bluuebunny/crossref_metadata_2025 huggingface dataset:
The Forming for the Link Wheel Parts Library and the Corresponding Two-Dimentional Engineering Drawings Based on Pro/E
Authors: Wang Yue Ting , Wang Yun Qiang , Sun Bing Xin
Published: February 2012

Introduced a kind of method which can establish machinery parts library based on Pro/E, the practical method is easy to grasp. The process of forming parts library is showed combing with Link Wheel living modeling. At the same time, gave the corresponding two-dimensional projection drawing.
Study of Method on Genetic BP Networks for Vibration Fault Diagnosis of Turbogenerator
Authors: Zhang En Ping , Zhang Hui Fen , Xue Bi Cui
Published: February 2012

Considering the complexity and relevance of fault diagnosis for turbo-generator, the paper makes diagnosis by adopting improved genetic BP network algorithm. In order to solve the problems of slow network learning and tendency of minimum point in BP algorithm, the structure and specific parameter of BP network optimized by genetic algorithm were used in the discussion of a model integrated with adaptive genetic neural algorithm, which was applied in the fault identification of turbo-generator. Experimental data shows that the algorithm is characterized by high convergence rate, effective vibration fault diagnosis for turbo-generator and relative high reliability and practicability.
Research of Design Technology of Reconfigurable Shift Unit Based on Multilevel Interconnection
Authors: Su Yang , Dai Zi Bin , Li Wei
Published: February 2012

Design proposal of reconfigurable shift unit based on multilevel interconnect barrel shifter is presented, which can support 8~32 bit wide and any variable length between 1 bit and 31 bit. Through adding expander circuit, the width of this unit can broaden to 8~128bit. The design has been realized using Altera’s FPGA and synthetized and optimized on Synopsys’s Design Compiler. The result proves that the maximum frequency can achieve 400MHz on 0.13µm CMOS technology.
Study on Effects of Cu Content on Properties of Al-Mg-Si Aluminum Alloy
Authors: Zhang Jian Xin , Shao Shui Jun , Li Liang
Published: February 2012

The effects of Cu element on properties of Al-Mg-Si aluminum alloy was studied, and the mechanism of Cu in influencing the property of the alloy was discussed. The results indicate that Cu element can weaken the conductivity property of alloy material, its thermal conductivity is improved with slow cooling. Cu element is sensitive to corrosive property of the alloy, it can cause corrosion resistance decreasing significantly, quenching heat treatment made corrosive property of the material deteriorative. Proper Cu element is helpful to microstructure refinement and the enhancement of strength, tensile strength of the material is increased 10 percent after solution treatment and ageing strengthening.
Knowledge Based Engineering in Complicated Product Design
Authors: Li Jia , Yang Yun Bing , Wei Fa Yuan
Published: February 2012

Under the tendency of knowledge economy in the world, knowledge research becomes a hot subject. The analysis about the meanings, categories and characteristics of knowledge is presented at first. The concept and key techniques of Knowledge Based Engineering (KBE) are discussed. The differences and relationships among KBE, Expert System (ES) and CAD/CAE/CAPP/CAM (CAX) Systems are analyzed as well. An example on knowledge-based designing of one complicated product is provided. A product knowledge base is established by analyzing the structure and characteristics of product design knowledge. Product knowledge integration and management is fulfilled using Product Data Management (PDM) and dynamic database technique.
Design of Flow Simulation Subsystem of Ground Simulation Test for Aircraft Fuel System
Authors: Yuan Zhao Hui , Cao Nian Xia
Published: February 2012

Flow simulation subsystem of ground simulation test for aircraft fuel system aims to simulate fuel flow of engine. In a certain airplane fuel system, the flow scope is very broad. In order to ensure the control precision in the whole range, the method of subsection control and measuring has been put forward. A control algorithm based on fuzzy adaptive PID with two-degree of freedom has been adopted, since subsection control will bring out the switchover fluctuation phenomenon. The results of simulation show that this algorithm can realize the curve tracking of the wide-range flow and reduce the fluctuation in the flow switchover process. That is to say, this algorithm has a preferable control effect.
Remote Monitoring System for Unattended Electromechanical Equipment Based on Internet
Authors: Wang Gui Ping , Jia Er Dong , Guan Li Min , Bai Yun Ting , Ma Xiao Yan
Published: February 2012

The unattended electromechanical equipments are widely distributed in the harsh environment, which makes it difficult to construct the monitoring system. Therefore, this paper proposes a solution of the remote monitoring system based on Internet, which applies the VLAN (Virtual Local Area Network) technology in constructing the network. The network microprocessor STM32F107 is adopted to design a low-cost remote information terminal. The system software is designed based on B/S (Browser/Server) architecture by ASP (Active Server Page) technology, which implements SCADA (Supervisory Control and Data Acquisition) and pre-warning system for the unattended electromechanical equipments. The application shows that the system is stable, reliable and worth popularizing.
Virtual Prototype Modeling and Dynamical Simulation of Swing Movable Teeth Reducer
Authors: Wang Yan Fang , Liu Lu Ning , Yang Bo
Published: February 2012

