scholarly journals Increasing the efficiency of an interceptor system for rocket engine thrust vector control

2020 ◽  
Vol 2020 (4) ◽  
pp. 13-28
Author(s):  
H.O. Strelnykov ◽  
◽  
O.L. Tokareva ◽  
O.D. Ihnatiev ◽  
N.S. Pryadko ◽  
...  
Keyword(s):  
Supersonic Flow ◽  
Vector Control ◽  
Rocket Engine ◽  
Control Force ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Gas Dynamic ◽  
Working Medium ◽  
Combined Control ◽  
Thrust Vector

This work is concerned with studying the static and dynamic characteristics of the gas-dynamic (interceptor) subsystem of a combined system for thrust vector control and identifying ways to increase its efficiency. The combined control system includes a mechanical and a gas-dynamic subsystem. The gas-dynamic thrust vector control subsystem is the most important and reliable part of the combined control system. Consideration is given to disturbing the supersonic flow by installing a solid obstacle (interceptor) in the middle part of the rocket engine nozzle. An important advantage of this method to gas-dynamically control the rocket engine thrust vector is that the thrust vector control loss of the specific impulse is nearly absent because the control force is produced without any consumption of the working medium. Injection through the interceptor protects it against exposure to the nozzle supersonic flow and produces an additional lateral force. By now, the optimum height of the mass supply opening in the interceptor that maximizes the control force has not been determined, and the dynamic characteristics of this system have not been studied. The aim of this work is to find the optimum position of the opening for working medium supply through the interceptor that maximizes the added control force and to determine the effect of the transfer functions of the interceptor system components on the characteristics of the control force production transient. As a result of the study of the static characteristics of the supersonic flow disturbance in a nozzle with an interceptor through which a secondary working medium is injected, it is concluded that in terms of thrust vector control efficiency and interceptor protection the injection opening should be situated in the upper part of the interceptor. The transfer function of interceptor control of the liquid-propellant rocket engine thrust vector is obtained with account for the production of an additional control force by the injection of a liquid propellant component. It is found that the loss of stability of the operation of an injection interceptor unit depends on the transient of the working medium injection control valve.

scholarly journals Rocket engine thrust vector control by detonation product injection into the supersonic portion of the nozzle

2020 ◽  
Vol 2020 (4) ◽  
pp. 29-34
Author(s):  
S.S. Vasyliv ◽  
◽  
H.O. Strelnykov ◽  
Keyword(s):  
Supersonic Flow ◽  
Vector Control ◽  
Control Systems ◽  
Main Shock ◽  
Rocket Engine ◽  
Lateral Force ◽  
Detonation Products ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Thrust Vector

For solving non-traditional problems of rocket flight control, in particular, for the conditions of impact of a nuclear explosion, non-traditional approaches to the organization of the thrust vector control of a rocket engine are required. Various schemes of gas-dynamic thrust vector control systems that counteract impact actions on the rocket were studied. It was found that the dynamic characteristics of traditional gas-dynamic thrust vector control systems do not allow one to solve the problem of counteracting impact actions on the rocket. Appropriate dynamic characteristics can provide a perturbation of the supersonic flow by injecting into the nozzle the detonation products with the main shock wave propagating in the supersonic flow. This way to perturb the supersonic flow in a rocket engine nozzle is investigated in this paper. In order to identify the principles of producing control forces and provide a perturbation of the supersonic flow by injecting into the nozzle the detonation products with the main shock wave propagating in the supersonic flow, a computer simulation of the nozzle flow was performed. The nozzle of the 11D25 engine developed by Yuzhnoye State Design Office and used in the third stage of the Cyclone-3 launch vehicle was taken as a basis. The thrust vector control scheme relies on the use of the main fuel component detonation. The evolution of the detonation wave in the supersonic flow of the combustion chamber nozzle was simulated numerically. According to the nature of the perturbation propagation in the nozzle, the lateral force from the perturbation has an alternating character with the perturbation stabilization in sign and magnitude when approaching the critical nozzle section. The value of the relative lateral force is sufficient for counteracting large disturbing moments of short duration. Thus, the force factors that can be used to control the rocket engine thrust vector are identified. Further research should focus on finding the optimal location of the detonation product injection in order to prevent mutual compensation of force factors.

scholarly journals Development of a structural schematic of a bifunctional system for rocket engine thrust vector control

2018 ◽  
Vol 2018 (4) ◽  
pp. 57-67 ◽  
Author(s):  
G.A. Strelnykov ◽  
◽  
E.L. Tokareva ◽  
N.S. Pryadko ◽  
A.D. Yhnatev ◽  
...  
Keyword(s):  
Vector Control ◽  
Rocket Engine ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Thrust Vector

scholarly journals Dynamic characteristics of a combined system for rocket engine thrust vector control

