Possibilities of Improving Safety and Reliability of Ship Propulsion System During Dp Operations

Herdzik, Jerzy

doi:10.5604/12314005.1137921

Cited by 4 publications

(6 citation statements)

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“…The azimuth thrusters may produce the oriented thrust in 360º around its own axis (if no sector limits). The thruster failure may be detected as non-conformity between the set and real direction of thrust [8,9]. The feedback about parameters of all thruster work is required.…”

Section: Necessity Of Thrust Control From All Thrustersmentioning

confidence: 99%

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Thrust Control Systems of Propulsion and their Verification on Dynamically Positioned Vessels

Herdzik

2019

Journal of KONES

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Thrust vector control systems of propulsion systems of dynamic positioning vessels are commonly applied on vessels with DP2 and DP3 class of DP. It was submitted the ways of providing information to dynamic positioning operator DPO about detecting of suspicion of failure in specific thruster and shown the ways of response in such situations. In the case of failure and shut down one of working thrusters, it must be done the possibility assessment of continuation of DP system safe operation. If such situation is not possible, it should be considered the work of DP system on limitations. It was indicated on safety threats during operation of DP systems resulting from system failure or even the design faults. It commonly applies the failure mode and effect analysis (FMEA or FMECA) from the design phase through sea trials until to the verification process during operation. It allows the elimination of majority of faults in the DP systems. It was communicated the basic conditions of safe operation of vessels with DP systems and the examples of conditions which releasing the readiness signal of DP propulsion system elements. Observed development of control and automatics systems will result in increasing the safety of DP systems operation.

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Section: Necessity Of Thrust Control From All Thrustersmentioning

confidence: 99%

“…It is a necessary of DP systems to the ability for self-diagnostics e.g. after occurring the determined states, alarms or parameters beyond limits the control system should inform the DP operator about the failures and what should be done for bringing back the system to healthy state [8,12]. Fig.…”

Section: Necessity Of Thrust Control From All Thrustersmentioning

confidence: 99%

Thrust Control Systems of Propulsion and their Verification on Dynamically Positioned Vessels

Herdzik

2019

Journal of KONES

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“…W sytuacji układu z dwoma pędnikami, gdy zachodzi konieczność odstawienia jednego z nich, np. w związku z nawinięciem na pędnik liny holowniczej, holownik dysponuje tylko połową dotychczasowej mocy przy znacznie ograniczonej manewrowości (jest gorsza niż w układzie z jedną śrubą), w tym przypadku bowiem jest on posadowiony niesymetrycznie w stosunku do osi głównej jednostki [Herdzik 2009].…”

Section: Kierunki Rozwojuunclassified

Analiza wybranych rozwiązań układów napędowych i urządzeń sterowych stosowanych na holownikach portowo-redowych

Marut

2018

sjgmu

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“…The thrusters are often tested one by one and all together. The total thrust is less than the sum of each of them [6,7].…”

Section: Examples Of Evaluating Criteria Of Dp Systemsmentioning

confidence: 99%

Evaluating Criteria for Dp Vessels

Herdzik

2015

Journal of KONES. Powertrain and Transport

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The paper presents the evaluating criteria for DP vessels. A few persons tried to give a simple tool for comparing the station keeping capability between different ships. It was started in the seventies when most vessels claiming to have a DP system would be carried away by the current only (the limit was 1.5 up to 2 knots). Mainly DNV and ABS, next IMO prepared the calculating methods for DP system evaluation during the design process to receive the DP class 1, 2 or 3. The regulations may help but it's still only rough estimate. One of them is the most popular. It is the capability plot presenting at preliminary the polar diagram with number envelops, showing the vessel's capability to keep position or heading with a certain combination of thrusters in operation. The number, type, total power (or thrust) and location of thrusters are vital for estimating the DP capability from the propulsion system. The other equipment is only accessories assisting the DP system. At the end the sea trial may check and confirm the DP class of the vessel. The real capability for station keeping will be verified during normal operation, essentially during emergency situations like electric network faults, propulsion system failure up to damages and fire. It is needed some indexes or parameters during the design process to avoid serious faults. The paper is a probe of becoming familiar with chosen criteria.

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Possibilities of Improving Safety and Reliability of Ship Propulsion System During Dp Operations

Cited by 4 publications

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Thrust Control Systems of Propulsion and their Verification on Dynamically Positioned Vessels

Thrust Control Systems of Propulsion and their Verification on Dynamically Positioned Vessels

Analiza wybranych rozwiązań układów napędowych i urządzeń sterowych stosowanych na holownikach portowo-redowych

Evaluating Criteria for Dp Vessels

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