Science & Technique最新文献

{"title":"About Application the Tyre-Road Adhesion Determination of a Vehicle Equipped with an Automated System of Brake Proportioning","authors":"D. Leontiev, I. Nikitchenko, L. Ryzhyh, S. I. Lomaka, O. Voronkov, I. V. Hritsuk, S. V. Pylshchyk, O. Kuripka","doi":"10.21122/2227-1031-2019-18-5-401-408","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-401-408","url":null,"abstract":"The paper considers a method for calculation and evaluation of an automated brake proportioning system and it also describes assessment of efficiency while using cohesion forces of an automated system during vehicle braking process (MAZ 256200 taken as an example). A method for efficiency estimation of the vehicle braking equipped with an automated brake proportioning system is graphically presented in the paper. A comparable analysis has been made in order to evaluate vehicle braking efficiency in three various conditions of its wheel motion during braking process. The paper contains description of braking processes for a vehicle at its idealized braking, at braking with an operating automated system and at braking with blocked wheels. Mathematical dependences have been proposed and they make it possible to calculate a coefficient of cohesion forces used by an automated brake proportioning system on the basis of time parameters for vehicle braking process. The proposed mathematical dependences take into account design peculiarities of the automated system, i.e. a diagram of modulator arrangement on axes of the vehicle. The executed analysis for calculation accuracy of the coefficient pertaining to use of cohesion forces of the automated system with and without taking into accout rolling force resistance of the vehicle wheels has demonstrated a possibility to apply the proposed calculation methods for carrying out auto-technical expertise while investigating road-traffic accidents involving transport facilities equipped with such systems as ABS. The paper proposes a dependence for identification of a vehicle braking distance on the basis of the coefficient on use of cohesion forces by the automated brake proportioning system. The executed experimental investigations on both test and serial models of the automated brake proportioning system have allowed to justify theoretical discussions concerning application of tyre-road adhesion in the operational process of the vehicle brake proportioning system. The investigation results have shown high efficiency of the test automated brake proportioning system developed by Chair of Automobiles in the name of A. B. Hredescul at Kharkiv National Automobile and Road University under the following braking conditions: dry road surface and compacted snow cover.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88851728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving Properties of Tool Steels by Method of Dynamic Alloying","authors":"A. S. Kalinichenko, V. Ovchinnikov, S. Usherenko, Javad Yazdani-Cherati","doi":"10.21122/2227-1031-2019-18-5-369-379","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-369-379","url":null,"abstract":"The influence of high-speed particle fluxes on changes in the structure and properties of materials has been widely studied currently. The effect exerted by particles moving at very high speeds can have both negative (in spacecrafts) and positive character (dynamic processing of tool steels). Therefore a task for studying an effect of high-speed particle flows on structure change in tool steels and improving their performance properties has been set in the paper. The study has used an explosive method for creation of a high-speed flow of SiC + Ni and Al2O3 particles. Samples after dynamic alloying have been subjected to diffusion nitriding. Microstructure of specimens made of X12M, R18, R6M5K5steel has been studied using optical and electron metallography. Wear resistance of the samples has been also tested on a friction machine. Theoretical and experimental results on a complex effect of high-speed microparticle flows and nitriding on a structure and properties of tool steels have been obtained during the research. It has been established that dynamic alloying by particles leads to formation of a specific structure in a composite material reinforced with channels. Central fiber (channel) zone with powder particles residues is surrounded by areas of amorphous state which is succeeded by a zone with a nanocrystalline fragmented cellular structure. Then we observe a zone with a microcrystalline structure that transits to a zone with crystalline structure which is characteristic for a matrix material of structural steel. The obtained data can expand and complement some ideas about mechanisms for dynamic loading of solids and condensed matter, plastic deformation, physical mechanics of structurally inhomogeneous media at different levels, a number of effects arising from collision and ultra-deep penetration of microparticles into metals. It has been shown that wear resistance of high-speed steel subjected to dynamic alloying in the quenched state is increased by 1.2 times in comparison with wear resistance of steel alloyed in the annealing state.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90667637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Loading Frequency on Fatigue of Construction Materials","authors":"V. V. Mylnikov","doi":"10.21122/2227-1031-2019-18-5-427-435","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-427-435","url":null,"abstract":"Investigations have been carried out in respect of structural steel and titanium alloy fatigue at various cyclic loading frequencies and these investigations have made it possible to reveal regularities in changes of parameters pertaining to fatigue resistance and stability behaviour of the tested materials. A change in cyclic loading frequency affects duration of a single (during one cycle) stay of the material in the loaded state and it has an impact on its durability. In addition, with an increase in frequency of load cycles, deformation rate becomes higher, and stress build-up time is decreasing, while distortion of a crystal lattice is increasing due to reduction of time for development of a weakening process. This process is accompanied by an increase in intensity of grain crushing into fragments