bluuebunny/crossref_metadata_2025 huggingface dataset:
The Mathematical Model of Simulative Calculation for the Process of Airbag Landing
Authors: He Jian , Ma Ji Sheng , Wu Da Lin
Published: September 2014

Airbag is widely used in heavy equipment dropped field with its efficient cushion performance and low cost. The calculation method used now for the process of airbag landing mainly is simulative calculation: analytical analysis and finite element simulation, but there are less systematic introduction for the mathematical model behind these methods in past papers. This paper mainly does the summary for the mathematical model of vented airbag which is usually used.
The Theory of Green Packaging Design and its Application
Authors: Zhou Fen Fen
Published: September 2014

With the development of science and technology and the progress of human society,We gradually know that survival environment is worsening,the further development of the economy has been restricted.These problems directly affect the reproduction of human civilization,So our country put forward the strategy of sustainable development.The concept of green packaging design is adapted to the demand of the times,in order to explore the application of the green idea in the packaging design.Green packaging design needs to consider packaging materials,this will affect the packaging cost.The 60% ~ 80% of the packaging cost have been confirmed in the product design stage.Green packaging structure design should be considered,the structure of reasonable design of packaging, not only can reduce cost, but also reduce the adverse impact on the environment.When we need to use the least amount of packaging materials,a sphere is the best choice.The height of the cylinder is equal to the radius of 2 times through calculation,Its surface area is smallest.Green packaging, therefore, on the one hand, can avoid the waste of resources,let our design work can be harmonious with our living environment.
Application of Energy-Saving Principle of Mechanical Design in Hydraulic Excavator
Authors: Zhang Wei Bo
Published: September 2014

In the working process of the traditional hydraulic excavator, the potential energy could not be properly applied in the course of boom-down, whereas the boom requires additional kinetic energy to rise, resulting in a waste of energy, heating up the system, reducing the service life of the machine. As a solution to this problem, the paper proposes the balance hydraulic excavator, adhering to the energy-saving principle of mechanical design, on the basis of which, turning the traditional hydraulic excavator’s fixed weight into a sliding weight and fuel tank, meanwhile, connecting the sliding weight fuel tank with the boom fuel tank, which constitutes the machinery - hydraulic hybrid balance system to the effect of saving the system energy, improving the overall stability and reliability.
Global Sensitivity of Random Parameters in Vibration Transfer Path Systems
Authors: Zhao Wei , Zhou Na , Zhang Yi Min
Published: September 2014

Based on the Sobol’ theory, Hamma and Saltelli indicator system, the path parameters were divided into the different subsets for the vibration transfer path systems with random paths in this paper. The object function was constructed and decomposed, thus the global sensitivity based on variances was formed. The first-order and total sensitivities of various parameter subsets were calculated using Monte-Carlo simulation method combined with Latin hypercube sampling technique. Through the analysis example, the way is feasible to analyze the interaction of paths or path parameters in the vibration transfer path systems with uncertainty.
Study on Parameter Identification of Mistuned Blades Based on Static Frequency Test and Finite Element Method
Authors: Zhang Liang , Li Xin
Published: September 2014

With elastic modulus perturbation parameter of blade as mistuned parameter, a parameter identification method of mistuned blades is presented based on static frequency test , bisection method and finite element method. Take mistuned blades of the compressor as an example,the mistuned parameter of blades are identified. The identification results show that this method is high precision and fast speed.
A Kind of New Automatic Lift Pump
Authors: Shen Ke Yu
Published: September 2014

The operational principle and composition of the new automatic lift pump and valve is shown, and concerned formulas are deduced on the basis of the analysis of experimental data.
Analysis on the Mechanics Model of the Electromagnetic Permanent Magnetic Knitting Needle
Authors: Zhang Chi , Wu Xiao Guang , Wang Yi
Published: September 2014

Based on the needle selection principle and requirements for hybrid magnetic type of driving knitting needles, this paper puts forward the mechanical model for the knitting needles of magnetic suspension drive mode. This paper analyzes the force model of the knitting needle by establishing the relationship between the magnetic force and the air gap. It also researches stress and strain for the knitting needle by using the finite element method. All these results will provide guidance for the optimal design of the knitting needle and parameters design of the key components like the needle cylinder and so on, at the same time these results will also provide a theoretical basis for the study of coupling mechanism for the knitting needle.
Optimization of Integral Steering Trapezoid of Commercial Vehicle Based on MATLAB
Authors: Guo Cui Xia , Zhang Hong Zhi
Published: September 2014

The good integrated steering trapezoid of the commercial vehicle can reduce the running resistance, making the steering portability, and reduce tire wear. According to the Ackerman principle, establish the outer wheel theory and practice angle deviation minimum, which is as objective optimization mathematical model. Optimizing two important parameters of the steering trapezoid arm value and the steering trapezoid arrangement angle by the optimization toolbox of MATLAB. After optimization, the value of the actual the inner wheel angle deviation between the theoretical is smaller, so the steering characteristic has been significantly improved.
Pumping Unit Suspension Point Direction Balance Theory Analysis Method and Effect Evaluation
Authors: Yang Hu Kun , Lu Yu , Zhao Xiang Ru , Wang Jian Ping
Published: September 2014

