bluuebunny/crossref_metadata_2025 huggingface dataset:
Recycling of Metal Ore Mill Tailings
Authors: Golik V.I. , Rasorenov Yu.I. , Efremenkov A.B.
Published: October 2014

The problems of ore mill tailings disposals and eco-economic efficiency of their use are considered. The paper provides the fundamentals of geo-mechanical control of the rock mass by low-strength solidifying mixtures of recyclable tailings. The essence and results of mechanochemical experiments on non-ferrous, ferrous metals and coal tailings are considered. A model to determine the economic and environmental efficiency of this technology is developed.
Movement of Liquid Metal in a Weld Pool when Welding with Pulsed Arc
Authors: Krampit A.G. , Dmitriyeva A.V.
Published: October 2014

High-speed shooting records of consumable electrode pulsed arc welding in an atmosphere of carbon dioxide gas help to obtain data of changes on a weld pool surface.
Determination of a Wire Heat Temperature under a Pulse-Arc Welding Condition by Means of a Calculation and Graphic Method
Authors: Krampit A.G. , Krampit M.A.
Published: October 2014

In this paper authors observe a pulse-arc welding apparatus that uses a segment of an extended protrusion of an electrode wire as a resistance. Authors present method which was used to calculate a wire heat temperature in a pulse-arc condition.
Structural State Scale-Dependent Physical Characteristics and Endurance of Cermet Composite for Cutting Metal
Authors: Ovcharenko V.E. , Mohovikov A.A. , Yu Bao Hai , Zhao Yan Hui
Published: October 2014

A structural-phase state developed on the surface of TiC/Ni-Cr-Al alloy cermet under condition of superfast heating and cooling produced by pulse electron beam melting has been presented. The effect of the surface structural state multimodality on the temperature dependencies of friction and endurance of the cermet tool in cutting metal has been investigated. High-energy flux treatment of subsurface layers by electron beam pulses in argon-containing gas discharge plasma serves to improve the endurance of metal cutting tools multiply ( by a factor of 6), to reduce friction on the account of precipitation of secondary 200 nm carbides in binder interlayers. It is possible to improve the cermet tool endurance for cutting metal by a factor of 10-12 by irradiating the cermet in a reactive nitrogen-containing atmosphere with ensuing precipitation of nanosize 50 nm AlN particles in the binder interlayers.
Interfacial Adhesion between Thermal Spray Coating and Substrate Achieved by Ultrasonic Finishing
Authors: Kovalevskaya Zhanna G. , Klimenov Vasilii A. , Zaitsev Konstantin V.
Published: October 2014

The paper presents a pretreatment of the substrate material prior to the thermal spraying process. The ultrasonic finishing method allowed creation of a rolling topography comprising alternating projections and cavities, compressive stress, and increase of the number of defects on the surface. Optical profilometry and metallographic analysis allowed detecting of adhesion zones which form a strong physicochemical bond at the interface between the coating and the substrate material. This interfacial adhesion should provide a firm adhesion strength in end products.
Scandium Influence on the Structure and Chemical Inhomogeneity of Welded Joints of Al-Zn-Mg-Cu System Alloys
Authors: Fedorchuk Viktor , Falchenko Iuriu
Published: October 2014

Structural transformations and formation of chemical inhomogeneity in the weld and HAZ metal in fusion welding of complex alloy of V96 type were studied. It is shown that under the influence of welding heat, partial melting of the alloy phase components proceeds in the heat-affected zone with formation of structures of eutectic origin in the form of extended interlayers along the grain boundaries, causing metal embrittlement. Scandium addition to the alloy enables reducing the solidification processes and degree of segregation along the grain boundaries, as well as localizing partial melting of the grains without formation of coarse eutectic interlayers.
Effect on Grains Form on Performances Grinding Wheels
Authors: Korotkov A. , Korotkova L. , Gubaidulina R.
Published: October 2014

Efficacy of existing designs grinding wheels is relatively low and one of the main reasons for this situation is the lack of control over the shape of grains included in the composition of these tools and their employees cutting elements. Standard wheels are composed of grains with an arbitrary, varying in the range from isometric to the needle-like species. When only part of the grain has a favorable geometry for cutting and participates fully in aggregate nom cutting process. Arranging grain shape and as a consequence, their geometry can increase the efficiency of each individual grain and thus improve the performance of grinding wheels as a whole. The study on the establishment of the variety of forms of grains for abrasives Russian and German production made standard way - by ebb abrasive ingots, their crushing and screening a number of particle size fractions. Studies have shown that each has its abrasive distribution pattern in the manner that depends on the brand of abrasive characteristics of technology and the manufacture of abrasive grit. The interrelation of grain shape to their geometry as derivation of mathematical models. A pilot batch of grinding wheels with controlled grain shape, are prepared by separating the initial mass of abrasive on a number of fractions with the same shape of grains using the vibratory separator. Experimental wheels were tested on the operating processing bearing rings, and as compared with the following instruments used an arbitrary shape of grains. Found that a differentiated approach to the choice of grain shape allows for a increase resistance grinding wheels in 1,5-3,9 times , reduce roughness of machined surfaces in 1.2 - 3.2 times, roundness - 1.3 times, waviness - 2.3 times the wear sized - 2.0 - 3.0 times.
Stipulation of Conditions of CMF with Required Allocation of Tool Materials
Authors: Retyunsky O.Y. , Kurilin A.A.
Published: October 2014

