bluuebunny/crossref_metadata_2025 huggingface dataset:
The Analysis of Channel Stress Induced by CESL in N-MOSFET
Authors: Twu M.J. , Kao W.C. , Lin K.C. , Chen K.D. , Kua Y.T. , Liu C.H.
Published: December 2013

The strained nitride capping layer (contact etch stop layer, CESL) is used as a stress booster that make transistor improvement. In this research, the n-MOSFET was simulated combining CESL tensile stressor. The stress in channel region for various part of CESL(CESL-top, CESL-lateral, CESL-bottom) were analysed and compared. The result of simulation explains how the CESL transmits the intrinsic stress to the channel. The relations between different CESL structures are discussed in this study.
The Facet Passivation Characteristic of 940nm Semiconductor Laser
Authors: Li Zai Jin , Zheng Xiao Gang , Li Te , Qu Yi , Bo Bao Xue , Liu Guo Jun , Ma Xiao Hui , Wang Min
Published: December 2013

A novel facet coating technology is presented by studying catastrophic optical mirror damage mechanism of semiconductor laser. In this technology, semiconductor laser are cleaved in the air, and the surface oxide layer is removed with a low energy ion source, immediately flowed by coating the facet with 20nm of thin ZnSe passivation layer. The function of the passivation layer is to protect semiconductor laser facet, and prevent impurity particles diffusing to the facet. Finally the facet is coated with oxidative optical film. The test results of semiconductor laser output power show that output power with the coated ZnSe passivation layer method is 12% higher than coated Si passivation layer, and 36% higher than that coated oxidative optical film. The device coated oxidative optical film is failed when current is 4.1A, and the device coated with Si passivation layer is failed when current is 4.8A, the final failed of the device is coated ZnSe passivation layer. In conclusion, the method of coated ZnSe passivation layer on the semiconductor laser facet can effectively prevent the catastrophic optical mirror damage, and increase the output power of semiconductor lasers.
Effect of Post Annealing Temperature on Cerium Doped ZnO Nanostructures
Authors: Kasar Chetan K. , Sonawane Ulhas S. , Patil D.S.
Published: December 2013

In this paper, the effect of post annealing temperature for 5% Cerium doped ZnO thin films have been investigated. Films have been deposited on to the glass substrate using spin coating method. The structural and optical properties of the films were characterized using X-ray diffractometer and UV-spectrophotometer. Transmission of the films was found to be increase with increasing post annealing temperature. Average transmission of all the films was found to be more than 90%. Optical band gap show a minor variation with post annealing temperature. Nanostructures of cerium doped ZnO have been confirmed through AFM.
Stress Distribution Form and Function Representation of Four Free Edges Square Basal Bottom Slab Touching Foundation
Authors: Li Ai Min , Cheng Hua Hu , Huang Mo Jia
Published: December 2013

This article constructed the stress distributions function expression of four free edges square basal bottom slab touching foundation respectively from the two aspects of symmetric and anti-symmetric load, placed the foundation on the surface of the sandy soil, do numerical simulation to the contact stress between foundation slab and foundation through the large scale finite element analysis software ANSYS, and fitting by adopting the contact stress function proposed in this article. The contact stress function and finite element numerical fitting result shows that the contact stress function proposed in this article can better reflect the actual contact stress distribution, also adapt to foundation slab with different width height ratio.
The Research on Vibration Testing and Analysis Method of the Steel Truss Coal Trestle
Authors: Wei Chang Fan , Hu Shao Yi , Zhao Bao Sheng
Published: December 2013

The coal transport trestle as a connection channel is widely used in large and medium-sized coal enterprises, which plays an important role in the whole manufacturing process. The vibration problems in coal transport trestle can not only reduce the occupant comfort, cause people serious harm, but also have pernicious effect on structure. Along with the structure aging and dynamics property change, things go badly, which even causes enormous life and property loss. This paper describes the vibration testing and analysis methods of the steel truss coal trestle though engineering examples. The results show that the belt transport system is the main reason which caused the vibration of the STCT, and trestle must undergo resonance phase with the exciting force changes.
Analysis of Cantilevered Laminate with Piezoelectric Ceramics PZT5A Based on ANSYS
Authors: Jia Hong Yu , Wang Xiao Fei
Published: December 2013

The finite element model of piezoelectric cantilever laminate is established with ANSYS and the vibration character of the model is carried out. The vibration characters of different size of piezoelectric laminate and different voltage is compared. The maximum displacement demonstrates the trend of decreasing step by step with increasing the thickness of the base steel layer. The displacements of the same base steel layer and piezoelectric layer are increasing with the incremental voltage.
Feature Extraction of Diesel Engine Wear Fault Based on Local Tangent Space Alignment
Authors: Xiao Hai Bing , Xie Xiao Peng , Zhou Shou Qin , Xie Heng Xing
Published: December 2013

