bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation for Temperature Variability of the Stable Transported Hot Oil Pipeline
Authors: Pei Gui Hong , Han Dong Xu , Leng Jing
Published: April 2012

This paper introduces the physical model and the mathematical model for the submarine oil pipeline during shutdown time, and establish the heat transfer model for the shutdown time of submarine oil pipeline by using the software COMSOL Multiphysics. The permissive shutdown time for pipes of different diameters is calculated in specific case and the diameter-permissive shutdown time curve for the working condition is obtained, thus, provides theoretical support for rush repair which is required when pipe is forced to stop transmission as well as engineering design and safe operations. At the same time, this paper provides reference for the relationship between other factors and permissive shutdown time.
Research on NC Relieving of Annular Worm Gear Hob
Authors: Hao Jian Jun , Ge Shuai Shuai , Zou Xi Hong , Cheng Chang
Published: April 2012

Aiming at relieving processing of annular hob, a applicable method—circumferential relieving method is proposed, this paper describes the principle of relieving processing and implementation method, also proposes a method of computer control, the device which could be mounted on the worktable of hobbing machine to realize circumferential relieving The results showed that method and device proposed in the paper are practicable.
The Influence of Projectile Structure on the Trajectory Stability of Oblique Penetration Concrete
Authors: Li Wei Bing , Feng Cheng Liang , He Yong , Wang Jiang Bo , Chen Chuang
Published: April 2012

In order to study the influence of projectile structure on the trajectory stability of oblique penetration concrete, this paper designs five kinds of projectile structure including cylinder, stern, tapered tail, cone with 4° and 7°, using LS-DYNA simulation software, the process of five kinds of projectile structure penetration into concrete is studied. Through the analysis of projectile axial resistance, projectile lateral displacement, deflection angle of penetration process and trajectory, it is obtained that the terminal trajectory stability of different projectile structures, from optimal to worse, they are tapered tail, cone, stern and cylinder. It also obtains the projectile lateral displacement and deflection angle of penetration process gradually increase with the increase of oblique angle.
Fabrication and Characterization of Transparent Conducting ZnO: Al Films for Organic Optoelectronic Devices
Authors: Zhong Zhi You , Zhou J. , Gu J.H. , He X. , Hou J. , Yang C.Y.
Published: April 2012

Al-doped ZnO (ZnO:Al) thin films were deposited on glass substrates by rf magnetron sputtering technique. The effect of discharge power on the structural, optical and electrical characteristics of ZnO:Al films was investigated by X-ray diffraction (XRD), four-probe meter and optical transmission spectroscopy. The results show that the films are polycrystalline with a hexagonal wurtzite structure and preferentially oriented in the (002) crystallographic direction. The highest figure of merit of 5.58×10-3 -1 is obtained from the film prepared at the discharge power of 200 W. The average optical transmittance in the visible range of the films is over 78.2%.
Properties of Indium Tin Oxide Films Prepared by RF Magnetron Sputtering at Different Substrate Temperatures
Authors: Zhong Z.Y. , Gu J.H. , He X. , Yang C.Y. , Hou J.
Published: April 2012

Indium tin oxide (ITO) thin films were deposited by RF magnetron sputtering on glass substrates employing a sintered ceramic target. The influence of substrate temperature on the structural, compositional, optical and electrical properties of the thin films were investigated by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), spectrophotometer and four-point probes. All the ITO thin films show a polycrystalline indium oxide structure and have a preferred orientation along the (222) direction. The substrate temperature significantly affects the crystal structure and optoelectrical properties of the thin films. With the increment of substrate temperature, the electrical resistivity of the deposited films decreases, the crystallite dimension, optical bandgap and average transmittance in the visible region increase. The ITO thin film deposited at substrate temperature of 200 °C possesses the best synthetic optoelectrical properties, with the highest transmittance, the lowest resistivity and the highest figure of merit.
Study on Floatability and Separation of High Ash and Difficult Floatable Coal
Authors: Chen Gan , Ma Li Qiang , Ii Ji Hui , Yue Zeng Chuan , Xue Xian Ming
Published: April 2012

According to the actual demand of scare coal resources in our country, there is a vital significance in the study on strengthening separated process of high ash and difficult floatable coal. In terms of the limitations and deficiencies of process intensification and flotation efficiency at home and abroad, by means of experimental and analytical approaches, the surface properties of scarce coal slime separation process and process intensification were focused on in this paper. The association between mineral dissemination and variation during flotation process was also focused on. The superficial properties of difficult floatable coal slurry and the existing problems of the traditional reagents in the separating process of difficult floatable coal were analyzed. The reagents dosages suitable for coal slime with high ash were proposed. In the process, kerosene and octanol were respectively taken as collector and frother. The conclusions were obtained that kerosene dosage was 320g/t, Octanol dosage was 110g/t, flotation concentration was 100g/L, and inflation volume was 0.37m3/m2•min.
The Color Recognition of Jet Fuel Silver Corrosion Images Based on Color Difference Formula
Authors: Tong Li Ping , Peng Bin , Fei Yi Wei
Published: April 2012