The existing production techniques of CMF (changeable multi-faceted plates) are not sufficient for production of tools with enhanced hardness parameters. In order to implement the production technique of composite CMF using layer by layer filling of press mold the research was conducted of the rotation speed of the press mold on the interface form of powdered materials phases. The suggested production method of composite CMF allows to enhance the hardness of cutting plates by 10–15%.
Increase of Firmness of the Metall-Cutting Tool on the Basis of Removal of Internal Tension in Replaceable Cutting Insert
Authors: Chuykov R.S. , Mokhovikov A.A. , Chuykov S.S.
Published: October 2014

Results of research of types of the destruction caused by existence of internal tension in a tool firm alloy at production of the replaceable many-sided plates (RMSP) which can be removed by preliminary heating of cutting plates prior to cutting process are given in work. The new technical solution on realization of a method of preliminary heating of SMP is developed for removal of internal tension in the tool firm alloys (TFA), and also the special design of the metal-cutting tool is developed for increase of operability of hard-alloy SMP with preliminary heating.
Methodology of Application of the Structural Shift Mechanism for Regulation of the National Economic Management System
Authors: Barysheva G.A. , Novoselova E.G.
Published: October 2014

The approach to studying the structure of economy is determined by the nature of the national economy as a system. Identification of the economic system development mechanism will help identify the opportunities to influence its structure. It was found out that on the basis of the study of the mechanism of maintaining the integrity of the system in its development it becomes possible to achieve the most effective application of the systematic approach using conceptual studies of functioning of economic systems in the basic areas of economic theoretical studies. Based on the dynamic aspects of systems concept, it is proposed to focus the study of the problems of the economic structure development on the mechanism of structural shifts.
The Organization of Engineering Shop “Lean” Management System
Authors: Kokareva Victoria V. , Malyhin Andrey N. , Smelov V.G.
Published: October 2014

This article describes the analysis of the manufacturing enterprise (machine shop). We propose the methods and tools of optimization in order to build a "lean" management system. The purpose of constructing this management system is to eliminate losses, reducing costs, increasing productivity. We used SWOT-analysis tools, VSM (value stream mapping) and discrete simulation (Plant Simulation).
Structurization of Data and Knowledge for the Information Technology of Road-Climatic Zoning
Authors: Yankovskaya Anna , Efimenko Sergey V. , Cherepanov Dmitrii
Published: October 2014

The article is devoted to structurization of data and knowledge for the information technology of road-climatic zoning (IT RCZ). The IT includes an intelligent system based on the extended matrix model of data and knowledge representation on the investigated area of the West Siberian region and the matrix model of knowledge representation preassigned by experts in the field of RCZ without specification of particular territories. Structurization is conditioned upon the extended matrix model.
The Model of Strategic Planning at the Enterprise with Process Management Approach
Authors: Kataev M.Yu. , Emelyanenko V.A. , Ponomareva M.G.
Published: October 2014

The article discusses the model of strategic enterprise management with process management approach. The authors developed an algorithm of management decisions.
Information Technology of Estimation and Forecasting Innovative Activity Based on Distributed Data Input
Authors: Nesteruk Dmitriy , Momot Mikhail
Published: October 2014

The usage of the neuronetwork model of experts’ interaction in forecasting the influence of results of innovation’s industrial implantation is offered. The concept of the web oriented expert system construction is proved.
The Problems of Developing the Ecological Market of the Region
Authors: Shabashev V.A. , Trifonov V.A. , Verzhitsky D.G.
Published: October 2014

The definition of the ecological market is given. The regularities of the ecological market development abroad are shown. The ecological and economic indicators of the ecological market of the region are suggested. The basic problems of the ecological market and its infrastructure in the Kemerovo Region are determined.
Algorithm of Controlling Servo Drives by Means of Atmega 8 Microcontroller
Authors: Momot Mikhail , Biktimirov Artur
Published: October 2014

The author suggests unconventional method of parallel servo drives control by means of input/output ports using interrupt timer.
Price Differentiation as Economic and Mathematical Model of Increasing the Competitive Power of a Company
Authors: Trifonov V.A. , Grichin S.V. , Kovaleva M.A.
Published: October 2014

The paper considers economic events associated with price formation, namely methods of price differentiation in conditions of market competition, certain ways conducing to meeting the demands of different strata of the population with different consumer opportunities are indicated.
Selecting an Economical Variant of the Manufacturing Method of Engineering Product Fabrication under Current Conditions
Authors: Gubaidulina R.H. , Petrushin S.I. , Galeeva A.A.
Published: October 2014

