Nikolay Lysikov

• Bryansk State Technical University

Approaches and methods for applying mathematical models implemented in software package "Universal Mechanism" for assessing the behavior of the drill string including modern systems for supporting the construction of wells for oil and gas production are considered.

Models of bit–rock interaction forces in computer–aided simulation of drillstring dynamics are considered in the paper. The torque on bit (TOB) model with sticking and sliding modes is described in details and can be used for analysis of self–excited stick–slip oscillations of drillstring. Stationary models can be used in the dynamic model of TOB,...

The selection of optimal operational parameters for drilling oil and gas wells is a complex dynamic problem that depends on multiple parameters. Numerous physical and mechanical processes such as rock cutting, friction, hydraulics, and different modes of vibrations, occur during drilling, which should be accounted for in numerical models. It is wid...

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...

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...