bluuebunny/crossref_metadata_2025 huggingface dataset:
Laboratory Study on the Effect of Asphalt Emulsion as a Rejuvenator in Aged Asphalt Pavement
Authors: Tanzadeh Rashid , Arabani Mahyar
Published: November 2012

Modiﬁcation of the asphalt binder is one approach taken to improve aged pavement performance. To make the most of maintenance budgets, many agencies have resorted to the use of asphalt rejuvenators as an alternative to revive aging and brittle asphalt pavements. The purpose of this study is laboratory research on the effect of asphalt emulsion in restoring the original properties of aged asphalt pavement. For this purpose, the repeated load axial test is carried out on conventional asphalt samples and aged asphalt samples containing rejuvenator agents in different stress and rejuvenator percentage. Bitumen aged with RTFO according to ASTM-D2872 and the optimum bitumen of 5.5% were considered. The softening point and penetration tests, to examine the effect of rejuvenator in asphalt mixtures modification, On the basic, aged and modified aged bitumen were performed. The results represent that asphalt emulsion as a rejuvenator material in aged asphalt samples because of suitable performance improve aged asphalt permanent deformation resistance and aged bitumen Rheological property.
Research on Hardware Design Verification Methods
Authors: Zhang Jie , Qi Jian , Guan Yong
Published: November 2012

This paper first summarizes the existing basic theories and methods of hardware design verification. Then it analyzes and compares the simulation-based verification and formal methods-based verification, and discusses Equivalence Checking, Model Checking and Theorem Proving in detail. Finally, it points out the existing problems and the future directions in the field.
Numerical Simulation of Cutting Process by Cutter in Shield Machine
Authors: Zhang Yu , Sun Rui
Published: November 2012

Shield cutterhead is the key part of tunneling construction machinery. Because the cutterhead can cut the front soil by the cutter on the cutterhead, it’s of great significance for the design of the cutterhead to research the dynamic process of cutter cutting. With using extended Drucker-Prager constitutive model and damage model which has element removing function, the properties of soil material can be simulated more practically. The results also provide a simulation method of soil material on researching cutterhead tunneling process. Combined with finite element dynamic contact characteristics, it is obtained the regulation of cutting force changing with time and cutting force value in the process of cutter cutting. The results also offer a engineering parameters for researching the load state of cutterhead tunneling.
Speech Recognition for Endoscopic Automatic Positioning System
Authors: Ma Ning , Chen Xiao Dong , Li Ya Nan , Yin Qing Yun , Wang Yi , Yu Dao Yin
Published: November 2012

A novel system for minimally invasive surgery is presented in this paper. The system utilized an Endoscopic Automatic Positioner (EAP) controlled by Speech Recognition Engine to implement the clamping and dynamically positioning of the laparoscope. The motion instructions of the EAP are transformed from voice commands of specific doctor recognized by an improved algorithm named Normalized Average- Dynamic Time Warping (NA-DTW). An embedded platform based on ARM is designed to run the NA-DTW on Windows CE operating system. 1250 groups of experiments from 10 individual speakers demonstrate the performance of DTW. Compared with traditional algorithms, the enhanced algorithm improves the recognition rate from 96.6% to 99.76% and shortens the time of calculation by 51%. The results demonstrate the enhanced algorithm being effective and can satisfy the real time requirement in embedded system.
Application of Mixed Boundary Condition to Wave Equation Forward Modeling in 2.5D VTI Medium
Authors: Li Gui Hua , Feng Jian Guo , Lin Nian Tian , Li Gui Liang , Guo Min
Published: November 2012

A key issue in the wave equation simulation of seismic records is the boundary conditions. Due to computer memory and computation and other restrictions, can only be solved on a limited area, which will cause the introduction of an artificial reflector. So as to simulation of seismic wave propagation in an infinite medium, the boundary conditions must be constructed so that the interface of the reflection as little as possible. In 2.5D VTI media feature analysis absorbing boundary of higher order velocity-stress staggered-grid finite difference method are established. The mixed boundary of the feature analysis absorbing boundary plus damping attenuation condition is used in 2.5 D VTI numerical simulations, simulation results show that this method is an efficient absorption and attenuation boundary conditions.
Study on Torque Measurement Errors’ Compensation of Reducer Based on Piecewise PID Control
Authors: Li Kai , Yuan Feng , Guo Xin
Published: November 2012

Reducer’s input torque and output torque characteristics determine the kinematics performances of electro actuators. During the torque measurement experiment, many factors lead to torque measurement error, the major error components of which are mechanical assembly’s precision and electrical machine’s driven features. Compensating electrical errors and obtaining the real mechanical characteristics are meaningful and necessary especially on the conditions of wide-scale torque measuring. Neglecting mechanical factors’ influences, this paper pays attention to system’s control features based on the actual project with the demands of steady state and dynamic torque loading. Considering the quantized error, the mathematical model of power driven system is established, and the appropriate control algorithm of piecewise PID method is proposed, the simulation curves of which are expressed. The actual measuring experiment curves of rotating angle and compensated torque are drawn, the results of which illustrate the torque measuring error induced by drivers has been obviously removed, which validates the efficiency of such method.
The Forecasting of the Elevator Traffic Flow Time Series Based on ARIMA and GP
Authors: Li Jun Fang , Zong Qun
Published: November 2012

