Principles of naval engineering - Historic Naval Ships Association

PRINCIPLES OF NAVAL ENGINEERINGThe automated engineering plant is designedto bring togetlier in one location all of the majorcontrol functions and indications previously locatedthroughout the engineering spaces^ In addition,major advances made in the areas ofboiler control, turbine control, and plant surveillancehave also been incorporated in the controlsystems. Control systems such as the centraloperation system provide for direct control ofshaft speed and direction at a console located onthe bridge. These control systems are located inan enclosed Engineering Operation Station (EOS)located within the machinery plant.The Central Operations System (COS), shownin figure 25-12, as found in naval vessels, providesfor control of the electrical plant, the mainturbine, selected auxiliary equipment and surveillanceof the entire engineering plant. It utilizessolid state components in the analog and thedigital circuitry. Analog components are used inthe throttle control systems and in the input to theplant surveillance equipment. Throttle controlfeatures are provided by standard operationalamplifiers and functional generators used in aclosed loop system which maintains operation ata desired point.Information on plant conditions is provided bydigital demand displays, alarm indications, indicatinglights, meters and the printout typewriters.This is handled by a time sharing systemmade up of logic circuitry, and controlled bya sjmchronous timing generator.A substantial decrease in the number of watchstanders required to operate the engineering installationcan be achieved through the use of asystem of this type. The bridge throttle controlfeature provides the OOD with a greater feel ofthe ship as well as a faster response to desiredchanges.ENGINE ROOM CONSOLEThe engine room console (fig. 25-13) is theheart of the central operations system (COS) andis divided into five functional sections, generators,propulsion, boilers, auxiliaries, anddata logger. The desk top of the console housesthe controls and devices required to be within theoperator's reach. The vertical surface above thedesk top is used primarily for instrument displayand visual indicators. Solid state control moduleswith printed circut elements are used which canBLOCKDIAGRAMPROPULSIONPLANTCONTROL. INFORMATION" DISPLAYSENSORS. MONITOR'^ a ALARM TEMP PRESSURE. PROGRAM ^" CONTROLS""^ACTUATORSSUB-LOOPCONTROLS1-^LEVELDATAMOTOR VALVE^ LOGGERFigure 25-12.— Central operations system major units.27.344640