progressive loading是什么意思

用法例句

In this paper, to begin with, the nonlinear differential equations of a truncated shallow spherical shell with variable thickness under uniformly distributed load are linearized by step-by-step loading method.

本文首先应用逐步加载法将具有硬中心的开顶扁球壳在均布载荷作用下的非线性微分方程组线性化，然后利用样条配点法解线性微分方程组，得到了临界载荷的数值。

The Proof of the Principle of Inequality Gradual Adjustment;

证明不等式的逐步调整原理