In order to reduce the adverse effect of suspension point dynamic load on pumping unit system, according to the suspension point balance principle of conventional type pumping unit, the suspension point direction balance designing scheme is determined. Take CYJ10-3-37HB pumping unit as research object. Establish the virtual prototype simulation analysis model of conventional pumping unit by suspension point direction balance before and after the balance. Through the contrastive analysis of simulation results, the effect of load reduction and energy saving after the pumping unit by suspension point direction balance is determined. The simulation results show that the reduce rate of pumping unit maximum polished rod load is 29.4%, the reduce rate of RMS torque is 15.8%, the load reduction and energy saving effect of suspension point direction balance is obviously. It laid a theoretical basis for the suspension point direction balance device in engineering practice application.
Research on Working Characteristics of Automatic Vent Valve and Gas Purification Equipment in the Oil Field
Authors: Zhang Jing , Li Yan Gang , Ma Zhao Lin , Zhang Ping , Li Jia Qi
Published: September 2014

The structure and working process of automatic vent valve and gas purification equipment is introduced in this paper. To analyze the flow field in the valve, numerical simulations are also performed in the paper. The results show that the valve can greatly reduce the pressure of products from the oil well and acts very well in the control of the blowout on the wellhead. By using the vent valve and gas purification equipment, the back pressure of the well head can be properly handled, the frozen of the output gas can be avoid when the ambient temperature is extremely low, and the stability and reliability of the well head of the pumping unit can be improved greatly. All these can bring broad allied field for the equipment in our country.
The Calculation and Experiment Based on the Finite Difference Method for the High-Voltage Electrostatic Field of Melting Electron Beam Gun
Authors: Liu Hai Lang , Li Hang , Yu Hai Hua , Huang Yi Ping
Published: September 2014

Aiming at high voltage electrostatic field of melting electron beam gun system, taking 30 kv 60 kw melting electron beam gun for example, the structure of the electric field and boundary conditions was designed. And the mathematical model of the electric field was established. The method of numerical calculation was used to solve the mathematical model, and Matlab software was used to simulate the equipotential lines of the electric field. The electrolytic cell experiment was used to simulate high voltage electrostatic field distribution of the electron beam system. At the same time compared with the two different results, the reasons and the improved method were analyzed. For research and calculation high voltage electrostatic field of processing equipment such as electron beam welding, melting, etc, offers a more general analysis, design and calculation methods.
Strength Design for Star Sprocket Based on ANSYS
Authors: Hong Lin , Li Ying Jie
Published: September 2014

A star sprocket is an important component of U-shaped slide chain conveyor, so it is particularly important to be analyzed. It conducts modal analysis of star sprocket by using large finite element analysis software, ANSYS, calculates natural frequencies of the first five and the corresponding modes and analyzes natural frequency affected by sprocket tooth thickness. The result provides basic theory for dynamic optimization analysis of U-shaped slide chain conveyor.
Study of Truck’s Aerodynamic Drag Reduction Based on Jet
Authors: Guo Peng , Zhang Jun Yuan , Li Qi Fei , Hu Xing Jun
Published: September 2014

Multiple schemes are adapted on truck's outer flow field based on numerical simulation. Comparative analysis with the state of air flow, the pressure distribution, the air movement between the cab and cargo is pursued, then obtain the effect of jet flow velocity to the truck Cd. With the increasing of the jet velocity, Cd increases first and then decreases. The maximum drag reduction can reaches 7.38%.
The Use of Decentralized Ventilation Systems with Heat Recovery in the Historical Buildings of St. Petersburg
Authors: Murgul Vera , Vuksanovic Dusan , Vatin Nikolay , Pukhkal Viktor
Published: September 2014

Historic apartment buildings in Saint-Petersburg no longer meet today’s energy efficiency standards and need upgrading to achieve lower energy-consumption. The possibilities to upgrade old buildings – historic and cultural monuments – are initially limited. A controlled heat recovery ventilation system is considered to be an integral part of energy efficient building. Provided engineering facilities of a building are updated and reequipped energy performance increases without any impact on building exteriors. Different types of decentralized intake and exhaust ventilation systems with heat recovery based on various types of heat exchangers are considered in a detailed way.
Antiknock Performance Comparison Analysis of Refuge Chamber Cabin Based on Different Stiffeners
Authors: Gong Xiao Yan , Xu Jun , Zhang Li , Jiao Wan Ying
Published: September 2014

