bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and Characterization of Nanocrystalline Diamond Films Deposited by Microwave Plasma Chemical Vapour Deposition
Authors: Zhou Wen Long , Zhang Ming , Song Xue Mei , Yan Hui
Published: August 2011

Nanocrystalline diamond films have been synthesized by microwave plasma enhanced chemical vapour deposition using H2/CH4as the reactant gas. Nanocrystalline diamond thin films with surface roughness of 11.8 nm were obtained on silicon substrates. The nanocrystallinity, surface roughness and hardness were characterized by the Raman spectroscopy, X-ray diffraction (XRD), atomic force microscopy and Nano Indentation, respectively. The Raman spectra of the films exhibit a band near 1145 cm-1and XRD patterns indicate the presence of nanocrystalline diamond. The hardness value of individual test point is approximately 102 GPa and the average hardness of thin film could reach 86 GPa.
Probability Boxes and DS Structures’ Research Prospects in the Mechanical Fault Signals Data Fusion
Authors: Du Yi , Chi Yi Lin , Xing Wu
Published: August 2011

In the traditional machinery fault diagnosis, the feature extraction leads information loss and the different information sources’ space-time registration is a difficult problem. The Probability boxes and Dempster-Shafer Structure Theory can provide a new way to solve above difficulties. This theory has a large advantage in solving uncertainties. It can be adapted for the inconstant machinery environment. In this paper, firstly the concepts of this theory are summarized and some methods of getting probability boxes are given. Secondly the method’s feasibility is discussed. Finally some promising research directions of this theory’s applications in the machinery fault diagnosis are advanced.
Fabrication of Metal Matrix Ceramic Coating and its Erosive Wear Behaviour
Authors: Gu Xiao Bing , Wang En Ze , Zhang Zheng Quan
Published: August 2011

By simulating the solid-gas duplex erosive wear condition, the fabricating process of the metal matrix ceramic coating was investigated, and the properties of the ceramic coating under different fabricating conditions were studied, and the erosive wear behaviour of the ceramic coating with different volume fraction of Al2O3 particles and the mechanisms of material removal were researched and discussed. The results show that the metal matrix ceramic coating should be fabricated on the enamel coating which was prepared in advance on Q235A steel surface, and the anti-wear property of the ceramic coating containing Al2O3is better than the coating without Al2O3, and the coating with 40% volume fraction particles, eroded at velocity of 20 m/s at 45° impact angle, is the best, which is 3.67 times than that of the enamel coating.
Process Optimization and Composition Analysis of Antioxidant Enzymatic Hydrolysate from Squid By-Products by Papain
Authors: Wang Bin , Ma Jia Hui , Qu You Le , Wang Xian , Li Li
Published: August 2011

In order to evaluate the high-value application of squid by-products yielded hydrolysate, the process of preparation and purification technology, chemical composition and in vitro antioxidant activity of the hydrolysate were investigated. The optimal conditions of papain hydrolysis were obtained by single-factor experiments and orthogonal test with the DPPH• scavenging ratio as index, amino acid composition was analysed by automatic amino acid analyzer, the hydrolysate was isolated with a Sephadex G-25 column. Based on single-factor experiments, the hydrolysate with the DPPH• scavenging ratio being 53.96 % was gained under the optimal condition of enzymolysis temperature of 45 °C, enzymolysis time of 3 h, total enzyme dose of 1.2 %, and the pH value of 7. The protein content of the hydrolysate reached up to 17.53 %, and the essential amino acids were accounted for 51.06 % of total amino acids. The largest content amino acid was glutamic acid, which accounted for 10.74 % of total amino acids. Compared with the amino acid profiles recommended by FAO/WHO, the quality of the protein hydrolysate was high, as it was rich in essential amino acids, including isoleucine, leucine, lysine, methionine and cystine, threonine, tryptophan, and valine, which covered 88 %-100 % of the FAO/WHO recommended. The hydrolysate was divided into three fractions (F1-F3) using a Sephadex G-25 column, the F1 possessed the highest antioxidation activity with the reducing power, •OH and DPPH• scavenging ratio being 0.236, 18.13 % and 63.85 % at the concentration of 5 mg/mL. Compared with the retention time of the reduced glutathione chromatomap, the relative molecular mass of F1 was higher than 307, F2 and F3 was lower than 307. The result revealed that the protein hydrolysate from squid by-products by papain had strongly antioxidant capacity in vitro and high nutrition, and this finding provided a new way of advanced exploitation of squid scrap resources.
Safety Assessment on Hydrogen Peroxide for Storage and Transportation Based on Runaway Scenario
Authors: Wu De Jian , Qian Xin Ming , Huang Ping
Published: August 2011

Hydrogen peroxide is a very versatile reagent for many industrial processes. Nevertheless, it is very sensitive to impurities that can catalyze its decomposition violently. Combining the recent year’s hydrogen peroxide explosion accidents, this paper seeks to establish the evaluation model for its safe storage and transportation. Firstly, the runaway scenario that can serve as a basis for the assessment of the thermal risk was briefly described. Secondly, the adiabatic temperature increase () and the pressure for closed systems were used as the severity of the assessment criteria. Both closed and open systems were discussed. Thirdly, the time to maximum rate (TMRad) was presented as the probability of occurrence of the scenario. Finally, the established model was exemplified by two examples both with and without contamination. The results show that at 20°C the severity of 30(wt.) % H2O2is critical and a small amount of Fe3+(12.7mg∙L-1) reduces theTMRadof 30(wt.) % H2O2by almost a factor of eleven. This approach can assess the safety of hydrogen peroxide for storage and transportation in advance.
Influence Factors of Railway Vehicle Interior Impact Injury
Authors: Wang Wen Bin
Published: August 2011

