Sahveihev J Bentkowsky and Kerr 



REDUCTION AND PRESENTATION OF DATA 



The proximity effects are described by a time independent 

 term and a time varying term in each of the six equations of motion. 

 These components are functionally dependent on the proximity to the 

 distressed submarine, Zd, the DSRV attitude angle, 9rv; and the 

 orientation of the distressed submarine relative to the current. By 

 means of the tests conducted in the Ames facility, these effects 

 were determined primarily for two orientations of the submarine to 

 the current: head-on and athwartships. The tests were conducted 

 with the DSRV mating at both the forward and aft hatches with 

 various attitude angles of the DSRV and roll angles of the distressed 

 submarine. The DSRV yaw angle was zero for all test conditions. 



Time Independent Interaction Forces 



At the Ames facility the balance data were recorded by 

 printing devices, punched onto paper tape by a Beckman 210 com- 

 puter, and carried to the laboratory's computing center. The 

 resultant steady-state force and moment coefficients were computed 

 at the Ames center in the body-axis system. The force coefficients 

 were non-dimensionalized by the DSRV's maximum cross sectional 

 area; the moment reference arm for moment coefficients was the 

 maximum diameter of the DSRV, 



In order to determine the DSRV characteristics in free 

 stream, the submarine model was removed from the tunnel, and 

 the forces on the DSRV were determined through an angle of attack 

 (pitch angles) range from - 12«5 to + 35.0 degrees. The resulting 

 normal force, pitching moment, and axial force coefficients versus 

 angle of attack are shown in Fig. 18, These results are shown to 

 correlate well with previous free stream tests conducted at Hydro- 

 nautics. Inc. (Ref, 5), 



Interaction coefficients were determined by plotting the 

 measured data and extrapolating the curves to the free stream con- 

 ditions , 



The interaction coefficients are: 



Cv (-C. ), C^ , C^ (- C^,) Force Coefficients 



Xi A; Ij L\ INI 



C , C , C., Moment Coefficients 



I I 



where 



TV " 9m 



Cz. = Cz. +k \:^'* ', etc. 



1158 



