bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Bio-Rapid Prototyping System for Fabricating Bone Scaffold Using Thermal-Sensitive Biopolymer
Authors: Chen Yo Yu , Jiang Cho Pei , Chen Chang Cheng
Published: March 2012

The paper aims to develop a bio-rapid prototyping system based on air pressure-aided deposition technique for fabricating scaffolds with pore size in the range of 50 to 420 µm. The material used are thermal-sensitive polymers consisting of poly(ethylene glycol) and poly(-caprolactone), and synthesized with different molecular weights for investigating the viscosity effect on deposition stability in regarding to varying scanning speed. The experimental results show that at the molecular weight of 10,000, the molten form can be stably deposited through a heating nozzle at an air pressure of 0.3 MPa and no crack occurs after it solidifies. The scaffolds with mean pore size of 420 µm (porosity 89%) were fabricated and its average compressive strength was 9.28 MPa. The study also suggested that the developed bio-rapid prototyping system is suitable for fabricating micro-porous cellular scaffold, especially for thermal-sensitive copolymers.
Influence of the TMJ Implant Geometry on Stress Distribution
Authors: Arabshahi Zohreh , Kashani Jamal , Kadir Mohammed Rafiq Abdul , Azari Abbas
Published: March 2012

The purpose of this study was to investigate the influence of Temporomandibular Joint implant geometry on stress distribution in total reconstruction of temporomandibular joint. A three dimensional model of a lower jaw of a patient was developed from a Computed Tomography scan images. Anatomical curvature and flat contact surface of implant design and fixation screws were modeled. Two implanted mandibles were then compared by means of finite element analysis. The muscle forces for incisal clenching were applied. The equivalent stress resulted in contact surface region of the bone and implant and in fixation screw holes were investigated to evaluate the designs. In applied loading condition, The results showed that anatomical design of implant was more preferred and it will lead to long-term success of implant.
Design Analysis of TMJ Implant under Physiological Loading Condition
Authors: Arabshahi Zohreh , Kashani Jamal , Koloor S.S.R. , Kadir Mohammed Rafiq Abdul , Azari Abbas
Published: March 2012

Equal channel angular extrusion (ECAE) is a severe plastic deformation (SPD) method for obtaining bulk nanostructured materials. The ECAE die consists of two equal channels that intersect at an angle, usually between 90。and 135。. In the present study, the plastic deformation behavior of copper during the ECAE process with 120o die was investigated. To analyze the deformation behavior and the related strain distributions in the specimen, the commercial FE code ABAQUS has been used. The properties of the materials are strongly dependent on the shear plastic deformation behavior during equal channel angular extrusion (ECAE), which is controlled mainly by die geometry, material properties, and the friction between billet and the die. The ECAE process for these conditions was explained using the two different friction conditions of 0.15 and 0.08 to all sliding surfaces. The effective strain by the theoretical equation is in good agreement with the FEM results.
Analysis of the Key Technologies and Information Security of the 220kV Digital Information Substation
Authors: Cai Gui Hua , Song Tian Min , Wang Zhi Gang
Published: March 2012

Due to its unique advantages in the construction, operation, maintenance and management and other aspects, the digital information substation has achieved rapid development in China in recent years, and many areas are conducting the pilot actively. According to the design features of the Baiyangdian 220kV digital information substation in Baoding City of Hebei Province in China, this paper analyzes some key technologies in the engineering design and implementation. The digital substation is mainly hierarchically constructed by the optoelectronic transformer, the intelligent primary devices and the network secondary devices on the basis of IEC61850 communication protocol, and it is the modern substation that can achieve information sharing and interoperability between the devices. Finally, the paper proposes solutions to the information security issue of the digital information substation.
Experimental Investigation of Rotor Rubbing Faults
Authors: Liu Gui Zhen , Chen Ya Zhe , Liu Yang , Wen Bang Chun
Published: March 2012

Established a single-disc rubbing rotor system test-bench ,and can simulate the design of a single point of rubbing and rubbing of the rotor part. In the case of constant speed to ensure that observed in the rubbing rotor vibration under different conditions, the use of waveform, frequency spectrum, Orbit and other detailed analysis of the system before and after rubbing and chaotic properties of nonlinear response the experimental. results show that the occurrence rub rotor system, the system will stimulate a high frequency and fractional-octave, when there will be a serious rub chaos.
Lifetime Computational Models of Rolling Bearings in a 1.5MW Wind Turbine’s Epicyclic Gearbox
Authors: Tan Xin , Li Yao , Yang Jun Jie
Published: March 2012

This paper introduces a computational model for calculating the lifetime of rolling bearings in a 1.5MW wind turbine’s epicyclic gearbox. At first, a quasi-dynamic model is established to analyze the skidding of bearings and the skew of rollers. Then, the load distributions on raceways and inner rings of bearings are calculated using the quasi-dynamic model. Meanwhile, a multi-body finite element model established in RomaxWind software is utilized to simulate and analyze dynamics behaviors of the epicyclic gearbox including all bearings. The comparison of bearings’ lifetimes calculated with different methods shows that the quasi-dynamic model can obtain very close results as the multi-body finite element model obtains, but costs less time. Failures occurring on inner and outer rings, such as pitting, adhesion, are mainly resulted from the misalignment of inner rings and roller number on the skidding of bearings
Measures on the Impact-Spread of Road Accidents
Authors: Zhang Han Xin
Published: March 2012

