Research
Analytical Investigation of Wagon Speed and Traversed Distance during Wagon Hump Rolling Under the Impact of Gravity Forces and Head Wind
The article gives an account of the results of construction of mathematical modeling of the wagon rolling down the hump under the impact of gravity and head wind aerodynamic drag forces that made it possible to derive analytical formulas for determining wagon speed and traversed distance during rolling down the first profile hump section. The results of the analytical research of dynamics of wagon rolling down the first high-speed hump section can be used for all the rest hump sections taking into account the specifics of braking forces on these sections. The novelty of the derived formulas of wagon speed rolling down high-speed hump section is in presenting head wind aerodynamic drag force as depending on the wagon speed rolling down hump profile and speed and direction of air flow with proper allowance for resistance forces arising during wagon movement.
Analytical Investigation of Cargo Motion Lengthwise the Wagon under the Action of Plane Force System
For the first time in the theory of solid cargo fastening there has been investigated a case when the cargo is in motion in relation to the wagon floor with acceleration r a , its speed being at this moment equal to r v . There have been set out the results of analytical investigation of cargo shift in dynamics and accordingly elongation and tension in flexible fastening elements under the action of plane force system. It has been established that the longitudinal force perceived by the flexible fastening elements in value is smaller than the force obtained when inertia in relative motion (at rest) is not taken into account. Hence, the cargo shift lengthwise the wagon in this case will be smaller. This, in its turn, will affect the decrease of elongation value and consequently the decrease of the effort of every flexible element, thus increasing their load-carrying capacity.
