bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Dynamics Characteristics of Elastic Wave of Weathered Zone in Longmen Grottoes
Authors: Ding Wu Xiu , Wang Hong Yi
Published: September 2011

Based on the test results, the wave velocity and the attenuation rule of elastic wave of weathered zone in Longmen Grottoes are studied. The wave velocity decreases with the increasing of the attenuation coefficient in a certain range. When wave velocity decreases to a certain value, there is not a relationship between wave velocity and attenuation coefficient. The attenuation coefficient thresholds of P-wave 0.01and S-wave 0.1 separate good rockmass quality from poor rockmass quality. The test results show that the elastic wave velocities of the surrounding rocks are generally high, which indicates that the rockmass skeleton is solid. But the rockmass anisotropy is obvious, which indicates that the structure planes are more developed. The results of the study are important for the protection of historical relics.
Attenuation-Type and Failure-Type Curves of Cyclic Accumulated Deformation Models in Saturated Normal Consolidated Clay
Authors: Zhao Chun Yan , Zheng Guo Yong
Published: September 2011

Based on dynamic triaxial test results of saturated soft clay, influence factors and variations on accumulated deformation were analyzed. The Parr’s equation on accumulated deformation was modified to create an attenuation-type curve model on accumulated deformation of saturated normal consolidation clay. In this model, dynamic strength was introduced and a new parameter called equivalent dynamic stress level was added. Besides, based on comparative analysis on variations between failure-type and attenuation-type curves, a failure-type curve model was created on accumulated deformation of saturated normal consolidation clay. The two models can take cycle number, coupling of static and dynamic deviator stress, consolidation way into consideration. The models were verified by test results. The correlation coefficients are more than 0.96 for optimization of test results based on the two models, and there is good agreement between optimized and test curves, which show that the two models are suitable to predict variations of accumulated deformation under different loading cases and consolidation ways. In order to improve prediction accuracy, it is suggested that loading cases and consolidation ways should be consistent with in-situ conditions when dynamic triaxial tests being used to determine the constants in the models.
Effect of Physical Fields on Solidification Structures of DC Casting AZ80 Magnesium Alloy Billets
Authors: Zhang Zhi Qiang , Le Qi Chi , Cui Jian Zhong
Published: September 2011

AZ80 magnesium alloy was semi-continuously cast under different physical fields which were conventional direct chill (DC) casting, low frequency electromagnetic casting (LFEC), ultrasonic casting (USC) and electromagnetic-ultrasonic combined casting (ECUC), respectively. The effect of different physical fields on solidification structures of AZ80 alloys was investigated. The results show that compared with the conventional DC casting, structures of AZ80 alloys billets cast with LFEC and USC have been greatly refined. The effective refinement takes place in the edge of billets when LFEC is applied. However, the effective refinement takes place in the center of billets when USC is applied. When combination of low frequency electromagnetic and ultrasonic fields is applied during semi-continuous casting AZ80 magnesium alloy billet, structures of AZ80 alloys are refined significantly in the whole billets everywhere and more uniform.
Analysis on Intelligentized Project of Airport Terminal
Authors: Zhao Jia Ni , Wei Jian , Yao Hong Guang
Published: September 2011

As it involves the safety of flight and passenger’s life, requirement for intelligentized project construction of airport terminal is considerably high. We firstly analyze the basic structure of intelligentized project for airport terminal, subsequently make mainly research on the three sub-systems included in the dedicated civil aviation intelligence system, further analyze the latest developing trend of the current international intelligentized airport terminal system, and in the end, make strategic proposals with a view to solve the problem in the country’s terminal-junction airport intelligentized construction. This research will be sound reference for intelligentized airport terminal construction.
Mechanical Strength Characterization for Silicon-to-Silicon Direct Bonding
Authors: Yan Xin , Zhao Yan Li , San Hai Sheng , Yu Yu Xi , Chen Xu Yuan
Published: September 2011

In this paper, silicon direct bonding was performed by two different cleaning processes, and the bonding quality was obtained by tensile test and IR test. For (100) P-type double side polished wafer, the optimum process condition was established with respect to the results of two different cleaning processes. The cleaning process of NH3•H2O/H2O2/H2O (Standard Cleaning 1, SC1) after the H2SO4/H2O2 (piranha solution) was found to be better suited for high bonding quality. The bonding strength of the SC1-cleaned samples is about 5.4 MPa with partially crack but no more than 0.7 MPa for the only piranha solution cleaned samples.
Geometrically Nonlinear Free Vibrations of Laminated Composite Beams: An Effective Formulation
Authors: El Bikri Khalid , Merrimi El Bekkaye , Benamar Rhali
Published: September 2011

The purpose of the present paper is to show that the problem of geometrically non linear free vibration of symmetrically and asymmetrically laminated composite beams with immovable ends can be reduced to that of isotropic homogeneous beams with effective bending stiffness and axial stiffness parameters. This simple formulation is developed using the governing axial equation of the beam in which the axial inertia and damping are ignored. The theoretical model is based on Hamilton’s principle and spectral analysis. Iterative form solutions are presented to calculate the fundamental nonlinear frequency parameters which are found to be in a good agreement with the published results. The non-dimensional curvatures associated to the fundamental mode are also given in the case of clamped-clamped symmetrically and asymmetrically laminated composite beams.
The Simplified Calculation of the End Moments for Steel Frames with Semi-Rigid Connections
Authors: Hu Zhang Qi , Lv Wei Rong , Li Yuan , Wang Chao Fei
Published: September 2011

