bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling and Solution of a Nonlinear Vibration Model of the Bending-Torsion Coupled Spur Gear Transmission System Based on Lumped Mass Method
Authors: Li Chang , Wang Bing Chen , Han Xing
Published: September 2014

After comprehensive considerations of the influences of stiffness excitations, deviation excitations, meshing impact excitations, friction of tooth surfaces, gap changes and other kinds of nonlinear factors, it established a nonlinear vibration model of the bending-torsion coupled spur gear driven system based on Lumped Mass Method (LMM). By transforming the model to dimensionless form and using fifth order adaptive variable step (Runge-Kutta) method to solve the nonlinear vibration model of the system, it can get the time domain charts, spectrum charts, phase charts, Poincare charts, FFT charts and the system bifurcation figures. And then it discussed the influence of system parameter vibrations on its dynamic characteristics, and this could provide a foundation for system dynamic optimization design
Research on QoS Multicast Tree Based on Ant Colony Algorithm
Authors: Huang Yong
Published: September 2014

Ant colony algorithm is a stochastic search algorithm, evolutionary algorithm with other models, like the evolution of the composition of the population by the candidate solutions to find the optimal solution, this paper proposes a new ant colony algorithm to solve by bandwidth and QoS multicast routing problem delay constraints, k shortest path algorithm by means of genetic algorithm we propose obtained, and then use the ant colony algorithm to construct optimal multicast tree for data transmission.
Using Movement Range Strategy of the Improved Ant Colony Algorithm for Solving Continuous Problems
Authors: Huang Kang , Wu Zhan Yu , Wu Guan Hong
Published: September 2014

The discrete nature of ant colony algorithm (ACO) and the characteristics of the distributed parallel computation and positive feedback had been made it widely used in discrete space problems, but it limited its application in continuous problems and now studies was relatively few. Articles improved the basic ACO to solve problems in continuous domain. The algorithm improved the way of pheromone to keep, update and advance, and limited it in a Max-Min interval at the same time, avoiding the stagnation and restricted diffusion of the algorithm, enhanced the performance of convergence. Simulation example proves that the improved ACO can quickly find good global solution on the continuum.
Multi-Objective Optimization for the Efficiency and Weight of Helicopter Transmission Planetary Gear Train
Authors: Huang Kang , Zhu Xiao Hui , Chen Xiang , Xia Gong Chuan
Published: September 2014

A multi-objective optimization method for the optimization of the efficiency and weight of helicopter transmission planetary gear train was established. Taking the transmission ratio, efficiency weight, and reliability as critical design parameters, taking the conditions of the planetary gear train itself and the strength check constraint for the gear train as constraint functions, making the weight and efficiency of the planetary gear train asoptimization targets and using the Matlab function fgoalattain, a multi-objective optimization has been made. Comparison between the initial and the optimized results showed the success of the optimized planetary gear train in reducing the weight and increasing the efficiency.
A Study on Leagile Supply Chain Model and Performance Evaluation System Based on Lean Agile Theory
Authors: Jia Hui Min , Yu Kai Chao , Zhang Jin Chang
Published: September 2014

Leagile supply chain integrates lean supply chain and agile supply chain. In this paper, the theory of lean production and agile manufacturing are compared and analyzed, and then the leagile supply chain model and the performance evaluation system based on DEA are established. Based on the above, this paper provides an example of the evaluation system to verify the operability and effectiveness, which can provide the reference for enterprises to improve operating mode of the supply chain or develop a new leagile supply chain.
Analysis for Assembly Dimension Chain of RV Reducer
Authors: Xu Hong Hai , Liu Xue Ao
Published: September 2014

According to the statically indeterminate structure feature of RV reducer, the assembly relation between the parts such as support flange, crankshaft, cycloid gear, pin wheel, pin gear, sun gear and planet gear was analysed in order to meet the assembly condition and the meshing clearance, the assembly dimension chain of RV reducer was established. The conditions which should be met about upper deviation, lower deviation and tolerance of the close-chain and compositive rings among the assembly dimension chain was put forward based on extreme value method, it is very important for the product design, manufacture and assembly of RV reducer.
Evaluation Model for Heavy Machine Tool Remanufacturing Scheme Based on ANP
Authors: Lu Chao , Pan Shang Feng , Peng Yi Bo
Published: September 2014

Green manufacturing is a comprehensive consideration of environmental impact and resource efficiency of modern manufacturing mode. Remanufacturing is a typical application of green manufacturing. This paper establishes an evaluation indicator system for heavy machine tool remanufacturing scheme which contains 5 first-grade indicators and 13 second-grade indicators, and evaluation model for heavy machine tool remanufacturing scheme based on Analytic Network Process (ANP). Taking heavy machine tool remanufacturing scheme optimization for example, the weight and ranking results for heavy machine tool remanufacturing scheme can be obtained through the super matrix. Then it analyzes the impact of node sensitivity on the evaluation of machine tool remanufacturing scheme.
Optimization Design and Modal Analysis of Satellite SAR Deployable Support Structure
Authors: Wang Yan , Liu Rong Qiang , Yang Hui , Wang Bin
Published: September 2014

