bluuebunny/crossref_metadata_2025 huggingface dataset:
The Study on Influencing Factors of Dense Paste’s Resistance Characteristic
Authors: Gao Jie , Wang Liang , Jia Xuan Kai , Zhang Shuang Yu , Wu Miao
Published: June 2012

This paper analyses the reasons and influencing factors of resistance during the pipe transportation of dense paste. Taking coal slime for example, the experiment is conducted on pressure pipe rheological and resistance characteristics test system. It studies how three key factors (the concentration, flow rate, and diameter) influence the dense paste's transportation resistance loss. The test indicates the linear relationship between transportation resistance loss with average flow rate, the power law relationship with pipe diameter, and the exponential relationship with volume concentration. This study provides test foundation and analytical method for establishing a typical dense paste pipe transportation resistance loss computation model.
Volume - Variable Mold with Multi - Circular Arc Cavity and its Optimal Design
Authors: Song Jin Ling
Published: June 2012

Aiming at optimal design of the hardcore of meat skewering equipment — material forming mold and object-carrying table, the author insights into the stress deformation regularity of soft and solid material with compression test for fresh lean pork based on the analysis of fundamental feature of soft solid material and macroscopical observation of changes in form under different pressures. Through the algorithm of Dichotomy Method with which four tangent sections of arc are connected to fit ellipse, a mathematical mold is constructed to fit the area difference and to optimize the solution with parameters of surface which is consisted of multiple tangent sections of arcs and AutoCAD to ensure the correctness through drawing the surface diagram for the detailed parameters of the cavity.
A Mechanics Model and Active Control for Smart Constrained Layer Damping Structure
Authors: Cao You Qiang , Deng Zhao Xiang , Wang Pan
Published: June 2012

The active vibration control of beam is researched by using piezoelectric constrained damping structure. The energy characteristic of each layer for the piezoelectric smart constrained damping beam is completely expressed based on the finite element method and the damping layer shearing movement relationship is described by ADF model. Then the structure mechanics model for dynamic parameters is established. Applying displacement error signal, an adaptive filter controller is designed. Under the different outside disturbance, structure vibration responses with active control are analyzed. It shows that the piezoelectric smart constrained damping structure can have good control performance for the active and it has a good engineering prospects.
The Effect of Accumulator Volume and Inflation Pressure on Tracked Vehicle Braking System
Authors: Sheng Long Bo , Ma Ji Sheng , Sun He Yang , Li Tao
Published: June 2012

Based on the braking system of a tracked vehicle, a method for co-simulation is introduced with dynamic simulation software ADAMS and multidisciplinary dynamic simulation software EASY5. By designing software interface, dynamic data exchange between the two models is achieved, and the simulation is carried out about the impact on a tracked vehicle brake performance with accumulator volume and gas-filled pressure. The simulation result shows that a seamless connection between the virtual prototype model and hydraulic system model is realized.
Strength Reliability and Parameter Sensitivity Analysis of a Missile Airfoil Structure
Authors: Liu Zhi Qun , Zhou Hong , Chen Zheng Bian
Published: June 2012

Abstract. In this paper, the strength reliability and parameter sensitivity analysis of a missile airfoil structure are researched. For checking strength of the missile airfoil structure before reliability analysis, stress distribution is analyzed by MSC.Nastran. Owing to the fact that machining deviation and design tolerance result in size dispersion, thickness of missile airfoil skin, thickness of ribs, length of airfoil and length of fork are considered as random variables. Based on certain analysis, the strength reliability and parameter sensitivity of the missile airfoil structure are analyzed by the fourth moment method. The reliability analysis illustrates that the strength failure probability of the missile airfoil structure is 0.01286 and the results of sensitivity reveal that the thickness of ribs is the main factor which influence on the strength reliability of airfoil structure.
Synchronization of a Class of Chaotic and Hyperchaotic Systems via a Simple Universal Control Method
Authors: Liu Zhi , Hao Ming Ju
Published: June 2012

This paper investigates the synchronization of chaotic and hyperchaotic systems, and proposes a simple and universal method for chaos synchronization through investigating the dynamical behavior of the chaotic error system. In comparison with previous methods, the present controllers are simpler than the existing results. Especially, for some class of three dimensional chaotic systems, the obtained controllers in this paper contain single state feedback. Numerical simulations verify the effectiveness and correctness of the proposed method.
Calculation of Rigid-Body Motion of Integrated Raft Isolation System
Authors: Lv Zhi Qiang , Xu Wei , Shuai Chang Geng
Published: June 2012

Integrated raft isolation system (IRIS) has some advantages over raft system of much smaller scale, such as higher isolation efficiency, less use of elastic couplings, etc. But the calculation of IRIS’s dynamic characteristics is complex. Finite element method usually adopted by raft designers is inefficient due to the iterative nature of design process. In this paper a six-degree-of-freedom rigid-body motion model is presented to calculate the static，quasi-static and rigid-body mode behavior of IRIS. The model is especially suitable to compare different design schemes and select out feasible ones efficiently at the initial design stage of IRIS.
Effect of Particle Size on the Lamellar Pore Microstructure of Porous Al2O3 Ceramics Fabricated by the Unidirectional Freezing
Authors: Zhang Xiao Yong , Zhang Yan , Zhang Dou
Published: June 2012

