bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Welding Technology Experiment with Zirconium 702
Authors: Zhou Wen Chao , Luo Guo Qi , Zhou Wei , Xiao Shan Hua
Published: April 2014

The Experiment studies onthe welding technology and the process phenomenon of zirconium 702. The resultsshow that it can obtain high-quality weld seam to strictly clean before welding,to use the special tooling for being protected by high- purity argon, to selectthe reasonable technologicalparameters of tungsten argon arc welding,and to reasonably process groove forms.After welding, thetest plates are all qualified in the visual inspection,PT, RT, mechanical property test, the macro-metallographic test and corrosiontest.
Testing of ABS Material Tensile Strength for Fused Deposition Modeling Rapid Prototyping Method
Authors: Novakova-Marcincinova Ludmila , Novak-Marcincin Jozef
Published: April 2014

In paper are presented information about materials used for production of models by Fused Deposition Modeling (FDM) rapid prototyping technology. In today's rapid prototyping technologies the initial state of building material can be in solid, liquid or powder state. The current range materials include plastic, nylon, wax, resins, metals and ceramics. In FDM are mainly used as basic materials ABS - Acrylonitrile Butadiene Styrene, polyamide, polycarbonate, polyethylene and polypropylene. Main part of the paper is focused on experimental testing of Acrylonitrile Butadiene Styrene materials realized by different research teams and presents outputs of testing of ABS material in FDM technology realized by authors.
The Development and Application on Composite Resin Substituted for Cement Slurry
Authors: Xie Gang , Yu Ji Liang , Lin Sha , Wei Li Li , Xie Juan , Jiang Wei Qi , Xiao Yun , Zhang Wei
Published: April 2014

A type of composite resin substituted for cement slurry was developed for channelling and leakoff blockage in oil production and water injection wells of sandstone reservoirs in Huabei oilfields.Laboratory evaluation showed that the controlled reaction time was 3~8h at 40~110°C,the tensile strength of curing samples was 10.8 ~ 13.1 MPa, the compressive strength 13 ~ 87MPa, and the shear strength 9.2 ~ 28.9MPa.Any corrosion ratio in 10%HClNaOHNaCl was less than 1% at 100°C for 24 hours. Field application was successful and the pressure drop was less than 0.5MPa after shuting down for 30min.
The Manufacturing Technology Research of Composite Resin Transfer Molding
Authors: Liu Zhan Jun
Published: April 2014

The main requirements of preparation of composite materials in aerospace industry are affordable , highly automated and good quality control.To reduce the mold cost and shorten the production cycle, the aviation industry is focusing on weaving technology,advanced spread with technology, autoclave technology, injection process, advanced curing process;,all quality concept and thermoplastic process. The main principle of RTM process is laying reinforced material form in the cavity, in accordance with the requirements of performance and structure, injection equipment will be used by special resin system of closed cavity, mold has fastening , injection mould with peripheral seal and exhaust system, which ensures that the resin flow smooth out all the gas in the cavity side by side and infiltrating fiber thoroughly, it also has heating system, which is used as heating composite components of.curing forming.
Numerical Computation for Effective Mechanical Properties of Honeycomb Core Structure
Authors: Meng Xi Hui , Ma Xiao Yu , Zheng Xiao Ya
Published: April 2014

This paper combined the homogenization method with finite element method. The equivalent mechanical coefficients of the hexagonal aluminum honeycomb core were computed on ABAQUS platform by developing the user subroutine UEXPAN ( ) and Python script file. The results obtained with homogenization method were compared with those obtained with energy method, and it showed the feasibility of homogenization method. Then the effects of thickness-to-length ratio t/l on equivalent mechanical coefficients were taken into account. The results suggested that the equivalent in-plane mechanical parameters vary non-linearly with respect to t/l, while the equivalent out-of-plane mechanical parameters vary linearly with respect to t/l, which will provide reference for optimizing the design of honeycomb core structure.
Research on Tube Sheet Welding Dynamic Simulation and its Stress Characteristics Based on ABAQUS
Authors: He Qing Zhong , Wang Pu Quan , Yan Yun Qi , Guo Shuai , Duan Peng
Published: April 2014

The article aimed at Heat exchanger tube sheet welding experiment and its processing technology programs in a certain enterprise and using the ABAQUS software to proceed simulation on high strength and matrix alloy surfacing transition alloy materials (soft or corrosion protection), which can acquire the temperature and stress field after welding which has been testified the rationality by test result, then determining the suitable heat source model and the welding parameters. At the same time, welding dynamic simulation research result provide adequate theoretical basis for welding test and lay the foundation of optimizing the process and method of surfacing welding. Through the methods of combining theoretical research and experimental verification,under the premise that meet tube sheet properties and strength of materials and related technical requirements,which reduce test cost and time and shorten manufacturing cycle and the methods have guiding significance for establishment of welding procedure.
Study on High Oxidation Rate Refractory Ore of Lanping
Authors: Yang Xiao Feng , Liu Quan Jun , Deng Rong Dong
Published: April 2014

