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On Evaluation and Modelling of Human Exposure to Vibration and Shock on Planing High-Speed Craft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
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 [en]
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: urn:nbn:se:kth:diva-159168ISBN: 978-91-7595-431-8 (print)OAI: oai:DiVA.org:kth-159168DiVA: diva2:782793
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
List of papers
1. Prediction and evaluation of working conditions on high-speed craft using suspension seat modelling
Open this publication in new window or tab >>Prediction and evaluation of working conditions on high-speed craft using suspension seat modelling
2014 (English)In: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 229, no 3, 281-290 p.Article in journal (Refereed) Published
Abstract [en]

Severe working conditions on board high-speed craft adversely affect not only the safety, health and performance of the crew but also the performance of the vessel as a technical system. Human factors–based ship design combined with appropriate vibration mitigation techniques and work routines for the crew can improve the working conditions and reduce the risks for performance degradation and adverse health effects. To enable development and use of such means, methods for prediction and evaluation of working conditions are needed for both existing high-speed craft and craft under design. This article presents a 2-degree-of-freedom seat model compatible with both measured and simulated input data. The interaction between seat and human is treated using the concept of apparent mass. The model is validated against experiment data collected on board a 10-m, 50-knot high-speed craft equipped with high-standard suspension seats. Evaluation measures defined in ISO 2631-1 and ISO 2631-5 are used to compare experiment data to modelled data. The seat model slightly overestimates the experiment S ed dose by a mean of 6.5% and underestimates the experiment vibration dose value (8 h) by 4.0%. It is concluded that model data correlate well with experiment data.

Keyword
Whole-body vibration, high-speed craft, working conditions, seat model, apparent mass, simulation, ergonomics/human factors, ISO 2631-1:1997, ISO 2631-4:2004, vibration dose
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-159159 (URN)10.1177/1475090213515641 (DOI)000358451100005 ()2-s2.0-84937877525 (Scopus ID)
Note

QC 20150814

Available from: 2015-01-22 Created: 2015-01-22 Last updated: 2017-12-05Bibliographically approved
2. Simulation-based assessment of HSC crew exposure to vibration and shock
Open this publication in new window or tab >>Simulation-based assessment of HSC crew exposure to vibration and shock
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
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:nbn:se:kth:diva-151005 (URN)2-s2.0-84904662073 (Scopus ID)
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
3. On High-Speed Craft Acceleration Statistics
Open this publication in new window or tab >>On High-Speed Craft Acceleration Statistics
(English)Manuscript (preprint) (Other academic)
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-159166 (URN)
Note

QS 2015

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

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