Abstract
This paper deals with the analysis of recent full-scale strain measurements in the hull of a large container carrier covering several months of operation. The focus is on the real-time prediction accuracy of responses 5-15 seconds ahead of the measurements. Such results are less applicable in the operation of container carriers but are important in e.g. loading/unloading operations at sea or helicopter landings.
Three different procedures are discussed: Conditional processes with analytical estimates of the mean values and standard deviations, the autoregressive predictor method and a method based on superposition of sinus-oidal components. The conditional processes do not need offline training and will be applied to measured time series in order to evaluate the accuracy of response predictions within the next 1-30 seconds. The number of measured points and the time distances between them are varied to determine the best solutions. A procedure based on 11 measured points spaced 1 sec, covering the last 10 sec of the instantaneous measured signal seems generally able to give fair predictions up to 5-10 sec ahead of the current time.
The full-scale data is provided through the EU FP7 project Tools for Ultra Large Container Ships (TULCS) project no. 234146.
Three different procedures are discussed: Conditional processes with analytical estimates of the mean values and standard deviations, the autoregressive predictor method and a method based on superposition of sinus-oidal components. The conditional processes do not need offline training and will be applied to measured time series in order to evaluate the accuracy of response predictions within the next 1-30 seconds. The number of measured points and the time distances between them are varied to determine the best solutions. A procedure based on 11 measured points spaced 1 sec, covering the last 10 sec of the instantaneous measured signal seems generally able to give fair predictions up to 5-10 sec ahead of the current time.
The full-scale data is provided through the EU FP7 project Tools for Ultra Large Container Ships (TULCS) project no. 234146.
| Original language | English |
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| Title of host publication | Proceedings of the PRADS 2013 |
| Number of pages | 8 |
| Publication date | 2013 |
| Publication status | Published - 2013 |
| Event | 12th International Symposium on Practical Design of Ships and Other Floating Structures - Changwon City, Korea, Republic of Duration: 20 Oct 2013 → 25 Oct 2013 Conference number: 12 http://www.prads2013.org/main |
Conference
| Conference | 12th International Symposium on Practical Design of Ships and Other Floating Structures |
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| Number | 12 |
| Country/Territory | Korea, Republic of |
| City | Changwon City |
| Period | 20/10/2013 → 25/10/2013 |
| Internet address |