In order to improve the safety and reliability, and reduce development costs of the refuge chamber cabin, we combined TNT equivalent substitute with numerical simulation method, used software AUTODYN to carry on simulation calculation and obtain coal mine gas blast law and determine explosion shock loading. On this basis, four different refuge chamber cabin structure geometries based on stiffeners were designed , then the ANSYS Workbench platform software was used to perform dynamic simulation and safety comparative analysis for anti-knock properties of four different stiffeners refuge chambers, we obtained a mine refuge chamber structure with low-cost and good performance, which provided some ideas for mine refuge chamber’s research and development.
Reliability and Sensitivity Analysis of Mechanical Structures Based on Dimension Reduction Method
Authors: Zhang Shu Xin , Yu Kai Chao
Published: September 2014

This paper presents a method for probabilistic sensitivity analysis of mechanical components or structural systems subject to random uncertainties in loads, material properties and geometry. The bi-variate dimension reduction method is applied to compute the response moments and their sensitivities with respect to the distribution parameters of basic random variables. Saddlepoint approximations with truncated cumulant generating functions are employed to estimate the probability density functions and cumulative distribution functions of the random responses. The rigorous analytic derivation of the sensitivities of the probability of failure of the systems under consideration with respect to the distribution parameters of basic random variables is derived. Finally, the practicality and efficiency of the proposed method are demonstrated by an application example.
Research on Method of Prediction of Mechanical Equipment Reliability Based on Physical Character
Authors: Wang Qin Qin , Chen Shou Hua , Tang Wei Da
Published: September 2014

Aimed at the characteristic of mechanical equipment, a reliability prediction method based on physical character and stress, load is proposed. The influence of anticipative use environment, abrasion and other potential degenerate cause is considered adequately in this method. The influence of material to the part is also confirmed in this method. in addition, the formula between failure and structure, size, material, craftwork, stress, load is established. At last, taking seals as an example, the process is expounded. A new thought is provided to prediction of mechanical equipment reliability.
Machinery Risk Analysis Application in the System of Employee Training
Authors: Tureková Ivana , Depešová Jana , Bagalová Terézia
Published: September 2014

The area of security affects the entire life cycle of the machine from design, manufacturing, installation, adjustment, maintenance all the way to its disposal. Clearly, the longest as well as the most dangerous stage of the machine, is its own operation and maintenance. At this stage it is necessary to assess the risks associated with its use and possess the documentation so as to use the machine safely. These materials are the basic documentation, which is the subject of familiarization and practical training of the employees rather than immediate use of the machine. This article describes the risk analysis of the machinery and its application to risk management particularly the process of training and educating the employees.
Calculation of Vortex-Induced Resonance on a Thermo Well
Authors: Lei Ming , Ge Jian Gang
Published: September 2014

When vortex-induced resonance happens, the amplitude is big enough to affect the comfort and safety of the structure using, also it can cause fatigue damage to the structure. Being in the tube full of flowing natural gas, the thermo well may vibrate and be damaged. In this paper, based on the theory of vortex-induced vibration, by using ANSYS (FEA software), the author will test and verify whether the vortex-induced resonance will occur on the thermo well according to one example. Keywords: vortex-induced vibration; thermo well; vortex shedding frequency
Risk Assessment of Ship Oil Spills in the Ningbo-Zhoushan Port
Authors: Zhao Ya Peng
Published: September 2014

The accidents of ship oil spill have been one of the most significant factors leading to marine pollution, so appropriate approaches to forecast ship oil spill risk has important significance. Risk assessment of ship oil spills is a complex multi-factor issue, which plays a key role of ship oil-spill emergency response. A novel fuzzy evaluation model for risk assessment of ship oil spill is presented by analyzing historic accident data and expert experience. The model is used to compute comprehensive accident probability of ship oil spill and analyze sensitivity of risk factors so as to evaluate ship oil spill risks quantitatively and find out major risk factors which influedce ship oil spill risk. At last, the presented model is applied to study the ship oil spill risk in Ningbo-zhoushan port, the assessment examples are proved to test the feasibility and reliability of the model.
Risk Assessment for a Main Pipeline under Severe Soil Conditions on Exposure to Seismic Forces
Authors: Muravyeva Liudmila , Vatin Nikolai
Published: September 2014

Main Pipelines of the Russian Federation are critical energy facilities that make a significant contribution to the operation of power industry as a whole. Earthquakes are almost always followed by an increase in the accident rate on pipelines. Therefore, there is a reason to suppose that seismic forces (even minor ones) accelerate failure occurrence in a number of pipeline sections and serve as “the last straw” that causes accidents. The pipelines incur the most severe damage when the route is co directional to the seismic strain vector.
Finite Element Analysis of Mechanics Property on Memory Alloy Patella Claws with Anti-Shearing Force
Authors: Du Dong Peng , Wu Zhe , Xing Juan , Gong Xiao Yan , Miu Xiang Wen , Yuan Cheng Long
Published: September 2014

