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An F-16 Environmental Control System (ECS) computer model was developed to assist engineers with the design and development of ECS control algorithms. This model consists of many dynamic component modules (ducts, valves, heat exchangers, compressor, etc.). The accuracy of this analysis tool was verified by comparing model results to F-16 ECS test-stand and test-aircraft data - the verification results are in excellent agreement. Presented in this paper are modeling techniques, model descriptions, verification results, discussion of test-stand data reduction and comparison, and discussion of the comparison with flight-test data. Our F-16 ECS model is a viable and accurate simulation tool for concurrent analysis and design of environmental control systems.

The HYdraulic TRansient ANalysis (HYTRAN) program has under gone extensive revisions that correct and enhance the program to meet the needs of those analyzing and/or designing aerospace hydraulic systems. Presented in this paper are a discussion of the revisions, a detailed explanation for the changes, and evidence from flight-test data that the improved HYTRAN program can meet the needs of the aerospace industry. The revisions affect all aspects of the HYTRAN program: steady-state analysis, transient analyses, hydraulic component models, and overall program improvements. The effects of these revisions on hydraulic analyses have been to 1) correct previous steady-state and transient solution errors, 2) reduce user handling time, 3) increase computational efficiency, and 4) improve HYTRAN's hydraulic component library.

This investigation analyzes the concept of centrally locating components in hydraulic system design to yield increased aircraft survivability. This concept locates aircraft hydraulic hardware in centrally located armor-protected enclosures. The approach taken for analysis purposes consists of (1) development of a baseline hydraulic system; (2) development of two hydraulic system design options, Options A and B, incorporating centrally located hydraulic system armor protected for survivability; (3) evaluation of the relative merit of Options A and B by comparison to the baseline configuration, and development of a third design, Option C incorporating these results and other ideas.