Abstract
Membrane stresses alter the dynamic behavior and stability of circular-disk elements, such as circular saws and grinding wheels, by shifting the disk's natural frequency spectrum. Such shifts are directly related to variation in the critical rotation speed at which standing-wave-resonance instability occurs. Negative critical-speed variations reduce the disk stability, and positive critical-speed variations increase stability.
The present paper theoretically and experimentally investigates the relationship between the state of disk-membrane stress, critical rotation speed, and the frequency spectrum in radially symmetric disk problems. The observed critical-speed variations are theoretically predictable and well understood. The approach of a shifting critical-speed instability can be predicted by monitoring the disk-frequency spectrum.
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Abbreviations
- a :
-
clamping radius
- a :
-
a/b normalized clamping radius
- b :
-
peripheral radius
- c :
-
Initial-stress radius at which the plate is compressed between rollers at gage pressure, P
- c :
-
c/d normalized initial-stress radius
- \(\tilde H\) :
-
1/2 disk thickness
- n :
-
number of nodal diameters
- P :
-
gage pressure applied to initial stressing rollers
- ωo :
-
rotation speed
- Ωc :
-
critical rotation speed
References
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Mote, C.D., Nieh, L.T. Control of circular-disk stability with membrane stresses. Experimental Mechanics 11, 490–498 (1971). https://doi.org/10.1007/BF02327688
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DOI: https://doi.org/10.1007/BF02327688