bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation Analysis on Wearing Quantity of Marine Low-Speed Diesel Engine’s Piston Ring
Authors: Chen Guo Jin , Peng Zhang Ming , Yang Jian Guo , Huang Qiao Ying
Published: February 2012

This paper establishes the mathematical model of the piston ring’s wearing capacity for the marine diesel engine, studies the influence of the piston ring’s axial motion and radial motion to the magnetic field’s output signal, computes and analyzes the corresponding relationships of the magnetoresistive sensor’s output and the piston ring’s wearing capacity, and does the on-board experiment on the oil tanker with the 6RTA52U diesel engine. Measuring actually the magnetoresistive sensor’s output corresponding to the piston ring’s wearing capacity of the marine diesel engine confirms the correctness for the mathematical model of the wearing capacity. The research conclusions lay the technical foundation for the online monitor of the piston ring’s wear.
Effects of Electromagnetic Stirring on the Solidified Microstructure of Martensite Stainless Steel
Authors: Zhan Guo Feng , Wang En Gang , Jiang En , Jiang Zai Wei , He Ji Cheng
Published: February 2012

In this text, the effect of electromagnetic stirring (EMS) on the quantities of the martensite stainless steel ingots was investigated by static casting experiment. The results of the experiment show that to compared with the traditional cast, the EMS can obviously improve the quantities of the martensite stainless steel ingots. By the EMS technique, the ratio of equiaxed grains greatly increased and when the current remains content, the ratio of equiaxed grain increases first and then decreases as the stirring frequency increasing. There is a maximum value at the 5Hz. With the EMS the carbon and the chromium in the ingots are better distributed. The segregation of C and Cr is inhabited. And also with the EMS, the grains of the martensite stainless steel ingots become finer and more homogeneity; consequently the appearance and distribution of the troostite in the ingots obviously changed: without the EMS the troostite distributes in net shape or block shape and with the EMS, the troostite distributes in the matrix dispersedly.
Vibration Analysis of Nonlinear Isolator’s Characteristics by ADAMS
Authors: He Zhao Qi , Song Yu Chao , Yu Hong Liang
Published: February 2012

A nonlinear spring-mass model is established to study the dynamic characteristics of nonlinear vibration isolator. By use of ADAMS software, the influence of stiffness, foundation displacement excitation and frequency of external excitation on the nonlinear vibration isolation systems are analyzed. Results indicate that the linear vibration system needs 4s to achieve stability, but the nonlinear vibration system only needs 0.1s. The response value increases with the increase of excitation frequency, the response pick value increases by 61.58% and 102.35% and each corresponding stable value increases by 159.35% and 309.87%.
Selection and Analysis of Parameters in Model Test of Ice Breaking by Air Cushion Vehicle
Authors: Wang Chong , Zhang Zhi Hong , Liu Ju Bin , Yao Jun , Zhang Liao Yuan , Chen Ke
Published: February 2012

In order to validate the theory and select effective operational parameters in practical ice-breaking by air cushion vehicle (ACV), experimental study should be carried on firstly. The relationships of corresponding parameters between ACV model and prototype and between the ice-like material and the real ice are established on the basis of the similarity theory and the differential equation of thin elastic vibrating plate under static or moving load. According to geometric and dynamic similarity between model and prototype, for the conditions of different water depth, ice thickness, mass and velocity of ACV in actual operating mode, the pressure and velocity of ACV model, the elastic modulus and density of ice-like material in model test can be determined, the method of extending the model test results to prototype is proposed.
Use BP Neural Network Set up the Corrosion Prediction Model of Low Temperature Parts of Atmospheric Pressure Device
Authors: Fan Yu Guang , Piao Zai Dong , Chen Bing , Lin Hong Xian , Yang Yang
Published: February 2012

In research of the low temperature parts of atmospheric pressure device, by using BP neural network, the connection of PH value, Cl-, H2S and Fe+2 was setup which can predict Fe+2 content accurately, and obtain the requirement accuracy, hence more accurate corrosion can be predicted and providing more suggests for corrosion protection.
Modelling and Simulation of Maritime UAV-VTOL Robot Flight Control
Authors: Zhao Dong Liang , Anvar Amir M.
Published: February 2012

The Vertical Take-off and Landing (VTOL) Maritime Unmanned Aerial Vehicle (MUAV) has a number of applications including surveillance, search & rescue and real-time communications within a maritime environment. The objectives of this work is to study, research, design and develop, up to implantation, methodologies to apply efficient Command, Control, Navigation and Avionics Scenarios for VTOL-UAV robot operations within maritime air environments. The purpose of this paper is to introduce the overall control system of a five-rotor MUAV and the theoretical analysis of the control system. The controller is derived from the Paparazzi system, which is an open source community hardware and software package for all forms of Unmanned Aerial Vehicles (UAVs).
Ship-Borne Transfer Alignment under Low Maneuver
Authors: Liu Xin , Wang Bo , Deng Zhi Hong , Wang Shun Ting
Published: February 2012

