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Originally Posted by Dr.Sid
If you only change pitch, noise should be louder, but it will be modulated by higher frequency (by shaft rotation with its harmonisc). Whole my post was about INTENSITY of the sound, not modualating frequency. Frequency is clearly shaft rotation speed.
But in DW demon is not shaft realated. It depends on speed alone. Which is incorect, of course. Whole DEMON is not correctly modeled at all. Whole idea that number of lines corresponds to number of blades is wrong. There was some posts about DEMON which linked to some good IRL info. Try some searching in thread titles (look for DEMON).
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thanks,dr.sid. i've understood about demon, but also the noise showed by
towed array is wrong, because if change only pitch and speed increases, the noise remain the same...so it appears that changing pitch i can obtain higher speed without cavitating and this is wrong, or not?