bluuebunny/crossref_metadata_2025 huggingface dataset:
Enhancing Vibration Damping of Smarts Structures by Energy Transfer between Modes
Authors: Wang Zhen , Jean-Mistral Claire , Chesné Simon , Gaudiller Luc
Published: October 2014

In a context of embedded structures, the next challenge is to develop an efficient, energetically autonomous vibration control technique. Synchronized Switch Damping techniques (SSD) have demonstrated interesting properties in vibration control with a low power consumption. The damping attenuation can be improved thanks to energy transfer between a voltage source and the SSD circuit. Harvesting energy on a second structure can provide this voltage source but drastically complex the overall system. We propose here a new technique to enhance the classic SSD circuit due to energy harvesting. Our original approach consists in transferring energy between modes of a same structure: energy is harvested on non-controlled mode to increase the attenuation of a targeted mode. In this paper, we present theoretical analysis and numerical simulations of our energy-transfer architecture applied to an academic case, a free-clamped beam. Our electrical architecture called Synchronized Switching Damping and Harvesting (SSDH) is composed of a harvesting circuit (Synchronized Switch Harvesting on Inductor SSHI), a dc-dc converter (Buck-Boost topology) and a vibration modal control circuit (similar to a Synchronized Switch on Voltage SSDV). In a multi-sine excitation, an increase of the attenuation damping of 3.8dB with our new technique compared to classic SSDI is achieved.
Design Optimisation and Analysis of a Quadrotor Arm Using Finite Element Method
Authors: Bhatia Vishank , Karthikeyan R. , Ganesh Ram R.K. , Cooper Yashaan Nari
Published: October 2014

The structural analysis of quad rotor frame is important since it has to withstand the forces due to aerodynamics and gravitational force due to the mounted weights. Design optimization based on finite element analysis provides an efficient methodology to meet the desired objectives related to structural elements. In the present study, design optimization based on response surface methodology has been used to optimize the shape of the arm used in the quad rotor. The objectives considered for the study include minimization of Von Mises stress and total deformation. The goal driven optimization used in ANSYS WORKBENCH has been employed for the study and arm has been redesigned to meet the set goals.
A Novel Methodology to Assess the Relaxation Rate of the Intervertebral Disc by Increments on Intradiscal Pressure
Authors: Araújo Ângelo R. , Peixinho Nuno , Marques Pinho A.C. , Claro J.C.P.
Published: October 2014

The Intervertebral Disc (IVD) is subjected to several types of loading during daily routine events. However, the overloading on this structure induces higher Intradiscal Pressure (IDP), which could cause severe damage on its structure. This study describes a new approach to that allows monitorize and pressurize nuclear region of the IVD, with a cartilaginous endplate access, by the insertion of an external fluid, while a Motion Segment (MS-assembly composed by vertebra-disc-vertebra) is compressed at a physiological load. This methodology includes the use of a pneumatic structure that applies a certain pressure on the hydrostatic system, forcing a fluid to enter into the MS through a screw, with a drilled hollow along its entire length. Preliminary results indicated that this methodology presents high potential to efficiently pressurize the IVD, providing a useful tool to better understand the response of this structure under pressure.
Research on the Biodegradable Buffer PFFM
Authors: Chang Jiang , Li Guang , Wu Guang Hua , Fu Xiao Feng , Pang Yu Yan
Published: October 2014

The paper made a research on the process of a biodegradable buffer packaging material prepared mainly by corn straw fiber and starch. By choosing the appropriate adhesive, through a molding process, a buffer packaging material with good performance can be obtained. Factors affecting the properties of the PLA/corn straw Fiber Foamed Material (hereinafter referred to as PFFM) are mainly adhesives, starch content, agent quantity, auxiliary material and foaming temperature. A degradable foamed packing material was prepared.
Study on the Vacuum Drying Model of Perilla Leaf by Microwave Method
Authors: Chang Jiang , Xu Feng , Wu Guang Hua , Fu Xiao Feng , Li Guang , Pang Yu Yan
Published: October 2014

The drying rate is difficult to control for perilla leaf during the microwave vacuum drying process. Through scientific approaches, this paper made a research on the relationships between drying factors and drying rate, and established a kinetics model on microwave vacuum drying of perilla leaf. The model can predict the water content variations of perilla leaf during microwave vacuum drying, and provides a theory basis for packaging, storage and transportation for perilla leaf production.
Impact Toughness Influence on the Bending Properties of Rock Bolt
Authors: Li Zhong Wei
Published: October 2014

—Abstract: The use of high-strength rock bolt in the underground often occured brittle fracture in the threaded section, this is closely related to bolt material impact toughness. Tested the impact absorbed energy of four manufacturers of the yield strength of 500MPa rock bolt and the impact absorbed energy value ranging from 19J to 165J. Tested bending test of the bolt rod and threaded section that has a different impact absorbed energy, the results showed that: the impact toughness affects the cold bending of the rock bolt thread segment, when the impact absorbed energy value is less than 30J rock bolt thread segment cold bending poor; impact toughness has no obvious affect on the cold bending of rod.
Computer Model of Weld Formation during Submerged Arc Welding and Process Energy Balance
Authors: Tsvelev R.V. , Erofeev V.A. , Sudnik V.A.
Published: October 2014

