Dear colleagues!
I am interested in the process of transferring vibrations up to 250 mm from a stationary electro-mechanical vibrator to a rotating toroidal metal shell.
Respectfully,
Sumy State University
Sklabinskyi Vsevolod Ivanovich
Doctor of Engineering Sciences, Professor
Head of the Faculty
“Of Processes and Equipment for Cremical
and Oil Refinig Industries”
Ukraine
Please give more information about the system. What frequencies are used? How much power is there available to transfer the vibration? In what axis is the rotating shell to be vibrated relative to the vibrator itself?
Additional Information:
Frequency - 400 hertz;
Vibrations of the metal rod occur along the vertical axis (the rod does not rotate, but only vibrates along the axis);
Around this axis, the shell rotates;
The maximum diameter of the shell is 500 mm;
Rotation speed 250 rpm;
The power of the vibrator is not more than 500 watts.
Sincerely, Vsevolod Sklabinskyш
Vsevolod - you need an extremely rigid rotary joint, with a natural resonance frequency well above 400 Hz. Start by looking for a small thrust bearing to fit to the rod. (you may need two, one for each direction). A ball bearing may not be capable of standing high axial stress and might have mechanical hysteresis. Then you will have to attach the outside thrust race(s) (that's the external part of the bearing) to an extremely rigid set of rods fastened to your shell. I suggest carbon fibre, arranged in triangles for rigidity. Put an accelerometer on the shell, and plot the frequency response before carrying out your experiment. You MUST aim for a 3 db cut off of at least 2000 Hz between electronic drive and accelerometer output to make sure the system is well behaved at 400 Hz.
Thanks. But we already tried to apply similar designs. They are short-lived. In addition, such designs introduce additional disturbances into the oscillation process.
We are interested in the option when a magnetic element is attached to a rotating shell, and electromagnetic disturbances act on it.
Sincerely, Vsevolod Sklabinskyi
I would agree with you - the mechanical stresses will be very high. I don't know the mass of your ring - but maybe you could make another ring of higher mass and connect it to the first ring using a 'giant magnetostrictive' device made from, for example, Terfenol-D. Subjecting the Terfenol to a strong 400 Hz magnetic field will make it change shape and vibrate the ring, using the inertia of the second high mass ring, in the way you are looking for?
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