Systems analysis is a process that involves using simulation data to study how components interact when combined to form a larger system. Presently, steady-state data is used for this analysis, requiring that the components are designed to include a transient allowance to ensure physical or operational constraints are not violated during actual operation. For an engine, this involves incorporating a surge margin “stack” into the operating line to ensure that compressors do not stall during large transients; this stack includes allowances for uncertainty in the engine design (engine-to-engine variance and degradation) as well as for losses in surge margin during transient responses.
The purpose of the dynamics systems analysis task is to develop a tool that can be used early in the design process to evaluate the transient capabilities of the engine. This tool can be used to design a simple controller for the preliminary engine that can be used in a closed-loop simulation to approximate the transient response of the design to a prescribed input. These results can be used to show not only the achievable surge margin for the present engine design, but also to suggest possible design changes to improve the transient response while preserving surge margin.
- Mathematical Modeling of Aerospace Components and System Performance