A transient mathematical model of the submerged arc welding process with the hydrostatic statement description of its basic physical phenomena has been presented. Radiative heat transfer from the arc column to the surface of the cavity arc is adopted. The heat current flowing from the electrode layer of molten flux on the arc column to the arc cavity surface is taken into account. The energy balance is considered. A comparison between the calculated and experimental data has shown their good correspondence.
MAW Productivity Development and Reduction of its Harmful Effect on Human Organisms
Authors: Il’yaschenko D.P. , Chinakhov Dmitry A. , Gotovshchik Yu.M.
Published: October 2014

The article presents results of researches on manual arc welding efficiency development. It is proved that the arc welding inverter power source, compared with the diode rectifier, increases coefficient of transition of alloying elements into the weld joint; it also reduces the rate of alloying elements transition into slag and gaseous components and in addition reduces the harmful effects of welding on human organisms.
Structure and Properties of Al–Ti Multilayered Composites with Intermetallic Layers
Authors: Lazurenko Daria B. , Mali Vjacheslav I. , Shevtsova K.E.
Published: October 2014

In this paper growingtheintermetalliclayers at the interfaces of explosively welded titanium and aluminum plates have been investigated. It was shown that explosion welding was the efficient technology for forming multilayered stacks consisted of dissimilar materials. This method provided the firm joint formation between metallic plates. Heat treatment of explosively welded workpieces allowed obtaining the Al3Ti intermetallic phase at titanium-aluminum interfaces. Formation of intermetallic layer proceeded inhomogeneously in cross-section of the composite due to the structural particularities of interfaces and adjacent arias formed during the explosion welding process. The titanium aluminide growth ratedecreased corresponding to increaseof the intermetallic layer thickness. Intermetallic phase is notable for its high hardness and elasticity. Microhardness and Young’s module in the composite explosively welded and annealed at 640оС reached 7.5 GPaand 280GPa respectively.
Investigation and Modeling of the Process of Formation of the Pad Weld and its Microstructure during Laser Cladding by Radiation of High Power Fiber Laser
Authors: Turichin Gleb , Somonov V.V. , Klimova-Korsmik Olga G.
Published: October 2014

The article gives theoretical solution of the problem of powder particles heating and their transfer to the substrate, considering the impact of transporting gas jet incidence on the substrate. The article also describes the research of layer microstructure, deposited by high power fiber laser cladding, and result of analysis of the dependence metal properties from the transition-layer cladding mode.
Structure and Properties of AMg2M Alloy Joints Made by Argon Nonconsumable – Arc Welding and Friction Stir Welding
Authors: Poklaytsky A.G. , Klochkov I.N. , Motrunich S.I.
Published: October 2014

Studied are the structural peculiarities of joints on AMg2M alloy of 2 mm thickness made by TIG and FSW. Their mechanical properties and fatigue resistance characteristics at alternating axial loads with asymmetry ratio of stress cycle Rσ = 0.1 were determined.It is determined that the welded joints failure along the base metal at tension and have ultimate strength at 170 MPa level. Restricted endurance limits of the joints, made FSW, exceed corresponding indices of the joints, made by NCAAW, for 10-15% in 105 – 2·106 fluctuation cycle endurance range and make 90-95% from the values of this index for the base metal.
Structure and Mechanical Properties of Cu-Alloyed Cast Iron
Authors: Stepanova N.V. , Razumakov A.A. , Lozhkina Е.A.
Published: October 2014

The effect of Cu addition on structure and mechanical properties of the gray cast iron is studied. Copper is showed to affect the graphitization process. Copper content increase up to 6 ... 7 wt. % reduces the depth of the chill layer.With further increase of coppercontent the alloys tendency to chilling effectincreases.When the cast ironcontains from 0 to ~ 7% Cu, inclusions can’t be detected using only optical microscopy. In the cast iron with 14.7% Cu, distribution of inclusions has two peaks: 30 ... 40 ... 150 microns and 160 microns. Out-of-shape cupric inclusions of the size of ~ 1 micron are detected in the ledeburite cementite.Submicron inclusions are observed in the lamellar pearlite colonies. With increase of copper content up to ~ 7 wt. % cast iron hardness and microhardness of pearlite increases.
Surface Quality of the Fiberglass Composite Material after Milling
Authors: Yuanyushkin A.S. , Rychkov D.A. , Lobanov D.V.
Published: October 2014

One of the prevalent ways of machining is milling, however to obtain the high fiberglass composite surface quality is difficult because of its layered structure, high strength and low thermal conductivity characteristics. This leads to the need for milling technology which provides high-quality surface. Our experiments for milling of the fiberglass composite show that the surface roughness, as one of the quality criteria, to a large depends on cutting conditions, tool material and wear of the cutting edge determined by the bevel rear tool wear. To ensure of the surface quality of the composite material during milling recommended that the bevel rear tool wear does not exceed 0.35 mm, cutting conditions were the following limits: feed speed, 0.15 – 0.17 mm/cog, depth of the cut, 0.3 – 0.6 mm, cutting speed, 45 – 48 m/s and the cutting part of the tool is made of high strength tool materials such as hard metal VK3M.
Influence of the Longitudinal Excavations Layout on Stress Concentration Value in the Peripheral Rock Mass
Authors: Revuzhenko Alexander F. , Kazantsev Anton A. , Glazkov Yuri F. , Dortman Andrey A.
Published: October 2014

