Johnsson and Stfntvedt 



S peed, Number of Revs and Sea State 



Most of the tests were carried out in connection with the speed 

 trials but not at the runs on the measured mile. The speeds for the 

 tests reported here were recorded with the log of the ship, which is 

 not a very accurate method. Accurate registration of the number of 

 revs was, however, carried out in connection with all measurements 

 by using a photoelectric cell, mounted on the shaft. Most of the re- 

 sults in this paper are therefore related to number of revs instead of 

 speed. 



In the table below the sea state during various tests is present- 



ed. 



Sea State during Trials 



Vibratory Response in the Structure of the Ship 



Vibratory response was registered at about 20 points in the 

 structure (wing tank), engine room and deck house with the use of 

 velocity transducers manufactured by CEC. The positions of these 

 transducers, which were fitted at least at two of the trials, are 

 shown in Figure 1. The fins, when installed were fitted with accele- 

 rometers, positioned in the vicinity of the pressure transducers, see 

 below. 



586 