The transfer alignment processes of the ship-borne weapon and the shipboard aircraft are limited by ship0s maneuver, for large ship, it is hope that the transfer alignment can be executed just under the circumstances of sea wave without any intentional ship0s maneuver. Attitude plus angular rate matching and velocity plus attitude matching as the two possible methods which can give accurate estimations of misalignments between MINS and SINS just under swaying maneuver are studied in this paper. Simulation results show that under the circumstance of sea waves and parameters of ships dynamic deformation, attitude plus angular rate matching filter can give better estimations of misalignment angles than velocity plus attitude matching filter. In addition, the estimation accuracy of attitude plus angular rate matching filter is barely affected by sea condition.
Intelligent Condition Monitoring Systems for an AUV Robot
Authors: Anvar Amir Parsa , Garcha Manjit S. , Saliba Ritchie D. , Singh Taranjit M. , Anvar Amir M. , Grainger Steven
Published: February 2012

This paper discuses intelligent techniques used to monitor and correct operational abnormalities in Autonomous Underwater Vehicles. Neural Networks are usually utilised in the diagnosis section, while Fuzzy Logic is implemented in the prognosis and remedy sections. The performance of an AUV’s sub-system has a great affect on the overall success of the vehicle. Once a sub-system becomes faulty, the various components associated with the control of the AUV may get influenced, which can degrade the overall performance of the integrated system or make it invalid altogether, [1]. Such failures may result in large amounts of wasted time, loss of data and increases in mission costs.
A Driver Fatigue Recognition Model Based on Visual Information and Bayesian Network
Authors: Zhang Ming Heng , Gang Long Hui , Zhao Yi Bing
Published: February 2012

Driving fatigue is one of the main reasons of traffic accident. In this field, the method based on multi-source information fusion has been a leading technique. A driver fatigue recognition model based on the Bayesian network was introduced in this paper. The real-time system monitored the state of the driver's features such as eyes, mouth and head movement through computer vision technique, their results were fused with Bayesian network inference algorithm and the final fusion result could be inferred according to the probability values of different variables states. Test results showed that this method could be more reasonably robust, reliable, and accurate in fatigue detection.
Laboratory Test Study on Asphalt Concrete with Steel Slag Aggregates
Authors: Li Wei , Sun Peng Xiang , Zhang Chun Xiao
Published: February 2012

To investigate the validity of steel slag as aggregates in road surface dressing, a series of tests for asphalt concrete mixed with asphalt cement and steel slag aggregates particles are performed using Marshall method. Through the statistical analysis of the test data, and comparison the data with those of asphalt macadam mixture, the asphalt concrete mixed with asphalt cement and steel slag aggregates have very large stiffness, high resistance to deformation and high resistance to cracking. If meeting the requirements of the code in china for asphalt macadam mixture, steel slag can be applied in road surface dressing instead of stone aggregates, but also bring remarkable economic effect and has broad application prospect.
The Warping Defect Control with Tension Leveling in Continuous Galvanizing Line
Authors: Zhang Xiao Feng , Wang Hong Wei , Zhang Qing Dong , Zhou Sui
Published: February 2012

In order to increase market competition, high quality of strip production was demanded. So the quality control of strip was strictly and more active by all the major steelmakers. Today, the device objects of flatness control had extended from tandem mill to subsequent continuous annealing line (CAPL), continuous galvanizing line (CGL), color coating line (CCL) and finishing processing lines, and the types of strip defects researches also have extended from continuous longitudinal waves along lengthwise to warping and composite flatness defect of warping and buckling. In this paper, the simulation model of tension leveling has been established. The effect of bending roll, leveling roll intermesh and strip tension to the distribution of elongation in thickness for strip have been given. Base on this, the analysis model of warping defect of on-line and off-line strip have been built by ABAQUS. On the basis of analyzed the mechanism, proposed measures to reduce the value of cross bow. These measures have been applied in production; the effect of application was obvious.
Synthesis and Antifouling Capability of New Mixture Ratio Coating Containing Methoxysilane Moiety
Authors: Wang Qiang , Yu Zhuan Ni , Yu Liang Min
Published: February 2012

In recent years, high-efficiency and low-toxic antifouling coating are predominant in view of environmental protection and public safety. In this paper, a novel coating containing methoxysilane and acrylic resin were synthesized which have special structure to antifouling. We concluded the colonization of benthic diatoms (Nitzschia flosterium) of the novel coating, taking the antifouling coating containing AM(4.3%w\w）, HD-70 (3.4%w\w），VTMO (2.3%w\w）and Cu2O (28.5%w\w）for instance, we obtained that the colonization of Nitzschia flosterium was 4.3*104N.cm-2. A static test site was set up in Number 8-dock of Qingdao harbor, on the East Coast of China to investigate the antifouling effectiveness of the novel antifouling coating. The results of the present paper demonstrate that the novel coating enhanced the antifouling .
6061 Aluminum Powder Making and its Thermal and Mechanical Properties
Authors: Chen Yi Chuan , Tsao C. Y. A. , Yang Sy Cherng , Hsu Chang Chuan
Published: February 2012

