The practice application expresses that effective modal mass could be helpful to find natural frequency and vibration shape.
应用表明用有效模态质量进行模态识别，可以有助于找到尾轴架系统的固有频率和振型。
The severe numerical instability in complex frequency modal mass identification from frequency response function makes it difficult to identify physical parameters.
利用频响函数识别复频率模态质量存在着严重的数值计算不稳定性，给物理参数的识别造成困难。
By modal stiffness matrix, modal mass matrix and modal frequency, shaft units of simulator is designed. The former three steps natural characteristics are identical with the real units'.
依据设计原则，利用模态刚度矩阵、模态质量矩阵和模态频率相似进行了扭振模拟机轴系的设计，扭振模拟机轴系前三阶固有特性与实际机组轴系扭振动特性基本一致。
The complex modal analysis method is generalized to the cases in which stiffness matrix may be singular and mass matrix, damping matrix and stiffness may be nonsymmetric.
把复模态分析法推广到刚度矩阵可以奇导且质量矩阵、阻尼矩阵和刚度矩阵均不必为对称的情形。
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。
Structural FE analysis on an integral bus is performed, in which optimal design of multiple performance objectives of structural strength, vibration modal frequency and mass is researched.
对某全承载式大客车进行了结构有限元分析，研究了该客车结构强度、振动模态频率、质量等多个性能目标的优化设计问题。
But at least all the data will be consistent and will not distort the modal parameter estimation process due to mass loading effects.
但是，至少所有的数据将是一致的，不会因为质量荷载影响造成模态参数估计过程失真。
The decrement of higher modal response of the rotor system is lost when damper mass-factor exceeds a limiting range.
当质量参数超出某有效区间时，系统将失去对高阶模态响应的衰减作用。
Detail analysis indicates that the mass cycle modal can improve the efficiency of mass transfer and mass exchange, and can be used in such regions as the control of indoor air quality and etc.
分析表明，质循环模型能够提高质传递和质交换的效率及可控性，可用于室内空气品质的控制等领域。
It shows that the modal shape and mode frequency are highly coupled with the VIV response of a Marine riser with low mass ratio.
该模型的计算结果表明，立管的模态振型、模态频率与涡激振动响应高度耦合，并且对于低质量比的情况尤为明显。
Based on the modal analysis and static stress analysis of the spindle box, it makes the mass of the spindle box optimization, the optimum parameters are attained and the design gets improved.
对箱体有限元模型进行模态和静应力分析，并以箱体质量为优化目标进行优化设计，得到最优化参数，改良了原有设计。
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。
Also this paper has tested the modal density of thin aluminum using point admittance, and discussed the influence of mass correction.
采用导纳法测试了薄铝板的模态密度，并对其测试结果进行了附加质量修正。
The decision principle of mode number is: when the error of base shear and top displacement are both below 5%, the sum of modal participating mass ratio should exceed 90%;
研究结果表明：高层建筑结构抗震设计中高振型的影响不容忽视，在底部剪力和顶端位移误差小于5%的情况下，累计质量参与系数应大于90%；
The decision principle of mode number is: when the error of base shear and top displacement are both below 5%, the sum of modal participating mass ratio should exceed 90%;
研究结果表明：高层建筑结构抗震设计中高振型的影响不容忽视，在底部剪力和顶端位移误差小于5%的情况下，累计质量参与系数应大于90%；
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