When strong exercise on human being body, respectively, under knees 30°, 60°,90°, using PRO/E5.0 software to establish the transverse patella fracture and anti-shearing force patella claws 3D models, then the two structure models were assembled and imported into ABAQUS10.1 software to establish the finite element model of patellar fracture fixed within patella claw, and analyzed the mechanical performance in perforce finite element model. Under the same boundary conditions, the maximum displacement and deformation of each components were different at every flexion angle. Compared with anti-shearing force patella claw and AO tensile force girdle, the patella claw with stronger resistance to tension and anti-shearing force was more stable. Deformation and displacement of patella claw in accordance with biomechanical research result that is needed by clinical. Its stability will satisfy clinical requirements for functional exercise.
Generation of the Underdraught Points Uniformly Distributed Contour Tool Path for CNC Incremental Forming
Authors: Zhu Hu , Zhang Wei , Ju Jin
Published: September 2014

Aiming at the problem that indentation was generated on the forming surface due to the concentration of underdraught points on contour tool path, this paper proposed a method that can obtain a series of uniformly-distributed underdraught points on the contour tool path generated based on STL model in sheet metal CNC incremental forming. In this algorithm the STL model was taken as the input model and the cutting plane through the central rotation axis of model was rotated a certain angle in turn to cut the contour tool path, then the underdraught points distributed uniformly along the workpiece contour can be obtained. The case study shows that the proposed method can effectively generate the contour tool path with the underdraught points uniformly distributed.
Modal Analysis of Gear Transmission System Based on ANSYS
Authors: Wang Tao , Xie Chen , Wang Feng , Hu Xiao Rui , Hu Li Ming
Published: September 2014

With the study of a certain servo gear transmission system, a three-dimensional parametric design of servo drive system is made based on SolidWorks and its plug-in GearTrax. The model is introduced into ANSYS through a special interface, and the finite element modal solutionsare obtained. Aiming at solving the practical problem that the static linear modal analysis methods fail to meet the working conditions of high speed rotation and frequent variable speeds, this paper proposes an effective way of determining the range of the system natural frequency through figuring out the natural frequencies in two critical states. Thus, it provides an important basis for the credible design of the servo drive system and a reliable theoretical guidance and reference data for its design, use and maintenance.
The Finite Element Analysis of Lei-Ring Applied to Upright Column for Hydraulic Support
Authors: Li Hai Ning , Li Dan , Xin Xin
Published: September 2014

Abstract:In this paper ,the finite element model of the lei-ring was established in ANSYS software,the sealing performance of hydraulic support column piston was analyzed.Also,the numerical simulation analysis was made of the impact of column working pressure on the sealing performance,and a series of the integrated equivalent stress and contact pressure images of sealing ring when working were got. From those images,the location most prone to failure can be concluded.All of work can provide a theoretical reference for the design and use of drum sealing ring used on hydraulic support upright column.
The Parametric Design of Pulley Based on AutoCAD
Authors: Wang Hong Jun , Wu Hao
Published: September 2014

This design mainly takes pulley as the research object. First collect the data of pulley, bring round the body of the reference point, design the User DCL dialog, then preparing Auto Lisp diver. The procedure involves drawing frame, title bar, shape, tolerance and coarse and so on the surface, generated by the input parameter , you can take the implementation of parts of the system
Typical Workpiece Contour Surface NC Milling Tool Path Determination
Authors: Tian Chun Xia
Published: September 2014

In NC milling tool path reflects all the processing process, the tool path is reasonable or not, related to the workpiece processing quality and production efficiency, through several parts of the typical contour shape analysis, determination method of NC machining tool path, determined by the combination of NC milling tool path, to reduce the surface roughness of the workpiece, improve workpiece processing quality objective.
Intelligent Cutting Tool Selection for Milling Based on STEP-NC Machining Features
Authors: Ouyang Hua Bing
Published: September 2014

A framework of an intelligent tool selection system for milling based on STEP-NC machining features is proposed. The main objective of the research is to develop a procedure for the selection of cutting tools. This will help the planners to select the optimal cutting tools. The proposed system consists of the knowledge base module, the inference engine, the user interface and the database. The implementation of the presented system is developed in Solidworks. An example is given to demonstrate the feasibility and efficiency of the prototype system. As a result, this research shows a high potential to aid the development of tool selection and process planning milling system.
Performance Evaluation of Spring for the Vehicle Suspension System Using the Nonlinear Finite Element Method
Authors: Kim Byeong Soo , Moon Byung Young , Kim Sung Kwan
Published: September 2014

Air spring is used for the suspension system and it affects the vehicle stability and riding comfort by improving the impact-relief, braking, and cornering performance. Air Spring is comprised of the upper plate, lower plate, and rubber sleeve. Rubber sleeve is the composite material, which is made up of combination of rubber and Nylon, and the characteristics are changed according to the shape of rubber-sleeve, the angle of reinforcement cord. In this study, the distribution of internal stresses and the deformation of rubber composite material are analyzed through the nonlinear finite element method. The result showed that the internal maximum stresses and deformations about the changes of cord angle caused the more the Young's modulus decrease, the more maximum stress reduced.
Laboratory Researches of Resistance to a Heat Transfer of an Easy Protecting Design
Authors: Petrosova Daria Vladimirovna , Petrosov Dmitri Vadimovich , Kuzmenko Natalia Mikhailovna
Published: September 2014