This article introduces the basic theoretical knowledge of the multi-color space and its color difference formula. By research and experiment, it validates that HSV and CIE L * a * b * color space and its corresponding color difference formula, which are used in the color recognition of jet fuel silver corrosion image, and their results are mostly in accordance with the recognition results by the naked eyes. And it also proves the feasibility of these two methods for the color recognition of jet fuel silver corrosion. Silver strip corrosion experiment must be tested as one of jet fuel corrosion detection items in jet fuel accepting, providing and storage process. The examination, whether jet fuel is qualified or not, is mainly due to silver corrosion’s color judgment. For computer visual system, the color is the character of object surface, and it is mankind recognition system to the object surface, light shine and visual condition’s comprehensive effect, and it has important function in the picture’s partition and identifying field. The color that is put up by visible light is continuous, and in order to measure and calculate conveniently, some scholars successively establish more than ten color spaces, which are mainly divided three types, by the HSV color space with RGB, HIS, and Munsell color spaces etc. According to particular application color space, YUV and YIQ and CMY color space are adopted by the television system, and CIE color space then includes CIE, XYZ, Lab and Luv etc. This article comparatively studies representative color space as well as RGB, HIS, CMY, YUV and CIE Lab color spaces, which are used for jet fuel silver strip corrosion image’s color recognition accuracy, and this article finally ensures a kind of color space and color difference formula which are applied to jet fuel silver strip corrosion image’s color recognition.
The Using of Insulated Fiber Bragg Grating Temperature Sensor in 35kV Switch Cabinet
Authors: Chen Yanr Feng , Li Chuan , Xu Yun Shui , Yan Qing Hua , Zhang Shao Quan , Chen Yan , Xu Xiao Ping , Xu Jiang Chun , Li Ying Na
Published: April 2012

In long-period running of switch cabinet, the temperature of contact points will be rose by the big contact resistance, poor contact and longtime overloading. Overheat can cause oxidation of contact points and the increasing of contact resistance, and then the contact may be generated the spark and arc discharge. That is a bad circle. So the temperature of contact points can affect the reliability of switch cabinet. For detecting the temperature of contacts and the switch cabinet’s environment in Yanjin transformer substation, we design an Insulated FBG temperature sensor. The surveys of upper reaches indicate that the temperature of moving contact A gets the maximum 32.98°C Aug.20, 2011, the temperature of stationary contact A gets the minimum 5.75°C, and the change temperature between contacts and environment gets the maximum 2.82°C. According to relevant state regulations, the contact’s temperature of 70 °C and temperature’s changes of 35 °C in the case of environment’s temperature below 40°C are Alarm threshold value of switch cabinet.
Thermal Response Analysis and FE Modeling of Weapon
Authors: Zhao Yan Jun , Li Xin Jun , Wu Yong Hai , Xu Cheng
Published: April 2012

Thermal is a important factor that affect weapon firing accuracy and security in the process of weapon fire, so thermal analysis of weapon has important meaning . Aim at researched Weapon, the finite element model of the gun body was built, the temperature field of the gun body was calculated by FEM. The effects of temperature of the gun body on firer and aiming mechanism were also studied. Current research work will be helpful the weapon design
Looking Green Manufacturing Processes in the Machinery Manufacturing
Authors: Liu Juan
Published: April 2012

In this paper, there are many system analysis and Summary about the green manufacturing processes, the development of profiles in machinery manufacturing, and prospects about the future research of the green manufacturing process.In real terms, green manufacturing processes in the mechanical manufacturing process is a series of decision-making process, which is important about the clear decision-making objectives of this paper, based on existing research of green manufacturing, this paper summed up the target system and decision-making model of the green manufacturing processes in the machinery.The exact division of the decision-making goal and the proper establishment of the decision model has important implications for the future of green manufacturing.
The Correction of Face Gear Tooth Flank Deviation
Authors: Zhao Ning , Hou Sheng Wen , Guo Hui , Gao Hao
Published: April 2012

A orthogonal-shaft face gear drive with spur involute pinion is considered. The mathematical model of the face gear tooth flank was studied and the correction parameters was taken into account. The measurement grid schema was accomplished on the rotary projection of theoretical tooth flank, with the real tooth flank data from three-dimensional measuring machine or gear measuring center, the tooth flank deviation could be calculated. The effect of correction parameters on tooth flank deviation was investigated and the correction method for the single index generating grinding was proposed. Finally a numerical example was presented and the results show that the method proposed can decrease the tooth flank deviation.
Lasing Action in Dual-Doped Organic Microcavity with Cascade Energy Transfer
Authors: Zhao Xuan Ke , Zhao Qing Wu , Shen Xiao Fang
Published: April 2012

