The center of mass of a system is defined as follows: I have here some kind of an object not just a point mass, but it has a finite size.
系统的重心,是这样定义的：,我有一个物体,不是有棱角的物体，但它大小有限。
Firstly, the influence of width of water body and height of water level to vibration property of structure was calculated, according to the finite field addition mass method.
首先，按有限域内附加质量方法计算了不同水体宽度、不同水位高度等对结构自振特性的影响。
A finite element method is presented to determine the steady state elastic responses of planar mechanisms with distributed mass, operating at a prescribed input rotary speed.
本文给出了一种求解具有均布质量、恒定输入转速的弹性平面连杆机构稳态响应的有限无法。
A finite volume method was utilized to perform a discrete solution for the equations of mass, chemical components, momentum and heat energy conservation.
利用有限体积方法对质量、化学组分、动量和热量守恒方程进行离散求解。
Two methods considering dynamic water pressure in ANSYS were studied, which were finite field addition mass method and sequence weak coupling solving method.
重点研究了在ANSYS中考虑动水压力的两种方法，即有限域内附加质量法和顺序弱耦合算法。
Using this relation, we calculate the two-loop Debye mass from relevant pressures at finite temperature and chemical potential.
利用这个关系以及有限温度与有限化学势下的相关压强计算了德拜质量的双圈修正。
Based on the theory of stochastic finite element, the structural parameters of frame shear structure including stiffness and mass and damping are simulated to be stochastic variables.
以随机有限元理论为基础，将框剪结构的刚度、质量、阻尼等结构参数为随机变量。
Finite element method is used to build up element stiffness matrix and element mass matrix. After the combined total stiffness matrix and the total mass matrix are obtained.
采用有限元法建立不同管道元件的单元刚度矩阵和单元质量矩阵，最终形成管道结构的总刚度矩阵和总质量矩阵。
The text is detailed to study the deducing process of the nodal finite difference equation, and to study its application hi the rock mass engineering problems.
本文详细研究了节点有限差分运动方程的推导过程，以及在岩土工程问题中的应用。
According to Finite Element Method, the impactor is considered as a discrete mass system in terms of 3D solid element with initial velocity, and 2D shell element is used for target plate.
首先采用有限元法，将撞击体离散成由三维实体单元构成的具有一定初始速度的离散质量系统，对靶板采用二维壳单元离散。
The finite element model is expressed by mass and stiffness parameters, which are determined by minimization of weighted Euclidean, norms of orthogonality conditions and characteristics equations.
有限元模型用质量和刚度参数表示，这些参数由正交条件和特征方程的加权欧氏范数取极小值来确定。
In this paper, a finite element method with lumped mass formulation is applied to analyse the transient SH wave propagation in an elastic half-space with a dipping layer.
本文采用一种类似于差分方法的集中质量有限元模型和人工边界透射理论分析倾斜成层弹性半空间中瞬态SH波的近场波动问题。
A local transmitting boundary is combined with a lumped-mass finite element technique to form a mechanical model simulating the near field steady wave motion.
本文将局部透射边界和集中质量有限元技术结合起来形成一个模拟稳态近场波动的力学模型。
In turbulence model, the simulation applied finite volume method to solve the mass conservation equation, momentum equation, turbulent kinetic energy equation and turbulent dissipation rate equation.
在湍流模型下，使用有限体积法求解质量守恒方程、动量方程、湍动能方程和湍动耗散率方程。
When a structure vibrates in water, large amount of computation will be unavoidable if the fluid finite element method is used to calculate the added water mass matrix and damping matrix.
当结构在静水中振动时，如采用流体有限元来计算流体的附加质量和附加阻尼，势必导致解题规模过大。
In this paper, a discrete local transmitting boundary is combined with a lumped-mass finite element technique for simulating steady wave motion in the viscoelastic layered medium.
本文将离散的局部透射边界与集中质量有限元方法相结合，用于模拟粘弹性成层介质中的稳态波动。
The finite element model, computation response of driving force and dynamic characteristic are established by taking double mass spring damping system for example.
以双质量弹簧阻尼系统为例建立有限元模型，计算动力响应以及动态特性。
An efficient numerical method for simultaneously updating mass matrix and stiffness matrix of a finite element analytical model based on incomplete modal data measured is presented.
提出一种基于不完全模态测量数据同时修正有限元质量矩阵与刚度矩阵的有效数值方法。
A virtual balancing method of a flexible rotor based on rotor dynamic and finite element method is proposed in this paper to decrease the vibrations caused by mass unbalancing.
为了有效地降低回转机械由于质量不平衡引起的振动故障，基于转子动力学理论和有限元数值分析方法，进行了柔性转子系统虚拟动平衡研究。
Complex analysis is an effective finite element method to simulate the dynamic response of rock soil mass to earthquake.
复反应法是用来分析地震动力作用下岩土体动力性质的有限元方法之一。
Updated co-moving coordinate finite element based S-R decomposition theorem is convenient to track deformations of points in the deformed configures, to assure the mass equilibrium of element.
基于s - R分解原理的更新拖带坐标有限元法分析这类构件，有利于跟踪变形物体中各点的变化，保证单元的质量守恒。
The interaction between two parallel cracks in rock mass under the combined action of tension and shearing is analyzed by finite element method.
采用有限元法，对岩体在拉剪综合作用下平行双裂纹相互影响的情况进行了计算。
The final finite-volume discretization equations are derived using the Hamilton principle. Meanwhile the global nodal force vector, mass matrix and tangent stiffness matrix of the cable are obtained.
再根据哈密顿原理导出了悬索大挠度振动的有限体积离散方程，推出了索的整体节点力向量、质量矩阵和切线刚度矩阵。
With the finite element method of material description, the rock mass in underground and opencast united mining engineering was simulated and analyzed.
采用物质描述增量有限元方法，对露天与地下联合开采工程岩体进行了数值模拟分析。
Building a finite element model of bridge, which accurately reflects the true structure's stiffness and mass distribution, can improve the precise of dynamic analysis results of structure very much.
有限元模型对桥梁质量和刚度分布模拟是否准确，直接影响桥梁的动力分析结果。
Elements by the highly-accuracy six-node triangular element are divided. Stiffness matrix and mass matrix of sandwich panel are established and then deduced dynamical equations of finite elements.
应用高精度的六节点三角形单元进行单元划分，建立复合夹层板的刚度矩阵、质量矩阵并推导有限元动力学方程。
An extension of Finite Cell Method (FCM) is presented, which was used to simulate mass transport process in porous media with unhomogeneous porosity. We also gave two numerical examples here.
对有限颗粒法(FCM)进行了推广，将FCM用于模拟二维变孔隙率下多孔介质中污染物运移情况，并给出相应的数值算例。
It is necessary and useful in engineering to modify a finite element model or some elements of mass and stiffness matrix by using modal test results.
利用试验模态分析结果，对有限元力学模型本身或其中某些参数进行修改是必要的和有工程意义的。
The finite volume method was applied to the calculation, which is based on the fundament conservation laws of mass, momentum, species and energy.
采用有限容积法计算了质量、动量、组分与能量守恒方程。
The finite volume method was applied to the calculation, which is based on the fundament conservation laws of mass, momentum, species and energy.
采用有限容积法计算了质量、动量、组分与能量守恒方程。
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