Road safety system has been a concern topic for many scholars worldwide. Although there are many analysis papers on road traffic accident prevention, security, emergency rescue, safety evaluation and other aspects, there is no a thorough and complete opinion on road safety system. The study of these issues can cause a traffic accident prevention, to reduce the incidence of traffic accidents, summing up the spread of some of the impact of traffic on the control of the effective ways to combat the public security organs to reduce the incidence of traffic accidents guidance.
A New Vanishing Point Detection Algorithm for Orthogonal Directions
Authors: Fu Mao Li , Zhao Can , Cheng Jun Ting
Published: March 2012

This paper presents the orthogonal direction vanishing points detection algorithm for scene image. It use the Hough transform to detect straight lines in the image, then it based on RANSAC robust framework to calculate the initial value, the end use of Levenberg-Marquardt algorithm for nonlinear optimization iteration to strike the final vanishing point. The experiments result shows that the algorithm can not only quickly detect scene orthogonal direction vanishing points, but also high-precision and that respected this method suitable for use in a scene with large buildings or hyperopia scene.
Large Stroke Series Compliant Mechanism
Authors: Shan Ming Cai , Wang Wei Ming , Ma Shu Yuan , Liu Shuang
Published: March 2012

To increase the stroke of precision positioning system, a novel series compliant mechanism is presented which is based on elliptical flexure hinges. Pseudo-rigid-body model and energy method are applied to establish the theoretical model of stiffness and maximum stress, which are critical parameters for the large stroke compliant mechanism. The relationships are analyzed between geometric parameters of the series complaint mechanism, stiffness and maximum stress. According that, the series compliant mechanism is designed with the stroke more than 5mm and stiffness less than 3.2N/mm. The difference is less than 5% between the results of finite element analysis and theoretical model computation, which proves the correctness of the application design.
Development of Instrument Cluster Simulation System Based on Canoe
Authors: Li Lan Jun , Ye Heng Jie , Gao Song
Published: March 2012

A simulation system for instrument cluster based on the CANoe from Vector company is developed and used for real-time cluster test and fault analysis. Test results show that the operation condition of cluster can be simulated and the fault data from CAN bus can be collected, replayed and analyzed using this system.
Heat Transfer Simulation and Optimization of Cooling System for Micro Wankel Engines
Authors: Gou Yun Jun , Zhong Xiao Hui
Published: March 2012

A jet cooling system is designed for micro Wankel engines in laboratory environment. The heat transfer on the wall of engine is simulated with FLUENT, from the simulation results we can see that the cooling effect of jet cooling system is good, it can meet the needs of wall temperature. This paper is helpful for the cooling of micro engines in laboratory environment.
Characteristics of Electromagnetic Waves Propagation in Corridor for High-Rise Buildings
Authors: Li Xiang Jiang , Fan Jing
Published: March 2012

With the popularity of wireless communication systems, the question of radio signal coverage is getting more and more attentions in corridor for high-rise buildings. Using loss rectangular dielectric waveguide theory, the attenuation of electromagnetic wave transmission rate is calculated in theory. Because of the complexity of electromagnetic waves propagation conditions, site measurement of transmission loss is done in band 210MHz, 460MHz, 1.2GHz and 2.0GHz. Measurement results show that the wireless signal transmission loss rate is similar with the calculation of loss rectangular dielectric waveguide theory on the trend
Bearing Fault Diagnosis Based on Dual-Tree Complex Wavelet Transform
Authors: Li Hui
Published: March 2012

A novel method of bearing fault diagnosis based on demodulation technique of dual-tree complex wavelet transform (DTCWT) is proposed. It is demonstrated that the proposed dual-tree complex wavelet transform has better shift invariance, reduced frequency aliasing effect and de-noising ability. The bearing fault vibration signal is firstly decomposed and reconstructed using dual-tree complex wavelet transform. Then the real and imaginary parts are obtained and the vibration signal is amplitude demodulated. In the end, the amplitude envelope and wavelet envelope spectrum are computed. Therefore, the character of the bearing fault can be recognized according to the wavelet envelope spectrum. The experimental results show that dual-tree complex wavelet transform can effectively reduce spectral aliasing and fault diagnosis based on dual-tree complex wavelet transform can effectively diagnose bearing inner and outer race fault under strong background noise condition.
Determination of the Total Ginsenosides in Ginseng Using the UV Spectrophotometer and Evaluation of the Measurement Uncertainty
Authors: Zhang Min , Qin Yu Xia Jane , Chen Dan , Yang Ping
Published: March 2012

