| Summary: | Problem. When studying the work processes that occur in pneumatic or electropneumatic circuit
of brake systems or pneumatic suspension systems of a wheeled vehicle, researchers use various
expenditure functions on the basis of which they draw scientific conclusions and obtain scientific results,
while they do not think about the fact that the functions are credible or not. The choice of the expenditure
function, for researchers, is an actual scientific task, which should have a scientific justification and should
not have a formalized nature. Goal. The aim of the study is to compare the expenditure functions to
determine the nature of their influence on the dynamic processes that occur during filling or emptying
links of the pneumatic circuit. Methodology. The approaches adopted in the work to solving the set goal
are based on the analysis of the results of simulation modeling of work processes in pneumatic circuit.
Results. A comparison of the research results obtained in this work with each other and with the results
obtained in experimental studies, allowed us to establish the peculiarities of the course of work processes
in the pneumatic circuit links when using different expenditure functions. It was established that,
depending on the choice of the expenditure function, with the same initial conditions of simulation
modeling, the results of the study can differ by up to 40%. Originality. The use of a universal basis of
simulation modeling, based on various expenditure functions, enabled to establish that it is possible to
propose new functions that better describe the working process in a pneumatic circuit than the known
ones. Practical value. The obtained results can be recommended in the practice of simulation modeling of
work processes in pneumatic or electropneumatic circuits of brake systems and systems of pneumatic
suspension of wheeled vehicles.
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