Accession Number : ADA256566


Title :   A Modal Analysis and Modelling of a Lightly Damped Large Space Structure


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING


Personal Author(s) : George, Scott E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256566.pdf


Report Date : Jun 1992


Pagination or Media Count : 186


Abstract : This study involves the modification to the PACOSS Dynamic Test Article to create a lightly damped representative large space structure with closely spaced, low frequency modes. An experimental modal analysis is performed to recharacterize the low frequency flexible vibration modes. A finite element model is created using MSC/NASTRAN to predict low frequency behavior using both real eigenvalue analysis and frequency response analysis. Then a reduced order model is created and fine-tuned to represent the dynamics of the structure for the identified low frequency modes.


Descriptors :   *SPACECRAFT , *DAMPING , *SPACE STATIONS , TEST AND EVALUATION , FREQUENCY , MODELS , THESES , RESONANCE , FREQUENCY RESPONSE , DYNAMIC TESTS , FLEXIBLE STRUCTURES , LOW FREQUENCY , BEHAVIOR , EIGENVALUES , FINITE ELEMENT ANALYSIS , MODIFICATION , SCALE MODELS , VIBRATION


Subject Categories : Unmanned Spacecraft
      Manned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE