Towards consonance in working conditions, health and performance aboard high-performance marine craft

Doctoral Thesis in Vehicle and Maritime Engineering

Towards consonance in working

conditions, health and performance aboard high-performance

marine craft

PAHANSEN DE ALWIS

Stockholm, Sweden 2020 www.kth.se

ISBN 978-91-7873-635-5 TRITA-SCI-FOU 2020:28

kth royal institute of technology

Pahansen de alwis Towards consonance in working conditions, health and performance aboard high-performance marine craftKTH 2020

Towards consonance in working

conditions, health and performance aboard high-performance

marine craft

PAHANSEN DE ALWIS

Doctoral Thesis in Vehicle and Maritime Engineering KTH Royal Institute of Technology

Stockholm, Sweden 2020

Academic Dissertation which, with due permission of the KTH Royal Institute of Technology, is submitted for public defence for the Degree of Doctor of Philosophy on Tuesday the 29^th of September, 2020 at 1000hrs, in Room No: 132 (Code: F3), Lindstedtsvägen 26,

KTH Royal Institute of Technology, Stockholm, Sweden.

© Pahansen de Alwis

TRITA-SCI-FOU 2020:28 ISBN 978-91-7873-635-5

Printed by: Universitetsservice US-AB, Sweden 2020

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0 1 2 3 4 5 6 7 8

0 1 2 3 4 5

Sed [MPa]

Number of fatigue symptoms 0

1 2 3 4 5 6 7 8

Very Smooth Smooth Rough Very Rough

Sed [MPa]

Ride Quality

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Parameter Selection criterion

Craft Person

Displacement (C1) IF (D > S AND D > P)

Semi-displacement (C2) IF (S > D AND S > P) OR (S = D AND S > P)

Planing (C3) IF (P = D AND P = S) OR (P > D AND P > S) OR (P = D AND P > S) OR (P = S AND P > D)

Level of exposure

High aboard X IF (Craft Person = X) AND

(Work duration per month at sea aboard X craft > 40hrs per month) Low aboard X IF level of exposure ് High

Frequency of rough working conditions

High Sometimes or practically always aboard X craft (Item No. 26 in Q1) Low Never or almost never aboard X craft (Item No. 26 in Q1)

Severity of exposure

Severe aboard X craft IF (Level of exposure = High aboard X) AND (Frequency of rough working conditions = High) Not severe aboard

X craft IF severity of exposure ് Severe

D – Percentage of work duration per month aboard displacement craft (Item No. 22 & 25 in Q1) S – Percentage of work duration per month aboard semi-displacement craft (Item No. 22 & 25 in Q1) P – Percentage of work duration per month aboard planing craft (Item No. 22 & 25 in Q1) X – C1, C2 and C3





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Parameter Selection criterion

Fatigue score

High (2 symptoms or more Few^*) OR (2 symptoms or more Daily⁺) Low IF fatigue score ് High

Pain score

High IF (X pain = Yes) AND (Frequency of X pain = Daily) AND (X pain reducing workability = Yes)

Low IF pain score ് High

Performance degradation Yes IF (Fatigue score = High) OR (Pain score = High) No IF performance degradation ് Yes

* Few – A few times per week (Item No. 30 in Q1)

+ Daily – Daily or almost daily (Item No. 30 in Q1)

X – Pain site (Head, Upper back, Lower back, Shoulder, Elbow, Hand, Hip, Knee and Foot)



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Area of the body Round-1

n (%)⁺

Round-2 n (%)⁺

Any area of the body 242 (70.8) 237 (72.9)

Head 45 (13.2) 52 (16.0)

Neck 93 (27.2) 103 (31.7)

Upper back 50 (14.6) 51 (15.7)

Lower back 165 (48.2) 142 (43.7)

Shoulder 76 (22.2) 80 (24.6)

Elbow 23 (6.7) 22 (6.8)

Hand 9 (2.6) 9 (2.8)

Hip 25 (7.3) 18 (5.5)

Knee 66 (19.3) 60 (18.5)

Foot 20 (5.8) 20 (6.2)

+ Percentages have been calculated based on the total number of subjects, i.e. 342 in Round-1 and 325 in Round-2



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