency.
Prediction of Muffler Transmission Loss and Shell Noise by a Coupled Structure-Acoustic Model
Authors: Huang Yao , Du Ai Min
Published: October 2013

Based on the vibration-acoustic analysis software VA One, a fully coupled structural-acoustic muffler FE model and a muffler cavity FE model are built. Then, a comparison is drawn between transmission loss of the coupled FE model and the cavity FE model, which demonstrates that the structure vibration has a big influence on the prediction of acoustic performance of muffler. Besides, radiated noise by muffler is calculated in this paper, which can provide a reference for the designanalysis and improvement of a muffler.
Simulation and Analysis on the Temperature Distribution of the Heating Channel in a Washer-Dryer
Authors: You Qi Xia , Lu Fei , Chen Yun Fei , Zhang Jian Run
Published: October 2013

In order to study the characteristics of the temperature field of the heating system in a washer-dryer, a numerical model to compute airflow field and temperature field is established according to the theory of fluid-solid coupled heat transfer. Simulation is realized based on the finite element method and verified with tests. The simulation results are in good consistency with the test result on the three aspects of temperature distributions, ranges and fluctuation tendencies. The errors of the lowest, highest and average temperature are all within 5.38%. Influencing factors leading to the offset of the high-temperature region in the downstream heating channel can be found from the valid simulation and they can provide theoretical basis for further optimization. The simulation results show that the configuration of the part of channel between the volute tongue and the heater leads to the transverse offset, and the triangular hump leads to the longitudinal offset.
The Mechanism Analysis of O Radical Effect on Ignition of Methane/Air Mixture
Authors: Li Yong , Shen Huai Rong
Published: October 2013

In order to show the physical mechanism of O radical on ignition of methane/air mixture, based on GRI-Mech3.0, the ignition were carried on by solving the mode of the closed reactors. It was found that the influence law on O radical effect on ignition of methane/air mixture. The numerical results indicate that the ignition time reduced about 94.7% by adding radicals of the 0.5% O. By using reaction path analysis and sensitivity analysis, the results have disciplinarian on the detailed kinetic enhancements of radicals on O radical on ignition of methane/air.
Comparison between Cell-Centered Schemes Computer Code and Fluent Software for a Transonic Flow Pass through an Array of Turbine Stator Blades
Authors: Alakashi Abobaker Mohammed , Basuno Bambang
Published: October 2013

The Finite Volume Method (FVM) is a discretization method which is well suited for the numerical simulation of various types (elliptic, parabolic or hyperbolic, for instance) of conservation laws; it has been extensively used in several engineering fields. The Finite volume method uses a volume integral formulation of the problem with a finite partitioning set of volumes to discretize the equations [. the developed computer code based Cell-centered scheme and Fluent software had been used to investigate the inviscid Transonic Flow Pass Through an array of Turbine Stator Blades. The governing equation of fluid motion of the flow problem in hand is assumed governed by the compressible Euler Equation. Basically this equation behave as a mixed type of partial differential equation elliptic and hyperbolic type of partial differential equation. If the local Mach number is less than one, the governing equation will behave as elliptic type of differential equation while if the Mach number is greater than one it will behave as hyperbolic type of differential equation. To eliminate the presence a mixed type behavior, the governing equation of fluid motion are treated as the governing equation of unsteady flow although the problem in hand is steady flow problems. Presenting the Euler equation in their unsteady form makes the equation becomes hyperbolic with respect to time. There are various Finite Volume Methods can used for solving hyperbolic type of equation, such as Cell-centered scheme [, Roe Upwind Scheme [ and TVD Scheme [. The present work use a cell centered scheme applied to the case of flow pass through an array of turbine stator blades. The comparison carried out with the result provided by Fluent Software for three different value of back pressure. The developed computer code shows the result close to the Fluent software although the Fluent software use a Time Averaged Navier stokes equation as its governing equation of fluid motion.
Design of a Foldable Flapping Mechanism
Authors: Fan Xiao Zhou , Zhang Zhi Lin , Chen Liang
Published: October 2013

Folding motion is important for a flight creature using flapping wing mode, but it seldom used for flapping-wing robot. In this paper, we propose a new foldable flapping wing mechanism, which consists of spatial crank-rocker mechanism, parallelogram mechanism, and cam mechanism. We establish the kinematical models, calculate the optimal parameters, and set up the virtual prototype using 3D software. The tracks of wingtip and the comparison between foldable and unfoldable flap wing show that folding motion can improve lift force obviously.
Fault Feature Extraction for Shaft System of Hydraulic Machinery Based on Wavelet Packet
Authors: Zhou Ye , Pan Luo Ping , Li Ping Ping
Published: October 2013

