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Figure 6 — Spectral Analysis of Waves Produced with Actuator 

 Installation to Simulate Neumann Spectrum with 

 Peak Frequency of 0.65 CPS 



Figure 7 — Neumann Spectrum Normalized with Respect to 



Frequency and Amplitude of Peak 10 



Figure 8 — Frequency Response of Linear System Synthesized 

 on Analog Computer in Order to Insert Frequency 

 Weighting of Neumann Spectrum with Peak 

 Frequency of 0.3 CPS H 



Figure 9 — Frequency Response of Linear System Synthesized on 

 Analog Computer in Order to Remove Measured 

 Frequency Response Characteristics of 

 Wavemaking System 11 



Figure 10 — Analog Computer Configuration Used to Insert Proper 

 Spectral Characteristics into Wavemaker Excitation 

 Signal 13 



Figure 11 - Spectral Analysis of Signal from White Noise 



Generator with 30-Minute Recording Time 14 



Figure 12 — Spectral Analysis of Waves Produced with Actuator 

 Installation to Simulate Neumann Spectrum with 

 Peak Frequency of 0.5 CPS 15 



Figure 13 - Change in Wave Spectral Shape Because of 50-Percent 

 Reduction of Excitation Level of Actuators Using 

 Input Program with Flat Frequency Characteristics 15 



Figure 14 — Change in Wave Spectral Shape Because of 20-Percent 

 Reduction in Air Blower Speed Using Input Program 

 with Flat Frequency Characteristics 16 



Figure 15 - Change in Wave Spectral Shape as a Function of 

 Location in the Test Basin Using Input Program 

 with Flat Frequency Characteristics 16 



Figure 16 — Relation among Peak Frequency of Neumann Spectrum, 

 RMS Wave Height, Model Scale Ratio A., and Sea State 

 for Simulated Long-Crested Seaways in the Test Basin 18 