Swing movable teeth reducer is a new type of small teeth difference planetary gear reducer, which is used to transmit the rotary motion and power between two shafts with same axis. It is important to carry on the systematic design and performance simulation of the reducer and seek the optimization design of the products by the virtual prototyping. Based on the study of the principles and characteristics of the swing movable teeth transmission, this study established the virtual prototype and achieved the dynamical simulation of the reducer by CAD/CAE software. The rotate speed and force analysis proved the feasibility of the model.
Design and Implementation of a Rocket Launcher with Improved High Speed & Accuracy
Authors: Li De Ying
Published: February 2012

Aiming at high speed and accuracy position control, this paper introduces design of an optimal internal mode control and sliding mode control for rocket launcher servo systems which have large varied moment of inertia, strong impact moment and load moment. Internal mode control designed by LQR theory can satisfy system requirement of the position loop in PMSM system. Sliding mode control can restrain effects that caused by model parameter perturbation and external disturbance and realize high performance position control. Simulation results show that the control method is simple and has better performances compared with PID controller.
Modeling and Simulation of Brushless DC Motor Adaptive Fuzzy PID Control System for Pure Electric Vehicle
Authors: Song Shu , Zhang Ya Jun
Published: February 2012

Pure Electric Vehicles (PEV) is an important research direction to solve the problems of auto environment and energy sources. Research double close-loop control system of PEV driven by Brushless Direct Current Motor (BLDCM) has the practical value. Traditional PID controllers have some advantages of being simple, reliable and effective for linear systems, but not for time-varying systems or highly non-linear systems. In order to improve the performances in both steady state and transient state of control system, an Adaptive Fuzzy PID Controller (AFPIDC) can be employed. The dynamic model of PEV and the mathematic model of BLDCM can be analyzed and established. Simulation model of Speed and Current Double Close-Loop Control System are implemented by Matlab7.0/simulink. The simulation results show that the system has rapid response, without static error and overshoot, good performance and strong robustness, high capacity of resisting disturbance.
Simulation Design of the Control Valve for Air–Powered Engine
Authors: Lian Yong Qing , Tian Bing , Wang Shu Zong
Published: February 2012

To satisfy the demand of inlet pressure for air powered engine, it is necessarily to design control valve. The design idea of control valve was proposed, and the models for simulation design were established. These models are air bottle state model, open area model of control valve, spool dynamic model and shape calculation model of characteristic vent. Based on these models, the joint simulation and the experiment test have been done. The result shows that the designed control valve can provide required inlet pressure for air powered engine and satisfy the work demand well. The result of the experiment verifies the rationality and validity of the simulation design, and the method can be used in the design of the congener valve.
A Rock Cracks Dynamic Recognition Algorithm Based on Fingerprint
Authors: Xiao Ling Ling , Liu Yan Ting
Published: February 2012

Traditional detection technology of rock cracks in mine is asking somebody to go deep into the mine and detect them. This method doesn’t only waste so much labor force, but also lose timeliness. It will bring amount of risk to the workers and the results will contain subjectivity. As complex texture of rock is similar to the fingerprint, we give a rock fracture recognition algorithm based on fingerprint. In this paper, the fingerprint recognition algorithm is introduced into the rock texture recognition, and to be improved by us. We demonstrate the algorithm is feasibility with experiments.
Solvent-Free Aerobic Oxidation of Benzyl Alcohol by Resin Supported Noble Metal Catalysts
Authors: Deng Shao Xin , Wang Hu , Chen Tie Hong
Published: February 2012

Noble metal nanoparticle catalysts supported by resin were prepared by a simple adsorption method. Resin D261 is an organic polymer containing quaternary ammonium group. The specific interaction between quaternary ammonium groups and different kinds of noble metal precursors can be generally applied for the preparation of supported noble metal catalysts. Due to the specific interaction, an easy control of the loading of noble metal can be achieved. Furthermore, without using volatile organic solvents and calcinations in the preparation procedure, the method reported here is environmentally benign and economically feasible. The catalysts were tested in aerobic oxidation of benzyl alcohol to benzaldehyde under solvent- and base-free conditions and exhibited high activity and excellent selectivity.
Experimental Study on Mechanical Properties of Basalt Hybrid Fiber Reinforced Polymer Sheets
Authors: Pan Jian Wu , Yuan Xi Gui
Published: February 2012

A new type of intermingled basalt hybrid fiber reinforced polymer (BHFRP) sheets were weaved with basalt/carbon(B/C) fiber, or basalt/aramid(B/A) fiber. The ultimate tensile strength, elastic modulus and ductility were studied by experiment, and the mixture ratio on the performance was analyzed based on experimental results. The results showed that: compared B/A HFRP to B/C HFRP, B1A1 had better ductility, but low tensile strength; B2C1 had higher tensile strength and better ductility. Finally, scanning electron microscope was using to study the microscopic structure of fracture surface.
Influence of Novel Nucleating Agent on the Mechanical Properties and Crystallinity of Polyoxymethylene
Authors: Jiang Li Zhong , Jiang Feng Dan , Yang Jun Zhong , Li Rui Kang , Hu Yan Ping
Published: February 2012