In the structure design, the definition of the joints had a great impact on the structure internal force distribution, thus affecting the whole structure design. In the traditional design of steel structures, the beam-column joints were always considered as completely rigid connections or ideal hinged connections, but it is usually not in accord with the practical situations. According to the existing formulas, the simplified formulas for the end moments of semi-rigid connections have been proposed, the semi-rigid connections will also be discussed. The formulas proposed in this paper are applied to the auxiliary beam-column joint design, which is part of the counterforce frame design. It is hoped that the formulas can provide a reference for the steel frame design. Keywords: semi-rigid connections, end moments, internal forces distribution, steel frame design
Flame Retardation of Natural Bamboo Fiber/ Polypropylene Fiber Non-Woven Materials
Authors: Ma Wei , Yao Wen Bin
Published: September 2011

According to Natural Bamboo Fiber/ Polypropylene fiber(PP) non-woven materials encountered the problem that its flame retardation is insufficient, this paper tried to add flame retardant to improve its performance, then the cone calorimeter was used to evaluate its flammability. The results show that Peak-Heat Release Rate and Smoke Release Rate etc significantly improved. In accordance with the UL94 ,the flame retardation meet the level V-0 , consistent with the requirements of enterprise.
Influence of Subjection to Plasma Nitriding Surface Modifications on Ultra-High Cycle Fatigue Behavior of Ti-6Al-4V
Authors: Wu Yan Zeng , Wang Qing Yuan , Ouyang Qiao Lin
Published: September 2011

Using the ultrasonic fatigue test method, the influence of subjection to plasma nitriding surface modifications on the ultra-high cycle fatigue behavior of Ti-6Al-4V was investigated, then a comparison with corresponding behaviors of the normal Ti-6Al-4V was made. The results show the S-N curve of Ti-6Al-4V with plasma nitriding surface modifications still continuously declines, no conventional fatigue limit exists for Ti-6Al-4V. Plasma nitriding surface modifications enhance surface hardness, but they make the material fatigue strength decrease by about 17 %. The fractography of fatigue failure has been observed by scanning electron microscopy. The observation shows that fatigue failure initiates from internal of specimen after the fatigue life of 108cycles and fatigue cracks mainly initiate from the surface of specimen before the fatigue life of 108cycles.
Discussing the Syntheses Table of the Standard Amino Acid Based on the Graph Theory
Authors: Shi Xiao Hong , Wang Xiang Hong
Published: September 2011

We discussed the syntheses table of the standard amino acid based on the graph theory that transformed the syntheses table into a network graph and using the connected-graph concept to discuss the performance of the table based on the various classification results. Finally, we selected a set with 29 specific representative classifications of twenty amino acids to calculate each connected-rate and on average connected-rate of 29 specific reached to 0.944. It means the similar amino acid have been arranged together and get a suitable position in the table, meanwhile the performance of this table reached our required
Corrosion Behavior of HRB400 Reinforcing Steel Based on Electrochemical Impedance Spectroscopy
Authors: Xu Yu Ye , Lin Bi Lan
Published: September 2011

Electrochemical impedance spectroscopy (EIS) technique was used to investigate the corrosion behavior of HRB400 reinforcing steel in Simulated Concrete Pore (SCP) solutions differently contaminated by bicarbonate ions and/or chloride ions. The corrosion kinetics parameters of the capacitance Y0-CPEdl, surface roughness n0-CPEdl and charge transfer resistance Rct of the electric double-layer capacitance of the interface of solution/HRB400 were analyzed and were compared to those of HPB235 reinforcing steel. The results show that the corrosion resistance index of HRB400 and HPB235 is increased with an increase in NaCl content to 0.1%, but that is decreased markedly for a larger NaCl content; and that of them is decreased largely with an increase in pH; the decrease extent of the corrosion resistance index of HRB400 with NaCl or pH is larger than that of HPB235; and the corrosion resistance of HRB400 is inferior to that of HPB235.
Experimental Study on Infrared Radiation Changes with the Fracture and Progressive Failure of the Submarine Soft Rock Roadway
Authors: Zhang Yong Jun , An Li Qian , Miao Xie Xing
Published: September 2011

Based on the submarine soft rock supporting engineering in Beizao Mine, the physical model tests of four kinds of supports were carried out including high strength (HS) roadway without support, HS soft rock roadway with U-shape steel support (U-S-S-S), low strength (LS) roadway with bolt support (B-S), and LS roadway with U-S-S. The thermal infrared (TIR) changes with the fracture and damage of roadway are investigated. It is discovered that the TIR radiation is the stronger in the stress concentrated area, strong friction and interaction range between U-steel support and roadway than that in the stress relaxed area and week friction. The TIR temperature (TIRT) of the fracture increased higher and changed rapidly than other parts. The TIR radiation of soft rock is influenced with seawater. The TIR-anomaly appears at the stress concentrated area, interaction ranges and fractures. The TIR omens occur when load is 65%~90% of the peak load.
Bi-Camera Ranger-Finder and Error Analyze Based on Binocular Parallax
Authors: Wang Zi Chen , Dai Ming , Huang Jing , Wang Yong Yang , Chen Xiao Lu , Gao Yu Jun
Published: September 2011

