پدیده بازگشت فنری - ویکی‌پدیا، دانشنامهٔ آزاد

${\displaystyle (R_{i}+{\frac {T}{2}})\alpha _{i}=(R_{f}+{\frac {T}{2}})\alpha _{f}}$

${\displaystyle \textstyle K_{s}={\cfrac {\alpha _{f}}{\alpha _{i}}}={\cfrac {{\cfrac {2R_{i}}{T}}+1}{{\cfrac {2R_{f}}{T}}+1}}}$

${\displaystyle SB\%=(1-K_{s})*100}$

${\displaystyle {\frac {R_{i}}{R_{f}}}=4({\frac {R_{i}Y}{ET}})^{3}-3({\frac {R_{i}Y}{ET}})+1}$

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