























yv 



















/ ^ 













RMS' 2.34" 







^,„^^ 













RMS- 1.70" 

 \ 





\ \ 

 I \ 

 \ \ 

 » \ 

 \ \ 

 \ \ 











V 



















^ / 









\ 



\ 

















\ 



\ 









/ \ / 









\ 



\, 









/ ^-' 









\ 



\ 









/ 

 / 











. \ 











BLOWER SPEED - 1 100 RPM 





V \ 



N 









PROGRAM AMPLIT 



UDE ■ 877 







'-\\ 





















I 





0.6 0.7 OS 0.9 



FREQUENCY IN CPS 



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



Reduction in Air Blower Speed Using Input Program 



with Flat Frequency Characteristics 





























































Ol/ 



\ 















RMS = 2.34'-, 



^/tx. 



v\ 















/ y 



J 



^L 













RMS-2.47:i^ 



/ p^ 



1 / 



\ 



"^ 











y 



'^y 



w 



V 



\ 











-y^ 









\ 

 \ 



\ 

 \ 











/^ 



















yf 



PROBE 



80 FT. FROM Wfl 

 GO FT. FROM W* 



VEMAKERS 





\ \ 









y' 1 



















PROBE 



VEMAKERS 





^^ 









1 



PROGRAM AMPLIT 



J DE. 0.877 







\ \ 



\ 







/ 



BLOWER SPEED- 



400 RPM 







\ 



A 







/ 













x\ 



















\ 



^ 























FREQUENCY IN CPS 



Figure 15 — Change in Wave Spectral Shape as a Function of Location 

 in the Test Basin Using Input Program with 

 Flat Frequency Characteristics 



16 