In view of diesel engine wear fault feature extraction, feature extraction of diesel engine wear fault based on Local Tangent Space Alignment (LTSA) was put forward. This paper analyzes LTSA algorithm which reveals the characteristics of manifold learning. Take diesel engine fault diagnosis test rig as example, vibration information was got through imitating different kinds of diesel engine wear fault. LTSA algorithm was applied for dimensionality reduction. LTSA algorithm’s classification performance was compared in accordance with recognition rate of multi-class SVM. The experimental results show that LTSA has high recognition rate and is a very effective feature extraction method for diesel engine wear fault.
Low Frequency Micro-Vibration Active Isolation Control System Design and Experimental Research
Authors: Li Shu Qing , Wang Liang Liang , Tao Zhi Fei
Published: December 2013

Whether in the aerospace, or seismic exploration, as well as high precision operation of all trades and professions, low-frequency interference directly influences the instrument monitoring and detection precision, resulting in insufficient accuracy of the implementing agencies. The passive vibration isolation method was used by most high accuracy equipment at present, the efficiency of isolation can only achieve 60%-70%, that will have influence to the extremely precision equipment certainly. In this paper an active vibration control system was realized by using single-chip microcomputer and the PID control algorithm. System simulation model was built and experimental tests had been conducted. The interference eliminated more than 80% for 3Hz and below,can effectively improve the precision equipment to work under the low frequency interference.The system provided an effective method to suppress the low frequency interference.
Study on the Deformation Mechanism of Floor Slab with Hole under Horizontal Earthquake
Authors: Suo Si , Zhang Shuo Ying
Published: December 2013

Using three slab models (elastic plate, elastic membrane and rigid plate), the column displacement of one storey frames with different slab-hole ratio, column size and slab thickness under horizontal earthquake were calculated to investigate the driving and limiting factor on the in-plane deformation of floor slab. An influence factor concerning structure stiffness, floor slab stiffness and representative value of gravity load was proposed on the concept of fixed zone and deformed zone. A linear relationship between in-plane deformation and the influence factor was obtained based on the statistic data of 18 examples. Results show that the effect of out-of-plane stiffness of floor slab is very small and negligible and the in-plane deformation of floor slab can be kept within a reasonable range by balancing the structure stiffness of slab strips around the hole and deducing the length-width ratio of floor slab located at deformed zone.
Research on Monitoring the Bridge Deformation by Using GPS Technology
Authors: Yu Cheng Xin , Zhang Jia Dong , Xu Wei Min , Chen Ming Zhi
Published: December 2013

The harm of bridge deformation is serious, real time monitoring of bridge deformation is important to ensure the safe use. Over the years, the routine measuring method is unable to complete the multiple, dynamic monitoring. This paper discusses the method of multi-points instantaneous monitoring by using GPS technology, makes a great contribution to improve the technology of bridge detection, and has achieved good results.
Mitigation Measures Research of Vortex-Induced Vibration of the Forth Nanjing Yangzi River Bridge
Authors: Ding Jing , Liao Hai Li
Published: December 2013

The wind tunnel testing of large scale section model of the Forth Nanjing Yangzi River Bridge was conducted by the section model with a scale of 1:20. The details of the bridge girder could be simulated more precisely with a large scale. In the testing, a comparison was between the original girder cross section and the girder section without rails and tracks in the attack angle of +5°. On top of this, the main factor that causes the vortex-induced vibration of the girder was due to the installation of guide rail in the bottom of the girder. The control of vortex-induced vibration research was conducted concerning the installation of the guide rail.
Study on Effect of Seismic Joint to Seismic Response of Tunnel Passing through Fault
Authors: Gao Feng , Shu Xiao Gang , Xue Dian Li , Liu Jiao
Published: December 2013

As underground structure, the tunnel itself has good anti-seismic performance, but in recent years, according to a large number of investigation data about the earthquake disaster for tunnel, we find that the tunnel passing through the fault fracture zone is quite easy to be destroyed seriously. Therefore, developing dynamic response analysis and shock absorption measures has great practical significance. According to the characteristics of tunnel passing through fault and the tunnel depth, considering a certain proportion relationship in finite element model, the analysis model for tunnel seismic joint is established. Finally comparing the results comprehensively, we discuss the effect of the different setting location and setting separation distance of seismic joint to seismic response of tunnel passing through fault. From the work we have done, we get the seismic joint which is good for tunnel seismic resistance. This method is expected to be adopted as reference to the similar projects.
Influence Evaluation of Fastener Stiffness Match on Subway Rail Switch Safety
Authors: Ma Ming Zheng , Wang Ping , Xu Jing Mang
Published: December 2013

To study the influence law of fastener stiffness match on subway rail switch safety, and select appropriate stiffness, the No.9 subway switch was taken as an example in this paper to carry out all the following work. Based on finite element method, the influence of fastener stiffness match on the vertical dynamic relative displacement of switch rail and dynamic gauge widening were analyzed. The result shows that: the design concept of 'soft upper and rigid lower' can effectively decrease the vertical relative displacement of switch rail, and avoid the load of switch rail in advance, and ensure the safety of structure strength; It also could slow down dynamic gauge widening and serpentine movement amplitude, and improve the safety and stability of train; To ensure the safety of train, the design conception of soft upper and rigid lower should be applied for the subway switch.
Analysis of Separated Bridge for Lateral Connection
Authors: Yu Hua Qiang , Lin Ming Qiang
Published: December 2013

