固有频率

Some numerical results are given, which demonstrate the effects of plate thickness and foundation modulus on the natural frequencies.

最后给出了一些数值结果，表明板厚和地基模量变化对固有频率的影响。

It reports the effect of water to the order frequencies of frame,and gained the relationship between stiffness ratio of the gate and the plane steel frame of the radial gate.

对弧形钢闸门主框架动力稳定性进行了分析，考虑了水深对框架固有频率的影响，并比较梁柱刚度比对弧门主框架动力稳定性的影响关系。

A mechanical impedence method is described to predict the natural frequences of elastic beam under the condition of dynamic supporting with the example of helicopter tail rptor.

本文以直升飞机尾桨为例，介绍了确定弹性梁在动态支承条件下固有频率的一种机械阻抗方法。

Aiming at the key technology of numerical control, taking NC gear shaper as research object, some issues are studied in this paper.1 NC gear shaper YK5120 was developed.1 Three dimensional model of NC gear shaper is built, kinematics simulation and interference checking of NC gear shaper are carried out.2 Based on kinematic theory of multi-body system, the precision of gear shaper and the error of generated gear are analyzed and simulated.3 Applying finite element software, the natural frequency and mode of NC gear shaper are analyzed.

本文针对插齿机数控化中的关键技术，以数控插齿机为研究对象，做了以下研究工作：1 设计完成YK5120型数控插齿机机械结构；2 建立了数控插齿机的三维模型，并对其进行了运动仿真和干涉检验；3 以多体系统运动学理论为基础，对数控插齿机的精度和齿轮加工误差进行了分析与仿真；4 应用有限元软件，对数控插齿机的各阶固有频率及振型进行了分析。

The static and dynamic characteristics of the beam of a gantry-type machining center are analyzed by means of ADAMS and ANSYS. Considering effect of gravity and cutting forces, the static deformation of the beam is obtained after calculating the interacting forces between the guide and the slide block by ADAMS. Moreover, the contact parameters of the guide surface are acquired by dynamic tests and parameter identification, then they are applied to the simulation model of the beam-slide box system, whose natural frequencies and modal shapes are achieved by modal analysis. Furthermore, the effect of changes of the contact parameters on the dynamic behavior of the beam-slide box system is also investigated.

对一种国产龙门式加工中心的横梁关键部件，采用机械系统多刚体动力学仿真软件ADAMS和有限元分析软件ANSYS进行了静动态特性分析；在考虑重力和切削力作用下，由ADAMS计算出导轨与滑块间的作用力，从而计算出横梁部件的静态变形；通过动态测试和参数辨识方法获得导轨结合面特性参数并将其应用到横梁滑箱系统整体有限元模型中，经过模态分析得到系统固有频率和各阶振型图，并进一步分析了结合面参数变化对横梁滑箱系统整体动态特性的影响。

By using the Matlab procedure technology, the 6-DOF vibration isolations system natural frequency computation is simplified.

采用Matlab程序技术，简化了底部安装隔振器的六自由度隔振系统的固有频率计算工作量。

The outstanding feature of the new cutting dynamometer contrary to other type of dynamometer sensor is that it is more similar to general lathe tool. It can be installed on knife rest, so it is same wit practice state of cutting. Sensitivity of dynamometer is more high, especially main cutting force can attain 7.4pC/N. The calibration results show that it has high static linearity, and its natural frequency is greater than 5 kilohertz, so the cutting dynamometer has fully reached the dynamometer standard stipulated by CIRP-STCC.Finally, in order to measure the cutting force, the orthogonal experiment method in which the three factors are the diameter of cutting, feed and spindle speed is performed.

该新型车削测力仪与原有车削测力仪相比的突出优点是：它的外形接近一把普通的外圆车刀，可直接装夹在刀架上，与实际切削状态相同；传感器的灵敏度更高，尤其是主切削力方向可达到7.4pC/N；标定结果表明该传感器具有良好的线性静态特性，固有频率高于5kHz。

In the present study, the effect of centrifugal force was investigated by three dimensional finite element analyses; the vibration characters of random mistuned blade-disc were also being investigated by probability methods and the Young's modulus of material of all blades are regarded as random parameters.

结果表明，离心力对失调叶片轮盘系统局部化振动有减弱作用；所有叶片弹性模量在5%误差范围的随机失调系统，其固有频率与非失调相差很小，即失调叶片—轮盘系统可以按照循环对称结构进行模态分析。

The acceleration mobilities of rotor and fuselage subsystem and coupled system are key parameters for determining natural frequencies of the rotor/fuselage coupled system by using mobility matching method. We have deduced the analytical expressions. In order to verify the feasibilities of the expressions, it is necessary to measure those mobilities.

直升机旋翼和机身子系统以及其耦合系统的导纳是用动柔度匹配法确定直升机旋翼／机身耦合系统固有频率必要的数据，我们已推导了它们的分析表达式，为验证分析表达式的可用性，须进行试验测试与研究。

The fluid-structure interaction dynamic characteristic of steam generator U-bend tube is simulated by using ANSYS parametric design language,focusing on the influence of the anti-vibration bars of the U tube.

应用ANSYS参数化设计语言对蒸汽发生器U形管流体结构耦联系统动态特性进行了数值模拟，着重考虑了防振条对U形管固有频率的影响。

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。