Porous Al2O3 ceramics with a lamellar pore microstructure have been fabricated by a directional freezing process using the micro-sized and nano-sized Al2O3 powders. At the same solid loading and freezing temperature, compared with the suspensions of micro-sized Al2O3, the porous ceramics prepared from the suspensions of nano-sized Al2O3 had the narrower lamellar pore channels and thicker channel walls, which were caused by the higher viscosity, stronger inter-particle attraction and more ice nucleation sites in the nano-sized Al2O3 suspensions. For both types of Al2O3 at a specific solid loading, with the increasing of freezing temperature, the wider pore channels and thinner channel walls were observed. These tendencies were weaker by using the nano-sized Al2O3 . The above results show the lower porosity in the ceramics using the nano-sized Al2O3. However, due to the higher sintering activity for the smaller particles, the pore channel walls by using the nano-sized Al2O3 was denser than using the micro-sized Al2O3, leading to the higher mechanical strength of ceramics.
Effect of Precursor on Sonochemical Synthesis of PbWO4 Crystals
Authors: Wang Yong Gang , Lin Hai Yan , Zhang Xiao Qian , Yang Lin Lin , Wang Yu Jiang , Wang Xiao Feng
Published: June 2012

A sonochemical method has been applied to prepared PbWO4 crystals by using different precursors. The as-prepared samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the precursor played an important role in the synthesis of PbWO4 crystals. PbWO4 nanostructures with different morphologies, such as flower-like, rod-like, and dendrite-like, have been successfully obtained via a mild sonochemical method corresponding to the precursor PbCO3, Pb(NO3)2, and Pb(Ac)2, respectively.
Effect of Thermomechanical Treatment on Mechanical Behaviour and Microstructure of Low Alloy Steel
Authors: Tash Mahmoud M.
Published: June 2012

The present study was undertaken to investigate the effect of thermo-mechanical treatment (TMT) on the microstructure and mechanical behaviour of low alloy steel. Hot forging is carried out at 1200°C using mechanical press of 500 and 800 ton. The effect of hot forging reduction ratios (1.11 and 1.29) on the hardness and mechanical properties are studied. TMT samples are given different heat treatment i.e. annealing (A), normalizing (N), hardening (H), hardening and tempering (H/T) and their corresponding impact toughness are obtained. Selected heat treatment (normalizing and annealing) are given to tensile test samples and their corresponding strength and ductility are obtained. Ultimate tensile, 0.2% offset yield strength and percent elongation are measured. Hardness and impact toughness measurements were carried out for all alloy conditions. Hardness (HV), ultimate tensile stress (UTS-MPa) and 0.2% offset yield stress (MPa) increases with increasing reduction ratio. TMT leads to a sharp rise in alloy hardness and strength. Normalizing and annealing following TMT revealed a low hardness values compared to those observed in the TMT condition. Annealing reduces hardness and strength but increases ductility and impact toughness. This could be attributed to the recovery and coarsening effect. Pro-eutectoid ferrite phase are observed along the grain boundaries of low alloy steel in the TMT conditions regardless of the reduction ratios. Normalized samples show a refined pearlitic microstructure while coarse pearlite is observed in the annealed one. Good mechanical properties can be obtained by a combination of plastic deformation and thermal treatment. Heat treatment is one of the major factors used to enhance the mechanical properties of low alloy steel. An understanding of the combined effect of TMT and subsequent heat treatment on the structure and mechanical properties of low alloy steel would help in selecting conditions required to achieve the optimum mechanical properties and alloy high strength to weight ratio. This may be achieved by measuring hardness, impact toughness, strength and ductility resulting from different heat treatment following TMT.
Effect of WC Contents on Microstructure and Properties of Steel-Bonded Cemented Carbide
Authors: Luo Jun Ming , Xu Ji Lin , Wei Zheng
Published: June 2012

WC steel-bonded cemented carbides were prepared by microwave sintering through ball milling, press forming and sintering with iron powders as the matrix, WC particles as the reinforcements. The effect of WC contents on microstructure and properties of steel-bonded cemented carbide was studied. The results show that the steel-bonded cemented carbide sintered at 1280 °C is considered as a liquid phase sintering and Fe7W6, Fe2W2C and Fe6W6C new phases are generated during the sintering process. The relative density, microhardness and bending strength of the steel-bonded cemented carbide increase with increasing the WC contents. Moreover, the mechanical properties of steel-bonded cemented carbide are obviously improved after heat treatment.
Effects of Process Conditions on Crack Healing in 30Cr2Ni4MoV Steel during Hot Forging
Authors: Zhang Xiao Xun , Lin Tuo , Zhu Shuang Shuang , Zhang Sheng Ling , Wang Zhen , Ha Lei
Published: June 2012