The traditional facilities that used to find range are mostly based on laser or ultrasonic. Now, based on binocular parallax of human eyes, we advance a method used to get the distance by measuring the offset on image panel. On this foundation, we also analyze the error in forward. The academic analysis indicate that the measurement would be impacted severely by transverse offset and angle-measuring offset, in contrast, much slightly by lengthways offset. When we put this facility into practice, this facility can suffice practical demand completely if we select the space between bi-camera and the focus of facility rationally.
Measurement of Micro-Mechanics Property of Cell Wall by Nano-Indention
Authors: Li Qing Lin , Mao Han Ping , Li Ping Ping
Published: September 2011

To investigate the micro-mechanics property of cucumber mesophyll cell wall, an experiment was conducted at nanolevel scale with the help of nanoindentation masurement system after the tissue of cucumber leaf has been treated of fixing,dehydrating,embedding,slicing for the mesophyll. Loading-unloading curve showed: the cell wall deformed elastically before the stress reach 1.0MPa, after that, the cell wall deformed plastically;It also can be seen in the range elastic deformation that the stress-strain is nonlinear relationship .
Ultrasonic Positioning Using Curve-Fitting Extrapolation and Redundant Information Fusion
Authors: Lu Li Bin , Chen Ding Xin , Jin Guo Dong , Li Rong Ming , Gao Ying Jie
Published: September 2011

To study the problem of high precision, the reason why error appears in the ultrasonic positioning process is analyzed. To decrease the effect of error, this paper raises the algorithm of curve-fitting extrapolation and redundant information fusion. The experiment and contrast on precision between this algorithm and other classical ones demonstrate that, the new algorithm could effectively control measurement errors and raise the precision of ultrasonic positioning.
Reliability Analysis on Errors of Measuring Residual Stress in 7050 Aluminum Alloy with X-Ray Diffraction
Authors: Feng Ai Xin , Li Bin , Xu Chuan Chao , Wang Jun Wei , Han Zhen Chun , Shi Fen
Published: September 2011

The error distribution of residual stress tested by X-ray diffraction on 7050 aluminum alloy was studied. In this paper, residual stress was measured, independently and repeatedly, many times on 7050 aluminum alloy with X-ray diffraction, then the errors about 50 stress values within the range of 30MPa were analyzed by the hypothesis testing. The results indicate that the errors of the residual stress measurement on 7050 aluminum alloy were followed the law of normal distribution about and the errors can be estimated by the least square calculator. The research lays the foundation to subsequent researches on the inherent law of the residual stress measurement with X-ray diffraction and the residual stress distribution and accuracy of stress of material surface.
Opto-Spectrum Measurement and Analysis of Underwater Plasma Acoustic Source Pulse Discharge
Authors: Zhang Jun , Zeng Xin Wu , Wang Yi Bo , Chen Dan
Published: September 2011

Underwater plasma acoustic source (UPAS) with high voltage pulse arc discharge produced pressure wave has the advantage of adjustable pulse length, high source level output, and no pollution to the environment. In recent years, this kind of source has been gradually used in domain as long range target detection, geo-acoustic profile measurement, and frogman threats deposal etc. While for a fairly long time, we’re lack of research on the company product of sound—light. In this paper, we measured the opto-spectrum of UPAS by experiment, and found its spectrum is of continuous spectrum and its dominant energy is around 500nm, if we raise the discharge voltage, reduce the gap distance of the tips, the spectrum amplitude and half peak amplitude width will increase, and if we change steel tips with copper tips, the light energy distribution and amplitude of the spectrum will change.
A Zero TCF SAW Contact Stress Sensor in ZnO/SiO2/Si Structure
Authors: Ding Jie Xiong , Chen Dong , Du Li , Liu Guang Min
Published: September 2011

A thin sensor based on surface acoustic wave resonator (SAWR) in ZnO/SiO2/Si structure for wireless contact stress measurement in thin gap is numerically analyzed. Firstly, the scheme of the SAWR stress sensor and surface effective permittivity for analyzing surface acoustic wave (SAW) in ZnO/SiO2/Si structure are introduced. Then, the phase velocity and electromechanical coupling coefficient of ZnO(1µm)/SiO2(1.4µm)/Si structure for the fundamental and first Rayleigh mode are obtained. For both Rayleigh modes, the temperature coefficient of frequency (TCF) for the structure at different frequency is calculated. Good temperature stability for the structure is achieved at frequency 1GHz for the first Rayleigh mode with averaged TCF about 0.04ppm/°C and stress sensitivity about 22ppm/MPa.
The Parameters Calibration and Error Compensation of Circular Gratings for Parallel Double-Joint Coordinate Measuring Machine (CMM)
Authors: Zhang Xiao Wei , Li Xing Hua , Chen Bo
Published: September 2011

