Calculation of solid-state cargo fastener under the influence of longitudinal forces

Abstract

Cargo securing on a railway platform, elastic and retention fasteners, longitudinal transport force of inertia, forces in elastic fastenings. Purpose: The paper presents the calculation of the longitudinal transport force of inertia; determines the longitudinal force perceived by the elastic elements of the cargo securing; determines the reactions of retention bars depending on the number of bars and fasteners (nail); calculates the sum of all holding forces; calculates the forces in the elastic fasteners when exposed to longitudinal forces. Research methods: To determine the forces in the cargo securing devices, existing calculation methods are used. Moreover, the formulas of these techniques are presented in a form convenient for calculation. Main results: The paper proves that according to the existing method, the force in all elastic cargo fasteners under the influence of longitudinal forces has the same value, regardless of the different arrangement of the geometric parameters of the fasteners in space. The forces in them are more than 1.6 times higher than the permissible values. The calculations of forces in the elastic fasteners, which are performed by the specified method, are given. The results of the comparative analysis showed that the forces in all wire fasteners, in contrast to the existing calculation method, have different values. However, the strength of the second pair of wire fasteners of both one and the other direction is not ensured - the force in them more than two times exceeds the permissible value (61/24.8≈2.5), which will result in their destruction during the cargo transportation. Conclusions and their significance for the industry: Existing calculation methods do not provide guarantee strength of cargo fasteners. In the future, to calculate the fastening of cargo by shippers in the railway industry, a new calculation procedure should be applied for the allocation and fastening of cargo on the car.

Incorrectness of the method of calculating cargo fastening on railway platforms

“…The results of the calculations of forces in flexible elements of cargo fastening on a railway platform are presented below (see fig. 1 in [24]).…”

“…view Infig. 1, 1 -4, 1a -4a; 1p -4p, 1ap -4ap -numbers of elastic fasteners of one or the other direction[24].…”

The sorting Hump is a “drawing-analytical” method in finding the coordinates of the elements of the Strait

“…In the traditional method, finding the tangent T value based on the angles Y and radius R values was done using the formulas given in [18,19,20]. In this method we find the arc of the designed angle height, its radius R at values of 200, 250, 300 and greater that the urination state occurs munkin.…”

Strength assessment of the body of a weight checking wagon type 640-VPV

“…The longitudinal force of inertia of the body and bogies of the weighing wagon was determined by multiplying the mass of the body of the weighing wagon by the normalized value of the longitudinal acceleration [18]. The longitudinal force of inertia of the load N и was determined by the formula…”