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The dissertation presents a mathematical modeling approach for the high-speed flexible linkage mechanisms equipped with bonded piezoelectric sensing/actuating elements employing a mixed variational approach with Hamilton's principle in conjunction with the finite element formulation. This model includes both the terms coupling the elastic and rigid-body motions of linkage mechanisms and the terms coupling the elastodynamics and piezoelectricity of the elements, incorporating their effects upon the mass and stiffness matrices which are in general non-symmetric.

本文以国家自然科学基金资助项目《弹性连杆机构有害振动的主、被动控制及混合控制研究》（资助号：59605001）和广东省自然科学基金项目《开链及闭链机构有害振动控制研究》（资助号：970381）为依托，对高速弹性连杆机构振动的主动控制中的建模、求解、控制律的选择、作动/传感元件的优化以及实验研究等几个关键问题进行了比较深入细致的研究，取得了一些具有重要理论意义和重大实际应用价值的成果。

The alternative method of electrotherapy is said to excite cold and tired nerves, relieve pain and stiffness.

替代方法是电疗说惊险刺激寒冷和疲倦的神经，减轻疼痛和僵硬。

Taking into account the non-linearity of concrete and the effect of partial steel encasement on pile stiffness at various levels."

您翻译成了"同时用来处理非线形混凝土以及不同等级和规格桩上的零碎的钢套的影响。"？？？相信自己，挑战自我

The mass matrix and the stiffness matrix of the elements are derived with energy method.

不必要的振动和噪声会降低结构的使用性能并污染环境，因此，结构的减振降噪问题一直是一个十分重要的课题。

In Chapter 5, a scheme of the equilibrium iteration with a constant stiffness matrix is constructed by means of Steffensen's acceleration in the fixed-point iteration.

在第五章，我们利用不动点迭代的Steffensen加速方法构造了一个基于常刚度的平衡迭代格式。

A equivalent layer stiffness matrix which represents the information of the whole infinite domain is derived.

特别是对电磁开域问题和波导传输问题提出了一些新的有限元处理方法。

In the respect of pseudo dynamic test, the author explained the influencing factors of initial inputting stiffness matrix and the equivalent method of mass matrix of model.

在拟动力试验方面，指出了联机试验中初始刚度矩阵的影响因素，建立了模型质量矩阵的等效方法。

The finite element stiffness matrix of the equivalent beam or pipe of the cracked leg of the platform is derived using the finite element method.

采用有限元分析方法和断裂力学方法，将含裂纹构件的裂纹段以线弹簧处理，建立了带有裂纹损伤桩腿的等效梁和管单元的单元刚度矩阵的计算方法。

Element stiffness matrix and equivalent load matrix of structures with varying sections are derived by employing the principle of virtual work.

接着，本文利用虚功原理推导了变截面结构的单元刚度矩阵和等效荷载列阵。

According to the virtual work principle, its element stiffness matrix and equivalent node forces were formulated explicitly, and its compatibility and convergence were summarized briefly.

根据虚功原理，推导出了这种单元的单元刚度矩阵及等效结点荷载的显式，并对其协调性和收敛性加以概括说明。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。