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This article outlines the main provisions of the program, methodology, description of the object of experimental studies and construction of a physical model of the jib crane rotation mechanism. A real QTZ 80 crane has been chosen for the study, which differs from the laboratory installation (physical model) of the jib crane rotation mechanism by structural, power and energy parameters, for this reason, experimental studies used physical modeling, which usually changes the scale and leaves the physical nature of phenomena. Therefore, similarity theory is used to determine the characteristics of the physical model. A physical model (laboratory unit) of the jib crane rotation mechanism was designed to conduct experimental studies on the similarity theory. This model is prepared for experimental studies of the dynamics of the rotation mechanism during the start-up process. To determine the similarity criteria, equations of motion were used that reflect the operation of the jib crane rotation mechanism, namely the three-mass dynamic model of the rotation mechanism, which is a system of three second-order differential equations. Using the obtained ratios of similarity criteria, the numerical values of the similarity coefficients of the real rotation mechanism of the jib crane and its physical model are determined. Based on the parameters obtained, a physical model of a full-scale jib crane rotation mechanism was constructed. The results obtained in this study can be further used to refine and improve existing engineering methods for calculating the mechanisms of rotation of cranes, both at the stages of their design/construction, and in real operation.

; доктор техшчних наук; зав1дувач кафедри конструювання машин i обладнання; Нацiональний унiверситет бюресуршв i природо користування Украши; навчальний корпус №11, вул. Геро!в Оборони,

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