As one of the conventional statistical methods, the autoregressive integrated moving average (ARIMA) model has been one of the most widely used linear models in time series forecasting. However, the ARIMA model cannot easily capture the nonlinear patterns. Artificial neural network (ANN) can be utilized to construct more accurate forecasting model than ARIMA for nonlinear time series, but it is difficult to explain the meaning of the hidden layers of ANN and it does not produce a mathematical equation. In this study, by combining ARIMA with genetic programming (GP), a hybrid forecasting model will be used for elevator traffic flow time series which can improve the accuracy both the GP and the ARIMA forecasting models separately. At last, simulations are adopted to demonstrate the advantages of the proposed ARIMA-GP forecasting model.
Design on Real-Time Control System of Lower Limb Exoskeleton Robot Based on Optical Fiber
Authors: Meng Liang , Zhang Xiao Dong , Li Kai Yang
Published: November 2012

In the exoskeleton robot motion capture system, the sensor characteristics not only should be small in size, light in weight, low power consumption, but also requires easy to wear, reliable real-time. In this article, an exoskeleton robot real-time control system is designed based on the existing fiber-optic sensor. The experimental data is analyzed by hidden Markov model. The system can distinguish between the human bodies six sports: rest, walk, run, squat, stand , on the slope, and it can realize the real-time control on the exoskeleton robot.
PID Parameter Setting Based on Fuzzy Control Algorithm and its Application in the Temperature Control System of Airplane
Authors: Ding Fang , Ma Tao
Published: November 2012

This Temperature control system of aircraft cabin is a complex system with nonlinear, time-varying, model inaccurate and work environment uncertain. According to the system control requirements, the fuzzy controller with the characteristic of fast response speed, good stability and strong resistance to interference is used in the study. The system error is adjusted constantly by using fuzzy control algorithm and simulation study is conducted in the software Matlab. The results are showed that control effect of control method used in this study is better than the traditional PID control method, and dynamic performance, steady state accuracy and robustness of system is effectively improved.
Fractal Theory Method’s Research of the Gear Fault Diagnosis
Authors: Wang Chun , Jiang De Ping , Wang Jiu Hua
Published: November 2012

This paper connects the fractal theory with the mechanical fault diagnosis，discusses the basic concept of the fractal dimension，and makes the technique of the phase space reconstruction for deriving the correlation dimension. Research result indicates that the correlation dimension in fractal geometry can efficiently reflect the shock signal component that excited by fault in gear’s vibration signal, and describe the development state of gear’s fault. Therefore, it’s sensitive to initial fault type of complicated mechanical system by using correlation dimensions in fractal theory to analyze.
Static Stiffness Analysis and Modal Analysis of Horizontal Milling & Turning Machining Center
Authors: Cai Wei , Miao Zhuang
Published: November 2012

In order to in-depth study the weak part of the turning operation of the turning and milling machining centers during the work process, the three-dimensional structure model is established, and the static stiffness analysis and modal analysis are carried out. The deformation of each main part is grasped, which can determine the main deformation component. All above will provide the theoretical basis for future improvement of the machining centers.
Study on Networking and Intelligent Fault Diagnosis System for Large-Scale Rotating Machinery
Authors: Liu Jie , Hu Fang Xia
Published: November 2012

A networking and intelligent online monitoring and fault diagnosis system for large-scale rotating machinery is developed according to requirements of an iron & steel enterprise. On the aspect of networking, a mixed structure of C/S and B/S is adopted, and the system integrates local online monitoring and diagnosis, remote monitoring and diagnosis, and remote diagnosis center. On the aspect of intelligent diagnosis, a multi-symptom comprehensive parallel diagnosis technology is adopted based on expert system, neural network and fuzzy logic. Finally, main functional modules and its realization are introduced. Application shows that the system runs normally, and the expected objective is achieved.
Experimental Study of the Temperature Field Equation in the Leeward Tunnel during Mine Fire Period
Authors: Wang Wen Cai , Jiang Yu Hong , Hou Tao , Liu Wei , Lu Yang , Zhang Bo
Published: November 2012

According to the principle of heat transfer, the temperature field equation in the leeward tunnel was set up and the experimental device with a ratio of 1:20 was built. When it happened to fire in roadway, the correctness of the temperature field equation can be verified by the experiment. In experiments, the armored thermocouple and color paperless recorder were used to record the temperature of each measuring point. The S-3-300 pitot tube and YJB-2500 compensation micro-manometer were used to determine the wind speed. When the mine roadway fired, the experiment determined the temperature field equation experiment coefficient of Kc. It showed that in the developing phase of the fire Kc= 15 ~ 20, in the stable phase of the fire Kc= 10 ~ 15, in the failing phase of the fire Kc= 20 ~ 25.
Thermal Analysis Study on Packaging Materials of Power-LED
Authors: Liu Yi Bing
Published: November 2012