Based on interior configurations of railway vehicle of China and simulation using modeling of MADYMO Hybrid III 50% Dummy, the occupant injury of interior impact in railway crash events is analyzed according the European and American standard. The results indicated that in the face to face seating without table, the injury is serious then face to back and face to face with table .The other affect factors are the stiffness of interior equipment and the distance of seats. It is needed to optimize the parameter of interior equipment to reduce injury risk for the occupants under collision scenarios. At last the suggestions and methods for railway vehicle occupant safety protection are put forward in the paper.
Method of Displacement Parameters Prediction Based on Neural Network for Natural Gas Pipeline
Authors: Liu Shu Lin , Wang Xian Ming , Zhang Rui , Tang You Fu , Cong Rui
Published: August 2011

Theoretical investigation is not enough for natural gas pipeline displacement technology of nitrogen isolation method without isolator, which makes displacement parameters hard to be controlled accurately. Therefore, the method of natural gas pipeline displacement parameters prediction based on neural network is proposed in this paper. From Fluent numerical simulation, some useful information is acquired, such as displacement parameters under the typical working conditions, the relationship between different working conditions and nitrogen injection capacity. Moreover, the samples gained by simulation are trained by neutral network which has association function. Thus the aim of forecasting process parameter for nitrogen displacement technology without isolator is attained, which provides an important reference for the production of nitrogen displacement of nature gas pipeline without isolator.
Oxygen Pressure Acid Leaching of Vanadium Slag
Authors: Mu Wang Zhong , Zhang Ting An , Dou Zhi He , Lü Guo Zhi , Hu Lan , Yu Bin , Liu Yan
Published: August 2011

Oxygen pressure acid leaching process was used to extract vanadium from vanadium slag (Panzhihua steelmaking plant of China). The single factor experiment was finished and the effects of temperature, leaching time, liquid to solid ratio, stirring speed, initial concentration of sulfuric acid, and were investigated on the leaching rate of vanadium, titanium and iron. The leachate and residue were characterized by ICP, XRF, XRD, SEM and EDX. The experiment results indicate when temperature is 140 °C, leaching time is 120 min, liquid to solid ratio is 20:1(ml:g), stirring speed is 500 rpm, initial acid concentration is 200 g/L, oxygen partial pressure is 0.5 MPa, and particle size is -0.075~+0.055 mm, leaching rate of vanadium is 97.89% and the content of vanadium in the residue is 0.586%. Leaching rate of titanium and iron is 12.78% and 94.45% respectively. Vanadium could be extracted effectively through the oxygen pressure acid leaching process.
Effect of Solvent Residuals on the Structure and Properties of Polyacrylonitrile Fibers
Authors: Ji Bao Hua
Published: August 2011

In order to study the effect of solvent residuals on structure and properties of polyacrylonitrile fibers, the morphology, crystallinity and thermal properties of the fibers were discussed by Electron Microprobe Analysis, X-Ray Diffraction and DSC Analysis. It showed that the cross-section of the fibers with a lower solvent residual tends to be circular. The higher the solvent residuals are, the lower the crystallinity of the fibers and the bigger the crystal size. With the increase of solvent residual, the initial temperature of the fibers’ exothermic peak is in advance and the terminal temperature lags behind, the peak temperature increases, and the heat release also increases. Excessive solvent residuals make the heatrelease reaction very violent and the heatrelease increases. The ladder-shaped cyclation structure formed during the preoxidation process often breaks down because of the instant vast heatrelease.
Transformation Behavior of Molybdenum during Pressure Oxidation Process of Molybdenite Concentrate
Authors: Mu Wang Zhong , Zhang Ting An , Lü Guo Zhi , Dou Zhi He , Hu Lan , Zeng Yong , Liu Yan
Published: August 2011

MoS2(AR) was used to analyze molybdenum transformation behavior in the pressure oxidation process of Chile molybdenite concentrate. Amount of NaNO3, temperature and sulphuric acid concentration were investigated on the total transform rate of Mo, leaching rate of Mo and absolute transform rate of Mo in residue. ICP, XRF, XRD were used to analyze the content and phase of elements in the molybdenite concentrate and residue. Single factor experiment results of indicate that when amount of NaNO3 is 1:4, temperature is 150°C,sulphuric acid concentration is 40g/L, oxygen partial pressure is 0.8MPa, liquid to solid ratio is 6:1(ml:g), reaction time is 120min and stirring speed is 500rpm, total transform rate of Mo is 97.95%, leaching rate of Mo is 18.48% and absolute transform rate of Mo in residue is 79.47%. Synthetical condition experiment results certified this process has the preferably reproducibility. Molybdenum could be recovered sufficiently through this method.
Failure Analysis of Spiral Plate Heat Exchanger
Authors: Li Meng Li , Wang Wei Qiang , Tang Jie , Ma Xiao Hui
Published: August 2011

