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 60 s 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.


    Access

    Download


    Export, share and cite



    Title :

    Monitoring and characterization of vibration and shock conditions aboard high-performance marine craft


    Contributors:


    Publication date :

    2019-11-01


    Size :

    14 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Fire Hazards Aboard Pleasure Craft

    Savage, Kent M. | SAE Technical Papers | 1966


    Exposure aboard high-performance marine craft increases musculoskeletal pain and lowers contemporary work capacity of the occupants

    de Alwis, Manudul Pahansen / LoMartire, Riccardo / Äng, Björn O et al. | SAGE Publications | 2021



    Advanced composites for high performance marine craft

    Ness, D.S.R. / Whiley, D.A. | Tema Archive | 1990


    MARINE CRAFT

    MAIM ENRICO | European Patent Office | 2022

    Free access