Theoretical study into efficiency of the improved longitudinal profile of frogs at railroad switches
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 4, Issue 1
Abstract
<p>We have developed a comprehensive method to prolong the time of operation of frogs at railroad switches, based on the consideration of a longitudinal profile of the frog, the magnitude of dynamic forces and normal stresses.</p><p>We have improved a longitudinal profile of the frog, brand 1/11, project 1740, by the method of surfacing under field operation conditions. The slopes of a trajectory after the passage of an average statistical wheel over the proposed profile amount to 3.7 ‰ instead of 10 ‰ for a standard profile of the frog.</p><p>It was established that increasing a load on the frog to 60 % at the expense of a deflection under the frog beam leads to the accelerated disarrangement of the frog, as a result of fatigue defects at the rolling surface, while the cost of frog operation in this case increases by five times.</p><p>We modeled a dynamic interaction between the rolling stock and a standard, as well as the proposed, longitudinal profiles of frogs. Calculation of dynamic processes of the nonlinear interaction between the rolling stock and a standard profile of the frog and the profile restored by surfacing, showed that the magnitude of forces for the proposed frog at the motion speed of 150 km/h is 50 % lower compared with a standard longitudinal profile. At linear simulation of dynamic additions of forces, the magnitude of forces decreases for the proposed profile to 30 %.</p><p>We employed a graphical method to calculate the magnitudes of axial inertia moments and the moments of resistance in the characteristic cross sections of the frog. The estimation of the stressed-strained state of the frog was performed using equations of five moments for a continuous beam on elastic point supports. It was established that stresses at the static calculation of the frog are low and are much less than the maximum permissible magnitude of stresses for a given grade of steel. Therefore, we can argue that the frog works under a load at the expense of existing reserve of strength.</p>
Authors and Affiliations
Vitalii Kovalchuk, Mykola Sysyn, Julia Sobolevska, Olga Nabochenko, Bogdan Parneta, Andriy Pentsak
Keywords
Related Articles
- EP ID EP528047
- DOI 10.15587/1729-4061.2018.139502
- Views 69
- Downloads 0
Development of a method for structural optimization of a neural network based on the criterion of resource utilization efficiency
<p>At present, mathematical models in the form of artificial neural networks (ANNs) are widely used to solve problems on approximation. Application of this technology involves a two-stage approach that implies determinin...
Development of a technology of vitaminized blended vegetable oils and their identification by the fatty acid and vitamin contents
<p class="a">Due to the comparative analyses of physicochemical properties and fatty acid composition of vegetable oils, a reasonable choice has been made. Namely, sunflower, pumpkin, flaxseed, and camelina oils have bee...
Determining the parameters for connections among the elements of design of vehicles in terms of ergonomics and crew safety
<p>This paper reports a study into the working processes of the system «operator ‒ machine ‒ external environment» in land vehicles using the constructed mathematical model.</p><p>A significant effect has been determined...
Development of a method for fraud detection in heterogeneous data during installation of mobile applications
<p>A method for fraud detection when installing mobile applications was proposed. The developed method, in contrast to existing ones, uses all available data regardless of their types, dimensions, and discrepancies and c...
Establishment of fire protective effectiveness of reed treated with an impregnating solution and coatings
<p>An analysis of techniques for determining the fire protective effectiveness of reed was performed; the need to develop reliable methods for studying the process of ignition and flame propagation around the surface of...