and blocks, and their disorientation. Tests on cyclic strength of the studied material samples have been carried out at various frequencies and at a room temperature according to the following loading schemes: cantilever cyclic transverse bending of a flat sample; cantilever bending with rotation of a cylindrical sample; axial tension on a pulsating cycle. Quantitative estimates of a fatigue resistance index in the form of slope tangent in a left branch of the fatigue curve to a cycle axis have been used in order to analyze and evaluate performance and stability of the tested materials. Methods for mathematical statistics have been applied to process the obtained results. Graphic dependences of fatigue curves have been plotted in logarithmic coordinates that allowed to obtain straightening of approximating lines for experimental data. The investigations have revealed that loading frequency has an ambiguous effect on fatigue resistance due to some differences in materials in respect of their reaction to changes in a load spectrum within different areas of the fatigue process, but at the same time it has been found that an increase in fatigue strength leads to a slope decrease in the fatigue curve regardless of a decrease or an increase in a load frequency. The paper proposes a new approach to assess a cyclic strength and durability of materials, and it comprises a system of parameters including a relative coefficient of limited endurance, a correlation coefficient and a slope tangent of the fatigue curve. Behavior dynamics for real machine parts and structures made of these alloys under operating conditions has been indicated in the paper.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89512012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Diesel Fuel Ignition Portion Value on Working Process Parameters of Gas-Diesel Engine","authors":"G. A. Vershina, O. S. Bystrenkov","doi":"10.21122/2227-1031-2019-18-5-395-400","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-395-400","url":null,"abstract":"More and more requirements are imposed to engines of internal combustion due to the passage of time. These requirements are caused by the necessity to save fuel, to reduce emissions of pollutants into the atmosphere, to improve operational reliability, to reduce size and cost of spent materials, weight, noise level, to simplify manufacturing and operational processes. Use of gas as a fuel in the cities where number of engines is extremely large can significantly reduce environmental pollution. Some countries have separate environmental programs that encourage transfer of engines from gasoline to gas. At present, however, the use of gas engines in road transport is limited due to a number of technical and operational problems. Mathematical calculations and simulations are applied in order to solve this task and prevent possible problems in a manufactured. As part of the research to establish an influence of the diesel fuel ignition portion value in a gas-diesel engine on parameters of its operational process, it is necessary to develop an appropriate calculation method. In this regard, an analysis of methods and programs for calculation of the operational engine process has been carried out, and a method for calculation of an operational process for a gas-diesel engine has been developed in the paper. A computational study has been made in accordance with the developed methodology. The paper has revealed an influence of the diesel fuel ignition portion value on effective and environmental performance of an engine operation. The calculation has been performed for a nominal mode of the engine operation, gas fuel – propane-butane. Design parameters of a ГД-243-engine have been taken as initial data for the calculation. The following dependences have been established: as a diesel fuel ignition portion is increasing (replacement proportion of gas fuel with diesel), there is some decrease in engine power, and under the accepted conditions, there is an increase in CO2 with a decrease in CO and NO.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80443504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Materials for Gas-Thermal Spraying, Obtained by Diffusion Alloying from Powders Based on Austenitic Steels","authors":"F. Panteleenko, V. Okovity, A. F. Panteleenko","doi":"10.21122/2227-1031-2019-18-5-380-385","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-380-385","url":null,"abstract":"The article presents experimental studies of composite powder materials for plasma spraying, obtained by the method of diffusion doping of powder materials based on austenitic steels. It is indicated that the main factors forming the diffusion layer on a powder material are a composition of the required saturating medium, treatment temperature and duration of chemical and thermal exposure. Creation of single-phase diffusion layers is possible only in the case of a minimum level of temperature-time characteristics during heat treatment. This is also facilitated by the use of media with a low concentration of boron and introduction of additives inhibiting saturation process (such as carbon, aluminum, silicon) into a saturating mixture of powder. Structure and composition of powders have been thoroughly investigated with the help of X-ray microanalysis that has made it possible to study location of elements contributing to powder alloying and micro-durametric characteristics. A component of high-boride phase is increasing due to higher degree of powder material alloying. Significant changes in phase composition, as well as the chemical one, are noticeable in diffusion processing of the following alloyed powder materials: РR-Х18N9, РR-Х18N10, РR-Х18N15. Free carbon being displaced by boride into a transition zone creates dispersed complex carbide compounds with chromium. This is confirmed by distribution nature of carbide-forming components in a powder particle. All carbide-forming elements have characteristic concentration peaks-bursts in contrast to non-carbideforming silicon. Silicon is practically not present in the considered FeB phase and it is found only in a very small amount in the studied Fe2B phase; it is pushed aside by high-boride phases to a sublayer. The change in microhardness of the FeB and Fe2B phases under study is associated with dissolution of corresponding alloying elements in them and distortions of a crystal lattice in borides. A similar phenomenon is also characteristic for saturation while using boron or while making chemical and thermal treatment of alloyed steels, it has been noted in a number of studies. The increase in microhardness of a particle nucleus during its boriding is caused by displacement of carbon and alloying elements by growing front of boride phases. A core zone moves with an increased microhardness to a particle core while increasing temperature mode and time of boronization and up to realization of the effect with counter diffusion.