Variance of the fatigue damage due to a Gaussian narrowband process
The fatigue life of a structure is inherently random when the loading is irregular. There is a vast body of literature on the analysis of the mean fatigue damage, but very few studies have been devoted to the variance. This paper presents an improved method for analyzing the variance of the damage f...
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| Format: | Journal Article |
| Language: | English |
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2013
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| Online Access: | https://hdl.handle.net/10356/96661 http://hdl.handle.net/10220/10340 |
| _version_ | 1826130069820538880 |
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| author | Low, Ying Min. |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Low, Ying Min. |
| author_sort | Low, Ying Min. |
| collection | NTU |
| description | The fatigue life of a structure is inherently random when the loading is irregular. There is a vast body of literature on the analysis of the mean fatigue damage, but very few studies have been devoted to the variance. This paper presents an improved method for analyzing the variance of the damage for any narrowband Gaussian process. The field of application is not confined to the linear oscillator, unlike approaches in previous studies. The method is simple to apply; it involves a single summation for arbitrary processes, and closed form solutions are available for special cases (linear oscillator and bandpass process). The effectiveness of the method is demonstrated through case studies encompassing a variety of systems, including a realistic spectrum commonly seen in offshore engineering. Using rainflow counting of simulated time domain stresses as a benchmark, the proposed method is shown to yield a highly precise prediction of the variance. Moreover, it is significantly more accurate than an existing method for the linear oscillator system. |
| first_indexed | 2024-10-01T07:50:31Z |
| format | Journal Article |
| id | ntu-10356/96661 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:50:31Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/966612020-03-07T11:43:44Z Variance of the fatigue damage due to a Gaussian narrowband process Low, Ying Min. School of Civil and Environmental Engineering The fatigue life of a structure is inherently random when the loading is irregular. There is a vast body of literature on the analysis of the mean fatigue damage, but very few studies have been devoted to the variance. This paper presents an improved method for analyzing the variance of the damage for any narrowband Gaussian process. The field of application is not confined to the linear oscillator, unlike approaches in previous studies. The method is simple to apply; it involves a single summation for arbitrary processes, and closed form solutions are available for special cases (linear oscillator and bandpass process). The effectiveness of the method is demonstrated through case studies encompassing a variety of systems, including a realistic spectrum commonly seen in offshore engineering. Using rainflow counting of simulated time domain stresses as a benchmark, the proposed method is shown to yield a highly precise prediction of the variance. Moreover, it is significantly more accurate than an existing method for the linear oscillator system. 2013-06-13T06:24:50Z 2019-12-06T19:33:39Z 2013-06-13T06:24:50Z 2019-12-06T19:33:39Z 2011 2011 Journal Article Low, Y. M. (2012). Variance of the fatigue damage due to a Gaussian narrowband process. Structural Safety, 34(1), 381-389. 0167-4730 https://hdl.handle.net/10356/96661 http://hdl.handle.net/10220/10340 10.1016/j.strusafe.2011.09.001 en Structural safety © 2011 Elsevier Ltd. |
| spellingShingle | Low, Ying Min. Variance of the fatigue damage due to a Gaussian narrowband process |
| title | Variance of the fatigue damage due to a Gaussian narrowband process |
| title_full | Variance of the fatigue damage due to a Gaussian narrowband process |
| title_fullStr | Variance of the fatigue damage due to a Gaussian narrowband process |
| title_full_unstemmed | Variance of the fatigue damage due to a Gaussian narrowband process |
| title_short | Variance of the fatigue damage due to a Gaussian narrowband process |
| title_sort | variance of the fatigue damage due to a gaussian narrowband process |
| url | https://hdl.handle.net/10356/96661 http://hdl.handle.net/10220/10340 |
| work_keys_str_mv | AT lowyingmin varianceofthefatiguedamageduetoagaussiannarrowbandprocess |