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Сообщения, помеченные ‘№1 (15) 2013’

19
Jan

Lomova O.S., Sorokina I.A. The study of stress-strain state of cylindrical grinding machines by finite element technique

The study of stress-strain state of cylindrical grinding machines by finite element technique

Lomova O.S., Sorokina I.A.

Nowadays, the development of mechanical engineering is featured by the continuous accuracy improvement of machine parts as well as perfecting the geometric shape of blanks. Shape deviation of cylindrical surfaces significantly affects the contact rigidity, wearing qualities, impermeability, noise and other performances of the equipment. The consideration of accuracy problem aims at providing accurate manufacture of machined parts, as well as analyzing the reasons for errors in treatment, which depend on the technological effectiveness factors. Radial cutting force makes the greatest affect in comparison with other factors. One way to improve the accuracy of treatment is to reduce forced vibrations and deformation of machine tool units. The paper presents the research of elastic deformation impact of cylindrical grinding machines on the treated surface accuracy. A 3D model of the blank machine-treatment has been designed. The strains and stresses of the technological system under cutting force have been calculated by finite element technique.

Keywords: the method of finite elements, the elastic deformation, the cutting force, grinding accuracy.

References

  1. Novoselov Y.K. The dynamics of surfaces formation by abrasive machining. – Saratov: Saratov State University, 1979. – 232 p.
  2. Aljamovskiy A.A. Engineering calculations in SolidWorks Simulation. – Moscow: DMK Press, 2010. – 464 p.
  3. Lomova O.S., Lomov S.M., Morgunov A.P. Precision machining for cylindrical grinding machines: Monograph. – Moscow: Publishing Center «Mechanical Engineering», 2011. – 176 p.

«Engineering industry and life safety» №1 (15), 2013. Pages: 72-76

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Lomova Olga Stanislavovna – Ph.D., Omsk State Technical University, Omsk, Russia. E-mail: 190567@mail.ru

Sorokina Irina Aleksandrovna – Graduate student, Omsk State Technical University, Omsk, Russia. E-mail: Irina3980@mail.ru

19
Jan

Lodigina N.D. Calculations of contact stresses of mating screw surfaces

Calculations of contact stresses of mating screw surfaces

Lodigina N.D.

Due to stress concentration in the contact area, there is a great deal of strain, which results in the local plastic deformation and destruction. Contact stresses take up some 80% of the total amount of stresses in strength estimation of screw mating surfaces. It is difficult to determine nominal contact stresses, so the calculations are performed by the elasticity theory methods. The contact stresses have been calculated by Hertz formulas in the longitudinal screw cross-section of a screw mechanism. The need to calculate contact stresses in the longitudinal screw cross-section is caused by total stresses of the screw, coil and contact stresses (a complex calculation technique of the stress state screw surfaces). Energy deformation analysis (the fourth theory of strength) is used as the contact strength criterion; its applicability has been proved by the experimental data. It is advisable to apply this contact stress calculation technique to all types of point-contact gearing as well as friction gearing.

Keywords: contact stresses, the contact strength, spiral surface, tangential stresses, the strength criterion of modification energy.

References

  1. Gostev E.G. A short course of materials strength. – Moskow: Nauka, 1977. – 456 p.
  2. Lodigina N.D. Investigation of the stress components screw mechanisms // Engineering industry and life safety, 2011, № 1. – P. 63-66.
  3. Lodigina N.D. Stressed state at the arbitrary point of the section of the turns of components of misaligned screw mechanisms // Engineering industry and life safety, 2011, № 2. – P. 55-57.
  4. Calculations of strength in engineering / S.D. Ponomarev, V.L. Biderman, K.K. Likhachev, etc. – Moskow: Mashgiz, Vol.1, 1956. – 884 p., Vol.2, 1958. – 974 p., Vol.3, 1959. – 1118 p.
  5. Rechetov D.N., Goller D.E., Bragin V.V. Prospects for standardization calculations gears // Bulletin of Engineering Industry. 1985, № 11. – P. 3-7.
  6. Sharapov R.V., Lodigina N.D. Stress analysis of parts misalignment screw mechanism // Fundamental research, 2009, №5. – P. 70-71.