Internal cracks in 30Cr2Ni4MoV steel were produced by compressing cylindrical sample with drilled hole. In order to consider the effects of deformation degree, temperature, strain rate and holding time on the crack healing, the hot compression tests were performed on Gleeble-1500 thermo-simulation machine under different process conditions. By in situ observation under optical microscope and scanning electron microscope, effects of process condition on crack healing and the behaviours of crack healing were revealed successfully: (1) the result of crack healing improves as the melt temperature, reduction and holding time increase, (2) the effect of crack healing decreases as the strain rate increases. By the energy dispersive spectroscopy, it is also found that the chemical composition of the healed crack area is different from that of the matrix.
A Study of the Optical Properties of Triazene-Cinnamic Acid Polymeric Fluorescent Brighteners
Authors: Liu Jing
Published: June 2012

Series of the triazene-cinnamic acid polymeric fluorescent brighteners were synthesized through three-step condensation reactions and polymerization reaction with styrene under replacing one of amino compounds of traditional fluorescent brighteners by cinnamic acid. The optical properties in aqueous solutions and N,N’- dimethyl formamide as well as paper coating application test were evaluated. The results showed that the light stability and fluorescence quantum yield of polymeric fluorescent brighteners was improved obviously and photoinduced isomerization was lower. Meanwhile the optical properties of polymeric fluorescent brightener were affected by concentration and solvent polarity, fluorescence quantum yield increasing and hypochromatic shift of fluorescence emmission wavelength with the decrease of solvent polarity. When the concentration was over 1 10-4 g/mL, the fluorescence was quenched.
A Technology for Producing Hot Rolled Product of Cold Heading Steel
Authors: Li Zhuang , Wu Di , Lv Wei
Published: June 2012

In the present paper, thermomechanical controlled processing (TMCP) of low carbon cold heading steel was conducted by a laboratory hot rolling mill. The results have shown that the mechanical properties of the low carbon cold heading steel can be significantly improved by TMCP without heat treatment. The enhancement of the mechanical properties for the low carbon cold heading steel is attributed mainly to the finer ferrite grain size, and it is also related to the remaining dislocations within substructure of the cold heading steel after deformation. A technology is developed for producing hot rolled product of cold heading steel with improved mechanical properties. The technology has great significance because processing flow is simplified, and manufacture cost is decreased.
Ameliorated Hydrogen Storage Kinetics of Mg20Ni7M3 (M=Co, Cu) Alloys by Melt Spinning
Authors: Zhang Yang Huan , Hou Zhong Hui , Chen Li Cui , Yang Tai , Shang Hong Wei , Zhao Dong Liang
Published: June 2012

In order to obtain a nanocrystalline and amorphous structure in the Mg2Ni-type alloy, the melt spinning was applied to fabricate the Mg20Ni7M3 (M=Co, Cu) hydrogen storage alloys. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The effects of the melt spinning on the gaseous and electrochemical hydrogen storage kinetics of the alloys were investigated. The results indicate that the as-spun (M=Co) alloys display a nanocrystalline and amorphous structure as spinning rate grows to 20 m/s, while the as-spun (M=Cu) alloys hold an entire nanocrystalline structure even if a limited spinning rate is applied, suggesting that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The melt spinning remarkably ameliorates the gaseous hydriding and dehydriding kinetics of the alloys. The hydrogen absorption ratio ( ) and hydrogen desorption ratio ( ) are enhanced from 81.9% to 94.7% and from 34.9% to 57.3% for the (M=Co) alloy, and from 57.2% to 92.8% and from 21.6% to 49.6% for the (M=Cu) alloy by raising spinning rate from 0 (as-cast was defined as the spinning rate of 0 m/s) to 30 m/s. Furthermore, the high rate discharge ability (HRD), the limiting current density (IL) and the hydrogen diffusion coefficient (D) of the alloys notably increase with the growing of the spinning rate.
An Analytical Finite Element Technique for Predicting Temperature Distribution in Turning Titanium Alloy
Authors: Li Bin , Wang Hong
Published: June 2012

With the development of engineering technology, FEM can be used to simulate metal machining process and gain better understanding of material flow within dies, so as to optimize tooling to eliminate tears, laps and other forging defects. In this paper, numerical simulation was conducted by using FEM software on the whole cutting process for TC4 alloy mounting parts in an effort to investigate the metal flow behavior. The thermal simulation results obtained were compared with the cutting temperature and discussed in terms of literature data.
Comparative Analysis of HPDC Process of an Auto Part with ProCAST and FLOW-3D
Authors: Duan Hui Zhen , Shen Jiang Nan , Li Yan Ping
Published: June 2012

The high pressure die casting (HPDC) process of an ADC12 aluminum alloy auto part is researched by the software ProCAST and FLOW-3D, respectively. The possible HPDC defects of the auto part are analyzed. The difference of the filling process with the same technological parameter is studied. Compared with the simulation result of ProCAST, FLOW-3D software simulation result is closer to the die casting of the actual production.
Design for Noise Reduction of the Interior of Building Using Microcellular Foamed Plastics
Authors: Kim Hak Bin , Han Earl , Cha Sung Woon
Published: June 2012

