LIST OF FIGURES 



Page 



Figure 1 - Schematic Diagram of a Hydrophone Array 3 



Figure 2 - Karman Vortex Trail 3 



Figure 3 - Sketch of Hydrophones Used in Basin Tests 5 



Figure 4 - Towing Configuration Used in Basin Tests 5 



Figure 5 - Diagram of Towing Configuration Used in Open-Water 6 



Tests 



Figure 6 - Instrument Housing and Fairing Assembly 7 



Figure 7 - Fairing and Hydrophone Assembly Used in Acoustic 7 



Tests 



Figure 8 - Diagram of an Experimental Directivity Hydrophone 9 



System 



Figure 9 - Diagram of the Modified Experimental Directivity 9 



Hydrophone System 



Figure 10 - A Comparison of the Relative Noise Levels 10 



Received from an AX-58 Hydrophone Tested 

 in the Basin under Various Conditions 



Figure 11 - Comparison of Computed and Actual Configuration 13 



of the Experimental Array Used in Open-Water 

 Tests 



Figure 12 - Strouhal Number as a Function of Reynolds 15 



Number 



Figure 13 - Comparison of Computed and Experimental 15 



Frequencies for System Used in Open-Water 

 Tests 



Figure 14 - Comparison of Measured and Computed Cable 16 



Configurations for the Experimental Directivity 

 Array 