The design flow of deployable support structures is proposed based on modal analysis, and the finite element model for DST of satellite SAR is researched. On these bases, the affecting factors of DST attitude fundamental frequency (f1) and mass, such as geometry parameters, the lock position, stiffness of hinges and thickness of truss links, are analyzed and optimized. Lastly, considering of space thermal environment the optimal design of the DST is meted the requirements under different thermal fields. The research results are of great importance to improve the performances of DST.
Manufacture of Flexible Automatic Assembly Platform for Aircraft Component Level
Authors: Zhang Hui , Guo Hong Jie , Zhang Shu Sheng
Published: September 2014

This paper describes the composition and working principle of aircraft parts flexible automatic assembly platform, and gives the detailed analysis and design of flexible automatic assembly platform of mechanical structure and motion adjusting control system. The two types of multi plane assembly shows that automatic assembly platform automatic adjusting is reliable, operation control system and motion mechanism runs stable, this system can meet the various needs of automatic assembly platform of aircraft components, and it realizes the work mode of assembly and products in one to many during the aircraft components Assembly process.
Research on Modeling High-Mix and Variable-Batch Flow Manufacturing System
Authors: Li Pei , Chen Ya Rong , Yang Zuo Ya
Published: September 2014

For the problem of modeling high-mix and variable-batch flow manufacturing system, the thesis focus on method of mixed processing task and mechanism of constructing manufacture unit. First, decompose the processing task into Manufacturing Task Tree (MTT for short) according to the level of ‘orders-products-components-fittings-parts’. Then decompose each level node of the MTT to task cell. Then on the basis of processing task, we construct the framework of processing tasks management for group mixed flow manufacturing and analyze the mechanisms of building manufacturing unit for high-mix and variable-batch flow manufacturing system. Finally, we established the model of high-mix and variable-batch flow manufacturing system.
Single-Machine Batch Delivery Scheduling and Common due Date Assignment with Identical Processing Times
Authors: Xie Xing Zi , Wang Xiu Li
Published: September 2014

This paper considers the problem of single-machine batch delivery scheduling with an assignable common due date where all jobs have identical processing times. Finished jobs are delivered in batches and the cost per batch delivery is fixed and independent of the number of jobs in the batch. For our problem, the penalties of earliness-tardiness are assumed to be arbitrarily weighted but the holding costs are equally weighted. The objective is to determine the common due date and find an optimal schedule to minimize the sum of total weighted earliness, tardiness, holding, due date, and delivery costs. We present some basic properties of the structure of the optimal schedule for the problem, and provide a polynomial dynamic programming algorithm.
Application of AMGA in the Mixed Model Two-Sided Assembly Line Type I Balancing Problem
Authors: Jie Zheng Mei , Hou Kai Hu , Zheng Yu Jie
Published: September 2014

This paper searches mixed model two-sided assembly line type I balancing problem based on Y automobile manufacturing company. According to the characteristics and balance constraints of mixed model two-sided assembly line, the actual problem is abstracted as the mathematical model. The three minimal objectives are the station number, the balance index and the wait time. In this study, an advanced multi-objective genetic algorithm is proposed for analyzing and solving the satisfactory solution set of multi-objective optimization problem and example application shows its validity.
The Quality Data Model of Product Lifecycle and Base Application in Electronic Components Industry
Authors: Hu Yao Guang , Wu Dong Feng , Wen Jing Qian
Published: September 2014

On the basis of the electronic components business processes and the analysis of the quality data related, a model based on the object entity of the product life cycle is proposed. Object entity as the carrier of the related data this model mergers and reorganizes the related business, meanwhile links the entity through the revolved information of the quality data model thus achieving the integrity of the business in both time and space. This data model as the basis, can effectively realize the integration and sharing of quality data, facilitates the quality data analysis and quality traceability, and improve the capabilities of quality data management for the enterprise.
The Research of External Factors in Product Image Design
Authors: Yang Lei
Published: September 2014

The external factors that affect the product image design is discussed. Based on Cultural values, external factors such as social culture, national culture, enterprise culture, progress of science and technology are analyzed. The excellent product design is the harmonious and unified performance of the internal and external factors that achieve its ultimate harmony in the Vision, experience, mind of human, it provide consumers with an overall impression. The excellent product design can form a complete and unified image of the product. The above is the product image design for the designers.
Research on Method about Determination of Condition-Based Maintenance Objects by Quantitative Analysis
Authors: Zan Xiang , Zhang Shi Xin , Zheng Yi , Liu Yan Chao
Published: September 2014

As an essential role in determination of condition-based maintenance (CBM) objects ,necessity and applicability analysis are both important. Necessity analysis is first and applicability analysis is second is proposed. Due to shortcoming of traditional methods, a quantitative is proposed. The key of method are criticality evaluation based on Monte Carlo simulation and applicability analysis based on regression analysis, which can solve the problem short of unite standard and influence by subjective factors. The result shows the model works well.
The Effect of the Income Level and Purchasing Method on the Purchase of High-Efficiency Appliances
Authors: Won An Na , Hong Won Hwa
Published: September 2014

