bluuebunny/crossref_metadata_2025 huggingface dataset:
Contrast Source Inversion Algorithm Applied in 3-D Microwave Imaging
Authors: Xie Yu Xin , Wang Xue Jing , Miao Jing Hong , Guo Cui Juan , Li Jiang Xiong , Xia Jing
Published: February 2012

This paper describes an nonlinear three-dimensional (3D) inversion algorithm for reconstructing a homogeneous dielectric target in an anechoic chamber in a controlled environment. The applied algorithm is a nonlinear iterative algorithms—two domain integral equation based method, namely the contrast source inversion (CSI) algorithm. The inversion results, which are presented and compared for the co-polorized data using the multi-frequency multi-bistatic measurements, verify the capability, the accuracy of the CSI algorithm for 3-D microwave imaging.
An Anti-Swing and Positioning Controller for Overhead Cranes Based on Multi-Sliding Mode Method
Authors: Xu Wei Min , Liu Bo , Chu Jian Xin , Zhou Xian Wen
Published: February 2012

Overhead cranes are essentially a kind of complex underactuated nonlinear mechanical systems, and it is a challenge to design an anti-swing controller for overhead cranes, hence, many people design controllers of overhead cranes ignoring the changing of the rope length and other parameters. In this study, we propose a multi-sliding mode controller to solve the problem of anti-swing and positioning controller for an overhead crane with rope length variations. This controller can provide a simultaneous trolley-position regulation, sway suppression, and load hoisting control. Also, this paper adopts a new method to decrease the chattering of the control input. Stability analysis of the proposed controller is given in the paper. The proposed controller does not rely on the accurate knowledge of overhead crane system model, and it is simple and easy to apply, and robust to disturbances. The simulation results show the good performance of the proposed controller.
Decision Analysis in Sustainable Product Development
Authors: Chen Gang , Zhang Hong Chao , Chu Chang Yong
Published: February 2012

As one of the main contributors to global environmental degradation, mechatronic industry must take the responsibility of improving the environmental performance of its products. Compared with further development of green technology, setting environmental protection willingly and seriously as one of the engineering optimization objectives are also important. This paper analyzes the decision making processes from the viewpoint of product life cycle and serves the purpose of reaching a balance between economic profit and environmental performance for each life cycle participator.
Applications of Interaction Design on the Website Interface Design
Authors: Hu Bei
Published: February 2012

The text explains why the process of website interface design wants to involve the interaction design through the own perspective. It also explains what interaction design exactly is on the easily understand way. It mainly demonstrates the design principles of interface, and how to use them correctly in the process of designing. And mentions lots of problems may happen to the process. Its purpose is clear that according to the design principles of interface element in the website interface design process, standing in a higher level to review the interface design to work for the success of website interface design.
Biomechanics Simulation of Volleyball Player in Jumping Spike
Authors: Liu Bin
Published: February 2012

Sports biomechanics is able to identify the variables that aim to define some or all aspects of a performance and then provide useful information for teachers or coaches to improve players' performance. The purpose of the study was to identify the crucial variables that contribute to a successful volleyball spike jump performance by using biomechanical analysis, in order to help teachers improve the jump performance of their students, these investigations allow teachers to observe student performance more systematically and also help them provide the right information at the right time and in an easily understood format.
A New Dynamic Measurement for the Initial Prestress of Membrane Structure
Authors: Zhou Wei Jian , Sun Wen Bo
Published: February 2012

There is an absent of an effective way to measure the prestress of the structural membranes during the construction stage and under normal conditions. A new approach based on vibration method is proposed in this paper. This article analyzes the vibration characteristic of the typical membrane structures (Saddle Shape and High Point Shape) and provides the theoretical basis for a new approach which is convenient for operation and reliable for engineering application.
A Modified Finite Element Model for Electromagnetic Tube Compression Process
Authors: Sedighi M. , Khandaei M. , Liaghat M.A>
Published: February 2012

This paper presents an approach for modification a FEM simulation of electromagnetic tube compression process which has been presented by Mamalis. Electromagnetic free compression of a tube inside a coil has been simulated by using elements with coupled DOFs of electrical and magnetic potentials and displacement components. Mamalis's simulation results show a degree of disagreement with experimental results. In the present work, the coil has been modeled as separate parallel rings and a new correction factor has been determined for the current load applied on the coil. Comparison between simulation and experimental results shows a good agreement at the middle of workpiece with a reasonable error at workpiece ends.
Bio-Polishing of Cotton Fabric with Cellulase
Authors: Bai Gang , Fu Kang Li , Jin Ning Ya , Zhu Li Li , Chai Hong Mei , Lu Da Nian
Published: February 2012

Cotton fabric was polished with cellulase in this paper. The effect of enzyme dosage, pH processing temperature and time on reducing sugar and weight loss were investigated. Enzymatic treatment was found to increase surface smoothness of cotton fabric because most surface fuzzes were removed. The optimum condition of bio-polishing process was as follows: enzyme dosage 3% owf, pH 4.5, processing temperature 50°C, time 60 minutes, liquor ratio 1:20.
AL7N01 Butt Joint Welding Residual Stress Measurement by Ultrasonic Method
Authors: Ma Zi Qi , Liu Xue Song , Cheng Yi , Zhang Liang , Shi Jian Gang , Fang Hong Yuan , Wang Shi Long
Published: February 2012

