Accession Number : AD0701377

Title :   DETECTION OF TITAN POGO CHARACTERISTICS BY ANALYSIS OF RANDOM DATA.

Descriptive Note : Rept. for Aug 63-Jul 69,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS

Personal Author(s) : Wagner,R. G. ; Rubin,S.

Report Date : 09 FEB 1970

Pagination or Media Count : 51

Abstract : Dynamic characteristics of Titan vehicles related to the Pogo phenomenon were found through the analysis of low-level random accelerations and pressures from ground test and flight data. Natural frequencies of vibration of propellant suction lines and of flight vehicle longitudinal motion have been successfully detected from locations of peaks in auto spectra. The inflight performance of a standpipe accumulator has been evaluated by means of both auto-spectral and cross-spectral analyses. An anomalous occurrence of Pogo vibration on one flight was explained by the analysis as due to a lack of normal gas charge in the standpipes. A novel method is applied to the evaluation of the longitudinal structural dynamic model of the vehicle. The method involves the detection of 'node frequencies' at locations of accelerometers. (Author)

Descriptors :   (*LAUNCH VEHICLES, STABILITY), STRUCTURAL PROPERTIES, VIBRATION, POWER SPECTRA, RESONANT FREQUENCY, ACCELERATION, FLIGHT TESTING, FUEL PUMPS, FUEL CONSUMPTION, PROPELLANT TANKS, CAVITATION, LIQUID ROCKET PROPELLANTS, BOOSTER ROCKETS, ACCELEROMETERS, HYDRAULIC ACCUMULATORS

Subject Categories : Ground Support Sys & Facil For Space Vehicles

Distribution Statement : APPROVED FOR PUBLIC RELEASE