bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of Bio-Material Liquid Film and its Function of Reducing Soil Water Evaporation
Authors: Li Dan , Lv Jing , Ni Wu Zhong
Published: September 2011

Surface mulch is regarded as an effective manner to reducing soil water evaporation, but limited with the adverse influence of plastic film mulch on agro-ecosystems. In this paper, liquid films were prepared with the foundation of kelp as a bio-material. The results showed that the films prepared with the mixture of kelp and polyvinyl alcohol (PA) had superimposed layering structure with tiny pores and gaps, and were stable as well as degradable under field water conditions. The results of the simulative experiments with both of aquic sand-loamy soil and yellow silt-loamy soil that mulching with the film of the mixture of kelp and polyvinyl alcohol (PA) could significantly (P<0.01) reduce water evaporation from soil. It was also found that mulching with the liquid films could increase the water retention capacity of the tested soils. As the initial material – kelp is available, the application of the developed liquid film based on kelp for efficient soil moisture management in agricultural production should be recommended.
Study on Bearing Dynamic Properties of Nano-Particle Reinforced ZA27 Alloy Composite Material
Authors: Qin Zhou , Ma Kun Peng
Published: September 2011

Although the zinc-aluminum alloy has gotten substantial increase in terms of strength and friction characteristics than the traditional zinc alloy, it has limitation in the operating temperature and speed. In order to further improve the frictional characteristic and expand its application range, we adopted the inexpensive zinc-aluminum alloy of ZA27 reinforced by TiC nano-particles to replace the traditional bronze alloys (ZQSn6-6-3) to produce bearing bush. And through its dynamic performance of the finite element analysis to prove particle reinforced ZA27 bearing bush has good dynamic performance.
Design of Emergency Call System of Forklift Based on the Existing GSM Network
Authors: Deng Qun , Zhang Wei Qiang
Published: September 2011

Using the existing GSM network for location is currently a hot, but usually the system only can complete the location function, and could not communication with others. For the purpose of the voice communication between the mobile terminals in forklifts and the service center, this paper designed a new emergency call system to overcome the above disadvantages, and especially taken their applications into consideration.
Microstructure and Property Research of T91 and T23 Heat-Resisting Steel Welding Joint
Authors: Wu Guang Feng , Zhang Xiao Bin , Xu Hui Bin
Published: September 2011

Microstructure in the welding zone, mechanical and electro-chemical corrosion properties of high matching T91/T23 heterology heat-resisting steel welding joint were investigated. Experimental result shows that good welding joint was made by high matching and argon tungsten arc process. Micro-structure of the weld metal was tempering lath martensite with coarsing crystal grain. Microstructure in the HAZ of T23 steel side was mainly granular bainite and lath bainite; micro-structure of HAZ at T91 steel side was mainly tempered sorbite and tempered martensite. Hardness nearbynearby the fusion zone of T91 steel was the highese, and weak carbon migration were found nearby the fusion zone of T23 steel side weld junction. Corrosion resistance properties by turns of from large to small were: welded joint, T91 base metal , T23 base metal.
The Relationship of NaOH Molarity, Na2SiO3/NaOH Ratio, Fly Ash/Alkaline Activator Ratio, and Curing Temperature to the Strength of Fly Ash-Based Geopolymer
Authors: Abdullah Mohd Mustafa Al Bakri , Kamarudin H. , Bnhussain M. , Ismail Khairul Nizar , Rafiza A.R. , Zarina Y.
Published: September 2011

Geopolymer, produced by the reaction of fly ash with an alkaline activator (mixture of Na2SiO3 and NaOH solutions), is an alternative to the use of ordinary Portland cement (OPC) in the construction industry. However, there are salient parameters that affecting the compressive strength of geopolymer. In this research, the effects of various NaOH molarities, Na2SiO3/NaOH ratios, fly ash/alkaline activator, and curing temperature to the strength of geopolymer paste fly ash were studied. Tests were carried out on 50 x 50 x 50 mm cube geopolymer specimens. Compression tests were conducted on the seventh day of testing for all samples. The test results revealed that a 12 M NaOH solution produced the highest compressive strength for the geopolymer. The combination mass ratios of fly ash/alkaline activator and Na2SiO3/NaOH of 2.0 and 2.5, respectively, produced the highest compressive strength after seven days. Geopolymer samples cured at 60 °C produced compressive strength as high as 70 MPa.
Prediction Method of the Dent Depth of Composite Laminates Subjected to Quasi-Static Indentation
Authors: Ye Qiang , Chen Pu Hui , Shen Zhen
Published: September 2011

A method was developed to predict numerically the dent depth of composite laminates subjected to quasi-static indentation. A progressive damage analysis was conducted for composite laminates under quasi-static transverse compressive loading by using a strain based Hashin and Yeh failure criteria as well as the FEM, and a series of degraded elastic constants of the damaged zone were drawn from the numerical results. The effective elastic constants of the damaged zone of the laminates were reevaluated according to Sun’s explicit expression. Finally, the dent depth vs. indentation force curve was predicted based on Swanson’s contact theory. The numerical simulations on the static indentation tests of T700/BA9912, T700S/5228 and T700/QY9511 laminates were done via this method. The numerical results agree well with the test data in the terms of the contact force and the corresponding dent depth.
Design and Simulation of Pastry Slicer Based on SolidWorks and ADAMS
Authors: Qiu Shi Yin , Wu Hai Tao , Liu Hong Bin
Published: September 2011