The microcellular foamed plastics (MCPs) have high material strength, a relatively small cell size, and a high cell density in comparison with conventional foamed plastics. In particular, the small size of cell in MCPs makes many applications possible in a range of fields. Its high reflectivity enables its application as a reflector that is a part of the back light unit in the LED industry. Thanks to its low density and high strength, MCPs can be used as diaphragm in speakers. They also have many other uses. MCPs show a noise suppression property which allows them to be used in the building industry. A soundproofing plate made of MCPs exhibits a better soundproofing property in comparison with a soundproofing plate made of ordinary plastic. In this study, the author manufactured a soundproofing plate using microcellular foamed polypropylene (PP) and assessed the properties of the absorbing and proofing sound. As a result, the findings showed the possibility of using MCPs as a soundproofing plate in the building industry.
Development of Laminar Flow Cooling of Ultra-High Strength Ferrite-Bainite Dual Phase Steel
Authors: Lv Wei , Wu Di , Li Zhuang
Published: June 2012

In the present paper, controlled cooling in different ways was performed using a laboratory hot rolling mill in ultra-high strength hot rolled ferrite-bainite dual phase (DP) steel. The results have shown that the final microstructures of DP steel comprise ferrite, bainite and a small amount of retained austenite and martensite. DP steel has a tensile strength ranging from 1010 to 1130MPa and yet retains considerable total elongation in the range of 14–17%. The addition of Mn and Nb to DP steel leads to the maximum ultimate tensile strength, yield strength and the product of ultimate tensile strength and total elongation due to the formation of retained austenite and granular bainite structure. Laminar flow cooling after hot rolling results in a significant increase in the quantity of ferrite and bainite due to the suppression of pearlite transformation, and as a result, the present steel possesses high strengths and good toughness.
Development of SIMPLE-Like Algorithms for Incompressible Navier-Stokes Equations in Liquid Processing of Materials
Authors: Gong Hai Jun , Liu Yang , Fan Xue Yi , Xu Da Ming
Published: June 2012

For a clear and comprehensive opinion on segregated SIMPLE algorithm in the area of computational fluid dynamics (CFD) during liquid processing of materials, the most significant developments on the SIMPLE algorithm and its variants are briefly reviewed. Subsequently, some important advances during last 30 years serving as increasing numerical accuracy, enhancing robustness and improving efficiency for Navier–Stokes (N-S) equations of incompressible fluid flow are summarized. And then a so-called Direct-SIMPLE scheme proposed by the authors of present paper introduced, which is different from SIMPLE-like schemes, no iterative computations are needed to achieve the final pressure and velocity corrections. Based on the facts cited in present paper, it conclude that the SIMPLE algorithm and its variants will continue to evolve aimed at convergence and accuracy of solution by improving and combining various methods with different grid techniques, and all the algorithms mentioned above will enjoy widespread use in the future.
Development of Utilization of Vanadic Titanomagnetite
Authors: Zhou Lan Hua , Wang Jun , Gou Shu Yun , Chen Lv Ying , Li Ze Rong
Published: June 2012

Fe, V and Ti of vanadic titanomagnetite in Panxi region in China have been extracted in traditional BF process so far, but the comprehensive utilization level of the ore is lower. To solve the problem, the research on direct reduction of the ore have been carried out continuely. Because of the restriction of equipment, technology and other factors, there is not a new technology can achieve mass industrial production. It is found by analysis that the BF process hold a leading position and direct reduction process can only be a supplement of utilization of vanadic titanomagnetite at presnt and days to come.
Computational Estimation of Fan Casing Noise at Blade Passing Frequency Component Noise
Authors: Cai Jian Cheng , Zhang Yong Hai , Long Shuang Li
Published: June 2012

This paper studies both vibroacoustics and aeroacoustics of a centrifugal fan casing; the aim of this study is to explore a methodology to make quantitative predictions of fan casing noise. The spectra of the fan noise and casing vibration were firstly presented; discrete components related to the rotational frequency protrude in the spectra, especially the blade passing frequency (BPF). Computational fluid dynamics (CFD) technique was used to obtain the three-dimensional unsteady turbulent internal flow. Attention was paid to the pressure fluctuations on the volute wall; the shapes of pressure fluctuation were nearly sinusoidal in nature, with the BPF as the primary frequency. On the vibroacoustic side, Fast Fourier Transform (FFT) was applied to the time series of pressure fluctuations to extract the BPF component. A finite element analysis (FEA) model of the casing structure was constructed, and was validated by experimental modal analysis. The harmonic dynamic response of the casing structure was calculated with the BPF pressure fluctuation component as the excitation. The vibration results were then taken as the velocity (Neumann) boundary condition for the noise radiation model which was built in boundary element method (BEM), and the sound radiation was calculated. On the aeroacoustic side, the BPF component of pressure fluctuations was modeled as acoustic dipole source, and sound radiation was also solved by BEM. Results show that the sound pressure level (SPL) of vibroacoustics is fairly small compared to the aeroacoustic counterpart. This study shows that CFD, FEA together with BEM can be used to numerically predict BPF casing noise of turbomachinery successfully.
Dyeing Process Research of Shengma Fiber Knitted Fabric
Authors: Chen Zhe Yu , Meng Jia Guang , Shang Hai Yan
Published: June 2012