With This study investigated and analyzed the income levels and purchasing methods of home appliance buyers in order to obtain implications for the distribution of high-efficiency appliances. A questionnaire survey was conducted for 2,250 households in Korea. As a result, there was no difference in online and offline purchasing ratio by income. However, when the purchasing patterns of all consumers were examined, the online purchase rate had increased more than the offline one. It was shown that consumers had high reliability on online purchase. Moreover, according to online purchasing patterns (internet shopping and others), the online purchase rate of high-efficiency appliances was relatively higher than the offline one.
Distant Learning Course “Energy Efficient Refurbishment Management”
Authors: Vatin Nikolay , Nemova Darya , Khazieva Lina , Chernik Daria
Published: September 2014

Currently, a problem of the deterioration of housing stock exists and more and more buildings require reconstruction and renovation. Therefore, there is the need for specialists of the international level in the reconstruction and renovation of residential buildings in the labor market. To meet the need the distant learning course “Energy efficient refurbishment management” is offered. Implementation of the project is carried out by international organizations from different countries. The course is aimed at improving energy efficiency in new buildings and old residential buildings under the renovation in Russia, Belarus and Ukraine. The main objective of the project is the development of a program that will allow a manager to plan and implement energy efficiency measures of reconstruction. It is assumed that this course will be used both for self-education and for professional development and will be available for people who do not have special knowledge in this area. The program will provide the society with experts in the field of energy efficient renovation.
Information-Technology-Enabled Teaching Paradigm Reform Based on Massive Open Online Courses and Flipped Classroom
Authors: Shen Bin , Li Shu Qin , Jiang Yuan Yuan
Published: September 2014

In this paper, we propose a novel teaching paradigm called "MOOCs + flipped classroom" and discuss the adoption of information technology to support this teaching paradigm. The core ideas, the technical framework, the key supporting technologies and the advantages of this paradigm are introduced. The practice shows the validity of this emerging teaching paradigm.
Academy of Construction for University Applicants as a Tool of University Online Marketing
Authors: Usanova Kseniia , Rechinsky Alexander , Vatin Nikolai
Published: September 2014

The article is devoted to Academy of Construction for University Applicants distance course. The course is posted on university Distance Learning Portal (http://dl.spbstu.ru) based on Moodle. The course is a tool of university online marketing. The main benefits for students trained in this course are analyzed.
The Numerical Simulation and Optimization of Feeding Velocity in Rubber Roller Husker Vibrating Feeder
Authors: Ruan Jing Lan , Jia Le Le
Published: September 2014

Establish the mathematical model of feeding velocity in Rubber Roller Husker vibrating feeder through analyzing the material movement, and determine the relational expression according to the theory analysis of material movement in the feeder. Analyzing the influence of groove obliquity angle , vibrating direction angle, frequencyand amplitude, which are simulated numerically by using the MATLAB software, and optimizing the material theoretical speed are the main objective. The optimal parameters of transmission and the experimental verification can provide more reference for the design of the Rubber Roller Husker vibrating feeding system.
The Research and Analysis on Lockpin Synchronizer
Authors: Li Hai Ning , Wang Kuan
Published: September 2014

To improve the heavy-duty vehicles’ gear shock solution during shifting and improve shifting comfortable, a research direction is improve the performance of lockpin synchronizer. Through the analysis of the main technical parameters of lockpin synchronizer, got the main research direction to improve the performance of lockpin synchronizer. The synchronizer structure optimization design was discussed. And the synchronizer is simulated and analyzed using the virtual prototype technology, which give a way to improve the performance of synchronizer.
Application of Near-Field Acoustic Holography to Identify the Mechanical Noise Sources on the Submarine
Authors: Wan Hai Bo , Zhu Shi Jian , He Qi Wei
Published: September 2014

In order to localize and identify the mechanical noise sources on the submarine, a kind of double-layer submarine model with ring-stiffened was established, and the broadband actuators were put on the inner structure to simulate the mechanical equipment. The radiated acoustic field of the submarine model was reconstructed by the near-field acoustic holography method, which was also compared with the theoretical acoustic field. The simulation results showed that the reconstruction pressure amplitude agreed well with the theoretical calculation results, indicating that the acoustic field of submarine model could be reconstructed accurately by the method of near-field acoustic holography, and the mechanical noise sources would be localized and identified accordingly.
Test and Analysis about Elastic Properties of Commercial Vehicle Cab Air Spring
Authors: Li Li Ping , Wang Li
Published: September 2014