The paper considers the problem of economic assessment of the process engineering solutions. The formula for preliminary calculation of the reduced costs for every variant of the manufacturing method is suggested. The authors provide the structure of a database for implementation of the given method.
Prospects for of Processing Car Tires
Authors: Valuev D.V. , Semenok A.A. , Kotova D.O. , Valueva A.V.
Published: October 2014

This article analyzes the problem of recycling of used tires and-retired rubber products, which is of great ecological and economic importance for all developed countries. Nonrenewable natural oil feedstock necessitates the use of secondary resources with maximum efficiency, ie place in the mountains of garbage we could get a new one for our region industry - commercial recycling. This paper presents an overview of methods and technologies for disposal of tires in the world and ways of using waste in the form of dispersed materials.
The Method of Receiving of Surface Alloys Si-Ti System
Authors: Petrikova Elizaveta A. , Ivanov Yurii F. , Teresov Anton D.
Published: October 2014

The technique has been developed and the possibility of doping titanium by silicon to form a multilayer composite Ti (base) / Ti5Si3 (surface layer) material, which is special interesting as a high-temperature light material due to the formation of high-temperature (Tm = 2400 K) of titanium silicideTi5Si3, synthesized in a single vacuum cycle during high-intensity electron beam treatment of submillisecond duration on the film (silicon) / substrate (titanium), formed by spraying silicon by electron beam.
Tribotechnical Properties of Sintered Aluminum Alloys
Authors: Rusin N.M. , Skorentsev A.L.
Published: October 2014

The frictional behavior of sintered composite materials based on aluminum with high content of solid intermetallics and soft tin was investigated. It was found that at the moderate pressures and in absence of a liquid lubricant, both types of composites exhibit a low friction coefficient and good wear resistance.
Simulation of Wind Influence on the Thermal Processes in Gas-Shielded Welding
Authors: Chinakhov Dmitry A. , Vorobyev A.V. , Gotovshchik Yu.M.
Published: October 2014

A set of various factors and phenomena defines the quality of welded joints. This is especially noticeable for outdoor welding. A numerical simulation of welding processes with consumable electrode with traditional and two-jet gas shielding was carried out to study the influence of wind speed on the movement of the shielding gas (CO2) and the change of thermal processes in the heat affected zone. It is established that the use of two-jet shielding in welding with a consumable electrode leads to an increase in hardness of the shielding gas stream and lower offset of thermal fields in the welded product in the wind direction. It testifies to a better quality of shielding and smaller probable changes in symmetry of structure formation and mechanical properties of the heat affected zone.
Evaluation of the Effectiveness of an Eco-Friendly Technology for Splicing Steel Cord Conveyor Belts
Authors: Hardygora Monika , Bajda Miroslaw , Blazej Ryszard
Published: October 2014

A new eco-friendly method of splicing steel cord conveyor belts without the use of noxious materials has been developed by the Mining Institute at Wrocław University of Technology in collaboration with the Bełchatów Lignite Mine – the two leaders in implementing state-of-the-art and environment friendly technologies in mining in Poland [1,2,3]. Polish lignite mines use belts with steel cords. Such belts are spliced through high temperature vulcanization, which is not safe for the environment and has an adverse impact on human health. Strength and durability are the two main properties of belt splices, having a bearing on the failure-free operation of the belt conveyors used for the haulage of stripped rock or muck in open pit mines [4,5,6]. This means that properly made steel cord belt splices should have the strength and durability parameters similar to the ones of the belt without splices. Many factors contribute to the quality of the splice, including the ones connected with the splicing technology, workmanship and with the fact that splices are made directly on conveyors in heavy mine conditions.
Mathematical Model for Determining the Lifetime of Conveyor Belts Depending on some Selected Parameters
Authors: Andrejiová Miriam , Grinčová Anna , Pavlisková Anna
Published: October 2014

In the last years, belt conveyors belong to the most frequently used means of transport in various industries. The most important component of the belt conveyor is the conveyor belt. Therefore, it is necessary to pay more attention also to optimal lifetime of conveyor belts. Conveyor belt lifetime is a very complicated issue. It is affected by plenty of factors, including above all the quality structure of the belt conveyor, optimal construction, production, and properties of the conveyor belt as such, adequate solution of conveyance route shifting, reasonable maintenance, and quality repairs of conveyor belts. The paper deals with the exploring the lifetime of conveyor belts depending from on some selected parameters obtained from the operating records of practice (thickness of paint layer, width and length of the belt, conveyor speed and quantity of transported material) with using appropriate mathematical - statistical methods.
Aviator System as an Alternative to Warehouse Handling Devices
Authors: Bindzár Peter , Straka Martin , Thate Thomas , Balog Michal
Published: October 2014

The Aviator is a floor-free working warehouse vehicle, which gives a third alternative to the market of stacker cranes that consist also of the narrow aisle stacker and the rack feeder. Officially introduced as Transfaster in 2002, this full-automatic working system has been realized several times. This article will give an overview concerning the structure of the system and its functionality, and will compare it to conventional systems regarding advantages, disadvantages and performance. Therefore ways of calculating cycle times are introduced.
Research of Electric and Mechanical Diagnostic Parameters of Drive Equipment
Authors: Stepanov Pavel , Lagutkin Stanislav
Published: October 2014