In this paper, the mathematical model with errors for parallel double-joint coordinate measuring machine (CMM) was proposed. The main factor of the impact of circular grating measurement error--radial install eccentric error--was analyzed. The error was measured and the data obtained from measurement was used to curve fitting and form the error compensation formula. Experiments show that the method of error compensation has good usability and accuracy.
Experimental Study of Angular Acceleration Sensor and its Error Analysis
Authors: Feng Hao , Zhao Hao , Ding Li Jun
Published: September 2011

For shaft angular acceleration is the key to rotary system state inspection and fault analysis, two new angular acceleration sensors based on the principle of electromagnetic induction are presented. When the angular acceleration component exist in rotary system, this component is output in the form of induced potential through electromagnetic coupling. The output voltage of sensor can reflect the changes of mechanical angular acceleration according to the experiment. The errors of sensor on actual working condition are analysed, and a new calibration method of sensor is presented, which affords technical support for the popularization and application of sensor.
A New Approach to Coiled Tubing Improved Inspection
Authors: Zhou Zhao Ming , Wan Fu , Mao De Sin , Xu Quan Chuan , Wei Chen Xing
Published: September 2011

Many of the NDT methods used for casing, tubing, drill pipe and line pipe are applicable, with some minor modifications, to CT. This article describes the requirements of an ideal in-service inspection. This paper presents a new wall thickness and ovality measuring method engineered for reliable field use. This method based on flux gate testing technology discussed in this paper .This method not only will detect internal flaws and the density of micro-cracks, but also wall thickness measurements will be made. This paper discusses the development of this new method, the detection of eddy current testing program is used in coiled tubing ovality measurements. The key technology is the production of amorphous alloy core. Using this method measure diameter, wall thickness and ovality of CT, is currently being developed.
Study on Uncertainty of Gas Monitoring Dynamic Calibration System
Authors: Fang Li De , Xiang Xiu Ming , Li Xiao Ting , Pang Li Li , Wang Xiao Jie , Liu Ran
Published: September 2011

With the rapid development of industry and transportation, air pollution is worsening, therefore, monitoring of air pollution components is more and more heeded. In this study, based on the measurement model and the composition of the air quality monitoring system on line, the mathematical model of the measurement system value transmission was analyzed, and the uncertainty components were calculated respectively, a conclusion that the main factor of the overall system uncertainty is the uncertainty of system itself in the existing air quality monitoring system was drawn, so measurement uncertainty of the calibration system was focused on the research. The effects of the Zero-gas, calibration gases and gas mass flow controller on the uncertainty of the calibration system was experimented and analyzed, and measurement uncertainty of the dynamic calibration system was evaluated.
Medium-Low-Frequency Signal Detection and Simulation Based on the Principle of Stochastic Resonance
Authors: Zhao Wen Li , Yin Yuan Ping , Liu Jin
Published: September 2011

The principle of stochastic resonance in bistable system is introduced firstly. The medium-low-frequency periodic signal and multi-frequency harmonic signal (the large parameter signal) are common in mechanical failure, but it is difficult to achieve stochastic resonance in these signals detection. The signal modulation characteristic is used in this paper to transform the various frequency components into small parameter signals which satisfy the adiabatic approximation theory. On the basis of that, weak signal detection based on stochastic resonance theory is realized. Then a mixing circuit system based on stochastic resonance is designed, the circuit first makes a frequency selection processing with a mixer on the mixed signal between the measurable signal and a scanning signal, and then it is input to the nonlinear bistable system to realize signal detection based on stochastic resonance. At last, the MATLAB simulation result shows that the circuit can realize the stochastic resonance and detection of weak periodic signal in medium-low frequency from noise background.
An Improved Method for Vietnam License Plate Location based on Mathematic Morphology and Measuring Properties of Image Regions
Authors: Mai Vinh Du , Miao Duo Qian , Wang Rui Zhi
Published: September 2011

In the Automatic License Plate Recognition (ALPR) system, the License Plate Location (LPL) is the key step before the final recognition. This paper proposed an improved LPL algorithm for Vietnam vehicle license plates (LP). The proposed algorithm consists of three main modules: Pre-processing (convert RGB image to grayscale image, adjust grayscale image intensity, image binarization use Otsu method), LP candidates location (morphology opening to remove noises & dilation operation, measure properties of image regions to find candidates), LP exactly location (finding the LP angle & rotating LP, cut exactly LP region). We implemented test for 350 Vietnam vehicle images, which obtained from the actual system, the average rate of accuracy of our method is 98.64%, our results are more exactly presented methods.
Research on Processing of Signals and Images of Critical Heat Flux in Natural Circulation Based on Wavelet Transform and Edge Detection
Authors: Sheng Cheng , Zhou Tao , Hong De Xun
Published: September 2011

