Nonobvious features of dynamics of circular cylindrical shells

Leizerovich, G. S.; Taranukha, Nikolay A.

doi:10.3103/s0025654408020106

Cited by 7 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Â óêàçàííîé ëèòåðàòóðå áîëüøîå âíèìàíèå óäåëÿåòñÿ îáîëî÷êàì âðàùåíèÿ, â ÷àñòíîñòè öèëèíäðè÷åñêèì. Ðÿä ðåçóëüòàòîâ ðåøåíèé äëÿ öèëèíäðè÷åñêèõ îáîëî÷åê, â òîì ÷èñëå è âçàèìîäåéñòâóþùèõ ñî ñðåäîé, ïðåäñòàâëåí â ñòàòüÿõ è ìàòåðèàëàõ äèññåðòàöèé [13][14][15][16][17][18][19][20][21][22][23]. Ñëåäóåò îòìåòèòü, ÷òî â ëèòåðàòóðå ìàëî âíèìàíèÿ óäåëÿåòñÿ îáîëî÷êàì êîíå÷íûõ ðàçìåðîâ è ñðàâíèòåëüíîìó àíàëèçó ðåçóëüòàòîâ àíàëèòè÷åñêèõ è ÷èñëåííûõ ðåøåíèé, â ÷àñòíîñòè, ñ èñïîëüçîâàíèåì ìåòîäà êîíå÷íûõ ýëåìåíòîâ.…”

Section: ââåäåíèåunclassified

Analytical and Numerical Studies of Free Vibrations of Cylindrical Shell With Acoustic Medium

Dyachenko

Mironov

2021

PSP

View full text Add to dashboard Cite

The research materials are related to the problem of ensuring vibration resistance of pipelines exposed to dynamic loads, for which increased vibration is the main cause of damage. The solution to this problem involves studying the parameters of free vibrations of the structure. The paper solves the problem of determining the natural frequencies and forms of vibrations of a section of a circular cylindrical shell filled with an medium considered in the acoustic approximation. The results of studies of the parameters of free vibrations were obtained both by the analytical method of shell theory based on the Kirchhoff-Love hypotheses, and using the finite element complex of engineering analysis ANSYS. It is shown that the influence of the medium density on the parameters of free vibrations of the shell depends on the ratio of the shell thickness to its radius it turns out to be significant only for the shape of vibrations associated with bending deformation, and insignificant for forms associated with deformations of the middle layer. A comparative analysis of the results of calculations obtained for models of compressible and incompressible medium shows that when solving the problem of determining the parameters of free vibrations of the shell, the compressibility of the medium can be neglected. At the same time, to solve practical problems that require taking into account the full spectrum of natural frequencies of the shell–medium system, a compressible medium model should be used, in which the results on the effect of shell stiffness on the frequency spectrum of the medium volume are obtained. When solving practical problems of pipeline systems vibration, the use of the finite element method in a coupled formulation is an effective tool that allows us to consider all physical processes taking into account their mutual influence on each other.

show abstract

Section: ââåäåíèåunclassified

Analytical and Numerical Studies of Free Vibrations of Cylindrical Shell With Acoustic Medium

Dyachenko

Mironov

2021

PSP

View full text Add to dashboard Cite

show abstract

Tensile Model of a Shell-Type Flat Plate at Different Displacement Velocity Fields

Grigoryeva

Khromov

Grigoryev

2021

Current Problems and Ways of Industry Development: Equipment and Technologies

View full text Add to dashboard Cite

Nonobvious Obstructive Meibomian Gland Dysfunction

Blackie

Korb

Knop

et al. 2010

Cornea

128

View full text Add to dashboard Cite

This review presents the rationale and supporting data for a recent paradigm shift in our understanding of meibomian gland dysfunction (MGD). The historical understanding of MGD has been that of an infectious hypersecretory disorder with obvious signs of inflammation, hypersecretion, and purulent excreta. The current understanding of MGD now includes the polar concept of a less obvious or nonobvious type of hyposecretory obstructive MGD, where inflammation and other signs of pathology may be absent unless special examination techniques are employed. A new term, nonobvious obstructive MGD (NOMGD), is used to describe what may be the most common form of obstructive MGD. Obstructive MGD is an area of growing importance because obstructive MGD is now recognized to be the most common cause of evaporative dry eye, and because NOMGD seems to be the precursor to obvious obstructive MGD, it is also an important area to understand. The prevalence of NOMGD seems to be very high but currently significantly underdiagnosed. This review presents the relevant anatomy and physiology, concepts of obstructive MGD, the usual absence of inflammation in obstructive MGD, nomenclature and classification of obstructive and NOMGD, clinical diagnosis of NOMGD emphasizing the necessity for diagnostic expression, the use of a new instrument for diagnostic expression providing a standardized method of assessing meibomian gland functionality, the complementary roles of the aqueous and lipid layers, and the specific treatment of NOMGD, emphasizing that the success of treatment of all forms of obstructive MGD is dependent on the relief of the obstruction.

show abstract

Nonobvious features of dynamics of circular cylindrical shells

Cited by 7 publications

References 1 publication

Analytical and Numerical Studies of Free Vibrations of Cylindrical Shell With Acoustic Medium

Analytical and Numerical Studies of Free Vibrations of Cylindrical Shell With Acoustic Medium

Tensile Model of a Shell-Type Flat Plate at Different Displacement Velocity Fields

Nonobvious Obstructive Meibomian Gland Dysfunction

Contact Info

Product

Resources

About