Global Energy

RAR RUS 7-15 Bocharov Yurij Zhuk Vladislav beetlevladislav@gmail.com Pylneva Alla allapylneva@mail.ru COMPACT COMPOSITE INSULATION TOWERS FOR HIGH VOLTAGE OVERHEAD TRANSMISSION LINES Effective applicability of composite materials in towers for high voltage overhead transmission lines is a question of present interest. According to the conventional opinion, primary benefits of composite towers are specified by lightweight and compact size of composite modules. Significantly, that electrical insulating properties of composite towers can be used for more efficiency of constructions. This article focuses upon findings of lightning protection and insulation for 220 kV overhead transmission line with the lightening conductor and electric insulating towers. It is shown that by using insulating properties of composite towers it is possible to decrease dimensions of 220 kV line and increase its operational reliability. 621.315.668.9 COMPOSITE TOWERS; ELECTRic INSULATION TOWERS; COMPACTIZATION OF OVERHEAD TRANSMISSION LINES; ELECTRic INSULATION; LIGHTNING PROTECTION. https://engtech.spbstu.ru/article/2014.90.1/ 1_bocharov.pdf

RAR RUS 16-25 7102545375 Peter the Great St. Petersburg Polytechnic University, Russia Kirillov Alexander ai_kirillov@mail.ru, tot@pef.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Galaev Sergei sealga@mail.ru Isupov Vasilii vasiliy.isupov@gmail.com Smirnov Evgeny application OF EDDY RESOLVING METHODS FOR THREE-DIMENSIONAL FLOW IN A GAS TURBINE EXHAUST DIFFUSERUSING The article is aimed at showing motivation to setting computations of three-dimensional unsteady turbulent flow in an annual powerful gas-turbine exhaust diffuser with power struts. Two variants of eddy resolving methods among those implemented in the ANSYS FLUENT package are considered. Results of auxiliary test computations of separated flow around an airfoil performed with the URANS and the IDDES methods are presented. It has been conducted numerical simulation of turbulent flow in the exhaust diffuser under real conditions of its work. Comparing to the test data, it is evaluated capabilities of the URANS and the IDDES methods with respect to accuracy of diffuser efficiency prediction. It is shown evident superiority of the IDDES method. 621.165–253.5:620.193.1 GAS TURBINE; EXHAUST DIFFUSER; NUMERICAL SIMULATION; EDDY RESOLVING METHODS. https://engtech.spbstu.ru/article/2014.90.2/ 2_kirillov.pdf

RAR RUS 26-39 https://publons.com/a/ 56426211200 https://orcid.org/ Petrichenko Mikhail fonpetrich@mail.ru Kharkov Nikita nkharkov@mail.ru Nemova Darya darya.nemova@gmail.com Hydraulic version of the Boussinesq model of free convective motion in vertical slits The article concerns the hydraulic version of Boussinesque free convective motion model adapted to the flow in the vertical plane slit. The author determines the limiting values of friction and heat transfer medium speed, pressure thrust, speed adjustments. It is proved that the average speed of a free-convective motion is proportional to the height of the gap and drop of temperature. Under the limited air velocity, heat exchange rate is maximal. Under the limited heat exchange, air velocity is minimal. The deformation of the flow velocity along the length of the slot provides a minimal pressure change: the movement is organized in such a way that the deviation from the equilibrium state is minimal. 501:530.1:532 free-convective motion; boundary problem for a differential equation; Crocco differential equation; extremal properties. https://engtech.spbstu.ru/article/2014.90.3/ 3_petrichenko.pdf

RAR RUS 40-48 Zabelin Nikolay n.zabelin.turbo@mail.ru Kotlov Dmitrii dmitrii_kotlov@mail.ru Rassokhin Victor 55752274100 Gazprom Transgaz Saint-Petersburg, Russia Fokin Georgy gfokin@spb.ltg.gazprom.ru.

