the natural frequency of a system coincides with the external forcing system frequency the phenomenon is called resonance. The speed at which resonance occurs is known as critical speeds. These speeds are also called whirling speeds or whipping. Supported end conditions: Make use of end blocks with single self-aligning bearing. Fixed end conditions: -Make use of end blocks with double bearing. The guards D1 & D2 can be fixed at any position on the supporting bar frame, which fits on side support F. Rotating shafts are to be fitted in blocks in A &B stands.
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