A novel nucleating agent for polyoxymethylene (POM) was successfully prepared. The effect of nucleating agent on POM was characterized by using mechanical properties testing machine and differential scanning calorimetry (DSC). The results demonstrate that the addition of nucleating agent can improve the crystallization growth rate and mechanical properties of POM, and the nucleating agent maybe have potential application in POM field.
Structural and Magnetic Properties of Low Temperature Fired Ferrite/Ceramic Composite Materials
Authors: Ling Wei Wei , Li Yuan Xun , Nie Hai , Zhang Huai Wu
Published: February 2012

MgCuZn ferrite/CaTiO3and MgCuZn ferrite/BaTiO3composites which can be applied in low temperature co-fired ceramic (LTCC) technology were synthesized by conventional solid-state reaction at 950°C. The sintering behavior and microstructures of the samples have been analyzed. The complex permeability spectra of the above two composites have been investigated. The contribution of spin rotation and domain wall motion to the permeability spectra was estimated by the numerical fitting of measured data to the relevant formula. Influence of two types of magnetizing processes on the permeability of different composites has been analyzed combining with the variation of microstructures.
Effect of the Lactide/Glycolide Ratio and Molecular Weight of PLGA on the Bovine BMPs Microspheres Systems
Authors: Li Z.H. , Wu Ji Min , Zhao Y.L. , Guan J. , Huang S.J. , Li R.X. , Zhang X.Z.
Published: February 2012

The present investigation was aimed at optimization of BMPs loaded PLGA microspheres formulations resulting in improved encapsulation efficiency and sustained release of BMPs by varying the molecular weight and copolymer composition of PLGA. Double-emulsion solvent evaporation method was used to prepare the microspheres. The effect of polymer molecular weight and copolymer composition on particle properties and release behavior in vitro was reported. The particle size and encapsulation efficiency increased with increase in molecular weight and lactide content of PLGA. While BMPs release in vitro decreased with increase in molecular weight and lactide content of PLGA. SEM pictures revealed that almost all microspheres were spherical but internal morphology was different. The morphology of PLGA microspheres with exorbitant molecular weight(100kD) was anomalistic whereas the morphology of PLGA microspheres with higher glycolide content(50) have porous structures.
Removal of Refractory Organic Orange IV by Fe-Mn/GAC in the Presence of H2O2
Authors: Zhang Ying Jie , Liao Xia , Xu Shu Fen , Li Da Peng , Hu Qing
Published: February 2012

A new heterogeneous catalyst Fe-Mn/GAC (iron and manganese were loaded into activated carbon particles) was prepared, which had a better catalytic reactivity to decompose H2O2 compared with Fe/GAC and Mn/GAC. The removal rate of Orange IV increased more than 10% with this catalyst compared with Fe/GAC and Mn/GAC. The effect of the initial concentration of H2O2, the initial dye concentration, the initial catalyst concentration, the initial pH and temperature on the reaction rate constant were also studied. The activated energy for Fe-Mn/GAC catalyzed oxidation of the dye was determined to be 66.16KJ/mol. Reuse of catalyst did not decrease the removal rate of Orange IV. The tert-butanol experiment indicated that there were not only hydroxyl radicals but also other active species in the system.
Epoxy Resins Treated with Metal-Containing Flame Retardant
Authors: Gao Ming , Sun Ying Juan
Published: February 2012

A novel cheap macromolecular intumescent flame retardants (Zn-MIFR), was synthesized, and its structure was a caged bicyclic macromolecule containing phosphorus-silicon characterized by IR. Epoxy resins (EP) were modified with Zn-MIFR to get the flame retardant EP, whose flammability and burning behavior were characterized by UL 94, limiting oxygen index (LOI), dilatation, char yield, smoke density rating (SDR) and maximum smoke density (MSD). The epoxy resins were obtained for the UL 94 V-0 rating at low Zn contents of 3.0 % get a LOI of 27.5% and char yield of 20.5%. Dilatation, SDR and MSD of EP/Zn-MIFR decreased. The degradation behavior of the EP/Zn-MIFR was studied by TG and EDX analysis. The experimental results exhibited that the initial decomposition temperature (IDT) was decreased, integral procedure decomposition temperature (IPDT) and amounts of Zn and P at the residue were increased.
Study on Coating Surface Topography and Properties of Coated Paper Related to Pigment
Authors: Li Ying , He Bei Hai
Published: February 2012

The physical structure and chemical properties of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on coating layer structure and surface properties was investigated. The surface topography was explored using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. The conclusions were drawn that coating could improve coating surface topography and calcium carbonate pigment compared with kaolin pigment was not good to the paper surface properties, which resulted in high roughness, low paper gloss, high ink absorption and low paper surface efficiency.
A New Improved Adaptive Algorithm in Gravity Anomaly Processing
Authors: Luo Cheng , Li Hong Sheng , Zhao Li Ye
Published: February 2012

In order to effectively eliminate the measurement and system noise and improve the accuracy of the gravity anomaly, based on the sage-husa filter, a modified adaptive Kalman filter is proposed. The sum of the weighted innovation sequence is used as the innovation at current time, and then system parameters Q and R can be estimated by the innovation. The adaptive algorithm is conducted theoretically and based on the real gravity data, the de-noising experiment has been emulated. The simulations indicate that both filters can effectively inhibit the noise of inertial/gravity system, but the proposed filter has a better performance than sage-husa adaptive filter.
Application of Adaptive Kalman Filter Technique in Initial Alignment of Single-Axial Rotation Strap-Down Inertial Navigation System
Authors: Shang Song Tian , Gao Wen Shao
Published: February 2012