Rapid solidification process was employed to make 6061 Al alloy powder. Powder size distribution was analyzed with SEM. Powder densities, i.e. apparent density and tap density, were measured. Thermal properties were measured via DSC. Surface condition and microstructures and their chemical compositions were characterized with XRD, OM, SEM/EDX. Nanoindentation was employed to obtain the hardness and Young’s modulus of the powders. The relationships among the atomization parameters, powder shapes and sizes, powder densities, thermal properties, microstructures and the mechanical properties were analyzed and rationalized.
Coating of Ti64 Bearings in Air by Using a Q-Sw Laser
Authors: Rozwadowska Justyna , Kida Katsuyuki , Santos Edson Costa , Honda Takashi , Koike Hitonobu , Kashima Yuji , Matsumoto Ryo
Published: February 2012

The influence of surface oxidizing using a Q-sw laser on the wear loss of titanium-4Al-6V (Ti64) alloy during rolling contact fatigue is investigated. Titanium components are widely appreciated for their superb biocompatibility, high strength to weight ratio and corrosion resistance. Due to the above mentioned advantages titanium bearings are a popular choice in applications requiring high strength, light weight, and minimum maintenance (for example, aerospace and defence industries). In these rolling contact applications however issues such as fretting and wear related problems are a common occurrence as the tribological properties of titanium alloys are inferior to those of other metal alloys, such as steel. In an attempt to tackle this problem, a Q-sw laser was used in this work to coat Ti64 bearings with complex titanium oxide layers in a closed chamber without any protective gas. Non-coated and coated samples were tested under water by using a thrust-type rolling contact fatigue machine. The morphology and crystallographic texture of the layers were observed by laser confocal microscope, scanning electron microscope and X-ray diffraction. The wear loss of the coated samples was at least fifty-fold lower than that of the non-coated bearings and a 3-fold increase in the maximum load capacity compared with TiN layers was achieved.
RETRACTED: Epitaxial Growth of Ni-Based Superalloys Using Laser and Spark Deposition
Authors: Santos Edson Costa , Kida Katsuyuki , Rozwadowska Justyna , Kidera M. , Chen Chang Jun
Published: February 2012

Retracted article: In this paper, epitaxial growth on Ni-based single crystals was achieved by using spark deposition and laser powder deposition. Different Ni-based substrates, such as CMSX-4, TMS 138A as well as deposition materials: NiCrAl, Rene N4 and modified 4.5th generation single crystal alloys were used. The deposited layers were analysed by laser confocal microscopy, FEG-SEM, X-ray and electron backscatter diffraction (EBSD), had very little dilution and epitaxial growth was confirmed for the deposits made using Rene N4 electrodes. The deposition time at 100 V voltage, 850 W power and 110 Hz frequency was 3min and the layer thickness varied from 0.3 to 0.5 mm. Cracks were observed in certain areas with the formation of stray grains. In order to investigate the influence of the laser processing during multiple build up, specimens with one and ten layers were manufactured. The total layer thickness on substrates was 0.3 mm and 2 mm, respectively. The processing parameters were: laser power of 500 W, laser beam diameter of 0.6 mm and the z displacement was equal to 80% of the layer height. The laser deposition also resulted in successful epitaxial growth and minimal defects (pores or cracks), however the clads presented high dilution.
Comparison of Temperature Computation Methods for Nozzle in SRM
Authors: Zheng Xiao Ya , Li Peng
Published: February 2012

The precondition of structure integrality analysis for nozzle is temperature computation. Considering the close coupling of flow and heat transfer, thermal conditions should be treated with coupled heat transfer. The paper aimed at a typical nozzle and compared with temperatures using the universal method and the coupled method. The results show that temperature distribution laws on internal wall of two methods are similar, but not exactly the same. The radiation is the major heating form in nozzle inlet and should be considered in temperature computation. The coupled method is more reasonable and convenient to consider radiation and ablation. The coupling of flow, heat transfer，ablation and structure deformation is the development trend for future structure integrality analysis for nozzle in SRM.
Preparation and Characterization of Large-Sized ADM Monocrystals
Authors: Zhang Jun , Guo Yan Hui
Published: February 2012

Non-agglomerated ammonium dimolybdate (ADM) monocrystals with large diameter and high dispersion has been prepared through reaction-evaporation-crystallization (REC) process using ammonium tetramolybdate and ammonia solution as reactants. The as-prepared ADM monocrystals were systematically characterized by x-ray powder diffraction, transmission-reflection optical microscope, Fourier transform infrared spectroscopy and TG-DSC thermal analysis. It is shown that the as-prepared ADM samples are disperse monocrystals with well grain distribution and geometric shape, which can well meet the quality requirements for the subsequent production of molybdenum powders.
Design and Realization of Two-Axis Horizontal Stabilized Platform Based on Self-Correction Control Method
Authors: Qi Chang Song , Pan Hong Jun , Wang Yan Le
Published: February 2012

