Fault diagnosis of rocket engine ground testing bed with self-organizing maps(SOMs)

To solve the fault diagnosis problem of liquid propellant rocket engine ground testing bed,a fault diagnosis approach based on self-organizing map(SOM)is proposed.The SOM projects the multidimensional ground testing bed data into a two-dimensional map.Visualization of the SOM is used to cluster the ground testing bed data.The out map of the SOM is divided to several regions.Each region is represented for one fault mode.The fault mode of testing data is determined according to the region of their labels belonged to.The method is evaluated using the testing data of a liquid-propellant rocket engine ground testing bed with sixteen fault states.The results show that it is a reliable and effective method for fault diagnosis with good visualization property.

方寸中的世界载人航天之“最”(下)

最早进行太空飞行的载人飞船:苏联的单座“东方1号”飞船(图⑾)。1961年4月12日,它由“东方号”运载火箭(图⑿)发射。飞船由球形再入舱、仪器舱和推火箭发动机组成,总重量约4.7吨。生命保障系统可供飞行10昼夜。飞船既可以自动控制,也可由航天员手动控制。再入舱返回地球距地面高度7千米时。

纸上谈兵

使反舰导弹从亚音速提高到超音速,方法一般是采用冲压发动机或火箭发动机,但同时会带来射程减少或体积增大的弊端。所以我设想了一种两级反舰导弹:第一级由涡轮喷气发动机和燃料箱组成,第二级由导引头、战斗部。