The comprehensive failure analysis was taken to investigate the leakage initiation of spiral plate heat exchanger. The micro appearance of cracks in spiral plates, chemical composition, metallographic structure, crack fracture and tensile properties were analyzed. The results show that the failure of spiral plates is most likely due to the non-standard design and manufacture combined with alternating load caused by alkali washing.
Study on the Thermal and Rheological Properties of Reactive Blending PC/PLA/EVA Blends
Authors: Chen Yi , Zeng Guang Sheng , Jiang Ping , Lu Wei , Huang Wei Long
Published: August 2011

EVA was added into PC/PLA blends as a modifier for improving the impact strength of blends, and meanwhile the thermal properties and rheological properties of blends should also be influenced. PC/PLA/EVA blends were prepared by melt blending and the catalyst DBTO was added into the blends in blending process to catalyze the transesterification of PC and EVA for improving the compatibility of blends. The effects of blend composition and transesterification on the thermal and rheological properties of blends were investigated. The results showed that the addition of EVA could improve the crystallinity of PLA in PC/PLA/EVA blends but had little influence on the thermal stability of blends,and the transesterification was beneficial to both the crystallization of PLA and thermal stability of blends. The addition of EVA and the transesterification of PC and EVA increased the apparent viscosity of blends, while the apparent viscosity of blends decreased drastically and the pseudo-plasticity characteristic of blend melts was weakened obviously with increasing PLA content and rising temperature.
Metal Low Temperature Brittleness and Low Temperature Machining
Authors: Liu Li Hong , Cao Han Bing , Li Zhan Ni
Published: August 2011

Most metal materials tend to produce brittle fracture at low temperature. Nominal stress of producing brittle fracture is low, generally lower than yield limit. By use of this property, the machinability of the workpiece, tool life and workpiece surface quality can be improved. Classification and application of low temperature machining was introduced in the paper. Tests of low temperature machining were carried out. The test results show low temperature machining is superior to the cutting in normal temperature for the aspects of tool life and the roughness of workpiece surface.
Influence of Total Solid and Stirring Frequency on Performance of Dry Anaerobic Digestion Treating Cattle Manure
Authors: Li Hong Li , Wang Yan
Published: August 2011

The aim of this paper was to analyze the biomethanization process of cattle manure with four different total solid percentages (15%, 20%, 25%, 30% TS) and three different stirring frequency. The experimental procedure was programmed to select the initial performance parameter and the operational parameter in a lab-reactor. The values of VFAs indicated that all the reactors showed no destabilization and at the end of the experiment the VFAs were consumed completely. The best performance for cattle manure biodegradation and methane generation was the reactor with 20% TS, with the biogas yield of 0.22 L/g VS and the methane yield of 0.11 LCH4/g VS. Furthermore, the better operational parameter of stirring frequency was stirring once every two days.
A New Rough Machining Approach for a Ruled Surface Impeller
Authors: Liang Quan , Wang Yong Zhang
Published: August 2011

In order to improve the efficiency of integrated impeller rough machining and make up the deficiency of commercial computer aided manufacturing (CAM) software in five-axis plunge milling, a ruled surface impeller plunge milling method was presented. Boundary vectors were generated according to an impeller’s ruled surface blade. Quaternion interpolation algorithm was used to interpolate cutter axes according to these boundary vectors. The computing formula of row spacing and stepover are deduced to ensure high material removal rate and machining efficiency. Hub surface and a blade finishing cutting path were also generated. Based on the algorithm, an integrated special impeller plunge milling CAM software was independently developed. The generated cutting path was simulated and also carried out practically. Simulation and experimental results show that this method improves the efficiency of impeller parts rough machining to a certain extent.
Application of Genetic Algorithm in Chemical Reaction Kinetics
Authors: Zhong Wei , Tian Zhou
Published: August 2011

In this paper, a summary of Genetic Algorithm methods developed recent years applied in chemical reaction kinetics was presented. The applications of the Genetic Algorithm in reduction of the chemical reaction kinetics, estimation of the chemical kinetic parameters and calculation of the chemical kinetic equations were expounded here. Eventually, the confronted problem and developing trend of the application of Genetic Algorithm methods in chemical kinetics were reviewed.
Application of LOD Technology in the 3DVR Remote Control Platform for Shearer
Authors: Ji Xiao Gang , Wang Zhong Bin , Niu Ke
Published: August 2011

The scene model is extremely complex in the 3DVR remote control platform for shearer. In order to speed up the 3D scene rendering of 3DVR remote control platform for shearer and reduce computational load of the system, we simplified the scene model based on LOD technology. The LOD algorithm was designed, in which the computing method of simplification rate, the algorithm of Triangle mesh simplification based on contraction and data structure of original mesh was described. Two shearer drums were simulated in the XNA platform via the above method. The simulation experiment results show that LOD model generated by the LOD algorithm have almost no loss in the visual effect, meanwhile the complexity of the scene model is reduced and the scene rendering speed is improved.
Bearing Fault Diagnosis Based on Probability Boxes Theory and SVM Method
Authors: Du Yi , Chi Yi Lin , Xing Wu
Published: August 2011