In this paper, a high power- LED package model has been built. Different bonding materials and substrate materials have been chosen. Having performed simulations of the temperature field by ANSYS finite element software, the conclusions are drawn as follows: nanometer silver paste has the best heat transfer characteristics; ALN is an ideal substrate material because of its lowest junction temperature, thermal resistance and the maximum heat load when the junction temperature reaches120 ° C .
Analysis of Multi-Crack Growth in Asphalt Pavement Based on Extended Finite Element Method
Authors: Sima Yu Zhou , Wang Fu Zhou
Published: November 2012

An extended finite element method (XFEM) for multiple crack growth in asphalt pavement is described. A discontinuous function and the two-dimensional asymptotic crack-tip displacement fields are added to the finite element approximation to account for the crack using the notion of partition of unity. This enables the domain to be modeled by finite element with no explicit meshing of the crack surfaces. Computational geometry issues associated with the representation of the crack and the enrichment of the finite element approximation are discussed. Finally, the propagation path of the cracks in asphalt pavement under different load conditions is presented.
Application of Crosswell Seismic Technology in the Fine Reservoir Description
Authors: Li Gui Hua , Feng Jian Guo , Zhao Shu Hong , Li Gui Liang , Zhang Wen Bo
Published: November 2012

According to the instance of crosswell seismic in the district of daqing oil, this paper introduces crosswell seismic data acquisition, the processed results, the application of the parameter inversion and geological interpretation in fine reservoir description. Through these examples, this paper also discusses the crosswell seismic technology development status and further development trend.
Development of CEM in Relation to Subsurface Electromagnetic Scattering
Authors: Amna Ajaz , Xu Jia Dong , Mueed Abdul
Published: November 2012

Computational Electromagnetic (CEM) techniques have become an indispensable tool in efficient EM modeling, analysis and design process. EM subsurface scattering is a broad field of research with varying degree of complexity. Due level of the obscurity involved in the subsurface scattering investigation, it is therefore considered imperative to explore this problem area of EM for better insight through CEM-based study and models. In this paper, frequency domain CEM techniques are studied which have been tested to provide solution for subsurface scattering problems in terrestrial environments. The development of CEM methods for comparatively more complex problems of scattering from embedded non-metallic inhomogeneity in lossy, rough and layered media remains the focus of this article. The objective here is to provide an overview of CEM development by selecting few examples from the wide area of subsurface EM scattering.
Numerical Investigation of Using 1-Butanol in a Port Fuel Injection Spark Ignition Engine
Authors: Qian Ye Jian , Chen Zhi Fang , Wang Chun Mei
Published: November 2012

A numerical study is conducted in a port fuel-injection, spark-ignition engine fuelled with 1-butanol at different fuel/air equivalence ratios and inlet air temperatures. The effect of fuel/air equivalence ratio and inlet air temperature on the engine performance and emission characteristics is analyzed. The modeling results show that the incylinder pressure and temperature increases with the increase of fuel/air equivalence ratio. The slightly lean mixtures offer the maximum level of NOX emissions. In addition, preheating the inlet air can increase the incylinder pressure peak value and NOX emissions.
On Hydraulic Brake System Using Bench Experiments for Off-Road Vehicles
Authors: Zhao Fang , Lin Mu Yi , Wang Zhun
Published: November 2012

The full power hydraulic brake system has several advantages over traditional brake actuation systems. These systems are capable of supplying fluid to a range of very small and large volume service brakes with actuation that is faster than air/hydraulic brake systems. Implementation of full power hydraulic brake system in off-road vehicles calls for good understanding of its dynamic characteristics. In this paper, we consider the problem of dynamic modeling of the brake system and develop a dynamic model for a hydraulic brake valve. First, the dynamic characteristics of full power hydraulic brake system are analyzed theoretically. The effects of varying design parameters (brake valve, accumulator and so on) and the different operating conditions are then analyzed. Second, we investigate the dynamic characteristics of a full power hydraulic brake system using a test bench, which is a loader brake system specifically designed for one construction Machinery Company. Finally, based on the experimental results, the mathematical models are amended and verified. The result shows that the model-calculated data agree well with tested data. The dynamic behavior of hydraulic valve can be well predicted with the model. The simplified models can be applied to the studies of full power hydraulic brake system dynamics.
A Friction Feedforward Compensation Method Based on Electromagnet Torque Feedback Compensation
Authors: Shi Ting Na , Liu Rui , Li Hong Feng
Published: November 2012

In this paper, a structure of friction feedforward compensation based on electromagnet torque feedback compensation is proposed to improve the speed performance of permanent magnet synchronous motor (PMSM), especially in a low speed range. First, this paper estimates the parameters associated with the friction model via an off-line identification method and compensates friction with the model. Then electromagnet torque feedback compensation is introduced to enhance the robustness of the system. The proposed control scheme is verified by computer simulation.
Design of Brushless Electric Excitation Synchronous Machine
Authors: Zhang Feng Ge , Jia Guang Long , Wang Xiu Ping
Published: November 2012