In order to improve the accuracy of initial alignment which determines the accuracy of navigation, a Sage-Husa adaptive kalman filter algorithm is applied to SINS initial alignment of single-axis rotation system. The simulation result further shows that in the case of inaccurate statistical property of noise, the estimation accuracy of Sage-Husa adaptive kalman filter is better than the conventional kalman filter.
Design and Implementation of Visible Human-Machine Interface for Trajectory Tracking in Agriculture Vehicle Navigation
Authors: Liu Xiao Guang , Hu Jing Tao , Hu He Chun , Bai Xiao Ping , Gao Lei
Published: February 2012

This paper designs a visible human-machine interface for field computer in an agriculture vehicle navigation control system. Field computer, with the function of system configuration, vehicle configuration, steering configuration, job management, path planning and map views, is the human-machine interface in agriculture vehicle navigation control system. This paper introduces the design of map views including field view and machine view for field computer system based on coordinate conversion. Field View gives a bird’s eye view of the map. The agriculture vehicle moves while the map keeps stationary. Machine view keeps agriculture vehicle in center of screen, while the map moves along the reverse direction of the agriculture vehicle.
Development of Intelligent Comprehensive Test System for Aeroengine Electrical Control System
Authors: Jia Jian Ming , Cheng Yao Hui
Published: February 2012

This paper proposed an intelligent comprehensive test system for the aeroengine electrical control system, which can fulfill LRU (Line Replace Unit) data collecting and data processing automatically, be applicable to the logical function and performance inspection of aeroengine electrical control system in difference aircraft.The whole structure and operating principle is introduced. By testing, this system can proceed the all-directions performance test with important significance for ensuring flight safety. It has been successfully used in workshop.
Vector Control System of Asynchronous Motor Based on Fuzzy Logic
Authors: Liu Jing
Published: February 2012

Considering the characteristics of vector control system, a speed controller based on fuzzy logic is presented in this paper. Using the fuzzy reasoning, we can update the output of the speed controller real time and handle the uncertain information. Results of simulation are provided to demonstrate that the vector control system of asynchronous motor based on fuzzy controller not only has the feature of simple and easy to be implemented, but also has the dynamic performance and robustness.
Analysis on Static Stiffness of Synchronization Torsion Bar Based on Finite Element Method
Authors: Wang Gang , Wang Fang , Chen Hong
Published: February 2012

Synchronization torsion bar is a key part in independent and dependent impression mechanism which ensures synchronization motion at both ends of blanket cylinder. Due to frequent action of the mechanism in high-speed printing, synchronization torsion bar would cause huge impact torque so as to affect parallel shifting of blanket cylinder and uniformity of printing impression. Based on structure features and force of synchronization torsion bar, finite element model of synchronization torsion bar was established by adopting structural mechanics and finite element method, then static stiffness of synchronization torsion bar was solved by adopting principle of minimum potential energy. The result of computation shows that the maximum torsion deformation of torsion bar in X direction happens at the left connection point. Because the deformation is very small, the bar can meet the requirements that blanket cylinder.
The Auto-Control of pH Value Based on Labview
Authors: Ren Guo Qiang , Zhang Bo , Lian Ya Fei , Zhang Zi Sheng
Published: February 2012

Grounded on Labview platform, the grid of technology of solution pH value contributes to a new device----the auto-control technology of solution pH value. This device is easier to operate just by the parameter input in the interface. And it breaks the limit of single admeasuring apparatus, meanwhile adopts the method of picking the average value by multi-metering, which avoids the delay effect caused by solution mixing link. The Acid precipitation-Flocculation process in paper making sewage sets an example for the pH value auto-control and supports PAC control of pH value with software concept..
The Clamping Force of a Deepwater Flange Connecting Tool and the Bearing Capacity of the Pipeline
Authors: Liu Ming Zhu , Bin Long , Wang Ke Kuan
Published: February 2012

A clamping mechanism for use in relatively the bearing capacity of the pipneline is described. The force analysis of the clamping mechanism is performed according to the operation of the deepwater flange connecting tool, and the clamping force of the clamping mechanism is determined according to the ultimate working condition of the deepwater flange connecting tool. At the same time, the strength and stability of the pipeline are also calculated using the thin-wall strength theory, and it is proved that the clamping force of the clamping is appropriate. The findings provide a theoretical basis for structure design and optimization of the clamping of the deepwater flange connecting tool.
1/3 Subharmonic Resonance of the Electro-Conductive Beam in Thermal-Magneto-Elasticity Field
Authors: Xi Xiao Yan , Yang Zhian , Li Gao Feng
Published: February 2012

