Lecture 14 
Lecture 15 
13.2 The Measurement of Ambient Noise 
13.3 Factors That Determine the Equivalent Noise 
Pressure, Free-Field Voltage Response, 
and Efficiency of a Transducer at Low 
Frequencies 
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13.3.1 The Equivalent Circuit and the 
Efficiency 
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13.3.2 The Free-Field Voltage Response 
and Equivalent Noise Pressure.......... 
FLOW NOISE, THEORY AND EXPERIMENT 
E. J. Skudrzyk and G. P. Haddle ........ 
14.1 Introduction 
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14,2 The Nearfield Flow Noise Conertaed by a 
Turbulent Boundary Layer 
14.3 The Radiated Flow Noise ....... 
14.4 Effect of Size and Shape of Sound Receiver 
on Amplitude-vs-Frequency Curve of 
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14.5 Noise Generated by the Surface Roughnesses ..... 
14.6 Experimental Results. 
14.7 Radiated Pressure and Shell Vibration weve 9 o0!0-0 
14.8 Effect of Size and Shape of Hydrophone on 
the Received Noise Level ....... 
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14.10 The Reproducibility of the Measurements 
and the Effect of Shell Vibrations on the Result... 
SOME CONTRIBUTIONS FROM AERONAUTICS TO THE 
FIELD OF UNDERWATER NOISE 
E. J. Richards, J. L. Willis, and D. J. M. Williams ........ 
15.1 Introduction 
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15.2 Boundary-Layer Pressure Fluctuations......... 
15.2.1 The Radiated Sound from a Small 
Flat Plate 
15.3 Structural Response and Reradiation 
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15.4 Applications to Underwater Noise Problems...... 
15.4.1 Radiated Noise 
15.4.3 Turbulent Boundary-Layer Wall 
Pressure Noise 
15.4.4 Noise from Roughness..... 
15.4.5 Reradiated Noise from Body Vibrations . 
15.4.6 Self-Noise 
15.5 Conclusion 
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