Lanping County of Yunnan has a difficult used ore of high oxidation rate lead-zinc, lead mainly include cerusite, followed by galena, a small amount of phosphorus (arsenic) lead and lead chloride (iron) alum; Zinc mainly include hemimorphite,a small amount of sphalerite. grade of lead is 6.83% , zinc 4.95% , lead oxide ratio is 91.74%, zinc 98.76%, so the ore is a high oxidation rate of refractory lead-zinc.Through extensive testing, ultimately used flotation process.Through the closed-process,lead concentrate’s grade is 44.98%, zinc 1.95% , recovery of lead is 72.62%;zinc’s concentrate grade is 21.20%, lead 2.50%, zinc’s recovery is 69.53%, the experiment has a good result.
Study on One Acrylic Ester of Cytosine
Authors: Geng Li Li , Ren Xue Min , Mao Wei Xi , Song Xiao Ming , Ji Yong Feng , Yuan Wei
Published: April 2014

One acrylic ester of cytosine was synthesized by a facile method, and its molecular structure was characterized by NMR, HRMS, and X-ray crystallography. In this paper, the crystal structure of the analog is described and the available data of cytosine. The X-ray crystallography showed that the adjacent molecule of cytosine Derivatives was tied to form analogous antiparallel β-sheet arrangement.
Analysis of Degradation and Performance of SOFC Cathode
Authors: Liu Run Ru , Wang De Jun , Jing Leng
Published: April 2014

Electrochemical reaction occurring in the SOFC cathode is the reduction of oxygen, therefore cathode materials for SOFC have to posses many properties. It is necessary to evaluate the performance and degradation of SOFC cathode since improvement of long-term stability is one of the major issues during SOFC commercialization process. The scope of this paper is focused on analyzing the chemical degradation of LSM cathode induced from many sources by GCI technique both from theoretical and experimental sides. This research is important toward the commercialization of SOFC because it could offer valuable information to overview chemical degradations from the SOFC cathode and develop strategy to realize high-durable SOFC.
Identify Carbonate Lithology by Fuzzy Mathematics
Authors: Liu Wei Fu , Liu Shuang Long , Sun Li Xin
Published: April 2014

In accordance with low success ratio of lithology identification in carbonate formation, a made of Identifying lithology of carbonate rocks through fuzzy mathematics has set up. 8 logging parameters reflecting lithology of carbonate rocks were selected and threshold values were determined. Lithologies of carbonate rocks were classified by using this identification mode and maximum subordination principle. Using field data identified 10 types of carbonate rocks, and they were compared with the result of core analysis, showing 85 % consistency. Therefore this method has higher accuracy for identification of carbonate lithology, and is quite promising in geological application.
A Water Heater with Spraying and Heating Function Based on PLC
Authors: Chen Kai Jun
Published: April 2014

When bathing in winter, people often feel cold and wet. In order to solve this problem, a new type water heaters combining with the characteristics of atomizer and traditional water heater will be designed, so as to improve the environment temperature of bathroom. In this paper, design of the programmable controller which is applied to this new type of water heater is introduced, and the control principles of the atomizing heating process and the whole system are presented in detail. The novel solar water heater based on PLC not only has the effect of energy saving and environmental protection, but also works in a reliable way.
Application of AIS in Ship Collision Prevention
Authors: Wang Jian Yu
Published: April 2014

This paper introduces the Working principle of AIS, emphatically introduces the main function and the application of AIS in ship collision prevention, illustrates the function of each module and the feasibility of making automatic decision, and the development status and application prospect of AIS is preliminary discussed. The AIS information contains almost all the necessary information for ship collision prevention, using the information for collision prevention decision-making, has a high credibility and broad application prospects.
Based on the Finite Element Software ANSYS/LS-DYNA Metal Plate Covering Parts Forming Process Simulation and Optimization Research
Authors: Wang Jin Ling
Published: April 2014

The design of cold punching mould CAD/CAM and the combination of CAE analysis can advance analysis of stamping process program, eventually get ideal stamping parameters, realize design automation, save resources and reduce dependence on experience, reduce the demand for skilled workers. This paper, by using nonlinear dynamic finite element software ANSYS/ls-dyna continuous function, simulation of sheet metal forming process and unloading plate deformation, forming process, at any time throughout the von mises stress nephogram should rebound and strain values and unloading plate material as a result, analysis help us better understand the changes of the internal material sheet metal stamping process.
Design of Intelligent Locomotive Based on STC12C5A60S2
Authors: Chen Li Gang , Yang Xue Feng , Qu Bo
Published: April 2014

To solve the intelligent locomotive can be turn around precisely on the preset orbit by others, It has the ability to identify the environment accurately, such as surrounding temperature, solid distance and color, the humidity of the environment and so on.Combined with the price, A method is proposed by using STC12C5A60S2 microcontroller as the core control of the intelligent vehicle.We use the infrared tube module tracking black track, it can turn 90 degrees or 360 degrees precisely when it track to a positioning point. To accurately detect point target by adopting the temperature detection module, ultrasonic distance measuring module, a color recognition module, humidity detection module, it can be real time display data by LCD module 12864,it can be reach the end of accurate parking .The experimental results show that it completely meets the requirements, This method is simple, accurate and efficient.
Design of Swash Plate Axial Piston Pump Flow is Stable
Authors: Chen Kai Jun
Published: April 2014