The article proposes an analysis of the various longitudinal excavations layouts in tunnel walls. The excavations are required for taking reaction forces when a ‘geokhod’ works. A computational model of the peripheral rock mass is presented. Calculations showed that the X-type layout of the longitudinal excavations is most acceptable for the given initial conditions.
The Technology of Production and Treatment of Materials in the Electric Field
Authors: Rodzevich A.P. , Gazenaur E.G. , Belokurov G.M.
Published: October 2014

The technical result of the method of production and treatment of materials in the weak constant electric current suggested in the given paper is the opportunity of regulating the physical and technical properties of materials. Treatment of materials in the electric field is a convenient and economically efficient method for producing a pure solid substance. The unit for producing and treating the materials in the weak non-contact electric field includes the experimental cell placed between two electrodes connected to the power supply through a voltage divider which is a number of elements connected by resistance in series which allows varying the voltage of the electric field in the experimental cell. The experiments demonstrated that the given technology allows growing mono-, micro-and whisker crystals of a number of inorganic salts (azides, halogenides of silver and alkali metals) having the prescribed size, reproducible physical and technical characteristics, regulated defect structure, long storage life (at least 6 months).
Bulk Nanostructured Ni3Al Intermetallic and Ni3Al-Base Alloy
Authors: Ovcharenko V.E. , Psakhye Sergei Grigorievich , Boyangin E.N.
Published: October 2014

We show here that Ni3Al compound which is widely used as the base metal for advanced multipurpose hot-resistant alloys may be efficiently bulk nanostructured for improving its physical and strength characteristics. Developing the nanostructured component in the bulk of the intermetallic compound is achieved by plastic deformation of an SHS product during its synthesis and crystallization under conditions of thermal explosion of nickel/aluminum powder mixture of stoichiometric composition. It was shown that the nanosize component is formed on the basis of intermetallic Ni3Al synthesized by SHS under hot forging conditions from nickel/aluminum powder mixed with an inert binder component. Developing the nanosize structural components improves strength of the intermetallic alloy.
Structure and Properties of Laser-Welded Joints from High-Strength Steels
Authors: Berdnikova O. , Sydorets V. , Alekseienko T.
Published: October 2014

Presented are the results of investigations of peculiarities of structure formation and phase composition in a metal of laser-welded joints from high-strength steel 14KhGN2MDAFB. The analytical evaluations of strengthening along a welding zone and crack nucleation stresses in the places of stress concentrators determined using the experimental data that a structure being formed provides for uniform level of mechanical properties and crack resistance of the welded joints.
Determination of Parameters of Roller of Wave Transmission with Intermediate Rolling Bodies with Hollow Shaft for Geokhod
Authors: Timofeev V.Yu. , Aksenov V.V. , Galjamova J.I.
Published: October 2014

The paper presents a calculation of the roller minimum length based on the contact stresses at work on the transfer roller surface and separator.
About the Structural Transformation of Void during Radiation Treatment of the Material
Authors: Markidonov A.V.
Published: October 2014

Restructuring process of vacancy voids under the influence of post-cascade shock waves is studied by molecular dynamics method. It is shown that depending on the time gaps, which generate waves, voids can either be combined into a single complex, or break up into separate parts.
Control of Structure and Properties of Welded Connections of Alloy Steels by Application Highly Concentrated Pulse Energy Actions
Authors: Grigorieva A.A. , Saraev Yu.N. , Bezborodov V.P.
Published: October 2014

We appraised welding modes influence on corrosion resistance of welded joints of the alloyed steels in this paper. Influence of frequency characteristics of the current on structure steel welded joints obtained by stationary modes and pulse change of their power parameters is investigated. It is established that at reduction of current frequency the structure is crushed. The conducted researches have shown that at use of pulse welding mode the mechanism of corrosion interaction of welded joints of low-alloy steels in hydrochloric acid changes: instead of intergranular corrosion proper to joints after a stationary mode pitting corrosion occurs.
Justifying a Method of Balancing Crank-and-Rod Mechanism of Mining Roadheader
Authors: Burkov P.V. , Burkova S.P. , Timofeev V.Yu.
Published: October 2014

The authors prove the importance of research aimed at designing crank-and-rod mechanism of a roadheader. Advantages, design and technological characteristics of a roadheader feeder are determined. The authors suggest technological solutions of crank-and-rod mechanism design.
Formation of Surface Layer of Cobalt Chrome Molybdenum Powder Products with Differentiation of Laser Sintering Modes
Authors: Saprykina N.A. , Saprykin A.A. , Matrunchik M.S.
Published: October 2014