A new type of pastry slicer which could alter pastry thickness expediently was designed by using SolidWorks and ADAMS. In the first place, the pastry slicer 3D model was established by SolidWorks and imported into ADAMS by the nicer interface between SolidWorks and ADAMS. In the second place, the pastry slicer 3D model was simulated in ADAMS. The dynamics simulation result showed that the pastry slicer could fulfil the anticipative design requirements. The simulation analysis results could be regard as the design reference for the new type of pastry slicer, and the virtual prototype could be used to do a deeper analysis according to different requirements.
Tensile Mechanical Properties of Wood Fiber / PVC Composites
Authors: Duan Jie Li , Jiang En Chen , Lu Yu Hua
Published: September 2011

The influencing effects of the content of wood fiber, particle size and content of titanate coupler on the tensile properties of wood fiber (include the pine powder and the rice husk powder )/PVC composites (WPC) were investigated. The results showed that the tensile modulus of WPC are increased, the tensile strength and the elongation at break of WPC are decreased slightly when the wood fiber changed from 30 to 60( phr method) . Between 150μm and 165μm in the size of the diameter, the tensile strength of WPC increased by 11.5%, however it is increased by 5% between 165μm and 315μm. The content of titanate coupler affected significantly, the tensile properties of WPC appeared first increased and then decreased when the content of titanate coupler is increased from 0 to 3.5 shares( phr method). Added the same content of pine powder or rice husk powder, the tensile modulus and the tensile strength of WPC which filled pine powder are bigger, but the elongation at break of WPC which filled rice husk powder are bigger.
Mechanism Study on the Coiled Tubing Deformation under a Combination Loading
Authors: Li Lei , Shen Zhao Xi , Wang Peng
Published: September 2011

The tendency for coiled tubing to grow in diameter and thin in wall under a combination loading of internal pressure and cyclic bending. This can occur in spite of the fact that nominal stresses due to internal pressure loading are well within elastic limits in both hoop and radial directions. The deformation mechanisms are described. Fatigue tests of 10 coiled tubing specimens are finished. The results show that the trends in coiled tubing deformation behavior are according with the context of theory.
Microstructural Characterization of Rapidly Solidified Al-High Si Alloys
Authors: Atkinson H.V. , Alshmri Faraj , Hainsworth S.V. , Lawes S.D.A.
Published: September 2011

Aluminium silicon alloys are the most used raw material for automotive applications. One of the main limitations on using aluminium high silicon alloys is the formation of coarse brittle phases under conventional solidification conditions. However, rapid solidification processing (RS) (for example, through melt spinning) is very effective in limiting the coarsening of primary silicon due to the high cooling rate. In the present work, characterisation of the material at the first stage of production as melt-spun ribbon and flake has been carried out. The microstructures show typical characteristics of a ‘featureless zone’ on the wheel-side and coarser microstructures on the air-side, with clusters of silicon particles evident. At high magnification, on the wheel-side, TEM and FEGSEM reveal local variations in the silicon and aluminium content (although on average there is no macrosegregation from the wheel-side to the air-side during solidification). In FEGSEM, the ‘rosette-structure’ also displays local variations in Al, Si, Fe, Cu and Ni over a scale of a few microns.
Synthesis, Characterisation of Al2O3-Cu Nano Composite Powder and Water Based Nanofluids
Authors: Suresh S. , Venkitaraj K.P. , Selvakumar P.
Published: September 2011

Nano materials have made a revelation in all fields of engineering and technology. Materials of size less than 100 nm are termed as nano materials. The excellent properties of nano materials have attracted the scientists and engineers more towards nano technology. Solid nano particles dispersed in the base fluids such as water or ethylene glycol are called nanofluids, especially used to increase the heat transfer capability of base fluids. In this work we have synthesized Al2O3-Cu nano composite powder in a thermo chemical route that involves the preparation of precursor powder from metal nitrates and hydrogen reduction technique. Two different proportions of precursors were used to obtain the nano composites of two different proportions. The prepared powder was characterised using XRD, SEM and EDS. Water based hybrid nanofluids were prepared and their stability have been studied for different volume concentrations.
Research on Reconstruction 3D CAD Data of Automotive Panel Based on Reverse Engineering
Authors: Zhan Xiang Hui , Li Xiao Da , Liu Xiang Yang
Published: September 2011

The processes and methods of reverse engineering are presented in detail through a practical case in this paper. Point cloud acquisition, data processing and model reconstruction are the key techniques in reverse engineering. The sample’s point cloud acquired by laser scanner is processed in Geomagic, and the boundary and characteristic line are extracted simultaneity. Finally, the surfaces are constructed and modified, and the CAD model is reconstructed in NX. The research indicates that the reconstruction data by reverse engineering is an effective technique, which can bring about high quality model and improve efficiency.
The Characterization of Different Doses of Electron Beam Irradiation on the Structure and Properties of PAN Precursor Fibers
Authors: Yu Hong Wei , Yuan Hui Wu , Wang Yuan Sheng , Wei Zheng
Published: September 2011

