Модель динаміки розімкненої системи автоматичного керування військового призначення

Formulation of the problem in general. The purpose of the article is to develop a model of the dynamics of an open-loop automatic control system for military purposes based on throttle-controlled hydraulic drives. Research methods. The following methods were used in the study: content analysis - to analyse and evaluate the effectiveness of mobile fire groups; system analysis - to form the scientific and methodological approach proposed in the article; mathematical modelling methods - to determine the relationship between the duration of the control signal and the movement of the actuator stem. Literature review. The analysed works are aimed at considering the processes of levelling the platform in the horizontal plane and automatically maintaining it in this position, optimising the time of transient processes. However, compensation for external impact from a firearm is not considered in open sources. Research results. A model of the dynamics of an open-loop automatic control system has been created, which makes it possible to determine the amount of corrective influence to increase the efficiency of using atypical firearms installed on a high-speed vehicle. Research novelty. The scientific novelty of the obtained results is that the synthesised model of the automatic control system (open-loop, without feedback) takes into account not only the features of the actuator (with a limitation) but also the nonlinear characteristics of the hydraulic system (fluid compression ratio, inertial properties, and payload mass). All this brings the model closer to the characteristics of the real system. Theoretical and practical significance. The use of hydraulic actuators with discrete distributors (despite their lower cost and high performance) is limited for a number of reasons (small number of working positions of the rod, low operating speed, lack of the ability to program the position of the working body). Removing (levelling) these limitations will improve the characteristics of hydraulic actuators and expand their scope of use. The results obtained are of particular value for the military and defence sector in the development of a stabilisation system for atypical firearms installed on a highly mobile transport base. Conclusions and future work. The paper substantiates the choice of the type of actuator and presents the basic mathematical equations for creating a model of the dynamics of an open-loop automatic control system for military purposes. The method of calculation and design of open hydraulic actuators is presented. Throttle-controlled actuators are considered. The issues of dynamic analysis and synthesis are reflected. Further research can be aimed at experimental verification of the model and development of adaptive control algorithms.