Research on attitude control strategy of single engine failure in the first-stage flight phase of new generation launch vehicle

Guorui Liao,Jinjie Liu,Tianheng Dou,I Barukčić

doi:10.1051/matecconf/202133602001

Abstract

The successful launching of the new generation of launch vehicle is of great practical significance to the development of China Space, and the cryogenic liquid engine commonly used in the launch vehicle has a certain probability of failures, which may affect the success or failure of rocket launching. In this paper, a Bolza problem optimization algorithm based on Radau pseudo-spectral method is proposed to solve the problem of single engine failure in the first-stage flight phase of the new generation launch vehicle by simulating fault injection and taking the attitude angle as optimal control quantity. The simulation results show that this method can effectively eliminate the influence of single engine failure on orbit injection accuracy, achieve the fault absorption of new generation launch vehicle engine, improve the fault tolerance of attitude control system, and further guarantee the system reliability.

Highlights

The new generation launch vehicle is an important means and strong guarantee for China to explore space resources, develop space technology and implement space strategy
Cryogenic liquid engine is commonly used in the power system design of the new generation launch vehicle, which has complicated structure and bad working environment, and has certain probability of flight failures, which may affect the success or failure of rocket launching
It is important to study the simulation modeling method, optimize the control strategy and reduce the impact of single engine failure on the flight of launch vehicle, which is of great significance to improve the system reliability of the new generation of launch vehicle

Summary

Introduction

The new generation launch vehicle is an important means and strong guarantee for China to explore space resources, develop space technology and implement space strategy. It is important to study the simulation modeling method, optimize the control strategy and reduce the impact of single engine failure on the flight of launch vehicle, which is of great significance to improve the system reliability of the new generation of launch vehicle. If we can change the attitude control strategy in the case of the second stage working normally, it is possible for the rockets to enter orbit It is a realistic problem worthy of study to optimize the attitude control strategy in the case of single engine failure to guarantee the launching success rate of launch mission effectively

Dynamics model of rocket in the first-stage flight phase

Optimization problem in the case of single engine failure

Solving nonlinear problems by Radau pseudo-spectral method

Fault simulation and strategy optimization

Conclusion