Moscow State University of Mechanical Engineering
Recent publications
Nowadays, the methods of robotic assembly of cylindrical joints are popular. However, before assembling, pegs and sleeves need to be adjusted. In practice, if there is a significant misalignment of the position of the shaft and sleeve, seizure or deformation may occur during the assembly process. This article proposes a method for determining the shaft position and sleeve using a force-torque sensor. Creating a three-point contact position is estimated using the force-torque sensor. Experimental setup based on an ABB IRB-140 industrial robot with an IRC5 controller, coupling parts with a gap 0.04 mm the effectiveness of the proposed method is confirmed. Building the structure of the system of an adaptive algorithm for controlling a robot with a force-moment sensor, which recognizes contact situations, will allow reliable assembly of precision joints and prevent jamming of parts during the process of pairing. In this work, equations are obtained that connect the parameters of the position and orientation of the connected part with the information issued by the force and moment sensor of the assembly robot with three-point contact.
Industry X.0 is the new paradigm that is the driving phenomenon in the process of making things and the new method in which they are produced. In this work, we attempt to fabricate ceramic layer reinforced metal matrix composite (MMC) of AISI 316L by a two-step laser process. The SiC-Ni-Ti layer on AISI316L serves to improve wear properties. The reinforcement of SiC-Ni-Ti on AISI316L modified the phase structure and microstructure. Coatings of metal-ceramic powders of 40% SiC-40%Ti-20% Ni and 60% SiC-30%Ti-10% Ni was preplaced on 316L specimens. High power laser was used to irradiate the preplaced coatings to form MMCs of metal-ceramic particles. The composition of the MMC layer was studied by using optical emission spectroscopy (OES) and its microstructure of the MMC layers, phase analysis and its elemental analysis were characterized by optical and scanning electron microscopy (SEM), X-ray diffractometry, and image analyzing techniques, respectively. The formation of non-uniformity of coating thickness, microporous and crack formation at layer of MMC, revealed that a higher percentage of ceramic particles present in the MMC layer entails a particular disadvantage. The results confirmed the high hardness of the surface due to particle refinement with dispersion of hard SiC particle and precipitation of Cr2C3/Fe2Si in the matrix that results the improved wear resistance of laser clad material.
The simulation of the process of heat propagation in the NbN film during the passage of a current pulse through it was carried out on the basis of an inhomogeneous two-dimensional equation of heat conduction. The initial-boundary value problem for longitudinal section of the film is solved numerically, and the analysis of heat transport in the system contacts-film-substrate-thermostat is carried out. The temperature evolution of the film cross section from the onset of the pulse to temperature leveling is visualized. It is shown that the contact material (beryllium bronze) provides efficient heat removal from a superconducting film in a resistive state when a high-density current flows through it. The proposed modeling method and contact material can be used to study other metal or semiconductor films.
The structural parameters of the mixing chamber of a pavement recycling machine affect the mixing behavior of an asphalt mixture. Most of the existing studies have used spherical particle models to analyze the mixing behavior, and it is difficult to truly understand the mechanical properties of asphalt mixtures in the mixing chamber. In this study, the discrete element similarity theory and dimensional analysis method were used to establish an engineered asphalt mixture particle model, and the validity of the model was verified by conducting a slump test. Based on these test results, the discrete element method was used to analyze the mixing behavior of the asphalt mixture, and the effect of the structural parameters of the mixing chamber on the mixing time of the asphalt mixture was investigated. The experiment was designed using the orthogonal test method, and a regression model was established based on the experimental data. The PSO algorithm was used to optimize the structural parameters of the mixing chamber. The results show that the mixing time of the coarse aggregate is reduced by 19.31%, the mixing time of the fine aggregate is reduced by 36.36%, and the mixing time of the powder is reduced by 33.33%.
