bluuebunny/crossref_metadata_2025 huggingface dataset:
Linear Stability Analysis in a Compressible Axisymmetric Swirling Jet
Authors: Guo Zhi Wei , Shen Si Min , Feng Wei Min , Wang Bo Fu
Published: July 2014

Temporal linear stability of a compressible axisymmetric swirling jet is investigated. The present work extends a previous analysis to include the effects of swirl number on the stability of flow dynamics. Results obtained show that the optimal growth rate of disturbance for azimuthal wavenumber n = -1 is larger than that for n = -2 while the corresponding frequencies for both n increases as axial wavenumber increases. As swirl number q increases, the optimal growth rate of disturbance also increases. What is more, there is an optimal swirl number for small axial wavenumbers, which is different from the situation for medium and large axial wavenumbers.
Dynamic Response Analysis of MSCSS Constructed with Rubber Vibration Isolator
Authors: Li Tao
Published: July 2014

The seismic responses of the mega-sub controlled structural system (MSCSS) can be reduced effectively based on the combination of the construction and control theory. One of the main construction features of the MSCSS is the connection between the additional column and the mega beam. The rubber vibration isolator is proposed as a new connection mode between the above two components according to the base isolation technique. The dynamic responses of the MSCSS subjected to the earthquake excitation are investigated by employing the probability density evolution method. The analysis results are compared with the seismic responses of the MSCSS constructed with other connection modes. The results show that the seismic responses of the MSCSS constructed with rubber vibration isolator can be reduced effectively, but the effect is not better than the other connection modes.
The Steady-State Thermo-Mechanical Analysis of Turbine Rotor
Authors: Zhuo Ming , Yang Li Hua , Yu Lie
Published: July 2014

Circumferential rod-fastened rotor is one kind of extensively applied structures of gas turbines which work at high temperature to expand hot gas and generate power. The steady-state temperature distribution of the turbine rotor as well as the thermal deformation and stress state were calculated through a thermo-mechanical analysis. A cyclic model of a four-disc rod-fastened turbine rotor assembly was built. A thermal analysis was carried out to obtain the steady-state thermal map of the turbine rotor with the thermal boundary conditions calculated through heat transfer empirical correlations. A static structural analysis was performed to derive the deformation and stress field under both thermal and mechanical loads which incorporate both the pre-tightening force of the rods and the centrifugal force of the rotor itself. The thermo-mechanical results are compared to the result with only mechanical loads applied. The comparison shows the steady-state thermal loads have an influence on the stress state of the rotor and the deformation of the rods.
Research of the Belt Conveyor Starting Acceleration Based on AMESim
Authors: Zhang Guo Qiang
Published: July 2014

Based on AMESim, by the analysis of the Conveyor Belt four discrete model, Select and built the Kelvin-Voigt model which is simple and applicable, by comparative analysis of drawing on four commonly used to start the acceleration (uniform acceleration, triangle acceleration, trapezoidal acceleration and the Harrison), Select the Harrison speed as the starting acceleration and Using AMESim to establish the starting model of acceleration.
Design of the Plant Spacing Adjustable Dibbler
Authors: Lü Xiao Lian , Zang Meng , Lü Xiao Rong , Wu Wei Ming
Published: July 2014

According to the problems that caving device of the mulching film and punching planter that hard to adjust the plant distance problem and the low frequency of use at present, the plant spacing adjustable dibbler was designed for continuously adjustable planting distance of the caving device. The adjustable dibbler can be realize continuous adjustable of plant spacing in certain range, when the planter was working. It is to achieve the aim of a machine used several purposes, expand the scope of use, and improve the frequency of use. By the UGNX virtual prototyping technology, completed the design of the overall structure of the adjustable dibbler. The study provides reference for the design and development of the mulching film and punching planter.
Controlling and Optimization of Steering Wheel Shimmy of the Vehicle at High-Speed Based on FEA Method
Authors: Huang Zong Bin , Xu Bing , Hu Zhao Hui , He Zhi Cheng , Chen Xiong Sheng
Published: July 2014

In this paper, finite element method was adopted to solve the Steering wheel shimmy problem. Firstly, finite element model of the whole steering system from the knuckle to the steering wheel is conducted, and be verified by test. After modeling and verification, it is possible for the FE model to identify a natural frequency that contributes reasonably to the shimmy phenomenon in the steering wheel. Secondly the frequency spectrum of acceleration which is obtained based on test is loaded at the knuckle to simulate steering wheel shimmy. Finally, the sequential quadratic programming is performed to optimize steering system structure and improve the isolation performance based on this model. The plate thickness and stiffness of bushing are set as discrete optimization variables, and the Y-direction acceleration of steering wheel at 12 o'clock is set as the objective function. The successful solution of the steering wheel shimmy of a passenger car proves that this method is efficacious.
Design and Simulation of Golf Putter
Authors: Pan Qi , Chiu Yi Jui , Feng Qi Qi
Published: July 2014

