Розробка та аналіз точності методів розрахунку щільності каналів та еквівалентного діаметру каналів беззмащувальних циліндро-поршневих ущільнень
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Файли
Дата
2018
Автори
Тимощук, О.Г.
Tymoshchuk, O.G.
Назва журналу
Номер ISSN
Назва тому
Видавець
Хмельницький національний університет
Анотація
На основі теорії стохастичних процесів розроблені методи розрахунку основних характеристик
контакту спряжених поверхонь беззмащувальних циліндро-поршневих ущільнень. Результатом є створення
інженерних методів розрахунку герметичності (тривалості натікання газу) в беззмащувальних циліндро-
поршневих металополімерних ущільненнях. В статті розглядається пружний контакт сильно анізотропної
шорсткої поверхні (полімерна поверхня) з гладкою (металева поверхня). Поставлено задачу розробити інженерні
методи розрахунку основних характеристик контакту спряжених поверхонь беззмащувальних циліндро-
поршневих металополімерних ущільнень – середньої висоти зазору та питомої площі шорсткої поверхні
контакту, а також виконати аналіз точності розроблених методів.
On the basis of the theory of stochastic processes, methods for calculating the main characteristics of the contact of the conjugated surfaces of the non-greasy cylinder-piston seals are developed. The result is the creation of engineering methods for calculating the tightness (duration of gas leakage) in the non-greasy cylinder-piston metal-polymer seals. The article deals with the elastic contact of a strongly anisotropic rough surface (polymeric surface) with a smooth (metal surface). The task is to develop and investigate engineering methods for calculating the main characteristics of the sealing of the non-greasy cylinder-piston seals - the density of the channels and the equivalent diameter of the channels in the zone of coupling of metal-polymer seals, as well as perform the analysis of the accuracy of the developed methods. the dependence of the density of channels on the complex of contact conditions is of an extreme nature. The channel density (the number of channels per unit of nominal profile length recorded in the transverse direction to the direction of the medium stream) can be calculated as the difference between the surface of contact surfaces that have come into contact and the density of the depressions that are above a given level. Mode of flow of gas in the seal is determined by the Knudsen criterion. On the basis of the formula of the effective level of deformation for a given value of the complex of contact conditions with the help of Kanal [7], written using the software product Mathcad 2000 Professional, the relationship of channel density with the complex of contact conditions is calculated. As the contact conditions increase, the density of the channels initially increases, and then decreases. This is due to the influence of the process of fusion of contact spots in the loading process. The maximum number of channels is reached at K = 0.6315. To determine the channel density, the exact formula is derived. On the basis of the exact formula, the calculated formula is obtained. Values calculated from the exact and calculated channel density formula do not differ by more than 0.0045. Precise formulas of equivalent diameters are derived. Dependence of equivalent diameters from the complex of contact conditions is investigated. On the basis of exact formulas, the calculated formulas of equivalent diameters are obtained. Values calculated on the exact and calculated formula of the consolidated equivalent diameter do not differ by more than 9%, for the consolidated equivalent diameter the difference does not exceed 10%.
On the basis of the theory of stochastic processes, methods for calculating the main characteristics of the contact of the conjugated surfaces of the non-greasy cylinder-piston seals are developed. The result is the creation of engineering methods for calculating the tightness (duration of gas leakage) in the non-greasy cylinder-piston metal-polymer seals. The article deals with the elastic contact of a strongly anisotropic rough surface (polymeric surface) with a smooth (metal surface). The task is to develop and investigate engineering methods for calculating the main characteristics of the sealing of the non-greasy cylinder-piston seals - the density of the channels and the equivalent diameter of the channels in the zone of coupling of metal-polymer seals, as well as perform the analysis of the accuracy of the developed methods. the dependence of the density of channels on the complex of contact conditions is of an extreme nature. The channel density (the number of channels per unit of nominal profile length recorded in the transverse direction to the direction of the medium stream) can be calculated as the difference between the surface of contact surfaces that have come into contact and the density of the depressions that are above a given level. Mode of flow of gas in the seal is determined by the Knudsen criterion. On the basis of the formula of the effective level of deformation for a given value of the complex of contact conditions with the help of Kanal [7], written using the software product Mathcad 2000 Professional, the relationship of channel density with the complex of contact conditions is calculated. As the contact conditions increase, the density of the channels initially increases, and then decreases. This is due to the influence of the process of fusion of contact spots in the loading process. The maximum number of channels is reached at K = 0.6315. To determine the channel density, the exact formula is derived. On the basis of the exact formula, the calculated formula is obtained. Values calculated from the exact and calculated channel density formula do not differ by more than 0.0045. Precise formulas of equivalent diameters are derived. Dependence of equivalent diameters from the complex of contact conditions is investigated. On the basis of exact formulas, the calculated formulas of equivalent diameters are obtained. Values calculated on the exact and calculated formula of the consolidated equivalent diameter do not differ by more than 9%, for the consolidated equivalent diameter the difference does not exceed 10%.
Опис
Ключові слова
контакт, номінальний контактний тиск, питома площа шорсткої поверхні контакту, щільність каналів, еквівалентний діаметр каналів, тривалість натікання газу, беззмащувальні циліндро-поршневі ущільнення, профілограма, теорія стохастичних полів, contact, nominal contact pressure, specific area of the rough surface of the contact, channel density, equivalent diameter of channels, duration of gas flow, non-greasy cylinder-piston seals, profile graph, theory of stochastic fields
Бібліографічний опис
Тимощук, О.Г. Розробка та аналіз точності методів розрахунку щільності каналів та еквівалентного діаметру каналів беззмащувальних циліндро-поршневих ущільнень [Текст] / О. Г. Тимощук // Вісник Хмельницького національного університету. Технічні науки. – 2018. – № 5. – С. 213-220.