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1·The modal frequency of the packaging structure increases with the elastic modulus of potting material.

封装结构的模态频率随着灌封胶弹性模量的增大而增大。

2·Modal frequency and vibration response of the gear box are computed by structural FEM with a 3-d FE model.

建立齿轮箱三维有限元模型，采用结构有限元法计算齿轮箱模态频率和振动响应。

3·Cable local vibration has little effect on the modal frequency, but more on the modal energy distribution.

索的局部振动虽然对结构主要振型的频率影响不大，但对振型能量分布有比较明显的影响。

4·The dynamic characteristic of linear rolling guide affected by modal frequency and modal shape was studied.

为了提高结构的动态刚度，可通过修改直线滚动导轨的结构，使低阶模态频率相应提高。

5·The modal frequency response and its sensitivity analysis for the coupled system using the direct method and the eigenmodes.

分别采用直接法和模态叠加法，计算声场-结构耦合系统的声压响应水平及其敏度。

6·A new approach is presented for feature extraction from sound signals generated by the structure sound radiation in frequency domain using modal frequency.

提出了一种基于模态频率的声信号频域特征信息提取方法，并将该方法用于堆垛机结构的冲击载荷分类识别研究。

7·The transfer of shearing and moment must be considered in dynamic analysis because the model of dowel bar affects the modal frequency and modal shape directly.

指出传力杆模型对模态频率和主振型有直接影响，动力分析中应当考虑接缝的剪力传递和弯矩传递。

8·It Outlines the fundamentals and the basic mathematical model of identifying modal frequency and damping by means of parameter identification with frequency domain and time domain.

简要介绍了用频域参数识别方法和时域参数识别方法识别模态频率和阻尼的基本原理和基本数学模型。

9·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。

10·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。