Bronevaya Ulitsa, 4, Sankt-Peterburg, Russia, 198188

Small flow rate turbine in installations for independent power supply of gas distribution stations The article is dedicated to one of the most actual present issues – providing energy saving and energy efficiency technologies over gas distribution stations. It is argued that electric energy generation needed for acceptable operation of gas distribution stations, can be implemented through supply of internal energy of compressed natural gas passing through expander-generator turbine before supplying to the end consumer. For these purposes the article proposes using the expander-generator based on small flowrate turbine design LPI with a large relative pitch of the blades, which was developed in Saint Petersburg State Polytechnical University (SPbPU). 621.165–155 EXPANDER-GENERATOR; SMALL FLOWRATE TURBINE DESIGN OF LPI; CENTRIPETAL TURBINES; GAS DISTRIBUTION STATIONS; POWER SUPPLY. https://engtech.spbstu.ru/article/2014.90.4/ 4_zabelin.pdf

RAR RUS 49-60 Andreev Roman ndreevroman89@mail.ru wind turbine for the small stand-alone electrical complex The article offers the algorithm for equipment selection of small stand-alone electrical complex on the base of wind turbine. The algorithm is tested on an example of a small group of consumers in the decentralized power supply zone. Using databases of weather observations and real technical parameters of electrical equipment from manufacturers, all characteristics of stand-alone electrical complex are proved. The selection is based on the results of economic efficiency evaluation of the complex usage. 621.311.24 stand-alone electrical complex; wind turbine; equipment selection; economic efficiency evaluation. https://engtech.spbstu.ru/article/2014.90.5/ 5_andreev.pdf

RAR RUS 61-70 Trinchenko Aleksei trinchenko@mail.ru adoption of low-temperature swirl combustion technology in power boilers as a way for improving their environmental specifications The article deals with the results of developing the mathematical model of solid fuel combustion in the power boiler by adopting the method of low-temperature swirl combustion, generation and conversion in the combustion process of nitrogen and sulfur oxides. The quantitative evaluation procedure is developed. It is carried out the comparison of calculation results with experimental data obtained after the reconstruction of the new technology BKZ-220-9,8 of Novomoskovskaya TPP. 504.06:621.181 POWER BOILER; FURNACE; SOLID FUEL; COMBUSTION PROCESS; MATHEMATICAL MODEL; NITROGEN OXIDES; SULFUR OXIDES; REDUCTION OF HARMFUL EMISSIONS. https://engtech.spbstu.ru/article/2014.90.6/ 6_trinchenko.pdf

RAR RUS 71-80 Naeimi Abbas naeimi.mech@gmail.com Rassokhin Victor Numerical simulation and feasibility study of thermal desalination plants Iran has a considerable amount of gas turbine plants and many of them have been located in the south, near the seashore region. Because of fresh water shortage in some parts of Iran, these power plants are used for supplying fresh water. The most common desalination methods are RO (Reverse Osmosis), MSF (Multi-Stage Flash distillation), MED (Multi-Effect Distillation), and MED–TVC (Multi-Effect Distillation-Thermal Vapor Compression). In this research, methods of RO, MED, and MED–TVC are compared. Simulation results show that heat recovery of emissions of the main stack is an optimal case for providing demineralized water (DM) required for injected steam of MED desalination. This subject is very important because of improving thermal efficiency of power plant using extra heat recovery. It has been shown too that by adding three rows of finned tube to de-aerator evaporator, which is very simple and low cost, required steam for generating 5200 m3/day of desalinated water is obtainable. 628.165 Turbine; Desalination; Thermodynamic simulation; MED; Water. https://engtech.spbstu.ru/article/2014.90.7/ 7_naimi.pdf

RAR RUS 81-91 Minaev Oleg minaev.op@bk.ru THE EFFECTIVE METHOD TO PROTECT BUILDINGS AND CONSTRUCTIONS FROM DYNAMIC VIBRATION EFFECTS BY COMPACTION OF NEARBY BOTTOM SOILS The dynamic vibration impact on water-saturated bottom soils causes harmful effects on nearby buildings and structures, which limit the conditions of using in-depth methods of ground compaction. By author’s assumption the possibility of their extension may be obtained by isolating array subject entitled to compaction, with a screen made of aerated soil. The article contains the theoretical study’s results of the method of dynamic vibration protection of buildings and structures on the estimated models, data of laboratory experimental research and experience of its approbation in vibration protection practice. Experimental approbation was first made to protect residential building from the intense vibration. After having aerated bottom soils, vibrations of the building stopped. 624.138.22:624.131.216 WATER-SATURATED GROUNDS; SANDY SOILS; DYNAMIC VIBRATION IN-DEPTH METHODS OF COMPACTION; AERATION OF THE LAYER OF THE BOTTOM SOIL; AMPLITUDE AND SPEED-UPS OF VIBRATIONS OF THE BOTTOM SOIL; REDUCTION OF SEISMIC ACTIVITY; SAFE DISTANCE OF BUILDINGS AND CONST https://engtech.spbstu.ru/article/2014.90.8/ 8_minaev.pdf

