USE OF DIMENSIONAL ANALYSIS FOR DETERMINING THE DYNAMIC COEFFICIENT OF THE CRANE SUPPORTING STRUCTURE CAUSED BY DRIVING OVER UNEVEN RAILS

2017 ◽  
Vol 184 (2) ◽  
pp. 165-174
Author(s):  
Marcin JASIŃSKI
Keyword(s):  
Qualitative Analysis ◽  
Dimensional Analysis ◽  
Dynamic Load ◽  
Similarity Theory ◽  
Theory Model ◽  
Dynamic Coefficient ◽  
Supporting Structure ◽  
Dynamic Coefficients ◽  
Applied Method ◽  
Current Standards

The paper presents a way of describing the vertical dynamic load of the crane supporting structure caused by driving over uneven surfaces with the use of a dimensional analysis and similarity theory model. The applied method allows to conduct an initial, theoretical and qualitative analysis and to designate dimensionless parameters affecting the studied process. The obtained values were compared with the dynamic coefficients calculated on the basis of current standards.

scholarly journals Study of the nature of the dynamic coefficient of internal friction of grainmaterials

2019 ◽  
Vol 135 ◽  
pp. 01102
Author(s):  
Dmitriy Savenkov ◽  
Oleg Kirischiev ◽  
Ylia Kirischieva ◽  
Tatiana Tupolskikh ◽  
Tatiana Maltseva ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Internal Friction ◽  
Agricultural Production ◽  
Mechanical Characteristics ◽  
Dynamic Coefficient ◽  
Bulk Materials ◽  
Dynamic Coefficients ◽  
Internal Friction Coefficient ◽  
Physical And Mechanical Characteristics

The article highlights the issues related to the study of physical and mechanical characteristics of bulk materials, namely internal friction coefficients in static and dynamic modes. An innovative device of the carousel type for determining the frictional characteristics of bulk materials is described, which allows to implement the tasks of practical determination of dynamic coefficients of internal friction. Presented the program, methodology and results of research on the practical study of the internal friction coefficient of typical bulk products of agricultural production in the range of linear velocities of displacement of layers from 0 to 2.79 m/s, the reliability of which is not lower than 0.878.

Dynamic testing of a corrugated steel arch bridge

2008 ◽  
Vol 35 (3) ◽  
pp. 246-257 ◽  
Author(s):  
Zbigniew Manko ◽  
Damian Beben
Keyword(s):  
Vibration Frequency ◽  
Dynamic Load ◽  
Critical Speed ◽  
Dynamic Testing ◽  
The Other ◽  
Steel Plates ◽  
Highway Bridge ◽  
Dynamic Coefficients ◽  
Bridge Structures ◽  
Load Tests

The paper presents the results and conclusions of dynamic load tests that were conducted on a highway bridge over the Gimån River in Sweden made of Super Cor corrugated steel plates (CSP), the first bridge of this type in Scandinavia. The critical speed magnitudes, dynamic coefficients, velocity vibration, and vibration frequency are determined in the paper. Conclusions drawn from the tests can be most helpful in the assessment of the behaviour of this type of corrugated plate – soil bridge. In consideration of the application of this type of structure in the case of small-to-medium span bridges, the conclusions from this research cannot yet be generalized to all types of such solutions. The application details with respect to all types of such bridge structures would require additional analysis (field and model tests and calculations) on the other types of soil–steel bridges.

scholarly journals Assessing, measuring and modelling erosion in calanchi areas: a review

2016 ◽  
Vol 47 (4) ◽  
pp. 181 ◽  
Author(s):  
Nathalie Almaru Caraballo-Arias ◽  
Vito Ferro
Keyword(s):  
Dimensional Analysis ◽  
Recent Literature ◽  
Similarity Theory ◽  
Rapid Development ◽  
The Self ◽  
Geometric Features ◽  
Self Similarity ◽  
Full Size ◽  
Space And Time ◽  
Geomorphic Processes

Calanchi are erosion landforms characterised by a heavily dissected terrain with steep, unvegetated slopes and channels with a dendritic pattern, which rapidly incise and extend headwards. Recent literature focusing on badland systems highlights their similarity with other larger fluvial landforms, stating that these behave as a full size laboratory, due to their rapid development in space and time and to the diversity of geomorphic processes involved. In this paper, a brief review of the most important results on badland research is firstly presented. Then, the morphometric similarity between calanchi and other erosion landforms is discussed. Finally, models quantitatively relating the volume of sediments eroded from calanchi landforms and a set of geometric features of their tributary areas, by exploiting the dimensional analysis and the self-similarity theory, are presented.

scholarly journals The Application of Similarity Theory and Dimensional Analysis to the Study of Centrifugal-Rotary Chopper of Forage Grain

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4501
Author(s):  
Wacław Romaniuk ◽  
Petr Savinykh ◽  
Kinga Borek ◽  
Kamil Roman ◽  
Alexey Y. Isupov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dimensional Analysis ◽  
Similarity Theory ◽  
Empirical Relationship ◽  
Vertical Axis ◽  
Similarity Criteria ◽  
Technological Parameters ◽  
Initial Stage ◽  
Wide Range ◽  
Working Bodies

This article presents the device and the principle of operation of forage grain crushers that use the centrifugal force of inertia to supply the working bodies—which occurs as a result of rotation of the rotor with a vertical axis. The results of some tests of machines working on this principle have been characterized. Attention is drawn to the disadvantages of most research works, namely the lack of premises for creating shredders of this class with a wide range of performance. The aim of this work is to establish the relationship between the design and technological parameters for the operation of a centrifugal-rotary shredder using the theory of similarity and a dimensional analysis. Moreover, the experimental data show an empirical relationship when calculating the efficiency for the shredder model considered above. By applying the similarity criteria, dimensionless complexes were obtained, which allow to determine the significance of the parameters selected at the initial stage for the efficiency of the shredder. The novelty of this research is the application of the theory of similarity and the use of dimensional analysis, which allowed for scaling the results of the experimental data and obtaining a centrifugal-rotary shredder with higher efficiency, while maintaining the quality of the obtained product. This technique indicates the energy costs of the grinding process, which can be used to select the ratio of parameters in the shredder that would ensure that a minimum amount of energy is consumed.

Research on the Influence of Dynamic Load on Suspended Monorail

2015 ◽  
Vol 806 ◽  
pp. 23-29
Author(s):  
Viktor Gutarevych ◽  
Nataliia Vodolaskaya ◽  
Esad Jakupović ◽  
Dragoljub Mirjanić
Keyword(s):  
Dynamic Load ◽  
Moving Load ◽  
Inertial Forces ◽  
Dynamic Coefficient ◽  
Dynamic Forces

The influence of the moving load on suspended monorail was studied. During the movement of suspended carriages were established inertial forces, which lead to the additional monorail curvature. Found the dependence of the maximum dynamic load of the trucks speed along the monorail. Established speed of truck at which load of the monorail is practically static. The dependence of the bending section of the monorail under the influence of moving dynamic forces and the value of dynamic coefficient for suspended monorail track were found.

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