scholarly journals COMPARATIVE POWER CALCULATION OF THE LONGITUDINAL BEAM OF THE HEAD CAR BARROW IN THE SUBWAY ACTION IN THE MIDDLE OF THE BEAM OF UNIFORMALLY DISTRIBUTED LOAD

2021 ◽  
Vol 1 (161) ◽  
pp. 169-175
Author(s):  
O. Kuznetzov ◽  
O. Chuprinin ◽  
T. Suprun ◽  
D. Babaev
Keyword(s):  
Plastic Hinge ◽  
External Loading ◽  
Power Calculation ◽  
Electric Transport ◽  
Resource Saving ◽  
Bearing Strength ◽  
Loading Case ◽  
Deformed State ◽  
Simultaneous Loss ◽  
Underground Passage

Priority directions and events among basic industries of municipal electric transport is resource saving in a transport system of underground passage during his exploitation. First of all this problem must be decided by scientific accompaniment, id est on the stage of planning of details and knots of transport vehicles. One of the basic tasks decided on the stage of planning is an increase of bearing strength of details due to the analysis of their tensely-deformed state. The article is sanctified to the calculation of supply of carrying capacity of stringer of front carriage of subway at operating under the middle of the equipartition loading case-insensitive transversal forces. Priority of research theme is reasonable, an aim and tasks are set forth. Two going offer near the power calculation of bearing strength of stringer: calculation on the assumed tensions and on the maximum states. The resilient models of beams are examined in both cases. In case of calculation on the maximum state mechanics of origin of plastic hinges is first of all grounded in the places of the hard fixing of ends of beam. A beam saves the bearing strength still. At the further height of the external loading appearance of plastic hinge is justified even in the middle of beam with a simultaneous loss by the beam of bearing strength. For the design of behavior of beam in accordance with her descriptions, including on tensions and by the condition of loss of her bearing strength. The mathematical raising of task of calculation of bearing strength of stringer at the calculation of possible tensions and maximum state is examined case-insensitive transversal force. Bearing strength of stringer is analysed at a calculation on possible tensions and on the maximum state. The analysis of the got results allows to judge about efficiency of an offer mathematical model on the whole. Got equalizations for the maximally possible loading at a calculation on the maximum states and on possible tensions allows reliably to estimate bearing strength of stringer in both cases. The increase of bearing strength of beam at a calculation on the maximum state is thrice-repeated. Drawn conclusion about adequacy of analysis of bearing strength of stringer.

scholarly journals DEVELOPMENT OF TECHNOLOGICAL PROCESS OF FORMATION OF WIDE FLANGES ON SHEET PROCUREMENTS BY ROLLING STAMPING METHOD

2021 ◽  
pp. 38-45
Author(s):  
Viktor Matviychuk ◽  
Mykola Kolisnyk
Keyword(s):  
Technological Process ◽  
Stable Process ◽  
Power Calculation ◽  
Technological Capabilities ◽  
Induction Method ◽  
Maximum Width ◽  
Distillation Columns ◽  
Second Stage ◽  
Deformed State

The article presents the results of development and research of the technological process of forming wide outer flanges of lids of malt and distillation columns on sheet blanks by rolling stamping. For this purpose, equipment has been developed in the form of a rolling device for a lathe and an autonomous rolling unit, which allow to form the outer flanges with a conical roll. The rolling unit to the lathe provides the presence of coil springs for pressing the roll to the workpiece with the mandrel. Both settings provide the ability to change the angle of the axis of the rolling unit relative to the axis of the mandrel with the workpiece. Studies have shown that the technological capabilities of the process are limited by the corrugation of the flange wall. The power calculation of flanging of external flanges by a conical roll by the SHO method is carried out and formulas for determination of deformation forces are received. The acceptable accuracy of these formulas has been experimentally confirmed, and there is a tendency to increase the error with increasing geometric dimensions of the workpiece. To assess and expand the technological capabilities of the process, an analysis of the formation and deformed state of the workpieces. Since the main danger in the formation of external flanges by the SHO method is the loss of stability in the form of corrugations, the paper obtained an expression for determining the maximum width of the flange under the condition of a stable process. If it is necessary to obtain more developed flanges, it is proposed in the second stage to provide thinning of their wall by drawing with the use, if necessary, heating the workpiece by induction method.

scholarly journals RESERVE CAPACITY OF LONGITUDINAL BEAM OF WAGON TRUCK UNDER THE ACTION OF UNIFORMLY DISTRIBUTED LOADING