The tests about elastic properties of a commercial vehicle cab suspension air spring were carried out. And the experimental results show that: the higher the initial pressure of the air bag, the greater its carrying capacity, and the bigger the damping; at the same excitation frequency and the vibration amplitude, the dynamic stiffness of the air spring is gradually increased as the initial pressure is increased; in the low frequency range, at the same vibration amplitude and inside pressure, the dynamic stiffness of the air spring is increased as the increasing of the excitation frequency.
Analysis on the Side Leakage Amount of the Friction between Piston and Cylinder Block in Axial Piston Pump
Authors: Wang Wei
Published: September 2014

The spherical distribution pairs of the plunger and the cylinder friction, has an important influence on the performance of spherical port plate axial piston pump. Based on the analysis of fluid viscosity change with pressure and temperature, considering friction differential pressure flow and shear flow, establishes the mathematics model of the friction pair of leakage. The simulation analysis using MATLAB software, the leakage flow rate is not proportional to pressure, but with the increase of pressure leakage flow was increased, and with the increase of pressure viscosity coefficient and temperature coefficient of viscosity, the leakage flow rate correction coefficient increases obviously, so in the choice of the hydraulic oil cylinder hole, should choose a relatively moving average leakage rate had no effect the piston ring slot.
Theoretical Analysis of CO2 Bubble Formation in Anode Flow Field of μDMFC
Authors: Li Miao Miao , Geng Jun , Zhu Ru Peng
Published: September 2014

A mathematical model was established and validated to predict the microbubble diameter when it departing from the carbon paper and moving into the channel of μDMFC. Single bubble behaviors were studied using the model, which took the gas velocity, liquid cross-flow velocity, micro porous diameter and other parameters into account. Results indicate that the microbubble departure diameter decreases with the increasing liquid velocity, and increases with the increasing micro porous diameter and increasing gas velocity.
Microturbines Degree of Reactivity
Authors: Fershalov Mikhail Yu. , Fershalov Yuriy Ya. , Fershalov Andrey Yu. , Sazonov Timofey V. , Ibragimov Damir I.
Published: September 2014

This paper presents the a mathematical regression model for the reactivity degree of microturbine stages depending on the constructed and model factors that have the greatest impact on the function value.
Folding and Deployment of a New Thin-Walled Tube Flexible Hinge
Authors: Yang Hui , Liu Rong Qiang , Guo Hong Wei , Tao Jian Guo
Published: September 2014

A new thin-walled tube flexible hinge with six slots is proposed. The slot geometry is parameterized in terms of slot width, length and distance between two adjacent slots. The experiment for tension test of the thin-walled tube hinge with six-slots is conducted by INSTRON and the tensile stress-strain curve is measured. Finite element analysis to investigate the quasi-static folding and deployment of the new hinges by ABAQUS/Explicit solver are employed to perform a series of parameter studies for the slots longitude lengthl0, the slot widthwand the distancedbetween two adjacent slots.
Using Adams/Car and Insight in Simulation and Optimization on Guiding Mechanism of Air Front-Suspension
Authors: Li Meng
Published: September 2014

A mode of air front-suspension is established, and the effect of alignment parameters with the bump of the wheels is analyzed. The Guiding Mechanism of Air Front- suspension is optimized by using Insight, The optimum model parameters is obtained. It is concluded by comparing the wheel alignment parameter before and after optimization that After optimization guide mechanism makes the vehicle has better steady state characteristics.
Road Bank Angle Estimation for Land Vehicle
Authors: Shen Yong , Song Zhen Teng , Wang Qiong
Published: September 2014

This paper presents a method for estimating road bank angle for land vehicle. When the vehicle is traveling on a lateral slope road, due to the effect of suspension, roll will be occur. While the ordinary method for the roll angle measurement is by gyro which is mounted on a vehicle body, the measured value of the roll angle includes not only the suspension’s deformation but also includes road bank angle. In order to obtain independent parameters, other methods must be used. First , we get the corresponding roll parameters of vehicle suspension through PSO by taking rotation test in the plane. Combined with parameters we get through inertial measurement module, a method is proposed to estimate the road bank angle. Finally, effectiveness of the method is verified through experiments.
Analysis of Pulverized Coal Combustion in Precalciner Based on Fluent Software
Authors: Dong Li Long , Zhao Wei Lin , Xing Ning Ning
Published: September 2014

The pulverized coal combustion in precalciner in the cement plant with capacity of 5000t/d was investigated by numerical calculation using Fluent software. The standard k-ε model and particle stochastic trajectory model was proposed to simulate the three-dimension turbulence flow and pulverized coal movement respectively. The energy equation including P1 raditional model and non-premixed combustion model were applied to calculate the internal flow field of temperature and concentrations of volatile, CO, O2 and CO2. It indicates that the structure of precalciner is well designed and the pulverized coal can burn quickly after injecting from burners. The decomposition temperature that production needed is satisfied and the concentrations after combustion are accepted.
Reliability Analysis about A/C-Axis of Woodworking Five-Axis Milling Head
Authors: Wang Shuang Yong , Zhang Wei , Zhang Qian Wei , Yang Jian Hua , Zhang Peng Fei
Published: September 2014

