PRINCIPLES OF NAVAL ENGINEERING 



The automated engineering plant is designed 

 to bring togetlier in one location all of the major 

 control functions and indications previously lo- 

 cated throughout the engineering spaces^ In ad- 

 dition, major advances made in the areas of 

 boiler control, turbine control, and plant surveil- 

 lance have also been incorporated in the control 

 systems. Control systems such as the central 

 operation system provide for direct control of 

 shaft speed and direction at a console located on 

 the bridge. These control systems are located in 

 an enclosed Engineering Operation Station (EOS) 

 located within the machinery plant. 



The Central Operations System (COS), shown 

 in figure 25-12, as found in naval vessels, pro- 

 vides for control of the electrical plant, the main 

 turbine, selected auxiliary equipment and sur- 

 veillance of the entire engineering plant. It uti- 

 lizes solid state components in the analog and the 

 digital circuitry. Analog components are used in 

 the throttle control systems and in the input to the 

 plant surveillance equipment. Throttle control 

 features are provided by standard operational 

 amplifiers and functional generators used in a 

 closed loop system which maintains operation at 

 a desired point. 



Information on plant conditions is provided by 

 digital demand displays, alarm indications, in- 

 dicating lights, meters and the printout type- 

 writers. This is handled by a time sharing sys- 

 tem made up of logic circuitry, and controlled by 

 a sjmchronous timing generator. 



A substantial decrease in the number of watch 

 standers required to operate the engineering in- 

 stallation can be achieved through the use of a 

 system of this type. The bridge throttle control 

 feature provides the OOD with a greater feel of 

 the ship as well as a faster response to desired 

 changes. 



ENGINE ROOM CONSOLE 



The engine room console (fig. 25-13) is the 

 heart of the central operations system (COS) and 

 is divided into five functional sections, gen- 

 erators, propulsion, boilers, auxiliaries, and 

 data logger. The desk top of the console houses 

 the controls and devices required to be within the 

 operator's reach. The vertical surface above the 

 desk top is used primarily for instrument display 

 and visual indicators. Solid state control modules 

 with printed circut elements are used which can 



BLOCK DIAGRAM 



PROPULSION 



PLANT 



CONTROL 



SENSORS 



. INFORMATION 

 " DISPLAY 



. MONITOR 

 '^ a ALARM 



TEMP PRESSURE 



. PROGRAM ^ 

 " CONTROLS ""^ 



LEVEL 

 ACTUATORS 



SUB-LOOP 

 CONTROLS 



1-^ 



DATA 

 ^ LOGGER 



MOTOR 



VALVE 



27.344 



Figure 25-12.— Central operations system major units. 



640 