To enhance the accuracy of stabilization, this paper presents a design of two-axis horizontal stabilization platform system, which is based on the combination of gyroscope and inclinometer sensors. The self-correction control method is put forward to solve the system error caused by gyroscope zero drift in traditional gyro stabilized platform, which works in the way of revising the gyroscope zero coefficient, according to the real-time attitude information feed backed by inclinometer sensors fixed in objective platform.
An Investigation of Thin Film Coating for Evaluation Friction Coefficient Using Ring Compression Test
Authors: Lawanwong Komgrit
Published: February 2012

This research aims to investigate the types of thin film coating for the evaluation of coefficient of friction using ring compression test. Ring compression test was used to evaluate the coefficient of friction of contact between die coating surface and workpiece material, brass grade C3771. Specimen was machined by CNC to the standard size with ratio of the outer diameter [25.4mm] to inner diameter [12.7mm] and thickness [8.5 mm] is 6:3:2. The dies were made from tool steel grade JIS SKD11 hardened to 60±2HRC then polished die surface at Ra= 0:07 to0:09 microns. Tool surface conditions selected for this research were non-coated, PVD coated DLC, AlCrN, TiCN and TiAlN.The Experiments were carried without lubricant. Experiments were reduced height of the specimen at 50 percent. It was found that Non coated condition had shown lower coefficient of friction than DLC, AlCrN, TiAlN and TiCN due to influence of surface roughness. Furthermore, thin film coated die had shown durable and high resistance scratch of die surface more than non coated die.
Study on Integration Architecture of Product Design and Manufacturing Based on Knowledge Engineering
Authors: Zhang Peng , Xue Xiao Wei , Li Zhao Lin
Published: February 2012

The paper analyses problems existing in integration models of product design and manufacturing in enterprises. Under the theory of product life cycle management (PLM) and via the platform of J2EE, it builds a framework for establishment of integration architecture in product design and manufacturing based on knowledge engineering. The paper gives a detailed introduction to the structure, function characteristics and realization forms of the architecture. On the basis of this, the paper then studies integration methods of the information system based on XML and explores key technologies in the knowledge base plus network safety of the architecture. Finally, the paper emphatically analyzes types of flow of traditional knowledge and digital knowledge in enterprise knowledge management. The proposed architecture has realized close integration of various sectors so that knowledge runs through the whole process of product life cycle. As a result, the architecture can satisfy modern enterprises’ demand for collaborative manufacturing, resource sharing and network integration while supporting knowledge management and technological innovation.
Research on Feature Edge Detection Method of Large-Size Components Based on Machine Vision
Authors: Lu Qian , Ge You Hua , Cui Zhi
Published: February 2012

Aiming at the problems that existed in the actual application of traditional measurement methods for large-size components, the size measurement and detection method of large-size components based on machine vision was researched and discussed, and the imaging model was built, of which on the basis, the feature edge detection method was applied into the large-size components measurement, thus the image stitching algorithm based on feature edge detection was pointed out, and after simulation, the simulation result shows that the image stitching algorithm based on feature edge detection has good real-time performance compared with the traditional corner detection stitching algorithm, and the former has better accuracy than that of the latter. So the image stitching algorithm based on feature edge detection could enhance the accuracy and efficiency by taking use of large-size components measurement based on machine vision, and it is significative for enhancing the application level of large-size components measurement based on machine vision.
Influence of Cooling Rate on the Microstructures and Properties of a Nb-Ti-Mo Steel
Authors: Yi Hai Long , Xu Yang , Liu Zhen Yu , Wang Guo Dong
Published: February 2012

A Nb-Ti-Mo high strength steel was selected at two different cooling rates through ultra-fast cooling process, and its microstructures and strengthening mechanisms were analyzed. The results show the size of ferrite was decreased and the amount of bainite and micro-hardness were increased with increasing of cooling rate through thermal simulation. The UFC technology can improve the yield and tensile strength 25MPa and 35MPa, respectively, compared with conventional TMCP. The microstructure of this steel is mainly ferrite and good strength and toughness are caused by the refinement of ferrite and fine precipitates. Ultra-fast cooling technology improves the strength and toughness of this steel effectively.
Structure of Mold Surface for Stress Relaxation Forming of Integral Panel of 2124 Aluminum Alloy
Authors: Gan Zhong , Wu Yu Ping , Zhu Jia Zan , Tan Hai Bing
Published: February 2012

This paper proposed a method and process of stress relaxation forming based on initial geometric springback compensation-finite element optimization-revision by experiment iteration. Obtained material parameters of 2124 aluminum alloy by a series of foundation craft experiments; springback law on the structure of 2124 aluminum alloy by foundation experiment of autoclave forming of T test specimens, that use to compensate the mold surface with the geometric springback. The precision of the geometric springback compensation of the mold surface is about 3 mm; while after the finite element iteration optimization on the mold surface with the initial geometric springback compensation, the deviation of that between the testing date and the theory appearance of specimens can reach the magnitude about ±1.2 mm. Next use the mold “frequency domain” revision algorithm based on experiment iteration to revise local mold surface of the stress relaxation forming. The testing date shows the precision control in ±0.5 mm that satisfied with the application of engineering.
Fatigue Properties of the Cell 3D Composite Structure
Authors: Růžička Milan , Had Jiří , Uher Ondřej
Published: February 2012

