Bio: A Wróbel is an academic researcher from Silesian University of Technology. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.
••01 Nov 2016
TL;DR: In this paper, the authors present a part of a research project that aims to develop a technology of freight wagons modernization during their periodic repair, which can solve the problem of corrosion of the wagon's body shell.
Abstract: Rail transport is a very important part of the modern economy, one of the components determining its dynamic development. It is therefore important to conduct research and taking action aimed at the development and refinement of this branch of industry. Such actions directly translate into an increase in its effectiveness, safety, reduction of burden on the environment and society. Nowadays numerous studies are conducted, aimed at introducing new technologies and solutions, both in terms of railway infrastructure and logistics management systems, as well as in traction vehicles themselves. Introduction of modern technology helps eliminate or reduce nuisance problems associated with the implementation of any kind of transport or the operation of the used technical means. Presented paper concerns an issue of freight wagon modernization using composite materials. It presents a part of a research project that aim is to develop a technology of freight wagons modernization during their periodic repair. The main problem during exploitation of concerned types of freight wagons designed for coal transport is corrosion of the wagon's body shell. The goal of the project is to elongate the period between periodic repairs (by better corrosion protection) and improve conditions of exploitation of modernized freight wagons (for example easier unloading during winter conditions - no freezes of the charge to the freight wagon body shell). One of elements of the project is also to develop a system for diagnosing the technical condition of the modernized shell of wagon body during operation. For this purpose the use of non-destructive testing methods of technical state of constructions will be used, including methods that use the analysis of dynamic response of the object. Application of the composite panels to the freight wagon's body shell was proposed as the solution that can solve mentioned problems during exploitation of freight wagons. The composite panels composed of fiberglass and epoxy resin were proposed. They will be mounted on the body shell using blind rivet nuts. What is more the body shell of the modernized freight wagon will be painted using an anticorrosion agent. The research project is realized by a consortium composed by research units and industry and supported by the Polish National Centre for Research and Development.
TL;DR: In this paper, the authors developed a model of strength of a loadbearing bodywork of a covered wagon made from round tubes when transported by a railroad ferry, and determined a design service life of the node for fastening chain screeds at the body of the covered wagon.
Abstract: Improving the efficiency of transportation process through international transport corridors promotes the development of interoperable systems. Successful functioning of the interoperability of transportation is possible at reliable and well-coordinated work of individual components. In this regard, it is necessary to introduce into service a new generation of rolling stock with improved techno-economic and performance indicators. We have designed a supporting structure of the covered wagon, whose special feature is that the elements of the body are made of round tubes; in order to ensure the reliability of its fastening to the deck of a rail ferry, the nodes for fastening chain couplers are arranged at the pivot beams. To refine the determination of indicators for the strength of the body of a covered wagon, we have investigated its dynamic loading under the most unfavorable estimation scheme ‒ angular displacements of the railroad ferry relative to its longitudinal axis (equivalent to lateral pitching oscillations in the dynamics of railroad cars). We have determined the maximum magnitude of accelerations using mathematical modeling of a railroad ferry oscillations with wagons placed on its decks, applying a second-order Lagrange method. Solving differential equations of a railroad ferry oscillations, with railroad cars on it, employed the Runge-Kutta method in the programming environment MathCad. When determining the total magnitude of acceleration acting on the body of a covered wagon when transported by a railroad ferry, we also accounted for the horizontal component of a free fall acceleration, predetermined by the tilt angle (heeling) of the railroad ferry. The resulting value for acceleration as a component of dynamic loading was taken into account while studying the strength of a load-bearing bodywork of the covered wagon. The calculation employed a finite element method in the programming environment CosmosWorks. To this end, we developed a model of strength of a load-bearing bodywork of the covered wagon made from round tubes when transported by a railroad ferry. It has been established that the maximum equivalent stresses do not exceed those permissible for the grade of steel used for metallic structures of the body and are about 280 MPa. We have determined a design service life of the node for fastening chain screeds at the body of a covered wagon when transported by a railroad ferry. Results of this research could be applied when designing railroad cars of the new generation with improved technoeconomic and performance indicators
01 Jan 2004
TL;DR: In this paper, the lateral characteristics of the link suspension of two-axle freight wagons were analyzed using a simulation mathematical model, and the influence of various parameters on the link characteristics was investigated.