Marine auxiliaries in the pump is the largest number, the most species of ship equipment. The pump is non-uniform flow before.This paper designed several swash plate axial piston pump, in order to solve the problem of uneven.
Design Research of Armored Vehicle Maintainability Evaluation System Based on Virtual Prototype
Authors: Xu Da , Li Chuang , Liu Shu Lin , Li Yang
Published: April 2014

Aiming at the characteristic of virtual prototype, this paper structured armored vehicle maintainability evaluation system, and studied the method of maintenance evaluation in the virtual environment. At last an example is used to
6245687636xplain application prospect. It is significant for developing maintainability evaluation.
Experimental Study on Tension Performance of Anchor Group
Authors: Liu Ying Li , Jiang Tie Zhu , Huan Jun Hong , Xu Fu Quan
Published: April 2014

The torque-controlled expansion anchors, undercut anchors,bonded anchors and special inverted conical chemical anchors subjected to tension load, which including single anchor, two anchors, four anchors and eight anchors are tested. Failure mode and tension performance of anchor group are investigated, and test value and calculative value of ultimate load are compared. Experimental results show that some anchor group occur the concrete cone failure under tension load, and others occur steel failure under tension load. Test value and calculative value of ultimate load are compared, and the result meets well.
Research on Chip Formation Mechanism in Mold Processing of Large Diameter Fresnel Lens
Authors: Guan Jia Liang , Ma Xin Qiang , Cao Cheng Guo , Zhang Xiao Hui , Zhu Lei
Published: April 2014

This paper describes the analysis of the chip formation mechanism in mold machining process of large diameter Fresnel lens based on the ABAQUS finite element simulation software and modal test methods. Combined with the material constitutive relation and material failure criteria etc, a two-dimensional orthogonal cutting model was established and the chip derived from the simulation was compared with the chip from modal test, with a consequent verification of the feasibility of simulation chip model. The simulation contributes to an investigation into the effects of the cutting speed on chip formation process. The results show that: the material strength and plastic brittle have significant impact on chip morphology in the H62 brass mold processing, and material strength will improve with the increase of strain rate, the evolution process of the chip of material plastic reduction can be divided into: ribbon cuttings, serrated chips, cell chips.
Research on Connecting Device of Parent-Subsidiary Wind Sailing Boat
Authors: Zou Yin Cai , Zheng Wei Gang
Published: April 2014

The type of parent-subsidiary wind sailing boat with movable sub-ship, which includes the mother boat, the sub-ship, sail and the attachment of sail with hull. After finishing the research of the stability of the parent-subsidiary wind sailing boat, this project adopts the simulation technique, then made a detailed research about the connecting device of sub-ship with mother boat, and presented a type of connecting device called A, so as to apply to the modern ship, and make parent-subsidiary wind sailing boat has advantages of large thrust, high stability, low fabrication cost, and can satisfy the requirement of cargo handling, still can be used when the channel width are restricted or the channel is busy.
Study of the Anchorage Seismic Performance for Beam-Ends Strengthened by Bonded Rebars
Authors: Liu Ying Li , Tao Li Xing , Huan Jun Hong , Xu Fu Quan
Published: April 2014

This article firstly designed four specimens, including a contrastive specimen and three chemical anchorage reinforcement specimens which reinforcing the beam ends in different ways and then applied low-cycle reciprocating to the four specimens. This paper analyzed the anchor failure performance of the anchorage specimens by testing and data .The research concluded that the chemical anchorage can meet the component single drawing to components yield without failure. With the increasing of the loading series and the cycles improving, the parts of the anchor bars were pulled out.
Study of the Modeling and Simulation for Waste Briquetting Machine Based on the Compression/Pushing Mechanical Hydraulic System
Authors: Wang Meng , Wang Shou Cheng , Duan Jun Yong , Zhang Peng Cheng
Published: April 2014

The Waste Briquetting Machine is the main equipment of waste transfer-station, it is also a kind of machine which is controlled by hydraulic system to compress the collecting rubbish into pieces, which realize the reduction of the rubbish to be convenient to transport. This article chooses the buried waste briquetting machine and based on the AMESim software to modeling the compression/pushing mechanical hydraulic system. It also analyzing the single motivation in an unloaded condition and simulating in an as-clad condition. The conclusion is in accordance with the theoretical analysis, which has provided a valuable reference to the study of the waste briquetting machine hydraulic system.
The Design of the Hawse Pipe and Intelligent Positioning
Authors: Shi Ji Wei , Li Hong Yuan , Li Bing Zhen
Published: April 2014

The ship mooring system is an important installation for anchoring, the performance of ship mooring system affects the safety operation of the ship. Hawse pipe arrangement is the most important part of the ship mooring equipment layout design, the hawse pipe layout will directly affect the feasibility and convenience of ship mooring system in use. During traditional ship mooring equipment layout design, designers should firstly calculate the outfitting number, and inspect the specification manually to select mooring equipments, then design the hawse pipe layout with their experience by hand. In the previous ship mooring design work, the work efficiency is low. If ship line or general layout changes, designers need to re-check the mooring function and once mooring system can't meet the requirements, they need to re-design. This affects the overall design of the ship adversely. This paper is based on CAD platform, it researches the ship mooring system especially the hawse pipe intelligent layout design. Through using computer programs, drawing the hawse pipe section automatically and selecting optimal layout of the hawse pipe is achieved. This method improved the rationality of the design of the ship mooring system arrangement. This method can reduce the traditional burden of manually inspecting, and make the hawse pipe layout design more efficient.
The Research on Based on Secondary Regulation of Swing System of Hydraulic Excavator
Authors: Yan Yun Qi , He Yuan Cheng , Meng Zhi Ming , Kang Shuai Shuai
Published: April 2014