The paper presents results of research on a method of determining a geometric condition of a sintered surface using an instrumental digital microscope. The results of experimental studies of effects of laser irradiation technological modes on roughness of the cobalt chrome molybdenum powder DSK-F75 sintered layer are presented. Differentiation of modes of product surface and its internal volume formation into rough, semi-finishing and finishing are proposed.
Modifying Charge Input Optimization in Arc Surfacing with the Controlling Magnetic Influence
Authors: Peremit’ko V.V. , Kuznetsov V.D. , Sokol A.N.
Published: October 2014

The hydrodynamic processes modelling in the weld pool under the influence of the electromagnetic bulk force was carried out. For the approximation of the model equations the finite difference method was used. The resulting system of linear algebraic equations was solved by simple iteration. The finding served the basis for determining the optimal scheme supply of powder material adding for the modification and alloying of the weld (build-up) metal in the presence of an external magnetic field.
Multiple Service Life Extension of Mining and Road Machines’ Cutters
Authors: Prokopenko Sergey A.
Published: October 2014

Summary: Modern mining and road machines in all countries of the world are equipped mostly with expendable tangential rotary cutters which results in high consumption of metal and high costs of rock breaking. A reusable cutter for mining and road machines was designed and tested. The article describes the procedure and results of the cutter tests in the Kuzbass mines. The tests showed high technical and economic efficiency of the innovative cutters.
Performance Evaluation of Al2O3 Powder Dispersion by Bead and Ball Mills
Authors: Belousova N.S. , Goryaynova O.A. , Melnikova E.V.
Published: October 2014

In this paper the results of alumina aqueous suspension disaggregation with the help of bead and ball mills are shown. The changing of maximum particle size for50 wt. % and 90 wt. % of powder (from lowest to highest size) in suspension dispersed by a bead mill for one hour and ball mill for 48 hours was fixed. In order to achieve powder parameters given by the manufacturer disaggregating process sets was defined.
Plastic Deformation Macrolocalization. Local Stresses and Fracture in Ultrafine Grain Titanium
Authors: Danilov Vladimir , Shlyakhova Galina , Semukhin Boris
Published: October 2014

The process of plastic deformation in ultrafine grain titanium is considered. Using the methods of speckle photography and X-ray diffractometry, the distributions of local strains and of local elastic distortions were examined for the test sample work. It is shown that the method of atomic-force microscopy can be used effectively for qualitative and quantitative assessment of ultrafine grain material structure.
On the Pressure of Loose Material on the Bottom and Walls of a Drum
Authors: Kazantsev Anton A. , Klishin S.V. , Revuzhenko Alexander F.
Published: October 2014

Janssen problem of the loose material pressure on the drum bottom and walls was numerically investigated by discrete element method in 3D coordinate system. Dry friction of granulated material particles was taken into consideration as well as friction of drum walls. The effect of a filling process on the stress state of medium was demonstrated.
Synthesis of Transparent Conductive Coating In2O3:Sn Films from Film Forming Solutions
Authors: Kuznetsova Svetlana A. , Kozik Vladimir , Malchik Aleksandra
Published: October 2014

Materials based on films In2O3:Sn found commercial use as optical materials because of their high reflectance in infra red radiation and transmittance in visible spectrum. This paper investigates effects of treatment of glass substrates with acid (СН3COOH), basic (NaOH) etchants and an etchant having oxidation ability and acidic properties (chromic mixture) on optical properties of films In2O3:Sn proposed for solar cells and LEDs. The resulting films are characterized by high transparency 75-90% in visible spectrum for the values ​​of refractive index 1.82-1.90. Substrate treating effect on thickness, resistance and transparency of the films is described. Morphology and optical properties of the films were studied by three-dimensional non-contact profilometry, spectrophotometry and ellipsometry.
Performance Assessment of Carbide Tooling under Thermal and Loading Conditionds
Authors: Nekrasov R.Yu. , Starikov А. A. , Korchuganov M.A.
Published: October 2014

A continuous increase in intensity of metal working operations in mechanical engineering, changes in the structure, functional capabilities and cost of production facilities, and ever-growing use of high-strength materials, that generally have poor workability, require finding a package approach both to investigations of cutting tool capacities and to optimization of machining operations to achieve maximum technical and economic efficiency in operating automated manufacturing equipment and CNC machines.
Modelling of Welded Joint Geometry in Sheet Metal Welding
Authors: Pavlov N.V. , Kryukov А.V. , Zernin Е.A. , Polischuk V.A.
Published: October 2014

The article considers adapted dependence of weld sizes on weld dimensions and impulse electrode wire feed parameters in sheet metal welding. Comparative analysis of test and calculated data for a weld size showed the model adequacy. Further on they were used for developing a computer application “Calculation of sheet metal weld dimensions” which allows to predict the form of a weld in impulse wire feed welding.
Formation of Metal–Polymer Composite on Titanium Alloy Surfaces
Authors: Klimenov Vasily A. , Zaitsev Konstantin V. , Borozna Veheslav Yu.
Published: October 2014

The work surveys the possible formation of a polymer composite layer on titanium alloys using ultrasonic treatment. The results of the formed composite layer research obtained by measuring a friction rate and analyzing wear slots are provided, properties of surface layers and special features of their wearing process have been investigated.
Cyclone with Controlled Parameters and Self-Emptying Bin for Air Dedusting in Machine Building Plants
Authors: Meskhi B.Ch. , Buligin Y.I. , Alexeenko L.N.
Published: October 2014