In this paper, dyeability of Shengma fiber knitted fabric is investigated with reactive dyes in one bath process. Orthogonal analysis method is used to optimize and find the optimal dyeing process, and then reach the optimal dyeing effect.
Effect of Heat-Treated Process on Tensile Property of PLA Plied-Yarn
Authors: Lin Jia Horng , Hsieh Cheng Tien , Hu Jin Jia , Chen Yueh Sheng , Chen Wen Cheng , Lou Ching Wen
Published: June 2012

Polylactic acid (PLA) fiber, as a biodegradable synthetic aliphatic polyester fiber, has properties of biocompatibility, biodegradability and processing. Therefore, this study used PLA multifilament to prepare numerous plied yarns, respectively 75D, 75D×2, 75D×3, 75D×4 and 75D×5. Afterwards, these yarns were twisted with 3, 5, 7 twist/inch and then heat-treated respectively. The resulting yarns were tested for their tensile property tensile tenacity and tensile elongation. Moreover, the heat-treated effect was discussed on influencing tensile property.
Experiment Research on Asphalt Pavement Performance with Different Flame Retarding Systems
Authors: Wang Hao Qing , Zhao Liang , Tian Bin
Published: June 2012

On the basis of finishing research of flame resistance level-2 asphalt, further experiment is carried out to research high and low-temperature pavement performance of flame retarding asphalt of the phosphorous-phosphorous, halogen-phosphorous and other collaboration system and analyze influences on the asphalt pavement performance by flame retardant of different systems.
Experimental Study on Optimizing the Effect of Drilling Parameters on Roundness Error of Holes of Aluminum 7075 Using Response Surface Methodology
Authors: Zargar Setayesh Hakak , Tahmasbi Vahid , Besharati K. , Farzami Mohammad
Published: June 2012

In the present work, an experimental study has been made to optimize the drilling process parameters. Response surface methodology based on central composite design (CCD) has been used to study and analyze the experiments. Twist drill diameter, cutting speed and feed of drilling were chosen as variables to study the process performance for the responses of the hole surface quality (Ra) and the roundness error on aluminum 7075. Experiments were performed on a newly designed experimental setup developed in the laboratory. The results identified the most important parameters to maximize the hole surface quality and minimize roundness error. Finally, regression equations were obtained to predict the responses for different values of variables.
Gelcasting of BeO
Authors: Shi Wei
Published: June 2012

Aqueous gel-casting of beryllia using polyelectrolyte NH4PAA as a dispersant has been investigated. The effects of the dispersant amount, pH values on the surface properties of BeO powders in aqueous solvent were studied and high solids loading BeO suspension (45 vol.%) was developed. A premix solution containing 15-20 wt.% of AM monomer can provide enough mechanical strength for the green body obtained from 45 vol.% BeO suspension. SEM photography indicates that BeO ceramics with homogeneous microstructure can be fabricated. The thermal conductivity of sintered green body is 182.1±10 W/(m.K). Gelcasting is a suitable process to form BeO ceramic parts.
Theoretical and Experimental Contact Stiffness Characterisation of Nominally Flat Surfaces
Authors: Piscan Iuliana , Ompusunggu Agusmian P. , Janssens Thierry , Predincea Nicolae
Published: June 2012

In this study the tangential contact stiffness between two elastic bodies having nominally flat surfaces with different material combinations is investigated. The tangential contact stiffness between these two elastic bodies is first calculated based on the Greenwood-Williamson-McCool contact theory. Then, the tangential contact stiffness is determined by experimental investigation on a tribometer under the effect of different values of normal load and tangential displacement amplitude. The tangential contact stiffnesses obtained from the experimental data show a good agreement with the theoretical results, where the trends are similar and they are in the same order of magnitude.
Multi-Agent Robotic System – Robotic Soccer in Category Mirosot
Authors: Hajduk Mikuláš , Sukop Marek
Published: June 2012

The development of multi-agent robotics systems and their activity strategy is very complicated and complex problem in terms of fulfilling the required goals. There are plenty of testing domains for such systems. This paper points at realization of multi-agent robotic system for robot soccer by the team of TUKE Robotics (Technical University of Kosice) – category MiroSot 5 to 5. A hierarchic configuration was used in the application, containing one superior software agent and other agents (agent = robot = player).
Flammability Behavior of Composite Mixed with Retardant Agents
Authors: Al-Mosawi Ali I. , Rijab Mustafa Ahmed , Salaman Ali J. , Alwash Naser A. , Aziz Naglaa S.
Published: June 2012

The flammability characteristics and synergistic effect of zinc borate with antimony trioxide in araldite resin composite have been studied by thermal erosion test . Zinc borate was added first to araldite resin reinforced by hybrid carbon-Kevlar fibers as a surface layer(5mm) thickness .Then, the result composite material was exposed to a direct flame generated from Oxyacetylene torch (3000°C) with different flame exposure intervals (10,20mm), and study the range of resistance of retardant material layer to the flames and protected the substrate .After that , antimony trioxide was added to zinc borate with various amount(10%,20%,30%) to forming a hybrid flame retardant for enhance the action of this material to react flame . Hybrid retardant exposure to same flame temperature and exposure distances. Method of measuring the surface temperature opposite to the flame was used to determined the heat transferred to composite material . the best results was obtained with large exposed distance and large percentage from protective layer which is zinc borate with (30%) antimony trioxide .
About the Study of Bending Beam on Elastic Environment by Transfer-Matrix Method
Authors: Suciu Mihaela
Published: June 2012