The paper considers research of electrical and mechanical diagnostic parameters of drive equipment, as well as processing and analysis of diagnostic information. We consider the current and vibration diagnostics of equipment, which consist of the asynchronous motor, the coupling and the worm-and-wheel reduction unit.
Selection of Belt Conveyors Drive Units Number by Technical – Economical Analysis
Authors: Despodov Zoran , Mijalkovski Stojance , Adziski Vanco , Panov Zoran
Published: October 2014

In this paper is presented a methodology for selection of belt conveyor drive units number by technical-economical analysis of their parameters. Belt Conveyors with follow drive arrangement will be considered: one, two, three and four drive units. In the technical-economical analysis are including: Tension forces, Power of belt conveyor, Costs for belt, Costs for power and reducers, Total cost for belt conveyor system.
Spatial Planning Using GIS Technology for Optimal Multi-Criteria Location of Belt Conveyor Route
Authors: Górniak-Zimroz Justyna
Published: October 2014

A procedure for determining the optimal location of the conveyor route in a mining company is described in the paper. The decision making process takes into account factors related to legislation as well as technical and environmental constraints. It results in multi-criteria optimization procedure that evaluates the availability of land for the location of the route of belt conveyors transporting the product from the mine to the railway depot. The aim of the analysis is to identify the best location for the belt conveyor that minimize the impact of the route on the environment and local society and use existing technical infrastructure. The approach is implemented in GIS platform, to provide decision support system.
The Usability of Terrestrial 3D Laser Scanning Technology for Tunnel Clearance Analysis Application
Authors: Novaković Gregor , Lazar Aleš , Kovačič Simon , Vulić Milivoj
Published: October 2014

After building underground constructions, spatial parameters monitoring is essential due to safety and statuary reasons. Therefore after completion of work in tunnels often supervision projects follow which include cross sections measurements, as well as ground and secondary wall layer deformations monitoring during consolidation era. Conventional approaches to achieve this type of documentations are different, however their downside is often that they are time consuming and even with combination of independent contractors, collected data is often deficient and corrupted with rough interpolations. Terrestrial 3D laser scanning (TLS) represents alternative approach to conventional monitoring methods [1]. With engineer planning approach, field work and data interpretation, TLS technology allows systematical and fast acquisition of shape and spatial orientation of complex objects and all their components. In case of shorter railway tunnels (up to 360 m) data for clearance analysis in correlation of standard cargo and tunnel surface, was captured with terrestrial 3D laser scanning method. Control of tunnel clearance is usually performed analogously and on conventional low equidistant cross section survey method. Considering that in this article we deal with relative old tunnels, in which there is no constant transversal profile but huge amount of geometric anomalies, simulation verification could be performed only with hi-grid definition survey method. With TLS larger amount of tunnels were measured and clearance analysis simulations for real case of standard cargo profile was made, based on radius and railway inclination of the tunnel. Standard or non-standard cargo transport planning with computer simulation now can be done in relatively short time. In this article is presented integration of TLS in case study of short railway tunnels with focus on clearance analysis applications with interactive and user friendly visualization for data interpretation. Other methods for different spatial parameters interpretations in underground constructions are presented as well.
A Wire Contact in the Construction of a Steel Rope
Authors: Krešák Jozef , Peterka Pavel , Kropuch Stanislav , Bérešová Andrea
Published: October 2014

A rope is an important, highly effective and one of the oldest transportation systems used in transport by mankind. Nowadays, steel ropes are mainly used for moving loads in mining - coal and ore exploitation, vertical or horizontal transport of persons and goods by cranes, elevators, lifts and cable ways. In many cases steel wire ropes are employed in extreme conditions with respect to the load of the rope: high temperature plants, mining corrosive environments and etc. In terms of labor safety it is necessary to certify each rope people come in contact when working with loads or a rope is used for transportation. It has to be done earlier than a rope is put into operation or on the market. Despite the fact the tests were performed correctly, a rope may not achieve the desired rope life. The great impact on the life of a wire rope has its interaction with a device a rope is deployed on. Interaction of a steel wire rope with a device it is deployed on has a great impact on its life. Durability is also affected by the way a rope is loaded, its maintenance and regular re-examination as well as its construction. Design accuracy is assessed according to strength and deformation properties of wires a rope is made of and a rope cross-section construction is taken in account as well. The important aspect of steel wire rope durability (which can be mostly influenced by a manufacturer) is an appropriate design of diameters and angles of wires winding in accordance with exactly defined conditions of operation. The paper presents models of ropes equally loaded which eliminates the most unfavorable factors affecting their life cycle.
Study of Steel Wire Ropes Defects
Authors: Lesňák Michal , Procházka Jan , Hlavatý Ivo , Pištora Jaromír , Kostiuková Gabriela
Published: October 2014