Efficiency of the dedusting of flue gases of the technological processes is reached at the expense of the new constructive solution of the cyclonic device in which possibility of the regulation of its geometrical parameters depending on properties and characteristics of the air-and-coal environment is provided. Results of pilot studies are presented, the engineering calculation procedure and a choice of the sizes of such devices is developed
Research of Stress Field Distribution in FCC-Single Crystal Samples in Compression
Authors: Alferova E. , Lychagin D. , Chernyakov A.
Published: October 2014

.Theoretical distribution of a stress field in a sample in the form of a rectangular parallelepiped in compression for an isotropic material was calculated using the method of finite elements. Calculations showed that the highest stress is observed at the top and front edges of a sample. There are areas of the tension stress on vertical edges in the area of sample tops. Shift anisotropy was determined by imposing of the distributed tension field in a sample on FCC crystal of a certain crystallographic orientation.Change of shift symmetry in single crystals for different crystallographic orientations of a compression axis was considered. It was established that a shift fragmentation in the parallel octahedral planes in the conditions of plastic deformation determines the process of low-symmetric shift deformation and maintenance of higher single crystal pseudo-symmetry. Connection of the obtained results and test data on heterogeneity of plastic deformation of nickel and aluminum single crystals is discussed.
Testing of Metallurgical Equipment on Contact Strength and Wear Resistance
Authors: Malushin N.N. , Valuev D.V. , Valueva A.V. , Serikbol A.
Published: October 2014

The results of accelerated testing machine and mechanism parts metallurgical equipment such as bodies of rotation on the wear resistance and contact strength developed installation, showing promising applications for the production of mill rolls all weld metal.
Russian Machinery Producing Industry Holdings: Organizational Structure, Corporate Social Responsibility and Event Management
Authors: Lukianova N.A. , Chibir E.V. , Kotik E.I.
Published: October 2014

The recent growth of the Russian machinery producing industry requires analyzing organizational architecture of those large scaled and high-tech enterprises. Holding structure, in this case, seems to be the most effective one. Different types of existing holdings allow selecting a suitable organizational structure concerning the needs of organization and effectiveness criteria. Moreover, holding structure gives a range of advantages for subsidiaries including wider possibilities in image providing, CSR initiatives implementation and special events supporting. In the article the authors analyze the types of CSR provided by the leaders of the Russian machinery producing industry, social responsibility of the economy sector and give the recommendations for further development of the segment of socially oriented initiatives.
Kinetic Study of the Effect of Plasticity and its Role in Stress Relaxation in the Weld Speed Steel during the Martensitic Transformation
Authors: Malushin N.N. , Valuev D.V. , Valueva A.V. , Serikbol A.
Published: October 2014

It is shown that in the weld metal of the type of high-speed steels observe the effect of kinetic plasticity and he owns a defining role in stress relaxation. It is shown that the kinetic effect of plasticity can be used to control the stress in the weld details.
Russian Coal Industry Amid Global Financial Crisis in 1998 and 2008
Authors: Solovenko I.S. , Trifonov V.A. , Nagornov V.I.
Published: October 2014

The article presents a comparative analysis of causes and content of problems in Russian coal industry in recent years of financial and economic crises. Both general and specific features of the coal industry crisis state in 1998 and 2008 are shown. Both negative and positive aftermaths of crises in the mining industry are analyzed. The authors identify trends and prospects of Russian coal industry development.
Bankruptcy Risk Management of a Machine Builder
Authors: Telipenko Elena , Zakharova Alexandra
Published: October 2014

The article presents the basic stages and results of the work with the decision support system in the process of risk management of bankruptcy by the example of a machine builder. Application of the suggested system allows solving four main tasks in the process of risk management of bankruptcy: selection of problem ratios; determining the bankruptcy risk level; generating and selecting alternatives for the problem ratios improvement; evaluating the economic efficiency of the chosen alternatives.
Increase of Economic Efficiency of Machine Building by Application of Reconditioning Technologies
Authors: Bushma O. , Dolyanovskaya O. , Khaskin V.
Published: October 2014

Tendencies of current development of science and technology as well as crisis phenomena of the last years showed that the problems of energy saving and conservation of natural resources refer to the most relevant issues of machine building economy. One of the ways for solving of such problems is extension of a service life of the parts of machines and mechanisms. Various reconditioning technologies are used for this and present work is dedicated to investigation of prospects of their commercial application.
Study Cracking Large Forgings of Low Carbon Steel Grade ST52, 3N Pressure Treatment
Authors: Valuev D.V. , Valueva A.V. , Serikbol A.
Published: October 2014

The paper presents an electron-microscopic analysis of structure, phase and stress-strain state of forging material. It was found out, that dislocations in ferritic grains and pearlite layers of forgings, cracked after manufacturing processes are half as large against those in standard material. Metal in this state is characterized by an increased concentration of lamellar sulfides. It is also stated that disadvantageous structural state is formed due to high concentration of carbon which causes metal over-heating both when forming and in final heat treatment.
Selection Criteria Parameter Thermal Cycle during Surfacing Heat Resistance High Hardness Parts of Metallurgical Equipment
Authors: Malushin N.N. , Osetkovskiy Vasiliy L. , Valuev D.V. , Valueva A.V. , Serikbol A.
Published: October 2014