The intention of this paper is to design a brand new golf putter to provide golfers and putter manufacturers with useful information. First, the new golf putter has an innovative club neck and grip. Second, this research is based on the rules of design for three materials, and applied appropriate design parameters. At last, the conclusion is that Aluminum is the best material for the putters, insertion and hollow of the head indeed improve the quality of putting, and the middle-connected club neck is better than side-connected club neck
The Test and Analysis of Nano Mechanical Properties for Dragonfly Wing
Authors: Pan Chun Xiang , Qi Xiao Yan , Zhao Guang , Guo Xu Zhuo
Published: July 2014

nanomechanical testing system in this paper has been applied to get elastic modulus and hardness of dragonfly wing, and showing their gradient changes along the wing, and also analyzing the mechanical properties in nanodimension. It is significant to make a further research for specific biological functions of dragonfly wing.
Design and Research on Redundancy of Fuel Oil Systems for the Crane/Pipe-Laying Vessel Based on DP3 Requirements
Authors: Liu Yun Xin , Wang Qiang
Published: July 2014

To realize the crane/pipe-laying function safely and reliably, the redundancy of fuel oil systems of a certain crane/pipe-laying vessel is designed according to the relative requirements of the third class dynamic positioning (DP3) in regulations and the characteristics of the vessel arrangement. The DP3 requirements of the redundancy of fuel oil systems for the vessel are satisfied by means of the arrangement of generator sets, the system subgroup and the redundancy configuration of the units.
Simulation and Analysis of Ride Comfort of 4WD Electric Vehicle
Authors: Yang Wei Hua , Li You Rong , Fang Zi Fan , He Kong De
Published: July 2014

Taking the independent four motorized wheels driving electric vehicle (4WD EV) as study object, the method and index evaluating ride comfort of automobile suspension system were described, and the input model of random road excitation and the dynamics model of 1/4 vehicle vibration system were established, then the simulation of ride comfort of the established model was conducted, so the evaluating indexes’ responses in time domain and frequency domain were obtained. Above all, the changes of these indexes which are suspension damping, spring stiffness and un-sprung mass were analyzed, their effects on the ride comfort of electric vehicle driven by motorized wheel studied, thus provided reference for the development of electric vehicle driven by in-wheel motor.
Fracture Design Parameters of Middle Carbon Steel in Extra-Low Cycle Bend Torsion Loading
Authors: Duan Hong Yan , Zhang Huan Rong , Zheng Ming , Wang Xiao Hong
Published: July 2014

The fracture problems of medium carbon steel under extra-low cycle bend torsion fatigue loading were studied using artificial neural networks (ANN) in this paper. The ANN model exhibited excellent comparison with the experimental results. It was concluded that predicted fracture design parameters by the trained neural network model seem more reasonable compared to approximate methods. It is possible to claim that, ANN is fairly promising prediction technique if properly used. Training ANN model was introduced at first. And then the Training data for the development of the neural network model was obtained from the experiments. The input parameters, the presetting deflection and notch open angle, and the output, the cycle times of fracture were used during the network training. The neural network architecture is designed. The ANN model was developed using back propagation architecture with three layers jump connections, where every layer was connected or linked to every previous layer. The number of hidden neurons was determined according to special formula. The performance of system is summarized at last. In order to facilitate the comparisons of predicted values, the error evaluation and mean relative error are obtained. The result show that the training model has good performance, and the experimental data and predicted data from ANN are in good coherence.
Earthquake-Response Analysis of Long-Span Cable-Stayed Bridge under Uniform and Non-Uniform Excitations
Authors: Xu Kai Yan
Published: July 2014

Earthquake is a kind of natural disaster which is difficult to predict and the damage degree is very great, occurrence of the strong motion often leads to the tremendous life and property loss. Bridge is very important lifeline engineering and it is very necessary to conduct the comprehensive and systemic investigation on the bridge aseismic. In this paper, the FEM model of a long-span cable-bridge was established; the dynamic characteristic and nonlinear seismic responses under uniform and non-uniform excitations of it were systematic studied. The results show that: 1) the basic cycle of it is about 8.881s. Its first mode of vibration is longitudinal floating mode, which is favorable to the earthquake-response of structures. 2) Its former 40 rank frequency are located between 0.1~2Hz which is avail to the condition of traffic condition.3) the geometric nonlinearity has much influence on the response of this kind of bridge.4) the seismic responses are sensitive to the frequency spectra of the input earthquake wave. 5) The traveling wave excitations are unfavorable to the design of tower and the main girder when considering the three orthogonal seismic wave input. In order to get correct results, artificial seismic wave of the bridge address is necessary to the time-history analysis.
First-Principles Study on Hydrogen Desorption Properties of Li4BN3H10 Doped by Chlorine Anion
Authors: Du Cui Cui , Zhang Tong Shuo , Gao Tian Fu , Huang Ren Zhong
Published: July 2014

The hydrogen storage properties of Li4BN3H10doped by Cl anion are investigated by using first-principles method based on density functional theory. According to the calculated results of formation enthalpy and substitution enthalpy, Cl-doping may result in the substitution of H by Cl-in the hydride lattice and accordingly, a favorable thermodynamics modification. The electronic structure analysis indicates that the main peak of H-1s moves close to Fermi level when substituting H-by Cl-. The stability of hydrogen in the doped hydride is lowered compared with that in the hydride without doping, which improves the hydrogen desorption properties of the hydride.
Vibrational Frequencies Calculation of Fluid Conveying Pipes Based on Fluid-Structure Coupling and Acoustic-Structure Coupling Models
Authors: Guo Wen Jie , Li Tian Yun , Zhu Xiang , Zhu Xian Ming
Published: July 2014