This article deals with the study of defects in steel wire. In the study we model magnetic fields around rope genetated by magnetized part of rope. The work is based on the finite element program ANSYS. For the purposes of the experiments we consider one strand wire rope construction. We define different kinds of defects and faults. The shape of the magnetic induction lines of generated fields depends on the size of the defect, the depth of rope violation or the presence of other nearby defects. The location and number of disturbances have been chosen to achieve the most versatile outputs. All of these modifications were analyzed and the results displayed in the 3D colored.
The Possibility of Products Consumption Forecasting Having a Seasonal Character in Ensurance of Steel Wire Ropes Maintenance
Authors: Kacmary Peter , Šaderová Janka , Rosová Andrea , Straka Martin
Published: October 2014

The paper introduces the possibility of consumption forecasting of certain products, having a kind of seasonal character in connection with the maintenance of steel wire ropes. Forecasting of seasonality is calculated using a combination of two different methods - the method of hidden periods to find out the periodicity of seasonality and the regression analysis to identify trends. It is assumed that seasonality in consumption of certain products, such as lubricants, becomes evident by preparations of mountain towing and transportation equipment for winter season.
Advantages of High Angle Belt Conveyors (Hac) in Mining
Authors: Grujić Miloš , Erdeljan Dragana
Published: October 2014

Increased depth in the mines looking for steep conveyor path. The classic means of transportation are not able to cope with high gradients. This paper discusses the advantages of belt conveyors with a high angle of inclination in the application of the mines. On that occasion, and give some lessons learned.
Analysis of the SCI, SCI-E and SSCI Journals in the Fields of Mining Transport, Haulage and Hoisting
Authors: Ristović Ivica , Dašić Predrag , Dašić Jovan
Published: October 2014

SCI, SCI-E and SSCI are one of the major citation databases in the world in the field of natural, applied scientific disciplines and social sciences. Within the SCI, SCI-E and SSCI, the areas or categories are classified of all scientific disciplines of natural and applied sciences. Scientific journals in the fields of "mining transport, haulage and hoisting" do not have their category within SCI, SCI-E and SSCI citation databases, but they can be faund into the following three categories: "Mining & Mineral Processing" (in the SCI and SCI-E), "Transportation" (in the SSCI) and "Transportation Science & Technology" (in the SCI and SCI-E). This paper presents an analysis of scientific journals indexed in SCI, SCI-E and SSCI for the mentioned three categories for the period 1998-2012.
Application the Renewal Theory to Determining the Models of the Optimal Lifetime for Conveyor Belts
Authors: Grinčová Anna , Andrejiová Miriam , Grendel Peter
Published: October 2014

Belt conveyance belongs to the continual transport systems characteristic with high-level conveying performances. Belt conveyors are of significant importance in the transportation of various types of materials in the industries like engineering, metallurgy and construction. The fundamental and the most expensive component of belt conveyors is the conveyor belt which is, during the operation on the belt conveyor, exposed to number of various loads that evoke the process of conveyor belt wear and damage. Lifetime of conveyor belts, which is the determining parameter for the belt conveyance economy and efficiency, is very important for the practice.Issues regarding the conveyor belt lifetime should be solved applying also the methods of operation analysis, especially the linear programming and the renewal theory that uses the theory of probability and mathematic statistics. The objective of our research was to determine the optimal lifetime (optimal performance duration) of a belt conveyor, applying the renewal theory, whereas the research was based on the cost approach of the renewal process.
A Preliminary Research on the Mechanism of Trench Landslide - Exemplified by Hejiacao Landslide in Zhen’an County of Shangluo
Authors: Wang Nian Qin , Li Shao Bing , Xue Yao Qiong , Pang Qi , Chen Xiao Peng
Published: October 2014

Through the detailed investigation of Hejiacao landslide in Zhen'an county, this paper analysed the developing features and forming factors of the trench landslides, Meanwhile, it preliminarily discusses the mechanism of deformation and failures for the trench landslide. The investigation shows that: 1The trench landslide is special in shape, mainly in pushing type with low angle, and has characters of slow creep speed and long time. It mainly takes place in populated regions with serious damage; 2The trench landslide is controlled by many factors, such as trench terrain, poor lithology, hydrologic condition and human activities; 3The trench landslide experiences three phases: Deposition-crack, pushing-creep and final destruction in the process of forming and movement.
Stress Analysis and Dissociation of Radial Tyre under Water Jet Impact
Authors: Song Shou Xu , Yu De Qiao , Cha Hui
Published: October 2014

A new method to recycle radial tyre is studied, using Ultra-High Pressure Water jet to cut the tread rubber. The dynamic constitutive model of radial tyre material is builded, fitting model parameters with least square method. And the stress distribution law and dissociation characteristics of rubber block under impact are studied by finite element analysis.Through the SEM observation of cross section, the relationship is preliminarily discussed between stress distribution and micro-morphology of fracture interface and dissociation pathways. The split Hopkinson pressure bar apparatus is used to obtain the dynamic response law of material in a wide range of Strain Rate. The experimental results show that viscoelasticity of the rubber material is not fully reflected from the perspective of the stress wave propagation. The rubber material has a brittle transition and eventually forming fine powder. And the experimentally measured material crushing threshold is found agreed well with the numerical simulation results. It provides important mechanical foundation for further research on the mechanical force desulfurization of material.
Overview of Time-Frequency Analysis Techniques in Vibration Signals of Rotating Machinery
Authors: Li Hong , He Qing , Zhang Zhao
Published: October 2014