In order to recycle energy during rotary phase of hydraulic excavator in the braking, this paper proposes a hydraulic slewing system based on secondary regulation control. In the constant pressure network, secondary regulation system can make variable motor reach the set speed quickly and smoothly through the motor PID feedback control, which can control power of the whole system ,while the general volume transmission system mainly through changing the flow of pump. Accumulator is used to recycle braking energy and reuse for next acceleration,which improve work efficiency. The simulation results shows that the energy recovery and reusing efficiency of rotation braking recovery system are 65.9% and 47.3%, the system achieves the goal of energy conservation and emissions reduction.
Development of Functional Knitted Fabrics Made from Bi-Component Chitin and Wool Fibre
Authors: Song Yao , Liu Yan Jun
Published: April 2014

The paper briefly introduces main characteristics of chitin fibre, primary issues of wool knitted materials application in next-to-skin apparel and design of applying chitin to different wool fibre fabric. It focuses on design processes of knitted fabric, including principle of materials proportion and specification, and technique of fabric texture design. Notices regarding needles arrangement, knitting notation, and cam-setting etc. during fabric knitting, as well as production basis are also presented hereon.
Development of High Transparent Polypropylene
Authors: Yang Xin Li
Published: April 2014

Due to the low transparency and poor gloss, the applications of ordinary opaque polypropylene are limited largely in the field of food, medicine, medical instrument and packaging. One of the ways to solve the defects mentioned above is to develop transparent polypropylene which is industrialized via polymerization and processing. The article introduces the progress of high transparent polypropylene (HTPP) all over the world.
The Design of 25KV High-Frequency High-Voltage Power Supply
Authors: Jiang Qiang
Published: April 2014

In this paper, a HV and HF switch power supply was designed, which was controlled through a single chip microcomputer, also the MOSFET was used as the switch power tube. The PWM (pulse width modulation) technique and half-bridge inverter topology have been used to invert AC into the DC that can be adjust from 0V~25KV and the operating frequency is 35KHz, Through the simulation with the Saber software and practical use, the feasibility of the scheme and the correctness of the design have been verified.
Brief Analysis of MIMO Channel and Antenna
Authors: Wang Huan , Zhou Jian
Published: April 2014

MIMO (Multi-input Multi-output) is an abstract mathematical model used to describe the multi-antenna wireless communication system. the transmitter can use a plurality of separate antennas transmit signals simultaneously. This paper first analyzes MIMO physical model, and then the MIMO channel characteristics and capacity for analysis, analysis of MIMO antenna characteristics and finally focus on the correlation coefficient
Extrusion Mould General Work Part of the Design and Analysis
Authors: Yang Hong Cai , Wu Ming Qing
Published: April 2014

The analysis of the composition of cold extrusion die, extrusion die working part, backward extrusion die parts design, at the same time the plunger design, analyzed the packed dimension and tolerances of convex die and concave die manufacturing.
Large Deformation Analysis of a Dielectric Elastomer Membrane
Authors: Cui Lei Lei , Li Li
Published: April 2014

Due to the capability of high strain, dielectric elastomers are promising for applications as transducers in cameras, robots, valves, pumps, energy harvesters and so on. This paper focuses on the large deformation analysis of a dielectric elastomer membrane.The membrane is initially flat and attached to a disk in the inner circle and to a rigid ring in the outer circle, then a weight is applied to the disk and the membrane deforms into an axisymmetric shape, undergoing large out-of-plane deformation. The membrane is assumed to behave elastically in accordance with the ogden law. The governing equations are derived by combining kinematics and thermodynamics and a set of ordinary differential equations (ODEs) are obtained finally. The ODEs are solved by using shooting method. The obtained results show that the deformation field in the membrane is very inhomogeneous.
Research and Development of Agricultural Machinery Operating Area Measuring System Based on Single Chip Computer
Authors: Su Bing Ling
Published: April 2014

Mechanical products is widely used in agriculture now, but lacks a kind of operating area measuring system. Therefore, a kind of Intelligent operating area measuring system, simple structure, convenient operation and reliable performance has been developed.
GPS Positioning System Design Based on Micro Control Unit
Authors: Liu Xin , Feng Zhen , Zhang Yao Yuan , Liu Si Qi
Published: April 2014

This device uses GPS module to sample the data, and transmits data with the wireless module. The handheld terminals can display information such as longitude, latitude, time independently. The transmitting section collects data which is parsed and processed by the MCU, and displays it on the Liquid Crystal Display (LCD). The receiver receives and analyses wireless data, then displays the data including the current geographic information through the upper machine at the same time. Experiments show that the device could realize the function of positioning and transferring information within 200 meters and we could also use Google Map, the PC software, to get map information. This device, compared with the traditional system, is small in size, light in weight, easy carrying and can accurately position an object. It can be widely used in the sphere of investigation, exploration, navigation and positioning.
Multifractal-Based Texture Analysis for SAR Images
Authors: Xu Xin , Chen Yi Wang
Published: April 2014