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74756643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Wastewater Treatment Process on Energy Costs at Truck and Tractor Washing Posts","authors":"A. V. Krutau, M. Dechko, M. A. Boika","doi":"10.21122/2227-1031-2019-18-5-436-442","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-436-442","url":null,"abstract":"The paper considers a process pertaining to purification of oily effluents while using electrocoagulation, electro-flotation and an electromagnetic hydro-cyclone, implemented with the help of a laboratory unit (Patent of the Republic of Belarus for the invention No 21229). The investigations have been carried out with the purpose to optimize specific energy consumption for the process of cleaning fuel and lubricants effluents. The following investigation methods have been applied – a literature review, a comparative analysis, an experiment execution, a mathematical modeling. Content of oil products in wastewater before and after treatment has been evaluated in the analytical laboratory of the Belarusian State Agrarian Technical University in accordance with standard methods. Purification of the oily effluents has been made with the help of a laboratory unit while using electroflotocoagulation method with removal of floated sludge in an electromagnetic hydrocyclone. This cleaning method makes it possible to increase a degree of water disinfection, provides a closed water supply, rational use of water resources, reduction of harmful effects of pollutants on the environment. An experimental design technique has been worked out and a three-level Box – Behnken design has been implemented in the paper. The problem concerning optimization of the purification process on energy costs has been solved without worsening the required concentration indices of petroleum products in water after treatment . Mathematical models have been obtained and optimal purification modes have been determined at the lowest specific energy costs and with sufficiently high degree of purification. Significance of regression coefficients has been estimated by Student criterion. It has been established that while using the proposed unit it is possible to obtain a degree of wastewater purification at automotive equipment washing stations with its performance G = 0.7 l/s, current density j = 150 A/m2. The degree of purification, determined by ratio of pollutant concentrations before and after purification, is up to 99.9 %. The results can be used in implementation of microprocessor control of cleaning mode while taking an initial concentration of pollution, unit capability, current density of an electroflotocoagulator as control action factors.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88598911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure and Tribological Properties of Chromium Coatings Formed by Electrodeformation Cladding with Flexible Tools","authors":"В. К. Шелег, М. А. Леванцевич, Е. В. Пилипчук, С. М. Назаров","doi":"10.21122/2227-1031-2019-18-5-359-368","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-359-368","url":null,"abstract":"The paper contains results of investigations on structure and tribotechnical properties of chromium coatings formed by a method of electrodeformation cladding with flexible tools (EDCFT). The purpose of these investigations is to assess prospects for application of the coatings as an alternative to galvanic chrome plating which is widely used in manufacturing hydraulic cylinder rods of metal-cutting machines. Rotary metal brushes with a wire pile made of 65Г-steel and 03Х17Н14М2-stainless steel have been used as a flexible tool. A compacted bar obtained by sintering a mixture of pure chromium powders and a nano-sized diamond-graphite blend UDDG has been employed as a donor material for EDCFT. According to results of the research it has been established that alloying elements of wire pile such as chromium and nickel are added to a coating composition while forming coatings a stainless steel brush. So in the case of using brushes with wire pile of 03X17H14M2-stainless steel the amount of chromium and nickel in a clad coating layer is 5.3 and 9.6 times higher in percentage, respectively, in comparison with the coating formed by a 65Г-steel brush that can contribute to improvement of coating corrosion resistance. At the same time, surface relief of the coating has a developed rough structure consisting of chromium microparticles having various size that are tightly packed and elongated in the direction of brush rotation and there are no flaws in the form of discontinuities and delaminations. Tribological tests have been performed under conditions of “boundary lubrication” on a rotary friction machine that implements friction of a rubber indenter on a flat surface of a rotating disk. According to data of the tribotechnical tests it has been ascertained that under conditions of “boundary friction” for such paired samples as “coated disc – rubber roller” chromium coatings formed by the EDCFT method, have the lowest values of a sliding friction coefficient (fтр = 0.023) which are 7.5 times lower than chromium coatings obtained by electroplating. At the same time the wear of rubber rollers in pairs with electroplated chromium coatings has turned out to be less than in pairs with the coating formed by the EDCFT method.