«Engineering industry and life safety» №1 (15), 2013. Pages: 67-71

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Lodigina Nina Dmitrievna – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: nina.lodygina@yandex.ru

19
Jan

Zelinskiy V.V. Failure factor evaluation of linkages for railway tamping machines

Failure factor evaluation of linkages for railway tamping machines

Zelinskiy V.V.

The paper deals with the relationship between fatigue damages of railway tamping machine linkages and provisions for their loading while performing regular operations. The damages may be accounted for low cycle fatigue caused by multiple short-term overloads. Mathematical modeling lets us obtain calculation formulas to estimate the effect of specific technological factors on forces resisting the machine movement. Machine components creating the largest resistance forces and loads in the linkage have been detected. The paper gives comparative load evaluation under the main technological factors such as the lift height of the railway when tamping and constant of friction in the roller grips contact with the rail. Technological and design recommendations have been given to reduce loads in the linkages and probable development of fatigue damages.

Keywords: damage, fatigue, part, resistance, load, factor, constant of friction, roller grip.

References

  1. Orlov P.I.  Design Basics: Reference Manual. In 2 books. Book 1 / Ed. P.N. Usachov.  3rd ed. – Moskow: Mashinostroenie, 1988. –  560 p.
  2. Sorensen S.V., Kogaev V.P., Shneyderovich R.M. Bearing capacity and settlement of machine parts for durability. Guide and reference manual. 3rd ed.  – Moskow: Mashinostroenie, 1975.

«Engineering industry and life safety» №1 (15), 2013. Pages: 63-66

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Zelinskiy Viktor Vasiljevich – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: selvik46@yandex.ru

19
Jan

Zharkov N.V., Pavlov G.A. The improving of cutting cantilever-fixed parts on CNC lathes

The improving of cutting cantilever-fixed parts on CNC lathes

Zharkov N.V., Pavlov G.A.

The paper presents the method of improving movement accuracy of the tool and the blank when turning cantilever-fixed parts. One of the reasons limiting accuracy improvement in cantilever-fixed parts turning is an untimely sending correction signals to the control actuator. In a real drive it is impossible to check the time of sending correction signals, since registration, processing and transmission of the signal via feedback channels takes a certain amount of time. As a result of the feedback signal falling, there is a tool correction delay in the turning process. It results in the additional error component. When using a computer model of the cutting process in the guidance loop, it is possible to create and send a feedback signal to the control channel without any delay. This lets the actuator adjust the tool movement in advance.

Keywords: blank, tool, model, modeling, cutting, accuracy, efficiency.

References

  1. Weitz V.L., Maksarov V.V. The dynamics of technological systems of machining: Monograph in 5 parts. Part 5. Self-oscillations in the machining process systems. – St. Petersburg: SZTU – SpbIMash, 2002 – 224 p.
  2. Kudinov V.A. Dynamics of machines. – Moskow: Mashinostroenie, 1967. – 260 p.

«Engineering industry and life safety» №1 (15), 2013. Pages: 57-62

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Zharkov Nikolay Vladimirovich – Ph.D., Vladimir State University, Vladimir, Russia. E-mail: zhar-kov_nikola@mail.ru

Pavlov Georgiy Andreevich – Master student, Vladimir State University, Vladimir, Russia. E-mail: rpo_tavr@mail.ru

19
Jan

Eliseev S.V., Eliseev A.V., Kashuba V.B. Features of gap estimation in model problem of flipping particle with unilateral constraints

Features of gap estimation in model problem of flipping particle with unilateral constraints

Eliseev S.V., Eliseev A.V., Kashuba V.B.

