Abstract:

In the thruster altitude simulation test， the plume-field pressure is one of the key parameters characterizing the working properties of the thruster. Aiming at the failure of the pressure measuring system in detecting the variation of the plume-field pressure during working in one test of a solid propellant rocket thruster， we apply the Theory of Inventive Problem Solving （TRIZ） theory to problem analysis， based on which the fault reproduction is performed. Through cause-and-effect chain analysis， the major problem of the pressure measuring system is dedicatedly investigated and determined. Following the problem identification outcome， we propose the improved plume-field pressure measurement strategy in line with the resolution of physical contradiction and substance-field model， as well as the practical testing condition. The insulating paint is sprayed on the internal circuit surface of the pressure sensors to prevent the low-pressure discharge of electronic units. Experimental results reveal the technical efficacy of the revised pressure measurement strategy. Thus， the improved pressure measurement system is capable of more effectively detecting the plume-field pressure， satisfying the measurement demand of the thruster altitude simulation test.

Key words: plume-field pressure measurement, Theory of Inventive Problem Solving (TRIZ), cause-and-effect chain analysis, physical contradiction, substance-field model