Based on the electro-magneto-elastic theory and the theory of the bending vibration of the electric beam, nonlinear vibration equation of current-carrying beam in thermal-magneto-elasticity field is studied. The Lorentz force and thermal force on the beam are derived. According to the method of multiple scales for nonlinear vibrations the approximation solution of 1/3 subharmonic resonance of the system is obtained. Numerical analysis results show that the amplitude changed with the system parameters.
Techniques of Fragment Numerical Simulation of Armour-Piercing Warhead Penetrating Target Process Base on AUTODYN
Authors: Huang Jun Qing , Zhang Wei , Yang Xue Hui , Wang Wen Yue
Published: February 2012

Needing to analyse fragment’s destructive effect for military researching purpose, it is produced after armour-piercing warhead penetrate target. How to reduce physical test expense and acquire believable researching result at the same time have been puzzled problems that must be solved as soon as possible. Discussing techniques of fragment produced in armour-piercing warhead penetration process with the way of numerical simulation based on AUTODYN, it is a program that analyses dynamics in this paper. Techniques mainly include the Lagrange, the SPH, the Lagrange combining with the SPH and the Lagrange combining with restriction invalidation, at the same time, analysed different technique’s merit and demerit by establishing the numeric simulation model of armour-piercing warhead destroying target and obtaining simulation result. By researching the technique of making numeric fragment, establishing favorable base for researching armour-piercing warhead destroying mechanism.
Research and Design for Terminal Display System of Digitized Tank Integrated Simulator
Authors: Xue Qing , Luo Jia , Liu Yong Hong , Zheng Chang Wei
Published: February 2012

The terminal display system is a basic component of digitized tank integrated simulator. The combination of VAPS platform which is installed on PCs with VC++6.0 development environment is the basis of simulation system. And work in practice that can not only reduce design costs but also shorten design cycles. First, the structure, design concepts and realization methods of this simulation system are introduced. The system architecture diagram and the development process are given later. The research of several key issues is focused on, including the display of simulation interface as well as external drivers, and finally the development of the terminal display system for the tank integrated simulator is achieved so that met the demands for training purpose.
Design Method of Self-Loading Device of the Side-Crane Used for Container
Authors: Zhan Jun Qing , Feng Xiao Mei , Li Li Shun , Meng Xiang De
Published: February 2012

The self-loading device used for side-crane is put forward. Its structure is presented. Based on the force analysis when the side-crane works at flat ground, the mathematical model is established when the crane working at uneven ground. And the design calculation is performed. The self-loading device’s optimal design is accomplished. Based on the above calculation results, the self-loading prototype is manufactured. And the design method can be adopted to the similar equipment’s structural design.
Suboptimal Control Theory for Vehicle Attitude Control System Design
Authors: Fan Guo Long , Liang Xiao Geng , Fan Yong Hua
Published: February 2012

Base on the Lyapunov stability theory, an improved suboptimal control system scheme is advanced in this paper. Aiming at hypersonic reentry vehicle nonlinear properties of the actuator deflection angle rate and the deflection angle were studied. First, the mathematical model of the control system is established according to the flight control system control scheme. Considering the project realize easy, the flight control system is designed based on suboptimal control of Lyapunov stability theory. In order to close to the optimal control, then the suboptimal control design is improved. Finally the controller is applied to the instances, by analyzing the results confirmed the method is correctly.
Adaptive PID Controller Based on Single Neuron
Authors: Qiu Xin Yun , Gao Yuan
Published: February 2012

An adaptive PID controller based on single neuron is proposed. The properties, control algorithm, parameters tuning, the control law and the application condition of the controller are studied in the paper. To satisfy the properties of the requirements of the control system in an electromotor group, such as a broad dynamic changing range, a fast response, a little overshoot and time-variable parameter, a new-type self-optimizing PID controller based on artificial neural networks is proposed and studied. It is verified that the controller has few adjustable parameters and excellent robust performance. The results of simulation and experiment prove that the controller is superior to the traditional PID controller.
MEMS Gyro Signal De-Noising Based on Adaptive Stationary Wavelet Threshold
Authors: Yang Xing Hui , Ren Jian Xin , Zhao Xing Mei , Chen Ran
Published: February 2012

Random drift is a significant index that can affect the precision of MEMS gyroscope. It is one of the important techniques to decrease the random drift error in improving the precision of MEMS gyro. According to analyzing the principle of traditional Wavelet Transform and Stationary Wavelet Transform, Stationary Wavelet Transform (SWT) is adopted to de-noise the signal of MEMS gyro. Due to SWT’s time-invariant, the Gibbs phenomenon is decreased. SWT with adaptive threshold is adopted to analyze the actual dynamic MEMS gyroscope data. The experimental results show that this presented method is better than traditional wavelet threshold de-noising methods. It can effectively restrain the noise in high frequency and improve the drift error of MEMS gyro.
Springback Analysis of TC4 Titanium Alloy Complex Part with Double Curvature under Single Point Incremental Forming Process
Authors: Li Fen Qiang , Mo Jian Hua
Published: February 2012