RAR RUS 92-99 56825574900 Peter the Great St. Petersburg Polytechnic University, Russia Gumeniuk Vasiliy kaf-uzchs@mail.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Grenchuk Andrey grenchuk@yandex.ru diagnosis and ANALYSIS OF LARGE CONTACT INTERMEDIATE RESISTANCES for providing fire safety of ELECTRICAL CONTACT CONNECTIONS The article focuses on analysis of application features of means for thermal monitoring for diagnostics of electric contacts overheating. Analysis results are systematized for identifying signs of such a fire-prone process as occurrence of large contact intermediate resistances. It is proved the possibility of application of overheating indicators based on thermo-bimetallic sensitive elements. Thermo-bimetallic indicators are used for the detection of defective electrical contacts during holding preventive measures dedicated to electric service. 621.3 FIRE SAFETY; DIAGNOSTICS; ELECTRIC CONTACT CONNECTIONS; INTERMEDIATE RESISTANSE; THERMO-BIMETALLIC INDICATOR. https://engtech.spbstu.ru/article/2014.90.9/ 9_gumenyuk.pdf

RAR RUS 100-103 B-7916-2013 6601971248 0000-0002-1173-8727 Peter the Great St. Petersburg Polytechnic University, Russia Korovkin Nikolay nikolay.korovkin@gmail.com

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Netreba Kirill knete-87@mail.ru THE EFFECT OF ACTIVE-REACTIVE CHARACTERISTICS OF GROUNDING SYSTEM ON OVERVOLTAGE LEVELS UNDER LIGHTNING STROKE TO POWER TRANSMISSION LINE SUPPORT The article considers the methods of determination of grounding system RLC equivalent circuit under lightning effects. It is carried out the evaluation of influence of grounding system model on overvoltage at the substation after lightning stroke to the neighboring power transmission line support. 621.316.99 GROUNDING SYSTEM; EQUIVALENT CIRCUIT OF GS; TRANSIENT RESISTANCE; RLC MODELS. https://engtech.spbstu.ru/article/2014.90.10/ 10_korovkin.pdf

RAR RUS 104-116 Rudskoj Andrey rector@spbstu.ru Sokolov Yuriy s5577@inbox.ru Kopaev Vladimir vkopaev_ela@mail.ru cooling’s process Modeling of particles of atomized metal in gas mixture of helium and argon In the present article it is considered the question of thermo-aerodynamic mathematical model construction of granules obtaining process by method PREP. It is conducted cooling process modeling of the particle in gas mixture of helium and argon with the account of the thermal and hydrodynamic phenomena. Time dependences of resistance force and heat-transfer factor during the particle motion are received. We have calculated the influence of cooling gases mix (90% of helium and 10% of argon on weight) on the process of VT6 titanic alloy particle cooling, taking into account phase transition of the particle from a liquid state to the firm one. It is shown that when modeling process of receiving granules of refractory metals it is necessary to allocate a crystallization stage separately. 621.762 mathematical modeling; granules; method PREP; aerodynamics; heat-mass transfer; gas environment. https://engtech.spbstu.ru/article/2014.90.11/ 11_rudskoy.pdf

RAR RUS 117-126 A-9655-2014 7007045735 0000-0001-7385-147X Peter the Great St. Petersburg Polytechnic University, Russia Kondrat'ev Sergey petroprom2013@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Khaydorov Aleksandr haidorow@yandex.ru CARBURIZING STEEL founding PRODUCED BY CAVITYLESS CASTING The article deals with the problem of carburizing steel founding, produced by cavityless casting. It is considered the possibility of decarburization of steel casting by the subsequent heat treatment on various modes. It is shown the efficiency of such heat treatment for decarburization of steels produced by cavityless casting. It is established that thermocyclic processing has the greatest impact on the structure of castings. 669.14:53.084.823:669.155:621.785.01:669.14.0 CAST STEELS; CAVITYLESS CASTING; CARBURIZING; DECARBURIZATION; HEAT TREATMENT; THERMOCYCLIC TREATMENT; MICROSTRUCTURE; MECHANICAL PROPERTIES. https://engtech.spbstu.ru/article/2014.90.12/ 12_kondratev.pdf

