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Monitoring and characterization of vibration and shock conditions aboard high-performance marine craft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-8931-2566
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-9110-9401
2018 (English)In: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 233, no 4, p. 1068-1081Article in journal (Refereed) Published
Abstract [en]

The stochastic environmental conditions together with craft design and operational characteristics make it difficult to predict the vibration environments aboard high-performance marine craft, particularly the risk of impact acceleration events and the shock component of the exposure often being associated with structural failure and human injuries. The different timescales and the magnitudes involved complicate the real-time analysis of vibration and shock conditions aboard these craft. The article introduces a new measure, severity index, indicating the risk of severe impact acceleration, and proposes a method for real-time feedback on the severity of impact exposure together with accumulated vibration exposure. The method analyzes the immediate 60s of vibration exposure history and computes the severity of impact exposure as for the present state based on severity index. The severity index probes the characteristic of the present acceleration stochastic process, that is, the risk of an upcoming heavy impact, and serves as an alert to the crew. The accumulated vibration exposure, important for mapping and logging the crew exposure, is determined by the ISO 2631:1997 vibration dose value. The severity due to the impact and accumulated vibration exposure is communicated to the crew every second as a color-coded indicator: green, yellow and red, representing low, medium and high, based on defined impact and dose limits. The severity index and feedback method are developed and validated by a data set of 27 three-hour simulations of a planning craft in irregular waves and verified for its feasibility in real-world applications by full-scale acceleration data recorded aboard high-speed planing craft in operation.

Place, publisher, year, edition, pages
UK: Institution of Mechanical Engineers, 2018. Vol. 233, no 4, p. 1068-1081
Keywords [en]
High-speed craft, Whole-body vibration, Repeated shock, Impact, Epidemiology, Extreme value
National Category
Engineering and Technology
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-260377DOI: 10.1177/1475090218810245Scopus ID: 2-s2.0-85059610722OAI: oai:DiVA.org:kth-260377DiVA, id: diva2:1355446
Note

This research is funded by the Gösta Lundeqvist foundation for ship research (Gösta Lundeqvists stiftelse för skeppsteknisk forskning) and the Swedish Maritime Administration (Sjöfartsverket). QC 20191001

Available from: 2019-09-28 Created: 2019-09-28 Last updated: 2019-10-01Bibliographically approved

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