Roman Kovalev

• Bryansk State Technical University

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...

Principles of the management system asynchronous traction drive hybrid shunting locomotive at the limit of adhesion of the wheels and rails in modes of traction and electrical braking and procedures for the development of complex Electromechanical model of the locomotive, the results of the simulation of the dynamics of the acceleration of the loco...

Examines the dynamic processes in the traction drive with direct torque control regulation asynchronous traction motors are connected in parallel to one inverter, at the limit of adhesion of the wheels and rails, the results of the simulation.

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...

A heavy haul train and car dumper model was created to analyse train longitudinal dynamics during dumping. Influence of such factors as performance curve of draft gears, total free slack in couplers, operating mode of train positioner and braking of last two cars of train on the in-train forces was considered.

The method of electromechanical system of electric bridge crane with asynchronous motors modeling, which provides a skew correction and lateral displacement of the crane with high speed and accuracy, is presented. Results of modeling are shown. The direct torque control system is applied to control asynchronous motors. Four contactless distance sen...

A massless track-wheel-terrain interaction model for the real-time simulation of tracked vehicles is suggested. The model is oriented for simulation of tracked vehicles on highly non-smooth urban and industrial terrains that include such elements like stairs, vertical obstacles etc. The suggested model provides realistic tracked vehicle dynamics an...

Seismoscopes had already existed for a while before the first expedient seismometers were constructed at the end of the 18th century. The most famous one, which every undergraduate student of geosciences knows, is Zang Heng's (also referred to as Choko and Tyoko “didongy” (earth movement instrument) of A.D. 132 (Dewey and Byerly 1969). An education...

The present paper describes the CAE-based approach for analysis of dynamics of a coupled model of flexible railway bridge and train [3, 5, 6]. The approach is being implemented in Universal Mechanism (UM) software. The railway bridge is considered as a flexible multibody system. Dynamics of flexible bodies is simulated using data imported from fini...

The program which is intended for the simulation of train derailment processes and the identification of causes of derailments is considered in this paper. Train derailments can be caused by many reasons. In some derailment cases, the causes of derailments are obvious, for example railway vehicle or track faults, obstacles on the tracks and so on....

Computer models of freight cars with three-piece and Y25 bogies are considered and compared. Efficient numeric methods for simulation of vehicle models in the presence of frictional contacts are discussed. Some simulation results on derailment safety analysis and influence of track gauge value on freight-car dynamics are presented. Methods of stres...

Mathematical models of freight cars, numerical methods, simulation results and some related topics such as safety, durability, wear are considered in this paper. Introduction Railway industry needs in accurate models of freight cars. It is a very important problem because this type of rail vehicles substantially defines operating costs of railway t...

Based on combination of program packages MatLab and Universal Mechanism, a computer model of electromechanical system for a mainline diesel locomotive is developed.

The present paper describes the CAE-based approach for durability analysis that is being implemented in Universal Mechanism software to predict the fatigue damage of parts of mechanical systems. The approach predicts fatigue strength of structural components of machines and mechanisms based on results of simulating their dynamics taking into accoun...

A significant part of a computer-aided model of a railway vehicle is the description of forces at contact between wheel and rail. Computation of these forces is one of the most time-consuming CPU operations during the simulation process. Mathematical models of the contact forces often lead to stiff equations of motion because of high contact stiffn...

Contact interaction is a central problem in many virtual reality and physically based simulations. An approach for simulation of contact interaction between two arbitrary polyhedrons is presented in this paper. This approach treats nondeformable 3D objects with small overlaps at the contact. The presented approach consists of two parts: a collision...