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Simulation-based assessment of HSC crew exposure to vibration and shock
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-9110-9401
2013 (English)In: FAST 2013 - 12th International Conference on Fast Sea Transportation, FAST 2013 Secretariat , 2013Conference paper, Published paper (Refereed)
Abstract [en]

A simulation-based method for assessment of HSC crew vibration and shock exposure is presented. The simulation scheme includes three modules: Craft response module, Seat response module and Human exposure evaluation module. The first module computes the craft acceleration in the time-domain by a non-linear strip method and delivers input to the second module, where a crew seat model determines the human acceleration exposure time history. The crew's acceleration exposure is assessed in the third module, which includes a strategy to describe the operational profile. The human vibration exposure is evaluated using international standards (ISO 2631-1, ISO 2631-5). In addition, statistical extreme value analyses are used to evaluate the human exposure to shock. The potential to reduce the vibration and shock level is discussed and exemplified using the simulation-based evaluation method to analyse how different seat designs and running attitudes influence the crew vibration exposure.

Place, publisher, year, edition, pages
FAST 2013 Secretariat , 2013.
Keyword [en]
Civil engineering, Transportation, Exposure-time, Extreme value analysis, Human exposures, Human vibrations, International standards, Operational profile, Simulation-based method, Vibration exposure, Time domain analysis
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-151005Scopus ID: 2-s2.0-84904662073OAI: oai:DiVA.org:kth-151005DiVA: diva2:746219
Conference
12th International Conference on Fast Sea Transportation, FAST 2013, 2 December 2013 through 5 December 2013, Amsterdam, Netherlands
Note

QC 20140912

Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2015-01-26Bibliographically approved
In thesis
1. On Evaluation and Modelling of Human Exposure to Vibration and Shock on Planing High-Speed Craft
Open this publication in new window or tab >>On Evaluation and Modelling of Human Exposure to Vibration and Shock on Planing High-Speed Craft
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High speed in waves, necessary in for instance rescue or military operations, often result in severe loading on both the craft and the crew. To maximize the performance of the high-speed craft (HSC) system that the craft and crew constitute, balance between these loads is essential. There should be no overload or underuse of crew, craft or equipment. For small high-speed craft systems, man is often the weakest link. The human exposure to vibration and shock results in injuries and other adverse health effects, which increase the risks for non-safe operations and performance degradation of the crew and craft system. To achieve a system in balance, the human acceleration exposure must be considered early in ship design. It must also be considered in duty planning and in design and selection of vibration mitigation systems.

The thesis presents a simulation-based method for prediction and evaluation of the acceleration exposure of the crew on small HSC. A numerical seat model, validated with experimental full-scale data, is used to determine the crew's acceleration exposure. The input to the model is the boat acceleration expressed in the time domain (simulated or measured), the total mass of the seated human, and seat specific parameters such as mass, spring stiffness and damping coefficients and the seat's longitudinal position in the craft. The model generates seat response time series that are evaluated using available methods for evaluation of whole-body vibration (ISO 2631-1 \& ISO 2631-5) and statistical methods for calculation of extreme values.

The presented simulation scheme enables evaluation of human exposure to vibration and shock at an early stage in the design process. It can also be used as a tool in duty planning, requirements specification or for design of appropriate vibration mitigation systems. Further studies is proposed within three areas: investigation of the actual operational profiles of HSC, further development of seat models and investigation of the prevailing injuries and health problems among the crew of HSC.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xiv, 61 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2015:01
Keyword
whole-body vibration, high-speed craft, working conditions, seat modelling, apparent mass, ergonomics, human factors, ISO 2631-1, ISO 2631-5, extreme values, acceleration statistics, slamming
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-159168 (URN)978-91-7595-431-8 (ISBN)
Presentation
2015-02-12, D3, Lindstedtsvägen 5, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150126

Available from: 2015-01-26 Created: 2015-01-22 Last updated: 2015-01-26Bibliographically approved

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Garme, Karl

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