Alexander Rodikov

• Software Engineer at Bryansk State Technical University

A method for modeling the dynamics of flexible bodies allowing an arbitrary gross motion, large elastic displacements and small deformations is considered. Equations of motion are derived in absolute nodal coordinates by finite element method using the known Craig-Bampton approach. The method is intended for modeling elastic solids, shells and rods...

Equations of motion of flexible bodies in absolute coordinates. Implementation in Universal Mechanism software. Verification. Application in well drilling dynamics, flexible tire, air spring bellows and spring models.

Modeling of pneumatic suspension of railway vehicles in Universal Mechanism software is discussed. The suspensions include air springs which can be connected with auxiliary chambers by pipelines or orifices. The models can include height control valves.

Optimization of railway wheel profile with Universal Mechanism software

The second part of the paper includes numerical tests verifying equations of motion of flexible bodies in absolute coordinates with rectangle and isosceles trapezoid finite elements. The equations are formulated in the first part of the paper. The verification is based on three types of problems: calculation of natural frequencies and modes, evalua...

Equations of motion of a finite element in absolute coordinates including mass matrix, generalized inertia and internal forces are derived. A trapezoidal element for dynamic models of flexible shells in the shape of surface of revolution is considered. The element can be used for modeling dynamics of automotive tire and air spring bellows and some...

The second part of the paper continues a discussion on the topic of parallel computations in railway dynamics. The algorithms described in the first part of the paper are applied to parallel simulation on computers with multicore processors of six different models of rail vehicles and trains with the number of degrees of freedom from about one hund...

Parallel computations speed up simulation of multibody system dynamics, in particular, dynamics of railway vehicles and trains. It is important for reduction of required time at the stage of new railway vehicle design, for increase of complexity of studied problems and for real-time applications. We consider realization of parallel computations in...

An algorithm for computer modeling of the processes of wear and accumulation of the rolling contact fatigue (RCF) damage in railway vehicle wheels is introduced. The combined criterion of contact fatigue is obtained on the basis of the specific strain energy and of the criterion theories of strength. The proposed criterion is tested on the Hertzian...

Based on the large general multi-body dynamics simulation and analysis platform Universal Mechanism( UM) ，a professional computer program UM Maglev is developed for the coupling vibration simulation of maglev train-track beam． The maglev train is set as multi-rigid-body model，the stiffness and damping of springs and dampers are regarded as linear o...

Two simulation techniques for analyzing flexible wheelset dynamics are presented. They are applied within multibody approach and implemented in "Universal mechanism" software. Equations of wheelset motion are derived using floating frame of reference and component mode synthesis methods. Modal analysis is carried out in external FEA software. Kinem...

The aim of the paper is to present the approach for simulation of dynamics of the systems consisting of railway vehicle, flexible track and flexible foundation. Railway vehicles are considered as multibody systems that include rigid or flexible bodies, joints and force elements. The track model is considered as a periodic 3D structure consisting of...