Now in Russia construction of buildings with framework use from a metalwork which show itself as universal, strong, easy and fast-built is actively conducted. There are offers and initial experience of application of easy steel protecting designs with an effective heater in multystoried frame residential buildings, but without sufficient theoretical and experimental justification.In this regard, the question of determination of the heatphysical properties, in particular the specified resistance to a heat transfer, is actual.Results of laboratory researches of the specified resistance are presented to a heat transfer of an easy protecting design in article.
A Fast Method of Dynamic Maize-3D-Modeling Based VRML
Authors: Wang Hao Peng , Zhang Jing , Li Xiao Jing
Published: September 2014

Discussed the key process and referenced method of field information quantitative extraction for maize based on L-system-3D dynamic modeling in the process of virtual plants simulative display, presented the method of field information quantitative extraction for plant simulation, and delivered the effective final validation results. The research can be used to serve for virtual plants display based on Virtual Reality Modeling Language effectively.
Build 3D Electronic Map Lama Temple
Authors: Liu Hong Li , Chen Xiao Ying , Zhang Yue , Jiang Yue
Published: September 2014

This article produced virtual reality attractions in Beijing, used in teaching and achieved good results. It conducted in-depth research in framing the attractions, modeling, data compression [1-4]. Based on the reality of a Buddhist temple in Beijing Lama's famous three-dimensional, we constructed a 3D electronic map navigation system.
Research and Application of Cutting Efficiency Optimization Based on VERICUT and UG
Authors: Ruan Xiao Guang , Zhao Rong Rong , Cai An Jiang , Ma Wan Li , Liu Jiang
Published: September 2014

Use the process of dashboard on the solid high-tech 3D numerical control platform of NC machining process as an example, Using UG to establish the machine and parts model, the tool path have been optimized by VERICUT .As a result, enhances the processing speed, shortening the processing time, improve the cutting efficiency, reducing processing cost and making the process has been optimized .Finally, Reliability and optimization results are verified through numerical control platform instance.
3-D NC Testing Platform Based on Motion Control Card
Authors: Yin Hong Mei , Wang Mu Lan , Ye Chang
Published: September 2014

Researched the virtual-actual integrated technology based on the computer simulation test, 3-D NC test platform was mentioned using ′PC+Motion controller′as the core. In the VC++6.0 environment, the MFC series and the GT motion controller dynamic link library was used to realize multi axis linkage control function and 3-D NC control system software was developed. The “” vector control strategy and the SimPowerSystem module library was used to establish the system simulation of PMSM vector control model, Matlab software and InTouch software were used to realize the virtual simulation and associated debugging for control system and mechanical transmission system, the feasibility of numerical control testing platform was verified .
A Device Developed for Soil Shear Strength Measurement
Authors: Xu Yi Wei , Li Qing , Hu Peng , Shentu Nan Ying , Peng Quan Yuan
Published: September 2014

Soil shear strength is an important physical performance of rock and soil, so the soil shear strength measurements play an important role in monitoring and prevention for landslide hazard point. In order to achieve on-site monitoring of landslide hazard points, this article presents a device for field measurement on soil shear strength, The device consists of cross board, torque sensor, stepper motor, single-chip hardware circuit and other components. When measuring,the single chip microcomputer (SCM) control stepper motor to drive the cross board sheared in the soil, through the coaxial plate shear force torque sensor on the cross board to measure the torque signal ,then the torque signals are transmitted to SCM, the SCM for data processing to calculate the soil shear strength.
Advanced ZigBee Routing Strategy of Offshore Wind Monitoring System
Authors: Ma Xia Xia , Su Ling Xia , Lv Shao Dong , Xu Mei , Huang Cong Ying
Published: September 2014

With wind power technology become more mature, offshore wind power generation system development obtains more attention. However, compared to onshore wind energy, offshore wind suffers harsher environment, and its maintenance become more difficult. Therefore,improves the performance of monitoring system of offshore wind power is essential to reduce operating and maintenance costs. This paper designs offshore wind monitoring system based on ZigBee wireless sensor networks aiming to develop more raliable monitoring system. Meanwhile, this study proposed a smart ZigBee routing strategy IZCT algorithm. OPNET simulator was used to simulate the topological features and performance of ZigBee networks. The test result indicates that IZCT algorithm can optimize the routing path of the wireless sensor networks and improve the reliable of the network communication.
Characterization of High-Throughput Capillary-Based Microfluidic Devices for Lab-on-Chip Integrated Optics Detections
Authors: Honrado Carlos , Dong Tao
Published: September 2014