A novel type of hybrid cell composite structure has been developed, experimentally investigated and used for many practical applications. The cell system can fill relatively thick parts of cross sections of beams with lower risk of shear stress damage and cracks between uniaxial oriented fibres. Typical macroscopic sub-cells in the cross section structure are formed by the stamping process of partially cured and axially-oriented high modulus carbon fibre bundles (about 4-6 mm in the diameter), which are wrapped around by a thin layer of high strength fibres (oriented in ±45 or 89 degrees). An advantage of this final 3D cell composite structure is its higher static and fatigue strength and shear stiffness in comparison with thick unidirectional composite parts. Static, fatigue and residual static strength was experimentally investigated for 1D unidirectional as well as for 3D cell structure under four point bending loading on specimens with the rectangular cross section. The 3D structure shows much better static and fatigue properties as the thick 1D unidirectional structure.
Bending and Fracture Properties of Small Scale Elastic Beams – A Nonlocal Analysis
Authors: Li Xiang Fang , Wang Bao Lin
Published: February 2012

Using the nonlocal elasticity theory, this paper presents a static analysis of a microbeam according to the Timoshenko beam model. A fourth-order governing differential equation is derived and a general solution is suggested. For a cantilever beam at nanoscale subjected to uniform distributed loading, explicit expressions for deflection, rotation and strain energy are obtained. The nonlocal effect decreases the deflection and maximum stress distribution. With a double cantilever beam model, the strain energy release rate of a cracked beam is evaluated, and the results obtained show that the strain energy release rate is decreased (hence an increased apparent fracture toughness is measured) when the beam thickness is several times the material characteristic length. However, in the absence of a uniformly distributed loading, the nonlocal beam theory fails to account for the size-dependent properties for static analysis. Particularly, the nonlocal Euler-Bernoulli beam can be analytically obtained from the nonlocal Timoshenko beam if the apparent shear modulus is sufficiently large.
Failure Analysis and Life Prediction of Coatings for Gas Turbines
Authors: Che Chang , Zhang Qiang , Duan Fang Miao , Zhang Tao , Jiang Hong De
Published: February 2012

The integrity of coatings used on the surface of blades of gas turbines determines the reliability of the blades. Coatings life usually dictates blades refurbishment intervals. The failure investigation and life assessment of coatings are essential for the effective management of blades. In this paper, coatings failure mechanisms are investigated by examination of service-exposed blades, and a methodology of coatings life assessment is described.
Analysis and Simulation of Air Drag in Vehicles Close-Following
Authors: Zhang Juan , Li Zuo Jun , Bai Bin , Zhang Lei
Published: February 2012

Vehicles drag reductions arising from close spacing are studied and verified by some research institutes. But this solution was queried by an experiment carried in RMIT University in 2006. Based on two standard Ahmed Bodies, Computational Fluid Dynamics(CFD) method is used to study this problem in this paper. The calculation results by comparing four different CFD turbulence models show that the drag coefficient of the rear car is more than the lead car, and even more than the isolated car when the space of these two cars is less than one time of car length. Furthermore, the calculate results of these four turbulence models show that the standard model is the best model to simulate this problem, and different far field condition will influence the calculate results much more. Therefore, the research of this paper verifies that drag reductions from close spacing still need to be studied.
Study of Intelligence Virtual Maintenance Training System Base on STEP Standard
Authors: Wang Feng Chan , Sun You Chao , Zhao Chen Yang
Published: February 2012

Overall scheme for large-aircraft Intelligence Virtual Maintenance Training System (IVMTS) information model which integrates the Standard for the Exchange of Product model data (STEP) standard geometric model with agent model is presented in this paper. Firstly, the system multi-agent model architecture are constructed. Secondly, Integrated STEP standard geometric model with agent model and maintenance applying information, the maintenance object agent IP(intelligence part) ,IB(intelligence body) and IT(intelligence tool) are constructed utilizing the EPRESS-G language. Thirdly, the communication method between components and system level agents is presented based on Blackboard model each other. Finally, how to realize the model under catia-caa secondary development method is described, and the intelligence maintenance process simulation, maintenance of the elements of the intelligent interaction, intelligence collision detection and maintenance sequence optimization simulation can be realized in this method in IVMTS.
Driving Force Guaranteed Cost Control Method for Independent Four Wheels-Drive Electric Vehicle
Authors: Yu Fu Ying , Ma Lei , Li Jin Shuai
Published: February 2012

As energy shortages in recent years, pollution-free cars are urgent needed, so electric cars become engineering research focus. Dynamics of vehicle with four independently-driving wheels is analyzed to show the purpose of vehicle running control. Dynamic response model of driving system is obtained through system identification, and then be transformed into a control model of driving system. The whole vehicle control method is designed, guaranteed cost control theory is used to design system feedback controller. The equality torque driving force distribution strategy is applied in experiment, and this method has achieved good results.
Lay-Up Effects on the Dynamic Instability of Moderately Thick Stiffened Curved Panels
Authors: Ovesy Hamid Reza , Fazilati Jamshid
Published: February 2012

