Primož Ogrinec (Author), Janko Slavič (Author), Miha Boltežar (Author)

Abstract

In vibration fatigue, three unique types of loads are typical: random, harmonic and impulse. In an application any of these loads are possible. A fatigue-life analysis is possible in the time and frequency domains using the frequency-response function of a structure. Recent studies demonstrated that the impulse loads influence the accuracy of a fatigue-life prediction in the frequency domain. The focus of this research is a theoretical study of an equivalent harmonic load to the impulse load on a single-degree-of-freedom system in order to investigate the feasibility of impulse loads in vibration testing. This research shows that there is a relationship between the impulse and harmonic loads that is related to the underlying dynamic properties (e.g., damping, natural frequency). Based on a theoretical analysis an experimental procedure was developed for both cases of excitation, which was able to confirm the theoretical analysis. Using the modal decomposition the single-degree-of-freedom approach can be generalized to multiple-degrees-of-freedom systems.

Keywords

vibration fatigue;random loads;spectral methods;fatigue life;stationary loading;non-stationary loading;non-Gaussian loading;vibration testing;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 531:620.178.3(045)
COBISS: 16942107 Link will open in a new window
ISSN: 0039-2480
Parent publication: Strojniški vestnik
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Other data

Secondary language: Slovenian
Secondary title: Ekvivalenca harmonskih in impulznih obremenitev v vibracijskem utrujanju
Secondary keywords: vibracijsko utrujanje;naključne obremenitve;spektralne metode;utrujanje materiala;stacionarne obremenitve;ne-stacionarne obremenitve;
Type (COBISS): Article
Pages: str. 631-640, SI 82
Volume: ǂVol. ǂ65
Issue: ǂno. ǂ11/12
Chronology: Nov.-Dec. 2019
DOI: 10.5545/sv-jme.2019.6197
ID: 11392455