PHALANX CIWS - Vibration impact on accuracy

Hello all,

I am making a project on the vibrations that take place on the PHALANX CIWS during real life engagement scenarios and how the vibrations affect dispersion (barrel tip displacement).Ultimately we suggest a better way for vibrations handling.

The PHALANX CIWS, is armed with a M61A1 Gattling gun (6 barreled). It shoots in 2 paces, slow mode (3000 Shots per minute and fast mode (4500 Shots per minute).

An initial frequency analysis has been done , and the eigenfrequencies have been estimated on both 3000 SPM and 4500 SPM. Also the gun traverses from - 25 to +85 degrees vertical (eigenmodes and eigenfrequencies have been estimated in 0, -25 and +85 angles)

Harmonic and frequency analysis must follow.

Supposing the gun rotates and fires , how should the force application be modeled to capture the rotational effect scenario ? Centrifugal force has been applied to the rotor and generally all the rotating components. The barrels fire in sequence and a recoil force has been applied to the bottom of each barrel, though I am not sure if it captures the real life behaviour.


Hi @Zaff_Zaff, thanks for posting!

Your overall approach looks good to me. I think you could run a harmonic study and apply a sinusoidal force to one of the barrel’s faces (to account for it’s rotation). Then just apply a centrifugal force to the whole rotating structure and you should be good to go.

Another alternative would be to actually rotate the barrel in a dynamic study using rotating motion and compare the results. It certainly would look very cool at least.

Cheers
Igor

Good evening !
Well actually i am trying to find out the distinctive diferencies between harmonic and dynamic simulations.
Please i would like some more explanation on the way you suggest the harmonic study should be conducted, why the force should be applied only to one of the barrels, also is there any special field/way fot the application of the sinusodial force to be done ?