In this paper, we studied lasing action in dual-doped organic microcavity with cascade Forster energy transfer between polymer and two fluorescent dyes in surface emitting microcavities, which formed by sandwiching a poly(N-vinylcarzole) (PVK) film doped with 8-trishydroxyquinoline (Alq3) and 4-(dicyanomethylene)-2-tert-butyl-6 (1, 1, 7, 7-tet ramethyljulolidyl-9-enyl)-4H–pyran (DCJTB) between a distributed Bragg reflector (DBR) and a silver film mirror. The sample was optically pumped by a frequency-tripled Nd:YAG laser delivering 5.55ns pulses at 355nm with a 10Hz repetition rate. By optimizing the concentrations of Alq3 and DCJTB in PVK, a low lasing threshold of about 9.5µJ per pulse attributed to efficient cascade Forster energy transfer form PVK and Alq3 to DCJTB was obtained. The full width at half maximum (FWHM) of the emission was about 2nm with the peak wavelength at 628nm. Our results demonstrate that the PVK:Alq3:DCJTB could be a promising candidate as gain medium for red organic diode lasers.
Experimental Study the Vibro-Acoustic Performance of a Double Glazed Window
Authors: Mao Qi Bo
Published: April 2012

This paper presents an experimental investigation of the sound transmission and structural vibration characteristics of the double glazed window. The laboratory experiments were performed placing the window between reverberation chamber and anechoic chamber. The window was subject to diffuse field, approximate normal wave and oblique wave acoustic excitations. The sound transmission performances at far-field were measured. Furthermore, experimental modal analysis has been performed. The Least square complex exponential algorithm is used to extract the modal parameters, i.e. mode shapes, natural frequencies and modal damping ratio of the structure. The results also show that the highest sound transmission of this experimental double glazed window appears around the mass-air-mass resonance frequency.
Torque Calibration Device for Hydraulic Tubing Tongs and its Experiment
Authors: Zhang Fu Xiang , Li Yuan Bin , Yang Xiang Tong , Dou Yi Hua
Published: April 2012

Because of big error of torque measured by hydraulic tubing tongs, tubing connections may be over or less engaged, which will result in leakage of tubing connection and abnormal annular casing pressure. The primary reason of big error was that systematic error couldn’t be verified because of indirect of hydraulic tubing tongs. To solve this problem, 10000N.m and 15000N.m hydraulic tubing tongs were designed and manufactured. The devices have received two national patents and accredited by authority of the State Department. Experimental procedures and regulations were developed. It was found that hydraulic tubing tongs worked in a stable situation and values recorded by hydraulic tubing tongs were more accurate
Study on Key Factors of Numerical Simulation on Automotive Panel Forming
Authors: Wang Qiang
Published: April 2012

In this paper, for improving simulative accuracy of auto panel forming, some key factors of numerical simulation with finite element method on automobile panel stamping forming are researched. These key factors include finite element algorithm, adaptive mesh, element type and element formulation, hourglass control, material model, and so on. Through simulation example and analysis show that the dynamic explicit algorithm is suitable for metal stamping forming and the static implicit algorithm for springback stage, the adaptive mesh must be adopted in sheet blank forming, element should be selected shell elements, material model should be selected Barlat’s 3-parameter plasticity model.
Studies on Prediction Method of Multi-Transform Domains and Non-Linear Fault Trend Oriented to Wind Turbine
Authors: Xu Xiao Li , Jiang Zhang Lei , Zuo Yun Bo
Published: April 2012

Chinese wind power industry is in the ascendant. The hidden fault development trend prediction technology will become increasingly important for improving the efficiency of wind turbines. Faced to the changing condition and non-stationary character of equipment, this paper proposed a data-based multi-transform domains non-linear fault trend prediction technique. The mechanical systems physical information and failure prediction value information was integrated in this technique. Multi-transform domains and non-linear dimensionality reduction method used to analysis equipment working state and extract failure feature of topology domain. This technique try to solve the problem that fault development information is often flooded by irregular state change information.
Design of 20m3 Liquefied Petroleum Gas Tank
Authors: Liu Jian Hua
Published: April 2012

According to GB150-1998, the standard of steel pressure vessel, determination method on design pressure and design temperature, material selection, tanks and the head design method and opening reinforcement calculation method was introduced. Running effects were in excellent condition after a few years of use. The design method of liquefied petroleum gas tanks was introduced in this paper had a guiding role on liquefied petroleum gas tank.
Comparative Study of Two Kinds of Test Methods of Marine Outboard Engine Crankshaft Bending Fatigue Reliability
Authors: Wang Zi Wen , Yu Quan Yu
Published: April 2012

The bending fatigue reliability test of marine outboard engine crankshaft is the most important and most intuitive way of evaluating the strength and reliability of crankshaft. This paper, through the analysis of the methods of mechanical vibration and electric resonance, gets the working principles and characteristics of these two kinds of test methods. In addition, it plays a positive role in the theoretical study of the crankshaft reliability test methods and in the improvements of their products’ reliability level.
Design of High Precision Multi-Channel Synchronizer Signal Generator
Authors: Chang Li Min , Zhang Qing Guo , Lv Xue Yan
Published: April 2012

According to the characteristic of synchronizer signal, multi-channel synchronizer signal generator is designed based on USB and C8051F340. Software implementation is given using Aitken interpolation algorithm. It greatly reduces the cost of development and effectively improves the precision. Meanwhile, using the USBXPress development kit for PC and firmware development shortens the development cycle. Compared with the special numeric synchronizer converter, the price of designed Synchronizer signal generator cheap 100 times, the full range error less than 0.04º and the accuracy improved 25 times. At the same time, it has work stability, strong anti-interference and high practical value.
A Simulation Method of Three-Dimensional Shape Measurement System Based on Texture Mapping and Ray-Tracing Algorithm
Authors: Zhang Ding , Zhang Ying Jie , Yu Ming Rang
Published: April 2012