Based on the experimental data acquired from natural circulation experiment, critical heat flux (CHF) was detected through applying Fourier transform and wavelet transform firstly. Then, the technology of edge detection was applied in detecting CHF regions under different heating powers from the photos which were taken in experiment. Results showed that wavelet transform could detect the occurrence of CHF much more accurate than Fourier transform. The apply of wavelet transform using of db1 wavelet and edge detection technology using of Canny algorithm could accurately distinguish the singularity of CHF in one-dimensional temperature signal and dry patch regions that represented CHF phenomena in two-dimensional photographs respectively, which can provide a new approach in the analysis of CHF experimental studies of natural circulation.
Study on Soil Landslide by Optical Metrology
Authors: Liu Wen Wen , Du Yun Hai , Wang Zhi
Published: September 2011

A new optical metrology method for measuring soil landslide displacement is presented in this paper. Under the optical experimental system, the soil micro-displacement field can be measured by obtaining the digital images of the soil specimen under water load and searching the gray value in sub-pixels by digital image surface fitting technology. The results show that through the optical system, this nondestructive testing method can improve the measurement accuracy, and has a very good prospect of application in the study of soil landslide. The experimentation can provide useful data for disaster prevention and mitigation research and actual construction. In addition, if using a CCD with higher resolution and more effective record area, or using synthetic aperture technology to increase effective record area, the accuracy of the experiment are expected to be further enhanced.
Modal Analysis of Boring and Milling Machine
Authors: Shang Jian Dong , Guo Jun Qi , Hu Dong Fang
Published: September 2011

The vibration is a high-precision machine tool components in the design of the major issues, facing its precision has a great influence, so column parts of its modal analysis is necessary. Creating three-dimensional finite element model of the column, using finite element analysis software ANSYS modal analysis of the column, which can reached the first five natural frequencies and mode shapes. Column Part of our understanding of dynamic performance and improve the machining accuracy is helpful. Modal analysis method is the dynamic performance of the column on the main approach, which mainly is to determine the vibration characteristics of the column that is the natural frequency and vibration mode, which we can determine the modes of processing accuracy, and thus the relevant parts of the machine column can be optimized so that it meet the requirements.
Signal Analysis of Impact Test Due to Tidal Bore Using Empirical Mode Decomposition (EMD)
Authors: Pan Dong Zi , Han Hai Qian , Li Ying
Published: September 2011

Tidal bore is a series of waves propagating upstream as the tidal flow turns to rising. The Qiantang Bore has aroused the curiosity of scientists and tourists all over the world in the past centuries as a strong turbulent bore. We consider here tidal bore impact measurements, recorded in the Qiantang River using pressure transducers. Based on the empirical mode decomposition (EMD) algorithm, a signal processing method for impact test due to the Qiantang Bore is proposed. As a self-adaptive approach, EMD method can be used to decompose the local characteristics of the no-stationary and nonlinear signals into several fluctuations and trend items with different time scales step by step. The separation of the quasi-static and dynamic pressures is conducted by using the empirical mode decomposition method.
RC Snubber Circuit of Large Gap Magnetic Driven System
Authors: Liu Yun Long , Tan Jian Ping , Xu Yan
Published: September 2011

Based on the single chip microcomputer (SCM) control theory, the control circuit of magnetic driving system of axial flow blood pump is designed. For the easy damage of TIP 122, which is used as the power switch of control circuit, RC snubber circuit is designed by analysis and experiments. And then an optimal matching of the key parameters is obtained to solve the security problem of the TIP 122. The experimental results show that the RC snubber circuit can improve the reliability and stability of the driving system, and to provide an experimental foundation for the further studies.
Roof Structural Program of Main Plant for GuanDi Hydropower Station
Authors: Wang Xiao Ping , Yu Li , Lu Bo
Published: September 2011

Concrete beam and slab system is commonly applied in the main plant roof of hydropower station, which is difficult for construction and slow, having a great impact on the construction period. For the main plant roof structure (span of 30 metres)of GuanDi hydropower station in Yalong River, this paper proposes three light steel roof systems, which are arched corrugated steel roof, light gauge-steel and shell roof, and carries detailed analyses and comparisons on the force calculation, appearance, the amount of steel, site construction, anticorrosive performance and other aspects. Regarded that the light gauge-steel roof is the most suitable system for the main plant roof of hydropower station, this paper introduces the layout, arched truss design and purlin of light gauge-steel roof, providing reference for design and application of similar projects.
Ground Motion of Non-Circular Alluvial Valley for Incident Plane SH-Wave
Authors: Qi Hui , Zhang Gen Chang , Nan Jing Fu
Published: September 2011

The seismic ground motions are studied in an infinite half-space with a non-circular alluvial valley under time harmonic incident anti-plane shear waves. Based on the conformal mapping method and Fourier series expansions, the conditions of displacement continuity and stress equilibrium at the interface of alluvial valley are set as semi-circular alluvial valley in conformal plane, then the result is obtained by constructing a set of infinite linear algebraic equations with boundary discretization. The unknown coefficients in the algebraic system can be easily determined. The present method is treated as a semi-analytical solution since error only attributes to the truncation of Fourier series. Earthquake analysis for the site response of alluvial valley or canyon subject to the incident SH-wave is the main concern. Numerical examples for semi-elliptic alluvial valley are given to test our program. The research indicates that great interaction exists between the alluvial valley and the horizontal surface, which will bring on great influence on ground motion. Therefore enough importance must be attached to the existing of subsurface cavity while finishing seismic design.
Classification Inversion Algorithm of Circular Cylinder Particle Size Distribution Based on the Light Extinction Date
Authors: Tang Hong , Zheng Wen Bin
Published: September 2011