Use of cantilever plate and the fixed plate’s end moment formulas can obtain the value of the plate end moment which is increased, and then you can determine the reinforcement.Considered the differential settlement,an existing project is well solved, use the simple analysis to quickly identify the projects’ suitable means of connection.
Nano Materials and its Application in Space
Authors: Wu Chun , Ma Wen Xin , Chen Ya Ping , Li Ying , Chen Yan , Li Jing
Published: December 2013

Nano material is a new type of multi-functional materials, this article simply introduces the development present situation, performance and preparation method, and application in the aerospace field.
Performance Evaluation of Smart Grid Based on Optimal Fuzzy Algorithm Method
Authors: Wang Qing Ran
Published: December 2013

The global upsurge in research and construction of smart grid is creating new opportunities and challenges. This paper proposes a procedure and method for assessing the operation performance of the smart grid. The hierarchical analysis of factors reflects the operation situation in the overall goals. An incentive regulation model based on the optimal fuzzy algorithm and data envelopment analysis is presented.
Study on the GFRP Tube Columns by Eccentricity and Concrete Strength Affection
Authors: Dong Xu , Zhang Yun Feng , Yu Yang , Zhou Xin Yu , Guan Hai Wei
Published: December 2013

For the study of eccentrically loaded GFRP tube columns filled with reinforced concrete, simulations were made with 21 specimens to study their load-displacement curves, treat concrete strength and eccentric load as main parameters.
A Simulated Study on the Combustion and Emission Performances of Diesel Engines
Authors: Wang Jing , Wang Qian , He Min , Jun Shen
Published: December 2013

Based on the KIVA-3V source program and coupling the multidimensional model of in-cylinder combustion, this thesis designs a simulation platform of the combustion and emission performances of diesel engines. Results of the test on the in-cylinder pressure change and emission of the experimental subject proves the accuracy of the platform, showing that the platform is able to objectively reflect the real working process of the subject, and that it can be used to research the combustion and emission performances of the experimental engines for a further improvement of the working performances.
The Research on Bearing Carrying Capacity of Aging Reinforced Concrete Beam Strengthened with CFRP
Authors: Jia Bin , Li Dan , Liu Xiao , Meng Nai Qing
Published: December 2013

Through the bending capacity test on the aging reinforced concrete beam before and after being strengthened with CFRP, the load-deflection curve and the bending capacity of the beam were obtained. The test showed that the capacity and stiffness of the beam with CFRP increased in various degrees, the post-strain of CFRP caused by secondary load would affect the high tensile strength of CFRP, and the bending capacity of the beam with CFRP decreased due to the change of material mechanical properties of the corroded reinforced concrete beam. Based on the material mechanics properties of aging reinforced concrete beam, the numerical simulation technology of the whole curve process of aging reinforced concrete beam strengthened with CFRP was established. The calculation results coincide well with the results of test, which provides reference for the calculation of strengthening design of aging reinforced concrete beam.
Research of the Thermal Performance of a New Type of Rock Wool Color Steel Sandwich
Authors: Ding Ke Wei , Sun Wu , Chen Dong
Published: December 2013

This paper introduces a new type of rock wool color steel sandwich which is produced by Anhui sambo steel co.,Ltd. The thermal performance analysis of this kind of sandwich is conducted through the finite element software ANSYS in this paper, which reveal the widespread existence of cold bridge phenomenon. And this paper also propose several new ideas on how to reduce the cold bridge condensation of interior wall panels of building.
Effect of Near β Heat Treatment Process on Microstructure of TC18 Alloy
Authors: Quan Hao , Qiu Ke Hui , Huang De Ming , Liu Jin Yan , Chen Rong
Published: December 2013

The effects of near β heat treatment on the microstructure of TC18 alloy during three temperature stages were studied. The results show that the microstructure of the sample is tri-modal microstructure after near β heat treatment, and the size of αp does not significantly, but dispersible αs increases and has a tendency to merge, and then it would not grow up anymore ; β phase would grow up, but the grain boundary has some broken. The experiment result shows that the tri-modal microstructure could obtain high damage tolerance properties of titanium alloy in theory.
Effect of Particle Size of BNT Filler on Dielectric and Mechanical Properties of LCP Based Composite
Authors: Chun Myoung Pyo
Published: December 2013

The effect of particle size of BNT filler on the microstructure, dielectric and mechanical properties of the x BNT - (1-x) LCP composites (x = 40 Vol.%) was investigated with SEM, Impedance analyzer and Universal Test Machine, where BaNd2Ti4O12 (hereinafter referred to as BNT) and Liquid Crystal Polymer (hereinafter referred to as LCP). BNT fillers of median particle size of 2.45, 1.39 and 0.69 um were obtained by ball milling for 24, 48 and 72 hours, respectively. BNT and LCP powder were mixed uniformly with twin screw type extruder. Disk samples of 20 mm in diameter and 1 mm in thickness were fabricated with hot press using mixture. As the particle size of BNT filler decreases from 2.45 to 0.69 um, the dielectric constant of composite measured at 10 kHz increases monotonically from 4.8 to 7.2 and its tan δ increases linearly from 0.0052 to 0.0068. Its flexural strength also enhanced with increasing the particle size of BNT filler. It was observed that the smaller particle size of BNT filler is more effective for increasing both dielectric constant and mechanical strength of BNT - LCP composite.
Simulation and Experimental Study of Oscillator for Permanent Magnet Vibration-to-Electrical Power Generator
Authors: Wang Zhi Hua , Zhang Mei , Li Na , Wang Li
Published: December 2013