The article presents the research results of mechanical systems with unilateral constraints. The model problem of flipping a particle on a horizontal surface with unilateral constraints under gravitation is considered. The re-search deals with the time and height of the particle reaching the surface in accordance with the surface frequency and vibration amplitude. The estimation of the gap between the material particle and the vibration surface is obtained. The paper presents analytical ratios of frequency and the surface vibration amplitude that provide a predetermined height or the reaching time of the material particle. A number of maximum flipping characteristics are given. The paper discusses restrictions on the mathematical model parameters, based on the surface physical characteristics and the ways to modify the original mathematical model. The methodological framework can be used in the research of continuous flipping mode, taking into consideration some additional constant force.

Keywords: unilateral constraints, the interaction of a particle with the vibrating surface, one-touch flipping mode, multiple flipping mode, the gap between particle and surface, flipping height, flipping time, the particle take-off.

References

  1. Loytsyanskiy L.G. The course of theoretical mechanics: in 2 vol. Vol. 2. Dynamics / Loytsyanskiy L.G., Lurie A.I. – Moscow: Nauka, 1968. – 638 p.
  2. Lurie A.I. Analytical Mechanics. – Moscow: Nauka, 1986. – 516 p.
  3. Artobolevskiy I.I. Theory of mechanisms and machines. – Moscow: Nauka, 1978. – 640 p.
  4. Blechman I.I., Dzhanalidze G.Y. Vibratory movement. – Moscow: Nauka, 1968. – 316 p.
  5. Selvinskiy V.V. The dynamics of the contact interaction of solids. – Blagoveshchensk: Publishing House of the Amur State University. 2009. – 164 p.
  6. Eliseev S.V., Markov K.K. Some aspects of the dynamics of the oscillatory process with unilateral constraints // Mechanics and Control. – Irkutsk: IPI, 1971. – P. 71-83.
  7. Eliseev S.V.,  Lotkin O.I.  The conditions of existence and loss of contact for systems with unilateral constraints // Proceedings of the OMIITa. Vol. 69. – Omsk OMIIT, 1966. – P. 93-99.
  8. Gorbikov S.P., Neumark Y.I. The main modes of motion in vibro-tossing // Math. Academy of Sciences of the USSR, Mechanics of Solids, № 4, 1981. – P. 39-50.
  9. Eliseev S.V., Eliseev A.V. Modes flip of a particle on a vibrating surface in the model problem with unilateral constraints // Modern technology. System analysis. Modeling. 2012, № 3 (35). – P. 64-75.
  10.  Serebrenitskiy P.P. General Technical Reference. – St. Petersburg: Polytechnic. 2004. – 445 p.

«Engineering industry and life safety» №1 (15), 2013. Pages: 50-56

Download full text:Eliseev S.V., Eliseev A.V., Kashuba V.B. Features of gap estimation in model problem of flipping particle with unilateral constraints

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Eliseev Sergey Viktorovich – Professor, Irkutsk State University of Railway Transport, Irkutsk, Russia. E-mail: eliseev_s@inbox.ru

Eliseev Andrey Vladimirovich – Graduate student, Irkutsk State University of Railway Engineering, Irkutsk, Russia. E-mail: andrey.marketer@gmail.com

Kashuba Vladimir Bogdanovich – Ph.D., Bratsk State University, Bratsk, Russia. E-mail: plemja@rambler.ru

19
Jan

Blurtsyan D.R., Blurtsyan R.S., Blurtsyan I.R. The study of shape error formation regularity in the plunge centerless grinding of driveshaft cross-piece journals based on the thermal state of the machine and temporary stops

The study of shape error formation regularity in the plunge centerless grinding of driveshaft cross-piece journals based on the thermal state of the machine and temporary stops

Blurtsyan D.R., Blurtsyan R.S., Blurtsyan I.R.