To solve the information loss on the feature extraction process in the traditional fault diagnosis, this paper proposes a new method which based on probability boxes and Dempster Shafer Structure (DSS). The DSS was extracted from the raw data and then transformed into a probability box. The bearing fault diagnosis was done by the probability boxes images recognition. To solve the excessive computing cost caused by large sample frequency and the overlaps among p-boxes, the Support Vector Machine (SVM) was involved. The SVM features database was established by some cumulative uncertainty measures methods of p-boxes. The test result shows that this method is fast, not sensitive to noise and has high recognition rate with high accuracy.
The Construction of the Three-Dimensional Optimize Expert System of Oil-Immersed Pump Lectotype
Authors: Li Qiang , Li Jian Zhong
Published: August 2011

The applicability and accuracy of whole set oil-immersed pump lectotype are the key points to improve the recovery ratio of oil field and to conserve energy. This paper have conceived the construction and implementation of the expert system of whole set oil-immersed pump lectotype and discussed in several aspects: such as systematic analysis and design, the construction of engineering control platform, the development of plug-in software, the construction of intelligent system and the execution of software design and so on. It has integrated the synthetic approach with expert System of Whole Set Oil-immersed Pump lectotype.
Finite Element Analysis and Topology Optimization for the Gantry Milling Machine Column Structure
Authors: Huang Wei , Ou Chang Song , Lu Hai Man , Xie Zheng Liang
Published: August 2011

According to the limit working conditions of the gantry milling machine column, this paper adopts Parametric Design Language APDL to set up finite element model and make finite element analysis. Based on the analysis, the topology optimization method of column structure is proposed, and the optimal design method is established to minimize the weight. The finite element analysis is made again to analyze the rearranged column structure. Compared with the design made through experience, optimally designed column can reduce 10% weight. And the critical displacement and maximum stress are not affected.
Mining Rule of Quality Control for Spinning Process with Rough Set Theory
Authors: Xiang Qian , Lv Zhi Jun , Yang Jian Guo , Yin Xiang Gang
Published: August 2011

Due to absence of an integral mathematical model, quality control in spinning process has been hard problem for a long time. Rough sets theory (RST) is a methodology that effectively deals with the problems with inexact, uncertain or vague knowledge in a complex information system. Considering a mass of data from spinning process and inspection, as well as the variety of knowledge and experience from domain experts, an RST-based intelligent control model for spinning process is presented in this paper. In order to analyze the yarn strength when the characteristics of fibers are given, a rule extraction method based on RST is researched. The logical rules extracted from the decision table indicate that the initial strength of fibers is a key factor influencing on the yarn strength. At the same time, the different values combination of the final reduced attributes also obviously influence on the yarn strength in different degree when the certain nominal yarn is being processed. Therefore, RST method can be taken into account for spinners to choose suitable fiber materials in order to ensure the quality and reduce cost.
Influence on the Proprieties of PET Coated Diamond-Like Carbon Film for Different Preparing Condition by PECVD
Authors: Zhang Gai Mei , Chen Qiang , Xu Wen Cai , Pan Fei , Miao Bao Ping
Published: August 2011

Diamond-like carbon (DLC) films exhibit high hardness, high wear resistance and a low friction coefficient. They are extensively utilized in the mechanical, electronic and biomedical industries. Due to the gas barrier properties, it is used in the food industry also. To investigate the binding capacity of the DLC with the substrate and reduce the contamination for foods. The DLC (a-C: H) films on the glass slide and PET film were prepared successfully for different process parameters by plasma enhanced chemical vapor deposition (PECVD). In order to characterize the DLC film, the images of DLC was visualized by the atomic force microscope (AFM). The films were analyzed by Fourier transform infrared spectroscopy (RTIF). The contact angle and oxygen permeation analyzer (OTR) of the PET with and without the DLC coating were investigated experimentally. The results show that the DLC coating can improve the barriers and surface properties.
A Nonlinear Multi-Objective Optimal Design for Cutter Head of TBM
Authors: Cheng Jun , Gong Ya Dong , Zhao Hai Feng , Liu Yue Ming , Yang Jian Yu
Published: August 2011

This paper presents a novel model of lay out of cutter head of TBM(tunnel boring machine). Rock-broken mechanism during the operation of the cutter head is analyzed to study the layout of cutters. A model of the cutters under the action of forces during TBM’s working has therefore been developed, thus proposing a scheme to improve the rock breakability of TBM’s cutter head on which the cutters are lay out. Then, a nonlinear multi-objective mathematical model with complex constraints is developed, with an optimization program provided via an intelligent algorithm for the layout design of cutters on the cutter head of a TBM. The cutter head of an EPB6.28 TBM, an optimized design is given to set up a prototype with digitized cutter head, to which a simulation is done for the verification of equilibrium of forces. Comparing analytically the cutter wear and equilibrium of forces between a previous and a newly designed cutter heads, the results shows digitally that the new one is more practicable than the previous one.
Dynamic Characteristics of Guideway Joints for CNC Machine Tool
Authors: Zhu Chun Xia , Li Bin , Luo Ji Man
Published: August 2011