Analysis the shortage of ultrasonic stress measurement based on Lcr wave in low spatial resolution. Point out it is inapplicable in measuring gradient stress field like welding residual stress field. In this paper, propagation differential method is proposed to solve the low spatial resolution problem on Lcr wave stress measurement, and its theory is introduced. This method can raise the spatial resolution from tens of millimeter to a several millimeter level with out decline the stress resolution. A welding residual stress field of 7N01 aluminum alloy butted joint plate is measured by this method, and its result is compared with hole drilling method. Source of errors is discussed. It is seen that propagation differential method is applicable in welding residual stress measurement.
Case Study of Entrepreneurship and Family Business Succession on the View of Life Cycles
Authors: Zhu Jian An
Published: February 2012

In the most common cases, the first generation creates his business, accumulates wealth and waits for the right chance to hand them over to the second generation. The case study on Fotile Co. provides a perspective of both entrepreneurship and succession of family business. In 1996, Mao Li Xiang and his son, Mao Zhong Qun, started together a business on kitchen products. On the view of product life cycle, Mr. Mao Senior produced the clip reeds subcontracting for the state-owned TV set company and electric gas-lighting for international trade which were manufactured with imitation and at last waned after several years, until in 1996 he devoted himself to the third products, Chinese kitchenware, and beat Western technology with domestic technology and design in meeting the needs in Chinese kitchens. On the view of his individual life cycle, Mr. Mao Senior began with the accountant and salesman in commune and brigade enterprise in the 1970’s, manager of in the township and village enterprises in the 1980’s and the owner of family business in 1990’s when he handed over the right of control and finished the professionalization of management, the upgrading of enterprises as well.
Based on Specific CNC Realize Automatic Integrated Controlling on All-Purpose Induction Quenching Equipment
Authors: Zhuang Shu Jun , Ge Yun Wang
Published: February 2012

In the design of the automatic Integrated control system on the all-purpose induction quenching equipment, In order to applicable for automation controlling in the flexible production line, the economied numerical control system for the core integration control was employed, and integrated control unit was obtained including the induction quenching installment, the induction heating power source, the energy monitoring control, the quenchant and the softened cycle water cooling system.
Based on the Network Connection LAN Trojan Detection System Design and Implementation
Authors: Yang Heng Fen , Wang Xiao Jun , Shu Ping Ping , Zhao Ga , Yang Jun
Published: February 2012

In view of present LAN network security situation, analyzed the main methods to prevent Trojan and defects, we propose a network connection by monitoring and testing features found Trojan approach, and programming Web-based Trojan detection system connected to the LAN. System uses a modular design approach, the entire system is divided into Packet capture, Packet analysis, and Display, three modules can be run independently. Practice shows that this system is stable, fast, accurate analysis, and the use of high commercial value.
A Self-Repairing Control for the Uncertain System of a Helicopter Using Adaptive Sliding Mode Technology
Authors: Chen Fu Yang , Luan Wen Li , Hou Rui
Published: February 2012

In this paper, an adaptive control scheme is proposed for the uncertain flight control system of the helicopter with fault in vertical flight. The controller is designed using sliding mode theory and adaptive technology. In the controller, the nonlinear function is brought in, which can enlarge the small errors, and saturate the large errors. And it can make sure the good transient performances and stability of the helicopter flight control system. Finally, the simulation results of the nonlinear helicopter flight system illustrate the effectiveness and feasibility of the proposed scheme in the paper.
An Efficient Method of Assembly Path Planning in Virtual Manufacturing System
Authors: Gao Qing Feng , Shang Li Long , Zhang Li Xuan
Published: February 2012

With the development of information technology, such as CAD, CAPP and CAM, assembly process, which accounts for large amount of time and cost of manufacturing, to be included in virtual manufacturing system is urgently required. According to the principle that the sequence and path in assembly and disassembly process are reversible, the assembly path can be obtained on the basis of assembly constraints analysis and information model building through optimized and reversed. The method of assembly path planning presented in this paper can effectively reduce computational complexity and improve planning efficiency, whose correctness and efficiency is proven by an application example.
A Reusable Device Driver Framework for the Sensor Nodes in Internet of Things
Authors: Wu Xiao Fan , Bu Jia Jun , Chen Chun
Published: February 2012

Due to the rapid development of Internet of Things (IoT), kinds of sensor nodes have been introduced to the different applications. Because of the variety of MCUs, sensors and radio modules, it’s challenging to reuse the device drivers between different sensor node platforms. To address this issue, a reusable device driver framework is proposed in this paper. Comparing with existed work, our framework is flexible, efficient, and easy to learn. The flexibility is achieved by layered encapsulation, which decouples the device driver with the sensor node operating system kernel. Our framework gives the reusability at the source code level, so it’s efficient. At the end, our framework is implemented in C programming language, which is the most common tool adopted by embedded system developing. This framework has applied to SenSpire OS, a micro-kernel real-time operating system for IoT sensor nodes.
Acceleration Compensating Fuzzy Control in Magnetic Suspension System
Authors: Liu He Xiang , Yu Hai Tao , Hu Min Qiang , Huang Lei , Yu Li
Published: February 2012

