Dynamic stability of thin walled beams under traveling horizontal follower load systems

Hollow thin-walled high pier is a common form of high pier in mountainarea, so it is of practical significance to the dynamic stability analysis ofhollow thin-walled high pier in mountain area. This paper is taking themountainous area of a hollow thin-walled high pier as the background, and theestablishment of the fiber model with Midas for dynamic elastic-plastic timehistory analysis. The results show that: the hollow thin-walled high pier underthe impact load, load amplitude is lower than the critical load,and the dynamic response characteristics of thestructure of the value parameter i.e. horizontal displacement at pier top increaseslinearly with the load amplitude. When the load amplitude is larger than thecritical load, the horizontal displacement of pier top increases with theincrease of load amplitude nonlinearly. Power under dynamic load instabilitycritical load is about 80% under static load.

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Influence of the Longitudinal Compressive Force on Parametric Vibrations and Dynamic Stability of Thin-Walled Above-Ground Steel Oil Pipelines with Large Diameter

International Scientific Conference Energy Management of Municipal Transportation Facilities and Transport EMMFT 2017 - Advances in Intelligent Systems and Computing ◽

10.1007/978-3-319-70987-1_71 ◽

2017 ◽

pp. 666-678

Author(s):

Vladimir Sokolov ◽

Igor Razov

Keyword(s):

Dynamic Stability ◽

Large Diameter ◽

Compressive Force ◽

Parametric Vibrations ◽

Oil Pipelines ◽

Thin Walled

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TECHNOLOGICAL FIXTURES FOR MACHINING LARGE-SIZED THIN-WALLED SHELLS OF COMPLEX PROFILE

Cutting & Tools in Technological System ◽

10.20998/2078-7405.2021.94.04 ◽

2021 ◽

pp. 28-41

Author(s):

Svitlana Oliinyk ◽

Lydmila Kalafatova

Keyword(s):

Dynamic Stability ◽

Frequency Spectrum ◽

Dynamic Characteristics ◽

Technological System ◽

Complex Profile ◽

Study Results ◽

Thin Walled ◽

Grinding System

The paper analyzes the structure of technological fixtures for the positioning and fixing of large-sized thin-walled pyroceram shells as a factor affecting the dynamic characteristics of the grinding system. The solution to the problem of ensuring the dynamic stability of the «mandrel-workpiece» subsystem is necessary to increase the efficiency of shell machining in present conditions. Studying the vibrations frequency spectrum of the technological system during grinding has made it possible to determine their sources. The magnitude and frequency of vibrations depend on the mandrel structure - the clamping fixture. The study results are the requirements for a new mandrel structure, considering the dynamic stability of the technological system.

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