Estimation of heat flux and temperature distributions in a composite strip and homogeneous foundation

Yang, Yu−Ching; Chu, Shao−Shu; Chang, Win−Jin; Wu, Tser‐Son

doi:10.1016/j.icheatmasstransfer.2010.02.005

Cited by 31 publications

(3 citation statements)

References 11 publications

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“…During automatic control of a step-by-step gearbox, the choice of the moment of inclusion of this or that drive is provided with the accounting a minimum of three information parameters, such as loadings of the engine, speed of movement, and the drive which have been switched on at the moment of switching [5][6][7]. Besides, in a control system of a gear case there should be provided a possibility of correction of the law of a gear shift depending on speedup developed by the vehicle [9][10]. The automatic gear case excludes rupture of a stream of power at transition from the least drive on the increasing one.…”

Section: Resultsmentioning

confidence: 99%

Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contact

et al. 2019

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The analysis showed the following tendencies of development and energy efficiency of designs of gearboxes for track machines: provision of a maximum level of efficiency, removal of rupture of a stream of the passed capacity, provision of a high level of reliability, decrease of power input on gearbox work, provision of convenience, simplicity of service and steering, engine braking maintenance, and also maintenance of a relatively low cost. The above-mentioned tasks are performed by including clutch pinion gears with the built in frictional amplifier elements in an automatic gearbox, and also during the effect of dynamic anisotropy of frictional bonds. Besides a torque transfer, the clutch gear carries out a safety clutch function. That means that there is sliding at a high rotational power. Factor of strengthening of the given link is Кstr → ∞ due to occurence of dynamic anisotropy of frictional bonds. Physical and mechanical characteristics of contacting surfaces are formed in the course of dynamic interaction of roughnesses in friction units at modes of dry and boundary friction. Essential-nonlinear friction processes, interconnected with dynamic processes on the contact area, define values of target characteristics of frictional system. They can fluctuate in a very wide range. The friction factor fmp for the same friction units at preservation of constant conditions and friction parameters can vary from zero to infinity that is an essence of dynamic anisotropy of frictional bonds.

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Section: Resultsmentioning

confidence: 99%

Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contact

et al. 2019

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“…Производители таких агрегатов пытаются полностью отказаться от системы смазки. В малоразмерных агрегатах возможно применение самосмазывающихся подшипников [5,6]. При создании таких агрегатов требуется методика для анализа температурного состояния и температурных деформаций ротора и опорно-упорных узлов.…”

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Research of temperature deformations of selflubricating tapered bearings of low-consumption rotor units

Raykovskiy¹,

Yusha²,

Tretyakov³

et al. 2019

OSB

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Омский государственный технический университет, г. Омск 2 ПАО «ОНХП», г. Омск иССлеДоВАние теМперАтУрных ДефорМАЦий САМоСМАзыВАющихСя КоничеСКих поДшипниКоВ МАлорАзМерных роторных АгрегАтоВ Применение самосмазывающихся подшипниковых узлов конической формы, реализованных по схеме «ротапринтного» смазывания, перспективно в безмасляных малоразмерных турбоагрегатах для обеспечения заданного ресурса. При этом важным вопросом, особенно для микротурбин, является обеспечение требуемых температурных режимов и допустимых температурных деформаций. В работе предложена численная методика расчета конических подшипниковых узлов, реализованных по схеме «ротапринт» с различным количеством намазывающих элементов, которая учитывает взаимное влияние режимов работы турбоагрегата и системы охлаждения подшипника. Методика состоит из двух этапов: на первом определяются температурные поля, затем результаты переносятся в качестве исходных данных для второго этапаопределение полей температурных деформаций. Результаты расчета деформаций служат исходными данными для теплового расчета по скорректированным геометрическим размерам, таким образом выполняется итерационный расчет до требуемой сходимости. Выполнена апробация и приведены результаты анализа температурного состояния и температурных деформаций для различных углов конуса подшипникового узла при различном количестве намазывающих элементов применительно к подшипникам как со стороны компрессора, так и со стороны турбины при консольном их исполнении. Ключевые слова: самосмазывающийся конический подшипник, малорасходный турбоагрегат, численная методика, тепловое состояние, температурные деформации.

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“…RSTU scientists have carried out the theoretical basics of an amplitude-phase-frequency analysis of essential-nonlinear dynamic processes. These processes take place in mechanical systems with friction units [2][3][4] with the subsequent synthesis of frictional systems with optimum tribotechnical and dynamic parameters. Moreover, our researchers have developed methods of physical and mathematical modelling and dynamic monitoring of nonlinear mechanical systems [3].…”

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confidence: 99%

Application of Tribology Theoretical Bases for Working Out of Resource-Saving Systems on Railway Transportation

Shapovalov¹,

Lubyagov²,

Kharlamov³

2017

Transport Problems

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In this article we consider the increase of the resource of wheelsets of cars and locomotives. We give general data on present research in the field of tribotechnical systems, and offer alternative variants of development of domestic tribotechnical systems for railway transportation, which can be useful to replace foreign systems. The systems capable of increasing the reliability of a railway branch are described.

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Estimation of heat flux and temperature distributions in a composite strip and homogeneous foundation

Cited by 31 publications

References 11 publications

Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contact

Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contact

Research of temperature deformations of selflubricating tapered bearings of low-consumption rotor units

Application of Tribology Theoretical Bases for Working Out of Resource-Saving Systems on Railway Transportation

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