In this paper, an acceleration compensating control approach is used for dealing with the non-linear dynamics of a multiple degrees of freedom electromagnetic suspension system. This method not only has simple configuration and is implement easily, but also improves the performance of the dynamic stability and the anti-jamming capability. Simulations on the magnetic suspension demonstrated the efficiency of proposed method.
Analysis of the Full Flow Field of Torque Converter
Authors: Lei Yu Long , Wang Chang , Liu Zheng Jie , Li Xing Zhong
Published: February 2012

Establish the full three-dimensional flow model of the torque converter, proper mesh the model, select the appropriate boundary conditions, and use the sliding mesh method to deal with the interactions of the impeller, turbine, and reactor in different rotation speeds. Analysis the flow rate, pressure, and the loss of full flow field passage of the torque converter, elaborate the formation mechanism of the flow field, agreement with the experimental date compare to the calculated data, more accurate than the traditional single passage model compare to the full passage model, provide the direction of design optimization of the torque converter.
An Improved Immune Algorithm for Solving TSP Problem
Authors: Xue Hong Quan , Wei Sheng Min , Yang Lin
Published: February 2012

Immune algorithm is a set of computational systems inspired by the defense process of the biological immune system, and is widespread used in the combinatorial optimization problems. This paper describes an improved immune algorithm to solve the combinatorial optimization problems. The TSP problem is a typical application of the combinatorial optimization problems. The improved immune algorithm which based on the quantum principles is proposed for finding the optimal solutions to solve the TSP problem. In process of solving TSP problem, the quantum concept is used in initializing a population of quantum bit chromosomes. In the antibody’s updating, the general quantum rotation gate strategy and the dynamic adjusting angle mechanism are applied to accelerate convergence.According to the analysis of the experiment, the algorithm is not only feasible but also effective to solve TSP problem. It effectively relieves some disadvantages of the quantum and immune optimization.
Asymptotic Behavior of Solutions of Neutral Difference Equations Dealing with Mechanical Vibration Problems
Authors: Liu Yu Gao
Published: February 2012

Asymptotic behavior is studied for solutions of neutral difference equations dealing with mechanical vibration problems and other related topics, and some theorems have been obtained.
Design and Application of Programmable Transient Pulse Generator
Authors: Zhao Da Hai , Hu Yong Hong , Liu Xu Dong , Wu Peng
Published: February 2012

A programmable transient pulse generator is designed. In this paper, hardware and software design principles was described, a programmable transient pulse generator based on single-chip which is used for stepper motor controller as a specific application instance is also given. Experimental tests show that the design circuit is simple, the pulse width and the cycle can be set according user needs, and this generator also can be used in multifunctional monitoring and control system.
Crack Damage Identification of Reinforced Concrete Simply Supported Beam Based on BP Neural Network
Authors: Yang Xiao Ming , Li Fu
Published: February 2012

Considering the good forecasting capability of BP neural network, a new crack damage identification method for reinforced concrete simply supported beam is proposed in this paper. After simulating the crack damage of a reinforced concrete simply supported beam, the natural frequency of the beam is chosen as the input parameters of the BP neural network. The data before and after damage of the simply supported beam are put into the trained neural network to judge the structural damage. The results demonstrate that the approach has a better application prospects in structural damage identification.
Braking Cause Railway Passenger Cars Wheel Tread Scratches Reasons and Prevent
Authors: Tu Jia
Published: February 2012

Wheel tread scratches on the vehicle itself and the harm of the line is more and more big, the threat of on the traffic safety are getting more and more serious. The train is due to the brake wheel tread is an important cause of bruises, staff operation methods and braking equipment work braking good or not will affect the wheel tread scratches. By improving the working staff of braking operation to brake technology and strict inspection, repair, eliminate brake failure, and prevent and reduce wheel tread scratches, ensure the safety of passenger.
Adsorption Characters of 17α-Ethynyestradiol by Activated Carbon
Authors: Yang Hui Yong , Li Qing Song
Published: February 2012

This paper studied the activated charcoal absorption EE2 characters by static absorption method. The result showed that EE2 can be removed effectively by activated carbon adsorption. Langmuir isothermal equation can describe the adsorption EE2 characters of activated charcoal well. The relativity adsorption coefficient reached marked or extremely marked level; compared with adsorption performances of different kinds of activated carbon coefficient, the adsorption capacity of PAC3# was the largest to EE2, The adsorption rate of PAC7# was the fastest, but the adsorption capacity of PAC7# was the smaller.
Design of Multi-Axis Motion Controlled System Based on SERCOS Bus
Authors: Chen Liang Ji , Zhang Xiao , Li Hui Ying
Published: February 2012

