A hierarchical testability analysis method for reusable liquid rocket engines based on multi-signal flow model

Considering the characteristics of reusable liquid rocket engines, a hierarchical modeling method of Reusable liquid rocket engines testability based on multi-signal flow model is proposed. Then, a testability model at whole engine, subsystem and component level is constructed. Testability analysis, calculation of testability indices and design improvement are conducted to verify the feasibility of the proposed modeling method. This study may provide a feasible way to future design of reusable liquid rocket engines testability.