Efficient identification of critical stresses in structures subject to dynamic loads

1986 ◽  
Vol 22 (3) ◽  
pp. 373-386 ◽  
Author(s):  
Ramana V Grandhi ◽  
Raphael T Haftka ◽  
Layne T Watson
Keyword(s):  
Dynamic Loads ◽  
Critical Stresses

scholarly journals DESIGN AND STANDARDIZATION OF BASE FRAME & ANT VIBRATION MOUNTS FOR BALANCED OPPOSED PISTON AIR COMPRESSOR

2012 ◽  
pp. 100-107
Author(s):  
KISHOR D. JADHAV ◽  
MANEET.R. DHANVIJAY
Keyword(s):  
High Speed ◽  
Piston Compressor ◽  
Gas Storage ◽  
Dynamic Loads ◽  
Standard Data ◽  
Gas Processing ◽  
Critical Stresses ◽  
Dynamic Forces ◽  
Effective Design

Now days, Compressors are widely used in gas gathering, gas processing, and gas storage, chemical and refining applications. Compressors are mounted on the Base frame to carry its weight, to maintain its alignment and to assist in carrying the dynamic loads. Compressors base frame needs an effective design technology to ensure its required performance and functions satisfactorily. This paper represents a case study of the compressor base frame on which high speed reciprocating compressors are mounted. Attempts are basically made to standardize base frame for all type of piston compressor. Also, to design deck systems with effective vibration control, which able to sustain the dynamic forces occur in compressor and motor. Secondarily, anti vibration mounts can be select and arranged as they control the vibration of motor and compressor. By using FEA tool approach is made for the investigations of critical stresses. Also, to plot the harmonic responses of the base frame for acceleration with which it vibrate. Finally compare it with the standard data.

Study of the dynamics of ТПА 350 automatic mill working stand elements

2020 ◽  
Vol 76 (8) ◽  
pp. 830-840
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotnii
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Maximum Amplitude ◽  
Calculation Scheme ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Mass Model ◽  
Automatic Mill ◽  
Hollow Billet ◽  
Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

Reducing dynamic loads in the mechatronic system of a rolling mill

2020 ◽  
pp. 45-48
Author(s):  
S.I. Malafeev ◽  
A.A. Malafeeva ◽  
V.I. Konyashin
Keyword(s):  
Direct Current ◽  
Electric Drive ◽  
Rolling Mill ◽  
Correction Method ◽  
System Model ◽  
Dynamic Loads ◽  
Dynamic Processes ◽  
Mechatronic System

A correction method for regulating the mechatronic system of a «DUO-300» rolling mill with a direct current electric drive is considered. The results of the study of dynamic processes in the mechatronic system with the proposed correction are presented. Keywords rolling mill, mechatronic system, model, electric drive, engine, regulator, correction. [email protected]

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