SERCOS is an international standard for communication in the digital servo system and electrical drives. It has been increasingly used in industrial automation equipment. This paper introduces the working principle and property of the SERCOS interface, and the SERCOS bus technology is used in the multi-axis motion control system. The PC coordinately control the slave computer through SERCOS bus. At the same time, PC will receive the feedback information of motion parameters timely, which can enhance the flexibility of the control system. SERCOS realizes the multi-axis motion based on the TwinCAT software platform, which has verified the rationality and feasibility of the control structure.
Design and Simulation of Bi-Directional Hydraulic Lock Used in Hydraulic System for Controllable Pitch Propeller
Authors: Huang Shuai , Li Jing , Zhang Jin Feng , Chen Yun , Yin Yao Bao
Published: February 2012

This paper designs a bi-directional hydraulic lock used in a large flow hydraulic system for controllable pitch propeller. The lock is used to resist the hydraulic cylinder shifting when the pitch reaches the presetting situation. The structure parameters of the lock are obtained by static design, and the dynamic performance of it is analyzed by modeling and simulation with the system on rated load. The dynamic simulating discovers the faults of the lock designing by static calculating and the results provide sufficient supports for its parameters optimization.
Design of a Kind of Novel Limited-Angle Brushless Torque Motor
Authors: Fan Zhan Ting , Liu Wei Guo , He An Chao
Published: February 2012

A kind of 5Nm prototype LABLTM (Limited-Angle Brushless Torque Motor) is presented and designed. The basic structure of the motor is deliberated. The method of calculating the electromagnetic torque is provided. The Magnet software is used to optimize some important parameters of the motor. The prototype is fabricated. The test results of the prototype indicate that the LABLTM, with high torque and high reliability, does meet the requirements of direct drive actuator of precision welding equipment. It has a promising future in automatic control, electrical drive, etc.
Design of Auto-Detection Instrument for Airborne Thermometer System
Authors: Zhang Xiao Yu , Fan Jun Feng
Published: February 2012

To improve the test precision of detection device for some airborne thermometer system, the hardware structure and software design of auto-detection instrument for airborne temperature indicator are introduced. The 89C52 single-chip computer is used in the detection instrument. The CPU、A/D、 D/A and I/O boards are assembled as a cascade structure. By using the technology of the advanced chip and Lab Windows / CVI 5.0, the instrument’s precision and flexibility is greatly enhanced. The testing results illustrate the testing resolution is 23Bit, the output electric current is 10mA, the precision is ±0.01mV.
Design of Digital Controlled Signal Generator Based on DDS and MCU
Authors: Chen Yin Jun , Yuan Ze Huai
Published: February 2012

Its advantage to use DDS chip is output signal frequency bigger, and precision higher, But users can't change the output signal waveforms. The MCU can produce the required arbitrary waveforms, but its program execution of the order limit the speed.So we use their Synergy to design the digital controlled signal generator. The System has the advantage of output good quality waveform, frequency of precision and stability ,and high frequency, empty, amplitude and phase is to step into the need.
On Integral Control Laws Improvement for Lengthways Pitch Angle Displacement System
Authors: Cao Dong , Qu Dong Cai , Dai Shao Wu , Yu Jin Yong
Published: February 2012

In order to improve the control capabilities of aero lengthways angle displacement system, the system’s integral control laws improvement design were done by the zeroes and poles collocation method. Based on the matlab simulation platform, a kind of improved controller was designed, and enhanced the control system’s stability precision. Simulation results show that improved control system and it’s integral control laws had gotten the more satisfying control capabilities.
Research on Pressure Feature of Airflow in Fuze Inlet Tube
Authors: Yue Ming Kai , Su Xiang Dong
Published: February 2012

The research on the pressure and velocity characteristics of the fuze inlet airflow as a second environmental force was done. The pressure difference under different airflow velocity between two pressure openings set up at fuze inlet tube throat and expansion section was obtained by CFD simulation. Through the simulation and analysis on ballistic characteristics and fluid pressure characteristics , the time characteristics of pressure difference of the pressure openings were summarized. Furthermore,the quantitative analysis result of the output signal and the feasibility of the pressure difference as an information source for fuse arming are put forward.
Visual Navigation of Four-Wheel Car Based on the Marking Line
Authors: Liu Ming Qin , Zhang Xiao Guang
Published: February 2012

It realized the visual navigation based on the marking line by putting forward marking identification algorithm with the combination of edge detection and environmental knowledge according to the characteristics of mathematical model and the navigation of marking line, and proposed path planning and driving control method by combining with the mathematical model of trolley to realize the visual navigation of four-wheel car based on the marking line. Taking the square mark trail as object to make experiment, the result shows that, the visual navigation system can track marking line in real-timely and control the robot driving along the path of marking line.
Sensitivity Analysis of Material Parameters on Spring-Back of NC Bending of High-Strength TA18 Tube
Authors: Zhang Pei Pei , Zhan Mei , Huang Tao , Yang He
Published: February 2012