Particulate flow is commonly encountered in industries as well as in many other chemical and mechanical engineering applications. The accurate measurement of particle size distribution is of the utmost importance since it decides the physical and chemical characteristic of the particles. The light extinction method can be used for in-line monitoring of particle systems thus providing real time measurements of both particle size distribution and particle concentration. In light extinction particle sizing, a classification inversion algorithm is proposed for the circular cylinder particles. The measured circular cylinder particle system is inversed with different particle distribution functions and classified according to the inversion errors in the dependent model. The simulation experiments illustrate that it is feasible to use the inversion errors of object functions to inverse the circular cylinder particle size distribution in the light extinction particle sizing technique. This classing inversion algorithm can avoid the defects that the type of the size distribution must be assumed beforehand for the light extinction method.
Study of the Manufacture about Single, Three-Phase Nanogenerator under Micro Vibration and their Performance
Authors: Sheng Jian Guo , Zhang Can Can , Zeng Ping
Published: September 2011

With the development of science and technology, the smaller generator was got more and more attention for people. In this article, through manufacture of single-phase and three-phase micro vibrations nanogenerator, the working principle of single and three-phase micro vibrations nanogenerator are introduced, and their performances are studied. Results show that, the pulse micro vibrations energy can be changed into rotating kinetic energy, then it can cause the rotation of the coil which produces electrical energy by cutting magnetic line. Energy conversion rate is exceed 80% for nanogenerator. Now, we can produce single, three-phase micro vibrations nanogenerator using the existing nanometer material. The power of three-phase micro vibrations nanogenerator is higher about 50% than the single one, it’s power factor is also slightly higher than that of single-phase. It indicates that three-phase micro vibration nanogenerator is better than single one.
Research on a Pneumatic Miniature Robotic Control System Based on Improved Single Neural Network PID Control
Authors: Li Wen , Dai Xiang Yu
Published: September 2011

Pneumatic miniature robotic control system usually adopts PID (Proportion Integration Differentiation) control strategy at present. To cope with the limitations of the basic PID control strategy, an improved single neural network PID control strategy is put forward in this paper. The control strategy is a single neuron adaptive controller with adjusting weighting coefficient, the weighting coefficient is realized according to the Hebb learning rule with supervisory. Both simulation and experimental results indicate that steady state error of the system equal to zero in the step-response curve, this scheme is a feasible control method for the 3-dof pneumatic miniature robotic control system.
The Development of a New Electromagnetic Field Generator for Anti-Scaling
Authors: Jiang Wen Bin , Li Qing , Li Xiong
Published: September 2011

Scaling exists commonly and its harm is huge. Because of this, design an amplitude-modulating electromagnetic field generator. The drive signal is obtained by amplitude modulation and power amplification. Generate two sine signals by the wien bridge and make the two signals through the MC1496 multiplier, the carrier’s amplitude changes with the modulator’s rule. And the frequency of carrier and modulator could be changed with the adjustment of the Oscillation resistance. Then, make use of D class amplifier TDA8920BTH to enlarge the power of modulated signal. At last, load the drive signal on a ferrite of magnetic coil to gain an electromagnetic field whose strength is modulated. Differ from the ordinary form of winding pipe with wire line, this design is making the magnetic coil close to a pipe. That’s more convenient for installing and removing. Of course, the concrete effect of descaling is needed to test by further experiments.
Optimization of RMC Trucks Dispatch Plan Based on Genetic Algorithms and SMS Technique
Authors: Wang Li Xin , Zhou Jun , Wang Yan
Published: September 2011

How to make the dispatch plan of (Ready-mix concrete) RMC trucks more effective and more efficient is an important issue for the RMC companies. Up to now, only a few researches have been done to solve this problem and almost none of them consider the situation of several RMC plants supplying several job sites. This paper presents a new model, which uses Genetic Algorithms (GAs) to optimize the dispatch plan for several RMC plants supplying several job sites, and use Short Message Service (SMS) technique to monitor the process of going on or to deal with something emergency.
Influences of Thermal Loads on Nonlinear Response of Thin-Walled Structures in Thermo-Acoustic Environment
Authors: Sha Yun Dong , Gao Zhi Jun , Xu Fei
Published: September 2011

