V.N. Кushenko
The parameters and factor analysis of special loads on mine head frames from jamming of a rising vessel
Donbas National Academy of Civil Engineering and Architecture
Abstract. In article the technique and results of mathematical modeling of special loadings mine head frames is resulted at a jamming of a rising vessel in elastic-plastic and absolutely rigid basis. Key parameters of special loadings which the total effort and a difference of efforts of a tension of branches of an elevating rope and as inertial loadings from cross-section fluctuations of designs mine head frames are installed. As a result of numerical experiments three groups of factors of influence on parameters of special loadings are installed: conditions of an emergency; characteristics of the elevating machine; dynamic characteristics of mine head frames . On the basis of the executed factorial analysis conditions of occurrence of extreme values of special loadings are certain. For mine elevating machines depending on conditions of an emergency and characteristics of elevating machines emergencies of two kinds are probable: Without break of an elevating rope and with break of an elevating rope. For small elevating machines on which having dug an elevating rope it is not possible, to emergency special loadings there corresponds factor of dynamism on a horizontal component of the main vector of loading 1,5-1,53. For other elevating machines for which having dug an elevating rope it is possible, the corresponding factor of dynamism makes 1-1,1.
Keywords: mine head frames; special loadings; the factorial analysis; extreme values of loadings.
Z.N.Voytova, T.P.Maljytina, D.V.Levchenko
Designing of a protecting design of a segment outline on the basis of dot calculation
Donbas National Academy of Civil Engineering and Architecture
Abstract. In clause the questions formation of the form are considered at designing a protecting design of a covering of a segment outline located on str. Mira in Donetsk , on the basis of dot calculation. For the given object the mathematical opportunity of account of central points of farms for bilateral curve line of a covering is shown. The computing formulas were submitted as the mathematical device of dot calculation: as forming and directing curve line of a covering the parabolas second and maximum orders known as Б 2 for a curve plane were chosen. Having the equations of a parabola, with the help of computer algorithm formation’s form the arch of a curve was divided into necessary number of units, with the certain coordinates, which have set the required circuit of a farm at account of a design of a covering in a program complex “SCAD”.
Keywords: optimization of the task of the settlement circuit, dot calculation, curve Б2 of the order, mathematical opportunity of account of coordinates of central points, polycarbonaceous glassp lastics panel.
Ye.V.Shevchenko, T.Ye.Udod
Development of methods of fight against dance of the HL wires for Ukraine
Donbas National Academy of Civil Engineering and Architecture
Abstract. Violations of delivery of electric power, which arise up during low-frequency vibrations of wires, the task of fight is put against them on the first plan. The conducted theoretical researches of conduct of wire showed that most dangerous there are the cases of dance with 1, 2, 3 and 4 semiperiods of vibrations in flight. A plenty of different suggestions concerning the VL defence from dance of wires is presently known, it is known more than 130 patents. But the such generous amount of methods of defence testifies to that the radical method of fight against dance is not yet found presently. The put purpose is achieved to those, that in flight of air-track of electricity transmission on wires between contiguous wires it is set no less, than one insulating connector with hard resistance to tension and soft resistance to the compression with the limited flexibility in the direction of rapprochement of the united wires. The offered technical solutions, both method and device allow effectively to liquidate dance of wires, as a rule, still at the beginning of its origin.
Keywords: high-voltage lines of electricity transmission, dance of wires, theoretical researches, analysis of results, development of methods, device.
V.E.Volkova, M.I.Kazakevitch
Phase trajectory mappings in the analysis of chaotic system dynamic properties
Dnepropetrovsk National University of the Railway Transport
Abstract. The problems of the complex approach to the qualitative and parametric identification of considerably non-linear mechanical systems are given in this paper. The method described by the authors presents practical possibility of mechanical system identification with the usage of phase trajectory mappings on the plane “acceleration-displacement”. The suggested method is close to the method of time process treatment according to the peaks, but in contrast to the existing qualitative identification method is not so complicated in application.
Keywords: flexible rod, chaotic oscillations, phase trajectory mapping, phase plane “acceleration – displacement”, qualitative and parametric identification.
I.S.Kholopov, М.D.Мosesov, E.V.Il’dyyarov, S.M.Petrov
Investigation of a mode of deformation of roofing panel with the basalt fiber lagging
Samarskiy State Architectural and Building University
Abstract.
A method and results of experimental researches of the three-layered roofing panels is described with basalt fiber lagging. The mode of deformation of constructions was explored. Information is got about character of distributing of tensions in edging and work of basalt fiber lagging. Bearing strength of panels with different thickness is certain. Physical and mechanical properties are obtained. The calculation model of three-layered roofing panels are elaborated using the prinsiples of finite-element method.
Keywords: experimental researches, three-layered panels with basalt fiber lagging, bearing capacity.
S.V.Turbin
Estimation of the climatic loads on overhead lines principles perfection
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article is devoted to the questions of climatic loads estimation on overhead transmission line 330 kV root “Ladushinskaya TEC – Dnestrovskaya GRES” towers 1- 448” . This overhead line is under long term operation without considerable upgrading. The main purpose of the investigations is estimation of the “weakest” sections with the worst inside forces from the internal climatic influences. These principles were based on the main methodical provisions of Ukrainian power installation code (2006) and Code of technical state estimation of overhead transmission lines. The “weakest” sections of the line 330 kV “Ladushinskaya TEC – Dnestrovskaya GRES” towers 1- 448” which are required upgrading procedures most of all were estimated.
Keywords: overhead line, concrete and steel towers, climatic loads, topography features of the area, high- dependence, technical state estimation.