本文对截面具有两个不相等主惯性矩的海洋石油立管的三向大位移分析作了理论推导。
A formulation to analyse the large displacement problem of a Marine riser with two unequal principal moments of inertia of the cross section in the 3-d space is presented.
第三节研究地球主惯性轴方向的确定方法，第四节给出地球主惯性矩、主惯性轴方向和地球扁率的数值结果。
Section 3 studies the directions of the Earths principal axes of inertia, and Section 4 presents the num.
依据平板抗弯刚度公式，提出等效惯性矩的思想，构造了波纹厚板新的第二主向刚度公式。
According to bending stiffness formula of the flat plate, the idea of equivalent inertia moment is proposed, which constitutes a new second main stiffness formula for corrugated plate.
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