Thin-walled structures of future hypersonic flight vehicles will encounter complex loadings and exhibit obvious nonlinear responses. The thermal loads from high speed flow or engine jet flow can cause thermal buckling of thin-walled structures, such as Thermal Protection System (TPS). If the structures are loaded with intense acoustic loads simultaneously, large deflection nonlinear response, including snap-through, can be induced. Snap-through will give rise to large amplitude stress cycles and non-zero mean stress, which can lessen the fatigue life markedly. Starting from Hooker’s Law with thermal components, the large deflection governing equations of motion for simply-supported plate under thermo-acoustic loadings are derived. The partial differential equation (PDE) of motion which is difficult to solve is then transformed with Galerkin’s method to the system of ordinary differential equations (ODE) under modal coordinates. The displacement responses under different combinations of temperature increments and sound pressure levels are calculated by employing Runge-Kutta method. Typical thermo-acoustic responses are predicted: 1) random vibration around pre-buckled equilibrium position, 2) persistent snap-through between post-buckled positions, 3) intermittent snap-through, 4) vibration around one of the two post-buckled positions. By dividing the restoring force term in the equation into linear term and nonlinear one, the evolutions of each term are obtained to illustrate the mechanism of thermo-acoustic response and the contributions of each force, including shear force, thermal force and membrane force. Thus a further insight into thermo-acoustic response has been achieved.
Comparison of Two Correction Methods for Predicting the Longitudinal Motion of the Hybrid Monohull
Authors: Wang Xu Jie , Sun Shu Zheng , Li Ji De
Published: September 2011

Using traditional strip method to predict longitudinal motion of hybrid monohull, the results are very different from test results, it can not reflect the effect of built-up appendage by reason of ignoring viscous force. This paper calculated the hydrodynamic coefficients of the hybrid monohull with two correction methods, one considering the viscous effect with lateral flow theory, the other calculating the correction coefficients based on RANS equation by using FLUENT software, and then predicted the longitudinal motion by STF method. By comparing the predicted results with the model test results, it shows that, both of two correction methods can reflect the effect of built-up appendage, and can be used for predicting the longitudinal motion of hybrid monohull, the accuracy of the latter is obviously better than former, it has good value in engineering application.
FPGA-Based Intelligent Software Hardening Chip for Computer Numerical Control System
Authors: Wang Mu Lan , Zuo Jian Min , Liu Kun , Zhu Xing Hua
Published: September 2011

In order to meet the development demands for high-speed and high-precision of Computer Numerical Control (CNC) machine tools, the equipped CNC systems begin to employ the technical route of software hardening. Making full use of the advanced performance of Large Scale Integrated Circuits (LSIC), this paper puts forward using Field Programmable Gates Array (FPGA) for the functional modules of CNC system, which is called Intelligent Software Hardening Chip (ISHC). The CNC system architecture with high performance is constructed based on the open system thought and ISHCs. The corresponding programs can be designed with Very high speed integrate circuit Hardware Description Language (VHDL) and downloaded into the FPGA. These hardening modules, including the arithmetic module, contour interpolation module, position control module and so on, demonstrate that the proposed schemes are reasonable and feasibility.
Comparison of Two Grey Models Applied in Predicting Numbers of Candidates for College Entrance Examination
Authors: Li Gang , Fang Ying , Tong Ya La
Published: September 2011

This paper mainly used two different grey models to predict the numbers of candidates of applying for the college entrance examination. We firstly introduced the conception of GM (1,1,D) and GM (1,1,C), briefly explained the difference between them from the aspect of theory, and then put them into the application of predicting the situation of variance of candidates for college entrance examination. Finally, we analyzed the reasons for this change and countermeasures. Compared to the application of numbers of candidates for college entrance examination by using two grey prediction models, this paper gives an effective method of data analysis, and provides technical information for the relevant decision-making departments. This paper set a good example for the application of selecting the correct grey model to address specific problems.朗读
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Rock Bolting Numerical Simulation Research and Application of the Face Breakthough
Authors: Xu You Lin , Zhang Hui , Zheng Wei
Published: September 2011

This paper analyzes the importance of rock bolting in coal mining, and the difficult of using rock bolting in breakthough with the affect of mining, adopt hydraulic fracturing and coal-rock mass strength test methods to test the seam stress and rock strength. Make the numerical simulation of break though bolting solutions in coal mine roadway by using FLAC3D software, simulate the different distributions of pre-stressed in coal-rock with three situations, the same raw distance but different space, the same space but different raw distance, impose different preload on the roof anchor in the rock bolting of mine roadway breakthough. Then determine a reasonable bolting solution of coal mine roadway according to the case of prestressed in coal-rock.
Design of the Floating Selecting Machine
Authors: Lu Chun Hui
Published: September 2011

As the water flowing through a reservoir, the floating probably stays in somewhere. Sometimes the floating can be breathed into the mouth of power engine and may do harm to the engine. Most time it will populate the water. So the floating must be selected in time. This machine can be fixed on the bank, grab floating and move along with tracks to grab in larger area. It can work efficiency, grab the floating in some dangerous area ahead the dam. The design is combined the structure of arm crane and the caterpillar tread crane, and loads analysis is according to the worst condition. All calculation results passed the stability check.
Durability Analysis on Hydraulic Suspension System of Modular Assembled Trailer
Authors: Vu Tuan Dat , Dong Da Wei , Yan Bing , Hua Chun Rong , Tu Qi Yang
Published: September 2011