The characterization of novel portable microfluidic devices, with capillary phenomena as filling process, was presented. Created for monitoring multiplexed chemiluminescence (CL) reactions, the devices are amenable for integration with organic photodiodes (OPDs) for future incorporation in microelectromechanical systems (MEMS). Using finite element method (FEM), four designs of microfluidic chips were simulated. The parallel design, despite its quick total filling time (TFT), presented a non-uniform filling process and a non-compact structure. The series design was the most compact structure studied. However, it cannot be used in CL reactions with multiple analytes in common, which is a major drawback. Regarding the parallel-series, it solved some of the problems presented in previous designs but its high TFT and non-compactness make it a less attractive solution for a portable microfluidic device. Finally, the optimized parallel design proved to be the best design, presenting a quick TFT, high compactness and the capability to have CL reactions sharing analytes.
Combined Forecast of Calibration Interval Based on Linear Trend Model and Neural Network
Authors: Chen Zhen Lin , Zhao Fang , Zhang Xiao
Published: September 2014

For realizing the dynamic optimization of measuring instrument calibration interval, predicting the history calibration data by modeling. First the improved moving average method is used to modeling and to predict the development trend of parameters. On the basis of this, BP network is used to compensate the predicted residual sequence, so as to get more accurate forecasts. Then improved MA - BP prediction model is given to optimize the calibration interval dynamically. The model is verified through experiments. The results show that the model has higher prediction precision and better universality.
Development of GIS Partial Discharge Detection System Based on the New UHF Sensor Combination of Switchgear
Authors: Chen Bo
Published: September 2014

In order to ensure power supply reliability and reduce a variety of power supply failure, we analyze the development status, advantages and disadvantages of partial discharge detection techniques about the various Gas -insulated Metal-enclosed Swith Gear (GIS). We put forward the application of ultra high frequency (UHF) technology for GIS partial discharge online monitoring technology methods to solve the problems of the difference of the pulse current method of anti-interference ability and ultrasonic sensitivity the problem of low. According to the deficiency of the traditional ultra high frequency sensor, we developed a new window type of ultra high frequency sensor, and compared with conventional in vitro type UHF sensor. Experimental results show that that the window-type UHF sensor sensitivity and anti-jamming capability are superior to conventional high-frequency sensor
Elasto-Optic Constant of PMMA Measurement Using Linear-Least Squares Method
Authors: Zhang Rui
Published: September 2014

Elasto-optic constant is an important parameter for stress measurement by digital gradient sensing method (DGS). In this paper, Elasto-optic constant is measured using an edge-cracked three-point bending specimen. Elasto-optic constant is related to known stress intensity factors and specimen thickness. The full-field angular deflections around the crack-tip are measured using DGS. And then Elasto-optic constant were calculated from the experimental data by linear-least squares method.
Experimental the New Fuel Selector Valve Control Box Automatically Checks Instrument Research and Design
Authors: Huang Yang , Tian Ling
Published: September 2014

The new oil supply valve control box automatic tester is based on the C8051F040 micro controller, through the provision of analog signal and valve position signal to the control box, collection and judgment output control box, to realize the automatic test control box performance. The design has the advantages of friendly interface, simple operation,reliable performance etc. The result shows that it can greatly improve the efficiency and reliability of the control box to check.
Measuring Limitation Analysis of Six-Axis Wrist Force Sensor Based on Screw Theory
Authors: Wang Zhi Jun , Liu Wan Yu , He Jing , Xian Li Zhan , Zhao Yong Sheng
Published: September 2014

When robot do contact operation task to unknown environment, it often need wrist force sensor to check contact force information between robot and environment then judge the contact state, and check the information feedback to control system for completing operation smoothly. This paper analyze the measure theory of robot end wrist six-axis force sensor based on screw theory, propose and verify the limitation of six-axis wrist force sensor for measuring the six-dimensional force online.
Method Design and Failure Analysis of the Penetration Test on Seamless Gas Cylinders
Authors: Yuan Yi Wen , Wu Hao Hong , Yang Chong Wei
Published: September 2014

Requirements of the penetration test on various seamless gas cylinders are analyzed to determine the specific method of the penetration test on different types of gas cylinders. The actual penetration test on the cylinder for on-board storage of fuel for automotive vehicle is taken for example to make a comparison with the design method and validate correctness and reliability of the designed test methods; corresponding failure fracture is analyzed through a scanning electron microscope to validate the affect of the penetration test on safety performance of the seamless gas cylinder and predict the possible results under actual working conditions.
Monitor Method of Offshore Wind Turbine Based on Memory-Like and Neural Network Expert System
Authors: Su Ling Xia , Ma Xia Xia
Published: September 2014

The number of offshore wind farms increases gradually because of the high capability of power generation. However, the costs of manufacturing, logistics, installation and maintenance of offshore wind turbine are higher than those of onshore wind turbine. Thus the introduction of fault diagnosis is considered as a suitable way to improve reliability of wind turbine and reduce costs of repairs and casualties. In this paper, 3 major failures of direct-driven wind turbine according to urgency and system responses are discussed. A "memory-like" model pretreatment method and a fault diagnosis method for the failures are investigated. The simulation results show that total amount of fault data to be processed and stored is reduced, and difficulties of knowledge gaining and fault reasoning are also decreased.
Non-Destructive Measurement of Doublet Objective Lens Structure Parameters Based on ZEMAX
Authors: Bian Xin , Huang Feng , Cao Guo Rong , Wang Zheng Ling
Published: September 2014

