Concepts in Submarine Design (Cambridge Ocean Technology Series) by Roy Burcher & Louis J. Rydill

Author:Roy Burcher & Louis J. Rydill [Burcher, Roy]
Language: eng
Format: epub
Publisher: Cambridge University Press
Published: 1994-01-27T22:00:00+00:00

Fig. 7.6 Battery Stowage

Right at the after end will be a shaft mounted electric motor, main actuator rams for rudders and hydroplanes and the after trim tank. This compartment may also form the alternative escape compartment in the event of flooding forward.

7.13 Similar but different arrangements apply to a conventional submarine. Again the propulsion plant occupies almost half the hull. The main diesel generators usually occupy the first compartment aft of amidships, which is a relatively dense compartment needing to be close to midlength. The diesels also require to be fairly close to the rear of the bridge fin to reduce the run of exhaust and induction piping to the snort mast.

If, as is usually the case, direct drive is not catered for as a propulsion option the diesels and their electrical generators are not required to align to the propulsion shafting, which gives some freedom in arrangement both vertically and horizontally. It should be remembered, however, that if the diesel generators were sited at the sides of the hull there would be less available headroom due to the overhead curve of the hull. Whilst many submarines now make provision for a large section of the hull to be removed to conduct major overhauls on engines, many maintenance tasks will still be conducted in enclosed conditions with a relatively small access hatch for men and equipment. Thus, at the detail design stage, attention has to be given to access and readiness of removal of many parts of the machinery which may require repair or replacement.

Aft of the main diesel generator compartment will be the main electrical switchboard. Though the electrical distribution demands of a conventional submarine are necessarily less than those of a nuclear vessel there is nevertheless a major requirement for the switching of the high voltage direct current associated with the electrical propulsion system.

The aftermost compartment is dominated by the propulsion motors, control surface actuators and after trim tank, and so can be a very congested space particularly if after torpedo tubes are fitted (though stem tubes have rarely been adopted in modem submarine designs).

Aft of the pressure hull the outer form is narrowing rapidly towards the propulsor. Within this space, however, some form of after MBT has to be accommodated. Furthermore, the main drive shaft has to be taken through from the pressure hull shaft seal to the propulsor hub. There is also a requirement for rudders and hydroplanes at the tail. Because the shafts of the control surfaces would otherwise intersect the propulsor shaft line at right angles, they have to be split and displaced to either side of the drive shaft by massive yoke arrangements. The yokes also act as the levers for actuation of the control surfaces by push rods from internally stowed hydraulic rams. It will be appreciated that these multiple demands on a very cramped space necessitate careful detailed design to avoid interference and achieve workable and maintainable arrangements.

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