SAR images are widely used in land use cover classifications. This paper proposed using multifractal spectrum parameters to analyze texture of SAR images. First multifractal theory and spectrum calculation method were introduced. Multifractal spectrum of a chaos representation was gotten with the method. From the spectrum curve, five parameters were found to describe the curve features. Then the physical meanings of five parameters in multifractal spectra were analyzed. Multifractal spectra of three kinds of textures in a SAR image are calculated, and five parameters are extracted. Finaly we analyzed the three textures according to physical meanings of five parameters. It is seen that the parameters of multifractal parameters can be used to describe different SAR image textures. It is a novel way to distinguish SAR image textures by multifractal spectrum parameters.
Logistics Business Optimization of Small and Medium-Sized Garment Manufacturing
Authors: Sun Xue
Published: April 2014

With the development of modern logistics management, enterprises begin to pay attention to their logistics system. Logistic system optimization also becomes more important to small and medium-sized garment manufacturing. This article analyzes current situation of small and medium-sized garment manufacturing, and provides logistics business process optimization strategies including logistics business process reengineering, logistics e-commerce systems construction and logistics mode selection to help small and medium-sized garment enterprises to improve logistics efficiency.
Improve the Efficiency of RM80 Ballast Cleaning Machine
Authors: Zhang Meng , Liu Mei Hong , Jiang Lei
Published: April 2014

The future development and the general situation of ballast cleaning machine are summarized. The structure, working principle of RM80 ballast cleaning machine are introduced. The problems of the railway maintenance are analyzed. The domestic research results of recent years are compared. To increase the efficiency of the RM80 ballast cleaning machine the rail and frame should be analyzed and the body structure should be optimized.
The Design and Kinematics Analysis of an Underactuated Cable-Truss Mechanism
Authors: Wu Nan , Liu Rong Qiang , Guo Hong Wei
Published: April 2014

Although underactuated mechanism has been widely studied in recent years, little information is available on that with cable-truss. An underactuated cable-truss mechanism was presented in this paper. This serial mechanism consists of five quadrilateral cable-truss units and moves by changing the length of the cables. It can be extended to large-scale spatial gripper and has advantages like light weight, simple structure and high reliability. This mechanism can capture the object without its precise position and shape. The kinematics analysis was discussed considering the characteristics of different ways to capture and a numerical example was given. The results of motion simulation corresponding with the example were shown to verify the correctness of the theoretical analysis.
Preparation and Thermal Stability of Pyrrole and m-Toluidine Copolymer/Montmorillonite Composites
Authors: Wang Hong , Li Ming Tian , Lu Yue , Liu Di
Published: April 2014

Pyrrole and m-toluidine copolymer (P(PY/MT)) / montmorillonite (MMT) Composites were prepared by in situ chemical polymerization of pyrrole with m-toluidine monomer in the presence of montmorillonite. The structural, morphological and thermal properties of these composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). X-ray diffraction result for P(PY/MT)-MMT illuminated the intercalation of P(PY/MT) copolymer between the clay layers. The FT-IR result showed the successful incorporation of montmorillonite clay in the prepared P(PY/MT)/MMT composite. The higher thermal stability of high MMT content rate might be attributed to its higher chain compactness due to the interfacial interaction between the P(PY/MT) and the clay.
Synthesis and Properties of Novel Cashew-Based Sulfonate Gemini Surfactant
Authors: Shi Wei Guang , Wang Peng Xiang , Ma Xiao Gang , Li Cui Qin , Wang Jun
Published: April 2014

A novel cashew-based gemini surfactant was synthesized from cashew phenol, 1, 3-dibromopropane and chlorosulfonic acid through etherification, sulfonation and neutralization. The critical micelle concentration (cmc) for cashew-based gemini surfactant was 6.2×10-2 mmol·L-1, the surface tension (γcmc) was 36.92 mN.m-1. Foam properties and emulsification properties were investigated including the affection of inorganic salts and sodium hydroxide. The oil / water interfacial tension can be decreased efficiently to 10-3mN / m.
Influence of Spur Gears Hardened Method to Allowable Stress Numbers for Bending
Authors: Jonšta Petr , Maršálek Petr , Havlík Jiří , Jonšta Zdenĕk , Valíček Jan
Published: April 2014

The presented paper deals with comparison of spur gears classical and modern hardening process of the bending fatigue properties. It concerned particularly the hardened surface of the tooth flank using optical source of electromagnetic radiation. The results of fatigue tests were obtained on a servo-hydraulic testing machine LFV 100 kN made by walter+bai ag. These tests were defined by the standard ISO 6336 as method B, when testing is carried out under reference conditions close to the real operation. Comparison of test samples is also carried out on the basic of the achieved local hardness and hardened layer thickness in the tooth root, which is an initiation of fatigue crack.
Damage Identification in Beams Using Experimental Data
Authors: Palechor E.U.L. , Silva R.S.Y.C. , Bezerra L.M. , Bittencourt T.N.
Published: April 2014