Spring-back is one of the key factors affecting the forming quality of the NC bending of high-strength TA18 tubes (TA18-HS tubes). Since material parameters have a direct influence on stress and strain fields during the bending and after unloading, the springback of TA18-HS tubes after NC bending depends on material properties to a great degree. In order to study the effect of material parameters, the sensitivity of material parameters on spring-back of TA18-HS tubes is analyzed in this study, using the numerical simulation and the multi-parameters sensitivity analysis method. The results show the following: (1) The springback angle has a positive correlation with the strength coefficient and initial yield stress, and has a negative correlation with the elastic modulus and strain hardening exponent. Besides, with the increase of elastic modulus, the fluctuation of springback goes gently; with the increase of the strength coefficient and initial yield stress, the fluctuation of springback goes abruptly; but with the variation of the strain hardening exponent, the springback fluctuates slightly; (2) The elastic modulus is the most sensitive material parameter on spring-back, the strength coefficient and initial yield stress rank the second and third, respectively, and the strain hardening exponent is the last. The achievement of the study is valuable to eliminate the non-sensitivity parameters, simplify the optimization project, and improve the spring-back prediction capability.
Adaptive Repetitive Control of Nonlinearly Parameterized Systems Based on Fuzzy Basis Function Networks
Authors: Sun Wen Li , Cai Hong , Zhao Fu
Published: February 2012

In this note, an adaptive repetitive control scheme is presented for a class of nonlinearly parameterized systems based on fuzzy basis function networks (FBFNs). The parameters of the fuzzy rules are tuned with adaptive schemes. The adaptive repetitive control law is derived by using Lyapunov synthesis method to guarantee the closed-loop stability and the tracking performance. By means of FBFNs, the controller singularity problem is solved as it avoids the nonlinear parameterization from entering into the adaptive control and repetitive control. The proposed approach has the added advantage that it does not require an exact structure of the system dynamics. The proposed controller is applied to control a model of permanent-magnet linear synchronous motor (PMLSM) subject to significant disturbances and parameter uncertainties. The simulation results demonstrate the effectiveness of the proposed method in terms of significant reduction in chattering while maintaining asymptotic convergence.
Microstructure Effect of Injection Molded Nanoparticle/Polymer Composites on their Resistivity
Authors: Zhang Bao Feng , Jiang Ai Yun , Liu De Bo , Wu Hai Hong , Zou Jing Chao
Published: February 2012

Although the progress has been achieved in conductive Nanoparticle/Polymer Composites(NPC), but there are many problems to be solved before their commercial application in a large scale, especially on their processing technology. The barriers include the dispersion of nanoparticle, the effect of nanoparticle concentration and interface on the overall properties of materials. In order to improve the application of NPC, the microstructural effect of injection molded NPC on its resistivity was investigated to build the relationship between the processing conditions and the properties in this paper. Composites used in the experiment were carbon black(CB)/polypropylene(PP). The microstructures of the injection molded parts at different positions were investigated with Scanning Electrical Microscope, and corresponsive properties were tested. The results showed that the distribution of CB nanoparticles changed with the injection pressure and had significant effect on the conductivity of the part. With the increase of injection pressure CB particles strongly oriented towards the flow direction of the polymer and thickness of oriented layer increased, which improve conductivity of the composites. The results also showed that crystallization was enhanced because of existence of nanoparticles, which should have increased the mechanical properties of the composite and decreased its resistivity because of the interfacial action between CB particles and polymer matrix.
Study on Catalysis Mechanism of Electrochemical-Particles Jet Compound Machining
Authors: Zhang Cheng Guang , Zhang Fei Hu , Zhang Yong
Published: February 2012

The paper studied that the catalysis mechanism of electrochemical-particles jet compound machining(ECPJM) based on particles impact. The theory was analysed and experiment was carried. The results show that particles impact promoted electrochemical-particles jet compound machining. So the particles impact had the catalysis of the anodic dissolution in the electrochemical-particles jet compound machining. The results also indicate that the processing velocity can be improved under the particles impact, obtaining the surface quality in the electrochemical-particles jet compound machining.
A Research of a Remote Control System Based on Timed Petri Net for PDA
Authors: Chen Wen Chin , Tai Yi Chia , Liu Kai Ping
Published: February 2012

In the distributed control system, it is not easy to communicate between different operating systems due to the different control platforms. Therefore, the control system is difficult to repair and upgrade. In this study, we employ Timed Petri Net to build up architecture of the real-time control system. The client not only can monitor the current status of production line via the World Wide Web in the OEM plant but also can allow equipment supplier to perform supervision, analysis, and repair in the real-time state. The operation of the hardware platform that is no longer limited to the personal computer (PC) can also support the use of PDA(Personal Digital Assistant) , and internet browsing hardware, and web site monitoring system connected through the web page to monitor the purpose of monitoring equipment machine.
The Audio Signal De-Noising Based on the ARIMA Model and Kalman Filter
Authors: He Peng Ju , Qin Li Li , Zhang Liang Liang , Wu Qiong
Published: February 2012