Using the Ultraviolet Visible Spectroscopical Photometry method, the Ginsenosides content was detected, and evaluated the measuring uncertainty of the Ginsenosides content, analyzed the main source of the uncertainty components, finally evaluated and calculated the uncertainty components. The results showed that, when the Ginsenosides content is in the range of 20-120g, there is a good linear relation, and the linear equation is A=0.0216+0.00556C, r=0.9961 (coefficient correlation). For example, when the content of Ginsenosides is 4.60%, the expanded uncertainty of Ginsenosides measurement is U=0.408%, the coverage factor is 2 (k=2). This study provides a reliable theoretical basis for an effective and high quality method of Ginsenosides content measurement
A New Hardware-in-the-Loop Test System for Electronic Control Unit of Dual-Clutch Transmission Vehicle
Authors: Chen Ran , Mi Lin , Tan Wei
Published: March 2012

Hardware-in-the-loop simulation (HILS) is a scheme that incorporates some hardware components of primary concern in the numerical simulation environment. This paper discusses the implementation and benefits of using the HIL testing system for electronic control unit of dual-clutch transmission (DCT) vehicle.
Detecting Object by Affine Transform Using Line
Authors: Li Jing , Liu Huai Yu , Hong Liu Rong
Published: March 2012

Hough transform is an effective way in object recognition and applied to many industrial processes. Based on the principle of Hough transform, a new algorithm which can detect objects through an affine transform was proposed in this paper. First, application of Hough transform to extract straight lines in a model image and a scene image, got these coordinates of the lines, sorted according to the direction angle. Because of affine transform and the periodic direction angle, the direction order of the lines on scene image were different from those on the model image, these lines on scene image were expanse a cycle. Finally affine transform parameters were applied to objects detection. The results showed the effectiveness of the algorithm.
Feedback Filter PID Control for Integrator and Time Delay Processes
Authors: Tang Wei , Ji Xiao Xiang
Published: March 2012

A PID controller based on a typical feedback model is introduced because of instability of a kind of integrator and time delay process on open-loop condition. All-pole-type approximating method is adopted to deal with delay part of the controlled object approximately,and confirmed parameters of PID controller is obtained by importing a strategy of confirming parameters of PID controller based on a kind of typical feedback model from IMC principle.The designed control method shows better set point tracking performance based on initialed parameters point and better interference suppression performance of the controlled object.The structure of the controller is simple, and parameters are easy to adjust, the improved controller is easy to apply to practical projects.The simulation results show its effectiveness
An Extensional Clustering Algorithm of FCM Based on Intuitionistic Extension Index
Authors: Liu Qing Feng
Published: March 2012

The fuzzy C-means algorithm is an iterative algorithm in which the desired number of clusters C and the initial clustering seeds has to be pre-defined. The seeds are modified in each stage of the algorithm and for each object a degree of membership to each of the clusters is estimated. In this paper, an extensional clustering algorithm of FCM based on an intuitionistic extension index, denoted E-FCM algorithm, is proposed. For comparing the performance of the above mentioned two algorithms, the experimental results of three benchmark data sets show that the E-FCM algorithm outperforms the FCM algorithm.
A Novel Traffic Prediction Method Based on IMF
Authors: Gao Qian , Li Guang Xia , Tian Xiang , Sun Jian
Published: March 2012

This paper proposes an IMF-based traffic prediction method. According with the characteristics of each IMF (Intrinsic Mode Function), different models are adopted for the prediction of IMFs. Experiments are carried out based on real traffic. And the experimental results show that the proposed method not only solves mode mixing but also increases the prediction accuracy.
An Optimization Model for Aircraft Maintenance Scheduling Based on ABC Algorithm
Authors: Jiang Ling Ping
Published: March 2012

The problem of airline maintenance scheduling is considered in this paper. A maintenance-scheduling model that can determine rational maintenance date is established, in this model, while aircraft materials as well as other factors are taken as constraints, and aircraft air-on-ground (AOG) loss is set as goal function. In order to solve the model, Artificial Bee Colony (ABC) algorithm is utilized by setting the appropriate number of the bees, which can find the optimal solution rapidly. Finally, airline’s practical data is applied to validate the feasibility and practicality of the model and ABC algorithm.
Transformer Winding Deformation Fault Diagnose Based on FRA and Energy Feature Extraction by Wavelet Packet
Authors: Qian Su Xiang , Du Qi , Gu Xiao Jun , Song Jia You
Published: March 2012

When different types and extent of faults occurs at transformer winding, the energy of the signals in different frequency bands will change. So it can calculate the characteristic energy of different response signals at different states to determine whether the winding failure. The transformer fault diagnosis method based on FRA and characteristic energy extraction is presented, the maximum cross-correlation between the signal and the wavelet was taken as criterion to choose the wavelet. The method is verified by test. Experimental results show that this method can diagnose winding fault type and extent effectively, and improve the sensitivity of fault diagnosis.
Study on EGR Control Strategy for Vehicle Diesel Engine Based on Experiment
Authors: Liu Yong Feng , Pei Pu Cheng , Yang Jian Wei , Zhu Ai Hua
Published: March 2012

