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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.

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

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  1. 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

  2. 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

  3. (A. J. SØRENSEN 2004) Dynamic Positioning Class 1 (IMO MSC/Circ.645)

  4. (A. J. SØRENSEN 2004) Dynamic Positioning Class 2(IMO MSC/Circ.645)

  5. (A. J. SØRENSEN 2004) Dynamic Positioning Class 3(IMO MSC/Circ.645)

  6. Analysed vessels characteristics

  7. Power and propulsion plants configuration UT 755 hull design UT 755 L hull design

  8. 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

  9. 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

  10. 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:

  11. Reliability calculation for DP thrusters (forexponentional failures distribution and generic data)

  12. 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

  13. Thank you for attention

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