Combined diesel-electric and gas (CODLAG) is a modification of the combined diesel and gas propulsion system for ships. A variant, called the combined diesel-electric or gas (CODLOG) system, contains the same basic elements but will not allow simultaneous use of the alternative drive sources.[1]
Principle of a CODLAG propulsion system
A CODLAG system employs electric motors which are connected to the propeller shafts (usually 2). The motors are powered by diesel generators. For higher speeds, a gas turbine powers the shafts via a cross-connecting gearbox; for cruise speed, the drive train of the turbine is disengaged with clutches.
This arrangement combines the diesel engines used for propulsion and for electric power generation, greatly reducing service cost, since it reduces the number of different diesel engines and electric motors, requiring considerably less maintenance. Also, electric motors work efficiently over a wide speed range, and can be connected directly to the propeller shaft so that simpler gearboxes can be used to combine the mechanical output of turbine and diesel-electric systems.
Another advantage of the diesel-electric transmission is that without the need of a mechanical connection, the diesel generators can be decoupled acoustically from the hull of the ship, making it less noisy. This has been used extensively by military submarines but surface naval vessels like anti-submarine vessels will benefit as well.
Integrated electric propulsion in the Type 45 destroyer (GT: gas turbine; DG: diesel generator)
A system which uses both diesel engines and gas turbines to generate electricity for electric motors, where there is no mechanical transmission from either to the propellers, is not classified as CODLAG, but as integrated electric propulsion (IEP) or integrated full electric propulsion (IFEP). Such an arrangement is in use on passenger ships like RMS Queen Mary 2, with a pool of diesel generators for the base load and turbo generators for peak power, and on warships such as the Royal Navy's Type 45 destroyer and the Zumwalt-classdestroyer (DDG-1000/DD(X)).
^"Q&A with BAE Systems on Type 26 Frigate Design Update at Euronaval 2012". Belgium: navyrecognition.com. 10 January 2013. Retrieved 19 March 2013.
October 28, 2023
combined, diesel, electric, combinedmarinepropulsioncodogcodagcodladcodlagcodadcosagcogogcogagcogasconasiep, ifepcombined, diesel, electric, codlag, modification, combined, diesel, propulsion, system, ships, variant, called, combined, diesel, electric, codlog,. CombinedmarinepropulsionCODOGCODAGCODLADCODLAGCODADCOSAGCOGOGCOGAGCOGASCONASIEP or IFEPCombined diesel electric and gas CODLAG is a modification of the combined diesel and gas propulsion system for ships A variant called the combined diesel electric or gas CODLOG system contains the same basic elements but will not allow simultaneous use of the alternative drive sources 1 Principle of a CODLAG propulsion systemA CODLAG system employs electric motors which are connected to the propeller shafts usually 2 The motors are powered by diesel generators For higher speeds a gas turbine powers the shafts via a cross connecting gearbox for cruise speed the drive train of the turbine is disengaged with clutches This arrangement combines the diesel engines used for propulsion and for electric power generation greatly reducing service cost since it reduces the number of different diesel engines and electric motors requiring considerably less maintenance Also electric motors work efficiently over a wide speed range and can be connected directly to the propeller shaft so that simpler gearboxes can be used to combine the mechanical output of turbine and diesel electric systems Another advantage of the diesel electric transmission is that without the need of a mechanical connection the diesel generators can be decoupled acoustically from the hull of the ship making it less noisy This has been used extensively by military submarines but surface naval vessels like anti submarine vessels will benefit as well Contents 1 Integrated electric propulsion IEP 2 List of CODLAG ships 3 List of CODLOG ships 4 List of IEP ships 5 See also 6 ReferencesIntegrated electric propulsion IEP editMain article Integrated electric propulsion nbsp Integrated electric propulsion in the Type 45 destroyer GT gas turbine DG diesel generator A system which uses both diesel engines and gas turbines to generate electricity for electric motors where there is no mechanical transmission from either to the propellers is not classified as CODLAG but as integrated electric propulsion IEP or integrated full electric propulsion IFEP Such an arrangement is in use on passenger ships like RMS Queen Mary 2 with a pool of diesel generators for the base load and turbo generators for peak power and on warships such as the Royal Navy s Type 45 destroyer and the Zumwalt class destroyer DDG 1000 DD X List of CODLAG ships editType 23 frigate Royal Navy FREMM multipurpose frigate Italian Navy F125 class frigate German Navy Pohjanmaa class corvette Finnish Navy Constellation class frigate United States Navy GTS Finnjet Finnish cruiseferry List of CODLOG ships editPolar class icebreaker United States Coast Guard FREMM multipurpose frigate French Navy Daegu class frigate ROKN Type 26 frigate Royal Navy under construction List of IEP ships editRMS Queen Mary 2 Wave class tanker Royal Fleet Auxiliary USNS Lewis and Clark T AKE 1 US Sealift Command Albion class landing platform dock Royal Navy Type 45 destroyer Royal Navy Queen Elizabeth class aircraft carrier Royal Navy Zumwalt class destroyer US Navy See also editDiesel electricReferences edit Q amp A with BAE Systems on Type 26 Frigate Design Update at Euronaval 2012 Belgium navyrecognition com 10 January 2013 Retrieved 19 March 2013 Retrieved from https en wikipedia org w index php title Combined diesel electric and gas amp oldid 1150863947, wikipedia, wiki, book, books, library,