Two coupling models, the fluid-structure coupling and the acoustic-structure coupling, have been studied in this paper, in order to describe the free vibration of a fluid-filled cylindrical shell under internal pressure from two different angles. For both models, a new approach to solve the characteristic equation is presented, using the Galerkin method to obtain the natural frequency of each mode. The comparison shows the results of two models are in good agreement. Although the two models are based on different mechanical theories, the mathematic essences are confirmed to be the same, both derived from Bessel functions.
Physical and Mechanical Properties of Alnus Formosana Wood Introduced into Sichuan
Authors: Chen Ming , Lyu Jian Hua
Published: July 2014

The mechanical and physical properties of Alnus formosana wood from Sichuan, China were studied. Air-dry density, oven-dry density, basic density, shrinkage, swelling, parallel-to-grain compressive strength, parallel-to-grain tensile strength, modulus of rupture (MOR),modulus of elasticity (MOE) ,impact toughness were analyzed. Results from this study show that air-dry density, oven-dry density and basic density were respectively 0.52, 0.49 and 0.43g/cm3. The average value of volumetric shrinkage was 7.111% and the average value of volumetric swelling was 7.06%. The average values of modulus of elasticity (MOE) ,modulus of rupture (MOR), parallel-to-grain compressive strength, parallel-to-grain tensile strength and impact toughness were 8102.429 Mpa, 80.429 Mpa, 41.575Mpa, 81.542 Mpa and 47.406 Kj/m2 , respectively. This study solved a basic problem about the planting and utilization of Alnus formosana wood in Sichuan, China.
Analysis of ABS Plastic and Concentric Cylindrical Shells’ Chemical Detonation Scatter Process
Authors: Shen Yue Guo , Du Nai Juan , Zhang Jun Hai
Published: July 2014

In this paper, basing on the FAE theory, simulating the process of scatter from chemical detonation about ABS plastic and concentric cylindrical shell according to experiment, on the basis of the assumption that the initial moment of the explosion being at the source ,we analyzed the gaseous phase motion equation and liquid ring controlling equation, and build the liquid ring movement mathematical model, then analyze the scatter process according to the chemical detonation scatter experiment, and classify the chemical detonation scatter into acceleration phase and deceleration phase, form the initial fog group, then we can reveal the mechanism of changing the chemical detonation into the fog. After the initial fog being formed, the effect of the chemical detonation disappeared, and the water molecules are uniformly dispersed into the air.
Ontology and Multi-Agent Based Intelligent Retrieval Model for Power Quality Monitoring Information
Authors: Yin Jia Fu , Suo Juan , Tan Dan
Published: July 2014

A power quality monitoring information intelligent retrieval model based on ontology and multi-Agent is proposed. Combining ontology technology with multi-Agent technology, establish a four layer alliance structure of the intelligent retrieval model. At first, the function of the model for each layer has been described in detail. Then, the concrete building method of the power quality ontology knowledge base which is the core part of the model has been explained. Finally, example analysis shows the whole intelligent retrieval process. Each layer of the model uses agent alliance mode, according with the demand of intelligent retrieval; realizing the user's retrieval request with the aid of ontology knowledge base can not only improve retrieval efficiency, but also realize deep mining of the basic retrieval information. Example analysis shows that the model can realize intelligent retrieval quickly and efficiently and have certain practical value.
An Optical Inspection System for Chip Defects Using a High Rate Line Scanner
Authors: Chen Ming Fu , Chou Chih Chung , Lien Chun Jie , Weng Rui Cian
Published: July 2014

Based on a line scan imager, we propose anew defect inspection system to precisely identify defects with size of greater than criteria from chip backside. Only a corresponding raw image is acquiredfor each chip,and using anopto-mechanical device with very low geometry distortion to make it feasible to neglectprocesses of image calibration and mosaic. Defect inspection is based on a binary chip edge image and a novel methodof using edge pixels statistic. Thus defect size of crack, chipping and glue can be inspected quantitatively and efficiently.From test results by integrating inspection system with experimental and operational chip sorters, our system has capabilities of maximal chip moving speed of0.7 m/sec (5μm resolution) andinspecting chip defects with size accuracyof less than 1.0 pixel. Proposed system has features of automatically acquiring chip images during packaging process, improving performance of image processing and defects inspection. Moreover, manpower, time and cost for chip defect inspection manually can be saved. Chip quality control can be improved as well comparing with the one by manual way.Developed system has been integrated with operational chip sorters successfully for sale now.
Research on Transformer Fault Diagnosis Method Based on Artificial Immune Network and Fuzzy C-Means Clustering Algorithm
Authors: Wang Fu Zhong , Shao Shu Min , Dong Peng Fei
Published: July 2014

The transformer is one of the indispensable equipment in transformer substation, it is of great significance for fault diagnosis. In order to accurately judge the transformer fault types, an algorithm is proposed based on artificial immune network combined with fuzzy c-means clustering to study on transformer fault samples. Focus on the introduction of data processing of transformer faults based on artificial immune network, the identification of transformer faults based on fuzzy c-means clustering, and the simulation process. The experimental results show that the proposed algorithm can classify power transformer fault types effectively, and the algorithm has a good application prospect in the transformer fault diagnosis.
On-Line Detection of the Coal Mine Power Cable Parameters Based on the Method of Low Frequency Signal
Authors: Wang Fu Zhong , Dong Peng Fei , Shao Shu Min
Published: July 2014