Brushless electric excitation synchronous machine is a new kind of AC machine. There are two sets of windings with different pole numbers on the stator. It eliminates the brushes and slip rings. The air gap magnetic density of brushless electric excitation synchronous machine is achieved based on Ansoft. And the influence of stator windings with different pole numbers on coupling capability is analyzed. All the results are investigated to provide the guide for the optimal design.
Fabrication Scaffold by Extrusion Freeforming from High Solid Loading Ceramic Paste
Authors: Chi Xiao Peng , Yang Shou Feng , Evans Julian R.G. , Lin Guo Liang
Published: November 2012

A method for fabrication of mineral materials was studied. Micro extrusion freeforming of ceramics from high solid loading ceramic paste has advantages of low shrinkage stress, high sinter density, and environmental friendliness. Hydroxyapatite and alumina lattices were directly fabricated using 80 microns to 500 microns filaments. We report here on the implementation of design and fabrication of these scaffolds for photonic band gap materials. Influence of the solid contents of paste in the process of extrusion freeforming was studied.
Adaptive Beam-Forming Based on the Mutative Scale Chaos Optimization
Authors: Zhang Zhi Wei , Wang Bo , Zhu Zhi Gang
Published: November 2012

In order to improve the SINR of the beam-former in the case of DOA mismatch, the paper raises the probability of constraint beam-forming algorithm based on mutative scale chaos optimization in connection with the worst performance of the best sound beam-forming algorithm. By introducing the probability constraints confidence interval and the signal vector error distribution law in the beam-forming, the constrained optimization problem is eventually turned into a nonlinear optimization problem. Then the global optimal weight is searched by the mutative scale chaos optimization method. Simulations have shown that the algorithm can significantly improve the SINR.
The Study of Local Wave Noise Reduction Based on the Correlation Analysis
Authors: Cui Bao Zhen , Wang Ze Bing , Pan Hong Xia
Published: November 2012

The signal can be divided into a number of intrinsic mode components (IMF) through local wave decomposition. The decomposition process is equivalent to the adaptive filter for signal. The frequencies of each IMF have reduced with the decomposition order. This paper established judgment criteria of signal, noise and pseudo component based on the local wave decomposition, used the characteristics of cross-correlation coefficient and autocorrelation sequence, combined with the power spectral density. The dominant mode function was extracted effectively and the final effects are used gear reducer in the JZQ250 of fault rolling bearing inner ring. It provides a new method for non-stationary signal adaptive noise reduction and fault diagnosis of rotating machinery.
From Simulation to FPGA Control Circuit Implementation for Wind Power with Battery Charging
Authors: Shieh Cheng Shion
Published: November 2012

While application of field-programmable gate array (FPGA) chip has been extensively investigated, the charging control is relatively unexplored. This paper proposes a flow chart of energy storage for wind power system with Lead-Acid battery whose charging control is constructed by Very High Speed Integrated Circuit Hardware Description Language (VHDL) code. This research focuses on the proposed digital control algorithm can be directly downloaded into field-programmable gate array (FPGA) chip after simulation finishing. This saves greatly time on hardware circuit design. A simulation is presented to illustrate the effectiveness of the proposed charging flow chart.
Application of a Pseudo-Fourier Series Method in Tilt Data Processing
Authors: Wu Ye , Wan Yong Ge , Li Ying Qiu
Published: November 2012

A new pseudo-Fourier series (PFS) method to suppress single-frequency noise is proposed in this paper. The basic principle is derived in detail. Numerical experiments show that the PFS method is highly effective in extracting harmonic signal and when the frequency of the extracted composition is very close to that of the noise composition, the filtering effect will be slightly decreased, and the close range is about 1e-4. Four types of ground tides are successfully filtered out for picking-up the long-term trend of the tilt observation and the mutational abnormality.
An Open-Loop Method of Controlling Narrow Band Channel Delay
Authors: Chang Chuan Wen , Mao Wen Shen
Published: November 2012

In the narrow band data communication system, there are such problems as long time delay and random loss of data resulted by large amount of data from data source. The delay of a typical data transmission system consisted by DTE and DCE is resulted by several factors. Through the analysis of these factors, this paper presents a low-cost and open-loop software method to control the speed of the signal source. By increasing the interface speed and reasonably estimating the data package delay, this method can make the delay and the loss of data package controllable and prevent the random loss of data. This method can be applied to those low-speed communication transmission situations which have special requirement of the delay, such as short wave, ultra short wave, dial-up network, a line for special use and so on.
Radar Emitter Signals Identification Based on Gray Relational Cluster Analysis
Authors: Wu Si Dong , Ming Zhu , Fu Ke Chang
Published: November 2012