The paper presents the research results of shape error formation regularity in the plunge centerless grinding of driveshaft cross-piece journals according to the thermal state of the machine and its temporary stops. The results provide decrease in the shape error of driveshaft cross-piece journal surfaces. The paper presents the dependences of shape error change (ellipticity, faceting) on the machine thermal state and its temporary stops. Various conditions of the machine thermal state (the state of long-term heating, the state of long-term cooling, the state of overnight stops) have been studied. The measurement of shape error parameters have been performed by means of the circularity meter. A number of circulargramms have been recorded under certain recording increase and their further processing. The results of the research are presented as guidelines for the use of technology in driveshaft cross-pieces production. It has been experimentally proved that the machine thermal state effects the shape error formation in driveshaft cross-pieces grinding. Being in the state of thermal balance, the machine provides greater shape precision in driveshaft cross-pieces centerless grinding.

Keywords: shape errors, centerless grinding, cross-pieces, the machine thermal state, stops in the machine operation.

References

  1. Blurtsyan R.S., Blurtsyan D.R., Blurtsyan I.R. The study of regularities of formation form errors, surface roughness and waviness in the mortise centerless grinding pins frogs drive shafts, depending on the speed of the leading circles // Engineering industry and life safety, 2012, № 1 (11). – P. 47-50.
  2. Blurtsyan R.S., Blurtsyan D.R., Blurtsyan I.R. The study of regularities of formation form errors, surface roughness and waviness in the mortise centerless grinding pins frogs drive shafts, depending on the momentary cross feed // Engineering industry and life safety, 2012, № 1 (11). – P. 51-54.
  3. Blurtsyan R.S., Blurtsyan D.R., Zalazinskiy M.N., Selihov G.F., Blurtsyan I.R. Study fatigue torsion shafts treated without grinding operations // Engineering industry and life safety, 2008, № 5. – P. 128-130.
  4. Blurtsyan D.R., Blurtsyan R.S., Blurtsyan I.R. Possibility of increasing the service life of the torsion shaft engineering methods // Engineering industry and life safety, 2009, № 6. – P. 85-90.
  5. Blurtsyan D.R., Blurtsyan R.S., Blurtsyan I.R. Investigation of the effect on the quality of the cutting surfaces with mortise centerless grinding // Engineering industry and life safety, 2010, № 7. – P. 89-94.
  6. Blurtsyan D.R., Blurtsyan R.S., Blurtsyan I.R. Technological features of the formation of residual stresses in the surface layers of the torsion shafts running // Engineering industry and life safety, 2011, № 1. – P. 17-20.

«Engineering industry and life safety» №1 (15), 2013. Pages: 45-49

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Blurtsyan David Rafaelovich – Professor, Sandvik Coromant, Sweden. E-mail: davidrafmontre-al@gmail.com

Blurtsyan Rafic Shavarfovich – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: raf-blur@yandex.ru

Blurtsyan Iosif Rafaelovich – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: iosifraf@list.ru

19
Jan

Biktashev D.A., Lieberman Y.L., Gorbunova L.N. Huffman-Lieberman synthesis code for CNC systems by DNC class machine tools

Huffman-Lieberman synthesis code for CNC systems by DNC class machine tools

Biktashev D.A., Lieberman Y.L., Gorbunova L.N.

DNC class CNC systems are the most rational and promising type of equipment and control systems, in particular, machine tools for flexible automated production. The two types of codes are used in the DNC systems such as Chudakov’s corrective ISO-7bit codes and the optimal (statistical) codes, based on Huffman’s synthesis algorithm. It is extremely difficult to detect errors in the programs made in Huffman’s code, if there are any. This entails a significant complication of CNC system interfaces and requires special software of their work. The paper presents an optimal Huffman-Lieberman uneven code for the transmission of control programs from the computer to the CNC machine tools designed for flexible automated production. The paper describes one of the possible synthesis algorithms of such codes and compares Huffman-Lieberman code with ISO-7bit Chudakov’s and Huffman’s algorithm. Huffman-Lieberman code will improve accident-free DNC class CNC systems, as well as reduce possible production failures and economic losses.