Zirconia-Alumina composite coatings have been extensively used in the field of tribology applications. Particularly, the partially stabilized zirconia has been employed in the recent years due to the combination of high hardness and chemical stability at aggressive environment. To the best of the knowledge, there is a lack of literature pertaining to the comparative evaluation on the frictional-wear behavior of partially stabilized Zirconia-Alumina composite (PSZAC) and fused zirconia-Alumina coating (FZAC). Hence, the present article aims to evaluate the frictional-wear behavior of PSZAC and FZAC coatings on Aluminium-Silicon (Al-Si) alloy engineered using the atmospheric plasma-spray technique. Tribo-parameters like Applied load (10 N, 20 and 30 N) and sliding velocity (0.5 m/s, 1.0 m/s and 1.5 m/s) have been varied during the dry sliding wear measurement. Scanning Electron Microscopy (SEM) reveals the hybrid pattern of grain structure with a less porosity for the respective composite coatings. The crystalline nature and the surface roughness are examined using the XRD analyser and surface profilometer respectively. The wear resistance of the dual ceramic coatings is improved compared to the Al-Si surface under all dry sliding conditions. The wear rate and Coefficient of Friction (CoF) of the FZA coating are lower around 1.2 times compared to ZAC coating due its improved surface hardness and the solid lubricant tribo effect. The worn surface of FZA coating evidences a solid ceramic lubricative layer, which acts as a preventive tribo layer. Further, the Taguchi methodology is adopted to optimize the wear rate and the CoF with respect to the tribo factors, which predicts the minimal wear rate and CoF of 0.75 × 10− 4 gm− 1 and 0.352 respectively for FZA coatings with 94.9 % of desirability.
The present requirement of the aerospace industry is seeking light-weight joining material that satisfies the technical and technological requirements with better mechanical characteristics. Aluminum alloy with spot-welding process meet the requirements of modern demands. In this present paper, a modified-interlock friction stir weld lap joint is induced to join AA8011-AA7475 with different wt% of SiC particles. Friction stir machine process parameters were tool rotational speed 1600 rpm, plunge speed rate 0.08 mm/s and traverse speed 40 mm/s maintained constantly. Mechanical and metallurgical characterizations were investigated. EDS analysis and microstructure confirmed the presence of silica particles in the NZ of the weld joints and uniformed homogenous distribution of the particulates throughout the weld. Joints made with SiC particulates showed improved static properties because intensive softening occurred in the stir zone leading to Si-Al-based precipitate particulates. The fracture test showed that the joints with SiC had a ductile fracture. AA8011-AA7475 with 2 wt% SiC showed maximum hardness, tensile strength of 229 HV, 192 MPa and a decrease in elongation was observed from 9.5 to 5%. AA8011-AA7475/2 wt% showed improved hardness, tensile strength and elongation suitable for aircraft wing stringers application.
The purpose of this research was to fabricate and test a novel opuntia fibre and biosilica toughened epoxy resin hybrid composite. The main aim is to determine the effect of newly prepared fibre and particle additions on the mechanical, thermal, and other load bearing properties of brittle resin matrix. The opuntia short fibres and biosilica particles were silane treated using the aqueous solution method with 3-Aminopropyltrimethoxysilane. The composites were prepared by hand layup and then tested in accordance with ASTM standards. The mechanical properties of a composite containing 0.5 vol% biosilica and 30% opuntia natural fibre demonstrated an increase in tensile, flexural, and impact toughness. Similarly, the PS4 composite outperformed with the highest wear resistance. PS4’s dynamic mechanical analysis revealed a significant increase in energy storage. The highest storage modulus of 4.34GPa was observed, along with a loss factor of 0.71. The fatigue resistance of a composite composed of opuntia fibre and biosilica particles increased. With 34,371, the PS3 composite designation outperformed in fatigue life counts. Thus, the addition of silane-treated fibre and particle improves the load bearing and time-dependent properties significantly. Thus, novel opuntia fibre and biosilica particle in silane-treated form could be used as biodegradable reinforcement. These cost-effective epoxy biocomposite materials made of opuntia fibre and bagasse biosilica could be used in automotive, structural, defence, and other domestic applications that require a high load bearing capacity and biodegradability.