To enhance accurate Deinterleaving and identification rate of radar emitter signals to meet the requirements of modern electronic warfare, a novel method for radar emitter signals identification recognition is presented in this work. Firstly, instantaneous frequencies of radar signals are analyzed. Then additional derived characteristics and the extraction algorithm is proposed, based on which the Gray relational cluster analysis method is used to cluster and identify the radar emitter signals. The proposed method is applied to simulated six kind of typical radar emitter signals with different SNR. Simulation results show that the proposed method can achieve high accurate recognition rate.
Design of Acceleration Sensor Simulation System Based on STM32
Authors: Qu Bo , Lin Hong
Published: November 2012

A method about the simulation system of automobile acceleration sensor basing on STM32 is introduced in this paper. This system can simulate acceleration sensor signal of the real car and make the status and values of acceleration sensor to be controlled by PC. Designing of the whole project, power on detection of the acceleration sensor and the Manchester Code used for information transferring between simulation system and airbag ECU are introduced in this paper. This design is used in the detection and diagnosis system of ABRS ECU to provide acceleration signal.
Measurement of Moment of Inertia Based on Torsion Pendulum
Authors: Zhao Yan , Zhang Xiao Lin , Wang Jun , Tang Wen Yan
Published: November 2012

The measurement system based on torsion pendulum is presented to measure the moment of inertia considering the effect of air damping. With the introduction of air-hovered turntable, the influence of friction force is reduced. In order to increase the effect of the air damping, damping paddles are used to increase the area of test object. The pendulum motion of test object can be measured by the displacement sensor. The moment of inertia of test objects can be calculated by the damping ratio and oscillation period. The experimental results show that the relative measurement error of the moment of inertia of the test objects is less than 2%.
A Suitability Evaluation Method Based on Fractal Dimension in Geomagnetism Matching Navigation
Authors: Liang Ying , Xu Qing Yang
Published: November 2012

The suitability evaluation has an important influence on suitable-matching region selection of geomagnetism matching navigation. Geomagnetic anomalies have a fractal characteristic. Fractal dimension can describe the self-similar characteristics and subtle changes of irregular, broken, uneven and infinite detail form of geomagnetic anomalies. A comprehensive evaluation function based on fractal characteristics was established, and the ranks of region suitability were gotten finally.
Study on Tent Cloth Materials for Desert Type Camouflage
Authors: Yu Jun , Hu Zhi Yi
Published: November 2012

In order to solve the problem of quickly fading on tent cloth material, this paper presents a new formulation of a four-color printing coating on inorganic pigment. As an actual application, the desert type camouflage coating is tested and completed. At the same time, this paper adopts a new method to design a digital camouflage based on the natural background. That is to extract main colors of background using clustering segmentation, as well as fill in the camouflage spots using mosaic blocks. The test demonstrates that, after the designed desert pattern is printed on the tent cloth, the tent made from the tent cloth is placed into the desert background. It can reach a good camouflage effect.
Multi-Pass Route Planning for Thick Plate of Low Alloy High Strength Steel by Double-Sided Double Arc Welding
Authors: Yang Cheng Dong , Huang H.Y. , Zhang H.J. , Chen Y.X. , Chen San Ben
Published: November 2012

Double-sided double arc welding (DSDAW), a high efficiency method for welding thick plate of low alloy high strength steel which does not require back chipping is used in this paper, research on multi-pass route planning for thick plate of low alloy high strength plate by double-sided double arc welding. Firstly, establish a double-sided double arc welding system that can realize thick plate of low alloy high strength steel double-sided double arc welding by double robots. Then, Propose the multi-pass route planning for thick plate of low alloy high strength steel by double-sided double arc welding by means of misplaced welding. According to the welding parameters and the geometry size of groove, plan the layers, the number of beads and the concrete position of the welding torch for each bead. Finally, the welding experiment has been done to verify the effectiveness of multi-pass route planning. The results of welding experiment are approximately agreement with the multi-pass route planning results. The backing weld can get better appearance in the front and guarantee fusion penetration in the back simultaneously. On the basis of the multi-pass welding route planning, good fusion and leveling interface can be obtained after filler passes.
Optimal Position for Thin-Walled Curved Surface Part in Array-Type Fixture
Authors: Zhang Hong Shuang , Li Xiang Guo , Niu Geng , Zheng Dong Yang , He Hui
Published: November 2012

An optimization on Thin-walled Curved Surface Part (TCSP) position is proposed in order to meet the increasing flexibility need of airplane, automobile industry etc. The position process comes down to coordinate transformation problem. A method based on Oriented Bounding Box (OBB) iteration for TCSP position in array-type fixture is proposed to solve parameters of part coordinate transformation matrix, and comparisons between OBB and OBB iteration is shown. The calculation example shows that the proposed method is feasible, and can effectively solve position parameters of the TCSP position process.
Study on Fatigue Life of Spring Bracket for Air Suspension System
Authors: Men Yu Zhuo , Yu Hai Bo , Pan Xin , Cheng Chao , Huo Na
Published: November 2012

