60 research outputs found
Use of Modern Materials in Technological Processes Accompanied by Frictional Heating
No full textThis reprint contains 14 articles published in the Special Issue, “Use of Modern Materials in Technological Processes Accompanied by Frictional Heating". These articles can be divided into five groups:1) Analytical modeling of the frictional heating process in systems made of homogeneous and functionally gradient materials (FGMs) [1–7];2) Numerical simulations of the temperature mode of railway brake systems [8, 9];3) Experimental studies and numerical simulations of the influence of various types of additives added to the friction material in the wet clutch disc [10, 11];4) Inverse thermal problems of friction [12];5) The influence of friction on the stress distribution in a composite containing thin elastic homogeneous inclusions, or that made of FGM [13, 14]
Initial Selection of Disc Brake Pads Material based on the Temperature Mode
No full textA spatial computational model of a motor vehicle disc brake, based on the system of equations of heat dynamics of friction and wear (HDFW), was developed. The interrelations of temperature-dependent coefficient of friction and coefficient of intensity of wear through the contact temperature and vehicle velocity were taken into account. The solution of the system of equations of HDFW was obtained by the finite element method (FEM) for six different brake pad materials associated with the cast-iron disc during a single braking. Changes in the braking time, coefficient of friction, braking torque, vehicle velocity, mean temperature of the contact area of the pads with the disc and wear of the friction surfaces were determined. Then, the obtained calculation results were evaluated in terms of stabilization of the coefficient of friction (braking torque), as well as minimization of the maximum temperature, wear, braking time and pads mass. As a result, recommendations were given to select optimum brake pad material in combination with a cast-iron disc
Frictional heating of the brake disc with essential nonlinearity thermal barrier coating
No full textInfluence of the Additive of Ceramic and Intermetallic Powders on the Friction Properties and Temperature of the Wet Clutch Disc
No full textThe basic function of friction clutches is to transfer the torque in the conditions of its smooth engagement without vibrations. Hard working conditions under high thermal and mechanical loads, leading to high temperature in the contact area, intense wear, and instability of the coefficient of friction impose restrictive criteria in the design of friction materials. In this paper, the results of experimental research of the effect of ceramic and intermetallic additives to the copper-based material of the friction disc of the clutch on the thermophysical and frictional properties were presented. Next, these properties were incorporated in the proposed contact 3D numerical model of the clutch to carry out computer simulations of the heating process and subsequent cooling. Based on the obtained experimental data and transient temperature changes of the friction and steel discs, the relations between the powder additives, thermophysical properties of the five friction materials, and coefficients of friction, wear, and temperature reached were discussed. Among these, it was found that when working with the lubrication, the largest values of the coefficient of friction 0.068 and wear [Formula: see text] were reached when using the 3 wt.% SiC additive
NATIONAL AND CULTURAL SPECIFICS OF SOVIET REALITY AND ITS LINGUISTIC REFLECTION IN E.A. EVTUSHENKO’S POETRY
No full textThe article analyzes E.A. Yevtushenko collections of “Utrennij narod”, “Zavtrashnij veter” and the poem “Zima”, which reflected the thorny social issues typical for the Soviet society of the 1970s.The urgency of this article is determined by the following factors: 1) close attention of the modern science to the issues of the conceptual analysis of text; 2) an increased interest in identifying the specifics of World Art Picture of the individual writers; 3) poor attention to the legacy of the poet E.A. Yevtushenko and the lack of the research of this particular theme in his work. The article aims in studying and describingtg the features of verbal and artistic expression of the concept of “citizenship” in the works of E.A. Yevtushenko, to study the structure and the implementation of the verbal concept “citizenship” on the material of artworks E.A. Yevtushenko.The material of this research are poems and prose by E.A. Yevtushenko of different creative periods. These poems and prose are objectifying the analyzed concept. In addition to the disclosure and clarification of the lexical content of the concept of “citizenship” in the system of the Russian language the following lexicographical material was used: “Explanatory Dictionary of Russian Language”V.I. Dahl; Dictionary of Russian language S.I. Ozhegova; Etymological dictionary of Russian Mikhail Vasmer, Dictionary of Russian ed. A.P Evgenyeva, Explanatory Dictionary of Russian ed. D.N. Ushakov and others.The main research method is a special linguistic technique conceptual analysis method that includes the steps of: 1) the vocabulary analysis of lexical paradigm of the word “citizenship”, 2) continuous sample of word lexical items appealing to the concept of “citizenship”, 3) contextual analysis to identify the content of the concept of “citizenship”. Also methods of theoretical research were used: the analysis, synthesis and deductive method (transition from general ideas about the concept “citizenship” to private terminals), a comparison, and also additional methods: descriptive component analysis method, the distribution method of analysis, the solid (from dictionaries) and partial sample material (of texts), word-forming analysis techniques, stylistic and frequency of the statistical characteristics of etymological analysis, a method of continuous sampling, analysis of dictionary definitions, conceptual analysis,comparative-typological analysis and statistical analysis. System-based and text-based approach were used.In conclusion author assumes that the words of the national cultural components play important text-forming role in the works of E.A. Yevtushenko. Identified sovietisms, vernacular elements, dialecticisms and words of the new way of life are the building the blocks of language of E.A. Yevtushenko, displaying a rich artistic world of the poet. Those elements express the way of life of the Soviet people
- …