To carry out electronic control EGR strategy in diesel engine the calculation model using GT-POWER is built. The thesis uses simulation software GT-POWER to establish the calculation model of 4JB1 intake system of turbocharged diesel engine with EGR system and the results agree well. According to the simulation results, it can predict the main performance indicators of the diesel engine when it works at the maximum torque condition, which includes A/F, IMEP, Maximum Pressure, and Intake Pressure and so on. Then after controlling the volume of gas by modifying the EGR valve, it can find out the regulation how EGR effects the engine's emissions, torque, power and the inlet temperature of turbo. Referring to the simulation results, it includes from four aspects：EGR can significantly improve the quality of emission gas; NOx and PM have a trade-off relationship; applying higher EGR rate in heavy load can lead to the low torque and power less; the inlet temperature of turbo increases with the augment of EGR rate. In the experiment, the inlet oxygen concentration method is used to determine the EGR rate, and to realize it, the oxygen concentration detection module is also successful designed. Then a close-loop control strategy is proposed based on the EGR rate. It proves it is feasible to guide the ECU programmer development by the simulation results of engine control strategy. It is also can be referred by other engine control systems development.
Study on Boring Small Hole of Stainless Steel Dryly by Ultrasonic Vibration Double Cutter
Authors: Zhang Jian Zhong , Wang Xin , Zhang Yue
Published: March 2012

It has been one of the difficulties that high-precision small hole on stainless steel is machined. The supersonic vibration boring acoustic system is installed in the lathe. The supersonic wave energy applies to tool to create pulse power on the cutting process. The separation vibration cutting is achieved by the pulse force. The comparative tests on boring surface quality are carried. The quality of surface machined by this method is compared to that by grinding. This cutting is the green cutting. The boring process system is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration boring dry cutting of stainless steel are also summarized. The test results show that the ultrasonic vibration boring by double cutter is of very superior cutting mechanism and is a high-precision thin - long deep - hole machining of stainless steel materials, efficient cutting methods.
Research and Design of the Remote Fault Diagnosis System for Complicated Equipment Based on Intelligent IETM
Authors: Sun Han Bing , Xu Zong Chang , Zhou Jian
Published: March 2012

The significance of building the remote fault diagnosis system for complicated equipment based on intelligent IETM was analyzed. And then the concept of intelligent IETM was introduced. Finally, overall objective, main function and architecture of the system were elaborated .
The Design of GPS Digital IF Signal Simulator
Authors: Zhang Bei
Published: March 2012

This paper focuses on the study of digital IF signal simulator's Matlab implementation on the basis of GPS system and GPS navigation signal simulator.It includes the simulator's parameter settings (such as the sampling rate,intermediate frequency), then calculates the sampling signal's code phase and carrier phase by determining the signal's propagation delay. In addition,it introduces and simulates the ionospheric model and the tropospheric model,and corrects the sampling signal's code phase and carrier phase.This paper realizes GPS digital IF signal simulator's Matlab simulation,thus it provides the supporting platform for research,development and testing of the GPS receiver's new algorithm
Research on Fire Detection in Coal Mine Based on GA-Improved Wavelet Neural Networks
Authors: Zhao Hong
Published: March 2012

In coal mine the forecast on fire is mainly based on the smoke, gas and temperature parameters to recognize, and sometimes it has leak check and wrong check, therefore a novel method for mine fire based on image processing is presented. First the data are obtained by infrared CCD, then the blaze characters are extracted and they are entered into the GA-improved wavelet neural networks model after being quantization, finally the fire can be detected. The experiment results show that this method can recognize fire signals and it reduced leak forecast, and also it is more reliable and has stronger antigambling ability. It will inevitably play an important role in coal mine safety production..
Transient Dynamic Analysis of Mechanical Structure of Multi-Axis Force Sensor and Measuring Circuit Coupling System
Authors: Feng Hui Min , Song Fang Zhen , Song Bo
Published: March 2012

The transient characteristics of mechanical structure of multi-axis force sensor and measuring circuit coupling system is an important index of evaluation of the precision of the maglev system based on the force control. The dynamic model of mechanical structure and coupling system is established. The transient responses curves of mechanical structure and coupling system are obtained through simulation and their transient performances are analyzed respectively. Comparing transient responses of mechanical structure with coupling system, it is shown that maximum overshoot of coupling system is smaller; oscillation number of response curve is less in the settling time; response rise time, peak time and settling time of coupling system is 0.014s, 0.048s and 0.021s respectively. The above data further show that transient characteristics of coupling system can satisfy the control precision of the maglev system
Air Targets Recognition Based on Feature Analysis and Particle Swarm Optimization K-Means Clustering
Authors: Wang Shao Lei , Chen Wei Yi
Published: March 2012