In order to analyze accurately the dynamic characteristics of guideway joints of CNC, the finite element model(FEM) of guideway joints of CNC is built in ANASYS software, which that springs and damping units imitate guideway joints in this paper. The proposed method can predict the regular pattern which joint stiffness and joint span affect natural frequency and harmonic response. The research demonstrates that the method predicts well the dynamic characteristics of the guideway joints of CNC; therefore, it can be a reference for dynamic optimization design of guideway joints of CNC machine tool.
The Optimization of Braking Force Distribution Control Strategy for ESP System
Authors: Wang De Jun , Wang Yuan Yuan , Feng Hong Hong , Wang Li Hua , Liu Chao
Published: August 2011

To adjust the car yawing moment through specific wheels braking is a kind of widely used method by various auto stability control system. The braking of different wheels will have different effects on direction and the size of the car yawing moment. Based on the established simulink simulation model platform of automobile Electronic Stability Program (ESP) control system, this paper makes a research and analysis on the vehicle stability in five kinds of typical working conditions under three kinds of braking force distribution control strategies. Finally, we propose an optimized braking force distribution control strategy which is determined by the road condition.
High Dynamic Humanoid Robot Arm for Ping-Pong Playing
Authors: Zhang Qi , Xie Zong Wu , Liu Yi Wei , Li Zhi Qi , Liu Hong
Published: August 2011

In this paper, a high dynamic humanoid manipulator with DSP/FPGA-FPGAs hardware structure is designed to meet the demand of high-speed response required by playing ping-pong game. The manipulator integrates several sensors in each joint unit, and the controller is divided into two levels. The upper level mainly solves the kinematics and trajectory planning in DSP, while the lower level realizes the joint control such as vector control and sensors data processing in FPGA. The two levels communicate with each other by multipoint low-voltage differential signaling (M-LVDS) serial data bus every 200μs. Experiments of the manipulator hitting the ping-pang are done to demonstrate the design of this arm. The results show that the arm can reach the speed of 2.2m/s, and it creates a record of 22 continuous hits of the ball with a human rival.
Study on Effect of Electronically Controlled EGR System on Diesel Engine Performance
Authors: Su Zhong Gen , Long Jiang Qi
Published: August 2011

This paper designs an electronic control EGR system used in diesel engine and researches the influence of different EGR rate on engine economy and the emission characteristics of the 13- modes cycle. The results show that the specific fuel consumption of the test engine rises at different degrees after using electronically controlled EGR technology, especially in high load areas; NOx emissions have a more significant decline and particles increase to a certain extent; Overall, however, emissions of HC do not nearly change; CO emissions are closely related to EGR rate.
Research of the Installation Angle of New Rotor Impact Plate Based on EDEM
Authors: Duan De Rong , Zhao Fang , Wang Song , Chen Xian Xin
Published: August 2011

The three-dimensional model of new rotor was imported into EDEM for dynamic simulation, the maximum speed and force were analysied in the EDEM,indicating that the material along the deterministic trajectory collide with the impact plate for second acceleration after the first acceleration in new rotor, the velocity after second acceleration was 2.3 times than the first acceleration.The impact force and angle did not substantial effect on the second acceleration by comprehensive comparing,the 69m/s speed and less impact force were generated in the new rotor with 2° impact plate installation angle.
Numerical Simulation of 3D Flow in Rotation Cup of Rotor Spinning
Authors: Yang Xi Wei , Chen Hong Li , Wu Zhen Yu , Xu Shi Fu
Published: August 2011

To make design of rotation cup device more reasonable, the air-flow-field in rotation cup should be analyzed. Numerical simulation is conducted on 3D flow in rotation cup of rotor spinning with Fluent and the simulation results reveal the airflow characteristics as: the vortex is generated in rotation cup and the airflow speed decreases gradually on slip plane; the airflow in the type of V accumulation groove is more intensive and a little faster than that in the type of U accumulation groove in the same condition; there exist two strands of reverse direction airflow in accumulation groove; there exist two high pressure regions on slip plane and accumulation groove.
A New Non-Destructive Testing Method Used in the Axle of Landing Gear
Authors: Tu Qing Song , Zhang Wei Min , Huang Li , Chen Cheng Feng , Yong Qiu
Published: August 2011

The relations between stresses and leakage magnetic signal of concentration area of the airplane’s landing gear under varying load were studied. The finite element method was used to calculate the stress of axle under different conditions; An experiment was designed to simulate the stress status under the bending moment, the slight magnetic signals on specimen were measured, and the relation of the signals and stress was studied. The new testing method was explained with the theory of ferromagnetic and the significance of this technique for detecting defects of the airplane structural part was discussed. The safety of airplane’s main bearing parts plays an important role during its operation and it often comes to bad situation of fatigue damage for stress concentration [1, 2]. To prevent the breaking down of structural parts and get rid of big accidents, it becomes important and necessary to find out the early concentration and damage zone, and to make some certain examination of damage and stress status [3]. The method of magnetic memory testing would be effective for the confirming of stress concentration zone in the equipment or structural parts, and could lead the way ahead the matters of fatigue analysis, evaluation of equipment life and technological design. The method can detect the endurance failure of the airplane’s undercarriage shaft, which is composed of ferromagnetic materials, and that provides the experimental basis for the prevention of parts’ fatigue defects.
Study on High Risky Spots of Engine Hood for Pedestrian Head Crash
Authors: Liu Rui Jun , Yu Sheng Wu
Published: August 2011