The coal mine power supply mainly rely on cable, its insulation level directly affects the coal mine safety production. Has long been lack of perfect insulation parameters online detesting equipment, the traditional detection methods need to stop the normal grid power supply, affect the normal production of coal mine, it is great significance that research a kind of on-line insulation parameters detection equipment. Using three-phase reactor in the neutral point insulation system to make artificial neutral point, from this point inject low-frequency voltage signal, the signal through the cable ontology, cable to ground insulation resistance and capacitance, and to a loop resistor. Measure the voltage and current signals and modulus conversion, using DSP to realize rapid changes of Fourier algorithm, can quickly and accurately calculate the cable to ground insulation parameters. The algorithm is effective to solve the traditional measuring circuit transformer reactance and unbalance current's influence to the accuracy of measurement, measurement process will not affect the normal operation of the electric power system, the insulation parameters can be accurately measure online.
Multiplexing Technology Research of Fiber Optic Gyroscope
Authors: Yang Dong Sheng
Published: July 2014

:Proposed in this paper the multiplexing technology of three axis of fiber optic gyroscope integrated design technology, this kind of fiber optic gyroscope has high reliability, fast operation and reaction, triaxial output synchronization, three axis scale factor and its nonlinear affected by light source is the same, and small volume, light weight, low consumption, especially suitable for gyro miniaturization, lightweight requirements to weapons system.
Design and Simulation of Synchronization Control for a Dual-Output Forward Converter
Authors: Cheng Hong Li , Xia Jun , Ni Yun Feng
Published: July 2014

Since high utilization and high output efficiency of forward converter transformer, it is often used in multiple-output DC voltage occasions. But the cross regulation in multiple outputs has affected the performance of forward converter. For this problem, a synchronization control model for a dual-output forward converter is proposed in this paper. That is, the master output is identified by calculating the desired power of dual outputs, and the other is the slave. Then it controls duty cycle of primary switch and master rectifying switch by employing closed-loop PID voltage-mode control. Simultaneously, it is to control duty cycle of rectifying switch in the slave by comparing sampled voltage with desired voltage. Simulation results demonstrate that cross-regulation problems can be solved effectively by this control method, and get a higher voltage accuracy of master output and slave output.
Fuzzy Impulsive Control of Permanent Magnet Linear Synchronous Motors
Authors: Guo Yun Yun , Wang Hui
Published: July 2014

The permanent magnet linear synchronous motors (PMLSMs) may have chaotic behaviors. So the Takagi-Sugeno (T-S) fuzzy impulsive control model for PMLSMs with parameters uncertainties is established. The stability for PMLSMs is derived by Lyapunov method and matrix analysis. An illustrated example is also given to show the effectiveness of our results.
Sensitivity Analysis of Carrier Aviation Support System Based on Fuzzy-ANP
Authors: Yu Yong Tao , Ding Ying
Published: July 2014

System sensitivity is an important basis for carrier aviation support system design and improvement. According to research presented fuzzy network analysis (Fuzzy-ANP) to achieve sensitivity analysis of carrier aviation support system. The first is based on ANP method to establish sensitivity analysis network model of carrier aviation support system, followed by the application of fuzzy theory to determine the weight of sensitivity analysis index, and finally enter specific technical parameters based on secondary subsystem or device of carrier aviation support system, sensitivity analysis, corrected analytical model, proposed carrier aviation support system design suggestions.
Parallel Vibration Isolation Platform Using Magnetorheological Technology
Authors: Wang Qiang , Chen Zhao Bo , Ahmadian Mehdi , Liu Wen Tao
Published: July 2014

Within this work, a six-axis parallel vibration isolation platform with semi-active control ability is investigated. Traditional magnetorheological (MR) dampers could supply large output force and long stroke, but it also comes with a large self-weight. This problem is more serious when several MR dampers are needed in a parallel platform. Firstly, a double-piston MR damper have been developed, which will brings a small self-weight feature to the damper. Hyperbolic tangent model have been used to describe damper's nonlinear hysteresis. Using six of this double-piston MR damper, a parallel vibration isolation platform based on a cubic Stewart platform mechanism has been designed. Dynamical model of this platform has been built and simulated. Numerical simulation results in frequency domain indicate that the parallel semi-active vibration isolation platform has desirable vibration isolation properties in all six axes.
Research on the Designing and Checking Method for Electric Actuator Used on Supersonic Speed Target Cruise Missile
Authors: Zhang Dong Xu , Zhang Jiao , Liu Yuan Xiang
Published: July 2014

According to the control strategy of the supersonic speed target cruise missile and the demand of the actuator, the principle of choosing motor and the method of designing electric actuator were presented. The mathematic model of the electric actuator was built with the actual parameter and the checking method of the dynamic characteristic of the electric actuator was described. With the mathematic model and the actual electric actuator designed, the numerical simulation and the experiment on turret were made. The conclusion showed that the electric actuator designed with the designing and checking method described met the control demand of the target missile.
Sea-Battlefield Situation Assessment Based on Improved Decision Tree
Authors: Yu Yong Tao , Ding Ying
Published: July 2014