To make the structure of aircraft meet the aerodynamic requirements, complex lightweight structures such as double curvature shape and high-strength lightweight materials such as titanium alloy are generally used in design and forming of aircraft skin parts. But the forming processes and problems aimed to this kind of parts remain to be investigated further now. In this paper, based on single point incremental forming process, the TC4 titanium alloy aircraft parts with a complex double curvature was studied. In order to reduce the springback during the forming process an appropriate addendum surface was added to the part surface, and then ABAQUS software was applied to carry out numerical simulation of the forming and springback process. The results show that springback of complex titanium part with double curvature is small at both ends of part while large in the middle and the distribution of springback orientation depends on the curvature. For that the part is difficult to form by single point incremental forming process without springback compensation, so the tool path needs to be improved firstly. The simulation results can play a role for guiding the parameters selection and the compensated surface design of single point incremental forming process which can achieve the cold forming of parts with complex structure for poor formability materials.
Study on Enhancement Adsorption of Pipemidic Acid from Aqueous Solution by Using an Amino Group Modified Hypercrosslinked Polymeric Adsorbents
Authors: Ma Jiang Quan , Xia Jun Hao , Lu Qing Ling , Shi Peng Xiang , Lu Lu De , Wang Xin
Published: February 2012

In the present study, an amino group modified hypercrosslinked polymeric adsorbent RDM-200 was prepared and its ability to adsorb pipemidic acid from aqueous solution was tested by using Amberlite XAD-4 as a comparison. Pipemidic acid adsorption isotherm onto RDM-200 is well described by the Freundlich model. The RDM-200 adsorption capacity for PPA was about 510.5 mg/g at 293 K, exhibited larger uptake and stronger affinity of pipemidic acid than XAD-4. The adsorption thermodynamic parameters were calculated and the adsorption was an exothermic, favorable, and more ordered process. The RDM-200 spontaneously adsorbs pipemidic acid mainly by both entropy change and enthalpy change. The RDM-200 exhibited excellent adsorption ability over the pH range 6-10, NaCl showed the positive effect.
Research on the FBG Automatic Testing and Controlling System Based on Virtual Instrument Technology
Authors: Jin Xiu Mei , Lei Yu , Wan Tao
Published: February 2012

Most civil engineering structures have long service life and situate in severe environment. So it is the key to carry out testing task continuously according to scheduled demands for the long-term monitoring based on FBG sensing. But the existing instruments cannot satisfy the long-term and remote testing demands. Based on virtual instrument and remote panel technique, the automatic testing and controlling system for FBG sensor array were developed. Modularization programming method was adopted and the control program can be adjusted according to practical demands freely. The testing system can save and figure the results automatically, and it can also discern and process the error signal. These extend and perfect the function of traditional FBG demodulation instrument, and make the testing system more flexible and reliable. It greatly reduces the difficulties in remote and long-term testing task.
Development and Experimental Study of New Working Fluids for Moderate-High-Temperature Heat Pumps
Authors: Liu Shi Jie , Yu Wen Sheng , Chen Wu
Published: February 2012

Some suggestions for developing new working fluids for moderate-high-temperature heat pump with excellent thermal and environmental performance were given firstly in this paper. The theoretical and experimental performance analysis of new-developed working fluids M1-M6 was carried out. The theoretical performance results showed that M1-M6 had high heating efficiency and GWP (Global Warming Potential) of M2 was less than 150. The experimental results showed that M5 had higher thermal efficiency than other two working fluids under same working condition. At the ambient temperature respectively of 30 Centigrade Degree and 40 Centigrade Degree, it took 70 and 65 minutes by the heat pump charged with M5 as working fluid to heat 100 liters of water respectively from 30 Centigrade Degree to 80 Centigrade Degree. Meanwhile the system’s COP (Coefficient of Performance) was respectively 2.9 and 3.0.
Theoretical Research of Measuring the Kinetic Energy for Swarm of Fragments with Six-Light-Screen Array
Authors: Tian Hui , Ni Jin Ping
Published: February 2012

Aimed at the measurement of kinetic energy for swarm of flying fragments, a measuring method of kinetic energy for the flying fragment using six-light-screen array was presented in this paper. When a fragment pass through the six light screens, the six-time sequences, can be gathered in turn. Lots of fragments can generate some sequence of six-times. The algorithm that can distinguish the sequence from a group of sequences of time is put forward in this paper. According to the coordinates of fragment position on a position indicator as well as all the sequences of the fragments, the real time sequence can be distinguished and recognized. Then the real velocity and accurate location of the fragment can be calculated with the algorithm designed, and the kinetic energy of fragments can be measured. The algorithm is proved accurate and effective by the simulation.
Study and Simulation of the Fluidization Quality of the Concrete Mixer Truck
Authors: Zhou Ji , Jiang Yong Yang
Published: February 2012

The paper is focused on some type of bulk cement tank truck, proposed to several research programs to improve the fluidization quality. Created the fluidization models of the fluidized bed in the CFD software FLUENT, then simulated for improved fluidization process, and given the analysis for fluidization quality. The syntheses optimize effect which adopt 40°side splitter board, with curve fluidization board substitute rectangle board as well as use larger gasinlet velocity are able to improve the fluidization quality of the cement in tanker. This plan can be used to all bulk materials vehicles giving priority to concrete mixer truck.
Development of the Kneading Mixer of Synthetic Diamond Electrolysis Residue and its Control Device
Authors: Yao Ya Lin , Luo Zhong Ping
Published: February 2012

