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This paper presents the results of an investigation to improve design/analysis techniques for aircraft hydraulic systems. A design/analysis tool was developed by integrating control-surface commands and loads obtained from Aircraft Dynamic Simulator Software (ADSS) with an enhanced version of the HYdraulic TRansient ANalysis (HYTRAN) program. Control-surface commands and loads from an ADSS simulation of a selected maneuver were used as dynamic input to the HYTRAN program so that the hydraulic system response could be predicted throughout the maneuver. Predicted hydraulic system pressures and control-surface positions from the HYTRAN simulation of the maneuver were compared to flight-test data and were found to be in excellent agreement. The successful coalescence of the two independent software programs gives engineers a concurrent design/analysis tool that can be used to optimize hydraulic system designs during the very early stages of design.

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.