Different doses of electron beam was imposed on polyacrylonitrile(PAN) precursor fibers before the fibers were stabilized. The effect of electron beam irradiation on the chemical structure, orientation degree, surface morphology and tensile properties of PAN precursor fibers were characterized by use of fourier transform infrared spectroscopy (FTIR), tensile test and scanning electron microscope (SEM), respectively. The results showed that the extent of cyclization and orientation degree was increased firstly and decreased later. The surface morphology of PAN precursor fibers was smoother when the irradiation doses 150kGy and 200kGy. Tensile strength of the fibers was increased first and decreased later. The change of tensile strength might be in correlation with the changes of extent of cylization, orientation factor and surface morphology.
Investigation on Properties of a New CB/WPUA Composite Coating
Authors: Zhang Tong , Wu Wen Jian , Zhang Liang , Dai Xiao Dong
Published: September 2011

By grafting carbon black (CB) with multifunctional waterborne polyurethane acrylate (WPUA), a series of environmental-friendly CB/WPUA black coatings with different CB contents were prepared in this study. The chemical structures of the products at different synthesis stages were analyzed by Fourier-transform infrared spectroscopy (FT-IR), and the influence of carbon black content on the properties of coatings was systemically investigated. The experimental results demonstrated that the WPUA/CB composite coatings with more CB contents had higher viscosities and impaired unsaturation conversions of WPUA. However, the coating containing 4 wt% of CB obtained the best water resistance and tensile strength owing to incorporate organic-inorganic structures, which is of importance for practical application.
Flow Stress Constitutive Equation of AZ31 Magnesium Alloy for Hot Compression
Authors: Wu Wen Hua , Lou Yan
Published: September 2011

The AZ31 magnesium alloy flow stresses have been investigated in the strain rates of 0.03~3s-1 and temperature range of 300~400°C. The result showed that dynamic recovery and dynamic recrystallization occurred obviously during the hot compression of AZ31 magnesium alloy. In order to represent the flow stress of plastic deformation accurately, the constitutive equation was built by using the dynamic recovery model and dynamic recrystallization model, and its parameters of the constitutive equation were determined by multivariate nonlinear regression analysis. The two-step constitutive equation not only expressed the variation of flow stress with strain rate, deformation temperature and strain, but also revealed the characteristic of dynamic recrystallization kinetics of AZ31 magnesium alloy. Its accuracy was higher than the flow stress of hyperbolic sine model, and the maximum relative errors of two constitutive equation models calculation values compared with experiment data were 5% and 6.5% respectively.
Preparation of Flexible Graphite Sheet with Fine Flake Graphite
Authors: Lai Qi
Published: September 2011

Flexible graphite was prepared using the fine flake graphite that could go straight through 149-85μm mesh as raw material, using sulfate acid and nitrate acid as inserting agent and Potassium permanganate as oxidant. The best oxidation reaction conditions are as follows: VSulfate acid/VNitrate acid=5:1, m (fine graphite)/m (Potassium permanganate)=1/0.12, the limited temperature is about 1100-1200°C. Under such condition, the expansion volume of the fine flake graphite with 250-149μm can be reached to 341ml/g. The graphite with 149-85μm can be reached to 230ml/g, the qualities of flexible graphite sheet when intensity is 1.20 g/cm3 are as follows: tensile strength is 4.09 Mpa; ash ratio is 2.19%; recovery rate is 7.8%; compression ratio is 44.0%, TG at 450°C is 0.32%; TG at 600°C is 18.97%; Stress relaxation rate is 3.1%.
Study on the Relationship between Hydraulic Support on the Working Face with Large Mining Height and Surrounding Rock
Authors: Ma Ying , Zhong Sheng
Published: September 2011

Using unified model and theory of rock pressure, the problems, such as caving of stope roof with large mining height and destruction of support, strata movement and surface subsidence, are unified analyzed and researched. The results show that: pressure shell is dynamic shell, which moves forward with the propulsion of working face; with the increase of mining height on the face, the height of fracture zone in coal seam increases, not continuously, but jumpily; with the increase of mining height, support load rises, but the degree of this rise decreases gradually, increased degree of immediate roof weight should be greater than that of given deformation pressure. The results provide necessary basis for reliability of hydraulic support on the working face with large mining height and safety work in the underground.
A Self Motion and Rotation Video Nodes Coverage Algorithm
Authors: Tang Lei , Yu Cheng Da , Zhang Chao Wei , Wang Yong Feng
Published: September 2011