How to efficiently evaluate the dynamic changing sea-battlefield is the key of command decision. According to research sea-battlefield situation assessment based on improved decision tree algorithm based on derived attributes. First is based on the decision tree algorithm to establish the sea-battlefield situation assessment initial decision tree. Second are dynamically generated derivative branches set based on derived attributes. Once again, it can be grafting and pruning derivative branches to form the sea-battlefield situation assessment derived decision tree model. Finally, it may use a derived dynamically decision tree model assess sea-battlefield in different time slices.
Embedded Software Formalization Testing Method and its Application in Missile-Borne Software
Authors: Ma Ji Cun , Qi Xing Lin , Lv Jing
Published: July 2014

The formal modeling method can accurately describe systems. Using formal method to test software improves the efficiency of software testing and it is comprehensive. Common real-time embedded software formal testing methods include Z language, finite state machine (FSM) and unified modeling language (UML), Petri net and time input/output automata (TIOA). This paper analyzes the characteristics of embedded software testing. The above formal methods and test case coverage criterions and test data collection methods are introduced. Combined with the characteristics of missile-borne software, this paper presents suitable ideas of testing missile-borne software.
A Method for Computing Logarithms of K-Circulant Matrices
Authors: Mei Ying
Published: July 2014

In this paper, we present an efficient algorithm for computing the logarithms ofk-circulant matrices. And then we prove that nonsingulark-circulant matrices always has infinitely manyk-circulant logarithms.
Generalized Hybrid Dislocated Function Projective Synchronization of Chaotic Systems with Time Delay
Authors: Li Rui , Zhang Guang Jun , Zhu Tao , Wang Xu Jing , Dong Jun
Published: July 2014

In order to improve the security of secure communication, a novel generalized hybrid dislocated function projective synchronization (GHDFPS) was proposed and GHDFPS of time delay chaotic systems with uncertain parameters were researched in this paper. Due to time delay, the chaotic system can produce multiple positive Lyapunov exponential; this characteristic can enhance security in secure communications noticeably. Based on Lyapunove stability theory and modified hybrid feedback control method, the modified hybrid feedback controller and the parameter updating laws were designed for the GHDFPS between the two time delay chaotic systems with uncertain parameters. The feedback gain can be adjusted automatically according to the synchronization error values. Under the controller, generalized hybrid dislocated function projective synchronization of the two chaotic systems is achieved, and the uncertain parameters of response systems are identified. The chaotic item is added in the function scale factor. The chaotic item in the function scaling factor makes function scaling factor more complex and unpredictable. So this can enhance the features of indeterminism in secure communication. The time delay feedback Lorenz system as an example; by numerical simulations the effectiveness of the proposed method is demonstrated.
Feature Extraction Method for Rolling Bearing’s Week Fault Based on Kalman Filter and FSK
Authors: Liu Zhi Chuan , Tang Li Wei , Cao Li Jun
Published: July 2014

Aiming at the problem that traditional demodulated resonance technology has the deficiency of difficulty to choose the parameters of band-pass filter, Kalman filter technology and fast spectral kurtosis were combined for fault feature extraction of rolling bearing. AR model was firstly built with gearbox original vibration signals, and then model order was ascertained with AIC formula, and finally model parameters were calculated with least-squares method. The original signals were pretreated by Kalman filter. Fast spectral kurtosis (FSK) was used to choose parameters of the best band-pass filter, and finally fault diagnosis was achieved by the energy operator demodulation spectrum analysis of band-pass filtered signal. The analysis result of engineering signals indicated that fault feature extraction method based on Kalman filter and fast spectral kurtosis can primely provide a new feature extraction method for rolling bearing’s week fault.
Sparse Representation of Vibration Signals Using Trained Dictionary
Authors: Guo Jun Feng , Zheng Xiao Hui , Wei Xing Chun , Feng Rui Cheng
Published: July 2014

The sparsity of a signal is critical for compression and high compression performance is obtained by utterly sparse signal. But real signals are not sparse commonly, so sparse transformation is considered. In addition, the sparse degree of coefficients is mainly determined by the quality of transform base. Therefore, this paper constructs a transform base (trained dictionary) by K-SVD algorithm for rolling element bearing vibration signals and uses the Orthogonal Matching Pursuit (OMP) algorithm to conduct sparse representation and simulation. Results show that the trained dictionary can be more fitted with the features of signals, the residual components are smaller and the reconstruct similarity is higher compared to the untrained dictionaries, obtaining better representation.
Cutting Institutions Running State Estimation Strategy Based on Wavelet Packet Analysis Technology
Authors: Wang Fu Zhong , Tian Xiao Ying
Published: July 2014

During robotic heading machine working, it often encounters the coal seam hardness changing tremendously. So the cutting mechanism will be easy to break down. For this problem, put forward a strategy, which using wavelet packet technology to study the vibration signal of cutting mechanism. Filtered the signal with wavelet packet; extracted vibration signal characteristics; established the energy eigenvector; used the Hilbert technology to extract frequency characteristics. According to the energy eigenvector and the frequency characteristics, estimated the cutting mechanism running status. The simulation in MATLAB proves that the control strategy can estimate the running state of cutting mechanism real-time, and lay an important foundation for the realization of coal mine roadway drivage unmanned working face.
Continue Wavelet Transform's Analysis in Zhuji Station's Rainfall Sequence Transformation
Authors: Guo Hui Fang , Sun Zheng Dong , Chen Yu Liang
Published: July 2014