In the paper criteria of thermal cycle parameterization for surfacing of metallurgical equipment parts with heat-resistant steels are proposed.
Computerised Decision-Making Support System Based on Data Fusion for Machinery System’s Management and Maintenance
Authors: Stefaniak Pawel , Zimroz Radosław , Bartelmus Walter , Hardygóra Monika
Published: October 2014

In the present fast-paced world of business in a highly competitive marketplace, the focus on increasing the efficiency of business processes seems to be a reasonable challenge. For this reason in order to optimize production costs, there is an increasing trend toward maximising the use of the operational capabilities of the equipment – technological line components – with the prevention of failure events and their consequences in the form of costly repairs or replacements. A condition-based maintenance (CBM) approach allows to globally monitor, maintain and control operation of the whole complex of equipment and/or processes. The CBM effectively supports decision-making process concerning their further use or determination of the optimum repair/replacement schedule. The presented decision support system is dedicated for an underground copper mine, where the network of belt conveyors is a critical part of the production process. Due to complexity of mechanical system, harsh mining environment and presence of many degradation factors, development of the effective CBM system seems to be justified. It requires the integration of data from different sources, adaptation of advanced data mining techniques, procedures or various diagnostic methods. Because of the multidimensional nature of diagnostic data and diversified technical configurations of the facilities, it was necessary to develop and implement multivariate analytical models based on artificial intelligence techniques. Consequently, it allows to achieve improvement of efficiency of transportation network and reduction of repairs costs and unplanned breakdowns. In this paper we will briefly refer to all these issues.
Identification of Factors Causing Damage to Conveyor Belts during the Transportation of Coal
Authors: Škrabuľáková Erika , Marasová Daniela , Tomašková Marianna , Grendel Peter
Published: October 2014

The paper deals with the identification of the factors that cause damages of conveyor belts at coal quarry. On the base of statistical processing of the data obtained from 4 open-pit mining sectors the most important factors causing time-outs are identified. The cause-effect relation is demonstrated on the example of bipartite graph where the higher valence of each out-vertex signalizes the greater importantce of the considered factor to cause shatter effects. In order to avert the negative effects, break-downs and increase the reliability of conveyor belts a monitoring system for these belts is proposed.
Implementation of the Concorde Transport System in the Production
Authors: Kráľ Ján , Kráľ Ján , Rjabušin Adrián , Harsányi Lórant , Madáč Kamil , Melko Jaroslav
Published: October 2014

This article deals with toolpath analysis and optimization of CNC machines. There are many logistical programs used for searching of optimal toolpath between specified points. One of those logistical systems is CONCORDE. This system we have applied into CAD systems like Pro Engineer Creo E and CATIA V5. The results from comparision of each method used in mentioned CAD systems are presented in the end of this article.
Influences of Surface Determination for Measurements Obtained by Industrial Computed Tomography
Authors: Tóth Teodor , Végh Alexander , Dovica Miroslav , Živčák Jozef
Published: October 2014

At present emphasis is placed on input or output control of products in the manufacturing process. One of the criteria is the dimensional analysis or porosity analysis of products. In the case that products are of complicated shapes, or measurements are to be taken in places which are not accessible to standard measuring devices (manual measurements, coordinate measuring machines) the use of computed tomography is one of the possibilities for obtaining the desired dimensions. These technologies work with digital data and therefore the surfaces which are to be assessed must be created on the basis of determined criteria. Surface determination is one of the most important settings during the evaluation of the visual shape (state) of a surface and assessing dimensions. During such evaluation this is the main parameter which globally influences the precision of the obtained data. In the case of an unsuitably determined surface the obtained results can vary from reality even by several tenths of a millimeter depending on the scanned object and the scanning conditions. The conveyor belts are composed of two or more materials with different densities, such as rubber and textile fibers. In cooperation with Faculty of Mining, Ecology, Process Control and Geotechnology is tested and evaluated the effect of the impactor with various energy into conveyor belt. The correct surface determination for selected material is necessary to evaluate the dimensions, the damage and pores. The article deals with the impact of surface determination on the result of a measurement.
Application of Reverse Logistics Processes in Belt Conveying
Authors: Husáková Nikoleta
Published: October 2014

Reverse logistics is very interesting part of eco-logistics, application part of logistics. It creates conditions for various applications and also for various subjects. One form of application is connection of reverse logistics and processing of used wear conveyor belts. Conveyor belts present one of the most important parts of belt conveying and their lifetime is limited, for example by breakdowns, damages, etc. So, using of reverse logistics processes affords facilities for producers and users of conveyor belts at the direction of material saving and also saving of costs.
Straight Beams Rested on Nonlinear Elastic Foundations – Part 1 (Theory, Experiments, Numerical Approach)
Authors: Frydrýšek Karel , Michenková Šárka , Nikodým Marek
Published: October 2014