This paper presents the simulation and testing of Vibration-to-Electrical Power Generators (VEPG) with different kinds of permanent magnet oscillators for scavenging ambient vibrations. The finite element method is used for magnetic fields calculation. Firstly, single permanent magnet type oscillators are simulated under the sinusoidal vibration. The calculation results show that the permanent magnet oscillator with diameter 20 mm and height 5 mm will realize 4 V peak-peak voltage. Secondly, multiple permanent magnets type oscillators are simulated under the same vibration and comparative studied with the single permanent magnet type. The results show that multiple permanent magnets oscillator with suitable structure will dramatically improve the power density of VEPG. By the end, prototypes with different kinds of oscillators are tested on the condition of sinusoidal vibration. And the experimental results agree well with the simulation ones.
Study on an Intelligent Teaching Dynamic Balance Technology
Authors: Cai Shu Ping , Zhao Ting
Published: December 2013

Abstract:.:Intelligent teaching Dynamic balancing is a new kind of dynamic balancing test system with various functions of teaching need. It integrates the hard bearing method using A, B, C size solution with soft bearing method using the influence coefficient method solution. The system is mainly composed of machine frame, intelligent electric measuring box, high sensitive sensor and far infrared phase sensor. It has the advantages of small volume, simple operation, security with low speed，reliable and convenient operation for students. It can deepen students' understanding of balancing knowledge, which has won the national utility model patent.
Study on the Equivalent Thermal Conductivity of Superalloy Honeycomb Core Structures
Authors: Xie Zong Hong , Sun Jun Feng , Li Wei , Zhao Jian , Yue Xi Shan
Published: December 2013

The equivalent thermal conductivity of superalloy honeycomb core structures have been studied by experimental method. Test results show that the decrease in honeycomb core height and the increase in honeycomb core diameter would lead to a lower equivalent thermal conductivity for superalloy honeycomb cores. Filling adiabatic materials such as ZrO2 fibers and SiO2 aerogels into core cells would significantly reduce the equivalent thermal conductivity of honeycomb cores with a minor penalty in structure weight.
Energy Consumption Modelling for Air-Cushion Vehicles
Authors: Xu Shuo , Sun Jing , Shen Jie Xi
Published: December 2013

Air-cushion vehicles (ACVs) provide a solution to transportation on soft terrain, whereas they also bring a new problem of excessive energy consumption to be solved. The prerequisite for energy consumption optimization is its modelling and simplification with respect to vehicle independent operating parameters. In a scenario of steady-state longitudinal drive condition, by employing slip ratio and load distribution ratio as independent parameters, dependent parameters and energy consumption are inferred and finally expressed as functions of the independent parameters. The method and result can be taken reference by studies of energy consumption modelling for air-cushion vehicles in different structures and also extensively for common electric vehicles.
Numerical Simulation and Comparison on the Inner-Flow Field in Hydraulic Feedback Pump
Authors: Xiao Shu Qin , Zhu Duan Yin , Liu Shuang Quan
Published: December 2013

Existing hydraulic feedback pump from the structure type can be divided into three kinds, big on the small,small on the big,big up and down. This paper focuses on the inner-flow field of three structural pumps about oil import and export of analyzing and comparing the velocity field and pressure field, chooses more suitable for hollow sucker rod oil production of hydraulic feedback pump.
Numerical Simulation of the Effect of Spoiler Ribs on the Flow Field in Household Soymilk Maker
Authors: Zhu Lian Hua , Song Qiang , Li Guo Ping , Ze Xiang Bo
Published: December 2013

The spoiler rib is a auxiliary structure of non mesh enclosure soy milk maker, it plays an important role in the process of crushing soybean. In this paper, we designed an orthogonal experiment according to different structure parameter of the spoiler ribs. By using the numerical simulation method, we can get the law of the flow field. We analysised the velocity, turbulence intensity distribution roles in the flow field of different rib's structure parameter, the model of power consumption. Finally, the optimal solutions were found by numerical orthogonal experimental design method in a several turn.
Environmental Analysis on Insulation Resistance Reduction Case
Authors: Qiao Li , Sheng Jian Feng
Published: December 2013

