固有频率

Due to rotation characteristics of spindle and definite parameterized structure of aerostatics lubricated bearing ,mass-spring structural method equivalent to aerostatics bearing system was introduced and system main coordinates and inherent frequency were obtained by establishing dual movement equation.

针对气体静压主轴的运动特性和气体静压润滑轴承的参数结构，提出了采用质量-弹簧结构方法来等效气体静压轴颈轴承系统，并建立了系统二自由度运动方程，最终确定了系统的主坐标系和固有频率。

The tiny disturbing field in a new type of all-metal slab waveguide of CO_2 laser is calculated and analyzed by means of electromagnetic filed theory.

根据电磁场微扰理论对一种新型的全金属板条波导CO2激光器的波导内部的电磁场微扰进行了计算分析，结果表明，这种不规则形状的板条波导结构，由于微扰出现在电场较弱的区域，因此腔的固有频率是降低的。

Based on the alterative information of vibration mode and natural frequency in the presence of cracks, the thesis focus on the study of diagnosis index of cracks for plate and intelligent diagnosis of cracks using BP neural network.

本文主要依据板有无裂纹的振型和固有频率的变化信息，研究适于板的裂纹诊断指标，在此基础上，采用BP神经网络开展板的裂纹的智能诊断研究。

Because when the frequency of close to the meshing of gears susceptible to the natural resonance frequency.

因为当啮合频率接近于齿轮系的固有频率时容易发生共振。

When infrared ray irradiates to the surface of material and radiating frequency is same as material molecular frequency, the radiating energy is strongly absorbed by the material.

红外辐射是辐射物体以电磁波的方式传播内能的过程，当红外线照射到某一物体时，如果入射的红外线频率和物体分子固有频率相一致，则物质分子就会表现出对红外线的强烈吸收，吸收的那一部分能量就转化为分子的热运动，使物体温度升高，达到加热干燥的目的。

The control of an electromagnetic valve in the ABN brake chamber forces the spring to vibrate at a frequency of 18 times per second while braking, and also with certain natural frequency reciprocating motion.

利用停易ABN制动气室弹簧的振动及电控装置控制电磁阀激振，迫使气室弹簧在整个制动过程中不但以每秒18次的自振频率振动，同时又以一定的固有频率往复运动，利用弹簧的储能作用，将刹车时产生的声能和热能用弹簧的势能和动能来置换，从而达到降低制动噪声、温度和磨损的目的。

3 Fatigue strength analysis of WIG structure Combining the classical fatigue S-N curve with the theory of fracture mechanics the fatigue strength of some weak parts of WIG has been calculated.

产生影响的主要是结构的低阶频率，所以今后实验中如何排除弹性支撑刚度对结构低阶固有频率影响是今后实验中需要解决的问题。

Because of the thin thickness, the skin of gun-bay structure, the frame plane, the oil tank floor, and the plane that hold up the smoke of aircraft gun is considered as shell element.

运用Lanczos算法对炮舱结构有限元模型进行模态分析，得到炮舱结构前20阶的固有频率和振型，分析前6阶频率下炮舱整体结构以及炮梁的振动特点。

It is disadvantageous to stability of lunar rover.The frequency of wheel wave is a function of velocity of wheel motor, dimension of wheel,density of grousers and wheel slide.

车轮在垂直地面上的周期波动和前进速度的波动对于月球车来说是一个周期性的激励，其频率应与月球车系统的固有频率避开，防止月球车前进时产尘较大的振动。

First, natural frequency of Euler-Bernoulli beam with elastic bearing and without the axial force is put forward. And numerical method is used to solve the equation by a program designed by the author, and the influences of shearing deformation and rotatory inertia on frequency are analyzed.

首先对不考虑轴力影响的弹性支座Euler-Bernoulli梁的固有频率进行了推导，并用自编程序进行了数值法求解，同时分析了剪切变形和转动惯量(Timoshenko梁)对频率的影响。

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。