REFINEMENT OF DYNAMIC MODELS OF THE ROD SYSTEMS
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 181, Issue 15
Abstract
The author considers the possibility of applying methods for reducing the dimensionality of dynamic models to rod systems with many degrees of freedom. The research object is the latticed tower. It should be noted that the designs of lattice towers and viewing platforms are very sensitive to dynamic loads. Such influences can be caused by the action of wind, ice, earthquakes, impacts, explosions, pedestrians, but also mechanical failures of some load-bearing elements. The vibrations excited by these effects cover a wide range of frequencies. In the modern analysis of the dynamic behavior of mechanical system, special attention is directed to the development of complex computer models. However, the comparison of the results of numerical simulation and the data of full-scale experiments does not always show their satisfactory coincidence. Therefore, the use of discrete models meets a number of limitations. The structure under study includes a large number of different subsystems and elements. Namely, the inner and outer hardness cores, observation platforms, stairs and enclosing structures. Elements of load-bearing structures of the lattice tower were made of steel, and elements of observation platforms and fences were made of wood. As a result, the dynamic model of the object contained more than a thousand parameters, some of which are known with a certain probability. Developing the dynamic models the initial system was sampled and a system of governing equations of the finite element method were obtained. The main objective of the study is to reduce the model and to identify a small number of variables that determine the dynamics of the system search for the energy "core" of the system. The results of field studies and numerical simulation of the dynamic behavior of a latticed observation tower are presented. By dividing into independent substructures the dimension of the original dynamic models are reduced. In order to verify the obtained models of lower dimension, the simulation results are compared by the finite element method and the data of the full-scale experiment.
Authors and Affiliations
Viktorija Volkova
Keywords
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- EP ID EP535607
- DOI 10.18664/1994-7852.181.2018.156497
- Views 59
- Downloads 0
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