An insulation resistance reduction case was studied in this paper. An electrical component composed with metal panel, screw and insulation panel occurred flashover after 2-year service. Environment assessment, dust analysis and material analysis were done to find the reduction reason. The result shows that the reduction is caused by conductive dust aggraded on insulation panel surface; the aged surface of insulation material is favor for the conductive dust aggradation; humid air and high-hygroscopic dust accelerate this aggradation. It is suggested to improve the hydrophobicity and anti-aging property of insulation materials as well as increase the creepage for avoiding the kind of failure.
The Mechanical Model of the Dynamic Characteristics of the Bituminous Concrete Compaction Mechanism
Authors: Zhu Lin Long
Published: December 2013

In view of the industry status that the working performance of domestic bituminous concrete paver is not ideal and corresponding design theory is lack, this paper proposes the compaction system structures of screeding devices, sets up differential equations of vibration system of the freedom degree of the double eccentric block vibration compaction mechanism, sets up the mechanical model of dynamic characteristics of ironing compaction mechanism. With computer simulation, it studies the problems of dynamics of ironing compaction mechanism, analyzes the influence of changes of dynamical parameters of the ironing compaction mechanism on the dynamic characteristics of the system. The study of the dynamic response of ironing compaction systems and dynamic design has important theoretical significance and engineering application value.
Influence Parameters Analysis of Forming Quality and System Dynamics Simulation of Vertical Steel Bar Benting
Authors: Zheng Xi Jian , Wang Xin Zhuo , Zhang Jin Meng , Zhu Yu Fei
Published: December 2013

The vertical steel bar bending forming is a kind of new process of bending method. The bending speed, bending radius and clamping length H which is the parameters of vertical steel bar bending machine , is directly affect the quality of bending forming parts. This paper calculated the length of reinforcement before being incised and the springback angle of bending steel bar which obtained the reasonable cutting length and bending Angle; Then based on rigid-flexible virtual prototype technology to build the dynamics model of vertical steel bar bending system. Through simulation analysis ,it obtained the relationship between bending speed, bending radius , clamping length H and forming quality of bending steel bar. In this paper, the analysis method have reference value to the design of similar steel bar bending machines.
Effect of Height and Width of Road Humps on Deceleration Performance and Driving Safety
Authors: Lan Song , Gao Feng , Xu Guo Yan , Ding Neng Gen
Published: December 2013

Through the establishment of a five-degree-of-freedom vehicle model, calculating and analyzing the seat vertical acceleration, wheel ground adhesion index and the wheel dynamic load for the car with different speeds that runs over road humps having different height and width, so as to obtain the effect of height and width of the hump on the deceleration performance and driving safety. According to the comparative analysis of the seat acceleration, wheel ground adhesion index and the wheel dynamic load, so as to obtain the best speed limit range of the road hump.
Research on the Activity of Calcium Oxides under Various Calcination Temperatures
Authors: Wang Ya Li , Cui Su Ping , Yao Yan , Hou Ming Ming
Published: December 2013

In new dry way predecompostion cement production, after preheating, raw meal comes into a calciner, and occurs decomposition reaction, then freshly generated CaO comes into a solid-phase reaction process in the kiln. The three stages are closely related and interacted on each other. The formation rate of clinker mineral phases is closely related to the activity of CaO generated by the decomposition reaction, and high activity CaO is helpful to accelerate the formation of mineral phases and decrease the corresponding calcining temperature. However, there are large differences in activity values of CaO gennerated under various calcination conditions, and differet activated CaO has a different effect on the solid-phase reaction and dynamics of clinker formation. In this paper, in order to study the influence of different decomposition temperatures on the activity of generated CaO during solid-phase reaction, the content of free CaO after the reactions between the decomposition products of limestone under different calcination temperatures and SiO2was determined by chemical analysis, and the content of CaO involved in the reaction was calculated. The results show that at the limestone decomposition temperature of 900oC, the content of CaO participated in the reaction in clinker was increased, CaO activity was increased, these all were beneficial to the chemical reaction. Excessive decomposition temperature can decrease the reaction activity of CaO, so an appropriate decomposition temperature is necessary to make the majority decomposition of raw meal completed in the calciner, and ensure that generated CaO maintained a better activity state into the kiln to participate in the solid state reaction.
The Design and Implementation of Data Sampling and Processing System of EUV Camera Based on FPGA
Authors: Huang Liang , Li Xiang Zhi , Zhao Qing Lei , Han Cheng Shan
Published: December 2013

The FPGA is applied to the Extreme Ultraviolet camera (EUV) in the emerging aerospace applications. Firstly, the imaging principle of the EUV camera is analyzed, and the FPGA type is selected. Secondly, the data collection module is designed and the original data correction and coordinate conversion algorithm is researched. Finally, the simulation results indicate that the method which is used for this paper greatly improves the dependability and stability at the cost of the small speed loss.
Optimal Control for Vibration of Restrained Cantilever Fluid-Conveying Pipe
Authors: Bao Ri Dong , Dong Jun Feng
Published: December 2013

