8/3/2019 Interaksi Tempat Duduk Penumpang Pada Kapal Cepat_Transportasi Maritim_Coe_tom

1/1

The problemThe vibration environment is sufficiently extreme as to make human testingimpractical from an ethical standpointIn order therefore to gain a better understanding of the problem it must bemodelledIn order to consider horizontal vibrations models are needed to replicate thehuman response to the 3 dimensional problemExisting vibration response models only consider the response to verticalvibration and ignore the horizontal component

Aim To develop 3D human body vibration response models to investigate the human-seat interaction on board a high speed craftTo produce design tools which can inform the designers of high speed craftvibration isolation systems

Background

High speed planing craft are a popular choice for military, rescue,commercial and leisure applicationsThe motions experienced on board such vessels are different tothose found on larger ships and are found to be unpleasant, tiringand painful leading to reduced crew effectiveness and injuryThese motions are experienced in three dimensionsTo date these horizontal components have been ignored byresearchers however international standards suggest they may besignificant

Human Seat Interaction in High Speed Marine CraftTom Coe tec101@soton.ac.uk - School of Engineering Sciences

Supervisors Professor J.T. Xing and R.A. Shenoi

Three dimensional s ingle degreeo f f re ed om lu m pe d m a ss m o de lLumped parameter models replicatingvertical vibration have been developed withbetween 1 and 14 degrees of freedom (dof). Single dof models have been shown toreplicate the apparent mass of the humanbody as well as more complex modelsExperimental data for the horizontal (xand y) directions suggests that one or twodof system would also represent apparentmass in these directions

Using experimental data a model was

developed to replicate apparent mass inthree dimensionsCombined with isolation seat model toinvestigate response to typical boat motions

Three dimensional mechanist ic model T o m o d el t he m e ch a n is m s o f v ib r at io n a t hr e e d im e n si on a lF E m o de l w a s d eve lo pe d th e m o de l i s:

Anatomically correct Material propert ies b ased on experimental data V ali da te d a t g lo ba l a nd c om p on en t l ev el v s la bo r ato r y

tests

FLUID STRUCTURE INTERACTIONS

RESEARCH GROUP

Human-boat-seat Human seat interaction model considers base excitation at deck level The flexibilityof the hull is not considered Incorporation of a structural model of a typical hull section allows the effect ofthestructural response of thehull to be included and quantified

Conclusions 3 D m o de ls a llo w th e e ff ect o f n on -ve rtic al e xc ita tio n to b eanalysedMechanis tic model a l lows alternat ive cr iter ia to b e studiedF ur t he r w o r k C or r e la ti on o f F E m o d el w i th b ac k m u s cl e d a ta C om b in a ti on h u m an -w e d ge m o d el e xc it ed b y w a te r l oa d s Definit ion of operat ional condit ions us ing towing tank data

mh

chx

ms

x

z

y

csx

ksx

khx

khz

ksz

chz

csz

ksy

csy

yb xb

zb

khy

chy

100=deck

seat

VDV

VDVSEAT

4

1

0

4

=

t

aVDV

seatat

seattoapplied

a

Fma

_

__

=

-100

-80

-60

-40

-20

0

20

40

0 0 .0 2 0 . 04 0 .0 6 0 . 08 0 .1 0 .1 2 0 . 14 0 .1 6 0 . 18 0 .2

time (s)

acceleration(ms^-2)

Slam impact

Human responsetypicalfoam seat

Human responsetypicalsuspensionseat

Human responsealt ernative

suspensionseat

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0 500 1000 1500 2000

Frequency (Hz)

Displacement(m)[.1m

excitation]

Location 1

Location 2

Location 3

Location 4

Location 5

Finite element wedge to modelboat transmissibility. a,response, b, model and c,maximum displacement mode

Acknowledgements

This work has been funded by the Engineering and Physical SciencesResearch Council (EPSRC) and assisted by the RNLI and MARSTRUCT,Data logging equipment has been purchased with funds from the Royal

Academy of Engineering and School of Engineering Sciences.

FE Model- vertical response,comparison with experimentaldata

seat

seat

FZ

x=

&

Mechanical impedance (Z) ,where F is force measured atthe seat and is seat velocityx&

a

c

b

0

50000

100000

150000

200000

250000

300000

350000

0 5 10 15 20

Frequency (Hz)

Stress(N/m^2)

Diskstress

Three dimensionalmechanistic humanbody model

z -direction disk stress in thefrequency domain

Model validated using mechanicalimpedance (Z) laboratory data andcomponent level data

Mechanistic model allowsalternative criteria to be studied

such as disk stress