Modeling of Operation of Elastic-frictional Draft Gear by NX Motion Software

The use of nonlinear dynamic analysis in the calculation of cargo fall onto the hatch of the gondola car

“…Next, we consider the regulated [1,2] case of falling of lump cargo weighing 150 kg from 3 m height onto the closed cover. In the previously mentioned sources [13][14][15][16], the loading of the cover (when the cargo falls on it) is estimated using the coefficient of dynamism, which is determined by the formula derived from the equation of the potential energy of the cargo, existing at the height h 0 above a vertically standing weightless rod, and the maximum potential energy of elastic deformations of this rod, which arise when the cargo is falling.…”

“…It should be noted that during the tests the falling of cargo on the cover happens at the moment when the cover is a part of the railcar, which elements also perceive kinetic energy of the falling cargo; in addition, to avoid local surface deformations of the cover, a layer of sand is poured onto the cover, the sand also absorbs a part of energy and redistributes the force of interaction between the cargo and the cover on the larger area. In order for the research-engineers to unambiguously interpret the conditions for which the calculation of the impact interaction is performed, the normative documents [1] and [2] must be supplemented. Otherwise, research-engineers will obtain the results that differ enormously.…”

“…In the normative documents [1][2], in accordance with which the freight cars and their assemblies must be designed, there are points according to which it is required to verify the hatch covers of gondola cars in terms of strength under the following conditions: -when the hatch cover falls on the stops when the gondola car is being unloaded, -when a lump cargo weighing 2000 kg falls from 3 m height onto the closed cover (when the mass of separate pieces is not exceeding 100 kg), -when the cargo weighing 150 kg falls from 3 m height onto the center of the closed cover.…”

“…Compliance of covers of hatches with these requirements is traditionally checked by experimental methods or a report is drawn in which a picture with stresses' distribution from the static loading is presented, the value of which does not cause stresses exceeding the allowable values, which corresponds to the formal requirements of normative documents [1][2].…”

Temperature effects on railway rolling stock components

“…The study of the dynamics of cars on the promising designs of carts is carried out in the publication [48]. The results of the calculation proved the feasibility of using these models of carts under freight cars.…”