Harmonic equivalence of the impulse loads in vibration fatigue

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

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.

• Language: English
• Keywords: vibration fatigue, random loads, spectral methods, fatigue life, stationary loading, non-stationary loading, non-Gaussian loading, vibration testing
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: Str. 631-640
• Numbering: Vol. 65, no. 11/12
• PID: 20.500.12556/RUL-113726
• UDC: 531:620.178.3(045)
• ISSN on article: 0039-2480
• DOI: 10.5545/sv-jme.2019.6197
• COBISS.SI-ID: 16942107
• Publication date in RUL: 29.01.2020

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [etc.], = Association of Mechanical Engineers and Technicians of Slovenia [etc.
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Secondary language

• Language: Slovenian
• Title: Ekvivalenca harmonskih in impulznih obremenitev v vibracijskem utrujanju
• Keywords: vibracijsko utrujanje, naključne obremenitve, spektralne metode, utrujanje materiala, stacionarne obremenitve, ne-stacionarne obremenitve

Projects

• Funder: ARRS - Slovenian Research Agency
• Funding programme: Programska skupina
• Project number: P2-0263
• Name: Mehanika v tehniki