This paper presents a self motion and rotation video nodes coverage algorithm. Through software simulation and calculation, building hardware experiment platform, the block field and the overlapped field avoid experiments, It shows that the algorithm can makes the node identify and avoid the block field itself, avoid block and towards the angle of rotation, and reduce the neighbor node area of ​​the overlapped field, and obtain better coverage rate and monitoring results. It enhanced the underlying control techniques for the wireless sensor networks and self-organizing ability, so as to make the wireless sensor network more suitable for the battlefield environment.
Dynamic Research and Design on SINS Damping System in Vehicle
Authors: Li Jie , Tao Rui Ping , Liu Jun , Chen Wei
Published: September 2011

For the vibration noise problem of strap-down inertial navigation system in the vehicle, a better vibration damping system was designed. Based on the vibration characters of the vehicle environment, a vibration damping model fitted the SINS in the vehicle was presented; and then the mechanism of vibration damping system was designed especially; and then the design of vibration damping system was verified by using of the dynamic characteristic analysis, On the basis of the above analysis, the overall structure of actual vibration isolation system was built, and then the test for the vibration isolation system was made, the results show that the micro-isolation system for the SINS system vibration and noise has a better inhibition effect, and the applicability and the dependability of the vibration damping system is verified by the test results, which provides reference basis for the design of the strap-down inertial navigation damping system in the land vehicle and provides techniques for the better application of SINS in other fields.
Direct Torque Control of Asynchronous Motor Based on Flux Auto Switching
Authors: Li Shi Qiu , Hao Shu Ai , Ma Xu , Cheng Yong Mei
Published: September 2011

Based on the theory of direct torque control, the simulation model of asynchronous motor is designed to solve two problems. The one is that asynchronous motor in high speed, if a single circular flux control method used, its switching losses will be great; the other one is that asynchronous motor in low speed, if a single hexagonal flux control method used, it will make a large harmonic current. So double modes are used in solve problems together in this paper. That is when asynchronous motor runs at low speed circular flux control strategy is adopted, and when it runs at high speed hexagon flux control strategy is adopted. Auto-switch between circular flux control strategy and hexagon flux control strategy is achieved. Simulation results show that not only the harmonic current can be reduced, and the switching losses are reduced effectively by smooth switching the two control strategies.
Research on the Broaching-Load Testing System of Hydraulic Broaching Machine
Authors: Xu Ming , Ni Jing , Chen Guo Jin
Published: September 2011

In view of the disadvantages on working vibration or even cannot work of broaching machine derived by broaching-load’s uncertainty, a testing system of broaching-load is designed. The testing system uses an industrial computer, a high-precision data-acquisition-card, two pressure-sensors, a displacement-sensor and Borland C++ to test the broaching-load on the base of broaching machine’s electronic control system. The factual application in hydraulic broaching machine shows that the proposed system has a good performance on testing-accuracy. The proposed system gives an effective solution to broaching-load testing.
Adaptive Impedance Control for Robot Based on Estimation of Environmental Parameters
Authors: Li Zhan Ming , Li Er Chao
Published: September 2011

In order to realize precise contact tasks with an unknown environment, robotic force controllers have to adapt themselves to the unknown environment. Some impedance controllers are designed for several representative environmental parameters, A BP neural network is proposed to determine the one-to-one mapping relations between the environmental parameters and the impedance parameters. However, it is difficult to accurately know the environmental parameters in the case of a changing environment, RLS is proposed to estimate environmental parameters, then determine the impedance coefficients to control the robot. Simulations prove that the controller designed is feasible and effective.
A New 2T-2R Hybrid Parallel Manipulator
Authors: Chen Wen Jia , Zhao Lan Lei
Published: September 2011

Though computer technology has brought about virtual manufacturing to expedite design and analysis through simulation and visualization, machines remain essential, as ultimately products need to be made. There is a need for equipment providing more than three degrees of freedom (DOF) arranged in parallel and based on simpler arrangements than 6-DOF arrangements in application. This paper presents a new 4-DOF hybrid parallel platform manipulator with ﬁxed-leg lengths and base mounted prismatic actuators. The movable platform of the manipulator can translate along two directions and rotate around two axes respectively (2T-2R). The kinematics model is formulated, which describes the inverse and forward kinematics transformation. It is very easy to develop a 5-axis NC machine-tool which is of large-workspace based on the 2T-2R, 4-DOF parallel mechanism presented in this paper.
A Kind of Land Form Detector for Loose and Soft Sandy Soil Milling-Planing and Collecting Device Machinery
Authors: Qiu Shi , Hu Hao , Liu Jun Peng , Lv Xiang Hui , Wang Xiang Li , Li Wen Jie
Published: September 2011

In a Certain Mining Engineering, it’s Needed to Collect the Ore Bearing Sandy Soil with Certain Thickness from the Ground Surface. in Order to Realize Accurate Collection, it’s Needed to Control the Collecting Thickness Strictly. the Application of Contacting Type Landform Detecting Method in the Engineering Machinery Was Discussed, and a Kind of Mechanical Contacting Landform Detector Was Developed for the Alluvium Landform of Mining Area in Gobi with Loose, Rough and Uneven Ground Surface. the Landform of Soft Sandy Soil Can Be Detected by Controlling the Contact Pressure between the Depth Wheel of the Detector and the Ground Surface. with the Use of PID Control Technology with Wave Filtering, the Real-Time Detection Accuracy of the Detector for Mixed Sandy Soil Ground Surface Reaches ± 3mm. this Detector Is Specially Used for Milling, Planing and Collecting Device, Achieving Uniform Thickness Collection of Ore Bearing Sandy Soil in Rolling Topography Condition.
Design of a Hand Exoskeleton Rehabilitation Device
Authors: Bi Qian , Yang Can Jun
Published: September 2011

