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odeInnovation - Transition Piece Foundations can account for 25% of the overall cost and may

use up to 50% of the fabrication time Increasing fabrication costs over the last decade;

supply chain constraints and volatility in the price of material

ost optimi!ation is essential

TP provides the main load transfer from the turbine to"er to the#ac$et substructure

TP is a critical component of the "ind turbine structure

Therefore the integrity and cost of the TP is critical to the "holedesign

&'( has designed several innovative transition piece conceptsfrom "hich t"o have the potential to reduce the overall cost of"ind turbines support structures;

-

Plated Transition Piece- onical Transition Piece

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odeInnovation ) &'( Plated TP

*rea of highest +tress

concentration dramatically

affecting fatigue life and

hence plated design

7/23/2019 PLated Transition Piece and Comparison

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odeonventional vs Plated TPsonventional TP

Heavy weight Oval section/Complex castings / welding

operations required. The need for specialist fabricators limiting

supply chain options

High stress concentrations at central column /support arms interface, requiring heavy

sections to achieve load transfer efficiency to

meet acceptable fatigue life criteria ifficult to inspect the overlaid weld and tube

internal weld

Plated TP

relatively light simple conventional plate fabrication methods !imple fab " #vailable local supply chain !pecial fatigue resistant detail $%!tress

&elieving 'ings( greatly improved fatigue life

) factor of * to + #bility to reduce stress locally without need

for complete T resi-ing ase of maintenance / inspection with weld

open for access eading to extended life and reduce costs of

wind turbine support structures

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odeT"isted #ac$et vs Plated TP ,ac$ets .T"isted #ac$et

0. Heavy weight

1. Complex 2 tubular

fabrication / welding operations

required as shown in the

mainstream pro3ect

2. The need for specialist

fabricators limiting supply

chain options

*. High stress concentrations at

central column / support brace

interface, requiring heavy

sections to meet acceptable

fatigue life criteria

+. lac4 of redundancies hence

fatigue crac4 can lead to

system failure during operation

Plated TP Jacket

0. relatively light

1. simple conventional plated

fabrication

2. !imple fab " #vailable localsupply chain

*. !pecial fatigue resistant

detail $%!tress &elieving

'ings( greatly improved

fatigue strength, a factor of *

to +, hence steel saving can

be made+. 5ood redundancy hence

early fatigue crac4 is

tolerance during operation.

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odeT"isted #ac$et vs Plated TP ,ac$ets 2.T"isted #ac$et

0. !mall base width hence larger

and longer piles required

1. ile in large battered angle

which can lead to reduced

piling efficiency and piling

refusal/lateral vibration or

movement2. &emedial measures for pile

refusal such as drilling is

difficult

*. ow natural frequency in the

torsional vibration mode can

bring fatigue problem during

the detailed design stage+. iling is to be done together

with structure, which brings

scheduling problem

Plated TP Jacket

0. 6ac4et base width can be

ad3usted to reduce piling

needs1. ile efficiency high hence

chance of piling refusal low

2. &emedial measure for pile

refusal such as drilling are

available in conventional

technique

*. High natural vibration modefor torsional mode

+. re piling can be conducted

to optimi-e offshore

operation

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odeInnovation ) &'( Plated Transition Piece

+imple load transfer via

plates

(asy fabrication

/elatively light "eight

igh fatigue strength from

reduced stress due to acombination of1

+imple load transfer

stress relieving "ing

detail /educed *P( cost

(asy maintenance and repair

leading to reduced &P( cost

Figuratively representative TP.

Patent Applied

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ode

Inclined Plate Central C lumn

Without Wing With Wing Fatigue Factor Without Wing With Wing Fatigue Factor

Maximumstress at 40 mmrom intersection

!4" MPa

#4$%&0!psi'

(&.4 MPa

#)"%*!)psi'

346 "4* MPa

#!*%*!4psi'

)"$ MPa

#)(%+)0psi'

40

Position omaximum stress

Weldtermination point

,on-eldtermination point

Weldtermination point

,on-eldtermination point

atigue limitingstress at )0/+cycles

4).*" Mpa

#&%0""psi'

*).&! Mpa

#+%4((psi'

427 4).*" Mpa

#&%0""psi'

*).&! Mpa

#+%4((psi'

)."4

ompounded 742 2436

Innovation +tress oncentrations 8 Fatigue

(9uivalent Fatigue loading used for analysis is supplied

by +iemens for :eneris Fatigue load under urricane

condition

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odeInnovation - Plated TP :eometric Features1

Top section 1olted to the WT2

toer 1ase

Middle platorm provide easy

operational space

Access into the loer section o

the transition piece possi1le. 3ec plate can 1e grated to

urther reduce eight.

5ottom section connected to the

legs o 6acet structure% directly

transerring loads

Flexi1le 6acet leg spacing.

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ode+tructural 'ra"ings ) Transition piece

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ode+tructural 'ra"ings - Isometric

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ode+tructural Illustration