Aiming at the problem of non-stationary noise is difficult to eliminate, the audio signal is analyzed by the means of time series analysis. The auto regressive Integrated Moving Average (ARIMA ) model is established. The recursive extended least squares (RELS ) algorithm is adopted to realize the real-time estimation of parameter. The kalman filter is used for compensating the model error of the audio test system. It is concluded from the simulated results that the proposed methods achieve better smoothing effects and more effective inhibitions of the audio signal random noise, and improve the signal-to-noise ratio of the audio signal.
Investigation to Self-Piercing Riveting of Wrought Magnesium AZ31 Sheets
Authors: Liu Zhong Xia , Wang Pei Chung , Wang Jun Wei
Published: February 2012

In this study, the fabrication of the desired SPR joints was investigated as a function of the preheat temperature and strain rate. To determine the optimum preheat temperature, Gleeble thermal analogue testing of 2mm thick magnesium AZ31 was used to assess the combined influence of preheat temperature and strain rate on the strength and total elongation of magnesium AZ31. Magnesium alloy AZ31 with a thickness of 2mm was preheated with various temperatures prior to self-piercing riveting. The appearances, cross-sections and mechanical tests of the SPR magnesium AZ31 joints were investigated. It was found that a preheat temperature of 180 to 200oC largely eliminated the cracking in magnesium AZ31 joints. The joint strength increases with increasing preheat temperature from ambient to 200oC. The strength increase is attributed to the reduction in joint cracking and an increase in mechanical interlock between the rivet and work pieces.
Electroless Sn Deposition on Magnesium Alloy and Wastewater Treatment
Authors: Niu Li Yuan , Su Yi Chang , Sun Da Ren , Li Guang Yu
Published: February 2012

The new process electroless Sn deposition on cast AZ61 was revealed, which employed to AZ61 magnesium alloy automobile parts and could provide high wear-resistant and high hardness. The pretreatment processes before electroless Sn deposition could ensure better adhesion between Sn coating and magnesium alloy. The speed of the Sn deposition increases quickly with increasing the content of composite catalysts in the plating bath. The technology is environment friendly and cannot cause hazard to environment because of absence of nickel and chromate in the whole process. Wastewater treatment technology of electroless Sn bath was investigated as well.
Numerical Analysis for the Characteristics of Stress Distribution on Lap Laser Welding Joint of Stainless Sheet Steel
Authors: Shi Chun Yuan , Li Lei , Wang Hong Xiao , Yao Yu Xin
Published: February 2012

It gave a better strength that taking lap laser welding (llw) instead of resistant spot welding (rsw) to assemble the framework and the flankwall of stainless steel car body structure, and the fracture situations of fatigue test were different in the two welding methods. That was chiefly connected to the stress distribution and concentration of welding joint. The analyses on stress distributions and concentration factors of the two joints in different external loadings were made in this paper. The results indicate that the stress concentration factor of llw joint on the flankwall is 73.4% lower than that of rsw and the value on the framework is 81.6%. The crack initiation site of fatigue test appears at the place with the highest stress concentration, which is agreed well with the theoretical analysis.
Dynamic Analysis of Human Ear during Sound Transmission
Authors: Ghafari Ali Selk , Zahiri Saied
Published: February 2012

The aim of the present research is to simulate dynamic behavior of the human auditoria peripherals during sound transmission using the equivalent six-degrees-of-freedom lumped parameter mathematical model. Transmissibility analysis was employed to get a better insight into the sound transmission from tympanic membrane to malleus, incus, stapes, and cochlea. Furthermore, transmissibility from each member to corresponding adjacent member was carried out to functional analysis of the human ear. Simulation study illustrated that the results are in agreement with the experimental results published in the literature, and the proposed model provides more information in the dynamic analysis of middle ear biomechanics.
Optimization of Process Parameters using DOE, RSM, and GA in Plastic Injection Molding
Authors: Chen Wen Chin , Kurniawan Denni , Fu Gong Loung
Published: February 2012

In the past, plastic injection molding (PIM) product quality was usually measured by one single quality characteristic or by multiple quality characteristic with independent parameters one another. In this study, optimization of process parameters using design of experiment (DOE), response surface methodology (RSM), and genetic algorithm (GA) were proposed to generate the optimal process parameters settings of multiple-quality characteristics. In the first stage, significant PIM process parameters can be determined by DOE screening experiments. Then the optimal process parameter settings are obtained via computer aided engineering (CAE) simulation integrated with RSM and GA, which are taken as practically initial settings of process-related parameters. The experimental results show that the propose optimization model is very successful and can be used in industrial applications.
Conformal Geometry Solitons
Authors: Cao Rong Rong , Gao Xiang
Published: February 2012

In this paper, we deal with a generalization of the Yamabe flow named conformal geometry flow. Firstly we derive a monotone formula of the Einstein-Hilbert functional under the conformal geometry flow. Then we prove the properties that the conformal geometry solitons and conformal geometry breather both have constant scalar curvature at each time by using the modified Einstein-Hilbert function. Finally we present some properties of Yamabe solitons in compact manifold and noncompact manifolds through the equation of Yamabe soliton.
The Stability and Management of “Sandwich” Type Slopes in Extrusive Rock Area
Authors: Wei Hong , Wang Hong
Published: February 2012

