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Simulation evaluation of the influence of selected geometric parameters on the operation of the pneumatic braking system of a trailer with a differential valve

Szpica Dariusz, Kisiel Marcin, Czaban Jarosław

Acta Mechanica et Automatica

2022

Vol. 16, no. 3

233--241

This article presents simulation models of trailer air brake systems in configurations without a valve and with a differential valve, thus demonstrating the rationale for using a valve to improve system performance. Simplified mathematical models using the lumped method for systems without and with a differential valve are presented. The proposed valve can have two states of operation depending on the configuration of relevant parameters. These parameters can include the length of the control pipe, the throughput between chambers in the control part of the valve and the forcing rise time. Based on the calculations, it was found that the differential valve with large control pipe lengths can reduce the response time of the actuator by 42.77% relative to the system without the valve. In the case of transition of the valve to the tracking action, this time increases only by 9.93%. A force rise time of 0.5 s causes the transition of the valve from the accelerating action to the tracking action, with 9.23% delay relative to the system without a valve. The calculations can be used in the preliminary assessment of the speed of operation of pneumatic braking systems and in the formulation of guidelines for the construction of a prototypical differential valve. In conclusion, it is suggested to use a mechatronic system enabling smooth adjustment of the flow rate between chambers of the control system of the differential valve.

Koncepcja metody zabezpieczenia pomp odśrodkowych przed skutkami zjawiska uderzenia hydraulicznego – wyniki badań laboratoryjnych

Choma A., Kowalski D.

Rocznik Ochrona Środowiska

2016

Tom 18, cz. 2

134--145

The following papper discusses the issues related to the occurrence of water Hammer phenomenon in pressure liquid transportation systems. Although the knowledge about the problem of water Hammer phenomenon Has been developer over 100 years continues to demonstrate that the systems inadequately protected against the effects of impact of water hammer are exposed to numerous accidents and various maintenance problems. The devices that particularly vulnerable to the formation of water hammer phenomenon are centrifugal pumps. The article presents an original concept of centrifugal pumps security methods based on the differential valve of their own construction and the results of laboratory tests the effectiveness of the method.