Johnsson and Stfntvedt 



section A-A 



tronsducgr for m rcs'.'ring pressure^ 

 fluctuations on the h'j'.l 



_ru- 



pressure wave transmitter 

 Figure 1 Afterbody model in tunnel test section 



iron tube 



S S5Sa i t$£SS SI press ur e tran sduce r for 

 ;S,-^ — L_, ~-Jx measuring volume oscillation 



z s - 



^ 



Si 



WZZZZ ZZ Z ZZZ2A 



i i 



Figure 2 Pressure wave transmitter 



668 



