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CRITICAL SPEED CALCULATION
Thr RPM which numericlly concide with the natural frequency of transverse Vibration of the shaft is Known as critical speed .
Critical speed is a function of mass of rotating component and Stiffness of its material . F=stiffness of rotating component
m=mass of the same
The speed at which harmonic vibrations of the machine will rip it apart. Every rotating machine has multiple points at which vibrations occur, the speed at which all of these vibrations reach maximum vibration is the critical speed. Two or more vibrations can reach maximum at the same time, this is called harmonic vibration.
Example: A pump which has a bearing that vibrates at 400 rpm, an impeller that vibrates at 600 rpm, and a second bearing that vibrates at 800 rpm will have harmonic vibrations at 800 rpm, 1200 rpm, 1600 rpm and so on. It will reach critical speed at 2400 rpm, and again at 4800 rpm...etc. when all three vibrations reach maximum.
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What is the limitation of science and technology?
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How do you you make a rubber band powered boat?
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