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78123538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Investigations on Determination of Polymer Packing Material Composition with Biocide Additives","authors":"Г. Козлов, доц. О. В. Балабанова, V. V. Kuzmich, N. Kozlov, I. I. Karp, O. Balabanova","doi":"10.21122/2227-1031-2019-18-5-409-415","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-409-415","url":null,"abstract":"The paper shows that creation of materials with antibacterial and antifungal action presupposes an introduction of additives in them. One of the directions concerning fight against mold fungi is an inclusion of biocide additives having vegetable origin in structure of polymer materials used for manufacturing packing products. The main mission of anti-microbial additives is reduction of microbe amount in product mass and on its surface. Activity of anti-microbial compounds depends on the following parameters: concentration of active component, pH, temperature, polymer type, introduction method (with plasticizer or in melting state) and time period of their contact with polymer. In addition it is necessary to take into account such not unimportant factor as sensitivity of micro-organisms. Modern film polymer materials ensure only a certain level of product protection. They can not targetedly affect biochemical and microbiological changes in a packing product. It is necessary to develop new packing materials with selective permeability that create a barrier on the way of extremely intensive gas and moisture exchange, outside microflora flow, and prevent an evolution of undesired micro-organisms on packing products. Polymers have been selected as a basis for a bactericide packing material. Investigations have shown that composition including PEHP 98% (polyethylene of high pressure) + DGR (disproportionate gum rosin) + DETA (diethylenetriamine) has inhibited (hindered) sufficiently in a good way growth of mold fungi and PEHP composition with additives of tallow pitch and polyethylenepolyamine has demonstrated a rapid deterioration of strength characteristics and an increase in additive of the supposed mixture including pine oleoresin (POR) with DETA and DGR (with DETA more than 2%) hinders rapidly strength material characteristics.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82554113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Address for correspondence: Lugovaja Inna S. – Belarusian National Technical University, 12 Ya. Kolasa str., 220013, Minsk, Republic of Belarus. Tel: +375 17 292-84-37 gpa_atf@bntu.by","authors":"I. S. Lugovaja","doi":"10.21122/2227-1031-2019-18-5-422-426","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-422-426","url":null,"abstract":"Hydraulic systems used in mechanisms and machines are intended for mechanical movements: load lifting, material pressing, moving of working bodies, etc. Mineral oils with low viscosity are used in them as working fluids. Such liquids include food products (honey, molasses, tar, minced meat, dough, pasta, creams, starches), construction materials (clay, cement, sealant), petroleum products, etc. which are found in chemical and textile, wine and bakery, cosmetic and confectionery, dairy and paintwork, construction industry and many other areas of activity. At the same time, hydraulic systems are used in various sectors of the national economy, which are designed for pumping or transporting a high-viscosity working fluid. However, description of such hydraulic systems, their classification, specific features of the devices of which they consist, has yet received insufficient attention. In this regard, this paper provides a classification of hydraulic systems for pumping and transporting highly viscous liquids, a description of their composition, main types of pumps and devices for controlling and performing technological tasks widely used in various industries. It is shown that all pumps used for these purposes can be divided into two groups: dynamic and volumetric. The paper presents schemes of devices, a brief description and operational principle of pumps used for these purposes. The executed analysis has shown that an operation of hydraulic systems for pumping highly viscous liquids necessitates further study of their characteristics, as well as development of methods for calculation and design.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79585713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigations on Stresses in Optical Components with Spherical Surfaces","authors":"A. S. Kozeruk, Y. L. Malpica, M. Filonova, V. О. Kuznechik","doi":"10.21122/2227-1031-2019-18-5-416-421","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-5-416-421","url":null,"abstract":"The paper has substantiated an expediency to fix lenses with a thin center (biconcave, flat concave and negative meniscus) to a non-operational cylindrical surface. This avoids their temperature distortion at the blocking stage which is a reason for occurrence of irremovable micro and macro errors on executive surfaces of a component after its unblocking and it causes astigmatism in an image which is formed by an optical-electronic device. The paper considers a method for attachment of a lens to its side surface and it contains a design description of the device for mechanical attachment of the studied lenses during their simultaneous double-sided abrasive processing under free-grinding conditions. The paper presents a methodology for determination of a stressed state in lenses, which is based on a mathematical model of a uniform elastic isotropic deformation of a solid body. This approach takes into account a finite element method which consists in an approximation of a body under study with the help of a model presenting a set of elements with a finite number of freedom degrees which are interrelated at node points. The investigations have been executed with the purpose to study a nature of deformation distribution in a lens which made it possible to establish a directly proportional dependence of displacements in the center of the part on the magnitude of clamping forces. The paper reveals an insignificant influence of a clamping force magnitude and elastic characteristics of a lens on an optimum position of an application plane of its clamping forces. A non-contact method for monitoring errors on a polished lens surface using an interferometer with a reference front surface has been proposed in the paper.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2019-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77051454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}