Vehicle Dynamics Associated with Submarine Rescue 



-DSRV 



2.4r 



SUB >= 0" -0.8- ^ 



-1.6L 



l;^ 10 20 30 40 ^O-" "Jo 70 



\ 



^ VK: 



Z^ IN FEET 



10 20 30 40 50 60 70 

 Z^ IN FEET 



2.4r 



1.6 - 



0.8 - 



\ 10^^ 20 30 40 50 60 70 

 0.4 L ^ Zr. IN FEET 



10 20 30 40 50 60 70 

 Zn IN FEET 



Fig. 20. Time Independent Flow Interaction Forces -- DSRV Mating 

 Normal to Submarine Centerline 



Although the DSRV was heading athwartships directly into the 

 current for this series, it is shown in Fig. 20 that lateral forces 

 were applied to the vehicle, i.e. , Cy , C^. , and Qj were not equal 

 to zero. This result is due to the fact that a cross flow results when 

 the current is deflected off the sail and the DSRV is therefore not 

 heading directly into the resultant flow. The magnitude of the side 

 force, Fgjde , in a 1 knot current is 300 lbs. 



Tim e Dependent Forces 



During the test program, the outputs of the six-component 

 balance (i.e. , normal and lateral forward and aft gauges and the roll 

 and axial-force channels) were recorded over a five minute interval. 

 The long recording time was established to provide a high confidence 

 level during analysis of the unsteady effects (Ref. 13). 



The information was digitized by data conversion and input to 

 an IBM 7094 force and moment conversion program. The output of 

 the 7094 program was then used as input for an existing LMSC Power- 

 Spectral Density Computer Program. 



1161 