Keywords: Huffman-Lieberman code, CNC system, parity control, flexible automated production.

References

  1. Ratmirov V.A. Machine Control of flexible manufacturing systems. – Moskow: Mashinostroenie, 1987.
  2. Chudacov A.D. Management system flexible machining complexes. – Moskow: Mashinostroenie, 1987.
  3. Huffman D. Method of building codes with minimum redundancy // Cybernetic collection, № 3, 1961.
  4. Lieberman Y.L. Statistical codes for systems of numerical control machines directly from the computer // Machines and Tools, 1975, № 7.
  5. Lieberman Y.L. Principles and prospects of development of monitoring systems for machine tools. – Moscow: VNIITEMR, 1989.
  6. Lieberman Y.L., Zhurov S.P. Increased reliability of CNC machine tools DNC-class method of statistical encoding / Quality performance and reliability of the BMS. – Sverdlovsk, Ural Branch of the USSR Academy of Sciences, 1988.
  7. Lieberman Y.L., Timashev  S.A., Zhurov S.P. Statistical coding of information management programs as a way to enhance the reliability of the DNC class CNC. – Sverdlovsk, Ural Branch of the USSR Academy of Sciences, 1988.
  8. Lieberman Y.L. Monitoring systems for machine tools. – Ekaterinburg: Ural. gov. techn. university Press, 2000.
  9. Tsymbal V.P. Information Theory and Coding. – Kiev, Visha School, 1973.
  10. Novick D.A. Efficient coding. – Leningrad: Energiya, 1965.

«Engineering industry and life safety» №1 (15), 2013. Pages: 35-44

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Biktashev Denis Andreevich – Engineer, Ural Federal University, Ekaterinburg, Russia. E-mail: msi@mmf.ustu.ru

Lieberman Yakov Lvovich – Ph.D., Ural Federal University, Ekaterinburg, Russia. E-mail: yakov_liberman@list.ru

Gorbunova Lyubov Nikolaevna – Ph.D., Siberian Federal University, Krasnoyarsk, Russia. E-mail: Brigitta_81@mail.ru

19
Jan

Sharapov R.V. Indicators for monitoring and assessment of karst processes

Indicators for monitoring and assessment of karst processes

Sharapov R.V.

The paper presents a system of indicators used for monitoring and evaluation of karst processes. It details the quantitative indicators of the surface displays of karst processes, undersurface karst processes and underground hydrology displays. The indicators characterizing the undersurface forms of karst processes include the following: karst area infestation rate, karst form intensity rate, average frequency of karst formation, areal rate of karst area infestation , the average annual rate of karst area infestation, the volumetric rate of karst infestation, karst formation volume factor, an average annual expansion of karst area, the depth and the diameter of specific karst forms, indicator of the sinkholes depth, the rate of karst expansion size. The indicators characterizing the underground forms of karst processes are: the linear coefficient of internal karst formation, the linear coefficient of external karst formation, the linear coefficient of the total karst formation, the linear coefficient of surface karst formation, the abnormality coefficient, the linear density of karst cavities, the areal density of karst cavities, the volume density of karst cavities, karst processes activity rate, the total deposition of study area, the dissolution layer rate. The indicators characterizing the hydrological regime of the area involve the groundwater level, the rate of groundwater flow, the groundwater temperature, the chemical composition of groundwater, filtration rate of groundwater, fluctuations rate of karst springs flow rate, underground karst denudation, water saturation deficit of calcium sulfate, fluctuation rate of karst water mineralization, activity production of calcium and sulfate, calcium and carbonate, the leaching gradient.

Keywords: karst, karst processes, monitoring, karst surface forms, undersurface karst forms, groundwater.