2020 ◽  
Vol 1 (154) ◽  
pp. 50-56
Author(s):  
О. Kuznetzov ◽  
О. Rubanenko ◽  
О. Khrenov ◽  
E. Rafalskiy
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Limit State ◽  
Design Stage ◽  
Power Calculation ◽  
Resource Saving ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Allowable Stresses ◽  
Permissible Stresses

Priority directions and measures among the main branches of urban electric transport are resource saving in the subway transportation system during its operation. First of all, this problem must be solved by scientific support, that is, at the stage of designing parts and components of vehicles. One of the main tasks that are solved at the design stage is to increase the load-bearing capacity of the parts by analyzing their stress-strain state. The article is devoted to the calculation of the load capacity reserve of the longitudinal beam of the front subway trolley under the action of evenly distributed over the entire length of the load without taking into account the transverse forces. The priority of the research topic is substantiated, the purpose and tasks are formulated. Two approaches to the power calculation of the bearing capacity of the longitudinal beam are introduced: the calculation of the permissible stresses and the limit state. In both cases elastic models of beams are considered. In the case of calculation on the limit state, the mechanics of the occurrence of plastic hinges at the places of rigid fixing of the ends of the beam are first substantiated. The beam still retains its load capacity. With the further growth of the external load, the emergence of a plastic hinge is justified even in the middle of the beam with the simultaneous loss of the beam of the bearing capacity. To simulate the behavior of the beam according to its characteristics, including the stress and the degradation condition of its load capacity, the mathematical formulation of the problem of calculating the load capacity of the longitudinal beam when calculating the permissible stresses and the limit state without taking into account the transverse force. The load-bearing capacity of the longitudinal beam in the calculation of permissible stresses and the limit state is analyzed. The analysis of the obtained results allows us to judge the effectiveness of the proposed mathematical model as a whole. The obtained equations for the maximum allowable load when calculating the limit state and the allowable stresses allow us to reliably estimate the bearing capacity of the longitudinal beam in both cases. The increase in the bearing capacity of the beam in the case of calculation on the limit is three times. The conclusions about the adequacy of the analysis of the bearing capacity of the longitudinal beam bearing capacity were made. Keywords: resource saving, beam, bearing capacity, allowable stresses, limit state.

scholarly journals Resource-saving technologies of operation of a contact network on the state for city electric transport

2020 ◽  
Vol 2 (58) ◽  
pp. 3-9
Author(s):  
M. Khvorost ◽  
I. Domanskiy ◽  
V. Vasenko
Keyword(s):  
Technology Development ◽  
The State ◽  
Operating Conditions ◽  
Probabilistic Methods ◽  
Contact Network ◽  
Parameter Control ◽  
Electric Transport ◽  
Resource Saving ◽  
Repair Work ◽  
High Level

The work is devoted to solving an urgent task - to develop a complex of scientifically-based proposals of conditions and measures that provide technologies for the operation of electricity traction networks based on energy and resource conservation. The article deals with theoretical and practical issues of technology development and repair of the contact network (CN) on state to ensure the process of passenger transportation. The technical criteria for the status of CN are determined and the technologies of maintenance are offered as monotonically changing parameter control. The set of diagnostic and reliable indicators is offered. Generalized structural diagrams of the system of assessment of the condition of the CN and the ranking of repair work taking into account the possible impact of defects. It is proposed to rank them by three characteristic features: first-class failures in which the CM as a system completely loses its capacity; type 2 failures (partial) in which the effectiveness of the functioning of the CM decreases; failures of the 3rd kind - are noted in the elements of KM for the time of work on the current composition and repair. It is shown that the use of maintenance system according to the state with parameter control is possible if: operating conditions of the CM conditions do not allow the work to failure; KM devices have high functional value with insufficient degree of reserve; there is a high level of operational adaptability and repairability. The basic criteria of the condition of the CM and the quality of current flow are summarized. Technologies based on the synthesis of probabilistic methods of parameter estimation, real diagnostics and simulation modeling of the CM state are proposed. The basic criteria of the condition of KM, which allow to estimate the resource saving during maintenance and repair, are defined.

scholarly journals RESOURCE–SAVING RESERVE OF STRENGTH CHARACTERISTICS OF LONGITUDINAL BEAM OF THE METRO WAGON TRUCK

2018 ◽  
Vol 1 ◽  
pp. 19-28 ◽  
Author(s):  
Aleksandr Kuznetzov ◽  
Vladislav Skurikhin ◽  
Vyacheslav Shavkun
Keyword(s):  
Fold Increase ◽  
Strength Characteristics ◽  
Power Calculation ◽  
Resource Saving ◽  
Limiting State ◽  
Method Of Calculation ◽  
Strength Limit ◽  
Allowable Stresses ◽  
Margin Of Strength ◽  
The Given