The paper presents an analytical calculus for the bending beams on elastic environment. The elastic environment sends in all points a reaction force proportional to the deformation with the same constant of proportionality in all points. The calculus of the state vectors associated at the origin section and at the end section of the beam is made by Transfer-Matrix Method, putting the conditions on the supports (extremities) of the beam. After, we can calculate all state vectors for all sections of the beam.
Evaluation Flame Retardancy of Epoxy Composite by Using Design of Experiments
Authors: Al-Mosawi Ali I. , Ahmed Jaheel K. , Hussain Haydar A.
Published: June 2012

The present research aimed to study the possibility to increasing flame retardancy of polymeric composite materials reinforced by fibers by coating by a flame retardant layer represent antimony tetroxide (Sb4O6) as a coating layer (4mm) thickness to react and prevent spread of flame on surface of composite material consist of epoxy resin reinforced by Kevlar fibers and exposed this coating layer to oxyacetylene flame with different exposure intervals (10,15,20mm) and study the range of resistance of flame retardant material layer to the flames and protected the substrate .The experimental results show that a great increment in thermal resistance and flame retardancy after coating by tetroxide as well as rising flame resistance increased exposure distances to flame . Determination the percentage contribution effects of main factors were time , exposure interval ,and noise variables (error) to the variability of the surface temperature at significant level (α=0.05) .Results show that the percentage of main factors were :time=63.15% , exposure interval=14.81% and noise variables=22.04%.
Dynamic Thermal Analysis of Laminated Cylinder with a Piezoelectric Layer Based on Three-Dimensional Elasticity Solution
Authors: Daneshmehr A.R. , Akbari S. , Nateghi A.
Published: June 2012

Three-dimensional elasticity solution is presented for finite length, simply supported, laminated cylinder with a piezoelectric layer under dynamic thermal load and pressure. The piezoelectric layer can be used as an actuator or a sensor. The ordinary differential equations are obtained from partial differential equations of motion by means of trigonometric function expansion in longitudinal direction. Galerkin finite element method is used to solve the resulting ordinary differential equations. Finally numerical results are discussed for different situations.
VBA for Tracking Manufacturing Process in SME
Authors: Dobra Andreea
Published: June 2012

This paper presents a tools management ways (VB for Excel) for small and medium enterprises. The implementations are simple and accessible. The monitoring tools and insurance a minimum stock (for the manufacturing process without interruption) are the necessary elements to manage. The technological itinerary dictates the type and list of needed tools, to ensure the manufacture process. By using a mobile system for transfers the used tools into warehouse and the necessary tools to CNC manufacturing center, the preparation time for the manufacturing process, can be reduced. This can be monitored and managed by using a barcode scanner and dedicated software.
Possibilities of Use of Virtual Reality in the Field of Manufacturing Systems
Authors: Koukolová Lucia , Hajduk Mikuláš , Belovezcik Andrej
Published: June 2012

The paper presents the structure and performance of the system created by a work team at Department of Production Systems and Robotics at Technical University of Kosice. System MSEVR – „ Modular system for experimentation in virtual reality“ is universal flexible system created for teaching automated and robotic systems by means of new advanced teaching aids, including virtual reality. It has been created as a specialized website and its possibilities are varied. Particular use depends on creativity of a user. Built-in tools enable to use it adequately when teaching construction of industrial robots, to present their kinematic structure or other properties of individual machines. It also enables to work with machine aggregate. In real-life working the system has been tested for optimization of process layout where the full advantages of virtual reality were taken.
Thermal Shock in Sprayed Layers Observed Using Infrared Thermography
Authors: Viorel-Cristian Dina , Dumitru Gabriel Marius , Bogdan Dumitru , Dumitrascu Constantin , Constantin Dand Botez Sorin
Published: June 2012

In this paper we study the behavior of Rul1 layers deposited by thermal metal spraying to the thermal shock using infrared thermography. It will present thermo grams obtained for the thermal field distribution during heating and the resulting defects. In particular it aims to interfaces defects such as lack of adherence.
Modelling and Kinematic Analysis of a Built Up Linear Delta Robot
Authors: Uyar Erol , Mutlu Lutfi
Published: June 2012

In this paper kinematic analysis of a 3-PUU translational parallel manipulator (TPM) is made by creating the forward and inverse Kinematic solutions. For a given position, control of the end effecter is then realized by using the calculated inverse kinematic parameters as reference values. For kinematic analysis relevant equations are derived from geometrical vector relations. For the forward and inverse kinematic solutions of the non-linear model a MATLAB based iterative algorithm is developed and the inverse kinematic solutions of limbs, are then used to control the end effecter position through screw rails which are driven by DC motors. After the general mechanical design of the manipulator all parts are drawn and modelled in SolidWorks, and a simulation of the motion in three dimensional space is made. To support the reliability of calculated parameters through inverse kinematic solutions, results are compared with the values of SolidWorks based simulation model of the manipulator. Furthermore a real position control with use of feed back encoders is applied and the evaluated results are compared with the results of a simulation model. Very similar and satisfactory results are obtained with both simulation and real application.
Research on Correlation between any Plantar Diseases and Stability
Authors: Braun Barbu Cristian , Baritz Mihaela Ioana , Cotoros Diana Laura
Published: June 2012