Based on the theories of texture mapping in the Photorealistic Graphics and ray-tracing algorithm, this paper proposes a novel method to simulate the real three-dimensional shape measurement system by projecting a sinusoidal stripe texture on computer 3D models, which are generated by the ray-tracing algorithm. The sizes of the main error sources of the real measurement system can be determined by comparing the real measurement result and the simulation one when measuring a standard block, higher accuracy of the simulation system are achieved by adding these error sources, then the source of the errors in the measured object can be achieved in the same way.
An Eddy Current Sensor Array to Detect Defects on a Metal Surface
Authors: Yu Chun He , Jiang Xiao Bo , Zhang Dan Ping
Published: April 2012

In order to detect the surface defects of metal work piece, a sensor array is designed based on the principle of eddy current detection. According to the difference of frequency in LC oscillatory circuit, the information of the metal work piece can be obtained. In order to acquire a stable result, an algorithm is proposed to eliminate the transient disturbance and to reduce the influence of temperature drift. With the embedded system of arm7 kernel, the result of data can be displayed in graphical format. The experiment shows that the sensor array has soundness and operability.
Control Strategy of Coiling Tension Based on RBF-NN Inverse System
Authors: Duan Chao Wei , Zhang Chao
Published: April 2012

Based on the study of coiler tension indirect control process, the purpose is to improve the control accuracy of the constant tension by the introduction of RBF neural networks and inverse system control theory. Depending on the physical characteristic of coiling tension control process, it could build the inverse system model for coiling tension control. By analyzing simulation results, this control strategy has great significance to the actual production.
A New Method for Measuring the Thickness of Tin Coating Layer on the Mobile Phone Case
Authors: Li Gui Yun , Shen Xiao Bin , Li Rui
Published: April 2012

The Tin coating thickness has significant influence on the quality of the mobile phone case product. It is very difficult to obtain the Tin coating thickness using conventional testing method. This paper proposes a new technique for efficient and accurate measuring the Tin thickness plated on the surface of mobile phone case products through analyzing the section image of the product derived from SEM. A computer image analysis has been carried out to obtain the thickness of the Tin coating. In the paper, we describe the detailed sample preparing processes which involve the use of rubber container, clamp, PS resin, firming agent, polishing machine, 3000 mesh sanding paper, silk, SEM and other tooling, scanning the sample section with SEM to obtain the image in computer and analyzing the image in the computer. This new method is very efficient and quite accurate, thus can be used in the production line to monitor the Tin coating thickness to help control the product quality.
Three-Dimensional Numerical Computation for Temperature Field and Insulator of Cold Regions Tunnel
Authors: Lai Jin Xing , Liu Chi , Zhang Guang Long
Published: April 2012

With heat conduction differential equation of the transient temperature field, Galerkin method is adopted to deduce the three-dimensional finite element formula; based on the test result of temperature field, the actual temperature of the environment inside the tunnel shall be exerted on surface of the second lining concrete as load, thus establish the three dimensional computation model of the temperature field of tunnel in cold region. Next, on basis of the model, numerical analysis on cross section of burial depth and longitudinal direction of tunnel in cold region with and without thermal insulating layer, so as to provide theoretical basis for thickness and longitudinal length of thermal insulating layer laid in tunnel of cold region.
Design of a New Fault Detection System for Auto-Loader
Authors: Zhang Zhen Shan , Li Pei Fu , Huang Jing Jing , Li Ting
Published: April 2012

Aimed at the problems of that present fault detection system for Auto-Loader can’t adapt the need of maintenance and support under field conditions, a set of portable intelligent fault detection was developed. On the basis of deeply analyzing Auto-Loader’s sequence control circuit and operating principle, the system overall design plan was built up; circuit of the power, data acquisition circuit, mutual interface circuit and other hardware were designed, anti-interference technology was studied; Data analysis software of upper computer system was developed by Visual Basic, the interface was used and studied briefly, suitable for every level’s technical staff. The example of fault detection of Auto-Loader’s program control box has indicated that detecting instrument was practical.
Design of Active Structural Acoustic Control System Using Volume Displacement Sensors and Uniform Force Actuators
Authors: Mao Qi Bo , Zhang Wei
Published: April 2012

With an example of simply supported beam, it is presented a new volume displacement sensor and uniform force actuator design method to active control of structure-borne sound. An array of rectangular segments of PVDF film and PZT attached on the front and back surface of the beam are taken as sensor and actuator respectively. The output signals of the PVDF films are multiplied by appropriate weights so that the weighted combinations of the outputs directly lead to the volume displacement of the beam. The input control of each PZT actuator is driven by the same control input voltage but with different appropriate weights so that PZT array generates a uniform force over the beam. Finally, optimal control simulations are performed to validate this sensor/actuator strategy
Discussion of Problems of Measurement Carbon on the Inner Surface of Inner Grooved Copper Tube by Infrared Absorption Method
Authors: Yuan Huai Bao , Li Yue Hong
Published: April 2012