This paper introduces the mechanical construction, operation principle, performance characteristics and the using result of physical impurities removing and purification technology of the kneading mixer, which is specially developed and particularly suitable for disintegrating and refining of synthetic diamond electrolysis residue. In order to avoid the slipping of materials in the tank and impacting the effect, non-slip kneading bar is especially equipped in the tank; the main shaft of helical mixing blade is driven by motor drive variable-speed system (speed control system), the mechanical strength is adjustable; running cycle is automatically controlled and adjustable, and the impact of human factors is excluded. Industrial tests and production applications show that the design of the machine achieves the desired results.
Simulation and Analysis on the Effect of the Antiroll-Bar on the Automobile Steady State Response
Authors: Lv Zheng Bing , Yang Hai Peng
Published: February 2012

The effect of the antiroll-bar on the automobile steady response is analyzed through the theory of automobile steady response. And a model of a whole vehicle is established utilizing ADAMS/Car, then a dynamical equivalent of the stabilizer bar is built by modifying the spring stiffness of suspension, and a simulation test, which is called constant radius cornering, is executed. The test result shows that the stabilizer bar can prove the automobile steady response and thus betters the automobile handling stability, and that the ADAMS software has the ability of executing accurate simulation test.
Multi-Parameter Monitoring System Design of Modern Facility Agriculture
Authors: Hu Shan , Cui Shi Gang , Wang Hui , Shen Li Yun
Published: February 2012

According to the request of the facility agriculture, the parameters acquisition system is designed, into which the temperature, humidity, CO2 concentration and illumination have been integrated. The light source control system for adjusting LED spectrum is designed together with relation of the plants and LED optic character, used as the supplementary lighting source of plant environment. The monitoring system replaces of traditional manual monitoring mode, so the automation has been improved greatly. Based on the different plants, different LED spectrum is employed to irradiate the plants, which is benefit to the plant growth. Experiments show that whole system works stably, temperature error is ±2.4%, humidity error is ±3.1%, CO2 concentration error is ±0.7%, illumination error is ±1.9%, and the LED spectrum can be adjusted in 255 grades automatically or manually.
Dynamic Behaviour of a Novel Compliant MEMS Force Amplifier by MATLAB/SIMULINK
Authors: Kosa Ergin , Trabzon Levent , Sonmez Umit
Published: February 2012

High force amplification in micro-scale can be achieved by MEMS compliant systems and such systems have been recently preferred to obtain high output forces in micro actuators due to its monolithic structure and ease of fabrication. We studied the mechanism of novel MEMS force amplifier in dynamic mode by modeling its rigid body mechanism with Matlab/Simulink programming. Kinematic analysis and dynamic response of the MEMS compliant system was obtained by modeling of velocity and acceleration parameters, and ramp input function, respectively. We found that the output force goes to infinity at zero-crank angle and there is 2650 times force amplification by a given very small crank rotation about 2.30.
Empirical Study on the Independent Director System' Effectiveness on the Corporate Performance of Listed Companies in Shenzhen Stock Exchange
Authors: Wang De Lu , Liang Ping Juan
Published: February 2012

This essay has chosen 568 companies listed in Shenzhen Stock Exchange (SZSE) as research samples. And it empirically analyzed the independent director system' effectiveness on the corporate performance. The result indicates that the proportion of independent directors is not significantly correlated with corporate performance, and that the independent directors' compensation is significantly positively correlated with the company’s performance and that the meeting attendance of independent directors is not significantly positively correlated with firm’s performance. At last, two proposals are put forward: firstly, broaden the company information's delivery channels to independent directorst; secondly, perfect the incentive and constraint mechanism of independent directors
A New Test Part for Detecting Processing Accuracy of Five Axis CNC Machine Tools
Authors: Shi Rong Bo , Yan Ji Ming , Guo Zhi Ping , Song Zhi Yong , Peng Zhi Jun
Published: February 2012

Five axis linkage CNC machine tools, with its high speed, high precision characteristics, are widely used in large aircraft structure part machining. By trial cutting method, "S" test part is a new test part for detecting processing accuracy of five-axis linkage machine tools. Through analysis and simulation, exploring the influencing factors to CNC machine tools processing accuracy and the regular of "S" test part surface errors, surface quality, results show that "S" test part can reflect the processing accuracy of CNC machine tools.
Effects of Gelcasting Parameters on the Solids Loading of Ti-6Al-4V
Authors: Ye Qing , Hao Jun Jie , Guo Zhi Meng , Ru Min Chao
Published: February 2012

Ti-6Al-4V green body was processed by gelcasting. Effects of the powder morphology, dispersant and pH on the solids loading were investigated. The morphological properties were investigated by SEM. The results show that the powder morphology is the overriding factor in slurry processing. Slection of dispersant and pH are another two critical factors affecting the solids loading by a percentage of 2 to 4. With optimum conditions: spherical powders, 1.5 wt.% ammonium citrate as the dispersant and pH=11, the green body with high solids loading of 59.4% was prepared.
Study of the Control of Active Transfemoral Prosthesis Based on CPG
Authors: Geng Yan Li , Yang Peng , Chen Ling Ling
Published: February 2012

