Aircraft Hydraulic Systems Dynamic Analysis
Final rept. 7 Mar 1974-18 Feb 1977
MCDONNELL AIRCRAFT CO ST LOUIS MO
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This report describes the development and verification of four computer programs used to simulate hydraulic systems under dynamic conditions. The programs were developed by McDonnell Douglas Corp. under contract with the Air Force. The Hydraulic Systems Frequency Response HSFR program predicts the ripple in the flow from piston-type pumps and shows how it is transmitted and attenuated through the system. It predicts the resonant frequencies and the locations and amplitudes of the standing waves of the oscillatory flow and pressure. The Steady-State Flow Analysis SSFAN program defines the system flow and pressure distribution resulting from the simultaneous operation of actuator devices under any combinations of loads and rates. The Hydraulic Transient Analysis HYTRAN program simulates the dynamic response of a system to sudden changes in load flow demand. The typical input to the system is a valve motion from which pressure and flow disturbances propagate through the system, causing pump and component responses. The Hydraulic Transient Thermal Analysis HYTTHA program predicts the effects of system heat generation and dissipation of the temperatures and performance of a hydraulic system.
- Hydraulic and Pneumatic Equipment