As a core feature of high-end CNC machine tools, the torque carrying performance of five-axis milling head directly affects the machining accuracy and reliability. Through theoretical analysis and derivation, combining experimental prototype, the A/C-axis cutting torque formula of five-axis milling head on woodworking is obtained. The reliability analysis provides a theoretical basis for drive motor selection and five-axis milling head structural optimization and improvement.
Risk Assessment of City Pipe Network Based on Matter-Element and Extension Model
Authors: Zhou Yong , Wang San Ming
Published: September 2014

Obtain the weight of risk factors at all levels based on AHP analysis model,optimize the third edition of Pipeline Risk Management Manual to establish a new index system.Bring in the matter-element and extension model,according to the established index system and expert scoring results , calculate the correlation function values of each risk characteristics to each of the risk levels,using the figures to reach the risk level of the city pipeline.Through living example shows that this evaluation method is correct.Compared with the general evaluation method,the matter-element and extension analysis model overall consider the weight of the risk factors,expert score and the grade index system.This evaluation method is more accurate compared with the general evaluation.
Study of Computation for Structural Reliability Index Based on Penalty Function Method
Authors: Lu Hai Tao , Dong Yu Ge , Wu Fang Ying
Published: September 2014

According to the geometric meaning of the structural reliability index, an unconstrained optimization model with structural reliability index and design point is obtained by exterior penalty function method. The Powell method, golden section method and extrapolation method are used to solve the unconstrained optimization problem. The proposed method not has to deal with the any derivative of the limited state function, and can been used to obtain structural reliability index and design point of the strong nonlinear limit state function, which first-order reliability method (FORM) may fail to converge. Three examples are given to compare penalty function method with the difference methods. The results show that the given method is simply, effective and precise enough.
Pipelines Stability under Extreme Hydrodynamic Conditions
Authors: Muravyeva Liudmila , Vatin Nikolai
Published: September 2014

At the current level of technical development of subsea pipeline systems a probability of their damage during construction and operation due to various causes may not be excluded.In the regions of high seismic activity the soil destruction may occur in the weak layers forming seabed deformations. Hazard management practice has advanced in recent years, due to several factors: global pipeline expansion in areas of difficult terrain (tectonic/seismicity; permafrost area, landslides) coupled with a greater understanding of the prevalence of hazard.Formal risk assessment is relatively immature in most industries, including pipelining. A better solution is to establish guidelines of essential ingredients necessary in any pipeline risk assessment. Critical would be identified and it would be left to the operator subject matter experts to detail those elements.This article focuses on the problem of imposing special (seismic) loads; the subject matter of the article also includes the issues of the marine pipeline safety (risk) evaluation.
Investigation of Approximation Methods for Mechanism Reliability Analysis Considered Nonlinear Response
Authors: Wang Hui
Published: September 2014

The joint clearance and contact phenomena are the key factors which can induce the nonlinear dynamic responses and affect the performance of the practical mechanism. It is difficult to solve the nonlinear relations between the input variables and responses when the random factors are considered. In this paper, three approximation models, i.e., Response Surface Model (RSM), Kriging model and Support Vector Machine (SVM), are selected to investigate the reliability analysis procedure by the combination of simulation technique and approximation model for the mechanism with joint clearance. The solution strategy with supplemental samples is proposed to solve the problem caused by the occurrence of the abnormal point in the iteration procedure, and to avoid the divergence in the reliability analysis caused by the nonlinear dynamic responses of the mechanism. Meanwhile, the computational consumption can be reduced as the results of the known samples are reused. Finally, the reliability analysis for a slider-crank mechanism with joint clearance is utilized to illustrate the proposed procedure.
An Oil and Gas Pipeline Accident Model Based on Failure of Generalized Management
Authors: Jiang Shu , Zhang Li Jing , Tao Gang , Wang Zhong Yu
Published: September 2014

With the arrival of China's oil and gas pipeline network era, the security of oil and gas pipelines confront great challenges. Scientific pipeline safety management methods and concepts are needed. In this paper the SHEM model which is composed of hardware, software, environment and management is put forward to explain the cause of oil and gas pipeline accident. According to the control system of management failure, the oil and gas pipeline accident model based on failure of generalized management is established to provide effective methods for accident prevention and construction of safety management system for oil and gas pipeline.
Flow Analysis on the Effect of Rotational Speed on the Characteristics of 3-Dimentional Screw Propeller of Ship
Authors: Sun Min Young , Moon Byung Young , Lee Gee Nam
Published: September 2014