Shaft fault is the most common fault for hydraulic machinery. In this paper, wavelet packet energy spectrum analysis method was used for multi frequency bands division of shaft monitoring signals. The variable bands frequency energy can construct feature vectors needed for fault diagnosis based on support vector machine, by integrating the procedure of wavelet packet analysis method and online monitoring technology, feature can be extracted in real time, and it make possible for real-time fault diagnosis and prediction of hydraulic machine.
Study on the Application of High Precision Strain Acquisition System Based on Twin-Constant-Current Source
Authors: Hu Zong Ju , Long Zeng Yong
Published: October 2013

Aiming at the shortcomings of the constant voltage source strain acquisition system, the paper put forward a new strain acquisition technology based on the double-side half-bridge measurement of the constant current source. It has demonstrated and analyzed the advantages of constant current source circuit using for strain collection, and has raised the design of multi-channel strain acquisition system. Lab test and running in a large fan blade deformation tests showed that the strain acquisition system had high measurement precision, stability, anti-interference and reliability.
The PLC System Design of Mobile Floating Cleaning Machine
Authors: Lu Chun Hui
Published: October 2013

The floating can do harm to the reservoir facilities and makes the water dirty. Thats a serious problem in many rivers now. Mobile floating cleaning machine is more suits to large reservoir circumstance with high efficiency. The machine uses rake to grid block with dirt and floating in the water. It can clean the floating flexible by moving from one side to one other along two parallels tracks. Compare to computer, PLC is smaller, lighter and cheaper, while the program of PLC is easy to write. Because most Chinese cleaning machines are manual control with low efficiency, this design will save time and solve the low speed in cleaning. The PLC control made manual control and auto control circuit together while one type is easy to change to the other. The PLC program was successfully passed check in lab and explained by part of the trapezoid diagram procedure.
Parametric Design of Suspension Rig Based on VB and ANSYS
Authors: Zheng Xi Jian , Ma Jin Xia , An Yi Wei , Chang Xiao Hua
Published: October 2013

With self-developed designs the large load temporarily installed suspended access equipment (gondola) ZLP3000 as the prototype, based on the interface file formed by APDL and VB, the suspension rig parametric design program which regarded parameterized virtual design and finite element analysis as the core was designed. Parametric modeling of the overall structure, the optimization of the analysis and the result output were achieved. Multiple sets of schemes results data were extracted in the VB output interface, the optimal scheme of suspension rig structure layout was obtained based on comparative analysis of those data.
Flow Field Simulation of the Nozzle and the Influence of Size
Authors: Liu Shi Nian , Su Wei , Wei Zeng Fu
Published: October 2013

The nozzle is one of the critical parts in the dry-ice blasting system, spray nozzle's structure and the air supersonic free jet flow field take big influence on cleaning efficiency during the blasting process. Inner flow field of different size nozzles and the flow field of jet flow sprayed by nozzles were simulated with software Fluent, which obtained the distribution results of pressure and velocity of fluid. The result indicated that the supersonic underexpanded jet take place in the nozzle outlet and the shock wave is gained as the pressure at the nozzle exit is greater than the atmospheric pressure. With increasing of the nozzle size, the velocity decrease of airflow become slower, the shock wave transmission distance increase and deduce the stability of the jet flow.
The Backing Design in the Free Damping Cylindrical Shell Damping Test
Authors: Yin Bang Hui , Wang Min Qing
Published: October 2013

The ANSYS harmonic response results are post-processed with the energy method to obtain the damping loss factor (DLF) of different types of free damping structures. Firstly, the DLF of free damping cylindrical shell in air is compared with DLF of free damping plate in air. Secondly, the DLF of free damping cylindrical shell with stiffened ribs in air is compared with that without stiffened ribs in air. Thirdly, the DLF of free damping cylindrical shell in water is compared with the DLF of free damping plate in water. Fourthly, the DLF of free damping cylindrical shell with stiffened ribs in water is compared with that without stiffened ribs in water. In the end, based on the above analysis, the backing design problem in air and water are discussed. Studies have shown that: DLF of free damping cylindrical shell is close to that of free damping plate in air; DLF of free damping cylindrical shell with stiffened ring ribs is close to that without stiffened ring ribs in air; When testing free damping cylindrical shells DLF in air, plate with the same thickness can be used as the backing; DLF of free damping plate is close to that of free damping cylindrical shell in water; DLF of free damping cylindrical shell with stiffened ring ribs is close to that without stiffened ring ribs in water; When testing free damping cylindrical shells DLF in water, plate with the same thickness can be used as the backing.
Development of Power Semiconductor Devices DC Parameters Test Instrument
Authors: Liu Chong , Cao Yu Feng , Li Qi
Published: October 2013