There are several techniques for non-destructive damage detection in structures. However, they are costly and require a very precise analysis of the extent of the structure. Numerical methods can help in nondestructive testing of structures, showing the possible location of the damage and thereby decreasing the area of analysis and constituting less expensive non-destructive tests. Outstanding among the numerical methods most used to detect damage are the finite element method and the boundary element method. This paper presents the application of wavelet transform for damage detection to the static response of a beam (profile I) simply supported with a point load. Damage simulation was achieved using saw cuts in the top and bottom flanges of the beam.
Design of Water Pressure Sensor Applied to the Eye Aqueous Humor Detection
Authors: Tan Qiu Lin , Zhang Xian Sheng , Ding Li Qiong , Zhou Zhao Ying
Published: April 2014

Aimed at the dynamic pressure measurement, this paper presents a pressure sensor based on MEMS technology. An absolute pressure sensor is in one silicon chip of which the size is 3.05mm×3.05mm with the diaphragm thickness of 890μm. We combine Piezoresistive Bridge with signal conditioning chip, and design a gain adjustable, high sensitivity dynamic pressure sensors. By changing the depth of the sensor in water, the resulting change in the resistor signal is then used to calculate the depth of the water. The experimental results show that the measuring accuracy can reach 2×10-4V per 1mm (water depth). The design of the hardware circuit was simple, flexible configuration, versatile features. It was found that the pressure sensor bad a linear response to pressure as expected, and was more sensitive than conventional resistor sensor. Sensor, small size, high sensitivity, will be providing a better way to measure eye aqueous humor.
The Design and Simulation of Vibratory Ring Gyroscope
Authors: Meng Mei Yu , Zhang Wen Dong
Published: April 2014

This paper deals with design and simulation of vibratory ring gyroscope which has good performance as resisting vibration, resisting impact, small temperature drift because of the inherent symmetry of structure. The good performance of gyroscope has verified by detailed modeling and simulation. The manufacture of gyroscope using wafer level vacuum packaging technology making the gyroscope has high quality factor .At last we test the gyroscope and the Q factor is 20300 by detecting the resonant state of the gyroscope.
A SOI-MEMS Based Resonant Barometric Pressure Sensor with Differential Output
Authors: Luo Zhen Yu , Chen De Yong , Wang Jun Bo
Published: April 2014

This paper presents a laterally driven resonant barometric pressure sensor fabricated using SOI-MEMS technology. In this device, pressure under measurement causes a deflection of a pressure-sensitive silicon square diaphragm, which is further translated to stress build up in H style doubly-clamped micro beams, leading to resonant frequency shift. In device fabrication, SOI-MEMS fabrication processes were utilized, where a new modified buffered hydrofluoric acid (BHF) solution was used to remove the buried oxide layer and release the suspended resonant beams. Experimental results recorded a device resolution of 10Pa, a nonlinearity of 0.04% and a temperature coefficient of-0.04% F.S/°C in the range of-40°C to 30°C. The long-term stability error of the proposed device was quantified as 0.05% F.S over the past 3 months.
Silicon Thermal Flow Sensor Based on Ceramic Substrate
Authors: Chen Sheng Qi , Zhou Lin , Qin Ming
Published: April 2014

A silicon thermal flow-sensor system based on ceramic substrate is described in this paper. The sensor chip is mounted on a ceramic substrate with a metal heat sink. The simulation by ANSYS software and the experiment are done for determining suitable package size. The results from the ANSYS simulation and the standard flow test in the flow tunnel show that when the radius of the ceramic is 10mm and the heat conduction is35Wm-1K-1, the performance of the sensor is much better. The heat sink will make the flow-sensor more stable. The wind speed up to 35m/s and the precision of 0.5m/s are acquired in this experiment.
A 16 Bits Sigma-Delta Modulator Applied in Gyroscope
Authors: Fu Qiang , Chen Wei Ping , Zhao Ying Kai , Yin Liang , Liu Xiao Wei
Published: April 2014

In this paper, a 4th-order sigma-delta modulator applied in gyroscope is presented. This modulator adopts the 2-1-1 Multi stage noise shaping structure. The bandwidth of signal is 100 KHz, the over sample rate is 64, and sample frequency is 12.8MHz. By the MATLAB Simulink modeling and simulation, when the input signal is 100 KHz, the SNDR of the MASH ADC is 121.8dB, and the effective number of bit is 19.93 in ideal situation. After considering non-ideal factors, the SNDR is 111.6dB, the effective number of bit of ADC is 18.28. Compared with the ideal situation, the noise floor of PSD has increased 40dB. It explains that non-ideal factors have a significant effect on the performance of the sigma-delta ADC. The 4th-order MASH sigma-delta modulator has been implemented under 0.5 um CMOS process and simulated under Cadence. The final simulation results show that SNDR is 112.4 dB and effective number of bits (ENOB) is 18.6.
Characteristics Research of Hall Magnetic Sensor Based on Nano-Polysilicon Thin Film Transistors
Authors: Zhuang Cui Cui , Zhao Xiao Feng , Song Yu , Wen Dian Zhong , Jin Jian Dong , Yu Yang
Published: April 2014