The dynamic instability of cylindrical shell panels having longitudinal stiffener is studied by using the developed finite strip method (FSM). The method is formulated using the third order shear deformation shell's theory of Reddy's form and the Koiter-Sanders theory for cylindrical shells is implemented. The lay-up effects of skin as well as the stiffener are investigated.
Numerical Simulation of the Flow Field for Rotor Ventilation System of Large-Scale Nuclear Power Turbo-Generator
Authors: Zhang Xiao Hu , Hu Lei , Yuan Jian Hua , Yuan Yi Chao
Published: February 2012

The nuclear power turbo-generator with large capacity is a basic unit of nuclear power plant, while the cooling technology becomes one of the key issues which affect its design and operation deeply. Axial-radial ventilation structure for rotor is commonly used in large nuclear power generator. In this article, according to the basic principles of computational fluid dynamics (CFD), ventilation’s structure and performance is analyzed, 3D flow model is also established. After the boundary conditions are determined, the numerical calculation and analysis is finished. And then, the rules of flow distribution is obtained, the flow field and the static pressure character of the gap is also computed, which could be very important to the ventilation system of the whole generator.
Applications of CAD in the Modern Garment Industry
Authors: Cheng Wei , Cheng Zhi Li
Published: February 2012

In recent years, the Computer Aided Design (CAD) technology is being utilized in the textile and clothing industry, thus simplifying the overall process and shortening the cycle from design to manufacturing. This greatly improves the manufacturing efficiency and also the garment quality. This paper presents the trend of 3D Garment CAD technology, analyzes the intelligent apparel CAD systems, including parametric design, Combination of artificial intelligence and CAD and the closely relationship between CAD and the Internet.
Contribution to the Study of a Flow Controlled by a Synthetic Jet
Authors: Benhegouga Islem , Boukehili Adel
Published: February 2012

Active control of flow over a cylinder at Re=1800, based on the free-stream velocity U∞=0.67m/s, and cylinder diameter d=40mm, is carried out using a synthetic jet. The slot injectors are positioned at θinj = ± 70°. An actuator was used to produce a synthetic jet by exciting a cavity with an alternative piston system. The results show that for the frequency of control located around the natural frequency of the vortex emission a phenomenon of lock-in appear.
Workspace Analysis and Dimensional Synthesis on a Delta Parallel Mechanism with Branch Chain Offset
Authors: Huang Chen Chen , Shen Lin Yong , Qian Jin Wu , Zhang Yan An
Published: February 2012

In this paper, we intend to design a force-feedback device that meets the requirements in workspace. First, based on the modified Delta mechanism, we introduced a chain offset angle that is defined as alpha. We established the positive and inverse kinematics model by the vector method. According to the inverse kinematics formula, envelope body equation of single-open-chain subspace was deduced. We drew the geometric shape of the subspace under three situations while L1 was more than or equal to or less than L2. Then the influence of alpha on the whole workspace and mechanism size is deeply discussed. The cross section view of the space was also plotted by MATLAB. Finally, we gave an example using the Jacobin matrix condition number as the mechanism performance index for dimensional synthesis. The results show that the workspace meets the requirements well.
Design, Modelling and Simulation of Maritime UAV-VTOL Flight Dynamics
Authors: Cao Jun , Anvar Amir M.
Published: February 2012

An Unmanned Aerial Vehicle (UAV) is referred to as a remotely piloted aircraft or an unmanned aircraft which can be navigated with human operator in the loop. This paper discusses the design of a UAV with Vertical Take-Off and Landing (VTOL) capability for Maritime applications. The design provides a means for surveillance and communication in Maritime applications. The VTOL-UAV utilises a five-rotor propulsion system that can be launched from confined platforms such as ship-decks. The intended applications of this M-UAV drove the development of an innovative landing system which in the case of emergencies can allow the M-UAV’s soft and potential landing on the water surface. The other functionalities of this UAV are its capabilities to deploy communication Micro-sonobuoys which allows for communication with underwater Robot(s) via Operator in the loop. In this paper we also discuss the process of structural design modelling and evaluation of the development of the Maritime Unmanned Air Vehicle.
A New Morphological Method for Faults Diagnosis of Rolling Element Bearings
Authors: Dong Ya Bin , Liao Ming Fu , Zhang Xiao Long , He Yu Min
Published: February 2012

A new morphology analysis method had been proposed to effectively extract the impulse components in the vibration signals of defective rolling element bearings. In the method, the morphology operator had been constructed by average of the closing and opening operator. For the construction of structure element (SE), the flat and zero was adopted as the shape and the height of SE, respectively, and the element numbers of the SE was optimized by a new proposed criterion (called SNR criterion). Vibration signals of two defective rolling bearings with an outer and an inner fault respectively are employed to validate the proposed method and the results are compared with ones calculated by envelopment analysis method. It shows that the proposed method is effective and robust to extract morphological features, and can be used to the on-line diagnostics of rolling element bearings in rotating machines conveniently.
Compressor Surge Detection Based on Support Vector Data Description
Authors: Li Chang Zheng , Lei Yong
Published: February 2012

