( : ) روشی است که برای تعیین سرعت بحرانی یک سیستم شافت دوار به کار می‌رود.
 	
 where: 
E = Young's modulus,
I = ,
m = mass of the shaft,
L = length of the shaft between points.
 A shaft with weights added will have an angular velocity of N (RPM) equivalent as follows:
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