In order to research the fatigue life characteristics of the pivotal load carrying structure equalizing beam of a heavy-duty truck, a fatigue damage simulation calculation method is presented based on the digital proving ground. The typical proving ground durability virtual digital pavement is built by the ADAMS, with the simulation and pavement test should obtain the dynamic load of the equalizing beam in the running state, LMSTecWare software is used to calculate fatigue damage of the pivotal load carrying structure. The contrast results of simulation and test indicate that the simulation results of the cumulative fatigue damage of the equalizing beam coincide with the pavement test very wel1, and the method can be use to carry out the fatigue life simulation and the fatigue life prediction of the pivotal structure of the heavy-duty truck, and reduce the new product development period and reduce the development cost.
Design of Position Monitoring System
Authors: Chen Zi Ran , Zheng Fang Yan , Zhen Yong , Xie Qi He
Published: November 2012

To rescue trapped workers and reduce death rate in mine tragedies, a novel position monitoring system for mine workers is proposed. This monitoring system adopts wireless communication technology avoiding the influence of temperature instability, poor light and humidity. A C51 chip and a single chip radio transceiver nRF2401 are consist of a position monitoring system to enhance its security and lessen its loss.
The Design of DSP Screen of High Precision Size Inspection
Authors: Zhang Jian Li , Zheng Hua Dong
Published: November 2012

According to the actual iron production in Shougang, four devices of Material particle size detection system are designed. The structure and principle of equipment and the design of control system are introduced in this paper. The results of Physical testing and factory commissioning show that the control procedures are safe and reliable. The smooth production can be ensured. All the parameters can meet the production requirements.
Study on Macroscopic Prediction Model of Traffic Accident Influence Factors
Authors: Men Yu Zhuo , Yu Hai Bo , Pan Xin
Published: November 2012

In order to study the main influence factors on urban traffic accident, the grey correlation system macroscopic prediction method was presented. Concerning the overall environmental perspective of people, automobile, and road as well as the distinctive characteristic of urban traffic accident, the prediction model of factors contributing to traffic accident was proposed. EXCEL software was applied to analyze the relations between the influence factors and traffic accidents with grey theory model adopted to calculate the correlation grade among different factors. The prediction Model was also validated through examples on the basis of the investigation of traffic accident and the relevant statistics. The results show that the model is applicable and efficient in forecasting the main factors and the relations between them, thus to avoid traffic accidents.
Study on the Mechanism of Optical Glass Sub-Surface Crack Formation in Single Abrasive Grinding
Authors: Chen Jiang , Zhang Fei Hu , Zhao Hang , Yong Zhang , Liu Li Fei
Published: November 2012

Removed due to plagiarism
Two-Dimensional Cell Trapping Using Single Axicon Fiber without Physical Contact
Authors: Taguchi Kozo
Published: November 2012

Chemically etched axicon fiber was proposed for two-dimensional cell trapping. We fabricated axicon micro lenses on a single-mode bare optical fiber by selective chemical etching technique. The laser beam from fiber axicon microlens was strongly focused and optical forces were sufficient to move a microorganisms and biological cells without physical contact. The apex angle of the chemically etched fiber axicon microlens was very important parameter for laser trapping. From these experimental results, it was found that our proposed method was a promising tool for the isolation of microorganisms.
Grinding of Super-Alloys Using Metal-Bonded CBN Wheel
Authors: Hasuda Yuichi , Handa Asahi , Kobori Yuki , Kinebuchi Shinichi , Furusawa Toshiaki , Harigaya Yasuo
Published: November 2012

Superalloys, used for turbine blades and jet engines for airplanes, have low heat conduction and high strength at elevated temperature. These properties make it very difficult to obtain effective grinding processes with high accuracy. Superalloys with fine performance under high temperature circumstances attract great attention to be used as the material for turbine blades. It has been expected to establish reliable efficient grinding of superalloys at the final grinding process. In this study, the influence of wheel wear, grinding ratio, and surface roughness, with the grinding process of superalloys, using metal bonded CBN wheel were carefully observed. Since superalloys have lower heat conduction and they cause a severe wheel wear, which leads to low grinding ratio. However, the high grinding ratio of about 800 and the stable figure of surface roughness of Rz=2μm were obtained when Co-base PWA647 and X45 were ground by using metal-bonded CBN wheel. Consequently, the Co-base superalloys perform rather well producing finer grinding process than the intensive Ni-base or Fe-base superalloys.
Development of the Hole Generation Technology for Aircraft CFRP Parts
Authors: Fukagawa Hitoshi , Hirogaki Toshiki , Kato Takao , Kato Atsushi , Seki Masako
Published: November 2012

