Analysis Used in Submerged Body Research 425 
INSTRUMENTS 
7 
SUBMARINE -7 SUBMARINE 
4 
CONTROL | “CYCLE ——o 
7 
ie 
OPERATOR Z 
CONTROLS 
(a) Submarine control cycle 
we INSTRUMENTS \ 
DIVING STATION 
SUBMARINE TILT. TABLE 
SIMULATOR [2 a) 
CONTROL CYCLE aN 
OPERATOR 
> 
S 
ANALOG COMPUTER 
(b) Simulator control cycle 
Fig. 35. Comparison between submarine control cycle and simulator control cycle 
Fig. 36. DTMB analog computer facility 
numerical measures of control effectiveness, such as time to reach execute, overshoot angle 
in the vertical plane, and overshoot depth in the vertical plane. A similar maneuver, such 
as shown in Fig. 42, can be used to define the ability to initiate and check a course change 
in the horizontal plane. The results of the Dieudonne spiral maneuver shown in Fig. 41 pro- 
vides some measure of the inherent dynamic stability in the horizontal plane. These results 
are also indicative of the course-keeping characteristics of the submarine. Steady-turn 
studies such as shown in Fig. 43 provide numerical measures such as tactical diameter, ad- 
vance, transfer, time to change heading 90 to 180 degrees, and loss of speed in the turn. 
