Accession Number : ADA076059
Title : Investigation of Pressure Surges in Aircraft Hydraulic Systems
Descriptive Note : Technical rept.
Corporate Author : NORTH AMERICAN AVIATION INC LOS ANGELES CA
Personal Author(s) : Housel, E A
Report Date : Mar 1952
Pagination or Media Count : 173
Abstract : Theoretical and experimental studies were made to determine the effects of numerous system and component parameters on the magnitude and frequency of pressure surges which occur upon opening or closing a valve in a hydraulic system. It was found necessary to consider the system as a composite unit, due to the complex manner in which the effective resistances, inductances, and capacitances of the system components affected surge characteristics. Electric analogs have been proposed as a convenient means for system analysis, and theoretical approaches for their practical application have been developed. Analytical studies of existing and experimental data were made to determine the effect of pressure surges on the fatigue characteristics of various hydraulic system components. These studies indicated the magnitude of the surge to be of primary concern, with frequency and rate of pressure rise showing only secondary effects. Secondary high-frequency oscillations were found particularly undesirable because of their excessive peaks, but certain information pertinent to their control has been obtained.
Descriptors : *SURGES , *DYNAMIC PRESSURE , *HYDRAULIC EQUIPMENT , AIRCRAFT EQUIPMENT , ACCUMULATORS , TUBES , FITTINGS , HYDRAULIC ACTUATORS , HOSES , HYDRAULIC VALVES
Subject Categories : Aircraft
Hydraulic and Pneumatic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE