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К расчёту на прочность деталей роторов

К расчёту на прочность деталей роторов

Abstract

Рассмотрены недостатки прочностного расчета обечаек роторов, использующих безмоментную (мембранную) теорию расчета. Дана формула для оценки погрешности расчета. В решении дифференциального уравнения равновесия элемента изотропного упругого тела, известного как уравнение равновесия Навье-Стокса, обнаружен парадоксальный характер изменения радиальных и кольцевых напряжений во вращающихся деталях. Предложен оригинальный способ вывода формул для вычисления радиальных и кольцевых напряжений в деталях, работающих под воздействием центробежных (инерционных) сил, опирающийся только на принцип Даламбера; получены новые формулы для вращающихся дисков любого профиля, исправляющие неестественный характер известных решений. Выведены формулы для вращающихся дисков известных профилей, которые существенно отличаются от известных формул. Предлагается изменить подход к решению дифференциальных уравнений Навье‒Стокса при наличии внутренних сил и внести коррективы в инженерные методы прочностного расчета опасных в эксплуатации вращающихся деталей машин.

Considered the stress calculation’s disadvantages of rotor’s shells which used a membrane theory calculation.Offered formula for error estimation. Detected the paradoxical nature of the solution of the differential equation of element’s equilibrium (Navier-Stokes equation of equilibrium) in the determination of the tangential and radial (1st and 2nd principle) stresses in rotating components. Proposed an original way of deriving formulas for calculating the tangential and radial stresses in rotating parts based on d’Alembert’s principle only. Obtained the new formulas for rotating disks of any geometry configuration, correcting unnatural known solutions. Derived new formulas for rotating disks of common types, significantly different from the known formulas. Proposed changes in the approach to the solution of the Navier-Stokes differential equations in the presence of internal forces and make adjustments to the stress calculation of dangerous rotating parts.

Keywords

ТЕОРИЯ УПРУГОСТИ, КОЛЬЦЕВЫЕ И РАДИАЛЬНЫЕ НАПРЯЖЕНИЯ, ВРАЩАЮЩИЕСЯ ДЕТАЛИ, TANGENTIAL AND RADIAL (1ST AND 2ND PRINCIPLE) STRESSES

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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