Power semiconductor devices are widely used and its DC parameters test equipment are in great demand. This paper broke through the key technology of high pulsed current generating based on charging and discharging with the capacitor. High voltage source, big pulse current source, constant voltage source that can test large current constant, small current source, small voltage source, a digital voltmeter, etc important parts of a power semiconductor devices DC parameters test equipment have been developed. Also the measurement software for DC parameters testing of the power semiconductor devices has been developed. Based on above, power semiconductor equipments DC parameters test instrument have developed successfully.
Research on Parameter Identification of Electromagnetic Actuator for Diesel Speed Governing
Authors: Shi Yong , Jiang Tong , Yang Zai Ming
Published: October 2013

To identify parameters of electromagnetic actuators with analytical models, there are problems such as poor model accuracy, multiple physical fields coupling of model, and slow convergence. Based on error sensitivity numerical analysis, a parameter semi-analytical identification method for electromagnetic actuators is proposed. In this article, a diesel engine speed governing electromagnetic actuator is taken as the research object. First, with finite element method, a numerical simulation model of the electromagnetic actuator is established, and sensitivity of main geometrical parameters relative to electromagnetic force is analyzed. Secondly, with theoretical deduction, a difference model of the nominal and measurement electromagnetic force is built, and the electromagnetic actuators geometrical parameter identification formula is gotten. Thirdly, different numerical methods to construct a system error sensitivity matrix are compared, and the compared result is the accuracy of central difference better. Finally, the average static characteristics error of the electromagnetic actuator is reduced from 3.3174 to 1.0182. Therefore, the identification method is verified effective and feasible.
Research on the Manipulator for Packing Apple Based on its Material Function
Authors: Yu Jing Hu , Wang Jia Sen , Lu Hui , Ma De Jun , Li Xiao Feng
Published: October 2013

In order to package the apples automatically, a special kind of flexible manipulator was designed. The manipulator was composed of three fingers, and each finger consists two series joints with a single degree of freedom, torsion spring was installed on the joints. The two-joint finger is stretched by a cable-driven, which is connected to piston rod of cylinder, grasping apple force come from two torsion springs. The desination of manipulator based on the mechanical properties of apple. Based on the material funciton of special kind of apple, the spring parameters was optimized. The designed manipulator will have a good supple adaptation to different size apples without causing damage to apple.
Study on Temperature Characteristics of the Photovoltaic Panels of the Laser-UAVs
Authors: Cui Xiao Yang , Hong Yan Ji , Jin Xing
Published: October 2013

The concept of a UAV (unmanned aerial vehicle) with photovoltaic cells powered by a laser beam has been demonstrated as more firm, having higher usable power and more payloads than solar-powered ones, and features wide prospective. The theory models were based on the thermal equilibrium formulation which took into account of convective cooling raised by the flowing air and the radiation heat exchanges between the photovoltaic panel and the earth, and the atmosphere. Then, numerically, this paper investigated and analyzed the equilibrium temperature, energy efficiency, usable laser power density and maximum endurable laser power density of the photovoltaic panel, which can provide references for the choice of cooling methods and laser-power mission programming of the laser-powered UAVs.
Comparison of Control Allocation Algorithms Used in Stability Control of Four In-Wheel-Motors Drive Electric Vehicle
Authors: Yang Peng Fei , Xiong Lu , Yu Zhuo Ping
Published: October 2013

Design the stability control strategy of four in-wheel-motors drive electric vehicle (EV) based on control allocation. Two kinds of control allocation methods are designed in this paper, one is the quadratic programming (QP), and the other is a simplified optimization method (SOM). Comparing and evaluating the control strategies through the co-simulation with MATLAB software and CARSIM software. The results of the simulation show: both strategies could stabilize the vehicle posture well under critical condition. QP has more accuracy than SOM, and could rebuild the system automatically when the motor fails. But the SOM doesn’t need iteration, could be possible to use in the real vehicle.
Improved Adjoint Operator Method and Normal Form of Nonlinear Dynamical System
Authors: Li Jun Jun , Liu Xiao Qing , Yang Shi Zhu
Published: October 2013