The paper describes the way in which both results on stability and plantar pressure providing from different human subjects young aged close were obtained and processed to find the interdependence between any plantar malformation or diseases and some stability or locomotion problems. For this reason 5 young close aged human subjects without any plantar and stability diseases were tested both for their stability and plantar pressure as mean values evaluation reported to other 2 young close aged human subjects having different small plantar diseases. The aim in this study was to find the results on stability for the 2 special persons reported to the stability results for the first 5 normal tested subjects.
Adaptive Drive of Manipulator Module
Authors: Ivanov Konstantin S. , Balbayev Gani K.
Published: June 2012

The production operation of the module includes stages: acceleration, breaking and the installed motion. Optimum on power and sizes the drive of the module of the manipulator should overcome the force matching a variable load at different stages of operation at constant power of an engine. For this purpose it is offered to use the adaptive mechanical drive containing the electric motor and an adaptive gear variator with constant engagement of toothed wheels. The adaptive gear variator provides the variable transfer ratio only owing to the mechanical properties lost-free energy on its transformation and without control means. The gear variator with constant engagement of toothed wheels is a planetary gear with two degrees of freedom, having the superimposed differential constraint under action of forces.
Development and Optimization of Perimeter Traversing Robot
Authors: Mohanty Sudeshna , Mahapatra Subhrasmita , Panda Sanat Ku. , Rath Plavan Ku. , Sarangi Manoj Ku. , Bylya Olga I.
Published: June 2012

This paper presents the development and optimization of control parameters of an autonomous robot capable of traversing a planar surface without going beyond the surface boundary. Based on standard Lego® design, the proposed robot travels on surfaces with different geometrical shapes and collects data on the basis of which the perimeter can be redrawn using MATLAB. The remote detection capabilities of this robot can find its application in construction, defence surveillance operations, geological and space research and industry as an automated process of measurement, especially when the surface being measured is beyond human reach. The robot detects the edge using a color sensor which differentiates the color of the surface from its boundary. After detecting an edge point, the robot retracts and turns to detect an edge point in another direction. The length of the paths traversed by the robot from one edge point to another serves as the input data to the MATLAB program which computes this data and transforms it to a plot of the perimeter. Experiments conducted demonstrate the optimal values of parameters for control of motion of the robot to give satisfactory results with minimal power and time expenditure.
Nonlinear Aeroelastic Behavior of Slender Wings Considering a Static Stall Model Based on Wagner Function
Authors: Badiei Davood , Sadr Mohammad Homayoon , Shams Shahrokh
Published: June 2012

The aeroelastic behavior of high aspect ratio wings in an incompressible flow is investigated. The nonlinear nonplanar bending-bending-twisting motions of beam theory is used for the structural equations assuming large deformations with small strains, small Poisson effects, inextensional beam theory, and linear elastic material characteristics by neglecting warping and shear deformation. An Unsteady nonlinear aerodynamic static stall model based on the Wagner function is introduced and then is used for determination of aerodynamic loading of the wing. In this aerodynamic model, the static lift curve vs. angle of attack is approximated by a piece-wise curve and for each linear part of this curve a corrected Wagner theory is used. Combining these two types of formulation yields fully nonlinear integro-differentials aeroelastic equations of motion. The governing equations will be solved to predict the nonlinear aeroelastic response of a wing in the stall and post stall regions using Galerkin's method and a numerical method without the need of adding any aerodynamic state-space variables and their corresponding equations. The obtained equations are solved for some test cases and the obtained results are compared with the results given in the literature. Also a study is done to show effects of nonlinear aerodynamic static stall model on the limit cycle oscillations.
Simulation on the Distribution of Forces under the UAV’s Specific Profiles
Authors: Florescu Daniela , Florescu Iulian
Published: June 2012

The UAV prototype flight unit for monitoring the natural environment has imposed a number of corrections on the shape and size of the external configuration, stability in flight and trying different types of propeller and engine drive. For different types of propeller tested, the static pressure distributions were determined for different values of the forces on the device body. Simulations of flow and pressure distributions have led to an analysis of differences between the forces created in three different cases imposed by the diameter propeller airflow created by the device.
The Command and Control Software Implementation of a CCD Video 2 Axis Gyrostabilized Payload Used by a Fixed Wing UAV Configuration Platform
Authors: Axente Corneliu , Coşereanu Liviu , Suteu Daniel Ioan
Published: June 2012

The software algorithm is designed to ensure compatibility between the commands given by the operator and the need to stabilize the CCD/IR payload. The implementation was made on a mini-turret with 2 degrees of freedom mounted on a miniUAV. Appropriate command and control functions were developed by programming an Atmel family microcontroller.
Validation of the Mathematical and Numerical Models for Artillery Barrels Autofrettage Based on Hydrostatic Procedure
Authors: Bârsan Ghiţă , Petrişor Silviu Mihai , Giurgiu Luminiţa
Published: June 2012