This paper presents theory, experiments and numerical approaches suitable for the solution of straight plane beams rested on an elastic (Winkler's) foundation, including nonlinearities. The nonlinear dependence of the reaction force on displacement in the foundation (i.e. the experimental data) can be described via bilateral linear or bilateral linear + cubic or bilateral linear + cubic + quintic approximations, or by unilateral approximation (i.e. by using the Least Squares Method). These applications lead to linear or nonlinear differential 4th-order equations. For solutions of nonlinear problems of mechanics, the Finite Difference Method (i.e. the Central Difference Method) and boundary conditions are applied. The solution and its evaluation is performed in second part of this article.
The Characteristics of Static and Dynamic Mechanical Properties of NEPE Propellant
Authors: Gao Yan Bin , Chen Xiong , Xu Jin Sheng , Hu Shao Qing
Published: October 2014

In this paper, the static and dynamic mechanical viscoelastic behavior of NEPE propellant are studied. Under static conditions, five samples were subjected to constant-strain-rate monotonic loading with five different loading rates at room temperature. The dynamic mechanical analysis was employed for measurements of temperature and frequency dependence of the NEPE propellant by mean of BOSE-DMA-ELF3200 in frequency range from 1Hz to 16Hz. And get the dynamic mechanics temperature spectrum In the low temperature region, a single relaxation is observed in loss modulus-temperature Curves, which is glass transition relaxation. The results showed that NEPE propellant showed rate dependence and the same mechanical properties in the lower temperature and higher frequency.
Analysis of the Deterioration of Harmonic Local Irregularity on Locomotive Wheel-Rail Vertical Force
Authors: Chen Di Lai , Liu Jian Xin , Du Kai Jun , Wang Yan
Published: October 2014

By the MATLAB software the article simulated the local irregularity, the new harmonic excitation superimposed on the initial harmonic to simulate track settlement deterioration, the new uplift excitation superimposed on the initial harmonic to simulate track raised deterioration, as the locomotive model external excitation, using the SIMPACK multi-body dynamics simulation software to analyze the influences of the deterioration of harmonic local irregularity on locomotive wheel-rail vertical force, on the basis of the locomotive wheel-rail interaction dynamics index by the locomotive vehicle dynamics theory. The simulation results show that when the deterioration of harmonic local irregularity occurs, even if the amplitude of deterioration is small, which will cause serious deterioration of wheel-rail dynamic response and strong shock and vibration of wheel-rail .The larger amplitude of harmonic local irregularity, the greater of the maximum wheel-rail vertical force. When deterioration of the amplitude exceeds a certain value, the maximum of the wheel-rail vertical force exceedes the limit, which will cause derailment. The wheel-rail dynamic interaction increases with the speed increasing. At the same speed (such as 120km/h), harmonic local irregularity settlement deterioration compareing to harmonic local irregularity raised deterioration, the maximum of the wheel-rail vertical force increases 14.4%. Therefore, local irregularity deterioration or the speed of the locomotive should be strictly controlled.
Probabilistic Modeling of Fatigue Damage Accumulation under Spectrum Loading
Authors: Chen Xian Min , Dui Hong Na
Published: October 2014

A probabilistic methodology for modeling fatigue damage accumulation and fatigue life under variable amplitude loading is proposed in this paper. With probabilistic modifications, the calculative consistency between fatigue damage and life is achieved in the model and the load sequence effects are properly accounted for variable amplitude loading. This damage model overcomes the inherent deficiencies in the linear damage accumulation rule but still preserves its simplicity for engineering application. With Monte Carlo sampling method, numerical verification of this model is conducted under two-level spectrum loading. The predicted probabilistic distributions of fatigue life are validated by the fatigue tests on Al-alloy straight lugs.
Dynamic Analysis of Functionally Graded Euler Beam with Elastically Restrained Edges
Authors: Zhao Jun Feng , Fang Jing , Li Yao
Published: October 2014

Free vibration of functionally graded materials (FGMs) Euler beam with elastically restrained edges is investigated. The material properties of the FGMs beam vary continuously in the thickness direction according to the power law form. The neutral axis site of the FGMs beam is determined by the static equilibrium condition. The governing equation and boundary conditions are found by applying the Hamilton’s principle. The linear combination of a Fourier cosine series and auxiliary Legendre polynomial function is used to obtain the natural frequencies of the FGMs beam. The effects of the rotational spring stiffness, the translational spring stiffness and the gradient index on the natural frequencies are discussed and analyzed for different material properties and different boundary conditions, indicating that the frequencies are sensitive to the gradient variation of material properties and the spring stiffness.
Influence of Intermediate Course Gradation Type on Anti-Fatigue Performance of the Asphalt Pavement Structure
Authors: Sun Zhao Hui , Chen Li Guang , Yang Guo Feng , Yu Bao Yang
Published: October 2014

Three grading types of asphalt mixture are designed and respectively placed in intermediate course of asphalt concrete pavement with a typical semi-rigid base layer, the pavement structure model is established by the application of finite element software, the tensile stress at the bottom of intermediate course is analyzed under the wheel pressure of 1.5MPa, the finite element calculation results are led to the fatigue analysis software nSoft, the fatigue analysis results of intermediate course materials are obtained. The results show that the design gradation AC-20 mixture has excellent fatigue resistance in the pavement structure layer.
Fiber-Optic Distributed Vibration Sensor for Pipeline Pre-Alarm
Authors: Lin Wen Tai , Lou Shu Qin , Liang Sheng
Published: October 2014

