Abstract
The article presents the results of the development of diagnostic models of automation elements of liquid-propellant rocket engine power systems. A functional model of a pneumatic valve has been developed, which provides that it is subjected to mechanical action from moving elements, and oscillations in the form of vibration and acoustic waves are observed at the output. The paper presents the results of studies of the dynamics of the mechanical system, which is represented by the valve under study, a mathematical model of the valve closing process, which is a reliable display of the valve's operating characteristics, which it reproduces. The model 
 describes the relationship of the equation of the dynamics of the moving parts of the valve and the occurrence of forced vibrations in its structure and associated elements
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