There is very rich fault information in vibration signals of rotating machineries. The real vibration signals are nonlinear, non-stationary and time-varying signals mixed with many other factors. It is very useful for fault diagnosis to extract fault features by using time-frequency analysis techniques. Recent researches of time-frequency analysis methods including Short Time Fourier Transform, Wavelet Transform, Wigner-Ville Distribution, Hilbert-Huang Transform, Local Mean Decomposition, and Local Characteristic-scale Decomposition are introduced. The theories, properties, physical significance and applications, advantages and disadvantages of these methods are analyzed and compared. It is pointed that algorithms improvement and combined applications of time-frequency analysis methods should be researched in the future.
Numerical Simulation of Curing Deformation of Thermosetting Resin Matrix Composite Curved Structure
Authors: He Ji Lin , Ma Yun Rong , Li Dong , Tan Yao , Xu Lei
Published: October 2014

The evolutions of physical properties of composites during the curing process of the carbon fibre reinforced resin composite, such as density, modulus, coefficient of thermal expansion, specific heat capacity and thermal conductivity, were analyzed and those evolutions were introduced into the numerical simulation. The new approach to construct the curvilinear coordinate system by streamline equation of steady flow was proposed with the complex curved structure composite as the study object. By using the finite-element method and building the curvilinear coordinate system, the distribution of internal temperature, degree of cure, internal stresses and evolutions of physical properties during the curing process of the composite skin plate of a light aircraft wing were calculated. The deformation of the skin plate caused by the uneven distributions of temperature field and cure degree field, anisotropic thermal expansion coefficients and volumetric shrinkage of resin were calculated in the same model. From the numerical simulation results, it can be concluded that the curing process will be more reasonable and more accurate when the evolutions of physical properties of composites are adopted and the curvilinear coordinate system constructed by streamline equation of steady flow is fully applicable to finite element analysis of composite curved structure.
Surface Wave on a Viscous Fluid Film down an Inclined Uneven Wall
Authors: Wu Zheng Ren , Fu Guan , Song Zhao Xia
Published: October 2014

The paper is devoted to a theoretical study of nonlinear wave on a free-surface thin film down an inclined uneven plane. The problem is quite different from that of a viscous films flow along a smooth surface. Thus nondimensional variables are introduced in two ways according to the different relationship of the shallow water parameter and the topography parameter. Further, the zero-order and first-order stream function are derivated on the basis of perturbation method. Finally, the equations which govern the surface height of surface wave on a viscous fluid film down an inclined uneven wall are obtained.
Research on Simulation Modeling of Flight Aircraft Air under the Condition of Turbulent Flow
Authors: Jiang Yong Zhou , Lu Yong Ji , Ding Yan , Yu Xiao Yan
Published: October 2014

The flight process often in turbulence. Atmospheric turbulence causes flight bump, long time will cause damage to the aircraft structure fatigue. This paper establishes a model for atmospheric disturbance, flight simulation. Based on the aircraft through all kinds of atmospheric disturbance is studied. The use of embedded database and real-time simulation platform, built a run, in the PC machine can be used for dynamic model for real-time simulation of flight simulator.
In-Plane Behavior of BFRP Sheets Bonded to Damaged RC-Brick Masonry Walls with Opening
Authors: Lei Zhen , Wang Yong , Qu Jun Tong
Published: October 2014

FRP strength technique can increase the lateral strength of masonry walls, but the effect of the presence of pre-damage in the walls before retrofitted has not been studied. In this study, the experimental results from two half-scale RC-brick masonry walls with opening retrofitted with BFRP composite strips are presented. One wall was initially damaged in shear loading up to its maximum strength, and then repaired with BFRP sheets; another one was directly strengthened with BFRP sheets in the same strengthening configuration. All the walls were subjected to cyclic in-plane shear loading up to failure. Compared to the strengthened walls, the repaired masonry wall has almost the same failure mode and FRP strain rule, and slightly lower lateral strength and deformation capacity as well as energy dissipation capacity.
Study on TMD Measure to Suppress Wind-Induced Vibration of Power Transmission Steel Tower
Authors: Yang Jing Bo , Chen Zheng Qing , Hua Xu Gang
Published: October 2014

Wind-induced vibration can affect the safety of power transmission tower. Vibration suppression of the high-rise tower is of concern in engineering. Vibration of the tower is mostly the first-order bending modal and this vibration can be suppressed by the tuned mass damper (TMD). This paper developed a TMD vibration damping device using eddy current damper constituted by magnetic steel installed in the vibration mass and fixed copper plate. It is characterized by simple structure and easy installation, and is suitable for wind-induced damage prevention of transmission tower. Focusing on a quadruple-circuit on the same steel tube tower, a vibration reduction test on a real-scale tower conducted. The result shows that the damping ratio of the tower after installed with the TMD device will increase about 3%. The actual test result verifies the effectiveness of the eddy current TMD device.
Straight Beams Rested on Nonlinear Elastic Foundations – Part 2 (Numerical Solutions, Results and Evaluation)
Authors: Michenková Šárka , Frydrýšek Karel , Nikodým Marek
Published: October 2014