The threat which the formation of ships will face is much more complex and various than ever before. To recognise targets right and fast is the precondition of air defence. On the basis of analysing the information from surveillance radar, the target recognition of fleet air defence is translated into optimal clustering problem, and the model for identifying air-targets is established. Through standardizing the attribute values of samples and then the Principal Components Analysis(PCA) and Particle Swarm Optimization(PSO) is introduced and the best solution is established. With the advantage of PSO's intelligent searching mechanism, global optimization, robustness and strong classification ability, the model can deal with such problems simply quickly and correctly，and help the commanders make decisions effectively.
Stage Boom Machinery Control Based on Adaptive Fuzzy PID
Authors: Luo Dong Song , Wu Shao Fei
Published: March 2012

Aimed at the variable speed and real-time problems in stage boom machinery control, the practical problems of great error, bad real-time, difficult zero speed park in fixed speed control has been solved effectively by adaptive fuzzy PID control. Based on the characteristics of the stage boom operation, a combined configuration of lower acquisition module and upper controller are applied to the control system, the upper controller sends the running parameters to the lower controller through the industrial Ethernet. The lower controller calculates output by adaptive fuzzy PID and communicate with inverter through CAN bus, then variable speed control in stage boom control can ben achieved by variable frequency. Unique degree value encoder is used to feedback the real-time information to the lower controller. System testing results showed that the method could improve the control performance and realize the variable speed control and zero speed park of the stage boom machinery
Aero-Engine Condition Monitoring Based on Kalman Filter Theory
Authors: Gao You , Wang Nan
Published: March 2012

The maintenance and management of civil aero-engine require advanced monitor schemes to evaluate aero-engine health and condition in order to ensure safety of aircraft and increase life of aero-engine. In this paper, we adopted Kalman filter approach to monitor an aero-engine health and condition by building prediction models of main aero-engine performance parameters (EGT, N1, N2 and WF). The AR model is introduced into the Kalman filter equations, which is a helpful technique to improve the accuracy of monitoring models of performance parameters. When the relative error goes beyond ±0.3%, alarms will be given. The prediction results show that Kalman filter theory using for AR regression prognostic is an effective approach in aero-engine monitoring.
Research on Fault Knowledge Acquisition Base of Circuit Simulation
Authors: Tao Gui Ming
Published: March 2012

To resolve bottle-net problem of knowledge acquisition of fault diagnoses expert system. This paper make use of circuit simulation software Multisim2001module modeling and simulating, acquiring fault data of electric control circuit of missile launching vehicle, acquiring correspondence relation of function-fault, establishing knowledge base of intelligent diagnostic expert system, affording a new thought to resolve knowledge acquisition of expert system. The fault diagnosis expert system is based on the knowledge base, but many fault diagnosis expert systems face the same problem: the knowledge of fault and fault maintenance is very poor. This causes many of intelligent fault diagnosis systems are still in the theoretical research or prototype design stage, and its use value is low, therefore, how to gain more significant and enough knowledge has turned to be the bottleneck which confine the engineering operational capability of fault diagnosis system[1] . This article will build an electrical system dynamic operational model of some equipment by circuit simulation. And it will do the direct current analysis, transient analysis etc. for the circuit by the software’s powerful analyze ability, include the setting of some devices’ voltage value, current value and test point, and gain the simulation parameters of normal conditions and fault conditions. Then lead these data into the database so as to the system to call and search, and confirm the fault node finally [2, 3]. The function simulation which is mentioned in this article is an ingredient of the equipment system simulation; structure simulation and movement simulation are also like it. And it contains system-level simulation, part-level simulation and component-level simulation in the hierarchical division. Because of the limited space, this article just considerate the electricity circuit simulation’s application in the fault knowledge acquisition, which is belong to the function simulation.
Rapid Foreground Extraction Algorithm Based on Trimap
Authors: Zeng Shao Wei , Liang Zhu
Published: March 2012

Foreground extraction is a very important operation in the image processing of the computers. Its purpose is to extract the area that human beings are interested in from the complicated background, which is beneficial for the subsequent operations such as background exchange, changes of the perspective effect and image mosaicing and so on. However, it is actually an ill-posed problem to determine whether a pixel belongs to the foreground. It is usually hard to acquire an accurate solution from the initial image. Therefore, the foreground extraction algorithm generally needs the user interaction. This paper has put forward a kind of rapid foreground extraction algorithm with the user interaction form of Trimap. On the one hand, our Trimap is quite simple. The users are able to understand the influence of Trimap on the productive resultants visually. On the other hand, with the help of Trimap, we are able to lessen the area that needs to be calculated in a large degree, which can rapidly finish the work of foreground extraction.
Design of Passive Acoustic Location System Based on Double Arrays
Authors: Fang Li Qing , Wang Hong Kai , Chen Kai
Published: March 2012

The biggest advantage passive acoustic positioning system based on single array is that it has high performance on orientation. However, its positioning error is usually larger. Locating based on multi-array not only gives more information to enhance the locating accurate, but also can eliminate the blind area generated by single array. So its locating performance is better than single-base array. In this paper, taking the system of double arrays for instance, built a passive acoustic positioning system, gave the plan of the system, and designed the tests to compare the accuracy between the single array and double arrays. According to the tests, it further verified that locating system based on double arrays has higher accuracy than the system of single array. And it also has high value engineering.
Analysis for Blade with Centrifugal Preload under the Impact Stress Wave
Authors: Yin Dong Mei , Li Zhen Xiao
Published: March 2012