In this paper, it uses continuous wavelet transform in analysing zhuji station monthly rainfall. from the transformed wavelet coefficients’ real component, variance and modulus square, we can get the main measure contained in zhuji’s monthly rainfall sequence. By anlysing the transformation process of continuous wavelet transform coefficien’s real part of various scales, we can get zhuji station’s monthly rainfall sequence wet-dry transformation process of various scales. By caculated , we found zhuji station’s monthly rainfall sequence contains 10 month , 171 month and 393 month scale. In large scales, zhuji station’s rainfall is in hemiplegia period from 2013 to 2021. in small scale, zhuji station’s rainfall shifts strongly.
The Application of Cloud Technology in University Computer Lab’s Management
Authors: Wang Hong
Published: July 2014

Campus Cloud is the most important part of the cloud, plays an important role in the university computer lab management. This paper describes the concept of cloud computing and explores the designing scheme as how to use cloud technology of system management in college computer laboratory. Compared with traditional computer applications, this new model is more flexible, safer and greatly improved in work efficiency.
Research and Implementation of Safety Management Information System in Metro Operation Enterprise
Authors: Jia Chong Qiang , Meng Ya Dong , Guo Hua Jun
Published: July 2014

Safety management information system is an important component of metro operation enterprise. Based on the sufficient demand analysis of metro operation enterprise, this paper puts forward the structure of metro safety management information system and construction of subsystem, and describes the functions of related subsystem.
Finite Element Analysis on Capsule End Faces of the Impact Toughness Tester
Authors: Yang Hui , Mai Lv Bo , Lu Can Hua , Tong Yi , Wang Zhi Tao , Zhang Feng Ling , Huang Feng Lei
Published: July 2014

Toughness index is an important parameter of the quality of super-abrasive grits. In order to improve the design of the toughness index tester more reasonably and efficiently, we calculated the velocity of a steel ball in the capsule and simulated the impact process between the steel ball and the different capsule end faces with the ANSYS/LS-DYNA. The main results are as follows: (I) the maximum velocity of the ball is approximately 2.0106m/s. (II) with the increase of the curvature, the maximum value of normal stress declines while the effective area rises. (III) the maximum shear stress cannot cause diamond grits to break directly, but it can make small cracks and defects of the impacted grits propagate. These assertions are validated by the simulation which explains the experimental phenomenon well.
Fracture Failure Mechanism Analysis on LP Blades of a Gas Turbine
Authors: Liu Ben Wu , Wang Jian Jun
Published: July 2014

The fracture phenomenon, mechanism, characteristic and reason of LP second stage blade of certain type gas turbine are systematically studied. The damaged trace, fracture appearance, material composition, metallographic structure to LP second stage blade of certain type gas turbine are first analyzed; and then the vibration characteristic is analyzed combined with LP second stage blade working state and structure features; and then the vibration characteristic calculation analysis is performed combined with LP second stage blade working state and structure features. The analysis indicates that fracture feature of the LP second stage blade belongs to HCF fracture; there is an original manufacture defect of shallow gully shape in the area of fatigue source, and the fatigue fracture of blade is related to the defect; finally, preventive measures to LP second stage blade are proposed pertinently.
Hermite Reproducing Kernel Meshfree Thermal Buckling Analysis of Euler-Bernoulli Beams with Elastic Foundation
Authors: Song Chao , Sun Ming , Dong Bo Ya
Published: July 2014

The Hermite reproducing kernel meshfree method is employed for the stability analysis of Euler-Bernoulli beams with particular reference to the thermal buckling problem. This meshfree approximation employs both the nodal deflectional and rotational variables to construct the deflectional approximant according to the reproducing kernel conditions. In this paper, we apply this HRK meshfree method to the thermal buckling analysis of Euler-Bernoulli beam on elastic foundation. By comparison to the Gauss Integration method, HRK meshfree method shows much better solution accuracy.
Internal Flow Analysis of SCR-Exhaust Aftertreatment System
Authors: Ren Lin Lin , Ding Wei , Zhang Zhe , Chen Tao , Bi Ming Xin , Zhang Ying Chao
Published: July 2014

Selective Catalytic Reduction system (SCR) has made great contributions to diesel engine NOx control technology. The gas flow condition in exhaust pipe has a great effect on catalytic reduction reaction of SCR, especially the airflow through carriers. In this paper, CFD technology was used to simulate the internal flow field, and analyze the gas flow uniformity, which would give us reasonable suggestions to optimize the structure of SCR-Exhaust aftertreatment system.
Mechanical Properties of Chopped Randomly Oriented Epoxy - Luffa Fiber Reinforced Polymer Composite
Authors: Panneerdhass R. , Baskaran R. , Rajkumar K. , Gnanavelbabu A.
Published: July 2014