As stroke is one of the most morbidity disease, some rehabilitation devices has been developed to solve the problem, but there isn’t maturation in hand. This paper presents a new hand exoskeleton rehabilitation device to improve the result of rehabilitation and help doctors to perfect theory about hand rehabilitation. We set 8 DOF in this three fingers device, with 2 active DOF and 1 coupled DOF in index or middle finger, 1 active DOF and 1 passive DOF in thumb. The 5 active DOF is driven by motors. The transmission consists of screw nut and multi-link mechanism. We control the device through a typical secondary control system. As this device is designed to help patients not only regain the range of flexion/extension but also complete some typical simple grasping movements. To substantiate the feasibility, an experiment has been carried out. Finally, Suggestions for improvement are given.
On-Line Test System of Air-Condition in Automobile
Authors: Sun Fang Fang , Liang Cai Ping , Li Peng
Published: September 2011

Because of better comfort, air-conditioning (AC) systems are a common feature in automobile these days. Testing the performance of AC systems before automobile are sold in order to decrease AC systems repair rate become more and more urgent to auto manufacturers. An on-line test system of AC systems in automobile is designed in this paper; this system can test temperature, humidity, and wind speed of AC systems when automobile are moving on production line .Users can determine AC systems are qualified or not by these measured values.
Design of CMOS Amplifier Using New CCII Topologies
Authors: Cheng Li , Li Ning , Xi Jia Jian , Yang Ning
Published: September 2011

A high-precision amplifier design in a stander 0.35μm CMOS process was proposed. This design obtains a high-performance by proper application of dynamic element matching to a second generation current conveyor (CCII). In comparison with the traditional CMOS circuits, the proposed approach can not only increase the output swing and decrease output resistance but also compensate the effect of the input offset and 1/f noise voltage. The simulation results show that the gain error is reduced 38~50 times than the traditional amplifier, and the precision is significantly improved. So the proposed circuit is suitable for the design of special amplifiers used in various detections and signal mediation.
Application of Intelligent Characteristic Model in Alumina Concentration Control System
Authors: Zhou Tian Pei
Published: September 2011

In electrolytic aluminum production processing, the measurement and control of alumina density is one of the three most important control aims. However, due to alumina density can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina density control method is very important. In this paper, alumina density is controlled by single neural adaptive PID controller in electrolytic aluminum production processing, and alumina density based on intelligent characteristic model is established by using the intelligent characteristic model method, takes the model as the control model, alumina density is controlled combination of the two advantage, which achieve a good control effect.
Shuttle-Type Passive Control System for Pressure Pipeline Conveying
Authors: Chen Kun , Zeng Xiang Wei , Qiu Xiao Ping
Published: September 2011

In this paper, we compare the shuttle type passive control system and the existing technology in detail firstly, what is called passive control is a technology which the passive shuttle control system relies on the energy from the system itself or our natural cycle, such as the gravity flow, the pressure flow, the pressure difference to achieve self-regulation and control without other outside power and active devices. And then we introduce the new shuttle type control units including shuttle type return valve, shuttle-type exhaust and air-adding valve, and the adjustable difference flow pressure safeguard and their applications using several examples, which shows that the shuttle type control series valves are latest best choice for the modern pipeline conveying engineering with simple frame, lost cost and high reliability.
Design of a Speech Decoding System Based on Cortex
Authors: Zhang Hui
Published: September 2011

In consideration of the importance of phonetic system, the oral broadcasting systems have appeared in more and more places such as subways, bus stations and supermarkets and so on. The aim of this paper is to introduce a high performance speech decoding system based on Cortex. On the basis of introduction to each part, the function of main chip has been described in detailed. The interface of main chips has been defined. The software structure is also discussed. The system adopting Cortex as microprocessor, 5605 as the MP3 decoder chip, can decode MP3 and WMA files stored in SD card. Equipped with a character LCD display module, the system performance has greatly improved by using Cortex processor.
Control Strategy Study on Drum Water Level of Supercharged Boiler Based on Radiation Energy Signal
Authors: Zhou Guo Yi , He Wen Sheng , Zhou Huai Chun
Published: September 2011

The deficiencies of drum water level control system and unstable combustion of supercharged boiler could result some serious accident such as water level fluctuating greatly, pipes in furnace overheating and bursting, boiler loss water. In order to solve the problems, flame detect system was used to get flame images of boiler's furnace, and radiation energy signal was introduced into drum water level control system to add one auxiliary control loop of combustion side. The new control strategy was established and simulation model was set up. The simulation results show that the new control system could adjust feed water within 20s, and eliminated the disturbance of water level within 60s by way of monitoring radiation energy signal, the fluctuating range was also decreased significantly.
The Analysis on Fire Smoke Exhausting Robot Vibration Based on Wavelet Transform
Authors: Fang Shu , Hu Bin , Liu Sheng Peng
Published: September 2011

