Research into the Strength of an Open Wagon with Double Sidewalls Filled with Aluminium Foam

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This paper reports the improved load-bearing structure of a hopper car for transporting pellets and hot sinter. In order to increase the strength of the load-bearing structure of a hopper car under the influence of high temperatures from the transported cargo, the use of cladding made of composite material has been proposed. This solution also contributes to a 5 % reduction in the wagon's tare compared to the prototype car. The dynamic load on the load-bearing structure of a hopper car was determined. This study was carried out for the case where an empty wagon was moving over an irregularity between the rail joints. The calculations showed that the studied dynamics indicators did not exceed the permissible values. At the same time, the ride of a hopper car is rated as "excellent". The main indicators of the strength of the carrying structure of a hopper car were determined taking into consideration the proposed improvement. That took into account the temperature effect exerted on the load-bearing structure of a hopper car by hot sinter. It was established that the maximum equivalent stresses occur in the zone of interaction of the girder beam with the pivot beam and are about 290 MPa. At the same time, stresses in the cladding of a hopper car are about 200 MPa, which is 12 % lower than those in a regular structure. Modal analysis was carried out to determine the frequencies and shapes of the natural oscillations of the bearing structure of a hopper car with a composite cladding. The calculation results demonstrated that the first natural frequency exceeds 8 Hz. Therefore, the safety of the wagon is provided. The coefficient of fatigue resistance of the load-bearing structure of a hopper car was calculated. It was established that its value is almost twice as high as the permissible one. That is, the resistance to fatigue of the supporting structure is provided. The research reported here could contribute to ensuring the strength of the load-bearing structures of hopper cars, reducing the cost of maintenance, and increasing the efficiency of their operation.

Section: The Study Materials and Methodsmentioning

confidence: 99%

Determining the features of temperature influence on the load-bearing structure of a hopper car with a composite cladding when transporting pellets to metallurgical enterprises

Fomin

Lovska

DZHENCHAKO

et al. 2022

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“…In [15], to reduce the dynamic load on the gondola car, the authors proposed the use of energy-absorbing material in its design. Calculations were performed on the example of the use of aluminum foam.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Our review of literary sources [6][7][8][9][10][11][12][13][14][15] makes it possible to conclude that the issues of improving vehicles to reduce their tare, as well as dynamic load, require further research and development in order to increase the efficiency of operation of the transportation industry.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Justifying the expediency of using composite components in the long-wheelbase platform car

Fomin¹,

Lovska

Fomina

et al. 2022

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This paper reports the improved load-bearing design of a long-wheelbase platform car for the transportation of containers. The improvement involves the construction of a special structure to accommodate fitting stops made from composite material. The design of the add-on structures provides an opportunity to reduce dynamic loads between containers and the platform car at the expense of elastic friction bonds. The dynamic load on the bearing structure of the platform car was determined. To this end, a mathematical model was built that takes into consideration its movement in the vertical plane. The results of resolving the mathematical problem established that the derived values of accelerations were 5.3 % and 6.2 %, respectively, lower than those acting on the platform car and container, taking into consideration the typical scheme of their interaction. To ensure the strength of the add-on structure, the calculation was performed using a finite-element method. It was established that the maximum stresses occurred in the inclined parts of the add-on structure and were 113.6 MPa, which is much lower than the permissible ones. In addition, within the framework of this study, a dynamic load on the improved design of the platform car was determined when it moves empty. The calculation results showed that the defined indicators of dynamics were within the permissible limits while the ride of the platform car was "good". The coefficient of resistance to fatigue of the load-bearing structure of the platform car was determined, taking into consideration the new scheme of interaction with containers. Taking the proposed solutions into account, it becomes possible to increase the resistance coefficient of fatigue of the load-bearing structure of the platform car by 8 % compared to the typical scheme. The study reported here could help reduce the cost of maintaining combined transport vehicles, as well as improve the efficiency of their operation.

“…The authors of [14,15] make improvements to the load-bearing structures of freight cars to reduce their dynamic load under operational modes. The set goal is achieved by using a material with energy-absorbing properties for the load-bearing structures of freight cars containing round cross-section pipes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The above review of literary sources [9][10][11][12][13][14][15][16][17][18] allows us to conclude that the issue related to reducing the load on the bearing structure of a covered freight car under operational load modes requires further research and development.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Defining patterns in the dynamic load and strength of the bearing structure of a covered freight car with a filler in the girder beam

Panchenko

Fomin

Vatulia

et al. 2021

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This paper reports a study into determining the dynamic load and strength of the bearing structure of a covered freight car under operational modes. A feature of the freight car's bearing structure is that the girder beam has a closed cross-section. To reduce the dynamic load of the frame, the girder beam is filled with a material with viscoelastic properties. Such a solution could contribute to the transformation of the kinetic energy of impact (due to jerk, stretching, compression) into work of viscoelastic friction forces, and, consequently, to reducing the load on the bearing structure. To substantiate the proposed improvement, the dynamic load on the bearing structure of a covered freight car was mathematically modeled. The calculation was performed for the case of joint impacts at shunting. The study was carried out in a flat coordinate system. It was established that the maximum accelerations acting on the bearing structure of a covered freight car were about 37 m/s2. The calculated acceleration value is 3.2 % lower than that obtained for the bearing structure of a covered freight car without filler. The results of calculating the strength of the load-bearing structure of a covered freight car are given. In this case, a finite-element method was applied. The maximum equivalent stresses occur in the zones of interaction between the girder beam and the pivot beams, and amount to 319.5 MPa, which is 8 % lower than permissible. The calculation was also performed regarding other operational modes of loading the freight car's bearing structure. The model of the dynamic load on the bearing structure of a covered freight car was verified according to the F-criterion. The research reported here could contribute to designing innovative rolling stock structures, thereby improving the efficiency of their operation.