This paper gives an an illustrational proof to beam intensity distribution for narrow beam of rectangularcrosssection, and presents an accurate expression to calculating beam intensity.
本文对截面为矩形的窄束给出束强分布的图解法证明，并提出计算束强的精确公式。
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The dynamic response of a free free beam with uniform rectangularcrosssection subjected to impact by a mass at both free end is analyzed theoretically.