An improved adjoint operator based on the adjoint operator concept of linear operator and S-N decomposition is proposed to calculate the normal forms of k order general nonlinear dynamic systems.Firstly, the whole polynomial solution space of homogeneous nilpotent partial differential equation are obtained.Secondly, the polynomial solution mentioned above is introduced into homogeneous semi-simple partial differential equation to find the whole polynomial solution space of a homogeneous linear partial differential equation Therefore, more polynomial first integrals need not be found and the simplest normal form of nonlinear dynamical system can be obtained easily. The example shows that the method is very effective.
Stability Analysis on S Plane Control of Underwater Vehicles
Authors: Li Yue Ming , Zhang Ying Hao , Zhang Guo Cheng , Hu Zhong Hui
Published: October 2013

This paper addresses the stability analysis on S Plane Control in terms of both position and velocity control. Employing Lyapunov stability theory and T-passivity theory, this paper proves the stability of the position controller based on S Plane Control, and on this ground, the stability analysis of the velocity controller based on S Plane Control is done. Finally, the S Plane Control results obtained from the sea trials are given.
The Process Improvement of KISC Roll Collar Grinder
Authors: Wang Hai Rui , Li Ya , Wang Jian Ying , Liao Yong Yi
Published: October 2013

CNC roll grinder, which must be carried out comprehensive analysis in the repair process, is a complex mechanical and electrical integration products . Especially in terms of the mechanical behaviors of the machine tool, performance failure analysis must be carefully. In this paper, the KISC HERKULES grinder analysis of existing fault and improve maintenance. Examples are presented below, for the repair technology.
One Equipment Emission System Fault Diagnosis Device Based on Virtual Instrument Technology
Authors: Lei Lei , Zhang Jian Hu , Yang Shi Liang , Ai Yun Ping , Zheng Xin Liao
Published: October 2013

Based on virtual instrument development idea, one equipment emission system fault diagnosis device is successfully developed, with the characteristics of strong practicability, compatibility and scalability. The successful application of virtual instrument technology has shorten development cycle, reduced project cost, decreased the testing time, simplified the testing process, realized the automation and intelligent of equipment testing process. This paper describes the diagnostic system function, composition and main design method, being of reference value in equipment fault diagnosis field.
The Research on Weighing Metering Systems of Beer Barrel Liquid Filling Machine
Authors: Chen Chao Jun , Fu Zhen Zhou
Published: October 2013

This design is designing for metering system of the beer barrel liquid filling machine. It contains the selection of metering mode and the design of the weighing system mainly etc. The new connection method which is applied multiple weighing sensor constitute the half-bridge measurement circuit which can achieve measuring function of the full-bridge measurement circuit. Not only can this structure increase the stability and shock resistance of the load-bearing platform but also it can solve the problem that generated large error when a single weighing sensor was measuring the object which has different centre of gravity. And this can improve the filling accuracy greatly.
Research and Simulation on Foot Trajectory of Zero-Slippage and Non-Laterodeviation
Authors: Xi Lei , Shang Jian Zhong , Luo Zi Rong
Published: October 2013

In order to test the result of straight-line walking driven by simple cycloid foot trajectory, a kind of quadruped robot is proposed and Adams software is used to simulate the gait. According to the results, the shortage of simple cycloid foot trajectory is analyzed, that the unequal velocity of supporting feet was the key cause of feet-slippage and laterodeviation in the process of simulation. Thereby, the supporting phase of cycloid gait is smoothed, so that the phenomenon of differential in supporting legs is eliminated and the foot velocity is guaranteed to be continuous. After simulation again, the results show that feet-slippage and laterodeviation are solved.
A Prediction Method for Dynamic Performance of Machine Tool Joint Surfaces
Authors: Yang Yao , Yuan Jun Tang , Wang Zhen Hua , Yang Biao
Published: October 2013

The method for dynamic modeling of joint surfaces is proposed to predict dynamic performance of machine tool accurately by virtual material layer elements in this paper. For this process, the numerical relations of contact stiffness and virtual material layer parameters are obtained by finite element theory, and the finite element model is founded by virtual material layer elements and multiple point constrain technique (MPC). Modal analysis of a simple model under different contact stiffness is carried out. It has shown the relative errors between theoretical natural frequencies and simulated ones of this model are less than 2%.
Hypernormal Form at Cubic of Honeycomb Sandwich Plate Dynamics Model
Authors: Li Xin , Li Jing , He Bin
Published: October 2013