A method for structure parameters of doublet objective lens with non-destructive measurement is proposed based on the ZEMAX software. The focal length, back focal length, central thickness and the radius of curvature of the first surface and last surface are measured by a spherical interferometer and other instruments. Using the inversion of the evaluation function and optimizing of the ZEMAX, the series of refractive index of the materials and the cemented surface of the doublet objective lens are derived. Then the optimal combination of the glass materials is selected by the aberration tolerances of the doublet objective lens. The examples show that the result is satisfactory.
Research of CBR-Based Organizations on Aromourd Equipment Fault-Diagnosis
Authors: Li Hao , Zhang Yao Hui , Zheng Yi , Li Lin Hong
Published: September 2014

It is the complex structure of the armoured equipment that determines the traditional organizations of the case-warehouse cannot direct the case-based reasoning effectively. Adopting the way to analyse failure mode before the case-warehouse organizations, suming up for the classification. Building the apart index mechanism and establishing the basis of the effective organizations of the case-warehouse at last.
Research of Two-Dimensional Airflow Angular Velocity Sensor
Authors: Piao L.H. , Yang Qi Rui , Zhao J.J.
Published: September 2014

Proposed a two-dimensional air-angular velocity sensor. Dual vertical heat resistance wire, two-dimensional angular velocity sensitive; By simply supported edge piezoelectric pump support to improve the sensitivity of the sensor; Using stacked sheet round table groove type nozzle, improved stability and repeatability of the sensor; Using software compensation processing to improve the temperature performance and linearity of the sensor. Experimental results show that the sensitivity of the sensor improve nearly double, Zero variation decrease from≤10% to≤0.2%, operating temperature extended from-10°C~+40°C to-45°C~+65°C, linearity decrease from≤1% to ≤0.5%, the amount of sensitivity decrease from ≤10% to≤0.6%.
Research on Structure of the Airflow Level Posture Sensor
Authors: Piao L.H. , Yang Qi Rui , Zhao J.J.
Published: September 2014

In this paper, three wire structure of the airflow level posture sensor is described. Using ANSYS-FLOTRAN CFD program, the temperature field and the stream field in sensing element of three wire structure and two wire structure under the effect of the different tilt state, has been obtained by a series of procedure, such as model building, meshing, loads applying and equation solving. The results are as follow: In tilt status, the airflow rate difference of three wire structure is nearly five times bigger than two wire structure in the two heat sources. Three wire structure makes heating wire separated from detection wire, solves the contradiction between operating current and output sensitivity, and decrease operating current. The test results show: The compare between three wire structure of the airflow level posture sensor and two wire structure of the airflow level posture sensor is that the sensitivity increases from 10 mV /° to 18mV/°,response time decreases from 100mS to 40mS,operating current decreases from 80mA to 40mA, so three wire structure is better than two wire structure.
Research on Vibration Effect of Ultraprecise Optical Encoder for Micro/Nano Measurement
Authors: Wang Han , Wei Qing Hai , Chen Xin , Chen Xin Du , Fan Chao Long , Chen Bin
Published: September 2014

Optical encoders have been used for decades as displacement measuring devices. As far as image measurement is concerned, CCD and CMOS are gradually used in metrology fields. In practice, performance of image ultraprecise optical encoders are related to environmental temperature, humidity, data processor speed, and vibration, thus measurement precision of encoders will be affected, and these factors limit their usage scale. Among these factors, the vibration is the largest effect factor. Here, a new experiment system was built to study vibration effect of measurement. Experiments indicated that the effects of vibration mainly exist in two aspects. Firstly, vibration induced deformation of glass grating, so distance of adjacent grating lines got uncertain. Secondly, random vibration affected CMOS image sharpness, and it reduced accuracy of encoding and decoding. Finally, some methods are provided to reduce the vibration of the grating encoder.
Space Measurement System Design and Space Environment Adaptation Experiment of Commercial Sensor DS18B20
Authors: Xu Zhi Ming , Liu Peng , Chang Xin Ya
Published: September 2014

In order to solve the problem of the complexity satellite temperature acquisition network cabling connectivity, diversity in temperature acquisition circuits, low temperature acquisition accuracy, complicated computation of temperature formula and so on. A single bus thermometry technology based on 1-wire commercial temperature measurement sensor DS18B20 instead of the conventional thermometry technology on the satellite was proposed. In the study, the space measurement system based on DS18B20 including the design of measurement temperature circuit, software and reliability was designed, and space environment adaptability experiment system was built to study on the temperature measurement performance and spatial adaptation of the commercial sensor DS18B20 in the space environment. The results show that commercial temperature measurement sensor DS18B20 is accurate in a vacuum environment at-50~100°C; the new temperature measurement circuit design makes the temperature collection network cabling easier, and makes solving formula simpler by directly reading the temperature value.
Study of the Gas Pendulum Characteristic of Enclosure with Small Size
Authors: Piao L.H. , Yang Qi Rui , Zhao J.J.
Published: September 2014

