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Spectral shift of damped harmonic vibrations and methods for compensation
Author(s) -
Großmann Rainer
Publication year - 1999
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/(sici)1097-0207(19991030)46:6<911::aid-nme700>3.0.co;2-2
Subject(s) - vibration , acoustics , harmonic , signal (programming language) , frequency domain , interference (communication) , compensation (psychology) , natural frequency , noise (video) , resonator , frequency spectrum , physics , control theory (sociology) , engineering , computer science , optics , spectral density , mathematics , electrical engineering , telecommunications , mathematical analysis , channel (broadcasting) , psychology , psychoanalysis , image (mathematics) , control (management) , artificial intelligence , programming language
Resonators, especially quartz devices, can be used as remote sensors. The signal they produce as pulse response consists of a damped harmonic vibration where the natural frequency contains the information about the measured quantity. Under the viewpoint of noise and interference the most efficient evaluation of the signal can be carried out in the frequency domain. For an undamped vibration the spectrum has a peak at the actual natural frequency. The problem is that the maximum of the spectrum of a damped vibration depends on uncertain parameters: damping and phase shift. In this paper several methods are discussed with which this effect can be eliminated, so that the natural frequency may be determined regardless of these parameters. Copyright © 1999 John Wiley & Sons, Ltd.