Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.449d&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Physics
Scientific paper
Lightweight, deployable structures representare also quite useful for modal testing. a category of space structures which haveReaction forces obtained from a driven base classically been impossible to adequatelymodal test provide a basis for estimating test in a terrestrial environment.frequency, damping and effective mass of Some of this class of structures has been deemed so critical that their program development includes advanced dynamic testing of scaled structures deployed from the space shuttle cargo bay. A few of the difficulties with arise for these tests include the instrumentation and timing of the experiment (lighting conditions and shuttle operations). International Space Station (ISS) continuous presence in space willThe paper discusses outstanding issues reduces the timing issues. The roboticwhich would be needed prior to ISS capabilities available on ISS can also beimplementation. One potential method of used to apply the input excitationimplementation of the method would be to forces/motions needed (shuttle practise is touse the space station remote manipulator use RCS for excitation).system (SSRMS) to provide driven base The common problem which is presented for deployable structures tested on either ISS or from the space shuttle, relates to instrumentation. Accelerometers remain the highest quality instrumentation. Unfortunately they require cabling - which is difficult to implement on deployable or inflatable structures.. Photogrammetric techniques are being applied for modal tests, but have been difficult to implement in a space environment, to date. There is a third instrumentation concept for acquisition of modal and deployment test data, and that is with the measurement of reaction forces.
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