It is carried out a qualitative analysis of experimental indentation diagrams of topocomposites with coatings of titanium nitride and aluminum nitride, having substrates of aluminum alloy D16T. The reasons for obtaining the unloading curves of the indentation diagrams of the topocomposites under study – with a linear and nonlinear section of the end of the unloading curve characterizing the interfacial delamination along the coating-substrate interface are investigated. It is shown that the delamination mechanism in both topocomposites implements a linear dependence between the load and the depth of indentation. The high level of hysteresis losses of the aluminum nitride coating was established and explained. It is found that the nonlinear shape of the end of the unloading curves of the indentation diagrams of topocomposites with coatings of aluminum nitride is associated with solid-phase structural changes in the coating material. The connection between the diverse aspects of the material world, considered in this work on the example of a change in the structure of matter under the influence of mechanical forces, can serve as an example of the development of models for knowledge management.
High performance epoxy biocomposite coating material was prepared using agricultural waste (rice husk) derived biosilica and characterized for visco-elastic, thermal conductivity and hydrophobic behavior. The main aim of this research was to prepare a high performance biocomposite coating material for air-duct application in aircraft. The biosilica ultra fine particle was prepared via thermo-chemical method and surface-treated using amino silane. The visco-elastic results revealed that the addition of silane-treated biosilica of 4 vol.% produced highest storage modulus of 7.2 GPa, loss factor of 0.51 and glass transition temperature of 91οC. The highest thermal conductivity of 0.3w/mK was observed for 4 vol.% of as-received biosilica in epoxy while the silane-treated biosilica of 4 vol.% gives 0.18w/mK. Similarly, the contact angle results revealed that the silane-treated biosilica of 4 vol.% retains higher contact angle of 85ο. This high performance epoxy biocomposite coating material could be used as a coating material for aircraft passenger air-duct to improve the condition of air and reduce the heat loss during flow during flow. Moreover the coating on air-ducts improves the life of welded joints, rivets and overall product.
Electroplastic Effect (EPE) is the influence of electrical current on the microstructure and the plastic flow of materials. In this work, duplex stainless steel UNS S32750 has undergone uniaxial tensile tests with the aid of pulsed electrical current. Different current densities and thermal tests were conducted to separate the EPE from the heating effect. The tested material shows an increase in fracture strain and uniform elongation, while ultimate tensile strength and yield strength were barely affected.
Performance of two kinds of energy storage methods used in the household refrigeration is investigated and analyzed. A Mixture of De-ionized water with Natural graphite (3 wt%) and Paraffin (OM–46) were considered for phase change material (PCM) in the evaporator side and the condenser side respectively. After thorough investigation through experimental verification it is inferred that this set up has significantly enhanced the condenser heat transfer and the overall performance of the refrigerator. The variation in the compressor exit temperature exhibits a considerable dip in the maximum temperature of the compressor. This helps to increase the life time of the compressor. The evaporator and condenser temperature were approximately the same when the PCM is used on evaporator side. Under test conditions, this design of refrigerator could save energy by 16–22 % with PCM on condenser and 7–13 % with PCM on evaporator.
The present study investigates aluminium alloy powder (Al7075) of mesh size 60 μm and the reinforcement SiC of varying its weight percentage (2 wt%, 4 wt%, 6 wt%) and keeping constant Al2O3 (2 wt%) of particle size <50 nm has been used to synthesis aluminium alloy hybrid nanocomposites. The compaction pressure (350 MPa) and the sintering temperature (750 °C) are used to develop such hybrid composites. The microstructure and mechanical behaviour of progressed composites have been characterized as per ASTM standards. The aluminium alloy hybrid composites sintered effectively and the strengthening particles are consistently disseminated in the matrix alloy without indication of the cluster along with the fine grains of intra dendrite grain boundaries that are precipitated throughout grains of an aluminum matrix. In comparison with base alloy, the hardness (14%) and compressive strength (24%) of synthesized composites have been increased invariably. ASTM B117 salt spray experiment has been performed to study the corrosion properties of incorporated composites. It has been inferred that corrosion-resistant is improved due to the presence of interface AlC2, Al2SiC between the intermixtures. This act as a barrier for disruption and it minimizes the effect of oxidation of developed aluminium hybrid composites.