This paper presents the study of the tensile, compressive, flexural, impact energy and water absorption characteristics of the luffa fiber reinforced expoxy polymer composites. Luffa fiber reinforced epoxy resin matrix composites have been developed by hand lay-up technique with varying process parameters such as fiber condition (treated and untreated), chopped randomly oriented and different volume fraction (30%, 40% and 50%). Tensile strength varies from 9 MPa to 20 MPa, compressive strength varies from 75 MPa to 105 MPa, flexural strength varies from 15 MPa to 140 MPa and impact energy varies from 0.25 Joules to 1.45 Joules, as a function of fiber volume fraction. The optimum mechanical properties were obtained at 40% of fiber volume fraction of treated fiber composites. Fracture surface of the composite shows that pull out and de-bonding of fiber is occurred.
Analysis of AlSi CNT Composite Coating on Al6061 and SS304L Substrate by Plasma Spray
Authors: Kumar R. , Madhu S. , Balasubramanian M.
Published: July 2014

Recent trends shows powder metallurgy composites are most familiar due to its wide applications in the areas like defense, aircraft, automobile, sports etc. Powder metal mixtures are prepared for surface coating in the areas where high corrosive and heat resistance are required. Carbon Nanotubes are widely used in the field of engineering with its remarkable mechanical, electrical properties and very good reinforcement in composite preparation. In this research, multi wall Carbon Nanotube along with Aluminum and Silicon powder were mixed thoroughly by ball milling process. The powder mixture (AlSiCNT) reveals that Carbon Nanotube are well dispersed uniformly with Aluminum and Silicon which promotes toughening mechanism with good reinforcement. The AlSiCNT mixture is then coated over the surface of Aluminum alloy 6061 and Stainless steel 304 L by plasma spraying technique. Tensile test, micro hardness tests with micro structural study were carried out over the composite. Coated composite reveal better mechanical properties than the base metals.
A Review on CNT Reinforced Aluminium and Magnesium Matrix Composites
Authors: Ramnath B. Vijaya , Parswajinan Chakravarthi , Elanchezhian Chinnadurai , Pragadeesh S. Venkatesan , Ramkishore P. Ravichandra , Sabarish Vengkataramana
Published: July 2014

Carbon Nanotubes (CNT) are one allotropic form of carbon, which have some unique characteristics that make them a suitable reinforcing agent in various types of composites. CNT reinforced composites are gaining more attention in recent days. Reinforcing with CNT leads to increase in strength without considerable increase in weight. Many metal matrix composites (MMCs) with base metals like aluminium, magnesium, copper, nickel etc., and polymer matrix composites (PMCs) have been fabricated and experimented with CNT as one of their reinforcing agents and corresponding results have been recorded. This paper reviews a few of these recordings on Al and Mg MMCs and also some future development in this field.
Modelling and Analysis of Extrusion Die and Bolt Ejector Pin
Authors: Ramnath B. Vijaya , Chandrasekhar Vishal , Pithchai Pandian S. , Sundarrajan R. , Santhosh Shankar A. , Vickneshwaran S.
Published: July 2014

The computer aided tools and recent developments of engineering, emphasizes the importance of bringing manufacturing process into early stage for product and process design. The implied significance is that it becomes vital to reduce cost of product by extensive use of CAD tools for product formation without actually building the product. In this paper, CAD tools are used to design an extrusion die for bolt ejector pin. In this paper, the extrusion die used to produce the pin is modeled using Pro-E, a CAD tool. Then, the die is analyzed for the maximum extrusion load condition using ANSYS software, a Finite Element Analysis simulation (FEA) tool. The simulation results are compared with yield stress of material. After the die has been designed, the pin was extruded using the die. In order to evaluate the strength of extruded pin, the pin was also modeled and analyzed using ANSYS tool where it was found to be safe for its maximum ejection load condition.Keywords:Extrusiondiedesign,ejectorpin,Computeraidedmodelling(CAD),FiniteElementAnalysis(FEA).
Computational Complexity Analysis of Selective Breeding Algorithm
Authors: Chandrasekaran M. , Sriramya P. , Parvathavarthini B. , Saravanamanikandan M.
Published: July 2014

In modern years, there has been growing importance in the design, analysis and to resolve extremely complex problems. Because of the complexity of problem variants and the difficult nature of the problems they deal with, it is arguably impracticable in the majority time to build appropriate guarantees about the number of fitness evaluations needed for an algorithm to and an optimal solution. In such situations, heuristic algorithms can solve approximate solutions; however suitable time and space complication take part an important role. In present, all recognized algorithms for NP-complete problems are requiring time that's exponential within the problem size. The acknowledged NP-hardness results imply that for several combinatorial optimization problems there are no efficient algorithms that realize a best resolution, or maybe a close to best resolution, on each instance. The study Computational Complexity Analysis of Selective Breeding algorithm involves both an algorithmic issue and a theoretical challenge and the excellence of a heuristic.
Optimization of Total Holding Cost in Job Shop Scheduling by Using Hybrid Algorithm
Authors: Gobinath S. , Arumugam C. , Ramya G. , Chandrasekaran M.
Published: July 2014