The inner surface carbon in the inner grooved copper tube was determined by tube furnace heating-infrared absorption method. Some factors which influenced the determination such as sample preparation and cleaning, flow rate, furnace constants, blank value, calibration constant were tested and optimized. The inner surface carbon of copper tube was released completely while the experiment temperature was chosen as 400~600°C and the flow rate of oxygen was 750 mL/min. And the obtained integral calculus curve was ideal. The method has been applied to the determination of inner surface carbon in the inner grooved copper tube with carbon content of 0.24 mg/dm2. The result of the RSD was 3.7％. And the recovery experiment through joining in synthesize carbon sample was carried on, the recovery was 98～103%.
Double Closed-Loop Controller Design of Brushless DC Torque Motor Based on RBF Neural Network
Authors: Li Deng Hua , Chen Zhan Xian , Zhai Shuang
Published: April 2012

For the problem of that the traditional brushless DC torque motor controller position servo system is difficult to track accurately the complex and varied location information, an improved double closed-loop controller is designed in this paper. A self-adaptive PID algorithm based on RBF neural network is employed to design position loop controller and a feed-forward control algorithm is used in the speed loop controller. The improved double closed-loop controller validated the feasibility of the new method for the design of brushless DC torque motor position servo system
Dynamic Model Identification of Marine Electric Propulsion System
Authors: Wu Qiang , Xiong Hao , Meng Guang Wei , Zhou Li Bing
Published: April 2012

This paper applies identification technique to the marine electric propulsion system analysis, adopts the recursive extended least squares (RELS) algorithm to estimate the structure and parameters of the model, employs the variable forgetting factors into the algorithm to improve the tracking characteristic of the parameters, establishes the dynamic model of a simulated electric propulsion unit under the excitation control based on the experiment data, and finally verifies the validity of the method through the consistency between simulation result and experimental result.
Numerical Simulation of Glass Bottle Forming Process
Authors: Zhang Dao Cheng , Zhu Ke Jun , Yin Shao Hui , Zhu Yong Jian
Published: April 2012

Glass forming process is a high-volume fabrication method for producing glass containers. In this paper, the mechanisms of glass forming process were analyzed. Combined the coupled thermo-mechanical analysis with the finite element method (FEM) simulation, it was carried out to analyze the key process factors such as forming temperature, forming pressure, friction coefficient. The results show that forming pressure has the greatest influence on the stress.
EMI Soft-Sensing and Filter Based on Wavelet Applied in Underground Monitoring System
Authors: Ma Feng Ying
Published: April 2012

In order to enhance Electromagnetic Compatibility (EMC) of monitoring system, the EMI distribution should be obtained. But the measurement could not be accomplished perfectly because of underground condition. A novel EMI soft-sensing method was proposed to measure the electromagnetic interference(EMI) indirectly. The wavelet time-frequency analysis was introduced to monitoring system and the EMI source could be ascertained. The startup time, duration and waveform could be detected based on the running records of underground electric equipments. The electrical fast transient/burst (EFT/B), the most outstanding interference, was studied to verify the validity of wavelet analysis. EMI filter was improved in accordance of the EMI gotten from wavelet analysis. Power port immunity was developed obviously. Therefore the EFT/B of data port was restrained markedly with wavelet filtration. Coordinative effect of EMI power and wavelet filter resulted in reduction of false alarms. Results indicate that wavelet analysis and the improved EMI filter have enhanced the EMC of monitoring substations and sensors obviously. It is concluded the wavelet analysis is of guiding significance to measure underground EMI distribution and EMC of the underground monitoring system.
Experimental Measurement and Analysis of Pulse Transmission Source of GPR
Authors: Xu Hui , Wu Guo Rui
Published: April 2012

According to the transmission pulse requirements of the impulse-GPR which probes the objectives of shallow soil, a transmission circuit is designed and made. On the basis of the transistor avalanche theory, avalanche transistor and RF transistor are used to generate the impulse-GPR transmission pulse as the core transistors. Trigger pulse is the square wave which is produced by FPGA as the trigger of whole system, its duty ratio under 10% and its frequency from 50 kHz to 500 kHz. As the results of simulation and actual measurement shown, single transistor avalanche circuit and four transistors cascade avalanche circuit can produce a narrow pulse with its pulse width from 1.337ns to 42.91ns. The results meet the transmission pulse requirements of impulse-GPR which probes the objectives of shallow soil.
FBG Displacement Sensor Application Research on Geology Security Monitoring of Substation
Authors: Shen Chao , Li Chuan , Xu Yun Shui , Yan Qing Hua , Zhang Shao Quan , Chen Yan , Xu Xiao Ping , Xu Xiang Chun , Li Ying Nan
Published: April 2012