The cantilever fluid conveying pipe which restrained by linear spring and cubic nonlinear spring at its free end was studied and the nonlinear vibration of this piping system was carried out optimal control making use of piezoelectric patch as actuator. Firstly, the governing equations of the controlled system were derived out. Then the optimizer and mode sensor were schemed out. Finally, the control effect of the designed controller on system vibration was validated and analyzed through numerical simulation. The simulation results showed that the designed optimal controller can actualize effective control for the monocyclic motion, multi-cyclic motion and chaotic motion of the pipe conveying system. Meanwhile, the effect of state weight-matrix and control energy weighing coefficients on control performance of system, the influence of the position and length of piezoelectric patch on minimal performance index of system were also been under discussion. For practical application of this control method, we should synthetically consider all of the practical conditions and demands to select the optimal position and length of piezoelectric patch and the optimal weight value of state matrix and control energy according to different work conditions.
Topology Optimization of Thin-Shell Frame with Surface Loads
Authors: Ke Yong Guo , Ma Li , Du Yuan Yuan
Published: December 2013

A topology optimization method of thin-shell frame with surface loads is proposed in this paper and the mathematic model of this topology optimization method is introduced. Based on this proposed method, the procedure of lightweight design for special-shaped container is introduced, then, the lightweight design of 30t special-shaped container of heavy-duty dump truck is carried out. The result shows that the proposed method is very practicable and effective.
Survey of User Needs for Design Knowledge Management for Product Life Cycle
Authors: Zhang Dong Min , Song Yu Qing , Xu Yu Chun
Published: December 2013

It is important to develop an application to manage knowledge for reusing as efficiently as possible. Knowledge management in advanced manufacturing industries is a complex process. In this paper, user needs for design knowledge management are gathered from interviews with users and during brainstorming sessions. The main requirements for design knowledge management are such as: design knowledge normalizing, design case normalizing, knowledge tracing, generating know-how knowledge, learning failure case knowledge, and design knowledge management in product lifecycle, etc. Knowledge application scenarios for a new paving machine design are studied which would enable software function development.
Research on the Assembly Line Scheduling of Fixed Objects for the Large Complex Products
Authors: Lin Yi Li , Lu Jian Feng
Published: December 2013

According to the complexity of the assembly line for the large complex products, a new production pattern with fixed objects for the mixed model assembly line is proposed. Improved GA is used to solve the scheduling problem .In this paper, a production scheduling system is developed. It can speed up the production cycle, lower the cost, improve the productivity and so on.
A Method of the Green Product Configuration Design Based on Multi-Layer Generalized Operator and Genetic Algorithm
Authors: Liu Dian Ting , Jia Fei Fei
Published: December 2013

Taking the configuration design of the lifting device in a bridge crane as an example, this paper discusses the green optimal design method of enterprise's modular products with uncertain factors. The multi-layer generalized operators and comprehensive mathematical model under uncertainty are established based on the mapping relationship between product function and its structure. The model is transformed to an ascertaining combinatorial optimization model by de-fuzzy operator, and then it is solved by GA (Genetic Algorithm, GA). The method of chromosome encoding in binary that the chromosome is segmented by components and the genes in each segment are ranged as corresponding structures of each component, and the methods of selection and crossover and mutation operator are presented in this paper. The result of the green configuration design on the lifting device verifies the effectiveness and practical value of the method proposed in this paper.
Multi-Objective Dynamic Optimum Design of Crane Gearbox
Authors: Lin Teng Jiao , Geng Fei Yu , He Ze Yin , Lan Guang Ming
Published: December 2013

The lower vibration and lightweight design is of great significance to large mechanical equipment. In order to achieve the best dynamic performance of cranes, this paper presents a multi-objective optimization approach based on finite element method. Firstly, the finite element model of coupling system consist of gear-rotor-bearing-housing is established. Subsequently, the transient response of the gearbox is studied using modal superposition method. Then with the purpose of reducing the vibration and preventing sympathetic resonance, a multi-objective optimizer is developed by employing a parametrical design language and obtained the optimal combination of design parameters after several iterations. The method and conclusions can be used as a reference of dynamic modification of large machineries.
A Brief Review of Cardanol-Based Surfactants
Authors: Yang Xiao Hui , Wang Zhi Min , Jing Fei , Hu Li Hong , Zhou Yong Hong
Published: December 2013

Cardanol, as one of components of cashew nut shell liquid (CNSL), is a mixture of 3-n-pentadecylphenol, 3-(pentadeca-8-enyl)phenol, 3-(pentadeca-8,11-dienyl)phenol and 3-(pentadeca-8,11,14-trienyl)phenol. It has both the characteristics of phenolic compounds and flexibility of aliphatic compounds. As a versatile industrial raw materials, it has been widely used as modifiers of the phenolic resin, rubber plasticizers, coatings and adhesives etc. Specially, cardanol-based surfactants have been reported using with long-chain alkyl moieties as lipophilic group in recent years. Herein, the application of this natural and renewable material to both academic and industrial research of cardanol-based surfactants will be discussed.
Synthesis of 4-Hydroxyl Pyrazolo[3,4-d]pyrimidines from the Corresponding 4-Chloride Precusors with Acetic Acid
Authors: Sun Jian , Gong Shan Shan , Sun Qi
Published: December 2013