Axial flow compressors work as an indispensable device in industry fields. Surge is a phenomenon of aerodynamic instability, which characterized by disruption of flow. When a compressor works in surge state, the vibration is so intense that it may causes accidents. Detecting surge timely and accurately not only insure safety of compressors but also is a key of active control of aerodynamic instability. Support vector data description (SVDD) is a one-class classification method developed based on the theory of support vector machine (SVM). In this paper, we introduce SVDD into the field of compressor surge detection. It demonstrates that SVDD method can give a warning far ahead of surge.
The Dynamic Analysis of Multibody Systems with Uncertain Parameters Using Interval Method
Authors: Wu Jing Lai , Zhang Yun Qing
Published: February 2012

The theoretical and computational aspects of interval methodology based on Chebyshev polynomials for modeling multibody dynamic systems in the presence of parametric uncertainties are proposed, where the uncertain parameters are modeled by uncertain-but-bounded interval variables which only need the bounds of uncertain parameters, not necessarily knowing the probabilistic distribution. The Chebyshev inclusion function which employs the truncated Chevbyshev series expansion to approximate the original function is proposed. Based on Chebyshev inclusion function, the algorithm for solving the nonlinear equations with interval parameters is proposed. Combining the HHT-I3 method, this algorithm is used to calculate the multibody systems dynamic response which is governed by differential algebraic equations (DAEs). A numerical example that is a slider-crank with uncertain parameters is presented, which shows that the novel methodology can control the overestimation effectively and is computationally faster than the scanning method.
Optimal Design of Biomass Molding Machine
Authors: Li Jian Gang , Wang Ji Rong , Li Jun , Wang Yuan Yuan , Chen Yi Lei
Published: February 2012

In order to enhance productivity of the biomass press molding machine, some structure improvement designs are made based on the revolving molding machine. Using the optimization theory to model with the parameters of the improved machine when the input power is constant, the optimization result of the model is obtained using MATLAB software. The results show that producing time of the improved machine can reduce 28% compared with the revolving molding machine.
Research on the Roll Contour Configuration for Schedule Free Rolling in Hot Wide Strip Mills
Authors: Mi Kai Fu , Zhang Jie , Cao Jian Guo , Li Hong Bo , Cheng Fang Wu , Hu Wei Dong
Published: February 2012

In order to satisfy the flexible rolling schedule of hot steel production, principles and theory for choice of roll contour configuration were described. Additionally, the several typical roll contour configurations which are popular in the world nowadays, and their shape control capability for “rolling of large quantities of strips in same width” and “rolling by strip width increase in sequence” were analyzed with established finite element model of roll stacks. Then, the optimum roll contour configuration for SFR (schedule free rolling) was obtained.
Design of Planetary Gear Reducer with Double Circular-Arc Helical Gear
Authors: Wang Chin Yu
Published: February 2012

The two gears of the double circular-arc helical gear is a mesh of a concave/convex combination. Because the curvature is close to each other, the strength also increased and thus, it is often used in heavily-loaded workplaces. The national standard for double circular-arc helical gear (ex., GB12759-91) is based on the size of the gear module to design its tooth profile. This shows that tooth geometric-related designs are quite complicated. If the effect of the different pressure angle parameter is considered, we would be unable to conduct relevant studies for the original standard formula with a double circular-arc helical gear set at a pressure angle of 24°. Firstly, this paper would redefine a new double circular-arc helical gear according to the discontinuousness tooth profile molded line of the double circular-arc helical gear and unchangeable pressure angle and explain the improvements in the design and stress analysis of the tooth especially since the double circular-arc helical gear has no limitation in the minimum number of teeth. Thus, the decrease in the driving gears’ number of module and can further increase the reduction gear ratio. For heavily-loaded planetary gear reducer, it’s quite obvious in the miniaturizing and high torque superiority. This paper also used certain winch’s speed reducer as example to explain that the change of the pressure angle can reduce contact stress by 3%~40% and also enhances the torque ability by 3%~40%.
Dynamic Analysis and Design Method Study on the Combined-Boom System of Portal Crane
Authors: Sun Yuan Tao , Li Duan
Published: February 2012

As a main handling device the portal crane is widely used in port, railroad, etc.The crane handling procedure is mainly carried out through its combined-boom system luffing or swing .In general, in order to reduce drive power and improve the operational performance, the luffing trajectory should meet the design requirement. At the same time, structure stress should be secured in the whole process of handling the cargo. Recently, to deal with more heaver and further cargo, the portal crane is becoming more large-scale. So that the large-scale components such as jib elastic deformation effect on large displacement motion cannot be ignored longer. In addition to the structure high speed motion in the process of handling also make the structure dynamic behaviors spending more obvious specially in the condition of luffing combined with swing. However, the problem for this dynamic behavior brings about to physical design sometimes has no method to solve according to the conventional analysis algorithm and dynamics method. To reduce the deviation caused by the common analysis, design and analysis method based on the multibody is put forward in this thesis. According to the method, the result on the luffing trajectory and stress-time history are analyzed easily. So that it ensure the efficiency and increase the accuracy of the initial design according to the conventional design and analysis method.
A Study of the Effect of Ship Size on Components Selection for an LNG Carrier
Authors: Md Redzuan Zoolfakar , Rose Norman , Ehsan Mesbahi
Published: February 2012