Honeycomb sandwich plate have been widly applied in industry design in recent years. In this paper, we study the cubic hypernormal form (the simplest normal form and the unique normal form) for honeycomb sandwich plate dynamics model with the help of Maple symbolic computation. Firstly, we get the average equation of four dimensional cartesian form by using the method of multiple scales perturbation analysis. Based on the method combined new grading function with multiple Lie brackets, we obtain the hypernormal form of cubic truncated. The results will further enrich the research for dynamics of honeycomb sandwich plate model, and is also the basis for higher order normal form research.
Research on the Application of Interferometry in OCT
Authors: Shen Yan , Lu Yun He , Zhang Guo Qing , Yu Wen Bin , Guo Zhi Zhong , Rong Heng
Published: October 2013

This paper applies interferometry into the working principle of optical current transformer (OCT). In this paper, the current in transmission line is monitored by measuring the visibility of interference fringes instead of detecting the intensity of light. This paper represents the working principle of OCT to elaborate the relationship between deflecting angle and visibility. By fitting the measurement function of OCT, it can be obtained that the measurement system can realize the best precision when the angle between the two beams polarization planes is. At last, the performance of OCT system is tested. It shows that when the current is 1000A, the error of the measurement system is less than 1%.
Investigation into Spatial Sensitivity of Probe-Type Electrostatic Sensors for On-Line Condition Monitoring of Heat Engines
Authors: Tang Xin , Hu Zheng , Chen Zhong Sheng , Yang Yong Ming
Published: October 2013

Probe-type electrostatic sensors provide a novel and applicable way to realize on-line condition monitoring of heat engines. However, researches on this type of electrostatic sensors are still scanty, especially needs more detailed studies for the sensors sensing characteristics. In this paper, a simulative 3-D model with high fidelity was established using COMSOL, by which a detailed research on probe-type electrostatic sensors spatial sensitivity was conducted, the whole spatial sensitivity distribution on the centre section and conclusions about the influencing factors of spatial sensitivity were acquired. The simulative results were confirmed by experiments, and can be used for optimal design of probe-type electrostatic sensors.
Research of 220KV Smart Substation Simulation Training System Modeling Method
Authors: Ni Gui Jie , Wu Yang , Zhai Yong Jie , Liu Guo Hong
Published: October 2013

In this paper, the simulation support software and the simulation application software have been used to reappear the functions of 220kv Yanling substation by computer. And the simulation training system provides some functions in control such as dealing with abnormal or accident, operation record. Besides the function of the conventional simulation training system, the function of intelligent equipment operation, and the display and data acquisation are simulated, and the data transmission of MMS nets, GOOSE nets and SV nets are simulated. The relay protection with point-to-point analogy acquisition and point-to-point trip, and the advanced application of a key sequence control, abnormal and accident treatment of the smart substation are also simulated. Now the system has been completed and put into use.
An Underwater Image Real-Time Registration Approach Based on SURF
Authors: Li Chao , Pang Yong Jie , Sheng Ming Wei , Huang Hai
Published: October 2013

In order to meet the demands of real-time performance and robustness for underwater image registration, a novel image registration method based on the SURF (Speeded-Up Robust Features) algorithm is proposed. During the image acquisition process, noise was generated inevitably because of many influencing factors such as atmospheric turbulence, camera defocus during image capturing or relative motion between the camera and the object. Firstly, median filter method was involved during the image preprocessing for underwater image contrast enhancement. Secondly, the SURF algorithm was used to obtain the interest points of the reference and registering images, and the nearest neighbor method was applied to search for coarse matching points. To obtain the precise matching points, the dominant orientations of the coarse matching points were used to eliminate the mismatching points. Finally, the precise matching points were adapted to calculate the mapping relationship between the registering and reference images, the bilinear interpolation method was applied to resample the registering image, and then the registered image was obtained. Experimental results indicated that the proposed preprocessing methods obviously enhanced the image quality, and the introduced image registration approach effectively improved the real-time performance and guaranteed the robustness at the same time.
Nonlinear Vibration Forces of Rotor-Bearing-Support System
Authors: Yang Shu , Zhou Qi Zheng , Wang De Shi
Published: October 2013

The nonlinear vibration forces of rotor-bearing-supports system are important to the structural vibration and sound. Based on nonlinear vibration analysis of the system, the vibration equations were solved and the vibration forces were given by numeral simulation. The results show that the motions of forces are complex with the changing of rotary speed. The results could be used to determine the vibration and acoustic radiation of underwater vehicle under complex excitations.
Pose-Invariant Face Synthesis and Recognition via Sparse Coding and Symmetrical Information
Authors: Zhang Shuai , Wang Hai Rui , He Xiao Li
Published: October 2013