In this paper, we presented Hall magnetic sensors based on nano-polysilcon thin film transistors(TFTs). These sensors are fabricated on the <100> orientation high resistivity silicon substratesby using complementary metal oxide semiconductor (CMOS) technology and adopting thenano-polysilicon thin films with thickness of 82 nm as the channel layers of TFTs. The influence ofthe channel layer doping type and channel length-width radio of TFT on sensor's sensitivity was investigated.When the supply voltage is 5.0 V, the maximum measured sensitivity of p-type channel andn-type channel sensors are about 8.5 mV/T and 25.6 mV/T, respectively. These experimental resultsmean that nano-polysilicon thin films present an application on Hall magnetic sensors.
The Design and Experiment of a Two-Dimensional Position Sensitive Detecting (PSD) Sensor Based on Avalanche Breakdown
Authors: Shan Yuan Yuan , Qin Ming , Chen Sheng Qi
Published: April 2014

A two-dimensional position sensitive detecting sensor (PSD) based on avalanche breakdown is introduced in this paper. The structure of the sensor is designed under the assumption that the breakdown of the PN junction in the sensor occurs at the bottom of the PN junction. The breakdown structure and characteristics of the sensor are simulated by Medici software and the doping structure and process conditions are calculated by Tsuprem4 software. By using COMSOL Multiphysics, we obtained current allocation of the straight and right angle type electrodes, which is corresponding to the optimal structure. In simulation, the root mean square error of the rectangular-shaped electrode and the straight line-shaped electrode are 0.198, 0.145 respectively. Experiment results show that in the 50% photosensitive area with the center as the origin, the rectangular-shaped electrode error is much smaller than a straight line-shaped electrode and fits in to linear relationship better. But the error of the angle the boundary of the electrode is significantly worse than the line-shaped electrode.
Fabrication and Characteristics of Silicon Bridge Magnetic Sensor Based on Nano-Polysilicon TFTs
Authors: Zhao Xiao Feng , Wu Tong , Cao Jing Ya , Wen Dian Zhong , Zhang Hong Quan , Zhuang Cui Cui , Yu Yang
Published: April 2014

A silicon bridge magnetic sensor based on nano-polysilicon TFTs is presented in this paper.It adopted four nano-polysilicon TFTs on the center of every squared silicon membrane edge to forma Wheatstone bridge, and then its squared silicon membrane center was sticked by ferromagnetic material.The sensor simulation was realized by adopting ANSYS software. The simulation results showthat based on the piezoresistive effect, the measurement to the external magnetic field can be achieved.According to the simulation results, we designed and fabricated the silicon bridge magnetic sensor byCMOS technology and MEMS technology. The experimental results show that when supply voltageof the sensor is 5.0 V, its full range (4.0 kGs) output voltage is 10.97 mV, and magnetic sensitivity is1.44 mV/kGs.
Accuracy Analysis of Quality Factor Measurement Based on Time Domain Method for MEMS Resonators
Authors: Wang Ling Yun , Du Xiao Hui , Su Yuan Zhe , He Jie , Li Yi Pan , Wu De Zhi , Sun Dao Heng
Published: April 2014

To reduce the measurement cost and time, a time domain measurement method of quality factor for MEMS resonator is presented in this paper. The relation curve between quality factor and vacuum level is obtained. The results indicate that measurement error is larger under high vacuum level when the sampling frequency is lower. The reason causing the error is analyzed and measurement precision is improved by increasing the sampling frequency. The measurement results indicate time domain measurement is advisable and improvable for MEMS resonator measurement.
Rapid Temperature Measurement of Meteorological Detection System Based on MEMS
Authors: Lu Yu Fei , Lou Wen Zhong , Guo Ming Ru
Published: April 2014

This paper is based on a meteorological detection system, which contains MEMS barometric pressure sensors, MEMS temperature sensors, MEMS humidity sensors and GPS receiver. The micro control unit of this system is based on C8051F120 microcontroller. By Comparing SHTXX series of temperature and humidity sensor and PT100 thermal resistance, we obtain a measurement scheme that can measure environment temperature rapidly and relatively accurate when the volume, weight and power are limited. It can meet the harsh environments and high reliable needs. In addition, the simulation analysis and the experiment of temperature are carried out.
Compact Polarization Beam Splitter Based on Surface Plasmon Polariton Silicon Waveguide
Authors: Yang Jun Bo , Shao Zheng Zhang , Xu Su Zhi , Xu Jia , Kuo Zhou
Published: April 2014

A compact polarization beam splitter (PBS) based on a silicon waveguide-silver nanoribbon-silicon waveguide is proposed and demonstrated numerically by utilizing the evanescent coupling between a strip-nanowire and a nanoslot waveguide. Two-dimensional (2-D) FDTD simulations were performed to elucidate the properties of surface plasmon polaritons (SPPs) in this device made from silicon-metal-silicon, and were found to agree well with the theoretical predictions. TE and TM polarized light are respectively separated into two different output ports of Y-shaped silicon waveguide in which the coupling efficiency is 62% and 45% for 1.55μm wavelength, respectively. The proposed PBS structure could be utilized to develop ultracompact optical polarization modulating device for large-scale photonic integration and optical information processing.
Focusing Actuating Performance of OPFC Phased Array Transducer Based on DPSM
Authors: Wang Zi Ping , Luo Ying
Published: April 2014