Abstract: Abstract Link suspension is the most prevailing suspension system for two-axle freight wagons and still frequently used for four-axle freight wagons in central and western Europe. The system design is simple and has existed for more than 100 years. However, still, the characteristics are not fully understood. This article focuses on the lateral characteristics of the link suspension. First, results from stationary measurements on freight wagons and laboratory tests on single links are presented. Then, a simulation mathematical model is proposed. Finally, the influence of various parameters on the link characteristics is investigated. With the developed simulation model, many of the stability problems of link suspension running gears can be explained, but further research is needed to fully understand the characteristics and to be able to recommend improvements. From the tests, it also becomes obvious that the characteristics of different links can vary significantly from each other depending on age and maintenance status.
TL;DR: In this paper, the use of double walls filled with aluminium foam for an open wagon in order to decrease the dynamic stresses during the operational modes has been investigated and the strength calculation for the bearing structure of the open wagon with consideration of the engineering solutions proposed.
Abstract: The research is concerned with the use of double walls filled with aluminium foam for an open wagon in order to decrease the dynamic stresses during the operational modes. The research presents the strength calculation for the bearing structure of an open wagon with consideration of the engineering solutions proposed. It was found that the maximum equivalent stresses appeared in the bottom section of the centre sill behind the back support; they amounted to about 315 MPa and did not exceed the allowable values. The maximum displacements were detected in the middle section of the centre sill and amounted to 9.6 mm. The maximum deformations were 1.17 × 10−2. The research also presents the strength calculation for a weld joint in the maximum loaded zones of the bearing structure of an open wagon and gives the results of a modal analysis of the bearing structure of the improved open wagon. It was found that the critical oscillation frequencies did not exceed the allowable values. The results of the research may be useful for those who are concerned about designing innovative rolling stock units and improving the operational efficiency of railway transport.
••01 Jan 2017
TL;DR: In this paper, a process of modelling in a CAD system and designing of arrangement of composite panels used for freight cars' body shell protection against corrosion and for easier unloading of transported cargo in winter conditions is presented.
Abstract: A process of modelling in a CAD system and designing of arrangement of composite panels used for freight cars’ body shell protection against corrosion and for easier unloading of transported cargo in winter conditions is presented in this work. Arrangement of used composite panels was designing in order to fulfil assumed criteria and thus to improve the process of freight cars modernization during periodic repairs.
01 May 2020
TL;DR: The engineering solution made it possible to decrease the tare weight of a hopper car in comparison with that of a prototype by 5%, thus enhancing higher efficiency of rail transportation.
Abstract: Higher operational efficiency of hopper cars can be achieved with the flash-concept for a resourcesaving structure. The characteristic feature such cars is the use of circular pipes as the carrying body elements. The engineering solution made it possible to decrease the tare weight of a hopper car in comparison with that of a prototype by 5%. A 20-9749 hopper car, manufactured by Panutinskiy Car Repair Plant (Ukraine), was taken as a prototype. On the basis of the suggested hopper car, an articulated car was designed. The dynamic loading of the articulated hopper car was defined with mathematical modelling. The study was conducted in plane coordinates. The acceleration values obtained were considered in the strength calculation for the carrying structure of the hopper car. The strength factors were defined in COSMOSWorks software environment. It was determined that the maximum equivalent stresses in elements of the carrying structure did not exceed the admissible values. The results of the research will promote designing innovative hopper cars for transporting hot pellets and agglomerate, thus enhancing higher efficiency of rail transportation.