Foreign object damage of engine blades often occurs when they are working with high rotating speed. Nonlinear finite element models for foreign object damage of blades with different centrifugal prestress were established. And the initializations of stress and displacement field for blade due to centrifugal preload were obtained by the dynamic relaxation method in the beginning of the dynamic analysis of impact. The effect mechanism of centrifugal stress on the foreign object damage of the blade was also investigated based on the impact theory of prestressed Timoshenko beam and the principle of stress wave propagation. The results indicate that the local plastic deformation on the impact location of the blade with centrifugal preload, which is produced at the moment of impact, is decreasing with the increase of preload. Attenuation speed of compressive stress wave, which is produced by the moment of impact on the blade face, is reducing with the augment of preload.
Comprehensive Quality Evaluation Oriented to Product Lifecycle
Authors: Jiang Xing Yu , Xu Long Zhen , Sun Xue Yan , Wang Shi Jie
Published: March 2012

Seeing that the influence quality factors of product lifecycle are multi-object, multi-level, interconnection and interaction, which possess uncertainty and fuzziness obviously, in order to product quality, quality evaluation mathematical model based on Fuzzy Analytical Hierarchy Process (FAHP) and Fuzzy Comprehensive Evaluation (FCE) is proposed to evaluate product quality. This method introduced the triangular fuzzy number to represent experts’ judgment information of product quality and used the AHP to rank these influence quality factors. At last, FCE is used to make the results of product quality evaluation more scientific and effective. The product of some Heavy Machinery Enterprise (coal grinding mill) is introduced as an example to demonstrate the rationality and validity of the method.
Comparative Study on the Earthquake-Proofing Performance of Chinese and Japanese Building Structures
Authors: Wang Yu Dong , Zhang Wen Shuai
Published: March 2012

In recent years, there were frequent earthquakes happening in China. These earthquakes have give rise to a high degree of casualties. However, compared with Japan in which the number of the earthquakes is the highest in the world, China's earthquake-proofing legal standards, requirements on the earthquake-proofing designs and the rate of the earthquake-proofing technologies as well as understanding of the structure of the building are not under the immature state at the present time.
Effect of Die Radius and BHF on Formability of the Corner of Box-Shaped Parts in Deep Drawing Processes
Authors: Chen Kang , Peng Cheng Yun , Li Bao Bao , Liu Hui
Published: March 2012

Formability of the corner in the deep drawing of box-shaped parts was studied. The forming of box-shaped parts was simulated through numerical simulation software DYNAFORM from the different die radius size of shoulders and corners, the different BHF of straight and curved edges and different materials, etc.. The results shows that, the forming limit height of box-shaped parts increases with the larger the die radius of shoulders and corners, and forming limit height of SS304 in the materials studied is the highest, because it has larger yield strength; If the BHF of straight and curved edges has the constant size, the forming limit height of box-shaped parts will be lower when the BHF increases, while forming limit has a clear upward trend as blank holder force increases in the deep drawing processes which accords with the change law of resistance during the dislocation movement.
Design and Compiling of Laser Propagation Simulation Software in Atmospheric Environment
Authors: Zhao Tong Gang , Zhang Zhi Qiang
Published: March 2012

As development of laser technology, the characteristic of laser atmospheric propagation is always hot spot in laser domain. Using theoretical models of laser atmospheric propagation, a simulation system is researched by implementing a scientific method of software development. This simulation system can simulate the radiate property of laser propagation in atmosphere, and demonstrate the course of laser propagation. This theoretical model of atmospheric propagation is based on Lambert-Beer law, combined with other classic theoretical model such as Rayleigh scattering and Mie scattering. Multiple scattering theories are used when simulating the laser propagation in smoke or fog. In calculation, the atmosphere is divided into layer. An appropriate model will be selected for calculation in each layer in order to enhance the stimulation precision. Lastly, the figure of light spot is drawn along with transmission space. Laser atmospheric propagation is demonstrated.
Design of Broadband Response Two Degrees of Freedom Piezoelectric Vibrator for Energy Harvesting
Authors: Liu Shao Qiang , Peng Jun Xian , Peng Min Qiang , Fan Xiao Ping
Published: March 2012

Piezoelectric vibrator is the core of ambient energy harvesters utilizing piezoelectric effect. The developed piezoelectric vibrators are generally one degree of freedom (DOF) vibration systems with narrow resonant frequency bandwidth, which restricts the energy harvesting efficiency. This paper studies a design of two DOF piezoelectric vibrator consisted of two single DOF vibrators and a connecting spring to extend the resonant frequency bandwidth. By adjusting the structural parameters, two natural frequencies of the vibrator are set to adjacent values, so that it can maintain a high response rate over a wide frequency range near its two resonance points. Structural parameters for maximizing the power output of the vibrator are optimized by using ANSYS software. Contrastive analysis between a typical cantilevers array and the proposed vibrator is performed. The results show that the proposed vibrator has better broadband response and the design scheme is effective.
Load Sharing of Parallel Shaft Split Torque Transmission System
Authors: Zhao Ning , Wang Rui Feng , Tao Li , Jia Qing Jian
Published: March 2012