References

  1. Bondarik G.K., Pendin V.V., Jarg L.A. Engineering Geodynamics – Moskow: KDU 2009. – 440 p.
  2. GOST R 22.1.06-99. «Safety in emergencies. Monitoring and forecasting of hazardous geological phenomena and processes. General requirements» – Moskow: 1999.
  3. Dubrovkin V.L. Karst study of new processes in seeking to track rail lines // Soviet Geology, 1948, № 35
  4. Kostarev V.P. The quantitative indicators of karst and their use in engineering-geological assessment of karst territories // Engineering and construction surveying, 1979, № 1.
  5. Makeev Z.A. The principles of engineering geological zoning of karst regions // Moscow Conference on Karst, vol. 4. – Molotov: Publication Molotov State University, 1948
  6. Maksimovic G.A. Karst basics. Volume 1. – Perm: Perm Book Publishing House, 1963.
  7. Guidelines on the organization and production of observation mode level, pressure and flow of groundwater. – M: VSEGINGEO, 1983.
  8.  Guidance on the production of observation mode, the temperature of groundwater. – M: VSEGINGEO, 1983.
  9. Problems of studying caverns mountain regions of the USSR. – Tashkent: Fan Uzbek SSR, 1983. – 150 p.
  10. Design, construction and operation of the roadbed in karst areas. – Moscow: Transport, 1968.
  11. Rodionov N.V. Engineering-geological studies in karst areas. – Moscow: Gosgeoltechizdat, 1958.
  12. Guidelines for geotechnical investigations in areas of karst. – Moscow: PNIIIS, 1995. – 167p.
  13. Sevarensky I.A. Engineering-geological assessment of karst phenomena in the area of Dzerzhinsk // Proceedings of the laboratory Giedre Geological Problems F.P. Savarensky, 1962, vol. 47.
  14. Tolmachev V.V. Engineering and building development of karst territories / V.V. Tolmachev, G.M. Troitsky, V.P. Homenko; Ed. E.A. Sorochana. – M. ​​Stroyizdat, 1986. – 176 p.
  15. Sharapov R.V. Monitoring exogenous processes // Engineering industry and life safety. 2012, № 2. – P.39-42.
  16. Sharapov R.V. Principles of groundwater monitoring // Engineering industry and life safety. 2012, № 3. – P.27-30.

«Engineering industry and life safety» №1 (15), 2013. Pages: 28-34

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Sharapov Ruslan Vladimirovich – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: info@vanta.ru

19
Jan

Dorofeev N.V., Orekhov A.A. The information processing structure of the subsystem for space-time geodynamic forecasting

The information processing structure of the subsystem for space-time geodynamic forecasting

Dorofeev N.V., Orekhov A.A.

The paper deals with the information processing structure of the subsystem for space-time geodynamic forecasting of geological environment. The structure under discussion aims at obtaining the predictive function of the geological environment caused by natural and man-made factors. Upon receiving the predictive function a number of factors should be taken into consideration: hydrological and thermal noise, the degree of karst-developed area, the reasons for karst process development, human impacts on soil as well as environmental factors affecting the soil deformation. The structure of the information processing subsystem prediction fits well with the modular and service-oriented architecture of the geographic information analysis system. The structure can be easily expanded by connecting new measurement systems and databases to a distributed system of global geo-environmental monitoring.

Keywords: geoelectric monitoring system, monitoring system, geo-ecology, geo-ecological monitoring, forecasting.