RAR RUS 127-137 Morachevski Andrey morachevski@mail.ru USED LEAD ACID BATTERIES — THE VITAL SOURCE FOR SECONDARY LEAD The paper discusses the issues connected with the production of secondary lead by recycling used lead acid batteries. It is shown that the collection of them is, above all, the principal concern on environmental protection. Recycling of lead acid batteries is not only economic, but also an environmental problem. 338/224:873.01–53 lead; recycling; processing; battery. https://engtech.spbstu.ru/article/2014.90.13/ 13_morachevskiy.pdf

RAR RUS 138-145 Kononov Aleksander a.a.kononov@russia.ru Glukhov Pavel Zotov Oleg zog-58@mail.ru Modeling of the temperature field on the section of the strip of grain oriented silicon steel during hot rolling By methods of mathematical modeling it was investigated the changes of distribution of temperature on thickness of a strip of anisotropic electric technical steel during hot rolling. On the basis of the data obtained it is determined the change of phase structure of the strip in the rolling process and it is evaluated its irregularity on thickness of the rolled strip. 621.771.23:669.1:669.017.3:621.787 ANISOTROPIC ELECTROTECHNICAL STEEL; HOT ROLLING; MATHEMATICAL MODELING; PHASE TRANSFORMATIONS; RECRYSTALLIZATION. https://engtech.spbstu.ru/article/2014.90.14/ 14_kononov.pdf

RAR RUS 146-155 Rudskoj Andrey rector@spbstu.ru Sokolov Yuriy s5577@inbox.ru on RESEARCHing the PARTICLE TENSION on impact with CAMERA WALL by using ANSYS WORKBENCH PROGRAM COMPLEX The article draws on the intense deformed condition of a particle and camera wall within their interaction in the course of receiving granules by the PREP method. The criterion is an admitted threshold of elastic plastic deformation providing the set quality of granules. It is shown that modeling of the intense deformed condition of the particle and camera wall within their interaction is the effective tool for the research of a process of receiving granules by PREP method. The approach suggested allows to predict quality of granules. The developed mathematical model has an applied value. The model allows to calculate the process modes when receiving granules from refractory metals and alloys, intermetallid, etc. It is executed the research of a process of collision of the titan-made particle with a steel wall by using the modern program ANSYS complex. 621.762 MATHEMATICAL MODELING; GRANULES; METHOD PREP; INTENSE-DEFORMED CONDITION; POWDER METALLURGY. https://engtech.spbstu.ru/article/2014.90.15/ 15_rudskoy.pdf

RAR RUS 156-165 Zotov Oleg zog-58@mail.ru Sulyagin Roman Roman_sulyagin@mail.ru Kononov Aleksander a.a.kononov@russia.ru Shamshurin Аlexey ON RESEARCHING THE REASONS OF A DECREASE OF DUCTILE CHARACTERISTICS OF PIPELINE STEEL SPECIMENS DURING CTOD TEST The paper considers the pipeline steel specimens with different values of CTOD. A number of metallographic structure researches by optical microscopy and scanning electron microscopy were carried out. Chemical compositions of matrix and nonmetallic inclusions were determined. It was established that the chemical composition, presence and distribution of nonmetallic inclusions in specimen center part are the main factors that determine the ductile characteristics. 669.14-462:669.017.3:620.171:621.771.23 PIPELINE STEEL MICROSTRUCTURE METALLOGRAPHIC researches MICROSECTIONs DUCTILE CHARACTERISTICS CTOD TEST NONMETALLIC INCLUSIONS MANGANESE SULFIDES SILICON OXIDES FRACTURE BEHAVIOR https://engtech.spbstu.ru/article/2014.90.16/ 16_zotov.pdf

RAR RUS 166-173 Zamotin Kirill Mishin Maxim maximvmishin@gmail.com, mmishin@spbstu.ru modeling of coating defects nanomaterial thin layers The paper draws on the results of modeling the process of dust particles size changing during their transportation from the synthesis area to the substrate. It is considered the process of particle size changing as a result of coagulation which occurs by their movement in the non-homogeneous electric field. It is given the problem statement and the solution method, which enable to calculate the formation of coating defects – large spherical particles of a micron size. The parametrical research of size distribution of agglomerates is conducted and it depends on the depth of the potential well, reagent consumption and carrier gas. 51-7:531:532:533 Mathematical modeling Nanoparticles dust particles coating defects https://engtech.spbstu.ru/article/2014.90.17/ 17_zamotin.pdf