The hydraulic suspension system is an important system of modular assembled trailer, which is used to turn trailer, control chassis frame height and make trailer comfortable. Therefore, the parts durability of suspension system has been required for service life and safety starting in design. Durability analysis on the parts of hydraulic suspension system is performed in this paper, including linear static analysis and fatigue life analysis. The vibration characteristics of finite element model are determined, which is verified by vibration measuring experiment. The fatigue life of suspension system parts is calculated by stress-life method with the effects of the road roughness and trailer speeds are considered.
Enhancement Measures of 35.6m Span Arched Corrugated Steel Roof
Authors: Wang Xiao Ping , Liu Min , Yang Ge , Li Zhen Xing
Published: September 2011

Arched Corrugated Steel Roof (ACSR) is a kind of thin-shell steel structure. Although it has many advantages, the characteristics of little span and low carrying capacity make such structure a very narrow range. This paper take an example with an arched corrugated steel roof of the 35.6 m span constructed with traditional way but the bearing capacity can't meet the design requirements, puts forward two enhanced measures, namely design the arch into fixed end support or set concrete cantilever beam to reduce arch span, then respectively analyze the two enhanced measures with finite element analysis software ABAQUS and ACSR software, finally get the maximum stress ratio and displacement of the structure, and consider setting concrete cantilever beam as the most appropriate measure to the project. The result of this paper provided beneficial reference for the application of the same type structures.
Analysis of Cogging Torque of PM Motor with Radial Magnetic Field and Parallel Magnetic Field
Authors: Lian Jun Qiang , Xie Shun Yi , Wang Jian
Published: September 2011

This paper provide two methods to analyze the cogging torque of PM motor with radial magnetic field and parallel magnetic field, FEM method and Analytic method. The FEM model and Analytic model of PM motor with radial magnetic field and parallel magnetic field are founded. We analyze the model in both methods. From the result of analysis. The air-gap magnetic density of PM motor can be analyzed. We can find the cogging torque of radial magnetic field PM motor is much heavily than the cogging torque of parallel magnetic field PM motor. The result of Analytic method is close to the result of FEM method. The Analytic method is useful in analyze the cogging torque of PM motor.
Exponential Stability of Stochastic Reaction-Diffusion Neural Networks with Mixed Delays in Procurement of Maintenance Material
Authors: Chen Xiao
Published: September 2011

In order to effectively improve the equipment maintenance material procurement management efficiency, improve economic efficiency of using the procurement funds, strengthen mathematical theory applications in the area of procurement, the neural network used in evaluation of organizational change is one of the most effective means. In this paper, a class of stochastic Cohen–Grossberg neural networks with reaction-diffusion terms, discrete time delay and distributed time delay is investigated. First, we describe the modeling, illuminate the significance of the system and introduce some preliminary definitions and lemmas which will be employed throughout the paper. Then, by using the Lyapunov functional method, M-matrix properties, nonnegative semimartingale convergence theorem and some inequality technique, sufficient conditions are obtained to guarantee the exponential stability of the system.
An Equivalent Method to Evaluate the Vibration Control Effect due to Blocking Mass Added to Complicated Structures
Authors: Wang Lu Cai , Zhou Qi Dou , Guo Ri Xiu , Xie Jian Bo
Published: September 2011

The vibration control effect due to blocking mass on vibration transmission of single force excited structure is analyzed by adopting mechanical impedance method. Take the ring ribs cylindrical shell as research object, and simplify it as a mass-spring-damping system. The mechanical impedance of the whole structure is calculated by general commercial software MSC/NASTRAN, and then the vibration control effective and ineffective frequency band of any given mass was discussed. By comparing the vibration control effect calculated by general commercial software (finite element method) and mechanical impedance method, it is proved that mechanical impedance method is effective in analyzing the vibration control effect due to blocking mass.
Frequency–Amplitude Relationship of Coupled Anharmonic Oscillators
Authors: Li Zheng Biao , Zhu Wei Hong
Published: September 2011

The frequency–amplitude relationship of coupled anharmonic oscillators is an important problem. Many powerful methods for solving this problem have been proposed. He’s parameter-expanding method is an important one. It holds the advantages of modified Lindstedt–Poincare parameter method and bookkeeping parameter method. The first iteration is enough. It is very effective and convenient and quite accurate to both linear and nonlinear problems. In this paper, He’s parameter-expanding method is applied to coupled anharmonic oscillators. The frequency-amplitude relationship and the first-order approximate solution of the oscillators are obtained respectively. The solution procedure shows that the method is very powerful and convenient to nonlinear oscillator. This method has great potential and can be applied to other types of nonlinear oscillator problems.
Single-Negative Properties Based on the Bandgaps of One-Dimensional Phononic Crystal
Authors: Xu Wei Kai , Wang Wei
Published: September 2011

Phononic Crystals (PCs) have important potential application in engineering by the properties of bandgaps. In the paper, the bandgap characteristic of one-dimensional PCs is attributed to the results of Single-Negative (SN) properties, e.g. negative modulus or negative density. The effective parameters of the 1D PCs were predicted by the equivalent layer concept with considering viscous damping, and the results showed that during the frequency regions of the bandgaps, the negative parameters appeared. This will be a reference for the design of acoustic negative refraction metamaterials.