Pose variation which brings illumination change, occlusion and non-linear scale variation, dramatically drops the performance of face recognition systems. In this paper, we propose a novel pose invariant face recognition method, in which we build a joint sparse coding scheme to predict face images from a certain pose to another. By introducing autoregressive regularization and symmetric information, our algorithm could achieve high robustness to local misalignment and large pose differences. Besides, we propose a new coarse pose estimation algorithm by collaborative representation classifier, which is very fast and enough accurate for our synthesis algorithm. The experiment results on multi-pose subsets of CMU-PIE and FERET database show the efficiency of the proposed method on multi-pose face recognition.
Dynamic System Study on Economic Development and its Causal Feedback Relations in Economic System
Authors: Liu De Jun
Published: October 2013

In order to study the relationship of human capital and economic development, we establish the system dynamics model of human capital and economic development. According to the analysis of the system dynamics causal feedback between human capital and economic development, we build a system dynamics flow chart of human capital and economic development by using system dynamics software Vensim languages and tools, and we simulate the development trend of each index variable in human capital and economic for the future.
Impact of 3D Printing Technology on the Development of the Industrial Design
Authors: Zhang Li
Published: October 2013

this paper gives a brief account of the 3D printing concept and a comprehensive analysis of the development status, trend and the application prospect of the industry both at home and abroad. It introduces the application development situation of the 3D technology in the field of industrial design at home and abroad, discusses the potential impact of the 3D technology on the manufacturing, and puts forward the proposal for how the industrial design industry in our country should deal with the industrial revolution brought about by the 3D printing industry.
An Introduction of a Cost Estimation System for Model Changes
Authors: Cho Heung Jae , Park Jae Il
Published: October 2013

In order to be cost competitive in the consumer electronics industry, it is needed to estimate product costs earlier in the design phase. In this study, we reviewed quality and quantity cost estimation techniques to develop a cost estimation system. The qualitative cost estimation technique is used to store expert's knowledge in the form of rules or a decision tree, and quantitative cost estimation techniques is used to extract a similar cost basis based on historical cost data of products. Also, we developed a cost comparison system using these two methods.
The Site Preference of Alloying Element Zr in NiAl Dislocation Core and its Effects on Bond Characters
Authors: Chen Li Qun , Qiu Zheng Chen
Published: October 2013

NiAl is one kind of high-temperature alloys with broad potential applications in aerospace industry. Its mechanical properties are believed to be largely related to the dislocation behavior and impurity-dislocation interaction. In the paper we report first principles study of the alloying effect of Zr in the [10(010) edge dislocation core of NiAl. The binding energy of doping system decreases 3.77 eV when a Zr atom substituted for an Al, only decreases 1.06 eV with substitution for a Ni atom. The result of the binding energy shows that a Zr atom prefers to occupy an Al site in the dislocation core of NiAl. The analyses of the charge distribution, the interatomic energy and the partial density of states suggest that Zr will greatly enhance the interaction between Zr atom and neighboring host atoms, as well as that between host atoms. These results show that the alloying element Zr induced pinning effect on the edge dislocation motion is predicted, and could be helpful for understanding microscopic mechanisms of alloying-induce hardening in NiAl alloy.
Studying the Effect of Different Combinations of Salt Modifier on the Mechanical Properties and Microstructure of A356 Al-Si Alloy
Authors: Ahmad Rafiq , Mumtaz Saima , Ahmad Tahir
Published: October 2013

The present study aims to develop A356 Al-Si alloy using high purity aluminium and various master alloy in gas fired pit furnace. Three different ratio of salt modifier (1:1, 1:2 & 1:3) was used to prepare the casting. Sand casting and permanent mould casting techniques were used to prepare the alloys. Optical microscope and universal tensile testing machine were used for the metallurgical evaluation of the prepared alloy. It was observed that the addition of modifier improved the mechanical properties and microstructure of the alloy. It was also observed that modifying agent NaF with CaCl2in 1:1 ratio has shown the best results in terms of microstructure and the mechanical properties.
Modeling the Effects of Underwater Detonation Wave
Authors: Grządziela Andrzej
Published: October 2013

Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modeled by means of statistical methods. Much more problems arise from modeling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explosion is meant as a violent upset of balance of a given system due to detonation of explosives in water environment. A paper presents a proposal of identification of a degree of hazard the ships hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models.