Search

The bogies of railway cars are important components of the rolling stock system. The test stand solution that we have developed and proposed is used for testing car bogies under load to inspect and highlight the features that ensure operational safety and energy efficiency. This article presents the development and manufacturing of a prototype test stand for railcar bogies, incorporating specific elements such as hydraulic pressure cylinders, force transducers, displacement transducers, a hydraulic pumping system, a data computation and processing system, as well as a control and command unit. The technical topic of developing the test stand is aimed at testing bogies under a controlled, variable and uniformly distributed load, closely simulating the operational conditions of railcar bogies. The accurate and complete determination of the bogie's parameters assures the railroad operator that they are safely interchangeable—Moreover, decreasing the time spent on testing tasks and increasing the testing process efficiency through process automation is leading to a cutback in energy consumption and better predictability of the time intervals required for the repair of railway cars. The prototype consists of three hydraulic pressure cylinders: a centrally located hydraulic cylinder exerting a maximum pressing force of 20 tons-force and two lateral hydraulic cylinders, each applying a maximum pressing force of 10 tons-force. The hydraulic cylinders operate independently from each other, also supporting asymmetric load distributions that recreate the operating conditions as faithfully as possible. The data processing system monitors the magnitudes of the forces and the displacement of the hydraulic cylinders for reporting the specific characteristics of the bogie. To ensure rapid response in the control of the testing process, a control logic unit was developed, entirely dedicated to the control of this technological process. The graphical user interface of the embedded computer system was designed in the LabVIEW programming environment. [ABSTRACT FROM AUTHOR]

Energy efficiency is a priority objective of the research strategy. Particularly, the energy efficiency of the drillingextraction equipment is an issue of high relevance, the decreasing of energy consumption in crude oil extraction being among the objectives of the research strategy in the oilfield equipment. The paper presents a constructive version for a representative high power drawworks part of an oil and gas drilling rig, with recuperative braking, powered by two asynchronous electric motors. By implementing this concept it is estimated that a significant part of domestic hot water consumption at rig location as well as the heating of the radiators belonging to the drilling rig barracks is recovered by the thermal energy produced by the drawworks braking system. The power saving is about 100 kW by recovering thermal energy produced by the two asynchronous electric motors of the high power drawworks. [ABSTRACT FROM AUTHOR]