Belt relaxation, which affects a lot on operation reliability of the fire smoke exhausting robot, is hard to detect. In this paper, a new method for belt relaxation feature recognition based on continuous wavelet transform (CWT) is proposed, and a vibration model which simplified the robot as a 2-dof forced vibration system under harmonic excitation is established. The vibration acceleration signal has been collected using the IEPE sensor and data acquisition card, experimental results verified the accuracy of the vibration model, and weak impact signal caused by the belt relaxation was distinguished, that testify the practicability of the CWT method in belt relaxation feature recognition.
An Alternative Method of Preoperative Planning for Fibula Free Flap in Mandibular Reconstruction
Authors: Chen Ya Dong , Qin Xing Jun , Wu Wen Zheng , Cui Xiao Yu , Li Hu , Wang Wan Shan
Published: September 2011

The most frequent cause of defect in the mandible is tumor-related surgery. Larger defects cause severe morbidity due to disturbances in function and esthetics. A fibular free flap is one way of filling a bony hole in either the upper or lower jaw. It is one of the common ways of replacing bone that has been removed for cancer treatment. Doctors use a free fibular flap which is grafted from the patient who needs a transplant operation to fit the defect. In this study, a new method combining preoperative planning and rapid prototyping for mandibular fibula free flap reconstruction after tumor surgery was made based on Mimics software simulating surgery on a workstation. The preparatory work of surgery is divided into two parts: software simulation and model building. During software simulation the authors were able to choose the best site for the osteotomies regarding circulation and the model building can increase the precision and speed of treatment. A description of our surgical approach is presented and is supplemented by an illustrative case.
Energy Regulation Based Close-Loop Variable-Speed Valve-Controlled-Motor System
Authors: Xu Ming , Jin Bo
Published: September 2011

A new energy-saving method with an energy regulation device (ERD) is presented. The ERD is composed of an accumulator, a proportional throttle valve and a safety valve. Due to the addition of the proportional throttle valve, the ERD becomes a flow-controllable element. It can adjust energy according to the system demand. The principle of energy regulation based close-loop variable-speed valve-controlled-motor is discussed in detail. And it can be conclude that the proposed close-loop scheme can gain a good response as the valve control system while the power is less obviously.
Parameter Identification of Inertia Properties of Space Robot Based on Momentum Conservation
Authors: Wang Chao , Gao Yong Ming , Du Xiao Ping
Published: September 2011

The parameter identification is necessary for precise control orbit and attitude of Space Robot. This paper presents a method for parameter identification of inertia properties of space robot which is based on the momentum conservation. As the initial momentum of the Space Robot is hardly known, we have to discuss detailed in two options. The first option, the initial momentum is known and assumes it is zero, then we can solve all the unknown parameters in the momentum equations; the second it’s unknown, it has to be solved in two steps. The first step is to identify the mass and mass center of the spacecraft; and the second step is to identify the inertia tensor of the spacecraft. In the end, we build the model for simulation; the result shows that the method has the high precise and the error can be ignored.
Design and Application of Network Borehole-Ground Electrical Measurement System
Authors: Shao Lei , Lin Jun
Published: September 2011

Borehole-ground Electrical measurement is an important geophysical exploration method to determine the underground distribution of remaining oil. The author designs a set of network measurement system, where the intelligent electrodes were arrayed. Potentials are measured continuously to realize the dynamic monitoring. We adopt multi-channel simultaneous sampling and linear accumulated digital averaging to suppress electromagnetic noise. Feedback compensative method is used to exclude the influence of SP (spontaneous potential) and covers a wide dynamic measurable scope. In order to make all measurements validity, all electrodes earthing situation are collected. We present the oilfield survey data measured by this self-developed instrument. Practical application shows that the system is characterized with high efficiency, portable and strong anti-jamming capability.
Uncertainty in Project Management Based on Lean Construction Implementation
Authors: Qiu Xin
Published: September 2011

With capital projects consistently running late and over budget in urban economics, it is time to look at project managers could do to step up their implementation success and performance. In real estate industry, China, there are many uncertainties and risks for project management. Lean has been continuously adopted in the construction area as an innovated effort striving to improve productivity and to value clients’ needs. Comparing with traditional construction management, this paper proposes some applications in Lean including Last Planner System (LPS) to identify uncertainties and provide solutions.
Design of Electric Connector’s Automatic Assembly System
Authors: Ren De Zhi , Guo Yu Guang , Xu Li Ping
Published: September 2011