This paper has proved that the HIC of local engine hood collision area is relative to the distance between the collision point and potential secondary collision point, and with the rigidity of the second collision point, in the process of protection for pedestrians. The pertinence formula was built and the high risky spot of each local collision areas was doped out quickly, and the accuracy of the formula is validated by the subsequent real car collision test.
Jumping Mechanism and Simulation of the Humanoid Robot
Authors: Chen Yong
Published: August 2011

The jumping procedure of the human was captured with a high-speed video camera. The geometrical configurations and motion postures of the human during jumping were analyzed from the high-speed photographs. Based on the biological observation, the human jump was simplified and a mechanical model was put forward. The height and vertical velocity of COM of the human were analyzed. The angular velocity of the shoulder joint, hip joint, knee joint and ankle joint were shown in figure.It was shown that the arm swing was able to help increase the takeoff velocity. The results would provide some theoretical and practical references for biomimetic design for improving the reasonable motion of the jumping robot. This work may provide the basic theory in developing human jumping robot in structural design. Besides, it provides an important reference to study the other bionic robots.
Reliability Assessment Method of the System with Multiple Degradation Parameters Based on SVDD and SVR
Authors: Cong Hua , Wu Guang Ping , Feng Fu Zhou , Rao Guo Qiang
Published: August 2011

This paper presents a reliability assessment method for the system with multiple degradation parameters based on SVDD and SVR. The method transforms different performance parameters of the system to a distance measure by SVDD, uses SVR to analyze and predict the distribution parameters of SVDD distance, then create the overall system performance degradation assessment model. Through vehicle tracking experiment, collecting different degradation parameters of the diesel engine, a reliability curve stands for the whole system degradation is achieved. Compared to traditional reliability assessment method, the new method combines the various parameters so that more effectively describes the diesel engine performance degradation, and is more instructive for the maintenance of the vehicle.
BW-FILERAID: A Kind of File Based Distributed RAID System and Optimization
Authors: Guo Tao , Shen Yu Liang , Liu Zhen Jun , Xu Lu
Published: August 2011

In the ever-increasing development of network storage technology, distributed RAID has been a hot topic for data reliability and availability. To solve the problem of distributed RAID technology, such as: parallel access difficulty, long rebuild time, small write update and strip alignment problem, we design and implement file level distributed RAID system (BW-FILERAID) based on Blue Whale File System (BWFS). Also we do the research on resource allocation strategy, page cache management with parity data, consistence maintenance, online extension of RAID group, error detect and rebuild and small write optimization in BW-FILERAID. According to the testing results, the writing performance of BW-FILERAID is better than Linux soft RAID about 5%~50%, and the reading performance is equivalent to the RAID0. And it also has excellent extensibility.
A Study of Equipment Fault Forecast System Based on Virtual Setting
Authors: Huang Jing De
Published: August 2011

Fault forecasting model based on dynamic fuzzy synthetically Judging and five units model of forecasting coefficient are built up, and method of selecting coefficient is made certain. On the other hand, this paper put forward technical disposing method of fault judging result, and discusses method of fault pattern recognition. Based on these all establishes important foundation of theory and technology, this system has been successfully adopted in detection, evaluation, and maintenance of large-caliber gun based on states.
Design of Chatter Measurement and Control System Based on Virtual Instrument
Authors: Li Jin Hua , Liu Yong Xian , Yu Yang , Han Jia Liang , Yi Deng Li
Published: August 2011

The technique to suppress regenerative chatter is to regulate the spindle speed around the mean speed to disturb the regenerative mechanism. According to the technique, it builds a platform to collect, process the machine working information and output control instruction. On the platform, some advanced algorithms are applied to analyze and finish the control task.
Research about Post Processing for Fagor CNC System Based on Visual C++
Authors: Wang Chao , Yao Yuan , Zhao Qian Sheng , Hu Qing Xi
Published: August 2011

Post processing is one of the key technologies of CNC programming. Nowadays, the wide application of new type CNC machines is limited by the matching problem between the CAM systems and the developing CNC machine systems. This paper based on XDK9070 CNC engraving machine, researched the file format of cutter location files generated from Pro/Toolmaker and the CNC program format of FAGOR system, expounded the method and process for post processing, designed a special post processing procedure for FAGOR CNC system based on Visual C++, verified the correctness and practicality of the post processing procedure by a example of product processing.
Study on the Properties of Spherical Pore Porous Metal Prepared by Plastic Working
Authors: Zhang Li Zhong , Shi Guo Dong , Xu Lin Lin , Yu Yong Jiang , Zhao Xiao Jun
Published: August 2011