In this paper, an analysis of methods for calculating structures from allowable stresses and from limiting states is made. It is shown that when the transition from the longitudinal beam calculation to the allowable stresses to the calculation of the limiting state, the strength limit increases by 1.5 times. A mathematical model of the stress–strain state of a longitudinal beam of metro wagon truck without taking into account the transverse force is developed. The mathematical modeling with the given margin of strength of the power calculation of the longitudinal beam metro wagon track, which is a simple beam of a constant hollow rectangular section, pinched at its ends and loaded along the middle of the span by a concentrated stationary force, is carried out. Thus, the application of the method of calculation for the limiting state makes it possible to identify the resource–saving reserve of the strength characteristics of the longitudinal beam of the metro wagon truck – a 3-fold increase in the maximum permissible load.

Stopping-power determination for compound by EELS

1994 ◽  
Vol 52 ◽  
pp. 948-949 ◽  
Author(s):  
David C. Joy ◽  
Suichu Luo ◽  
John R. Dunlap ◽  
Dick Williams ◽  
Siqi Cao
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Materials Science ◽  
Average Energy ◽  
Stopping Power ◽  
Accurate Information ◽  
Power Calculation ◽  
Coulomb Collisions ◽  
Electron Energy Loss

In Physics, Chemistry, Materials Science, Biology and Medicine, it is very important to have accurate information about the stopping power of various media for electrons, that is the average energy loss per unit pathlength due to inelastic Coulomb collisions with atomic electrons of the specimen along their trajectories. Techniques such as photoemission spectroscopy, Auger electron spectroscopy, and electron energy loss spectroscopy have been used in the measurements of electron-solid interaction. In this paper we present a comprehensive technique which combines experimental and theoretical work to determine the electron stopping power for various materials by electron energy loss spectroscopy (EELS ). As an example, we measured stopping power for Si, C, and their compound SiC. The method, results and discussion are described briefly as below.The stopping power calculation is based on the modified Bethe formula at low energy:where Neff and Ieff are the effective values of the mean ionization potential, and the number of electrons participating in the process respectively. Neff and Ieff can be obtained from the sum rule relations as we discussed before3 using the energy loss function Im(−1/ε).

Regional Policy in the Field of Natural Resources Management in the Far North

2003 ◽  
pp. 108-116
Author(s):  
A. Bykov
Keyword(s):  
Economic Development ◽  
Natural Resources ◽  
Regional Policy ◽  
Natural Resources Management ◽  
Economic Factors ◽  
Resource Saving ◽  
Resources Management ◽  
Legal Norms ◽  
Far North ◽  
The Russian Federation

According to the legal norms of the Russian Federation in the ownership, usage and disposal of natural resources the author analyses interaction between natural resources users and local authorities. The interaction is based upon ecological and economic factors, which cause the peculiarities of requirements put before natural resource users in the Far North. The strategic directions of resource saving economic development of these regions are considered.

Soil Spatial Heterogeneity and Systems of Agriculture

2015 ◽  
Vol 2 (1) ◽  
pp. 50-59
Author(s):  
V. Medvedev
Keyword(s):  
Spatial Heterogeneity ◽  
Soil Cover ◽  
Regular Grid ◽  
Resource Saving ◽  
The Third ◽  
Soil Spatial Heterogeneity ◽  
Agriculture Systems ◽  
Zonal Soils

Aim. To consider soil continuality and discreteness as features of heterogeneity manifestation in a soil cover, important for construction of agriculture systems. Methods. Geostatistical research of soil spatial heterogeneity, revealing the contours of a fi eld with various parameters of fertility. Results. The use of principles of precise agriculture and inspection of indicative properties of fi eld soils using a regular grid allowed to divide a fi eld into contours with three levels of fertility: the fi rst one is characterized by optimal or close to optimum properties which allows refusing from (or reducing substantially) tillage, introduction of fertilizers or chemical ameliorates; the second one has average parameters of fertility corresponding to zonal soils and demands the application of zonal technologies; the third one (with the worst parameters of fertility) presupposes regular use of the improved technologies. Conclusions. The introduction of precise agriculture will allow replacing a traditional zonal system with thenew which is soil-protecting and resource-saving one.

Resource-saving technologies during mining of thin and very thin coal seams

2014 ◽  
Vol 8 (1) ◽  
pp. 55-60
Author(s):  
V Buzylo ◽  
◽  
O Koshka ◽  
S Poimanov ◽  
D Malashkevych ◽  
...  
Keyword(s):  
Coal Seams ◽  
Resource Saving
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