The great area crack can cause the landslide of the substation sliding. Dislocation is the significant factor to reflect the crack. Embedded the mast structure of FBG displacement sensor, the relative displacement of retaining wall in YanJin substation can be obtained. Placed 3 FBG displacement sensors on the southeast corner of the substation downstream integrated the real-time monitoring system for the dislocation crack of YanJin substation downstream. In the monitoring results of the 479 days, daily average displacement of 3# sensor located in substation downstream maximized to 1.58mm on January 27th 2011; and daily average displacement of 2# sensor located in substation downstream minimized to -1.94mm on September 18th 2011. The monthly rainfall maximized to 123.5mm, 70.7mm, 75.9mm in July, August, September 2011 and minimized to 26.8mm, 12.9mm, and 23.3mm in January 2011, November, December 2010. Considered local precipitation, cracks closely related to the local precipitation.
Measuring of Nanometer Oxide Powders
Authors: Ye Zi , Xie Jun , Xie Xing Hua
Published: April 2012

Lithium manganese oxides with a fine spherical morphology different from that of the normal composite oxides are formed after detonation wave treatment due to the very high quenching rate. Free metal atoms are first released with the decomposition of explosives, and then theses metal and oxygen atoms are rearranged, coagulated and finally crystallized into lithium manganate during the expansion of detonation process. The growth of lithium manganate via detonation reaction was investigated with respect to the presence of an energetic precursor, such as the metallic nitrate and the degree of confinement of the explosive charge. The detonation products were characterized by scanning electron microscopy. Powder X-ray diffraction and transmission electron microscopy were used to characterize the products. Lithium manganate with spherical morphology and more uniform secondary particles, with smaller primary particles of diameters from 10 to 20 nm and a variety of morphologies were found.
Vision Based Eccentricity Measurement of Auto-Hub and its Simulation
Authors: Zhang Feng Ling , Han Rui , Peng Yin , Wang Lei
Published: April 2012

A machine vision based measurement system of auto-hub’s eccentricity between the center circle and the pitch circle of bolt holes is proposed in this article. Pictures of all bolt holes are shot when the auto-hub is rotating. The eccentricity can be calculated by tiling these pictures to a global image. There are some error factors in the system such as run-out of rotation center, inclined platform, rotation angle error, tilted auto-hub’s surface, roundness of the center hole and angle between bolt holes uneven. Mathematical models of these error factors are studied. By stimulating all these error factors, run-out of rotation center has the greatest impact and some key parameters are given in mechanical system design.
Quantitative Analysis of the Sesame Oil Purity by Similarity of Chromatographic Fingerprint
Authors: Li Xue Qin , Miao Xiao Liang
Published: April 2012

16 samples of sesame oils adulteration with rapeseed oil and peanut oil were detected by gas chromatography, and the Similarity of chromatographic fingerprint (SCF) was applied to analysis the adulteration quantity of these samples. The Weighted Vectorial Angle Method (WVAM) was brought forward to calculate similarity between fingerprints of adulterated oil and unadulterated oil. The experiment results showed that the Similarity of chromatographic fingerprint can be proposed as the major analysis method to assess the sesame oil purity.
Simulation of Aluminum Electrolysis by Non-Grid-Connection Wind Power
Authors: Gu Wei Dong , Du Zhen Long
Published: April 2012

The wind power is an important energy complement to fossil fuels consumption, bears the advantages of green, renewable and carbon emission-free. The wind energy has been developing and exploiting in recent decades around the world, but because wind power holds high fluctuation and instability, direct grid connection brings about some technical and management problems. Non-grid-connection wind power consumes the generated power into some high energy consumption fields, it is a local method to utilize wind power, and bears convenience, high efficiency, and practicality. In the paper, a virtual reality system is built, which demonstrates the aluminum electrolysis by non-grid-connection wind power. Based on the developed virtual reality simulation system, the key processes are able to offline analyzed, and the engineering configuration is capable of demonstrated, meanwhile, some key engineering problems are predicted in advance.
Measurement Techniques Study of Universal Tool Microscope
Authors: Tan Xiang Fu , Xu Chao Xiong , Shi Rui Wen , Guo Wei Jian , Mao Tao , Hu Chun Yu
Published: April 2012

The universal tool microscope is widely applied in geometric measurement, as the imaging method is a typical measurement methods. In this paper, data processing and calculation example to specify the method of image measurement of the external thread, Classifications have been carried out systematically in this paper on the origin of error of the universal tool microscope, the image- measuring methods was summarized.
Theoretical Analysis for Sensitivity Enhancement in Broad-Band Thermal Lens Microscope
Authors: Liu Ming Qiang , Franko Mladen
Published: April 2012

Thermal lens microscope (TLM) coupled to lab-on-chip chemistry in microfluidic systems is a powerful tool for analyzing a variety of compounds. However, the limited range of emission lines of laser-based TLM severely restricted the specificity of this technique and therefore limited the use of such TLM systems for practical applications. Here, a broad-band incoherent light source was introduced into the TLM to improve the specificity. A three-layer theoretical model was built. Through numerical simulation, it was found that at usual sample length of 100 μm in micro-volumes, the sensitivity can be increased by approximately one order of magnitude at low frequencies when the top and bottom layers are organic solvents. The sensitivity is even higher than that in laser excitation case.
The Design and Development of a PEMFC Testing System
Authors: Zhang Hao , Yang Dai Jun , Li Bing , Wang Fei Jie , Ma Jian Xin
Published: April 2012

