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RISK, QUALITY AND RELIABILITY – RQR ‘07 September 20-21, 2007 Technical University of Ostrava, Czech Republic. Components redundancy in power and propulsion systems installed onboard platform supply vessels. Dr inż. Leszek Chybowski Prof. dr hab. inż. Zbigniew Matuszak.

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components redundancy in power and propulsion systems installed onboard platform supply vessels

RISK, QUALITY AND RELIABILITY – RQR ‘07

September 20-21, 2007

Technical University of Ostrava, Czech Republic

Components redundancy

in power and propulsion systems

installed onboard platform supply vessels

Dr inż.Leszek Chybowski

Prof. dr hab. inż. Zbigniew Matuszak

Mgr inż. Paweł Pełka

slide2

Minutes of presentation

  • Dynamic positioning (DP) systems classification
  • Platform supply vessels characteristics
  • Power and propulsion plants characteristics
  • Propulsion and power plants components redundancy
  • Final conclusion
slide3

(A. J. SØRENSEN 2004)

Dynamic Positioning Class 1 (IMO MSC/Circ.645)

slide4

(A. J. SØRENSEN 2004)

Dynamic Positioning Class 2(IMO MSC/Circ.645)

slide5

(A. J. SØRENSEN 2004)

Dynamic Positioning Class 3(IMO MSC/Circ.645)

slide7

Power and propulsion plants configuration

UT 755 hull design

UT 755 L hull design

slide8

z(X,t) - complex number plane position for system X is:

where:p(X, t) - number of basic components

r(X, t) - number of standby components

i- imaginary unit

For a given moment of time t≥0 the total number

of components J(X,t) in the system X equals:

where: J(X,0) - size of the system X at t=0

JREST- number of components of the system X thathave been failed till the time t.

Redundancy in different DP classes

slide9

Components redundancy in

power and propulsion plant systems

ES1-1 – DP control unit

ES1-2 – DP supervision station

ES1-3 – manual control system

ES2-1 – main generator sets

ES2-2 – main switchboard

ES2-3 – gensets auxiliary systems

ES2-4 – mains switchboard buses

ES3-1 – ship’s main propulsion unit

ES3-2 –main propulsion rudder

ES4-1 – uninterrupted power supply

ES4-2 – battery set

ES4-3 – emergency power plant

ES5-1 – gyrocompass

ES5-2 – anemometer

slide10

Reliability calculation based on redundancy model

For the subsystem X with a threshold k-out-of-n structure composed

of identical components EX the system reliability is:

For the threshold structure k-out-of-n composed of components

E1, E2,…En with various reliability characteristics system reliability is:

slide11

Reliability calculation for DP thrusters

(forexponentional failures distribution and generic data)

slide12

Final conclusion

Component redundancy model allows to compare different redundancy classes (DP Classes)

Component redundancy model allows to compare different systems in same redundancy class

Component redundancy model allows to number of transformations and particular measures estimation

There is possibility of application of redundancy model for reliability estimation