References

  1. Dorofeev N.V., Orekhov A.A. Organisation for Geographic Information Analysis System of geo-ecological monitoring // Radio Engineering and Telecommunication Systems, 2012, № 2. – P. 53-56.
  2. Orekhov A.A., Dorofeev N.V. Information-measuring system for geoelectrical monitoring of geodynamic objects // Radio Engineering and Telecommunication Systems, 2012, № 2. – P. 60-62.
  3. Tsaplev A.V., Kuzichkin O.R. The use of a regression process to compensate for temperature interference in the geoelectric monitoring // Radio industry, 2012, № 2. – P. 147-153.
  4. Orekhov A.A., Dorofeev N.V. Investigation of the influence of the groundwater regime in the geodynamic control objects // Algorithms, methods and data processing systems, 2012, № 21. – P. 46-52.
  5. Instanes А. Arctic Climate Impact Assessment // Scientific  Report, 2006, chapter 16.
  6. Orekhov A.A., Dorofeev N.V. Algorithm for correcting the influence of hydrological disturbance on the geodynamic control objects // Algorithms, methods, and data processing systems, 2012, № 22. – P. 74-78.
  7. Orekhov A.A., Dorofeev N.V. Geoelectric modeling underground water objects // Engineering industry and life safety, 2012, №4. – P. 16-19.
  8. Gittis V.G., Ermakov B.V. Fundamentals of spatial-temporal prediction in Geoinformatics // FIZMATLIT, 2004.

«Engineering industry and life safety» №1 (15), 2013. Pages: 24-27

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Dorofeev Nikolay Viktorovich – Ph.D., Murom Institute of Vladimir State University, Murom, Russia. E-mail: DorofeevNV@yandex.ru

Orekhov Aleksandr Aleksandrovich – Teacher, Murom Institute of Vladimir State University, Murom, Russia. E-mail: alexorems@yandex.ru

19
Jan

Fokin V.M., Kovylin A.V. Determination of thermophysical properties of construction and insulation materials in buildings for energy audits by means of nondestructive control

Determination of thermophysical properties of construction and insulation materials in buildings for energy audits by means of nondestructive control

Fokin V.M., Kovylin A.V.

Today energy saving has become an urgent issue connected with the rational usage and saving of global natural resources. Problems of energy saving and reduction of heat loss in the environment produce a significant effect on technical and economic performance, as well as on capital expenditures of operated buildings. Actual protection properties of buildings may change in the course of their operation and fail to meet the certification requirements. The same thermophysical protection properties (thermal conductivity coefficient – λ; thermal diffusivity coefficient – a; volumetric heat capacity – сρ; heat absorption coefficient – B) significantly affect heat and air regime when exploiting different-purpose buildings, as well as energy-consuming heating, ventilation and air conditioning systems. Therefore, one of the most important current issues is to find and create methods that are energy-saving, accurate, reliable and easy to implement. They will help determine thermophysical properties of external protection of operated buildings.

Keywords: energy saving method, external building protection, non-destructive testing, thermal properties, thermal conductivity coefficient, thermal diffusivity coefficient, volumetric heat capacity.

References

  1. The method of nondestructive testing of the complex thermal characteristics of solid building materials: Patent. 2421711 Russan Federation № 2009129316/28; appl. 29.07.2009, publ. 20.06.2011.
  2. Fokin V.M. Scientific and methodological basis for determining the thermal properties of materials by non-destructive testing: monography – Moskow: Machinostroenie, 2003. – 140 p.
  3. Ametistov E.V., Grigoriev, V.A., Emtsev B.T. Heat and Mass Transfer. Thermal Engineering Experiment: A Handbook. – Moskow: Energoizdat, 1982. – 512 p.
  4. Usadskiy D.G., Fokin V.M. Experimental determination of the thermal properties and parameters of the vapor-droplet heater in the steady-state thermal regime // Bulletin VolgGASU: Building and Architecture. – Volgograd: VolgGASU, 2011. Vol. 21 (40). – P. 118-123.

«Engineering industry and life safety» №1 (15), 2013. Pages: 20-23

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Fokin Vladimir Mikhailovich – Professor, Volgograd State University of Architecture and Civil Engineering, Volgograd, Russia. E-mail: Fokinvm@mail.ru

Kovylin Andrey Vasiljevich – Ph.D., Volgograd State University of Architecture and Civil Engineering, Volgograd, Russia. E-mail: Kovylin.andrei@mail.ru

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