This paper presents numerical solutions of straight plane beam structures rested on an elastic (Winkler's) foundation. It is a continuation of our previous work (see Part 1 of this article) focused on practical applications and solutions including nonlinearities in the foundation (i.e. bilateral linear, bilateral linear + cubic, bilateral linear + cubic + quintic approximations and unilateral approximation for dependencies of reaction forces on deflection in the foundation). For solutions of nonlinear problems of mechanics (i.e. differential 4th-order equations), the Finite Difference Method (i.e. the Central Difference Method) is applied in combination with the Newton (Newton–Raphson) Method. Finally, in one example, linear and nonlinear approaches are solved, evaluated and compared. In some cases, there are evident major differences between the linear and nonlinear solutions.
Simulation Analysis of Sound Insulation for Urban Traffic Noise
Authors: Chen Yong Guang , Cai Wei Ming , Jian Su Xiong
Published: October 2014

The sound barrier is one of the effective and economical engineering facilities to control the urban traffic noise. The characteristics of urban traffic noise are analyzed both in time-domain and frequency-domain. Then the noise reduction theory of sound barrier is introduced in detail. The determination of the influence factors in insertion loss is researched emphatically. The main procedure of the acoustics design of sound barrier is also systematically studied. According to the main design process of the acoustics design of sound barrier, simulation confirmation is conducted by acoustics software to confirm the noise reduction performance of the barrier.
Study on Design Method of the Microstructure for Layered and Ring-Shaped Acoustic Cloaking Based on Bimode Metamaterial
Authors: Xiao Qian Jin , Zhang Xiang Dong , Qian Jia Chang , Chen Hong
Published: October 2014

The paper proposes a design method for the layered and ring-shaped acoustic cloaking based on BM. According to the theory of PM cloaking, physical parameters of the ring-shaped acoustic cloaking are given by theoretical design. Further, based on the features of microstructure of BM, the relationship between the parameters of each layer of microstructure of BM and the analytic expression of the physical parameters of acoustic cloaking made of BM is determined, and the design methods for microstructure of layered and ring-shaped acoustic cloaking are discussed, namely, radial equidistant layered design and radial non-equidistant layered design (i.e. equal sectorial angle layered design). At last, according to the radial non-equidistant layered design parameters of the ring-shaped acoustic cloaking, the microstructure model of the layered and ring-shaped acoustic cloaking is designed. The results of the study can serve as theoretical basis for actual production and application of acoustic cloaking.
Research of the Spread and Measurement of Urban Traffic Noise
Authors: Chen Yong Guang , Yang Yun Sheng , Jian Su Xiong
Published: October 2014

Study of the traffic noise has important role in the improvement of urban living environment. The source of the noise of road vehicle and the spectral features of urban traffic noise are analysed in the paper. Through the investigation and monitoring on two typical roads, the distribution law of traffic noise along both sides of the road is analysed and a theoretical basis for the control of traffic noise is provided.
Simulation System of Flight Maneuver Based on HLA
Authors: Chen Xiao Xu , Lu Ya Bing , Zhao Si Hong , Wang Qi
Published: October 2014

High Level Architecture is a software in 1995 USA DOD which is first introduced in the modeling and Simulation of the outline of the interoperability specification. based on which can generate the general technical framework of computer simulation system. The adhesive will complex the small simulation system into a requirements large one. In this paper, the technology framework based on the construction of aircraft, tactical maneuver simulation system has be built.
A Barycentric Interpolation Collocation Method for Darcy Flow in Two-Dimension
Authors: Wang Zhao Qing , Tang Bing Tao , Zheng Wei
Published: October 2014

A meshless, barycentric interpolation collocation method for numerical approximation of Darcy flows is proposed. The barycentric Lagrange interpolation and its differentiation matrices are basic tool to discretize governing equations, Dirichlet and Neumann boundary conditions. For Darcy flows in irregular domains, embedding the irregular domain into a rectangular, the barycentric interpolation collocation method can be directly applied. The resultant saddle-point systems come from combining the discretized governing equations and boundary conditions, such that we can deal easy with all kinds of boundary condition either regular or irregular domains. Some numerical examples are given to illustrate the accuracy, stability and robust of presented method.
Research on the Load on Cutter Head of Hard Rock Tunnel Boring Machine
Authors: Zhao Xiao Xu , Gong Ya Dong
Published: October 2014

