固有频率

It is found that there are good relationships between the fundamental frequencies and the structural properties of straight-chain alkanes, and between the sum-frequencies and the additivity properties of straight-chain alkanes as well.

将直链烷烃分子看成是一个多自由度振动系统，用机械振动理论中的传递矩阵法计算了 C2~C32直链烷烃的固有频率，分析了固有频率随化合物结构单元的变化规律。

The paper introduces a kind of acoustics principle,and a new method which measuring resonance frequency of the circular saw blades by means of a sound level meter,inorder to provide the reference of testing resonance frequency parameter for all kinds of woodworking cutting tools.

介绍了一种利用声学原理，采用声级计为传感器的木工圆锯片固有频率测量的新方法，以期为各类木工刀具的固有频率参数测试提供借鉴。

The paper introduces a kind of acoustics principle,and a new method which measuring resonance frequency of the circular saw blade s by means of a sound level meter,inorder to provide the reference of testing resonance frequency parameter for all kinds of woodworking cutting tools.

介绍了一种利用声学原理，采用声级计为传感器的木工圆锯片固有频率测量的新方法，以期为各类木工刀具的固有频率参数测试提供借鉴。

The structure feature of the sensor was described in comparison with the classical Stewart platform-based six-component force sensor.By using the finite element method,the elastic dynamics theoretical model of the sensor was established based on the conditions of displacement consistency and force balance.According to this model,the numerical analysis was carried out,and the variety relationship curves between the natural frequencies and the structural parameters are plotted.

描述了该传感器相对于经典Stewart平台六维力传感器所具有的结构特点；利用有限元法，采用位移协调和力平衡条件建立了传感器弹性动力学理论模型，依此模型进行数值分析，绘制了固有频率与各结构参数间变化关系曲线；并利用ANSYS软件建立了传感器有限元模型，进行了振动模态分析，得到其固有频率和振型。

Due to the complication of the geometric shape and the non-uniform distribution of the mass and stiffness,it is impossible to obtain the exact solution of natural frequencies of low-finned tube s.

针对低翅片管几何形状复杂，质量和刚度分布不均匀，振动特征值不能有封闭解的问题，采用瑞利-里兹法对低翅片管的固有频率进行了数值研究，获得了低翅片管弯曲振动固有频率的数值计算模型。

It is pointed out that beacuse the first natural frequency is much smaller than the second one, it bears the primary function in vehicle guideway interaction.

分析指出轨道系统的第一固有频率远小于第二固有频率，在车轨耦合振动中起主要作用。

So the natural frequency in still water can be used in the case of moving water.

因此，可以用结构在静水中的固有频率近似结构在动水中的固有频率。

Under identical amplitude, when the inherent frequencies equal to the load's frequencies for the structure begin to sympathetic vibration, different point has different displacement which represent under the same frequency ,different point has different values.

在管道结构上不同点，相同的固有频率处对激励的响应值是不同的；在管道结构上的同一点上，不同的固有频率处对激励的响应值也是不同的。来源：06c6Aa2BC论文网www.abclunwen.com

Because the portal frame is also used in the rig for bogie fatigue strength testing, in which the imposed load is harmonic, the modal analysis is necessary. The fundamental vibration mode shapes and corresponding frequencies are calculated to validating that the natural frequencies of the structure have enough difference comparing to the load frequency, so sympathetic vibration can be avoided.

由于龙门架还要在疲劳试验台中用来进行转向架的疲劳试验，因此对龙门架进行了模态分析，计算龙门架结构的固有频率和振型，确保龙门架的固有频率远离转向架疲劳试验的加载频率，避免在试验中发生共振。

This paper puts forward the method of using the vibrating isolation ring to reduce noise ,and advances the definite principle of the rigidity of the vibrating isolation ring and calculation formula.

提出了用隔振环来降低振动筛噪声的方法，以及隔振环刚度的确定原则和计算公式。分析了安装隔振环后，对振动筛固有频率影响不大，可保证工作频率是最高固有频率的两倍以上，可保证振幅不低于原振幅的98%，基本上不降低工作效率。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。