2019 ◽  
Vol 2019 (3) ◽  
pp. 16-29
Author(s):  
E.L. Tokareva ◽  
◽  
N.S. Pryadko ◽  
K.V. Ternova ◽  
◽  
...  
Keyword(s):  
Vector Control ◽  
Dynamic Characteristics ◽  
Rocket Engine ◽  
Combined System ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Thrust Vector

scholarly journals An operation algorithm for the combined thrust vector control system of a rocket engine

2019 ◽  
Vol 4 (123) ◽  
pp. 58-66
Author(s):  
Olena Leonidivna Tokareva ◽  
Natalia Serhiivna Priadko ◽  
Ternova Vitaliivna Ternova
Keyword(s):  
Control System ◽  
Vector Control ◽  
Input Signal ◽  
High Frequency ◽  
Rocket Engine ◽  
Vector System ◽  
Thrust Vector Control ◽  
Gas Dynamic ◽  
Thrust Vector ◽  
Vector Control System

The new combined rocket engine (RE) control system consists of combining various control systems - mechanical thrust vector control system (MTVCS) and gas-dynamic one (GDTVCS) within one bifunctional system that performs the functions of controlling and stabilizing the rocket stage flight. Previously it was shown that the MTVCS speed has limit, since with its speed increase the sensitivity to high-frequency random disturbances rises, which increases random errors. In addition, the system performance rise leads to an increase in the mass and dimensions of the steering drive of the engine swing. As part of the combined system, GDTVCS supplies any given speed requirements, and MTVCS provides maximum control efforts with minimum drive power and maximum element simplicity of the thrust vector control system as a whole. However, there is a problem of rational function distribution between subsystems and coordination of their functioning. For automatic control of the RE thrust vector, the input data are angle deviations in a certain plane, which characterize the direction violations of the installation.The purpose of the work is to study the input signal characteristics of the thrust vector system of steering engines applied to the combined RE control system and the design of an optimal algorithm for its operation.There were analyzed possible determining methods for the trend existence of the input signal on the characteristic RE operation intervals and method was proposed for selected trend using. This made it possible to develop an algorithm for the functioning of the combined (mechanical and gas-dynamic) thrust vector control system of the rocket engine. The created algorithm provides the processing of the TVCS input signal with the selection of the deterministic (static) component (trend) and high-frequency signal oscillations (deviations from the trend). The trend type of the deviation angle perturbation of the RE thrust vector is also taken into account. The typical dependence of the output control actions for the steering RE on the input signals at different operation time intervals is investigated.The developed algorithm allows optimal separating (in terms of energy consumption for creating control efforts) the subsystem functions of the combined RE thrust vector control system, to improve the quality and reliability of the flight control system of the rocket stage.

scholarly journals Thrust Vector Control of an Upper-Stage Rocket with Multiple Propellant Slosh Modes

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Jaime Rubio Hervas ◽  
Mahmut Reyhanoglu
Keyword(s):  
Vector Control ◽  
Center Of Mass ◽  
Nonlinear Feedback ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Mass Spring Model ◽  
Upper Stage ◽  
Thrust Vector ◽  
Mass Spring ◽  
Main Engine

The thrust vector control problem for an upper-stage rocket with propellant slosh dynamics is considered. The control inputs are defined by the gimbal deflection angle of a main engine and a pitching moment about the center of mass of the spacecraft. The rocket acceleration due to the main engine thrust is assumed to be large enough so that surface tension forces do not significantly affect the propellant motion during main engine burns. A multi-mass-spring model of the sloshing fuel is introduced to represent the prominent sloshing modes. A nonlinear feedback controller is designed to control the translational velocity vector and the attitude of the spacecraft, while suppressing the sloshing modes. The effectiveness of the controller is illustrated through a simulation example.

scholarly journals Increasing the efficiency of combined control of the rocket engine thrust vector

2019 ◽  
Vol 2019 (2) ◽  
pp. 30-38
Author(s):  
N.S. Pryadko ◽  
◽  
N.P. Syrotkina ◽  
E.L. Tokareva ◽  
◽  
...  
Keyword(s):  
Rocket Engine ◽  
Engine Thrust ◽  
Combined Control ◽  
Thrust Vector

scholarly journals Mathematical model of gas dynamics of a nozzle channel with a gas-dynamic method of thrust vector control using a porous insert

2021 ◽  
Vol 2094 (4) ◽  
pp. 042081
Author(s):  
N A Brykov ◽  
V Yu Kaun ◽  
A A Yatsenko
Keyword(s):  
Vector Control ◽  
Gas Dynamics ◽  
Dynamic Method ◽  
Fundamental Parameter ◽  
Propulsion Systems ◽  
Porous Insert ◽  
Thrust Vector Control ◽  
Gas Dynamic ◽  
Wide Range ◽  
Thrust Vector

Abstract The ability to change the magnitude and direction of the thrust vector is a fundamental parameter of the propulsion systems of aircraft. A wide range of methods for controlling these quantities has been developed, which are used depending on the design schemes. The article discusses the organization of the gas-dynamic method of thrust vector control, carried out using distributed gas injection through a porous insert.

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