Comparison of Calculating Algorithms for Logarithmic Decrements Applied to Welded Joints Assessments

Adam Szeleziński*1 http://orcid.org/0000-0003-2842-0683     Adam Muc2 https://orcid.org/0000-0002-9495-087X     Lech Murawski3 https://orcid.org/0000-0003-0089-5492     Tomasz Muchowski4 https://orcid.org/0000-0002-0200-7041     Marcin Kluczyk5 https://orcid.org/0000-0001-7357-6762     Krzysztof Jasiński6 https://orcid.org/0000-0001-8355-6167     Romana Antczak-Jarząbska7 https://orcid.org/0000-0002-6853-2041     

* Corresponding author

1

Gdynia Maritime University, 81-87 Morska St., 81-225 Gdynia, Poland, Faculty of Maritime Engineering, a.szelezinski@wm.umg.edu.pl

2

Gdynia Maritime University, 81-87 Morska St., 81-225 Gdynia, Poland, Faculty of Electrical Engineering, a.muc@we.umg.edu.pl

3

Gdynia Maritime University, 81-87 Morska St., 81-225 Gdynia, Poland, Faculty of Maritime Engineering,
l.murawski@wm.umg.edu.pl

4

Gdynia Maritime University, 81-87 Morska St., 81-225 Gdynia, Poland, Faculty of Maritime Engineering, t.muchowski@wm.umg.edu.pl

5

Polish Naval Academy of the Heroes of Westerplatte, 69 Śmidowicza Street, 81-127 Gdynia, Poland, Faculty of Mechanical and Electrical Engineering, m.kluczyk@amw.gdynia.pl

6

Gdynia Maritime University, 81-87 Morska St., 81-225 Gdynia, Poland, Faculty of Electrical Engineering,
k.jasinski@we.umg.edu.pl

7

WSB University in Gdańsk, 238A Grunwaldzka St., 80-266 Gdańsk, Faculty of Computer Science and New Technologies, rantczak@wsb.gda.pl

Abstract: 

There are numerous non-destructive methods in welded joints investigation, but the most promising, especially in applications with steady monitoring of the structure, is the vibro-diagnostic approach. In the course of the research work, the responses were obtained and detected by accelerometers, providing valuable diagnostic information, which later was mathematically processed in the field of time or frequency. The mathematical processing aimed to distinguish significant characteristics embedded in the processes typical of the investigated joints and allow an assessment of how they were made. For this purpose, two methods were proposed, based on determining the logarithmic decrement as a function of time. Due to the complicated course of the impact responses, the method of calculating the logarithmic decrement has been suggested, involving the approximation of responses with various functions. According to the research, the analysis of changes in the logarithmic decrement as a function of time applied to welded plates was proposed, as it enables the initial assessment of joint quality.

Keywords: 
diagnostics, welded joints, non-destructive research, SHM, vibrations, spectral analysis, logarithmic decrement.
Issue: 
124
Pages: 
7
19
Doi: 
10.26408/124.01
Submitted: 
05.07.2022
Accepted: 
25.08.2022
Published: 
31.12.2022
Download full text in pdf: 
PDF icon SJ_124_01.pdf

This article is an open access article distributed under a Creative Commoms Attribution (CCBY 4.0) licence

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Adam Szeleziński

Citation pattern: Szeleziński A., Muc A., Murawski L., Muchowski T., Kluczyk M., Jasiński K., Antczak-Jarząbska R., Comparison of Calculating Algorithms for Logarithmic Decrements Applied to Welded Joints Assessments, Scientific Journal of Gdynia Maritime University, No. 124, pp. 7-19, 2022

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