This mathematical model forms machine cells, optimises the costs of unassigned machines and components, and designs the shop floor cell layout to have minimal movement of materials. The complete similarity measure algorithm forms machine cells and part families in a refined form. Later, exceptional elements are eliminated in the optimisation model by using machine duplication and sub-contracting of parts. Then the shop floor layout is designed to have optimised material movements between and within cells. An evaluation of the cell formation algorithm’ performance is done on the benchmark problems of various batch sizes to reveal the process’s capability compared with other similar methods. The data of machining times are acquired and tabulated in a part incidence matrix, which is used as input for the algorithm. The results from the linear programming optimisation model are that costs are saved, machines are duplicated, parts are sub-contracted, and there are inter- and intra- cellular movements. Finally, the output of the inbound facility design is the floor layout, which has machine cell clusters within the optimised floor area.
The rapid increase in technological development and the population of the world is ac-companied by increased energy consumptions, leading to higher and higher electricity and heat generation demand. This present research investigates the performance of a cold storage system integrated with low-cost surface functionalized biochar nanoparticle-based phase change material (PCMs) for space cooling and some experimental investigations to enhance the thermal performance for a refrigeration provided with subcooled cold storage unit. The biochar nanoparticle of size < 100 nm were surface functionalized using 3-Aminopropyl)triethoxysilane (APTMS) via aqueous solution method. The subcooled cold storage unit was equipped with an energy storage tank provide with phase change materials (PCM), heat exchanger, and heat pipes. During off-peak period, when the cooling load requirement was lesser than the rated cooling capacity of the system, the excess cold energy and the atmospheric temperature gradient extracted by heat pipes during night were stored in the energy storage tank of subcooled unit with the help of PCM. The energy stored in the PCM of energy storage tank was utilized during peak hours and hence the cooling effect and coefficient of performance (COP) of the system are increased. A decrease in evaporator temperature by 0.1 °C resulted in increase of overall thermal performance of the system by 10% and also minimizes the electrical load by 9% for the period of 337 h. It is observed that the cold storage room with PCM consumes less energy and it has energy saving potential of 9% compared to system without thermal storage unit and it is having an annual energy saving of 691.1 kWh. These performance improved cold storage units could be used in agriculture, fisheries, horticulture, and medical to store the food grains, fruits, vegetables, fish products, and medicines when they need to be preserved at deep freeze for a long span usage.
The study considers inverse kinematics (position problem) and velocity analysis of a six-degree-of-freedom hexapod-type manipulator with a circular guide. The structure of the proposed manipulator provides location of all drives fixed on the base and excludes the collision of the adjacent carriages when they move along the circular guide. The inverse kinematics provides the explicit relations between the platform coordinates and the driven (controlled) ones. The velocity analysis follows next and presents a procedure to find the driven velocities based on the platform ones. Example implemented in MATLAB demonstrates the performance of the proposed algorithms. As a case study, the platform motion along a screw trajectory is considered.
The paper presents basic approaches to assessment of strength, service life, and survivability of structural components of technical systems subjected to various types of operating loading regimes. These include: (i) thermo-mechanical loading regimes of normal operation inducing the states of stress and strain that can be considered using traditional stress-based methods and criteria; (ii) extreme design basis loading regimes related to design basis emergency situations that require a transition to design according to strain-based fracture criteria with accounting for temperature, force and frequency factors, and (iii) loading regimes induced by beyond design basis (accident and catastrophic) situations that should be analyzed using equations and criteria of nonlinear deformation mechanics in its most complex thermally coupled formulation.
