关键词: 液体推进剂火箭发动机;地面试验;故障检测;数值计算

Abstract: Presents a statistic approach to fault detection of liquid rocket engine to handle starttransient as well as steady-state operating condition in ground firing test. The detection approachfirstly checks the smoothed measurement signals using rectangular filter against safety limits equal topredetermined as well as on-line calculated mean values plus/minus the product of standard deviationvalues and multiplying factors, then if NE1 (the number of anomalous parameters required forconfirming a fault) or more anomalous parameters are simultaneously reported several times in a row,a fault is signaled. The predetermined mean values and standard deviation values are computed fromnormal test data while those on-line computed are from reaI-time measured test data’ The multiplyingfactors are automatically selected through training with normal test data. Computer simulation on tealnormal and abnormaI test data indicated the effectiveness and reliability of this fault detectionapproach.

Key words: Liquid propellant rocket engine;Ground test;Fault detection;Numericalcalculation