TABLE OF CONTENTS 



Page 



ABSTRACT 1 



INTRODUCTION 1 



DESCRIPTION OF THE WAVEMAKING FAQLITIES 1 



DESIRED CHARACTERISTICS OF A SIMULATED SEAWAY 2 



BASIC APPROACH 4 



OUTLINE OF RESULTS 6 



ANALOG PROGRAMMING TECHNIQUES 6 



Synthesis of a Neumann Spectral Shape 9 



Synthesis of Inverse Wavemaker Characteristics 10 



DIFFICULTIES ENCOUNTERED IN WAVE GENERATION 12 



SUMMARY OF INFORMATION GAINED FROM SPECTRAL PROGRAMMING 17 



FUTURE DEVELOPMENT 17 



Generation of a Family of Uaidirectional Spectra 17 



Approach to the Generation of Directional Spectra 18 



ACKNOWLEDGMENTS 19 



REFERENCES 19 



LIST OF FIGURES 



Figure 1 - Hydraulic Actuator Used to Control Flow of Air to 



Wavemaker Dome 3 



Figure 2 - Frequency Response of Actuator Wavemaking System as 



Determined from Sinusoidal Excitation 5 



Figure 3 - Irregular Long-Crested Waves Produced by HydrauLically 



Controlled Wavemakers 7 



Figure 4 - Typical Wave-Height Recording of Neumann Spectral 



Simulation with Peak Frequency at 0.3 CPS 8 



Figure 5 - Spectral Analysis of Waves Produced with Actuator 

 Installation to Simulate Neumann Spectrum with 

 Peak Frequency of 0.3 CPS 8 



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