RAR RUS 174-180 Lukianov Aleksei lookianov0@gmail.com Sokolov Yuriy s5577@inbox.ru MECHANICAL PROPERTIES OF THE COMPOSITE MATERIALS PRODUCED BY SIB TECHNOLOGY Mechanical properties of the titan composite alloys produced by the method of electron beam synthesis are investigated. It is studied the possibility of an increase of wear resistance of such alloys by drawing superficial coverings from molybdenum. Various technologies of drawing coverings are considered. It is discovered that the synthesis technology by an electronic beam provides homogeneous composite material. Layer-by-layer synthesis by an electronic beam enables to produce the demanded mechanical properties of materials. Comparison of composite materials with the compact ones of the same composition showed that they are highly competitive with mechanical properties. It is shown industrial application prospectivity of the technology considered, for obtaining materials of different function. 621.762 POWDER METALLURGY; COMPOSITE MATERIALS; ELECTRON BEAM SYNTHESIS; MECHANICAL PROPERTIES; STRUCTURAL MATERIALS. https://engtech.spbstu.ru/article/2014.90.18/ 18_lukyanov.pdf

RAR RUS 181-187 Osina Julia julia_npf@list.ru Borisova Margarita electrical and Dielectric properties of composite films based on polyethylene The article is dedicated to the study of zeolite fine filler impact on the dielectric characteristics of high-density polyethylene. The author has researched the dependency of the charging and discharging currents in the range of temperatures (90-110)°C and analyzed the data obtained on the base of the Voigt equivalent circuit. Within low frequencies (10-1 – 10-4) Hz in parameters of the Voigt equivalent circuit, the electric characteristics are calculated both for the initial low pressure polyethylene and for that with additional filler. It is executed the calculation of one of the main technical characteristics of the film polymeric materials – ka absorption coefficient. 621.315 (075.8) Low pressure polyethylene; nonpolar polymer; zeolite; charging and discharging currents; absorption coefficient. https://engtech.spbstu.ru/article/2014.90.19/ 19_osina.pdf

RAR RUS 188-195 Lapshin Kirill kirill.lapschin@gmail.com DESIGNing OF AXIAL COMPRESSOR by the KINEMATIC MODELING METHOD The quality of an axial compressor depends on the initial design stage-level one-dimensional gas-dynamic calculations. Therefore it means the aim of designers to use at this stage certain experience in successful compressors previously created. It is developed the new design method of running parts of multistage axial compressors – the kinematic modeling method. Its core is that for designing a new compressor it is used kinematics of good compressor prototype. We have obtained the basic formula that underlies the design of gas-dynamic calculation of the flow part of multi-stage axial compressor. The kinematic modeling method is implemented as a computer program. The results from this program showed that basing on the kinematics of the flow in the flow part of the compressor prototype one can design variants of compressors with different indicators and choose the best option. 621.43.031.3.001.2 Design of axial compressors; Design of gas-dynamic calculation; kinematic modeling Method; the Choice of the optimal variant. https://engtech.spbstu.ru/article/2014.90.20/ 20_lapshin.pdf

RAR RUS 196-202 Makarov Sergei ssmak15@mail.ru Chekmyshev Konstantin chekk.90@mail.ru Makarova Elena evmak7@yandex.ru MATHEMATICAL MODEL OF CYLINDRICAL BLANK COOLING BY ONE-DIMENSIONAL NON-STATIONARY WATER STREAM The paper represents the mathematical model of cooling a cylindrical solid metal blank made of construction steel by the non-stationary water stream. Parametric study of cooling process is carried out. The basis of mathematical model is a system of differential equations such as: equation of continuity, equation of momentum, equation of energy for water steam and heat equation for blank. The model neglects the possibility of vaporization. The water steam is single-phase medium. The equation of two-dimensional non-stationary task of thermal conductivity is solved by double-sweep method. Boundary conditions are those of the third kind. In terms of blank of 30HGSA steel we have determined: reduced heat-transfer coefficient during the time of cooling process, reduced velocity, reduced pressure and temperature of water stream throughout of cooled blank surface. The article shows the evaluation possibility of phase change in the metal according to cooling rate over the entire blank volume. The mathematical model of cooling process and results obtained can be applied for solving engineering and metallurgic problems. 536.24:519.63 mathematical model; cooling; cylindrical metal blank; heat transfer parameters; water stream; numerical calculation. https://engtech.spbstu.ru/article/2014.90.21/ 21_chekmyshev.pdf

