Application of QGA-BP for Fault Detection of Liquid Rocket Engines

In order to overcome the shortcomings of traditional BP (Back Propagation) and single GA (Genetic Algorithm), a method based on QGA (Quantum Genetic Algorithm) is proposed to optimize the BP neural network for fault detection of liquid rocket engines. In this QGA-BP method, a dynamic improvement strategy is adopted to adjust the rotation angle according to the evolution situation, and a quantum catastrophe strategy is used as a operation criterion during evolution. Then the improved QGA is used to optimize the weight and threshold of BP neural network from multiple spots. This method is applied to a typical fault detection process of a liquid rocket engine. Representative history test data of engine state is used to verify this method, and the results show that the convergence speed, the evolution generation and the accuracy of fault detection of QGA-BP model are all improved compared with the traditional BP neural network and the single GA.