通过和单自由度线性弹簧-质量-阻尼系统进行比较，得到该带裂缝梁结构的等效自然频率和等效粘滞阻尼比。
The equivalent viscous damping ratio and the equivalent natural frequency are obtained by comparing the system with a purely linear, spring-mass-damper system of single freedom.
这种构造地难度在于节制器地设计，由于自然地低阻尼惹起振动。
The difficulty of such a structure lies in the controller design because of the natural low damping which induced oscillations.
利用自然水平函数，将众所周知的阻尼牛顿法进行推广，用于求解病态非线性方程组。
By using the so-called "natural level functions", we extend the well-known damped Newton method to solve ill-conditioned systems of nonlinear equations.
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