RAR RUS 203-209 Blazhnov Aleksandr aablazhnov@gmail.com vortex VACUUM CONTACTLESS GRIPPER The paper describes the operating principle and 3D-model of the vortex vacuum gripper. Based on the results of numerical experiments we have obtained and analyzed the dependency of holding force on the geometric parameters of the vacuum chamber and the working gas flow. According to the results we have formed recommendations on the design of vortex сontactless vacuum grippers. 621.5 automatization; industrial robots; classification; vacuum gripper; mathematical model; pressure distribution; restraining forces; numerical experiments; design recommendations. https://engtech.spbstu.ru/article/2014.90.22/ 22_blazhnov.pdf

RAR RUS 210-222 Zabelin Nikolay n.zabelin.turbo@mail.ru Matveev Yuty 55752274100 Gazprom Transgaz Saint-Petersburg, Russia Fokin Georgy gfokin@spb.ltg.gazprom.ru.

Bronevaya Ulitsa, 4, Sankt-Peterburg, Russia, 198188

Bearings for small flowrate turbines of autonomous electrical power sources This article gives analysis of the different designs of gas-dynamic bearings used in turbo-expander generators. It is shown that the best and most reliable bearings are flap gas dynamic. Application prospectivity of flap bearings in turbomachines compared with other types of gas bearings is stipulated by their increased resistance to self-excited oscillations in a wide range of rotor speed, low sensitivity to moisture and contamination of gas medium mechanical impurities. Prospective viability is also proved by zero wear of friction surfaces at high rotor speed, operation ability at the sudden change in temperature, low sensitivity to deformation of the housing, rotor distortions and deviations from the alignment of the bearing assembly, low complexity of manufacturing and machining accuracy, reliability, the ability to start and stop the rotor without compressed gas supply, large lifespan operation. 621.165 Small flowrate turbines; compressor; reliability; gas bearings; hybrid bearings; axial bearings; petalled bearings. https://engtech.spbstu.ru/article/2014.90.23/ 23_zabelin.pdf

RAR RUS 223-232 Sklyarevskiy Aleksandr ansk46@mail.ru Egorshin Vladimir egorshinvp@mail.ru Application of the one-piston rod hydraulic cylinder in a hydraulic servo power drive with ensuring the symmetry of dynamic and static characteristics The article examines the structural chart of hydraulic cylinder which enables to get symmetry of speed and pull characteristics during reversible work. The study offers a development of nonlinear mathematical model of electro-hydraulic servo power drive, containing this hydraulic cylinder in the structure. Calculation researches of dynamic and static characteristics are conducted at the different signs of entrance signal. The estimation of influence of row of design factors of hydraulic power drive is executed for the similarity of transients in it and the symmetry of speed characteristics during reversible work. The study shows that at a certain correlation of the positive ceilings of pressure and return choke cracks of slide-valve of electro-hydraulic power-amplifier, the identity of dynamic and speed characteristics of hydraulic servo power drive is provided with acceptable preciseness. 62-82 Hydraulic cylinder; speed characteristics; dynamic; mathematical model; calculation; servo power drive. https://engtech.spbstu.ru/article/2014.90.24/ 24_sklyarevskiy.pdf

RAR RUS 233-239 Bazhukov Artiom artem_bashukov@mail.ru Rolle Vladimir v.rolle@rambler.ru the effect OF pretension force ON THE STATIC POSITION OF THE TRACKED VEHICLE HULL TThis article proposes the calculation methodology of the static position of the tracked vehicle hull. It is given the mathematical model of the track assembly. It is shown the dependency of the mass center position, relative to the ground, on the pretension force. It is conducted the reference calculation, the results of which are presented in plot form. Numerical experiment was carried out on an example of the tracked vehicle of light category with a rear drive wheel. 629.365 TRACK; STATIC POSITION; pretension force; TRACKED VEHICLE. https://engtech.spbstu.ru/article/2014.90.25/ 25_bazhukov.pdf

PER RUS 240-244 Morachevski Andrey morachevski@mail.ru academician Vitaly Grigorjevitch khlopin (to the 125 birthday) The essay describes life and work of academician Vitaly G. Khlopin (1890-1950), the outstanding Russian scientist in the field of radioactive substances. Being a prominent specialist in the field of radioactive substances, V.G. Khlopin was one of the closest colleagues of academician V.I. Vernadsky, he was the head of the radium Institute in Leningrad for many years, created a large scientific school of radiochemists, took an active part in the implementation of the Atomic project in the USSR. 001:929 Vitaly G. Khlopin; historical figures; scientist; radioactivity of the substance. https://engtech.spbstu.ru/article/2014.90.26/ 26_morachevskiy.pdf