The natural frequency and vibration mode are the principal modal parameters representing structure dynamic behavior as well as the important basis for evaluating bridge dynamic performance.
固有频率和振型是反映结构动力特性的主要模态参数，是评价桥梁动力性能的重要依据。
Why is natural frequency important in vibration analysis?
在振动分析中，为什么自然（固有）频率很重要？
Then the natural frequency and correspondent vibration mode are gained.
从而可求出固有频率及相应的振型。
The swing is a pendulum with a single natural frequency depending on its length.
秋千是只有一个固有频率的摆，此频率决定于它的长度。
The test result shows that clamper greatly increases only the first natural frequency.
结果表明，夹板只对第一阶固有频率有较大提高。
The location of joint surface has a close relation with the natural frequency of the structure.
接合面的位置对结构的固有频率也有较为明显的影响。
At first the method for calculating the fundamental natural frequency of structure is researched.
首先研究了结构的最低阶固有频率的计算方法。
Calculations were conducted of the fan rotor natural frequency, vibration modes and critical speeds.
本文针对风机转子进行了固有频率振型和临界转速计算。
In chapter three, the nonlinear natural frequency of the shallow spherical reticulated shell is solved.
在第三章中主要研究了扁球面网壳的非线性固有频率问题。
Experimental results indicated that the amplitude response changed obviously close-by the natural frequency.
实验表明，在固有频率附近幅值响应有明显的变化。
The critical load and natural frequency of rhombus plates with simply supported at all edges are calculated.
作为算例计算了四边简支菱形板的自振频率和临界载荷。
A finite element method for analyzing vibration mode and natural frequency of tire construction was provided.
提供了一种分析轮胎结构的固有振型和频率的有限元方法。
The results showed that the mount spacing can be varied to adjust the natural frequency of the rotational mode.
结果说明：改变隔振元件的间距能调整扭转振动的固有频率的大小。
A finite element method is presented for the calculating natural frequency of turbogenerator stator end windings.
本文提出一种计算汽轮发电机定子绕组端部振动固有频率的有限元方法。
This paper introduces the micro magnetometer and analyses the natural frequency and driving voltage of the sensor as well.
文中介绍了基于这一原理的微型磁强计，对传感器的固有频率和驱动电压进行了分析和计算。
Utilizing ANSYS, the static deformation and natural frequency for the spindle of the nc boring-milling machine are analyzed.
利用有限元分析软件ANSYS计算数控镗铣钻床主轴的静态变形与一阶固有频率。
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。
When the vibration source frequency approaches to the natural frequency of belt weigher, the belt weigher will bring resonance.
当振动源频率和皮带秤固有频率接近时，皮带秤将发生共振。
To study the influence of rotary inertia on gear flowmeter natural frequency, keep damping and leakage coefficient as constant.
结果表明：与增大泄漏系数、阻尼系数相比，减小转动惯量可以明显的提高流量计的频率响应。
For accurate natural frequency, it is necessary that the analysis technique incorporate the effect of structural parameter randomness.
为获得准确的频率响应值，有必要在今后的结构动力特性分析中考虑结构参数随机性的影响。
The paper puts forward a convenient and efficient method on the analysis of vibration natural frequency for ring ultrasonic wave motor stator.
本文提出了一种用于分析环形超声波电动机定子振动固有频率的简便、有效的方法。
The natural frequency is a critical parameter of structure vibration; it is the foundation to investigate the dynamic response of composite beam.
而结构动力特性中的自振频率是反映结构自身特点的重要参数，是研究组合梁动力学问题的基础。
The figures of the characteristic curves of the natural frequency are plotted based on the characteristic relationships of the natural frequency.
根据非线性固有频率的特征关系式画出了非线性固有频率的特征曲线。
Then a new type of structural optimization is proposed by employing one of the main indexes of structural dynamic characters i. e. natural frequency.
在此基础上，引入结构动特性的主要指标之一的结构固有频率，提出了一种新的结构优化形式。
An interval analysis method was proposed for the influence analysis of the model error to the computational results of natural frequency of structures.
给出了一定误差水平下的模型误差对固有频率计算结果影响程度分析的区间方法。
On the base of sensibility analysis, an optimization for tensioner is performed with the lowest sensibility of system natural frequency as the objective.
在灵敏度分析的基础上，以系统固有频率灵敏度最低为目标对张紧机构进行优化。
The modification for the natural frequency and the mode of vibration of blade are needed to treat the fault of steam turbogenerator caused by it's blades.
为分析处理汽轮发电机组运行中因叶片振动引起的故障，需调整叶片的固有频率和振型。
The influence of flowing velocity, pressure, solid_liquid coupling damp and solid_liquid coupling stiffness on natural frequency are discussed respectively.
讨论了流体的流速、压强变化以及固—液耦合阻尼和固—液耦合刚度对管道固有频率的影响；
The influence of flowing velocity, pressure, solid_liquid coupling damp and solid_liquid coupling stiffness on natural frequency are discussed respectively.
讨论了流体的流速、压强变化以及固—液耦合阻尼和固—液耦合刚度对管道固有频率的影响；
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