Aircraft Hydraulic System Dynamics.
Final rept. June-Dec 72,
BOEING COMMERCIAL AIRPLANE CO SEATTLE WASH
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It is desirable to use computerized analysis techniques in place of costly ground testing and outmoded hand calculations as methods of analyzing aircraft hydraulic system dynamic performance. The current potential for accomplishing this objective was assessed to establish recommendations for future development. Criteria established as desirable features were the use of digital programming and building-block concepts in each of three technical areas Transient Response, Frequency Response, and Thermal Analysis needed to describe a composite of system performance. Basic development work was determined to be accomplished in all three technical areas, but in no area did these efforts meet the USAF objectives. Transient Response capability needs improvement to simulate frequency-dependent friction and cavitation characteristics. Frequency Response programming requires much improvement in the technique for analyzing pumpsystem interactions. Thermal Analysis steady-state analysis programming needs to be expanded to provide transient capability. These efforts are recommended to be accomplished in a coordinated 5-year program with continuous parallel effort being conducted in each of the three technical areas. These efforts involve evaluation of performance characteristics, development of programming subroutines, validation testing against typical aircraft system operational performance, and documentation of programming for general industry use. Author
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