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Simulation of thermomechanical processes in disc brakes of wheeled vehicles

Hrevtsev O., Selivanova N., Popovych P., Poberezhny L., Sakhno V., Shevchuk O., Poberezhna L., Murovanyi I., Hrytsanchuk A., Romanyshyn O.

Journal of Achievements in Materials and Manufacturing Engineering

2021

Vol. 104, nr 1

11--20

Purpose: Ensuring the required operational reliability of disc brakes by forecasting their technical condition taking into account thermomechanical processes. Design/methodology/approach: Differential equations of rotation of a rigid body around a fixed axis are solved, it is established that the equations of motion and the equations of thermal conductivity are indirectly related. The use of these analytical dependences provides a better understanding of thermomechanical transients. Findings: The solution is obtained on the basis of the differential equation of thermal conductivity of the hyperbolic type, which does not allow an infinite velocity of propagation of temperature perturbations in contrast to the differential equation of thermal conductivity of the parabolic Fourier type. The obtained analytical dependences provide a better understanding of thermomechanical transients and develop a theoretical basis for determining stresses and heat fluxes in solving problems of reliability and durability of disc brakes. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Practical implications: It is shown, that transients in a mechanical system - a brake disk at impulse loadings cause emergence of thermal effects which arise under the influence of external loadings. Originality/value: The application of these analytical dependences provides a better understanding of thermomechanical transients and develops a theoretical basis for solving problems of reliability and durability of disc brakes.

Informational essence of flicker-noise

Stadnyk B, Kolodiy Z., Depko P.

Pomiary Automatyka Kontrola

2006

R. 52, nr 12

50-52

It was presented the computer simulation results of chaotic motion. They showed that flicker-constituent noises were contained the information about explored system features of internal structure. The criterion for estimation the change of mentioned structure by means of flicker-noises was offered.

Podano wyniki komputerowego modelowania chaotycznego ruchu, które pokazują, że fliker-składowa szumu zawiera informację o osobliwościach wewnętrznej struktury badanego systemu. Zaproponowano kryteria oceny zmiany wewnętrznej struktury na podstawi fliker-szumów.