Wheeled tractors and wheeled earth-moving machines are widely used in road construction, in municipal services. The group of wheeled vehicles, numerous and varied in purpose and design, are general transport vehicles used for the transportation of various types of bulk cargo, and specialized vehicles designed to perform narrow target functions. A characteristic feature of these types of wheeled vehicles is their ability to work not only on roads with asphalt-concrete pavement, but also on deformable soil surfaces. When the wheels roll on the ground, the power consumption required to ensure the movement of the wheeled vehicle increases sharply, questions arise related to the passability of the vehicles, their controllability, and the loads in the transmission. In this regard, it becomes necessary to consider various aspects of the movement of machines in these conditions, in particular, the determination of the power spent on rutting and the depth of the track, which is what this study is devoted to. The use of the “stamp wheel” model in this work made it possible to obtain relatively simple dependencies that make it possible to calculate the depth of the track and the power spent on rolling both a single wheel on deformable soil, and during sequential passage of wheels with a widening of the track, when the next wheel does not move “in trail", i.e. exactly along the track laid by the first wheel, and with some lateral displacement. In this case, part of the wheel moves along the laid track, and the other part expands the track, compacting the previously non-deformable soil. The results of calculations using the derived formulas are in good agreement with experimental data, which indicates the practical applicability of the obtained dependences.
Wheeled vehicles belong to the most common type of transport and technological machines and are used in almost all sectors of the national economy: in urban and intrafactory transport, in construction, in the army, in agriculture, etc. Due to the fact that wheeled vehicles must correspond to the solution of the tasks that this or that industry poses for them, their structure and types are very diverse. Among them are wheeled vehicles designed to work not only on roads with asphalt-concrete pavement, but also on deformable soil surfaces. These include, in particular, machines used in road construction, in municipal services - wheeled tractors, wheeled earth-moving machines, general transport vehicles used for the transportation of various types of bulk cargo, and specialized, designed to perform narrow target functions. The performance indicators of wheeled vehicles are largely determined by the interaction of their wheels with the supporting surface, which has led to a large number of studies in this area. The rolling of a wheel on a hard surface has been studied in sufficient detail and is presented in a large number of works. At the same time, issues related to wheel rolling on deformable soil have not been sufficiently worked out, there are many uncertainties and inaccuracies. This applies, in particular, to the case of a wheel rolling on the ground with a pull, when the plane of rotation of the wheel is deflected by a certain angle from the vector of the wheel axis velocity, which leads to the appearance of an additional lateral force acting on the tire sidewall and the corresponding moment of resistance to turning. When a wheel with a pneumatic high-pressure tire rolls, the wheel rolls on the ground, almost without changing its cylindrical shape, i.e. practically without deformation. This greatly simplifies the calculations associated with the analysis of the operation of wheeled vehicles. In this article, when considering the rolling of a wheel with withdrawal on deformable soil, the dependences were used to determine the longitudinal and transverse tangential stresses in contact, obtained for the case of wheel rolling on a solid base; the lateral force acting on the tire sidewall and the corresponding moment of resistance to turning are determined.
The paper presents the results of design and experimental studies of strength and service life of NPP components subjected to multi-frequency cyclic loading regimes. Experimental studies were carried out on laboratory specimens of low-alloy austenitic reactor steels for a wide range of variation of frequencies and amplitudes of cyclic stresses, as well as on models during bench life tests and on the equipment of the reactor primary circuit during commissioning and during the initial period of operation. In the general case, a comprehensive design and experimental analysis of the initial and residual life of the equipment of nuclear power plants are based on an analytical assessment of the conditions for the accumulation of operational damage under various operating loading conditions, with accounting for the corresponding constitutive laws and the kinetics of the mechanical properties of materials, as well as on the study of conditions for transition to limit states using criteria of strength, crack resistance and damage tolerance. The approaches to assessment of the reduction of fatigue durability due to combined action of low- and high-frequency harmonics of loading are described. A model for estimation of fatigue damage of structural components under two-frequency loading is presented which considers damage accumulation as a summation of damages due to static loading plus damages due to low- and high-frequency loading. The obtained results present the basis for the estimation of the durability of NPP components at two-frequency loading.
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25 members
V. V. Biryukov
  • Department of Industrial Biotechnology
Sergey Kalenkov
  • Department of Physics
É. I. Grigolyuk
  • Department of Physics
B. V. Berdyshev
  • Department of chemical engineering
Valeriy Monastyrskiy
  • Department "Machines and technologies of casting production"
Bolshaya Semenovskaya str., 38, 107023, Moscow, Russia
Head of institution
Andrey V. Nikolaenko
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