The primary aim of any business is to maximise profit for a given level of effort. This is equally true for liquefied natural gas (LNG) transportation in which any possible reduction in capital and operational costs will attract the attention of the ship-owner. The main strategy for achieving this is to select the optimal combination of the main components of the vessel based on a given objective. There are no fixed regulations or formulae that need to be applied in selecting the combination of components; however several techniques have been developed over the years to assist with the process of ship design, such as the ship design spiral. The decision making processes for the selection of these main components need to be implemented at a preliminary stage because once these main components have been identified, the overall costs will be established and will be constrained over the ship’s life span. Modifications may be made to the selected components at a later stage, however this would come at a considerable cost and would incur significant programme delay because it is not simply a matter of buying a new component, it may also involve a significant re-arrangement of the ship’s layout in order to accommodate the new component. This would therefore, require the ship owner to fund both additional capital costs as well as the ongoing operational costs. This paper focuses on the effect of ship size on the selection of components for an LNG carrier.
Design of ZrO2/Ti Functionally Graded Thermal Barreir Coatings Based on a Nonlinear Micromechanical Approarch
Authors: Tsukamoto Hideaki , Sato Hisashi , Watanabe Yoshimi
Published: February 2012

This study presents a design process of ZrO2/Ti functionally graded thermal barrier coatings (FG TBCs) based on a mean-field nonlinear micromechanical approach developed by Tsukamoto [1], which takes into account the time-independent and dependent inelastic deformation, such as plasticity of metals, creep of metals and ceramics, and diffusional mass flow at the ceramic/metal interface. The effect of compositional gradations on micro-stress states in the FG TBCs has been examined. The suitable compositional gradations have been proposed for typical thermo-mechanical boundary conditions in terms of thermal-stress relaxations, thermal-shielding and light-weight characteristics.
Optimization of the Raw Part Shape for the “Fork” Production by Computer Simulation
Authors: Kostalova Miroslava , Kapustova Maria
Published: February 2012

The article showed procedure of forging technological flow design modification of real component “fork”, with using of computer simulation. By using of the primary technological process at production was produced failure forgings, checking simulation showed incorrect material flow in filling of die cavity, and therefore it was needed to raw part design modifications. These modifications were suggested on base results obtained from simulation, the results were abolition of defects, resolution of problem and correctness verification of final forging technological flow.
A Warehouse Management System for 3 Dimensional Tracking and Positioning
Authors: Leong W.Y. , Ee James
Published: February 2012

A warehouse management system using the three-dimensional location tracking and positioning system based on time-of-flight principle is presented in this paper. Integrating three distance measurement sensors and computer programming to process the signals obtained from the sensors, the system can capture, store, and retrieve the three-dimensional position of steel coils located in a warehouse in real time. Updated information will also be stored in a database as a backup. Experiment shows that the system designed in this paper has the merits of real-time tracking of steel coils stored in a warehouse, or any uniformed storage locations.
Radioactive Research on Main Steam Pipe Rupture Accident of Nuclear-Powered Equipment of Ship
Authors: Wang Wei , Zhang Fan , Chen Li Sheng
Published: February 2012

Respectively considering both the condition of the main steam pipe rupture position at the reactor cabin and cabin behind the reactor cabin, the accident process of the main steam pipe rupture is analyzed, the mathematic and physical model about the transference, leakage and diffusion of the radioactive nuclide is established. Through the method of coupling the thermodynamic calculation result with the radioactive result analysis model, the calculation of the nuclide radioactive concentration in the cabin is realized. Further more the harm of the radioactivity has been analyzed. The research of the paper has provided a basis for the effective constitute of the radioprotection measure in the accident.
Research on Coordinated Control of the Vehicle Chassis System Based on a Hybrid Model
Authors: Chen Wu Wei , Zhao Lin Feng , Yang Jun , Zhu Hui
Published: February 2012

Based on the analysis of the movement relationship among systems such as the chassis suspension and the steering and braking system, simulation and testing are carried out on control system of the vehicle chassis system with a coordinated control method of the hybrid model. For the complex vehicle chassis system, modeling and simulation focuses on the movement effects of the three subsystems, classifying complex under different conditions by control methods and testing control parameters separately. Based on the simulation results of the vehicle and the parameters of the controllers, software & hardware systems of the vehicle are designed, and the tests of the vehicle chassis system are carried out based on the hybrid model. The results indicate that under complicated conditions, control systems with the hybrid model can effectively improve the ride comfort, handling, and security.
An Encryption Algorithm
Authors: Dastgheib Amir Mohammad
Published: February 2012

Nowadays the information security is one of the fundamental and important issues in information management. Utilizing a collection of policies, solution, tools, hardware and software is for the purpose of obtaining an environment in which the information is not threatened while being produced, refined, transferred and distributed. Obtaining such an environment entails doing some things which are called security requirement. Therefore, for meeting those requirements in this project a symmetrical encryption algorithm has been designed and performed.