Parallel shaft split torque Transmission system Split torque Load sharing Abstract: The Newton method was applied to develop a system of equations of motion, the mathematical model includes stiffness of shaft supporting, position of gears, backlashes, time-varying stiffness, composite transmission errors, damping. The model was solved by variable step size forth/fifth-order Runge-Kutta method. The load sharing was affected obviously by asymmetry of gear backlashes, stiffness of shaft supporting and gear position
Green-Efficiency Assessment of Chinese Industry Based on Principal Component Analysis and Super-Efficiency Data Envelopment Analysis
Authors: Liu Rui Jie , Zhang Zhi Hui
Published: March 2012

Industry is playing an important role in national economy, the efficiency and developing trend of which is widely being paid attention to. However, severe environmental problems always emerge along with rapid industrial development at the same time. Based on the method integrating Principal Component Analysis and Super-efficiency Data Envelopment Analysis, this article introduces environmental factors into the system to evaluate Chinese industrial green-efficiency of year 2000~2008, indicating the current major problems which hinder coordinated economic-environmental development of Chinese industry, and putting forward the improving direction.
Design of One Portable Maintenance Auxiliary Equipment
Authors: Wang Lian Sheng , Li Ting Jun , Fan Hui , Liang Fa Mai , Sheng Wen Ping
Published: March 2012

According to the characteristic of abounding use of digital information in the domain of maintenance of equipment, design a sort of PMA system which is high efficient, low dissipative and convenient to operate. The system is consisted of free scale i.MX51 embedded microprocessor, that its core is the newest ARM Cortex-A8 chip, and Windows CE operating system. Therefore, it achieved various functions, such as interactive query of IETM, sampling video and audio information, analysis fault, downloading and examining the maintained tasks and records
Programming Methods Research for the Non-Circular Curve - The Oval, for Example
Authors: Xu Xin Jian
Published: March 2012

The non-circular curve of manual programming commonly used macros. In this paper, oval, for example, studied the establishment of the principle of non-circular curve in a typical instance of the ellipse is given on the basis of the rough finishing process, and then summed up the oval processing considerations, and finally gives the conclusion of non-circular curve processing
Research of Manufacturing Strategic Decision Based on the Competitive Strategic Situation Cognition
Authors: Yang Yang , Guo Xing Bo
Published: March 2012

This paper studies manufacturing strategic based on the market orientation of strategy. This paper proposes the decisions of manufacturing strategy of companies are based on the managerial cognition of the competitive strategic situation. The respective and interaction effects of the two key factors, the trend and the existing competitive priority, on manufacturing strategic decisions. Empirical research was carry out based on the International Manufacturing Strategy Survey 2005. Research shows that the manufacturing efficiency, manufacturing input and manufacturing service are affected by the two key factors jointly.
Finite Element Analysis of some Radial Tire
Authors: Zhang Jian , Wang Guo Lin , Fu Nai Ji , Wang Kui
Published: March 2012

Based on some radial tire, Yeoh mechanism model and rebar model are used to simulate rubber and cord. Finite element analysis was used to simulate assembly, shrink, inflated pressure and vertical load case, the process of tire-ground under static contact was analyzed. The computing results were compared with experiments. Mises stress, shearing strain and strain energy potential are used to estimate the critical regions of the tire.
Navigable Flow Condition Numerical Simulation for Approach Channel of Tiangongtang Junction
Authors: Wen Cen , Ran Guo Jin
Published: March 2012

The 2D steady flow mathematical model simulate the navigable flow condition for entrance and connection reach in the upstream and downstream approach channels of Tiangongtang junction corresponding to different quantity of flow, and discuss the flow condition for navigation at entrance area of approach channels. It obtains the flow velocity and flow regime by calculation, and put forward some measures for improving navigation flow conditions.
Grey Correlation Analysis of the Impact of Rate on Urban Transport Structure
Authors: Sun Xiu Qiao
Published: March 2012

Taking the evaluation of the impact of access rates on urban transport structure as the study object, the impact of access rates on various modes of transportation was analyzed using the gray correlation which was a new evaluation method. The feasibility of adopting the traffic congestion pricing policy and the change of transport structure in Nanhai district of Foshan city were analyzed as a real case study. The results indicate that the implement of congestion pricing in Nanhai District of Foshan City, had little effect on the amount of car travel, but the improvement of the city's traffic structure is not obvious. Finally, some valuable suggestions on the optimization of traffic structure of Nanhai District of Foshan City were proposed.
Ecological Design for Indoor Interior Surface of Residential Building
Authors: Wang Bing , Liu Xiao
Published: March 2012