In this study, the commercial code was used in order to derive the discharge flow rate and the thrust force in accordance with the rotational speed of the 3-dimensional blade of screw propeller. In addition, computational domain was considered in this research and it was realized by the analysis in the blades and the outlet chamber. Furthermore, a total of 2,640,222 mesh was calculated in consideration of unstructured mesh and the analysis was performed according to the total of the rotating speed (3200, 2400, 1600, 800rpm). The analysis was carried out on the pressure distribution, discharge flow rate and consequent thrust force according to the rotational speed. Especially, the analysis was realized focusing on the condition of 3200rpm. The difference between the maximum pressure and the minimum was 5.5MPa in the given condition and the discharge flow rate as to the pressure difference was the level of 1956.67 kg/s, as the thrust force of 47083.7 F(N) was obtained. In addition, it was considered that occurrence of cavitation in the given condition is closely related the decrease of durability of screw propeller in the aspects that the thrust force on driving depends on the speed.
Design and Development of Automated Tire FE Modeling Procedure
Authors: Yang Jin Dian , Zhang Qin He , Ding Dong , Wang Hai Jiao
Published: September 2014

The paper addresses a modelling procedure to automatically generate 2D finite element meshes of tires, together with the assignment of material property. A program is developed based on the secondary development of HyperMesh with TCL/TK language, thus achieving the automatic FE modelling starting from the AutoCAD tire cross-section profile. The model created as input file can be exported into ABAQUS directly. By automatizing the modeling process, the program can significantly reduce the modeling time and improve modeling efficiency.
Simulation of Gear System Based on Dynamic Relaxation
Authors: Zhang Wei , Xing Wu , Xiao Zheng Ming , Liu Xiao Qin
Published: September 2014

Aiming at gear in dynamic analysis simulation system often appears oscillation problem the phase of high-frequency. An method of eliminating the initial loading of oscillation system bases on dynamic relaxation, which is presented. In this paper, preloading dynamic relaxation process was carried out in the gear system. Also, the application method of dynamic relaxation based on LS-DYNA is proposed. and on account of LS-DYNA platform which proposes dynamic relaxation method in the application to dynamic simulation method of gear system. Finally, investigating the efficacy of method by simulation example.
Impact of Grid Type on the Stress-Strain of 175F Diesel Engine Piston Structure Calculated by the Finite Element
Authors: Yuan Wen Hua , Ma Yi , Fu Jun , Tang Yuan , Chen Wei , Zhu Zhi Guo
Published: September 2014

The finite element modeling is based on the aluminum-silicon alloy piston compression performance test by using both 10-node tetrahedron element and 10-node hexahedron element. After analyzing four grid types, we found that employing both tetrahedron element and hexahedron element can obtain stress-strain nephogram, but with a difference between the four modeling results. In the context of having the same grid size, 10-node hexahedron element reflects a fairly accurate piston stress-strain status than the 10-node tetrahedron element, and among the four schemes, the result calculated by analyzing the locally refined grid that containing both 2mm and 1mm sized 10-node hexahedron grids is the one that matches the experimental value best.
Research on Key Technology of CAD for Crystal Lamp with Planar Distribution
Authors: Liang Yan Xia , Dong Guang Guang
Published: September 2014

Crystal lamp has been preferred in indoor lighting design because of its gorgeous effect of light. Crystal lamp has many same or similar elements in the structure, so using CAD technology can help designers to quickly design and model crystal lamp. In this paper, the planar distribution of crystal lamp has been divided into two kinds of situations such as the concentric form crystal distribution and the rectangular form crystal distribution. Aiming at each situation, mathematical analysis has been done and the pseudo-code been given respectively. Then a parameterized modeling plug-in for crystal lamp aided design based Rhinoceros platform has been developed by using VB language. By selecting the parameters and variables, the plug-in can automatically create 3D model of crystal lamp, thus realize the parameterized modeling and improve the efficiency of design.
Research of Ultrasonic Distance Measurement System Based on Pseudo Random Digital Correlation
Authors: Qi Yan Xing
Published: September 2014

An ultrasonic distance measuring system is designed by using MC9S12DG128 microcomputer in this paper. To improve the measuring distance and accuracy, the ultrasonic signal can be modulated with pseudo random binary sequence, and time of flight (TOF) can be determined by calculating the cross-correlation function of the transmission signal and its echo signal. What’s more, the two-step correlation method is adopted in order to reduce the computational complexity. The experiments show that absolute error of the measuring equipment is less than 5 millimeter within the range of 1-5 meter.
Analysis and Optimization of Efficiency Rotor Wheels Microturbines
Authors: Fershalov Andrey Yu. , Fershalov Yuriy Ya. , Fershalov Mikhail Yu. , Sazonov Timofey V. , Ibragimov Damir I.
Published: September 2014

Examined efficiency of axial rotor wheels microturbines. The mathematical models, regression-type, for efficiency rotor wheels and the exit angle of the working body from rotor wheels are presented. The technique of determining the gas-dynamic and structural characteristics of the flow part of the rotor wheels microturbines are also shown.
Structural Design of Large Size Measuring Machine Base on Electro-Optic Automatic Detection
Authors: Li Wei , Huang Feng Xiao , Zhao Hong Liang , Qi Xiao Yan
Published: September 2014

