Based on the modal analysis with approximately finite modes, the numerical analysis and simulation are carried out and show the evident control results of suppressing the bending and torsional vibrations. 在有限维近似模态分析基础上进行数值分析与模拟,得到系统弯曲振动、扭转振动的抑振控制效果曲线图。
The dynamic model of the active magnetic bearings was built firstly, and then a saturation function to substitute for the sign function in the controller was used based on Lyapunov theory to approximately realize infinite gain with finite gain. 通过建立电磁轴承动力学模型,基于李亚普诺夫稳定性理论,用饱和函数取代常规变结构控制的符号函数,以有限大的增益近似实现无穷大的增益;
Several particular situations in which the rate-form elastic constitutive laws can be approximately applied to the case of finite deformation are discussed. 文中还讨论了几种弹性本构律可以近似用于大变形描述的情况。
In the analysis, although it is assumed that the concrete is connected directly with the adjacent steel, the slip between both materials can be found approximately from the results of the finite element analysis. 虽然在本文的有限元分析中假定混凝土与钢筋直接连接,但两种材料之间的滑移仍可以按本文方法由有限元的计算结果近似求得。
The three-dimensional geometric models of the breaking waves are approximately simulated with the dihedral wedge with finite size. According to the breaking criteria of the sea waves, the distribution of the breakers is obtained, which is also compared with the measured data and empirical formulas. 采用有限大二面角劈结构来近似模拟碎浪三维几何模型,根据波浪破碎判据得到碎浪在二维海面上的空间分布并与实测及经验公式比较。