Recently, modeling and simulation (M&S) has been used to predict the performance of a system in its operating conditions in order to reduce the cost and period of a development. Due to this reason, the necessity of modeling and simulation has been rapidly increased in system developments. A modeling and simulation program for an environmental control system (ECS) of a pod installed under wings of an aircraft was developed in order to estimate the system’s performance during the vehicle flight. First, through the system configuration analysis in the main operational condition of the aircraft system, an ECS configuration adopting an air cycle machine (ACM) was selected. Therefore the modeling program was developed to simulate the ECS with an ACM. Second, the sensitivity analyses on performance variation of main components were conducted to complete the conceptual design of the ECS. A design point for the system and its components was obtained through the analysis with the modeling and simulation program. Third, in order to study the feasibility of the ECS configuration, off-design performances of the ECS on various flight conditions, such as take off, manoeuvre, cruise and landing etc were estimated. Dynamic characteristics were analyzed by transient performance evaluations. From results of this study, overall performances of the ECS were able to be estimated and predicted prior to manufacturing an actual ECS with the modeling and simulation program so that development costs and oversights could be minimized. Moreover an optimum design process has been established for the ECS in this study.

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