Investigation of the effect of elimination of component ratio control system on dynamics and accuracy of operation of side units fuel consumption control system in side blocks of the launch vehicle “Soyuz-2”

The article presents the results of the study of the effect of accounting on the nonlinearity of the characteristics of the throttles of the side blocks of the launch vehicle “Soyuz-2” on dynamic and accurate characteristics of fuel consumption control system operation. When the component ratio control system (RCS) is excluded from the fuel composition control system of side units, the accuracy of implementation of control commands calculated in the LSC algorithm begins to be influenced by technological scattering of angular speed of rotation of various samples of throttles of side units, non-linearity and technological spread of characteristics of the throttles, which determine the dependence of pressure drop values on throttle on the throttle angle, etc. In order to assess the consequences of exclusion of the RCS system from the fuel consumption control system of the side units, an analytical dependence was selected for approximation of the throttle characteristic and its parameters were calculated, the simulation model of the control object was adjusted to take into account additional disturbances factors, simulation models of the side block engine control algorithm were formed and investigated (using PC simulation) and recommendations were made on using of variant of algorithm that provides the most advanced dynamic and accurate characteristics the fuel consumption control system of the side block operation.