As a result of the large-scale components' measuring environment complex, the workers measuring operation not reliably and so on factor influences, uses the non-contact electro-optic measuring technique is the main development direction of the large size components measuring. In this paper, iron tower component is taken as measuring object, online automatic detection is aimed to achieve, and the system frame is constructed to carry out electro-optic automatic detection of the iron tower component, then designing of large size examination machine will be accomplished.
The Review of Track Inspection Technology and Application Prospect on Subway
Authors: Cao Zhen Feng , Chen Wen Jie , Chong Lei , Lu Xin Yuan , Yang Ming Lai
Published: September 2014

The paper introduces the technical features of the railway track inspection cars of different countries and the development review of China’s technology of railway track inspection, and make a brief comparison of the advantage and disadvantage between the chord measurement and Inertial method. The paper also introduce the integrated detection system, which consists of a laser visual detection system, laser radar scanning technology, infrared thermal imaging technology , radar technology and communication detection system. With the implementation of the railway transport, enhanced efforts should be exerted to the comprehensive checking of the track. The development orientation and application of subway inspection equipment is put forward. To develop new portable track inspection cars which can detect the railway tracks and tunnels and the quality of the transmission channel of the train control information, the strength of wireless mobile communication system and track’s electromagnetic environment at the same time.
Calibration of Thermostatic Bath Used on Electronic Thermometer Verification
Authors: Zeng Qin Qing , Chen Le , Xie Min , Fu Ya Qiong , Zhou Zhen
Published: September 2014

In order to research the uniformity and volatility of thermostatic bath used on electronic thermometer verification, a method based on thermostat technical performance specifications is presented. Including the introduction of calibration device, the choice of standard device and experiment method. In the end the uncertainty analysis on the measurement of thermostatic bath uniformity and volatility is made. Experiment results show that the uniformity and volatility of this thermostatic bath are 0.0091°C and 0.0087°C/10min with the measurement uncertainty of 0.018°C, The results meet the requirements of electronic thermometer verification. It provides guarantee for the next electronic thermometer verification.
Monitoring Growth Characters and Yield with Hyperspectral Remote Sensing in Wheat
Authors: Jiang Xiao Dong , Shi Jiao Jiao , Xu Jia Ping , Wang Xiao Mei
Published: September 2014

This research aimed at studying the quantitative relationship between chlorophyll content, LAI, yield and spectral parameters of two species of winter wheat (Yangmai 13 and Xumai 31) with Free Air Temperature Increased facility. Four warming scenarios were designed in the experiment: all-day warming (AW, warming of 1.9°C, daytime warming (DW,6:00am-18:00pm,warming of 2.1°C), nighttime warming (NW,18:00 pm-6:00 am next day, warming of 1.7°C) and the control (CK, without warming). The results showed that reflectance of the four treatments at near infrared flat (nm-nm) had significant differences in booting stage and the sequence was: DW>AW>CK>NW. At visible band, the reflectance under NW treatment was much lower than that under other treatments. PND920 and P_Area920 were correlated with chlorophyll with high coefficient of determination. RVI and NDVI which constituted by the 810nm and 560nm reflectance were highly correlated with LAI. Booting stage was the optimum period for yield estimation. P_Depth560, NDVI (560,450) and RVI (560,450) were significantly related to yield and thus they could be utilized for yield prediction.
Assembly Quality Detection Software for Combine Harvester Based on Vibration Spectra Analysis
Authors: Zhang Ya Wei , Chen Du , Wang Shu Mao , Lu Bo
Published: September 2014

To detect the assembly quality of combine harvester, vibration spectra analysis method based software was proposed using the advanced graphical language LabWindows/CVI. Each spectrum band of different features was acquired by extracting special features of the vibration signals from some main rotary tillage parts. Using the six bands analysis method to judge whether the assembling of combine harvester was qualified or not by comparing the features with alarm windows established before. A serial of tests showed the software could correctly calculate the peak value and spectra energy for the divided spectrum. Furthermore, by comparing with the assembly quality feature database, the software could provide diagnose of assembly quality for a combine harvester rapidly.
Multiple Leakage Detection and Localization Method Based on Bayesian Theory and Genetic Algorithm
Authors: Jin Tao , Zhou Ze Yuan
Published: September 2014

To detect and locate the leakage of the pipe correctly, genetic algorithm is combined with Bayesian theory to determine the leaked pipes. Leakage detection and leakage location are carried out separately. Leakage detection is conducted based on the assumption that there is only one leaked pipe, and the simulation result demonstrates its feasibility. When the leakage detection demonstrates there is leaked pipe in the water distribution system, leakage location starts. Based on the information gathered by the manometers, leakage probability in different combinations of the virtual nodal demand can be fixed according to calculating the pressure of the monitored node, then GA is applied to search the maximum Bayesian value, the pipes with maximum Bayesian leakage possibility are believed to be leaked pipes. Optimization programme was made with combination of Matlab and Epanet, numerical simulation results demonstrate the feasibility and effectiveness of the proposed method.
Novel Low-Frequency Rectangular-Loop Piezoelectric Energy Harvester
Authors: Yuan Shuai , Jiang Bing , Chen Li Juan , Hao Yu Guo , Xin Jian Bo , Zhang Hua Qing
Published: September 2014

