Nonlinear dynamic models of constructions, installations and environments in mathematical package Mathcad

Authors

  • D. S. Yaroshenko Department of Metallic, Wooden and Plastic Structures, State Higher Education Establishment “Prydneprovs’ka State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipro 49600, Ukraine
  • A. E. Guslysta Department of Reinforced concrete and Masonry Constructions, State Higher Education Establishment “Prydneprovs’ka State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipro 49600, Ukraine

Keywords:

structural dynamic, differential equations of motion, time domain, design model, algorithm, MathCAD

Abstract

The overwhelming majority of the tasks of the dynamics of structures require a nonlinear analysis in the time domain. But modern software based on the finite element method (FEM) can not always solve such complex problems, taking into account all types of nonlinearities. Therefore, there is a need to develop alternative approaches to solving similar problems. In the article discrete mechanical models of environments and constructions whose differential equations of motion are obtained on the basis of general laws of mechanics are considered. Purpose. Formation of systems of differential equations of motion (SDEM) "manually" - a labor-intensive process, associated with a high probability of errors. The purpose of this study is to identify ways of automated obtaining and numerical solution of SDEM dynamic models of structures of the chain structure. Methodology. To describe the motion of models of constructions and environments, differential equations of motion are used in forms known from the courses of theoretical mechanics and structural mechanics. For symbolic and numerical calculations, the MathCAD mathematical package is used. Findings. The results of work on the development of methods for modeling nonlinear dynamics of building objects, environments are presented. The ways of automated acquisition of SDEM for models of the chain structure are shown. On the example of a dynamic beam model in the form of a "straight-line method" and a displacement method, it was found that the equations of motion of such a structure can be obtained both in reverse and in direct way (which essentially extends the possibilities of automation for the acquisition of SDEM of such structures). Practical value. The proposed algorithms can be used in the development of software for modeling the dynamics of buildings and structures.

Author Biographies

D. S. Yaroshenko, Department of Metallic, Wooden and Plastic Structures, State Higher Education Establishment “Prydneprovs’ka State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipro 49600

Cand. Sc. (Tech.)

A. E. Guslysta, Department of Reinforced concrete and Masonry Constructions, State Higher Education Establishment “Prydneprovs’ka State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipro 49600

Cand. Sc. (Tech.), Associate Prof.

References

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Published

2017-10-24

Issue

Section

Computer systems and information technologies in education, science and management