000015539 001__ 15539
000015539 005__ 20161115135322.0
000015539 04107 $$aeng
000015539 046__ $$k2013-06-12
000015539 100__ $$aWijker, J.
000015539 24500 $$aCharacterization and Synthesis of Random Acceleration Vibration Specifications

000015539 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015539 260__ $$bNational Technical University of Athens, 2013
000015539 506__ $$arestricted
000015539 520__ $$2eng$$aRandom acceleration vibration specifications for subsystems, i.e. instruments, equipment, are most times based on measurement during acoustic noise tests on system level, i.e. a spacecraft and measured by accelerometers, placed in the neighborhood of the interface between spacecraft and subsystem. Tuned finite element models can be used to predict the random acceleration power spectral densities at other locations than available via the power spectral density measurements of the acceleration. The measured and predicted power spectral densities do represent the modal response characteristics of the system and show many peaks and valleys. The equivalent random acceleration vibration test specification is a smoothed, enveloped, peak-clipped version of the measured and predicted power spectral densities of the acceleration spectrum. The original acceleration vibration spectrum can be characterized by a different number response spectra: Shock Response Spectrum (SRS) , Extreme Response Spectrum (ERS), Vibration Response Spectrum (VRS), and Fatigue Damage Spectrum (FDS). An additional method of non-stationary random vibrations is based on the Rayleigh distribution of peaks. The response spectra represent the responses of series of SDOF systems excited at the base by random acceleration, both in time and frequency domain. The synthesis of equivalent random acceleration vibration specifications can be done in a very structured manner and are more suitable than equivalent random acceleration vibration specifications obtained by simple enveloping. In the synthesis process Miles’ equation plays a dominant role to invert the response spectra into equivalent random acceleration vibration spectra. A procedure is proposed to reduce the number of data point in the response spectra curve by dividing the curve in a numbers of fields. The synthesis to an equivalent random acceleration

000015539 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015539 653__ $$aRandom vibrations, random vibration testing, random response analysis, damage response spectra.

000015539 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015539 720__ $$aWijker, J.$$iEllenbroek, M.$$ide Boer, A.
000015539 8560_ $$ffischerc@itam.cas.cz
000015539 8564_ $$s1160716$$uhttps://invenio.itam.cas.cz/record/15539/files/1041.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 03 PROGRESS AND CHALLENGES IN SPACECRAFT STRUCTURAL DYNAMICS
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000015539 962__ $$r15525
000015539 980__ $$aPAPER