For improving assembly quality and automation of electric connectors, a solution of automatic assembly is discussed in this paper. With the machinery vision system, defects of the parts to be assembled can be real-time surveyed. By using the complex image recognition technology, the recognizing accuracy and reliability can be achieved. The designs of NC dividing head and smart positioning unit can make the process of transmission and assembly more perfect and effective. The optimal design of the mechanical structure has been made by virtual prototype technology. The designs of PLC control system and pneumatic system which are used in the automatic assembly machine have also been discussed. The control strategies of assembling process are quite challenges. The control profile of three stages has been used in the pressing assembly process, which can punch the parts assembled properly and smoothly without any surface damage. Also the application shows that the design is effective.
The Design of Embedded Motion Controller Based on DSP and Development of Driver under Linux
Authors: Tang Guang Jun , Jiang Ting Biao
Published: September 2011

In this paper, in order to solve the problem of PC-based CNC system, such as instability high cost, large volume so and on , an embedded motion controller based on S3C2440 system bus is designed by using S3C2440 microprocessor and PCL6045B special DSP chip. Hardware interface circuit and address mapping between ARM and PCL6045B are introduced in detail, and some interface functions of the motion controller base on multi-tasking Linux operating system is designed. At last, the driver development and driver debugging of PCL6045B motion control chip under Linux are focused on. The result indicates that this controller can not only improve the real-time performance and reliability of system under the support of Linux, but also reduce the cost greatly.
Wet Gas Flow Rates Computation System for Unattended Operational Natural Gas Well Based on ARM
Authors: Xu Ying , Fu Chun Ming , Ma Ruo Shun , Zhang Qiang
Published: September 2011

In order to measure the gas and liquid flow rates of the wet gas on line not separation, this paper develops a wet natural gas two-phase computation system, which accompanies with the dual throttling wet gas flow meter as a secondary instrument. This flow computation system is based on ARM9 embedded system with the Linux OS and is powered by a solar power system. A hardware and software platform of a secondary instrument working for the flow rates computation is constructed for unattended operational natural gas wells. The signal acquisitions of the pressure, differential pressure, temperature, and the calculation of two phase metering model have been actualized. In addition to the basic function, the system provides display, storage, and historical data inquiry of the instantaneous and accumulative flow rates, as well as the GPRS wireless communication. It has already been trial run at some unattended operational wellheads for the gas and liquid metering of the wet gas.
Design of Intelligent Control and Diagnosis System of Aquaculture Based on PROFIBUS
Authors: Peng Fang , Zhou Wen Hui
Published: September 2011

In order to improve the level of intensive factory aquaculture, an intelligent monitoring system with PROFIBUS-DP network is designed. The main parameters of the culture environment and their control methods are discussed. The human-machine interface and database are developed to achieve real-time acquisition, monitoring and process of culture data. A disease diagnosis system combining with case-based reasoning and fuzzy logic is designed, which provides great convenience for the users and improves the quality of aquaculture.
Denoising Algorithm Based on Correlation of Inter Scales Wavelet Coefficient for Damage Signal of Wire Rope
Authors: Zhan Wei Xia , Tan Ji Wen , Wen Yan
Published: September 2011

In order to remove noise in the broken wire signal of wire rope, a new denoising algorithm based on the correlation of inter scales wavelet coefficient was proposed. Because the wavelet coefficient of signal has strong correlation and the wavelet coefficient of noise does not has obvious correlation, in the process of calculating threshold, an inter scales correlation factor was constructed considering the part specialty of next scale on the same position after wavelet transform. The proposed factor can adaptively adjust threshold on the position of signal and noise, thereby otaining good denoising effect and holding the break information in original signal. The actual processing effect of simulation and damage signal of wire rope shows that the proposed method, compared with the classical threshold, not only effectively removes noise in original signal and improve the signal noise ratio(SNR),but also retains the break information of inspected damage signal of wire rope.
Product Innovation Design Knowledge Acquisition System Based on MAS
Authors: Luo Jian She , Li Wen Qiang , Jiang Jie
Published: September 2011

In order to help the designer collect relative materials from expanding Internet, a product innovation design knowledge acquisition system based on MAS has been developed. Information on the Internet can be divided into structured data, non-structured data and semi-structured data, and two different acquisition processes from different sources were established. Based on aforementioned, the framework of the system was established with federal system of MAS. Layered structure feature was applied in each internal federal system. Finally, the development environment was selected, and three-tier B/S architecture was adopted. Each function modules with system were fulfilled by programming.
Design and Simulation for Control System of Tobacco Leaf Roasting Based on Fuzzy-PID Control
Authors: Li Sheng Qian , Yang Xiao Jing
Published: September 2011

This paper aimed at the characteristics of the control system of baking in different period of tobacco leaf roasting process, intelligent control system of tobacco leaf roast control tactics based on fuzzy-PID is proposed. A designing method and Implementation algorithm of fuzzy-PID is given. For the difficulty of traditional PID controller parameters adjusting, the PID parameters were adjusted online by using fuzzy reasoning method. It can combine the advantages of general fuzzy control and traditional PID control in this method, and it is simulated and compared with general PID control on the simulation platform of MATLAB control box. The simulation results show that the fuzzy self-tuning PID controller has good dynamic response curve, short response time, small overmodulation, high steady state precision, and good dynamic and static performance by comparing with the traditional PID controller. Therefore temperature and humidity control of tobacco leaf roasting will perfectly improved by fuzz PID control.
Blind Source Separation Based on Wavelet and Cross-Wavelet
Authors: Wang Jing Hui , Zhao Yuan Chao
Published: September 2011