A novel and efficient method for the synthesis of 4-hydroxy-6-substituted-pyrazolo [3,4-d] primidines with acetic acid via phenol esters intermediate has been developed. Compared to the results obtained from the base substituted conditions, acetic acid catalyzed synthesis afforded target products in good yields.
QUALISYS System Applied to Industrial Testing
Authors: Malý Pavel , Lopot František
Published: December 2013

Qualisys is a camera system designed initially for 3D record of body motion that is firmly marked with special points called markers. Qualisys uses infrared range of frequencies and the main advantage of the system is the fact that it records coordinates of markers and therefore the need of complicated and often not accurate image analysis is not necessary. The system was used for measuring of properties and strength of partial supporting structure of refrigerating racks and for testing of completed prototypes. Strength and deformation resistance that were specified by maximal force of safe structural changes was determined during the testing. The loading capacity of prototypes was tested using by the producer described and standardized procedure. Monitoring of deformation propagation in different components and also the completed rack was performed using the Qualisys system which allows continuous measuring over a period of loading and unloading. The results of tests enabled to verify analytically or FEM gained preliminary results of calculations easily and promptly. This work should contribute to discover utilization of alternative measuring technologies that are common in many other branches. The application of these systems may influence significantly technical complexity of some solved issues.
Measurement of Torque Moment of Aircraft Electric Drive Unit
Authors: Rosa Jindřich , Cagáň Jan
Published: December 2013

Aircraft Propeller Testing Laboratory of VZLÚ Praha-Letňany has taken part in a project called EPOS the development of an electric drive unit for small airplanes, with power up to 60 kW. The article describes preliminary phases of power testing of the complete propulsive unit in its first design modification on a ground test stand. The torque moment was measured using a special shaft element equipped with strain-gages.
Distribution of Stress around the Graphitic Particles in Cast Iron Microstructure
Authors: Vavro Jan , Vavro Ján , Kováčiková Petra
Published: December 2013

The given work is focused on the analysis of the distribution of stress around graphitic particles in microstructure of the ductile cast iron with the spheroidal shape of graphite (SGCI) and grey cast iron with the lamellar shape of graphite (LGCI). The analysis was made with help of finite element method in the software system ADINA.v.8.6.2. On the basis of the real structure, the finite element method was used for creation of the model which was subsequently used for calculation of the distribution of stress in the material structure. The input data for numerical analysis were obtained on the basis of evaluation of the structure by help of image analysis. The numerical analysis proved that the graphitic particles in the matrix cause the accumulation of the stress and the distribution of the given stress depends on the shape of the graphitic particles.
Influence of Copper Ions on Mechanical Properties of PVA-Based Nanofiber Textiles
Authors: Rácová Zuzana , Ryparová Pavla , Hlaváč Richard , Tesárek Pavel , Nežerka Václav
Published: December 2013

The nanofiber textiles are utilized in the textile industry, as a treatment of exposed surfaces, they find their use in medicine and in future they might be used in civil engineering as vapor barriers. For some applications it is advantageous to use the textiles with special, e.g. antibacterial, treatment by means of silver or copper ions. This paper is focused on the determination of mechanical properties of PVA-based nanofiber textiles produced by electro-spinning. The polymer solution used for electrospinning contained copper in the form of ions. The results of the tensile testing were compared with the results for the reference sample without any additives. The results indicate that the addition copper ions cause an increase of the strength and stiffness.
Moment Capacity of FRP Reinforced Concrete Beam Assessment Based on Centerline Geometry
Authors: Zatloukal Jan , Konvalinka Petr
Published: December 2013

The flexural behavior of FRP (Fiber Reinforced Polymer) reinforced concrete beam has been the topic of intensive previous research, because of the spread of use of modern FRP composite materials in the building industry as concrete reinforcement. The behavior of FRP reinforced member is different from the one reinforced with regular steel reinforcement, mainly because of vast difference between moduli of elasticity of FRP composite reinforcement bars and steel. This difference results in the fact that conventional design methods used for years in the field of reinforced concrete structures using steel reinforcement give poor results if attempted use with FRP reinforced structural members. Results of conventional methods are so poor that use of such methods would be dangerous they tend to overestimate load carrying capacity and underestimate deformations both resulting in unsafe predictions. This paper points to formulating easy to use and comprehensible method of predicting moment capacity of FRP reinforced concrete beams subjected to bending loading and validation of the proposed method via set of experiments.
Method of Investigation of the Stress-Strain State of Surface Layer of Machine Elements from a Sintered Nonuniform Material
Authors: Kuzin Valery V. , Grigoriev Stanislav
Published: December 2013

A microstructural model of surface layer of machine elements from a nonuniform material is developed. With using of this model a calculation scheme that includes basic structural elements is created. Each element is characterized by the following properties: density, elastic modulus, thermal conductivity, linear expansion coefficient and Poisson's ratio. A mathematical model of surface layer of machine elements from a sintered nonuniform material is formulated on the basis of solution of two-dimensional heat-conduction and elasticity problems by the finite-element method. The created algorithms for solution of these problems are used for formation of an automated system for thermal strength calculations. This system is surrounded with some original techniques which provide the investigation of the stress-strain state of surface layer of machine elements from a sintered nonuniform material.
A Study of the Capability for Fire Resistance of Polypropylene Fibre Concrete
Authors: Chang Chuan Peng , Huang Shi Wu , Li Xue Feng , Tian Bo , Hou Zi Yi
Published: December 2013