Proton exchange membrane fuel cell (PEMFC) is considered a promising energy generation device. Testing is critical for evaluating the performance and durability of PEMFC stacks. In this paper, a PEMFC testing system was designed and developed, which consisted of hydrogen fueling subsystem, air supplying subsystem, cooling subsystem, and control subsystem. The operation conditions were optimized through a series of experiments. Test was taken with a 47-cell PEMFC stack, and the system efficiency reached 44% when the stack output power was 4.2kW.
Improvement of the C650 Lathe Electrical Control Circuit
Authors: Zhang Gui Xiang , Yao Cun Zhi
Published: April 2012

Under the precondition of keeping the original control circuit’s all control functions and not adding any electrical components, we make necessary improvements to the control circuit aiming at the two problems existing in the lathe main motor control circuit. The improved control circuit is more safe and reliable, the control functions is more perfect.
The Processing of the Defects Images of Knitted Fabrics
Authors: Wei Jing Jing , Liu Yan Jun
Published: April 2012

The computer techniques are used in the processing of the defects images of weft knitted fabrics in this paper. First, the fabric defects images are collected, and are pretreated in order to be seen more clearly. Then the classification and the extraction of characteristic value of the defects are introduced on the basis of researching anglicizing of the pretreated images, and reaching the purpose of identifying the defects types of weft knitted fabrics.
Research on Operation Sequence Based on Freedom Constraints of Workpiece
Authors: Wu Tie Jun , Wu Hong Bing , Wang Hong Bo
Published: April 2012

The determination of process route is a complex process and one of key techniques of computer-aided process planning. workpiece surfaces are classified. The machining element is determined and ranked according to rules of technological design. Finally, all the machining elements are reorganized and ranked with the comprehensive consideration of freedom constraints of workpiecesand technological equipment. The operation sequence is generated automatically.
An Improved Device of Detecting True and False Coin
Authors: Yu Chun He , Tian Xiao Feng , Zhang Dan Ping
Published: April 2012

In order to reduce the loss of an automatic coin machine for using a 1-Yuan false coin, an improved device is designed by applying the eddy current nondestructive testing technology, which uses two distinct frequency signals to detect the information of coin. The device includes four modules: two LC oscillating circuits, signal processing module, microprocessor module and external control circuits. The detection algorithm selects two counting values under two distinct frequency signals. The low frequency circuit detects the information of the coin material, and the high frequency circuit detects the feature of the coin surface. The detection region of true coin is decided by the method of least square. The experiment shows that the device has the characters of stability, reliability and high accuracy.
Use of NIR Spectroscopy Combined with Recognition Methods for the Identification of Black Teas from Different Regions
Authors: Ning Jing Ming , Wang Sheng Peng , Zhang Zheng Zhu , Wan Xiao Chun
Published: April 2012

Near-infrared (NIR) spectroscopy, combined with pattern recognition, was applied in this study for the rapid identification of Black tea from different origins.The K-Nearest Neighbor model recognition method was used for the establishment of a tea origin recognition model, which involved optimization of the principal component factors (PCs) and the identification rate using a cross-validation method. The experimental results showed that, after standard normal variant spectral preprocessing, an optimized model was obtained when the PCs were equal to three, with the cross-validation recognition rate and the predicted recognition rate reaching 98.1% and 93.3%, respectively.
The Study of Fuzzy Pid Control to AC Servo System
Authors: Xu Ai Qin , Wu Jing
Published: April 2012

AC servo system catches scholars and researchers’ more attentions. A fuzzy PID control strategy is proposed to the AC servo system. Using critical proportioning method to adjust the PID parameter, building two dimension fuzzy controllers to adjust the parameter and compensate the rotational speed. Analysis of simulation experiment of PID and incremental Fuzzy PID control, the result shows that the validity of the method.
Modeling and Simulation of Airdrop Process with Parachute for Complex Terrain and Wind Disturbance
Authors: Hu Xiao Yang , Yao Jun
Published: April 2012

Usually sense airdrop by parachute is technology for delivery to the specified point, above the target point, to a certain initial velocity dropped supplies will be released, due to put things in a fall influenced by many factors (such as wind disturbance, topography and other factors ),the launch point and target placement will have a certain bias. United States and some European countries started in 2005 to examine the controlled parachute drop, and achieved certain results, this paper will analyze umbrella dropped supplies for the complex topography of the control process
Study on Fault Diagnosis System Based on IOT and Vector Spectrum
Authors: Dong Xin Min , Hao Wang Shen , Han Jie
Published: April 2012

Some critical technologies of IOT and Vector Spectrum were introduced. Based on IOT and Vector Spectrum, a fault diagnosis system had been constructed. Using the advantages of IOT and Vector Spectrum, the system could not only monitor state of the devices efficiently, but also raise the accuracy and reliability of the fault diagnosis.
Adaptive Sliding Mode Controller Designs for Fault-Tolerant Control Systems with Sensor Failures and State Time-Delays
Authors: Sun Sheng Qi , Li Xue Bin
Published: April 2012