The research of advanced gun barrels focuses on materials or the combination between advanced materials and new innovative processes that enable the increase of the life cycle and performances of all calibers cannons. In addition to the investigation of new materials, considerable efforts were made for developing new techniques. The paper describes a theoretical framework validated with the experimental tests for increasing mechanical properties of thick-walled tubes subjected to high interior pressure loads. The theoretical model established a mathematical model of calculus for non-linear environments in the case of self-hooping or autofrettaging of the thick-walled tubes. The mathematical model was validated with experimental tests performed in the Mechanical Engineering Laboratory of the Military Technical Academy in Bucharest on a standard tension test specimens collected from the abutment barrel made out of alloyed steel. Finally, the present paper introduces some theoretical guidelines of hydrostatic procedure in the field of artillery barrels manufacturing, as well as experimental data obtained after using the autofrettage procedure.
Experimental Study of Vortex Shedding Control Using Plasma Actuator
Authors: Mirzaei Masoud , Taleghani A. Shams , Shadaram A.
Published: June 2012

This paper aims at experimental investigation of the active flow control with plasma actuator over an airfoil. The method involved application of single dielectric barrier discharge in order to change the frequency of vortex shedding and the turbulence characteristics from a NACA4412 airfoil. The objective was to reduce control flaps noise in transporting aircraft via an effective body force generated by the actuators. Results indicated that the use of plasma actuator led to a significant decrease in the frequency of vortex shedding around the flap whereas a significant increase in turbulence levels was achieved at a distance away from the actuator.
A New Smoothing Method Based on Nonsmooth FB Function for Second-Order Cone Programming
Authors: Zeng You Fang , Jian Jin Bao , Tang Chun Ming
Published: June 2012

Based on a new smoothing function of the well-known nonsmooth FB (Fischer-Burmeis-ter) function, a smoothing Newton-type method for second-order cone programming problems is presented in this paper. The features of this method are following: firstly, the starting point can be chosen arbitrarily; secondly, at each iteration, only one system of linear equations and one line search are performed; finally, global, strong convergence and Q-quadratic convergent rate are obtained. The numerical results demonstrate the effectiveness of the algorithm.
A Bimaximum Entropy Method for Solving Nonlinear Constrained Continuous Minimax Problem
Authors: Huang Qiu Hong , Cao De Xin
Published: June 2012

A numerical method is proposed for solving a sort of constrained continuous minimax problem, in which both the objective function and the constraint functions are continuously differentiable about superior decision variables and are continuous about lower decision variables .Besides,the constraint functions include only superior or lower decision variables．The problem is transformed into unconstrained differentiable problem with the idea of the discrete maximum entropy function and the continuous maximum entropy function and the penalty function method．The basic algorithm is established．The convergence is proofed．Numerical examples are given and show the efficiency and the reliability of the algorithm.
Wavelet Shrinkage Based Variational Image Decomposition Model
Authors: Li Min , Sun Xiao Li , Xu Chen
Published: June 2012

A new class of variational models based on Besov spaces B1,1s(s>0 ) and homogeneous Besov space E=B∞,∞-1for image decomposition is proposed. The proposed models can be regarded as generalizations of Aujol-Chambolle model. The associated minimizers of variational problems can be expressed by applying different shrinkage functions which depend on the wavelet scale to each wavelet coefficient. The wavelet based treatment simplifies computation of this class of variational models. Finally, we present numerical results on denoising of both real and remote sensing images.
The Application of MLAMBDA for Time Series Radar Interferometry
Authors: Mu Jing Qin , Zhan Sheng
Published: June 2012

The time series analysis for D-InSAR is a new kind of method. While modeling with Gauss-Markoff model and estimating parameters, how to search for integer phase ambiguity needs to be addressed. In the study, the modified least-squares ambiguity decorrelation adjustment algorithm (MLAMBDA) is applied for the optimal integer phase ambiguity. The problems about applying are analyzed and solved by many experiments. At last, the method is applied for the project of all Tianjin district and the result is correct and effective.
An Adaptive Image De-Noising Method Based on Singular Value Decomposition
Authors: Zhou Chun Bing , Zhang Zhi Jia
Published: June 2012

In this paper, we propose a new combined model for image de-noising. The singular value decomposition has been widely used in the image application such as de-noising till now. There is a problem, which is how to confirm the number of the singular values in the process of image reconstruction, need to solve in the process. Then the paper discusses a minimum energy model to confirm the number through the way of calculating the local minimum in the defined energy curve. The experiment results show that the established model is consistent to the fact under the situation that if the image be with regular structure.
Evaluation for the Hypersonic Near-Space Target Threat Based on GRA-TOPSIS Model
Authors: Wu Xiao Dong , Li Wei Min , Zhang Lin
Published: June 2012

From the need of antagonising the hypersonic near-space target (HNST), a multi-attribute evaluation method of HNST threat based on RAG-TOPSIS is proposed; the target attribute weights are dealt with using RAG; the grey state for people to understand the selection of attributes in the traditional TOPSIS is avoided and the confirming of the weights of target attributes is more scientific. The multi-attribute evaluation model of HNST’s threat is established, then the rationality and effectiveness of the method is verified by an example.