This paper reveals a preparation method of a new type of porous metal. Because of the high cost and low quality, the actual large-scale application of porous metal is not very widespread. The new manufacturing methods proposed by paper will enhance the practical application of porous metals. The hollow part of hollow metal balls can be used as the main body of porous metal to manufacture porous metal. First, a hemispherical-thin layer metal structure was obtained by plastic processing from a metal plate. Then, this metal structure was connected appropriately according to the body-centered cubic structure to from a new type of spherical porous metal. The method is simple, high productivity, easy control and low cost.
Microcantilevers Fabrication Process of Silicon-Based (Pb, La)(Zr, Ti)O3 Antiferroelectric Thick Films for Microactuator Applications
Authors: Yang Yu Hua , Zhao Zhen Yu , Guan Xin Feng , Chou Xiu Jian
Published: August 2011

(Pb, La) (Zr, Ti)O3 (PLZT) antiferroelectric thick films were deposited on Pt (111)/ Ti/SiO2/Si (100) substrates via sol-gel process. X-ray diffraction (XRD) analysis indicated that the films derived on Pt (111)/ Ti/SiO2/Si (100) substrates showed strong (111) preferred orientation. The Bulk and Surface silicon of micromachining process were employed in the silicon-based antiferroelectric thick film microcantilever fabrication, such as wet chemical etching for PLZT, inductive couple plasmas (ICP)for silicon etching, platinum etching and so on. Challenges such as Pt/Ti bottom electrode and morphology of PLZT thick film were solved, the integration of functional antiferroelectric materials and MEMS technology, provide a new way of thinking for the design and manufacture of micro-actuators.
Developing a Hybrid Stack Mode for Dynamic Yard Allocation Strategy of Export Containers
Authors: He Jun Liang , Mi Wei Jian , Chang Dao Fang , Bian Zhi Cheng
Published: August 2011

In this paper, a dynamic yard allocation strategy of export containers is proposed based on a hybrid stack mode. Firstly, a 0-1 programming model is developed for the problem. Accordingly, the model’s objective function is subject to the minimization of the total re-shuffle containers which are buried beneath other containers but heavier. To resolve the NP-hard problem regarding the dynamic yard allocation model, a hybrid algorithm, which applies heuristic rules and genetic algorithm, is then employed. Subsequently, a case study is used for system illustration. Consequently, it could be found from computational results that this approach paves a venue for resolving the dynamic yard allocation problem of export containers.
Yard Allocation Planning for Container Terminals Based on Twin 40ft Handing System
Authors: Chang Dao Fang , Jiang Zu Hua , Zhou Gui Qing , He Jun Liang
Published: August 2011

To solve the twin 40ft handing system for container terminal yard allocation, a rolling –horizon model of outbound container yard allocation planning is developed by the multi-objective planning method. Then a particle swarm algorithm is designed to obtain the optimum solution of the model. Finally, a numerical experiment shows that the proposed approach can solve the problem effectively.
The Three-Ply Analytic Approaches of Cycle Working Chart in Design of Automatic Packaging Machine
Authors: Wu Ruo Mei , Liu Dai An , Yu Jiang Hong , Xiao Ying Zhe
Published: August 2011

Movement of each executive mechanism of the automatic packaging machines is complicated. The packaging machine standard executive mechanism requests coordination between the movements each other and a strict machine operating cycle period is required. The paper assimilates conventional design knowledge about periodic diagram of the automaton and gives a very comprehensive analysis of the internal relation among periodic motions of executive mechanisms of automatic packaging machines, summarizes three periods: movement-period, coordination-period and integration-period. A new way began to form in the paper. Called as three-ply analytics, of which principle is conciseness, it easy to be popularized.
Ground Penetrating Radar Use on Tunnel Disaster Warning
Authors: Yang Cheng Zhong , Hu Ben Qing
Published: August 2011

The geological conditions of Tunnel are of complexity, variability and uncertainty,So it is a necessary guidance to accurately predict the specific type of adverse geological,the location and the size in front of the tunnel.This article take the Separate tunnel in Hebei province as the background, describes the basic working principles of the Ground Penetrating Radar System and the testing method in the tunnel geological prediction,uses the Ground Penetrating Radar needle to predict adverse geological disasters.and make specific explanation for the targeted radar images. The characteristics of Ground Penetrating Radar are that it does not affect the construction,it is nondestructive, fast and convenient, easy to operate.
Development and Test Study of a New Classification Equipment for Bauxite Desiliconization
Authors: Lu Dong Fang , Wang Yu Hua , Sun Wei , Lu Dong Liang , Hu Yue Hua
Published: August 2011

In this paper, a new classification equipment for Bauxite desiliconization is introduced, which combines Centrifugal with gravity and it can separate diaspore and slime effectively in a composite force; The flow field in the equipment was simulated by Fluent software for explaining separation process and principle; the laboratory experiments and pilot tests had been finished on this kind of device, showing that a concentrate with Al2O3 recovery of 90.64% and Al-Si ratio of 6.34 was obtained from the feed with a Al/Si ratio of 4.7 based on one stage desiliconization separation; the pilot tests show that new classification equipment for Bauxite desiliconization can increase the concentration with Al2O3 recovery by 1.59 percent and Al-Si ratio by 0.19 and degrease the Al-Si ratio of tailing by 0.39. The separation index of the new separator is better than the general separator obviously.
RFID-Enabled Real-Time Production Tracking System for PCB Assembly Industry
Authors: Zhang Gong , Zhang Jie , Tian Shi Yong
Published: August 2011

