Mathematical modeling of the process of deformation and stressing of pipelines under the action of dynamic loads

2020 ◽  
Vol 0 (1 (3)) ◽  
Author(s):  
Andriy Oliynyk ◽  
Lidiia Feshanych
Keyword(s):  
Mathematical Modeling ◽  
Dynamic Loads

scholarly journals Simulation of Loads on the Carrying Structure of an Articulated Flat Car in Combined Transportation

2018 ◽  
Vol 7 (4.3) ◽  
pp. 140 ◽  
Author(s):  
Alyona Lovska ◽  
. .
Keyword(s):  
Mathematical Modeling ◽  
Finite Element Method ◽  
Structural Strength ◽  
Construction Material ◽  
Dynamic Loads ◽  
Capacity Analysis ◽  
The Finite Element Method ◽  
Solid Works ◽  
Loading Modes ◽  
Strength Modeling

The article presents the findings of the research into loading on the carrying structure of an articulated flat car under combined transportation. The refined data of dynamic loads on the carrying structure of a flat car under train ferry transportation, as well as the main loading modes in rail track operation were determined by mathematical modeling. The adequacy of the models developed was checked with an F-test. The results of the calculation conducted made it possible to conclude that the hypothesis on adequacy of the models is not rejected. The peculiarities of the structural strength modeling for a flat car within operational loading diagrams are given. The graphics works were conducted in Solid Works. The capacity analysis was conducted by the finite element method in CosmosWorks. The 09G2S steel was used as a construction material. It is determined that the maximum equivalent loads in the flat car support structure do not exceed the admissible loads. Results of the research can be used in designing coupled flat cars to provide their capacity at mixed transportation. 

scholarly journals Dynamics and Strength of Circular Tube Open Wagons with Aluminum Foam Filled Center Sills

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1915
Author(s):  
Oleksij Fomin ◽  
Mykola Gorbunov ◽  
Alyona Lovska ◽  
Juraj Gerlici ◽  
Kateryna Kravchenko
Keyword(s):  
Mathematical Modeling ◽  
Aluminum Foam ◽  
Natural Frequencies ◽  
Circular Tube ◽  
Dynamic Loads ◽  
Oscillation Modes ◽  
Absorbing Material ◽  
Foam Filled ◽  
Energy Absorbing ◽  
Tube Structure

The study deals with an application of aluminum foam as an energy-absorbing material for the carrying structure of a rail car. The material is particularly recommended for circular tube carrying structures. The authors conducted mathematical modeling of dynamic loads on the carrying structure of an open wagon that faces shunting impacts with consideration of the center sill filled with aluminum foam. It was established that the maximum accelerations on the carrying structure of an open wagon were 35.7 m/s2, which was 3.5% lower in comparison with those for a circular tube structure without a filler. The results obtained were proved by computer modeling. The strength of the carrying structure of an open wagon was also calculated. It was established that aluminum foam applied as a filler for the center sill decreased the maximum equivalent stresses in the carrying structure of an open wagon by about 5% and displacements by 12% in comparison with those involving the circular tube carrying structure of an open wagon without a filler. The natural frequencies and the oscillation modes of the carrying structure of an open wagon were defined. The designed models of the dynamic loading of the carrying structure of an open wagon were verified with an F-test.

scholarly journals Mathematical model of the volumetric hydrodrive’s dynamics, sensitive to the loading variation

2018 ◽  
Vol 224 ◽  
pp. 02100 ◽  
Author(s):  
Alexandra Ivanovskaya ◽  
Vladimir Popov
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Characteristic Feature ◽  
Hydraulic Drive ◽  
Drive System ◽  
Operating Principle ◽  
Dynamic Loads ◽  
Dynamic Processes ◽  
Hydromechanical System

The paper deals with the problems of mathematical modeling of the dynamic processes proceeding in a complex hydromechanical system of the ship’s deck load-lifting devices. The characteristic feature of this class of equipment is the operation in special conditions, i.e, under the influence of external hydrometeorological factors, taking into account variations in the parameters of lifted or lowered cargo. With a view to gradual regulation of the change of torque on the working drum to reduce dynamic loads, it is offered to use a hydraulic drive that is sensitive to the variation of loading. The operating principle of the considered volumetric hydraulic drive is described. The received mathematical model allows to establish influence of the hydrodrive parameters on transients in a drive system.

scholarly journals Parametric Study on the Effects of Soil to Oscillation Velocity / Parametrická Studie Vlivu Typu Zeminy Na Amplitudu Rychlosti Kmitání

2012 ◽  
Vol 12 (2) ◽  
pp. 123-131 ◽  
Author(s):  
Tomáš Petřík ◽  
Eva Hrubešová ◽  
Martin Stolárik ◽  
Miroslav Pinka
Keyword(s):  
Mathematical Modeling ◽  
Finite Element Method ◽  
Finite Element ◽  
Soil Properties ◽  
Dynamic Load ◽  
Parametric Study ◽  
Civil Engineering ◽  
Dynamic Loads ◽  
Experimental Measurements ◽  
Oscillation Velocity

Abstract The paper focuses on the possibility of evaluating the influence of character of the soil to oscillations velocity induced dynamic loads. Mathematical modeling is used to solve the parametric study. Models are created in software Plaxis 2d based on finite element method. Dynamic load is based on experimental measurements on the stand in the area of the Faculty of Civil Engineering, VSB-TUO. Soil properties are determined from the normative indicative characteristics.

Cerebral Blood Circulation in Premature Infants by Means of Mathematical Modeling

2015 ◽  
Vol 46 (S 01) ◽  
Author(s):  
R. Lampe ◽  
N. Botkin ◽  
V. Turova ◽  
T. Blumenstein ◽  
A. Alves-Pinto
Keyword(s):  
Mathematical Modeling ◽  
Premature Infants ◽  
Blood Circulation ◽  
Cerebral Blood Circulation
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