In this paper, an adaptive sliding model design method is proposed to deal with the asymptotic stabilization problem for a class of fault-tolerant control systems with sensor failures and state time-delays. The considered faults on sensors are assumed to be unknown but depended on the system states without breaching the practical case, while the effects of time delays are also related to the states. For the sake of eliminating the effects of sensor faults and delays, an adaptive sliding mode controller is developed by using the fault signals transmitted by sensors with adjusting some adaptive estimations. Then the asymptotic stability results are ensured by using the proposed static output feedback controller via Lyapunov stability theory. The proposed design technique is finally evaluated in the light of a simulation example.
Research on Wireless Vibration Monitoring System for Devices in the Engine Room
Authors: Zhang Guo Yong , Wu Shuo
Published: April 2012

The vibration can influence the running of devices in the engine room. It is necessary to monitor the vibration state of all running machineries. Through integrating the Bluetooth technology into the common vibration sensor, a wireless on-line vibration monitoring system is designed to monitor all devices. It will be helpful to avoid severe failure and improve the cruising ability.
Faults Detection Logic Updating of Fuel Metering Valve on Aero-Engine
Authors: Ao Liang Zhong
Published: April 2012

The basic faults detection logic of fuel flow metering valve can not detect all the faults. It may cause un-commanded in-flight shut-down (IFSD) on the aero-engine and threat the flight safety. The operation principle of fuel flow metering valve is introduced in this paper. The basic faults detection logic is given. Two IFSD examples are presented. To reduce the un-commanded IFSD, faults detection logic updating is discussed. It can be used to design the new control software of the aero-engine and improve the aero-engine’s reliability.
Measurement of Loads on Well Testing Tubing Strings and Stress Analysis
Authors: Cao Yin Ping , Zhang Fu Xiang , Chen Rong , Dou Yi Hua
Published: April 2012

To get working loads for analysis of strength safety of well testing tubing strings, providing references to combine tubing strings and select operation parameters, the working loads of tubing string were measured by self-made load measurement device for down-hole tubular strings and the stresses of tubing strings with measured load were analyzed with ANSYS. The dynamic response and strength of tubing strings exerted by varied pressures and weight were analyzed, taking wellhead and packer as fixed constraints. It was found that the maximum stress would vary sharply around the baseline with radial acceleration and increase as much as 37% if the acceleration is 0.38g
Effect of Different Nutrient Components on Polysaccharide and Biomass Production from Fomitopsis pinicola Karst
Authors: Hao Li Min , Li Zheng , Zhao Ai Li , Chen Wei Long , Wang Zi Tao
Published: April 2012

The Fomitopsis pinicola Karst is a novel mushroom. Its exo-polysaccharide and biomass of F.pinicola Karst have widely potential applications. In this paper, effect of different nutrient components on exo-polysaccharide and biomass production was reported. The results revealed that the optimal medium for producing CEPS was (g/L): glucose 150, yeast extract 5, MgSO4•7H2O 0.8, KH2PO4 1.2. The optimal medium for biomass growth was (g/L): glucose 150, yeast extract 15, MgSO4•7H2O 0.6, KH2PO4 1.4.
Research and Development of CNC Machine Simulating System
Authors: Deng Qi Xing , Chen Wei Zhen
Published: April 2012

This article describes a combination of Visual C++ and OpenGL for dynamic simulation of CNC system, including three major forms of treatment: geometric modeling, NC-code compilation and simulation displayed.
The Influence of Induction Heating to Reheating Temperature Axial Distribution
Authors: Jia Yu Xian , Wang Cheng Zhi
Published: April 2012

The second remelt is an important influencing factor during semi-solid thixotropy forming technology, and the microstructure is immediately impacted by temperature distribution state. By the way of induction heating the axial temperature distribution state of 45# steel is researched in this paper. The results indicate: the uniformity of axial temperature distribution doesn’t reach the ideal state. There are wider differences in temperature among various points while the heating power is definite. When the change of power the differences of temperature get smaller and there are the trends of homogeneous.
Influences of Mould’s Shape on Heat Transfer in Hot Forming Process
Authors: Xu Kong Lian , Tan Zan Wu , Hu Su Yun
Published: April 2012

Ultra-precision mould is widely used as the most important material in hot forming manufacture industry in recent years. Hot forming process has been employed as a promising technique to manufacture small size components in mass production. In this paper, an effective method of improving the heating or the cooling effectiveness is to increase the area exposed to the cold or hot nitrogen by means of adding slots. In the same condition, four models with different slots were built. Based on the theoretical analysis of glass heating and cooling property in the forming process, finite element simulation was carried out. The results showed that the model with slots may decrease the heating and cooling time
Study on Implementation Technology of the Hydraulic System of Certain Engineering Equipment
Authors: Liu Xue Xia
Published: April 2012

The model suitable to the fault test and diagnosis of hydraulic system of certain engineering equipment is described. The corresponding hardware and software platforms are developed, which can realize data acquisition, processing and fault diagnosis. Based on the multi-thread and multi-panel control technology, the parallel processing and order execution of tasks are achieved. The channel configuration files and system parameter configuration files are made, which can implement automatic signal acquisition. The corresponding remote test and diagnosis system is build based on C/S mode.