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Spatial-mode-shape-identification using a continuous wavelet transform
Česnik, Martin (Author), Slavič, Janko (Author), Boltežar, Miha (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-O6RN5ZNF This link opens in a new window

Abstract
V članku je predstavljena eksperimentalno modalna analiza dušenega mehanskega sistema z več prostostnimi stopnjami z uporabo zvezne valčne transformacije. Prikazana je aproksimacija zvezne valčne transformacije pričakovanega impulznega odziva sistema, na podlagi katere je razvit postopek za identifikacijo lastnih frekvenc, razmernikov dušenja in lastnih oblik. Zaradi aproksimacije s končno Taylorjevo vrsto se pri določitvi amplitude oscilacij pojavi računska napaka, ki je prikazana na simuliranem odzivu dinamskega sistema. Predstavljen pristop identifikacije modalnih parametrov je uporabljen na relanih primerih jeklenega nosilca in horizontalnega repa ultralahkega letala. S predlagano metodologijo je možno rekonstruirati prostorske lastne oblike linearnega dinamskega sistema s poljubno geometrijo.

Language:English
Keywords:modal parameters, continuous wavelet transform, spatial vibrations
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2009
Publisher:= Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:str. 277-285
Numbering:Vol. 55, no. 5
UDC:531.533
ISSN on article:0039-2480
COBISS.SI-ID:11054875 Link is opened in a new window
Views:796
Downloads:229
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Secondary language

Language:Slovenian
Abstract:
This paper presents an experimental modal analysis of a damped multi-degree-of-freedom mechanical system using a continuous wavelet transform. An approximation of the wavelet transform of the impulse response function is deduced, which serves as a basis for the extraction of the natural frequencies, the damping ratios and the mode shapes. Due to an approximation with a finite Taylor series, a computational error in the identified oscillatory amplitude occurs and is observed for the simulated system response. The presented approach of modal identification is applied to real mechanical systems, such as a steel beam and the horizontal tail of an ultralight aircraft. Using the proposed measurement methodology, it is possible to reconstruct the spatial mode shapes of any dynamic linear system with an arbitrary geometry.

Keywords:modalni parametri, zvezna valčna transformacija, prostorske vibracije

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