China's space station will be built into a national science laboratory to carry out a large number of scientific experiments. The nitrogen loop system provides unified nitrogen resources for the scientific experiment cabinet in the space station. The safe and stable operation of nitrogen directly affects the operation efficiency of the Space Scientific Experimental Rack. In order to monitor the health status of nitrogen supply system and take into account the launch weight and interface resources, it is necessary to optimize the design of sensors for nitrogen supply system.
In order to save space as much as possible, the nitrogen loop system uses high pressure cylinders and brings potential safety problems. The security situation can be disposed of in a timely manner by monitoring components that affect safety; besides, margin design is used to ensure that accidents do not occur safety accidents. The design of enough sensors to monitor their status can ensure the timely location of faults. At the same time, the number and layout of sensors can be reasonably designed, which can modularized integration and facilitate maintenance.
There are two main functions of sensors in the nitrogen loop system. One is the ability to monitor the real-time state of the nitrogen system, the safety problem can be controlled in time, and the other is the location of the fault depending on the remote measurement of the sensor after the failure occurs. Based on these two purposes, the safety problems caused by the fault are analyzed by measurable coverage. At the same time, the test orientation analysis of the first order fault is carried out for the planned replaceable unit. The Fault Detection and Location about the nitrogen loop system is guaranteed by the rational application of the sensor.