Northern area of Hainan Island is located in the south of Leiqiong faulted zone; new tectonic movement and volcanic activity have intense since late tertiary. Cenozoic volcano in the region is developed, various types of extrusive rocks widely distributed which often directly cumulate on the Cenozoic sedimentary soil layers, then covered by more loose soil, form a soft - hard - soft “sandwich” type slope with a poor stability. Based on the study of this slope and simulate its stability, this paper proposed this kind of slope's destruction mechanism as well as the management method
The Study of Stadium Industrial Development Status and Countermeasures of Physical Education Institute
Authors: Feng Jia Fu
Published: February 2012

The paper by means of a large number of literature was consulted, visit the domestic partial Physical Education College stadiums management departments, realizing the current situation of our country Physical Education College stadiums deeply and the current situation and the existing problems, And the feasibility analysis of industrialization development of stadiums. Finally, the paper puts forward stadium industrialization of management mode and its operating system.
Study on Applied Load and Irradiation of Ultraviolet (UV) Aging of Polycarbonate Characteristics: Consequences on Mechanical Properties
Authors: Jung Do Yeon , Abdel Hay Abdallah , Lim Jao Kyoo
Published: February 2012

Abstract. In present study, the effect of irradiation along with applied load and three periods on the ultraviolet (UV) aging of the polycarbonate polymer was investigated by observing the changes in the mechanical properties. Dog bone specimens of polycarbonate were subjected to different test conditions namely in the amount of applied load and the variation in exposure time to the UV lamp. The results showed that, with a constant applied load of 1kN, increase in the exposure time in UV radiation caused the mechanical properties to relatively increase at first and decrease gradually afterwards. However, for constant exposure time, the tensile strength showed much decrease with increase in applied load. For the test conducted at higher applied load of 3kN, the mechanical properties of material relatively improves in a drastic manner for the higher exposure time. It was inferred that the increase in applied load has a crucial role in the UV aging of polycarbonate for the given exposure time. Moreover, the morphology of the fracture area under different test conditions was observed by Scanning Electron Microscope (SEM).
Research on Metallurgical Structure and Hardness of LY12 Aluminum Alloy Weld Zone under TIG and A-TIG
Authors: Wang Yan
Published: February 2012

This paper studied and framed TIG and A-TIG welding procedure of LY12 aluminum alloy and analyzed the metallurgical structure and hardness of weld zone of TIG and A-TIG under different welding current. The result showed the strengthening phase which separated out from the basal body of TIG weld zone was obviously fewer than A-TIG and the strengthening phase of TIG obviously decreased when welding current increased. Compared with TIG weld zone, surface activating flux changed the metallurgical structure of A-TIG weld zone and the strengthening phase of A-TIG weld zone was more than TIG. The strengthening phase of A-TIG weld zone did not obviously decreased when welding current increased that implied the strengthening phase of A-TIG did not obviously dissolve into the basal body as TIG and only coarsened with the increase of welding current. The hardness experiment of weld zone showed that the hardness of A-TIG weld zone was higher than TIG and the hardness of 60%NaF+40%SiO2 activating flux of A-TIG weld zone was higher than 40%NaF+60%SiO2 activating flux.
A Novel Electrodeposited Ni-Cr-Al Nanocomposite with Improved Oxidation Resistance
Authors: Yang Xiu Ying , Peng Xiao , Wang Fu Hui
Published: February 2012

A novel Ni-3Cr-10Al nanocomposite (wt.% ) was fabricated by co-electrodeposition of Ni matrix with Cr and Al nanoparticles. Oxidation in air at 900 oC showed that the Ni-3Cr-10Al nanocomposite compared with the alloy showed good oxidation behavior due to the selective oxidation of Al favored by its unique structure.
The Mechanical Properties Research of Stress Frame Casting under Different Solidification Conditions
Authors: Fan Zhen Zhong , Xiong Yan Cai , Zhou Yong Jiang
Published: February 2012

This paper describes the cast structure study of A357 aluminum alloy stress frame casting under consecutive solidification and simultaneous solidification by test and numerical simulation methods, with the conclusions of tensile tests by using of SEM and EDS analysis, the mechanical properties and fracture morphology were observed both under the cast and T6 heat-treatment state. Intergranular fracture cracks were observed to be the main failure mode in the casting state condition, cracks originated from the tissue defects and continued to proliferate until the tensile specimens were ruptured. Simultaneous solidification can decrease the casting shrinkage and micro-cavity and improve the mechanical properties of the castings. Dimple fracture was the dominated failure mode after T6 heat treatment state, the distribution of some intergranular cracks staggered with dimple fracture can surveyed under the fractography analysis. The superiority of simultaneous solidification was demonstrated by the numerical simulation of China casting CAE.
Comparison of Hot Corrosion Resistance of YSZ and CYSZ Thermal Barrier Coatings in Presence of Sulfate-Vanadate Molten Salts
Authors: Ahmadi Pidani Raheleh , Shoja Razavi Reza , Mozafarinia Reza , Jamali Hossein
Published: February 2012