“housing” is the fundamental need for life, and more than 2/3 of the human life is spent in house or other relevant living space. The life that we spent in the house derives various human affections. House, as a solid expression for the unit of families, carries people’s common and realistic demands for comfort and ecological living environment. Being the theme part of the interior design, the inner surface decoration is also the major place for connecting the other facilities. The inner surface design may have more possibilities to bring the ecology ideas to interior design, fulfill the intension and hasten the interior design to a higher wave, and surely it would accelerate the conservation of constructions from source consuming to recycling.
The Investigation of Performance of Gas-Spray Water Quenching
Authors: Tian Chong , Shao Bao Dong , Wang Li Feng , Cheng He Ming
Published: March 2012

In order to study the performance of gas-spray water quenching, the gas-spray water quenching test to 9SiCr alloy steel was conducted. After quenching , the hardness and metallographic structures were investigated. The results show that the hardness of the specimen was greatly improved, and the inner hardness was a little higher than the outer. Besides, the uniform martensite was obtained after quenching.
Study on Demand Bill of Electric Vehicle in China′s Carbon Emission Reduction Environment
Authors: Wang Yu Ning , Tang Bing Qing , Zhang Hai Bo , Fu Xiang
Published: March 2012

A new research method that can estimate the demand of EV in China on the basis of vehicular emission inventory and carbon reduction restriction is put forward. By using MOBILE model and software, China vehicular emissions inventory is created. Then, the demand bill of EV is worked out, and replacement scale and proportion of EV are calculated too. In the conclusion part, quantitative data is given, offering theoretical support for the governments’ strategic policy-making in developing EV.
The Study on EDA Tools for Antenna Design
Authors: Zhou Guo Juan
Published: March 2012

In this paper we have discussed the antinomies that can be identified in the development process of EDA tools for electromagnetic modeling. Namely the dichotomies between the usage of specialized modeling techniques and the need of synthetic methods, between the development of sophisticated methods and its integration in industrial frameworks, between the implementation of closed environment and the User request of an open simulation framework have been analyzed.
The Construction of Warning Model for Technology Patent on Environmental Engineering
Authors: Wang Su
Published: March 2012

To construct warning model for technology patent can effectively get rid of the R&D trap, transaction trap as well as piracy trap. The warning model for technology patent on environmental engineering includes information collection, information regulation, information analysis, warning analysis, countermeasures provision and crisis management. According to the shift of warning evaluation index, it can raise the alarm at different degrees, and help to standardize, scientific and standardize the environmental engineering, so as to guarantee the profit of investment on environmental protection in China.
Synthetic Evaluation of Warfare Capability of Submarine Launched Torpedoes Based on Projection Pursuit Model
Authors: Zhang Ling , Wang Pu Kai , Dong Yu Cai , Lin Min , Yi Liang Hai , Fan Ge Hua
Published: March 2012

Projection Pursuit method invert a number of evaluating indicator into a one-dimensional projection values by the best projection direction, to avoid anthropogenic interference with the expert scoring factors. Application of projection pursuit method for three models of the submarine launched torpedoes capability to conduct a comprehensive evaluation, the best projection direction of the evaluation indicator is got, and a synthetic comprehensive evaluation order of the models is obtained. These supply scientific budget for the operational use , improvements and development of torpedoes.
Design of Software Platform for Online BCI System
Authors: Sun Ai Qin , Fan Bing Hui , Jia Chao Chuan
Published: March 2012

In the paper a software platform is developed for online BCI system based on motor imagery. The programming for multiple monitors is applied to display the notice information of performing imaginary movement. The hybrid programming of using Matlab engine under VC++ is implemented to make full use of the function of signal processing and pattern recognition of Matlab. Both offline EEG acquisition and analysis and online test can be realized with the software platform. And it has high universality and friendly interface.
The Discharge Characteristic Analysis and the Simulation of Axial Piston Pumps
Authors: Wei Xiu Ye , Lu Zi Rong , Wang Hai Yan , Si Lu Rong
Published: March 2012

This paper analyses the influence of geometric parameter on the flow pulsation, calculates its flow pulsation coefficient theoretically,then takes account of the influence of leakage rate on flow pulsation of the plunger pumps, and simulates 5-ram pump to nine-ram pump with its actual parameters to calculate its instantaneous delivery and autual flow pulsation coefficient . The conclusion can be drawn that its actual flow pulse coefficient considering leakage flow is obviously larger than theoretical instantaneous delivery, so we should minimize the leakage.
Effect of Rare Earths Addition on Mechanical Properties and Wetting Behavior of Sn-2.5Ag-0.7Cu Lead-Free Solder
Authors: Yang Jie , Shu Ping Sheng , Feng Xiao Le , Hao Xiu Yun , Wang Yu Peng
Published: March 2012

In the present study, the Effect of rare earths on mechanical properties and wetting behavior of Sn-2.5Ag-0.7Cu solder were investigated. Results indicate that the addition of trace rare earths can improve the properties of Sn-Ag-Cu lead-free solder. The elongation and tensile strength and wetting force of solder can reach the optimal values when rare addition is 0.1wt.%. But excessive rare earths can lead to performance decline. The properties change of the Sn-2.5Ag-0.7Cu solder are attributed to the change of the microstructure caused by trace rare earths additions.