The flow and temperature fields caused by point heat source were obtained with the method of FEA (finite element analysis), and the pendulum characteristic of nature convection gas in two-dimensional enclosure with small size was validated and explained. The results are as follow: (1) Whether in horizontal status or in tilting status, under the function of buoyancy lift, the direction of nature convection gas always keeps vertical upwards in two-dimensional enclosure, and it has the pendulum characteristic.(2)The temperatures of two points on the same isotherm are no longer equal. When the tilt angle is 10°, the temperature difference is 20K; when the tilt angle is 20°, the temperature difference is 40K.The tilt angle can be measured by using this characteristic of MEMS airflow level posture sensor.
The Design of Laser Wavelength Measuring System Based on DSP
Authors: Li Zheng Yan , Li Juan Juan , Guo Gang , Yang Dong Ping
Published: September 2014

The main factors influencing the output wavelength of semiconductor are drift of working temperature and changes of working current. Therefore, the key technology of semiconductor frequency stabilization is to detect frequency shifts and convert the shifts into electrical signal, then feedback control the working current and the temperature in order to ensure that the output frequency basically remains unchanged. So, a laser wavelength measuring system based on DSP is designed in this paper. The measurement theory of the system and the design of hardware are given in this paper. The system is composed of DSP, optical grating, CCD and so on. This measurement method introduced in this paper makes the measurement intelligent and has high degree of accuracy of measurement.
The Method of Inter-Well Remaining Oil Detection
Authors: Wu Yao , Mao Jian Lin , Dang Bo
Published: September 2014

Due to the oil field has been mined production for a long period of time, strata for direct production of crude oil quantity is less and less, and the remaining oil exploitation is the key to improve recovery factor. Study on the method of inter well remaining oil detection theory and technology has become the hot spot. Residual oil mostly existed between casing, whole space model is established, the two radius of 0.1 m and wall thickness of 0.01 m casing place in medium of the whole space, using the casing’s high conductivity characteristics, through calculation and analysis on steady-state solver, get the current density distribution curve of casing in cross section. Research results show that the analysis of inter well reservoir and cross-hole no reservoir at the time of the current density distribution, as well as the current density values, theory and method for inter well remaining oil research to provide certain theoretical support.
Time Delay Estimation in Reverberant Environment Based on Acoustic Pyrometry
Authors: Zhang Shi Ping , Shen Guo Qing , An Lian Suo
Published: September 2014

The acoustic thermometry has many advantages, compared with conventional methods of temperature measurements. For this technology, the sound field in normal temperature state of the boiler was simulated; acoustic source signal obtained the pseudo random sequence signal and time delay estimation selected the weighted cross-correlation method. Experiments show that when the boiler is not running, the sound field is enclosure sound field in the furnace. The weighted cross-correlation method can restrain the reverberation and obtain the accurate time delay estimation.
Ground-Based Videometric Method and System for the Real-Time Measurement of Aircraft Landing Track
Authors: Zhou Xiang , Lei Zhi Hui , Fu Dan , Zhang Xiao Hu
Published: September 2014

This paper proposes a ground-based videometric method and system for measuring the glide track of landing aircraft in real time. The proposed method is applicable for large-scale measurement via regional relays with multiple cameras. Its measurement ranges from kilometers away to the landing point, and it simultaneously fulfills the real-time measurement of the position and trajectory of aircraft. The real-time measurement result of the actual aircraft landing process shows a deviation from DGPS(Difference Global Positioning System) as small as 20 cm in the measuring region of 1 km. The proposed measurement method for aircraft landing track based on videometrics can establish a new type of landing aid system removed from radar and GPS.
Measurement of Geometric Parameters for Cutting Tools Based on MATLAB
Authors: Xiao Lu , Teng Yang Yi
Published: September 2014

In this paper, the MATLAB image processing technology has been adopted to obtain the contour of a turning tool with arc blade by binarization of the image, median filter as well as detection of the edge. Then curve-fitting method have been used to fit the contour of straight edge and arc-edge respectively. Finally, the nose angle of the cutter and the arc radius of the turning tool have been obtained by the analysis of fitting results of slope for straight edge and curvature radius for arc-edge. It is shown that the measurement of geometric parameters for cutting tools based on MATLAB not only has small measurement errors and high measurement efficiency, but also can be widely used to obtain tiny geometry parameters for tools with high precision.
The Monitoring and Fault Diagnosis System for Controllable Pitch Propeller Based on LabVIEW
Authors: Yin Bing Kuan , Hu Hai Gang , Zhou Xin , Zhang Lin Wei
Published: September 2014

The monitoring and fault diagnosis system for controllable pitch propeller is based on modern testing technology, fieldbus technology, monitoring and diagnosis technology, computer technology. The equipment consists of various types of sensors, CANopen bus devices, LabVIEW and computer, which can monitor the CPP’s operating parameters, including shaft system vibration, shaft speed, pitch angle, liquid level of gravity tank, pressure and temperature of hydraulic system, and the system can also alarm if three typical fault of shafting occurs.