In this study, NiCoCrAlY bond coat and two types of top coat including yttria stabilized zirconia (YSZ) and ceria and yttria stabilized zirconia (CYSZ) were deposited on IN 738LC by air plasma spraying (APS). Hot corrosion behavior of samples in 1000 °C was study using 55wt.%V2O5-45wt.%Na2SO4 corrosive salt. Characterization and analysis of results was done by employing field emission scanning electron microscope (FESEM) and x-ray diffractometry (XRD). Results ravealed that plasma sprayed CYSZ TBCs exhibited excellent hot corrosion resistance which was superior to that of YSZ TBCs due to strong acidity and high contents of stabilizer.
X-FEM Applied to Three-Dimensional Curvilinear Crack Front
Authors: Wu Liang , Guo Ya Kun , Zhang Li Xing
Published: February 2012

A three-dimensional extended finite element algorithm coupled with the level set method is developed for curvilinear crack front problems. This method does not need to force the discontinuities to be in conformity with the mesh. In order to compute the pointwise stress intensity factors along the curvilinear crack front, an orthogonal curvilinear coordinate system is constructed at the intersection point between the crack front and a surface of the crack front element. As the crack surface is expressed by the level set method, no explicit meshing of the crack geometry emerges on the crack front. This makes the domain integral more difficult. An independent grid of hexahedral cells around the crack front needs to be built as the virtual extension domain for accomplishing the domain integral. To assess the accuracy of the approach, an example with semi-elliptic crack surface is considered. The results show excellent agreement with the results calculated by the standard finite element method and those obtained from the literature.
Study on Construction of Strategic Alliances of Procuring Agricultural Means of Production
Authors: Song Hai Feng , Liu Ying Zong
Published: February 2012

The three styles of procuring agricultural means of production were compared to explain the theoretical basis to build the strategic alliance. And related indicators ,for example purchasing price, quantity and the total profit are compared in different relationship between agricultural means suppliers and farmers by building mathematical model .In the end, it is concluded that if the farmers form horizontal alliances, and then, form strategic alliances with suppliers, the system’s related total profit is the most. Owing to construction of strategic alliances, not only the profits of suppliers can increase, the costs of famers also reduce.
Numerical Simulation of Peak Overpressure and Positive Pressure Time of Explosion Shock Wave in the Air
Authors: Liu Chao , Hu Zhi Jian , Wang Yun Yang , Dai Tao
Published: February 2012

A new rational peak overpressure formula about scale distance has been summarized by comparing differences of domestic and foreign scholars’ empirical formula. AUTODYN has been used to simulate the shock wave in the air by taking different mesh sizes. Comparing the numerical simulation results and empirical formula results, only when the scale distance is too small, two results about peak overpressure have certain deviation. But both results about positive pressure time are similar.
Optimal Design of LQR Controller for Single Inverted Pendulum
Authors: Peng Yong , Liu Zhi Neng
Published: February 2012

Aiming to the multi-variable, non-linear, high-order, close coupled, inverted pendulum system, a mathematical model of the inverted pendulum was established. The LQR controller was put forwards according to this model. In the LQR controller, the selection of the weight matrix Q and R directly impact on structural dynamic response and controlling force. How to determine the optimal Q and R to obtain the global optimal control is still a problem. The matrix Q and R were optimized based on genetic algorithm with different objective functions and the results were verified here. The simulation results show that the optimal preference weighting coefficient were obtained by genetic algorithm and the satisfactory factors can be selected by the designer according to the preference, while the subjectivity and blindness of the conventional method have been overcame.
Effects on Corrosion Resistance of Ce-Sealed Ni-P Coatings with Ni-Low P and Ni-Medium P
Authors: Wang Chun Yu , Li Huan Ran , Zhang Wei , Yu Yang , Wen Guang Wu
Published: February 2012

The post-treatment with Ce-rich sealing of Ni-P coating (Ce-sealed Ni-P coating) was developed on Al surface. Effects of corrosion resistance with different phosphorus contents in the Ni-P coatings were investigated in this paper. The results of the polarization curves show that the Ce-sealed Ni-(10wt.%)P coatings have the higher corrosion potential (Ecorr) and the lower corrosion current (icorr), indicating that this coating iSubscript texts a better corrosion inhibitor than Ni-(3wt.%)P coating. These results demonstrate that the P content plays an obvious role on improving the corrosion resistance of Ni-P coatings. It is results of SEM analysis shows that the Ce-sealed Ni-(3wt.%)P coating has not obvious micro-cracks, the Ce-sealed Ni-(10wt.%)P surface with some micro-cracks are appeared on Ce-rich coating. But this micro-cracks phenomenon of Ce-rich coating can not effect on corrosion resistance. Otherwise, there are no peaks of Ce-riched coatings in both XRD patterns, because too less Ce elements and non-crystal tendency is more serious on these coatings.