Abstract
In order to create control moments for the rocket, the design of modern solid propellant rocket engines uses swivel control nozzles with elastic support joint. The disadvantage of such a joint as the nozzle suspension is the high joint torque, which determines the high requirements for power and effort of steering actuators. In order to reduce these requirements, it is possible to use the design of a swivel control nozzle with a double elastic joint, known as a nozzle with double elastic seal. This nozzle is not used due to its design and operational complexity, particularly due to its tendency to oscillatory processes, as it is a dynamic system with two degrees of freedom. In the article numerical simulation of dynamics of transient modes at deviations on demanded angles of a swivel control nozzle with double elastic joint is considered. For this purpose the approximate nonlinear mathematical model of dynamics of this nozzle constructed by the Lagrange method is used. The results of numerical simulation of transients in the open loop channel of nozzle movement control at abruptly apply the constant effort of steering actuator are given. It is given the method of determination the values of rotation angles of the moving parts of a nozzle and the effort of a steering actuators corresponding to the required angle of rotation of the nozzle. For the given values of the design characteristics of the nozzle and the layout parameters of the nozzle-steering actuators system by numerical simulation it is established that an acceptable oscillation of transients for the nozzle with a double elastic joint can be achieved by increasing the viscosity resistance coefficients in its suspension. Significant influence on damping of oscillations in transient modes of dynamics of the swivel control nozzle of its damping joint moments is also shown.
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