There are many varieties of materials and suppliers for the PCB assembly process; meanwhile, process modifications as well as order changings happen frequently during production. The PCB assembly industry is suffering uncertainty and unknowingness due to the lack of timely, accurate, and consistent production data. Therefore, real-time production information tracking plays an important role for the PCB assembly industry, which provides the right information to the right person at right time to support the decision making and optimize the production management. This paper applies RFID technology to capture the production data and process production information for PCB assembly enterprises. In a PCB assembly line, machines and materials are equipped with RFID device such as RFID readers and tags to build the real-time data collecting environment. A number of production information processing methods are proposed to extract the production tracking information such as progress, WIP (Work-in-progress) inventory from the mass real-time data through data filtering and selection. Finally, a case study is given to demonstrate the developed methodologies.
Subpixel Edge Detection Algorithm of the Glass Bottle Based on Zernike Moments
Authors: Yang Hao , Pei Lei
Published: August 2011

The accuracy of edge detection determines the accuracy of actual dimension measurement，in order to improve the measuring accuracy, this paper proposes a fast algorithm of detecting the glass bottle dimension based on Zernike moments. Firstly, combines the traditional Zernike moment-based method with Otsu adaptive threshold algorithm and a new fast algorithm for edge detection is proposed. Then uses this fast algorithm to detect the edge of glass bottle with subpixel-level and uses the least square method to fit ellipses formed by the glass bottle mouth and bottom. Calibrated the system with standard gauge block and obtain the actual dimension at last. Experimental results show that the improved algorithm not only can make the edge detection reach the subpixel-level accuracy, but also can avoid the edge misidentification and inefficient causing by repeatedly manual adjustments to select the threshold value when detecting the edge. Making a rapid, accurate, non-contact measuring system becomes a reality.
Theory and Experiment Study of Normal Penetration of Slender Nose Projectile into Steel Target
Authors: Huang Guang Yan , Wu Guang , Feng Shun Shan , Zhou Tong
Published: August 2011

Partial penetration means partial body of projectile is in target, the other out of target. Analysis model of slender nose projectile partial penetrates steel target is proposed base on cavity expansion theory (plate thickness is smaller than projectile nose length), and the variation relation of penetration depth with initial velocity is concluded when projectile partially penetrates steel target. Penetration tests are carried out on hard projectile penetrates steel target, and the predicted results of penetration depth have good agreement with experimental results.
Interface Performance Analyses of Electrodeposited Nickel Coating on ABAQUS
Authors: Huang Xia Chun , Wang Han Yu , Zhou Li Qun
Published: August 2011

In this paper, ABAQUS was used to simulate the stamping process for electrodeposited nickel coating. In the simulation, a built-in cohesive zone model of ABAQUS was used to present electrodeposited nickel coating steel‘s interface performance. The computational results shows that, at the interface, the normal stress was between -113.765～3MPa，and the maximum tangential stress is 50 MPa. The maximum interface stress is at the die fillet during the process of stamping，and we analyze the case of delaminating and is used to assess the influence of the blank holder force，the clearance between the punch and the die and the tool radii. This method can be used as guidance for battery shell’s forming manufacture.
Preparation and Properties of CrN/NbN Nanomultilayers by Dual-Target D.C. Reactive Magnetron Sputtering
Authors: Shan Yu Qiao , Liang Bao Qi
Published: August 2011

In this work, CrN/NbN nanometer multi-layers were deposited on the metal substrates by a dual-target DC reactive magnetron sputtering system. X-ray diffraction, Scanning Electron Microscope and Energy Dispersive Spectrometer were used to analysis the phase composition, crystal structure, surface morphology, fracture morphology and elemental composition of thin films. Micro Hardness Tester and wear-resistant experiments were used to test the hardness and wear properties of the films.
Temperature Field Simulation of Pure Al Solidified by PTC Method and PTC Medium
Authors: Zhang Lian Yong , Ma Zhuang , Sun Fang Hong , Jiang Yan Hua
Published: August 2011

Phase transition cooling (PTC), using the absorbed latent heat during the melting of phase transition cooling medium to cool and solidify alloys in the process of casting, is a new casting technology. Specimens of pure Al were prepared by this method in the paper. The temperature field of the casting was simulated with Ansys software. Parameters which affect the process of solidification were simulated too. The results showed that the pouring temperature of melt and the amount of phase transition medium have great effect on the process of solidification.
The Role of Electric Current on Friction and Wear Behaviors of the Carbon Strip/Copper Contact Wire
Authors: Ding Tao , Chen G.X. , Xiong Z.G. , Xie Li , Wu C.X.
Published: August 2011

A serial of experiment studies on the friction and wear behaviors of the carbon strip/copper contact wire under the electric current were carried on the pin-on-disc tester. The results indicated that the tribology performances were remarkably affected by the electric current. The friction coefficient decreases with an increase of electric current. However, the were volume increases with increasing of electric current, and the worn surface of carbon strip become severer and severer with the increasing electric current. Therefore, the electric current play roles of lubrication and accelerating wear in the process of electrical sliding friction. By the analysis of EDX, it is seen that the oxide wear exists in electrical sliding friction process. Observing the worn surfaces of copper pan sample, it is found that the electric current increases the material transfer of carbon strip.