Carbon fiber-reinforced plastics (CFRP), which are now used in some aerospace applications, is difficult to cut and drill holes in. Moreover, no reports have focused on selecting a suitable drilling method for each aerospace part. This paper discusses many methods of hole generation for CFRP composites, including methods using traditional drill tools and non-traditional methods such as abrasive water jet (AWJ), laser beam and abrasive blast. We look at traditional cemented carbide material tools, polycrystalline diamond (PCD) tools, diamond-like carbon (DLC) coated tools and ceramic tools. Then, comparing the experimental results of these methods from the viewpoints of characteristics, efficiency, cost, and hole quality, we investigate each problem to select the suitable drilling method. As a result, we propose a novel method to strategically obtain the best solutions to generate holes in aerospace parts.
Analysis of Discharge Current in Wire-EDM Considering Electromagnetic Fields in and between Electrodes
Authors: Hada Keita , Kunieda Masanori
Published: November 2012

In wire electrical discharge machining (WEDM), discharge current is one of the important factors which determine the machining properties, such as machining speed or machining accuracy. Previously developed machining simulators of WEDM, however, neglected the influence of workpiece conditions on the discharge current. Hence, this study developed a simulation tool for analyzing the discharge current in WEDM, where the electromagnetic field analysis around the wire electrode was coupled with the analysis of the equivalent circuit of the entire pulse generator circuit. The simulation results showed that, under the same pulse voltage and duration, the discharge current may change depending on the electromotive force which is determined by material properties, geometry and size of workpiece and wire electrode. In this study, the discharge current was calculated with different workpiece thicknesses. In addition, the discharge current was measured and compared with the calculation results in order to show the validity of the simulation tool.
Challenge to Development of Functional Multi-Wire EDM Slicing Method Using Wire Electrode with Track-Shaped Section
Authors: Okamoto Yasuhiro , Kimura Yasuaki , Okada Akira , Uno Yoshiyuki , Ohya Jun , Yamauchi Toshiyuki
Published: November 2012

Brittle materials, such as silicon, silicon carbide and sapphire have been conventionally sliced for wafers by a multi-wire saw method with slurry in industrial fields. Recently, the multi-wire saw method with a fixed diamond abrasive wire has been available as a commercial product at acceptable cost, and the high slicing performance is expected compared with the normal multi-wire saw method with slurry. However, there still remain some problems such as bad working environment with abrasives, cleaning cost of sliced wafers, crack generation on the sliced surface and a large kerf loss against a wafer thickness. On the other hand, the developed multi-wire EDM slicing method would accomplish the high performance slicing of silicon and silicon carbide with a narrow kerf width under a clean process environment. However, the thinner wire is challenging process with a normal round shape wire electrode. Therefore, the new wire electrode with track-shaped section was proposed in order to satisfy both the narrow kerf width and the high wire tension even in the case of thin wire electrode. In this study, the running control of wire electrode with a track-shaped section was experimentally investigated, and the possibility of proposed process was discussed.
Manhattan-World Assumption for As-Built Modeling Industrial Plant
Authors: Mizoguchi Tomohiro , Kuma Tomokazu , Kobayashi Yoshikazu , Shirai Kenji
Published: November 2012

As industrial plants such as chemical and power plants continue to age, their CAD models are increasingly required for model-based planning and simulation. However, in the case of old plants, the original CAD models rarely exist, and hand-drawings do not precisely match the present states of the plants due to repeated remodeling. It is therefore becoming a common approach to reconstruct CAD models from the point cloud of such plants captured by terrestrial laser scanning and use these models for the above purposes. Such a reconstruction process is usually called “as-built modeling”. However, existing methods for as-built modeling come with such problems as the need for many human operations and computational cost. In this paper, we propose an automatic and efficient method for as-built modeling industrial plants using Manhattan-world assumption which states that there exist three dominant axes orthogonal to each other in artificial buildings and the internal parts are arranged so that they are parallel or orthogonal to one of them. In the case of industrial plants, it is reasonable to consider that long pipes and shaped steels are arranged so that they follow this assumption. In addition, plant parts are supposed to be designed as long linear sweep surfaces on CAD system or hand drawings. Our method can automatically recognize such sweep parts and their cross sectional shape which follow the assumption, as well as efficiently recognize them even from a large point cloud which may contain as many as one hundred million points in a few minutes. We demonstrate the effectiveness of our proposed method from various experiments on real scanned data.
Measurement of Contact Stiffness for Stiffness Estimation of Machine Tool Supports
Authors: Kono Daisuke , Inagaki Takahiro , Matsubara Atsushi , Yamaji Iwao
Published: November 2012

The contact stiffness is measured at interfaces of several materials that are often used for the machine tool support. Models of machine tool supports and contact stiffness are described. Then, a measurement method of the contact stiffness is proposed according to the model and demonstrated. The unit normal contact stiffness is 1-2×106 N/mm/mm2 for general steel and cast iron. The unit normal contact stiffness is pSuperscript textositively correlated with the longitudinal elastic modulus. The unit tangential contact stiffness is 1/10-1/5 of the unit normal contact stiffness and not correlated with the elastic shear modulus. The surface roughness of the specimen should be small to reduce the dispersion of the measured unit contact stiffness.
Concept for Temperature Control in Broaching Nickel-Based Alloys
Authors: Klocke Fritz , Gierlings Sascha , Veselovac Drazen
Published: November 2012