The classical job-shop scheduling problem is one of the most difficult combinatorial optimization problems. Scheduling is defined as the art of assigning resources to tasks in order to insure the termination of these tasks in a reasonable amount of time. Job shop scheduling problems vary widely according to specific production tasks but most are NP-hard problems. Mathematical and heuristic methods are the two major methods for resolving JSP. Job shop Scheduling problems are usually solved using heuristics to get optimal or near optimal solutions. In this paper, a Hybrid algorithm combined artificial immune system and sheep flock heredity model algorithm is used for minimizing the total holding cost for different size benchmark problems. The results show that the proposed hybrid algorithm is an effective algorithm that gives better results than other hybrid algorithms compared in literature. The proposed hybrid algorithm is a good technique for scheduling problems.
Improved TCP Congestion Control Mechanism for Multihop Wireless Networks
Authors: Sankara Malliga G. , Meeradevi T. , Umaparvathi M. , Parvathavartini B. , Thayammal S. , Sriramya P.
Published: July 2014

Transmission Control Protocol (TCP) is working well in wired networks. TCP needs modification to work well in wireless networks. This work analyses the performance of the proposed two TCP cross layer flavours, namely the TCP-AL and TCP-WPAL. The cross layer interaction (TCP-WPAL) produces better performance than the TCP-AL. The PDR (Packet Delivery Ratio) of the TCP-WPAL is increased, and the delay and jitter of the TCP-WPAL are decreased in multihop wireless networks. Keywords: TCP, Wireless networks, TCP-AL and TCP-WPAL
Improving the Hardness of a Wind Turbine Gear Surface by Nitriding Process
Authors: Sakthivel P. , Rajamani G.P.
Published: July 2014

This paper presents a surface hardness improvement methodology of a wind turbine helical gear which is made up on EN36 alloy steel material. Now days the wind turbine gears are frequently failed due to high contact stress, due to sudden impact load, change of wind speed and wind directions. Pitting is a method of surface failure in a gear. So, to avoid the gear failures we need to improve the surface hardness of wind turbine gears by using Nitriding process. There are three modes of hardness test taken from this process to improve the hardness. They are before nitriding, after nitriding & without nitriding. By comparing the hardness test values, Gas Nitriding is the best suitable process to increase the surface hardness of a large size gear. By the method of improving surface hardness of wind turbine gear, the load withstanding capacity of the wind turbine gears are increased, pitting failure may be avoided at a desired level and the power production rate is increased.
Super Strongly Perfect Graphs in the Selection of Cluster Heads in Wireless Sensor Networks
Authors: Mary Jeya Jothi R. , Roslin S. Emalda , Nandhitha N.M.
Published: July 2014

Wireless sensor network comprises of dense sensor nodes which are randomly deployed. Major challenges in WSN are limited battery source and computation capacity. Considerable research has been carried out in the area of maximizing battery lifetime by reducing the energy consumption. Once such proposed technique involves hierarchical topology control. Conventionally proposed algorithm for hierarchical topology control involves computationally intensive soft computing tools. It leads to higher energy consumption in the sink node. Hence it necessitates computationally less intensive technique for cluster head selection. In this paper, an efficient cluster head selection is proposed using minimal dominating set in Super Strongly Perfect (SSP) graph.
Formability Analysis of AA6061 Aluminium Alloy at Room Temperature
Authors: Loganathan D. , Gnanavelbabu A.
Published: July 2014

Formability of AA6061 T4 mainly depends upon the physical and mechanical properties of the materials. This study focuses on the effect of annealing at different soaking temperature with furnace cooling conditions. Effects are investigated at three orientations 0o, 45o, and 90o to the rolling direction of sheet metal. The value of plastic strain ratio and strain hardening exponent at three orientations were evaluated.
Influence of SMA Short Fibers on Mechanical Properties of Copper/GFRP Composites
Authors: Pazhanivel Kaliyaperumal , Bhaskar G.B. , Venkatesan N. , Anandan P. , Arunachalam Sabapathy
Published: July 2014

Plain GFRP, copper wire embedded GFRP and SMA short fibres included copper wires embedded GFRP laminates have been prepared by hand lay-up method. The mechanical properties like flexural and tensile strength were investigated. To study the impact properties of the laminates an experimental set up was designed and the impact strength of the laminates was studied by drop weight method. Three point bend method was adopted for flexural studies and the tensile strength was found by Instron Machine. It is found that the inclusion of SMA short fibres significantly improved the mechanical properties of the composites.
Amperometric Determination of L-Ascorbic Acid Using Copper Hexacyanoferrate Nanoparticles Modified Electrode
Authors: Kalaivani R.A. , Sriman Narayanan S.
Published: July 2014

A new approach was attempted to prepare a chemically modified electrode using copper hexacyanoferrate (CuHCF) nanoparticles as the redox mediator and to study its stability and electrocatalytic activity for ascorbic acid (AA) oxidation. The CuHCF modified electrode was prepared and characterized using cyclic voltammetry. The effect of scan rate, supporting electrolyte and pH of the medium on the performance of the modified electrode was investigated. The CuHCF modified electrode exhibited good electrocatalytic activity towards the oxidation of ascorbic acid and gavea linear response4×106M to 4.9×10-4M with a correlation coefficient of 0.995). Hydrodynamic voltammetry and chronoamperometry studies for the oxidation of ascorbic acid were also carried out. The electrode was highly stable and exhibited good reproducibility. This modified electrode was also applied for the determination of ascorbic acid in commercial samples.