Pipeline security is very important in oil and gas transportation. Traditional technology such as negative pressure wave detection, acoustic detection doesn’t match the need of pre-alarm. A fiber-optic distributed vibration sensor (FDVS) is proposed and investigated. It is found that the FDVS has the advantages of long sensing distance, high spatial resolution, high sensitivity, high reliability, etc. According to calculating the time delay of the two MZIs , the vibration can be located.
Simulation and Prediction Method of the Fatigue Cracks Life for Remanufacturing Shaft Parts
Authors: Feng Yan , Song Shou Xu , Ke Qing Di
Published: October 2014

Combining the method of finite element analysis with fatigue life prediction, fatigue cracks on the shaft parts is analyzed with cyclic loading. Analyzing the shafts with different sizes of cracks in different locations, a simulation modal is established. Informed by analytical and numerical simulation method, the crack formation and propagation life could be calculated. With considering the relationship of "Frequency - crack - fatigue life - remanufacturing ", the remanufacturability of the shaft parts might be evaluated based on service condition. And in this paper, a more convenient way to detecting and predicting the fatigue cracks on shaft parts is given.
The Research on Post Rolling of Aerodynamic Characteristics Numerical Simulation of Flow Field
Authors: Wang Qi , Zhang Jing , Ming Ming , Chen Xiao Xu
Published: October 2014

In this paper, according on post rolling maneuver and the flow field, we build a CFD analysis method about momentum source model flow field and aerodynamic characteristics. Preliminary analysis of the numerical has be finished to contrast the difference of post rolling maneuver. The changing law of aerodynamic force, aerodynamic torque variation and the focus position have be given.
Kinematics and Dynamics Simulation of L-10/7 Piston Type Air Compressor with Double Actions
Authors: Chen Min , Liu Xiao Xu , Zhang Jie , Guo Cui Xia
Published: October 2014

The virtually assemble model of the L-10/7 piston type air compressor with double actions was established under SolidWorks software. The kinematics and dynamics simulation of compressor’s crank-link mechanism were done by SolidWorks Motion, and the main results of simulation were given out, the results coincide with the date of design calculate. It can be used as the foundation for stress calculation and optimization design of the air compressor.
The Transmission Design and Production of Cylindrical Cam and Gear Joint Transmission Reducer
Authors: Dong Ming Wang , Yang Ting Ting , Wu Lin
Published: October 2014

Design a kind of reducer, the first stage transmission is a cylindrical cam, the secondary stage transmission is a gear transmission. Multistage transmission of the reducer has carried on the design calculation and checking. On the basis of the lateral cylindrical cam lateral transmission mathematical model, conducted the spiral curve analysis and calculation with numerical analysis software MATLAB. Import the spiral curve data into SOLIDWORKS to complete the 3D modeling of cylindrical cam. According to the structural design of cylindrical cam, complete reducer machine design and virtual assembly of gearless reducer. The stress analysis was carried out on the cam disk with the ANSYS Mechanical Analysis Module of SOLIDWORKS, designed to meet the working conditions. Conducted physical development based on CAD and CAE. The result showed that the design was fast and effective, significantly shorten the production cycle.
Research on the Protection of Forward-Facing Cavity on the Flow Field of Low Total Pressure Opposing Jet
Authors: Lu Hai Bo , Han Leng
Published: October 2014

This paper focus on the detailed influence of forward-facing cavity on the opposing jet. The flow field of a hemisphere nose-tip with the combined configuration was simulated numerically and the surface heat flux distribution was obtained. The numerical results show that a suitable cavity is helpful for the opposing jet. With the same total pressure, the single opposing jet even can’t form a stable flow field and there is no cooling effect.
A Posterior Model Reduction Method Based on Weighted Residue for Linear Partial Differential Equations
Authors: Sha Jie , Zhang Li Xiang , Wu Chui Jie
Published: October 2014

This paper is concerned with a new model reduced method based on optimal large truncated low-dimensional dynamical system, by which the solution of linear partial differential equation (PDE) is able to be approximate with highly accuracy. The method proposed is based on the weighted residue of PDE under consideration, and the weighted residue is used as an alternative optimal control condition (POT-WR) while solving the PDE. A set of bases is constructed to describe a dynamical system required in case. The Lagrangian multiplier is introduced to eliminate the constraints of the Galerkin projection equation, and the penalty function is used to remove the orthogonal constraint. According to the extreme principle, a set of the ordinary differential equations is obtained by taking the variational operation on generalized optimal function. A conjugate gradients algorithm on FORTRAN code is developed to solve these ordinary differential equations with Fourier polynomials as the initial bases for iterations. The heat transfer equation under a potential initial condition is used to verify the method proposed. Good agreement between the simulations and the analytical solutions of example was obtained, indicating that the POT-WR method presented in this paper provides the most effective posterior way of capturing the dominant characteristics of an infinite-dimensional dynamical system with only finitely few bases.