In production of safety critical components in aero engine manufacture, to date broaching is the most efficient process machining fir-tree slots in turbine discs. Machining highly thermal resistant Nickel-based alloys, manufacturers commonly use High Speed Steel (HSS) tools and work at low cutting speeds in order to stay at rather low tool wear rates and avoid part quality defects. The key variable affecting tool wear as well as part quality, as in most machining processes, is the temperature. Excessive temperatures in the cutting zone lead to enhanced tool wear on the one hand, and surface defects such as white layer formation and residual tensile stresses on the other hand. In this article, the temperature development is investigated for typical tool geometries and cutting parameters in broaching. Furthermore, the possibility of a temperature control using intermediate variables such as process forces is discussed, and potentials employing a control are explained.
Development of a Drum-Type Manufacturing Method for Electroplated Diamond Wire Tools
Authors: Yang Sheng Miao , Tani Yasuhiro , Zhang Yu , Murata Junji
Published: November 2012

Diamond wires are widely used in cutting hard and brittle materials such as silicon, sapphire, etc. However, present low production efficiency of diamond wires causes their high cost. To solve the problem, a drum-type manufacturing method for electroplated diamond wire tools was developed. Multi diamond wire tools could be manufactured simultaneously at high speed with a single machine. Electroplating characteristics of developed method were evaluated. Additionally, composite electroplating experiments were carried out to find optimal conditions for manufacturing diamond wire tools.
A Valveless MEMS Pump Utilizing a Thin Film Permanent Magnet
Authors: Zhi Chao , Shinshi Tadahiko , Uehara Minoru
Published: November 2012

A valveless MEMS pump utilizing a multi-layer thin film NdFeB/Ta permanent magnet (TFPM) has been presented. The MEMS pump consists of a diaphragm actuator utilizing 6μm in thickness and 3 mm in diameter TFPM which is bonded on a membrane made of polydimethylsiloxane (PDMS) of about 80μm thickness, a pump chamber and a pair of diffuser elements. TFPM is sputtered on a 50μm thick Nb sheet. The diffuser elements are used to generate a one-way fluid flow. The chamber is made of acryl plates. UV negative film resist is used to bond different layers. Applying amplitude of ±7.5V square wave voltage, the pump flow rate reaches to 130μL/min at frequency of 15Hz.
A Micro-Stage for Linear-Rotary Positioning
Authors: Peng Yu Xin , Ito So , Shimizu Yuki , Gao Wei
Published: November 2012

In this paper, a novel Z-θZ micro-stage is designed and constructed by utilizing an impact friction drive. The stage is configured by two driving units, a moving element and a stage base. Each driving unit consists of two PZTs and a friction element. One end of each PZT is fixed on the stage base, and the other end is attached on a permanent magnet as the friction element. The moving element, which is a steel cylinder, is supported and moved by the friction element. Magnetic force generated by permanent magnet is utilized to stabilize the driving condition between the moving element and the friction element for the friction drive. The size of the stage is less than 1 cm3. The stroke and the maximum speed of the stage in the Z-direction are 3.8 mm, 5.7 mm/s, respectively. The stroke in the θZ-direction is unlimited and the maximum rotational velocity is 26 rpm.
Study on Micro/Nano-Indentation of Typical Soft-Brittle Materials
Authors: Hang Wei , Zhou Li Bo , Shimizu Jun , Yamamoto Takeyuki , Yuan Ju Long
Published: November 2012

As a typical multi-functional single crystal material, Lithium tantalite (LiTaO3 or LT) exhibits its excellent electro-optical, piezoelectric properties and has now been widely applied into many applications, such as surface acoustic wave (SAW) filters, isolators and other photoelectron devices. Compared with other functional crystals like silicon and sapphire, LT behaves much more brittle and softer. The knowledge of precision machining built on conventional hard-and-brittle materials is no longer applicable to this new type of soft-and-brittle crystal. In order to clarify the fundamental mechanical properties of LT, micro/nano-indentation tests are conducted in this study. The obtained results are analyzed and discussed to understand the behavior of this type of materials in their machining process.
Vibration Suppression Control Using Vibration Node of Articulated Robot with Multiple Vibration Modes
Authors: Hamamatsu Hiroshi , Hitaka Yasunobu , Furuno Seiji , Matsuo Takayuki
Published: November 2012

A high-speed, highly accurate positioning operation is required for industrial robots. However, residual vibration is generated in high-speed operation because industrial robots are cantilever structure. It takes the long settling time to the positioning operation. Acceleration feedback control is effective for vibration control. In the robot with two or more modes of vibration, the vibration mode besides targeted mode is excited by the difference of the vibration phase. In this paper, the phase relation and the vibration mode shape are clarified, and it aims at the control of the two or more modes using vibration node of the mode. The vibration modes are clarified by a modal analysis, and the vibration is controlled by the acceleration feedback. Using the vibration node of the mode stabilizes the difference of the phase of the first mode and the second mode. The effect of vibration control is verified by the experiment.