Study on the load exerted on cutter head is very useful for the design and performance prediction of hard rock tunnel boring machines. A composite model based on smoothed particle hydrodynamics and finite element method was carried out using AUTODYN software to study the rock fragmentation mechanism of constant cross-section disk cutters in cutter head. The normal force, rolling force and side force on the disk cutters with different cutter radius were researched in the numerical simulation study. The results were verified by historical literature data. To obtain the distribution of the forces with different cutter radius, the loading of cutter head of a Ф5.75 hard rock tunnel boring machine were analyzed. The result shows that it is useful for cutter head’s design and its layout optimization.
Analysis of Ecological of Characteristic Time for Thermoacoustic Refrigerator by Double Acoustic Drivers
Authors: Chen Hao , Wu Feng , Wang Tuo , Lin Jie
Published: October 2014

Using the method of finite time thermodynamics, and quoting the ecology objective function to optimize the performance of the dual sound source driven thermoacoustic refrigerator regenerator. And Use the characteristic time to characterize the transducer effect in the thermoacoustic system in order to seek the optimal relationship between the characteristic time and ecology objective function. Numerical calculation results show that the impact of the relationship between ecological function and the characteristic time is parabolic curve, so there is an optimal characteristic time to maximize ecological objective function values.
Based on 3D Virtual Prototype Technology and Finite Element Analysis of the Optimization of the Automobile Front Axle
Authors: Yuan Heng Yi , He Ming Wang
Published: October 2014

The front axle is an important part of a car, directly affects the dynamic characteristics of car. Based on UG NX6.0 for automobile front axle parts 3D modeling, finite element analysis software ANSYS modal analysis was carried out on the front axle, and extract their first four order natural frequency and vibration mode shapes, the automobile front axle structure stress analysis and stress distribution nephogram of get parts. Analysis of the impact load condition and emergency braking conditions modal analysis, and further to fatigue analysis of the front axle bridge shell, for provide valuable reference data for the reasonable design of parts. For the kinetics of further research and improvement of front axle provides the theoretical basis, but also provides reference to the actual test.
Research on Ballast System of 1000t Crane Vessel
Authors: Deng Shu Zhang
Published: October 2014

To sail and work safely in different working conditions, the ballast system of a certain crane vessel is researched and designed because it’s strict with hull stability. According to the characteristic of the vessel arrangement, the concept of ring pipe type is adopted in the ballast system. The dual and single ring types of ballast system are designed, analyzed and comprised with each other respectively. Simultaneously, the normal materials of ballast system are analyzed, and the suitable material is selected.
Stability and Control of Tooling System for High-Speed Machining
Authors: Zheng Deng Sheng , Chen Jian , Tao D.F. , Lv L. , Wang Gui Cheng
Published: October 2014

Tooling system for high-speed machining is one of the key components of high-end CNC machine , its stability and reliability directly affects the quality and performance of the machine. Based on the finite element method, developing a 3D finite model of high-speed machining tool system, studying on the stability of the high Speed machining tool from the natural frequency by the method of modal analysis. Analysis the amount of the overhang and clamping of the tooling , different shank taper interference fit and under different speed conditions, which affects the natural frequency of high-speed machining tool system. Proposed to the approach of improving system stability, which also provides a theoretical basis for the development of new high-speed machining tool system.
Research on Control System of Rotary Inverted Pendulum Based on ARM
Authors: Liu Jia
Published: October 2014

In this paper, control system of rotary inverted pendulum based on ARM is designed, which is composed by mechanical section and control section. The system measures signal for variation of angle of radial arm and pendulum rod and transmits such signal to ARM control panel, after which control rate can be calculated through PID control algorithm. Inversion of pendulum rod can be controlled through rotation of the radial arm on a plane driven by an electric motor, and the pendulum rod can rotate on a vertical plane. Finally, MATLAB is used to conduct simulation for three parameters including proportionality coefficient (KP), integral coefficient (KI) and differential coefficient (KD), based on which ideal parameters are determined, stable control of pendulum rod inversion near equilibrium point is realized, and feasibility of control algorithm is verified.
A Probabilistic Model of the Interaction between a Sitting Man and a Seat
Authors: Grepl Jan , Frydrýšek Karel , Penhaker Marek
Published: October 2014

This article focuses on the biomechanical evaluation of the interaction between load forces to which a sitting man and the seat are mutually exposed. The load forces, which consider actual dispersion in the human population through histograms, are determined using a probabilistic method known as the Simulation-Based Reliability Assessment (SBRA). A simple flat model shows a basic and high-quality stochastic evaluation of all the forces that affect the man and the seat. The results and methodology can be used in many areas of biomechanics, ergonomics or industrial design.
Finite Element Analysis of Coating-Matrix Interface Crack
Authors: He Bo , Chu Sha Sha , Qi Guo , Sun Chang Qing
Published: October 2014

The finite element method combined with the singular element was adopted to study the effects of thickness ratio of the coating-matrix, elastic modulus ratio of the coating-matrix, and the ratio of ensile stress and shear stress on the coating top on the stress intensity of the interface crack on the coating-matrix. Through calculations, results show that elastic modulus ratio of the coating-matrix has little effect on stress intensity factor of interface crack, while the thickness ratio and the tensile stress and shear stress ratio on the coating top have a great effect on it, which should be controlled in the coating-matrix structure design.