Commercial transfemoral prostheses remain limited to energetically passive devices. Intelligent prostheses still do not replace the power generation capabilities of the missing limb. Active Transfemoral Prosthesis is designed to compensate the movements of transfemoral amputees. Base on the function and principle of huaman lower limb, Active transfemoral prosthesis is designed. Virtual prototype of active transfemoral prosthesis 3D model is built through Solidworks. A dynamical system is used to generate a position trajectory to control a linear motor replacing the missing joint. Hopf oscillator is used to construct a central pattern generator (CPG), which makes up the dynamical system.
Forecasting the Exchange Rate Using the Improved SAPSO Neural Network
Authors: Meng Li , Dong Li Jun
Published: February 2012

The paper researches on the behavior of particles in the PSO, and improves the situation of easily falling into local optimum by the right combination of simulated annealing and PSO. In the paper, the author compared the original PSO and the improved SAPSO algorithms in neural network training. The empirical research shows that the improved algorithm performed better than the PSO algorithm in global search ability, and the prediction accuracy is greatly increased.
Fire Hazard Factors of Residential-Commercial Composite Buildings through Fire Hazard Cases
Authors: Shao Yang Wei , Kao Shih Feng , Yu Neng Chun , Wu Yu Shiang , Huang Chi Jan , Chang Kuan Yung
Published: February 2012

Although meeting the regulations of the time, early buildings are prone to fire hazards, such as damages to the fire zones, changes of floor entrances and exits, locked emergency exit doors, blocking of entrances and exits by vehicles, increased fire sources, dense population in the buildings, due to insufficient professional knowledge and technology in fire prevention. Once a fire occurs, it can result in major casualties, serious loss of social costs, as well as environmental and social issues. This study investigated 17 major fire cases occurring in residential-commercial composite buildings in the last 20 years in Taiwan. The fire hazard factors were determined based on expert review. The findings can serve as a reference for fire agencies in promoting fire prevention.
Experimental Study on the Performance of a Natural Gas Engine
Authors: Sun Xiao Na , Zhang Hong Guang , Zheng Guo Yong
Published: February 2012

Power performance tests of natural gas engine were carried out using a self-dependent developed electronic injection system and ignition system, and a comparative analysis between the natural gas engine and original gasoline engine was conducted. The result shows that if the gasoline engine is fueled with NG torque of the engine decreases and with the throttle opening increases, the decrease amplitude increases. Developing a suitable electronic ignition system can recover engine torque to some extent. Under the conditions that both throttle opening and rotation speed of the engine are constant, MBT angle increases with the decrease of mixture concentration.
The Research on the Hydraulic-Control System for the Heave Compensation under the Deepwater Installation
Authors: Zhao Teng , Sun Peng , Ding Yong
Published: February 2012

Based on the heave compensation system during the installation in the deepwater, the performance of the hydraulic unit and the control unit is researched .The mathematical models which is about the flow characteristics ,the load pressure and the Mechanics balance on the hydraulic- Control system are built, and then the models are simulated by using the PID control method. The simulation results are showed under the different levels, and the best match of the control parameters is found by the different objects，to realize the intelligent designing in heave compensation system.
Measurement of the Depth Distance Based on the Binocular Stereo Vision
Authors: Hou A Lin , Geng Ying , Cui Xue , Yuan Wen Ju , Shi Feng Guang
Published: February 2012

The measurement system of the depth distance based on binocular stereo vision is proposed. The model of camera imaging is established and the process of camera calibration is described. Interior and external parameters of two cameras are calculated by HALCON. Then the depth distance can be obtained by the parallax measurement of the image pairs. The simulation experiments have been done and the results demonstrated that the measuring method is feasible.
The Significance and Implication of Control Object's Self-Balancing Applied in Turbine Governor Control
Authors: Rong Hong , Zhu Xiang , Zhang Lei , Chen Deng Shan , Chen Xiao Yong , Qian Feng , Xu Dong , Cai Wei Jiang , Cai Xiao Feng
Published: February 2012

This paper introduced the transmission links behind the turbine governor controller output link, and elaborated the interaction between these transmission links. Based on the example, the paper considered the universality of controlled object’s self-regulating and self-balancing from a new perspective, and cited how to use these common and convergence regular pattern ‘intentionally or unintentionally’ in turbine governor control. At last, the paper proposed some ideas of turbine governor control system design, and suggested how to deeply understand and use self-balancing ability of control object.
Improvement Measures and Evaluation of Energy Efficiency of Air Conditioning
Authors: Zhang Hong , Zhao Jia Ming
Published: February 2012

Air conditioning and refrigeration equipment are more and more widely applied, It’s energy efficiency proportion of total energy consumption is growing. To evaluate energy efficiency and apply high grade energy efficiency of air conditioning , that can bring considerable economic benefits and improve energy-saving initiative for the enterprises. This has great practical significance to realize Chinese energy-saving task. In this paper the air conditioning energy efficiency ratio(EER), seasonal energy efficiency ratio(SEER) and integrated part load value(IPLV) are proposed and analyzed, Many evalution methods are put forword to provide appropriate evaluation criteria for enterprise, and the energy-saving measures on the different assessment criteria are also put forward, It has some guiding significance to improve the efficiency of air conditioning and refrigeration equipment.