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Fault simulation is an important method in the design of liquid rockets and fault injection is necessary for fault simulation. In this paper, we present a new fault injection method for liquid rocket pressurization and feed systems (PFS) without modifying the system structure. Firstly, we develop a physics-based model of pressurization and feed systems based on Modelica, which describes both nominal and faulty behaviors in a unified way. Then, we describe the new fault injection method, which uses the fault mode library and constructs the association between the Modelica model and the fault mode using customized Modelica annotation in MWorks®. We verify the new method by simulating several typical fault modes such as leakage and clogging. The results show that our method could be easily used to simulate various fault modes in liquid rocket pressurization and feed systems. Moreover, the new fault simulation process indeed plays a role in the system design. Our results could provide some reference for the ongoing research in fault detection and diagnoses.

A New Fault Injection Method for Liquid Rocket Pressurization and Feed System