The ambient energy harvesting based on piezoelectric has become an important subject in recent research publications. A new rectangular-loop piezoelectric energy harvester(RLPEH) is proposed. The characteristic is analyzed by the finite element analysis (FEA) which includes the static analysis, modal analysis and harmonic response analysis. The analysis results show that the RLPEH could reduce the resonant frequency and improve the output voltage. The three order resonant frequency is 18.6Hz, 40.8Hz and 85.4Hz. The output voltage is 42V under 3m/s2 of acceleration and the effective bandwidth is 18.7Hz with output voltage above 10V.
Research on Solar Panels Online Defect Detecting Method
Authors: Wang Ya Li , Sun Jian , Xu Hong Wei
Published: September 2014

Taking solar photovoltaic panels as the research object, infrared diagnosis technology is used to inspect the quality of crystalline silicon solar panels, and using infrared detecting principle of infrared thermal imager to design a set of device, which can detect the internal and surface defects of the solar panels. Common defects such as black piece, broken gate, crack and fragment can be detected and classified according to the infrared image characteristics of the four kinds of defects, also it can quickly locate the defects. Experiments show that, after image processing of the images captured by the infrared imager, it can be easily and visually to determine whether a photovoltaic panels is flawed. Last but not least, to classify the defects.
The Design of Eddy Current Sensor Based on ANSYS and the Research on Weld Flaw Recognition Method
Authors: Na Wen Bo , Jiang Qing Feng , Xie Long , Zhou Wen Bo
Published: September 2014

Eddy current sensor with online non-contact measurement, no coupling medium and high sensitivity etc, is widely used in engineering. In this paper, based on the eddy current testing principle, the eddy current sensor is modeled in ANSYS software to complete the optimization design. The article research on the method of flaw recognition after extracting the detection signal features and analysis the impact of the flaw size on the detection signal, so as to provide a theoretical method of qualitative detection in the practical application.
Distance Measurement Algorithm Based on Binocular Stereo Vision
Authors: Long Hui Min , Guo Hai Yan , Liang Feng , Liu Gui Hua
Published: September 2014

Distance measurement technology of binocular stereo vision has the advantages of wide-range detection, simplicity and reliability. The method is widely applied to robot obstacle avoidance and path planning. Binocular stereo vision can only measure the distance of images feature points generally. However, more information about distance of non-feature points is also needed to acquire in practical applications. This paper proposes a stereo distance measurement method, which can measure distance of points whether it is a feature point or not based on a dense matching method. A dense parallax map is obtained by the graph-cuts algorithm. On the basis of the calibration parameters of binocular camera and the left and right image dense parallax map, the three-dimensional coordinates of the any points and their distance will be gotten. The true image experiment has proved the feasibility of this algorithm with high accuracy and maneuverability.
Object Classification via PCANet and Color Constancy Model
Authors: Hu De Kun , Zhang Li , Zhao Wei Dong , Yan Tao
Published: September 2014

In order to classify the objects in nature images, a model with color constancy and principle component analysis network (PCANet) is proposed. The new color constancy model imitates the functional properties of the HVS from the retina to the double-opponent cells in V1. PCANet can be designed and learned extremely, which comprises only the very basic data processing components: cascaded principal component analysis (PCA), binary hashing, and block-wise histograms. At last, a SVM is trained to classify the object in the image. The results of experiments demonstrate the potential of the model for object classification in wild color images.
Experimental Study on Bearing Capacity of Q690 High-Strength Steel Tubes under Axial Load
Authors: Peng Yi Liang , Li Guo Tian , Han Xuan Min , Chen Lei
Published: September 2014

With the rapid development of power transmission and transformation projects in China, steel supporting structure has already became the most popular structural form for these structures. However, the limit of steel grade used for current substation supporting structures is normally Q420, compared with that of Q690 used in other countries. When the high-strength steel is used, the geometric parameters of section for members become smaller, and the stability of members is the most important factors to influence the bearing capacity of structures. The stability factor for axial loaded steel members in current 《Code for design of steel structures》(GB50017-2003) was derived based on the experimental results for steel members with lower steel grade, the results are inevitably different from those for high-strength steel members. To make the calculations of Q690 high-strength steel tubes more accurate and reasonable, this paper conducts experimental study on the bearing capacity of Q690 high-strength steel tubes under axial load to provide scientific basis for practical design of these structures.
Structural Optimization Design of Steel Tubular Arched Bridge Based on APDL
Authors: Ma Yong Bin , Wang Jing Yu , Gu Bing Dong
Published: September 2014

In order to optimize the structure of steel tube arched bridge, the parameterized model of steel tube arched bridge shall be established on the basis of APDL of ANSYS finite element. based on the huge computational power of ANSYS and the flexibility of APDL parameterization language, choose width of longitudinal beam, radius of arch ring and radius of suspender as design variables, regard maximum deflection and maximum stress as state variables, and take total volume as objective function. Realize structure optimization analysis of steel tubular arched bridge via parameterization computation.