The purpose of this paper is to examine the effect of various polypropylene fibre additions (length and content) to concrete on compressive strength and explosive spalling when subjected to high temperatures, which simulate the building or tunnel fires. The experimental results show that the compressive strength of polypropylene fiber concrete (PFC) and plain concrete decreases with increasing temperature. Fibre content in a certain range has a small effect on the compressive strength of the concrete, therefore the polypropylene (PP) fibers has a great influence on the anti-spalling behavior of concrete under fire loading to ensure the integrity of the structure. Keywords: concrete, polypropylene fibre, high temperature, compressive strength, spalling
Development and Challenge of the Overlay Design for Old Cement Concrete Pavement
Authors: Ma Feng , Wang De Jun , Jin Bao , Liu Fu Ming , Liu Yang
Published: December 2013

With the development of sensor, signal acquiring and processing technologies, amounts of overlay design methods for old cement concrete pavement have been proposed. However, there are difficulties in applying these methods to the real pavement under the long-term operational environments. In this study, the research achievements for resisting the generation and extension of reflection cracks of the old cement concrete pavement, developed over the last couple of decades and their applications, were summarized firstly, and then the primary challenge in applying these methods was discussed.
Review of Push-Off Tests for Base Friction of Cement Concrete Pavement
Authors: Yin Feng , Li Sili , Tian Bo , Niu Kai Min
Published: December 2013

Concrete pavement slabs experience volume change due to the variation of temperature and moisture level. The frictional drag acting on the bottom of slab due to the base friction is in the opposite direction of horizontal slab displacement, and resist against the horizontal slab movements. The magnitude of frictional force and horizontal slab displacement has interdependent relationship. In the present study, the interface friction of typical concrete pavements was evaluated by performing a number of push-off tests. In this paper, reviews of classical friction theory and friction characteristics at the interface of concrete slabs and the underlying subbases are presented.
Frost-Resisting Property of Bridge Concrete in Alpine Frigid Region
Authors: Guo Yin Chuan , Shen Ai Qin , Wang Jian , Zhao Hong Ji
Published: December 2013

Supported by the Guozigou-bridge, the paper studied the Frost-resisting property of bridge concrete in alpine frigid region. Researched the effect of water-binder ratio, fly-ash content, water consumption and air-entraining agent consumption, and reveals the impact mechanism of frost-resisting property of bridge concrete in alpine frigid region. Analyzed the influence rule of frost-resisting property and showed reference value of concrete's ingredient rate in alpine frigid region. The result showed that low water-binder ratio and water consumption can effectively improve the deicer-frost resistance of concrete and the influence of water consumption is more significant. Best air content between 4.5% ~ 4.5%.
Equipment Process of Online Testing Fresh Cement Concrete Rheology
Authors: Zheng Shao Peng , Tian Bo , Meng Rui Xuan , Fang Rui , Cheng Zhi Hao
Published: December 2013

Transforming the cement concrete mixer, simulating twin-shaft mixing process on large mixing plant, adding real-time acquisition equipment of torque and speed, and achieving the online monitoring of concrete mixing process. The influences of speed and stirring time on the liquidity of fresh cement concrete was deliberated, so that it were analyzed from three indicators of concrete slump, stirring torque and compressive strength to determine the optimum stirring speed 48r/min, reasonable mixing time 40s ~ 50s, and mixing time less than 100s.
Study on Precast Concrete Girders Curing System Based on Automatic Drip Irrigation
Authors: Sun Xiao Bin , Li Sili , Tian Bo , Wang Ji Liang
Published: December 2013

It is difficult to control quality for precast concrete girders in curing, so we set up the curing system of precast concrete girders with computer networks, automatic control of drip irrigation technology, database technology and two-dimensional code technology, With which we can control concrete girders curing continuously. Achieve well curing results, and storage the precast girders curing process temperature and humidity data, provide the data basis for quality assessment and acceptance of post-concrete structure.
Effect of Mineral Additives on Internal Relative Humidity and Dry Shrinkage of Light Weight Aggregate Concrete
Authors: Dong Shu Hui , Ge Yong , Feng De Cheng , Wang Feng Ping , Zhang Bao Sheng
Published: December 2013

Effect of fly ash and slag on internal relative humidity (IRH) and dry shrinkage of light weight aggregate concrete (LWC) are studied in this paper. As indicated in this test, mixed with mineral additives can reduce dry shrinkage of concrete. The more volume of fly ash and slag ash, the lower decrease speed of IRH is, which contribute to the decreases of dry shrinkage rate too. At the same curing-age and dosage, the relative humidity inside the fly ash concrete is higher than the slag one. As consequence, the rate of dry shrinkage of fly ash concrete is lower than slag concrete. Also, there is a significant linear correlation between the lowered values of IRH and dry shrinkage rate.