In this paper, a novel blind separation approach using wavelet and cross-wavelet is presented. This method extends the separate technology from time-frequency domain to time-scale domain. The simulation showed that this method is suitable for dealing with non-stationary signal.
Design of Micro Electromagnetic Vibration Energy Harvester and Storage System Based on Human Motion
Authors: Zhang Yu Bao , Cao Hui Yun , Zhang En Hui
Published: September 2011

According to Faraday's law of electromagnetic induction,the electromagnetic vibration energy harvester can convert the mechanical vibration of human running or walking to electrical energy, the harvester output is through detection/rectification, two-stage of energy storage, stabilize voltage which is able to reach stable voltage of 4.2V,current of 355mA.The whole system doesn’t need external power supply, the electromagnetic vibration energy harvester has produced two part of the electric energy, a part used to storage, and another part provided power supply for circuit chips. Characteristic of the selected chip is low power and high stability. Analyzing the energy harvester’s structure and principles, a basic electronic circuit for storing the electrical energy is also introducing. The amount of output electrical energy about energy harvester is controlled by magnetic field strength, amplitude and frequency of human movement.
A Robust Trajectory Tracking Control Scheme of Two-Link Flexible Manipulator
Authors: Lu Jing Shuang , Du Chun Mei , Zhou Rui , Li Na
Published: September 2011

A simple dynamics model is established based on the two-link flexible manipulator moving within the vertical plane, and a robust simple control scheme is put forward. The advantages of this scheme are simple and good robustness. Only the error signal is needed when designing the control scheme and the acquirement of control signal does not depend on the system model. The simulation results show that this method has a good robustness and stability.
Mixed Vibration Signal Separation and Moving Object Detection Based on Independent Component Analysis
Authors: Qiang Ning , Xiang Fang
Published: September 2011

This article briefly describes the basic theory of independent component analysis (ICA) and algorithms. Independent component analysis (ICA) method is employed to separate the mixed vibration signal, measured from linear sensor array. By calculating the spatial spectrum function, identification and tracking of multiple moving targets achieved. The results show that, ICA can successfully detect and track multiple targets.
Experimental Study of the Variable Stiffness Vibration Isolator
Authors: Shuai Zhi Jun , Yang Tie Jun , Zhou Zhuo Liang , Liu Zhi Gang
Published: September 2011

The traditional passive vibration isolation system can reduce the vibration transmission greatly while the excitation frequency is times higher than its natural frequency. As the external excitation approach its natural frequency, vibration isolator system is invalid. In this paper, a new variable stiffness vibration isolator was designed to solve the low-frequency resonance problem of the traditional isolator by combining toothed electromagnetic spring with passive isolator. Theoretical analysis and experimental results illustrate that this isolator met the design requirements and obtained the no resonance operating characteristic at the low frequency.
Design and Optimization of FCEV Subframe by Integrated Applications of Hypermesh, UG and ADAMS Multi-Platform
Authors: Liao Jun
Published: September 2011

The UG model and finite element model of FCEV subframe are established, and original subframe is simulated in all kinds of ADAMS environment, which result in the force of the conditions obtained. Then the virtual model is build, stiffness and strength analysis are conducted, and a new type of subframe structure is designed based on the analysis results. Magnesium alloy and aluminum alloy are used in optimization of this new structure for the optimal size. Through the comparative analysis on strength, stiffness, mode shape and quality of the new subframe and the original one, it was verified that the new subframe design is reasonable and feasible.
The Identification of Engine Noise Source Based on Simulink Blind Sources Separation
Authors: Gao Jun Wen , Quan Yan Ming , Lin Yong Man
Published: September 2011

AC algorithm of blind sources has been applied to the identification of engine noise sources. However, the testing platform based on the blind separation theory is difficult to actualize some experiments and obtain data in the real environment, or to obtain these requires high cost. Therefore, this paper proposes a new approach to construct an experimental testing platform-Sinmulink Model so as to identify engine surface noise sources. This model is applied to the test of the experimental data. These experiments demonstrate that Simulink model is efficient to identify engine noise source and the testing data accord with that made by the former platform. It is obvious that Simulink model, to some degree, can be used to replace engine surface noise sources testing platform.
Surface Tracking with Robot Force Control in Unknown Environment
Authors: Li Er Chao , Li Zhan Ming
Published: September 2011

Surface tracking with robot force control for position-controlled robotic manipulator is proposed. A neural network is applied to classify the unknown environment based on its dynamic response of the environment, on-line force feedback data are employed to estimate the normal and tangential directions of the unknown environment, the estimated vectors are used to generate the reference trajectory for the target impedance model. Real-time calculates the curvature of curve to be tracked to adjust the speed of the tangential direction, the reference scaling factor is determined by fuzzy reasoning according to current and forecast contact force, in order to adapt the reference trajectory generated for the changeable environmental parameters and control parameters. Simulation is conducted to verify its force tracking capability.