As a new functional composite material, Orthotropic Piezoelectric Fiber Composite (OPFC) may be developed conveniently actuators and sensors. By constructing multi-element linear array, the phased array transducers can generate special directional strong actuator power and high sensitivity. The advantage of the transducers is that no mechanical movement is needed to scan an object. Focusing beam is obtained simply only by adjusting a parabolic time delay. The DPSM (distributed point source method) is used to model the ultrasonic field by OPFC linear array transducer. Using this approach, beam directivity and pressure distributions are studied to predict the behavior of focusing as compared to current formulation of traditional transducer. The interaction effect of two OPFC phased array transducers is also modeled in the same medium. Which shows the pressure beam produced by the OPFC array transducer is narrower or more collimated than that produced by the conventional transducer at different angles.
Research of Optical Characteristics of Diffuser with Taper Microstructure by Micro Injection Molding
Authors: Wu Da Ming , Zhuang Jian , Zhao Zhong Li , Xu Hong , Huang Yao , He Xiao Xiang
Published: April 2014

In this paper, diffuser with taper microstructure has been put forward, and the transmission of the light in the taper microstructure has been analyzed. The software of Lighttools has been used to analyze the influence on light intensity distribution of the vertex angle θ, the space between the microstructure L, the diameter ratio of up to down of the microstructure A/B, the cutting output of the microstructure H and the refractive index of the diffuser n1.As a result, the light intensity of the optical axis will increase and visual angle will decrease when the vertex angle θ, the refractive index of the diffuser n1 and the cutting output of the microstructure H increase; the light intensity of the optical axis will increase and visual angle will decrease when the space between the microstructure decrease; with the increasing of the ratio A/B, the light intensity of the optical axis would first increase and then decrease, visual angle would first decrease and then increase. When A/B=0.4, the light intensity gets the maximum value, the visual angle gets the minimum value. The result of the simulation is significant to manufacture and research.
Research on Natural Frequency of MEMS Structure with Meander Suspensions by Mechanical Character Analysis
Authors: Li Yi Jun , Sun Ming Zhu , Zhao Xin
Published: April 2014

A new concept of using four meander suspensions as a constraint is proposed to construct planar spring-like energy harvester actuators with larger displacement. Meander suspensions with multi-folded beams having three vibrating directions. This paper introduce a new structure of “-type” to calculate modulus of elasticity of one meander suspensions. Based upon the micro deformation theory and the displacement superposition theory, the expression on the displacement for the movement end of the meander beams by outer forces and force moments are deduced. Since the energy harvester is geometric symmetry, elasticity coefficient and natural frequency of the energy harvester will be deduce by above given information. The finite-element analysis was used to model the performances and verified the above mentioned mechanic analysis method.
Effects of Structure and Air Damping on Quality Factor under Various Pressure Environments Based on Experimental Research
Authors: Wang Ling Yun , Wang Xiao Ping , Yan Xin , He Jie , Wei Jin , Yu Ling Ke , Cai Jian Fa , Sun Dao Heng
Published: April 2014

This paper presents an analysis about the variation of quality factor (Q-factor) aiming at the complex micro resonator to explore the mechanism of the energy loss under different pressures. To demonstrate the work, a series of resonators are designed, which mainly differs in the squeeze-damping and scale of the beam. According to corresponding structure, the Q-factor is measured at different pressures while the theoretical air damping model combined with Christians model is also proposed. The air damping models of three types are proved to have 10%~30% relative error compared to experimental results in low vacuum, respectively. And, for the high vacuum, the structural energy loss plays an important role on the Q-factor, which increases with the decrement of comb quantity and the beam width.
Effects of Droplets' Collision on Heat and Mass Transfer between High-Temperature Gas and Micron Water Droplets
Authors: He Guo , Wang Xiao Chuan , Li Yan Fei
Published: April 2014

The heat and mass transfer process between gas and micron water droplets is complicated. During the process, the collision of droplets can affect the evaporation rate of droplets, and the heat and mass transfer between two phases as well. Unsteady numerical simulation was done in this paper to investigate the effect of droplets collision on the heat and mass transfer. The results show that after the water droplets collide and combine together, the total heat transfer area decreases, thus the accelerated rate of droplet temperature drops. As a result, the unsteady time of droplet temperature rising with considering droplets collision in calculation is longer than that of without considering droplets collision. After droplets collide and combine together, the evaporation rate drops, thus the droplets survival time and time for evaporating completely are extended. The steady gas temperature with droplets collision is higher slightly than that without droplets collision, which indicates that the droplets collision affect the results by using numerical prediction. Against the experimental data, the predicted results with droplets collision are more believable than that without collision. Considering the droplets collision and combination, the change rate of the droplets diameter drops, thus the gas velocity picks up slowly.
The Failure of the Novel Solid MEMS Switch in Multi-Physical Coupling Field
Authors: Liu Fang Yi , Lou Wen Zhong , Wang Ying , Wang Fu Fu
Published: April 2014

The novel solid MEMS switch can improve the performance of the MEMS initiator, which will be more secure and reliable.While the leads of its package are weak under launch environment. Therefore, this paper aims to carry out multi-physical field reliability analysis, by using FEM simulation analysis, which can simulate the real launch environment better and obtain the reliability and potential failure modes of leads in impact, temperature, current coupling field, thus providing theory reference for the design and application of the novel solid MEMS switch.