Magnetic analysis of the metal structure of critical components of diesel engines is a necessary component of their reliability

2020 ◽

Vol 1 (3) ◽

pp. 210-215

Author(s):

S. P. Lysy ◽

I. A. Polikanova ◽

M. A. Vishnikina

Keyword(s):

Bending Strength ◽

Classical Mechanics ◽

Metal Structure ◽

Theoretical Research ◽

Practical Significance ◽

Rolling Stock ◽

Design Parameters ◽

Experimental Data Processing ◽

Maintenance And Repair ◽

Critical Components

The development of a stand for maintenance and repair of railway equipment units includes theoretical and practical research. Theoretical research is the basis for obtaining practical results. Special attention is paid to the calculations of critical components and parts. By means of the stand, cars, locomotives, electric locomotives and other rolling stock can be brought into working condition. The purpose of the work is to develop a stand for maintenance and repair of railway equipment units. The object of the study is the technological process of the stand for the maintenance and repair of railway equipment units. The scientific novelty of the work is: theoretical justification of the stand design parameters; design and technological scheme of the stand; optimal design and operating parameters of the stand; estimated performance indicators of the stand. The practical significance lies in the use of the stand on the repair sections of the railway, reducing the labor intensity of the work performed, ease of maintenance, and the lowest cost of manufacturing. Theoretical methods were based on the principles of classical mechanics, mathematical analysis, synthesis, modeling, etc. Experimental data processing was performed using the application programs “Compass-3D”, Statistica 6.0, MathCAD. Calculations of the metal structure for bending strength, welded joints, and bed clamps were performed. The calculation of the bending strength of the metal structure was performed and the maximum stresses were found to be within the permissible limits. The condition for the strength of the welded joint is met. The calculation of the bed clips showed that the condition of wear resistance is met.

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The Role of the SLP in Autism Spectrum Disorder Screening and Assessment

Perspectives on Language Learning and Education ◽

10.1044/lle15.2.50 ◽

2008 ◽

Vol 15 (2) ◽

pp. 50-59 ◽

Cited By ~ 1

Author(s):

Amy Philofsky

Keyword(s):

Language Development ◽

Critical Role ◽

Children With Autism ◽

Autism Spectrum ◽

Children With Asd ◽

Prevalence Estimates ◽

Notable Increase ◽

Screening Assessment ◽

Critical Components

AbstractRecent prevalence estimates for autism have been alarming as a function of the notable increase. Speech-language pathologists play a critical role in screening, assessment and intervention for children with autism. This article reviews signs that may be indicative of autism at different stages of language development, and discusses the importance of several psychometric properties—sensitivity and specificity—in utilizing screening measures for children with autism. Critical components of assessment for children with autism are reviewed. This article concludes with examples of intervention targets for children with ASD at various levels of language development.

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Challenges in Isolating the Critical Components of Mindfulness-Based Interventions

PsycEXTRA Dataset ◽

10.1037/e343242004-001 ◽

2003 ◽

Author(s):

James Carmody

Keyword(s):

Critical Components

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Family Involvement, Psychoeducation, and Skills Building Are Critical Components to the Effective Treatment of Pediatric Bipolar Disorder

PsycEXTRA Dataset ◽

10.1037/e520602015-002 ◽

2014 ◽

Author(s):

M.A. Fristad ◽

H.A. MacPherson

Keyword(s):

Bipolar Disorder ◽

Effective Treatment ◽

Family Involvement ◽

Pediatric Bipolar Disorder ◽

Critical Components

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Faith-Based Health Education Project

Californian Journal of Health Promotion ◽

10.32398/cjhp.v1i2.442 ◽

2003 ◽

Vol 1 (2) ◽

pp. 208-222 ◽

Cited By ~ 2

Author(s):

Georgia N. L. Johnston

Keyword(s):

Faith Communities ◽

Face To Face ◽

Staff Members ◽

Community Ownership ◽

Faith Based ◽

Program Success ◽

Project Sustainability ◽

Critical Components ◽

Pastoral Support ◽

Volunteer Commitment

Working with faith communities in health promotion is widely acclaimed and yet not readily practiced. This article describes a study conducted among four faith communities to determine the process required for sustainable faith-based programs. Face-to-face interviews were conducted among 12 community volunteers who participated to identify their perceptions of the project. Two staff members were also interviewed to identify the process from their perspectives. Project-related documents were also analyzed to provide details and triangulate the data from the interviews. The study followed the project for 2 ½ years. Several factors were identified as significant influences on participation and project sustainability. These included value, active pastoral support, program success, and volunteer commitment. The results of this study indicate that pastoral support and faith community ownership are critical components that should be included in faith-based community building efforts.

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КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

Open Information and Computer Integrated Technologies ◽

10.32620/oikit.2020.88.02 ◽

2020 ◽

pp. 15-30

Author(s):

А. Г. Гребеников ◽

И. В. Малков ◽

В. А. Урбанович ◽

Н. И. Москаленко ◽

Д. С. Колодийчик

Keyword(s):

Finite Element ◽

Strain State ◽

Layer Structure ◽

Metal Structure ◽

Element Model ◽

Stress Strain ◽

Element Analysis ◽

Mesh Structure ◽

Stress Strain State ◽

Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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DEVELOPMENT OF THE COMBUSTION CHAMBER OF GAS ENGINE, CONVERTED ON THE BASIS OF DIESELS D-120 OR D-144 ENGINES TO WORK FOR ON LIQUEFIED PETROLEUM GAS

Avtoshliakhovyk Ukrayiny ◽

10.33868/0365-8392-2019-3-259-2-8 ◽

2019 ◽

pp. 2-8

Author(s):

Serhii Kovalov

Keyword(s):

Combustion Chamber ◽

Compression Ratio ◽

Diesel Engines ◽

Combustion Engine ◽

Motor Fuel ◽

Liquefied Petroleum Gas ◽

Gas Engine ◽

Chamber Volume ◽

Motor Fuels ◽

Dynamic Cycle

The expediency of using vehicles of liquefied petroleum gas as a motor fuel, as com-pared with traditional liquid motor fuels, in particular with diesel fuel, is shown. The advantages of converting diesel engines into gas ICEs with forced ignition with respect to conversion into gas diesel engines are substantiated. The analysis of methods for reducing the compression ratio in diesel engines when converting them into gas ICEs with forced ignition has been carried out. It is shown that for converting diesel engines into gas ICEs with forced ignition, it is advisable to use the Otto thermo-dynamic cycle with a decrease in the geometric degree of compression. The choice is grounded and an open combustion chamber in the form of an inverted axisymmetric “truncated cone” is developed. The proposed shape of the combustion chamber of a gas internal combustion engine for operation in the LPG reduces the geometric compression ratio of D-120 and D-144 diesel engines with an unseparated spherical combustion chamber, which reduces the geometric compression ratio from ε = 16,5 to ε = 9,4. The developed form of the combustion chamber allows the new diesel pistons or diesel pistons which are in operation to be in operation to be refined, instead of making special new gas pistons and to reduce the geometric compression ratio of diesel engines only by increasing the combustion chamber volume in the piston. This method of reducing the geometric degree of compression using conventional lathes is the most technologically advanced and cheap, as well as the least time consuming. Keywords: self-propelled chassis SSh-2540, wheeled tractors, diesel engines D-120 and D-144, gas engine with forced ignition, liquefied petroleum gas (LPG), compression ratio of the internal com-bustion engine, vehicles operating in the LPG.

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