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频率响应函数
相关语句
  frequency response function
    IDENTIFICATION OF MULTIPLE-INPUT MODAL PARAMETERS FROM MULTIPLE FREQUENCY RESPONSE FUNCTION
    用多重频率响应函数识别多输入多输出系统的模态参数
短句来源
    Time domain dynamics response, frequency response function and root mean square value are taken to evaluate the vibration influence on the light-beam propagation performance quantitatively.
    提出了将时域动态响应、频率响应函数和均方根值作为机械振动对光束传输性能影响的定量评价值。
短句来源
    A Galileo telescope system mounted on an optical platform is analyzed, and the time domain dynamics response, frequency response function and root mean square value of the light-beam misalignment are obtained.
    以某置于光学平台上的聚焦扩束望远镜系统的振动失调量问题为例,进行了结构的有限元法动力分析,得到了该失调光学系统的时域动态响应、频率响应函数和均方根值。
短句来源
    Finally, the analogous flexibility polyfit method and the mode shape polyfit method are compared with two other relevant methods-the mode shape curvature method and the frequency response function curvature method.
    最后,将类柔度拟合法、振型拟合法与振型曲率方法和频率响应函数曲率方法进行了对比。
短句来源
    To control excitation spectrum shape, the control method of correction by the frequency response function is proposed. In order to raise the precision of the excitation spectrum, some sp-ecific measures are illustrated in the modal test of vehicle driver's cab.
    文中,还给出了拖拉机驾驶室的随机信号激振伪模态试验实例,试验中,通过用频率响应函数修正谱形的方法达到控制激励谱的目的,并进而阐述了提高激励谱控制精度的实际措施。
短句来源
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  frequency response functions
    1. The statistical characteristic of frequency response functions of single and two degrees of freedom structures with uncertain physical parameters are obtained by using Monte-Carlo method, and some results are presented.
    主要工作如下:1.用Monte-Carlo数值模拟技术对含随机参数结构频率响应函数进行分析。 在单自由情况
短句来源
    Frequency response functions (FRF) are the direct measurement data and include more information about the state of structure, so the method based on FRF should have more precise identification.
    基于频率响应函数(FRF)与基于模态参数的损伤识别方法相比,不但省去了模态分析步骤,减少了分析误差,而且FRF在频域范围能提供更多的关于结构状态的信息描述。
短句来源
    A procedure of structural dynamics modifications based on the fit model of frequency response functions(FRFs)is presented.
    本文提出了一种基于频率响应函数拟合模型的结构动力修改的分析方法。
短句来源
  “频率响应函数”译为未确定词的双语例句
    FRF Method of Computation Model Adjustment
    计算模型修正的频率响应函数方法
短句来源
    the In order to prove the credibility of experiment results, we experimentalized for two times by the PULSE multi-instrument and virtual instrument differently, and we get pulse response time history curve, frequency response curve and coherence function curve by experiment.
    为了验证试验结果的可靠性,分别使用PULSE多分析仪、虚拟仪器两套仪器对样机进行试验模态分析,测出冲击响应的时间历程曲线、频率响应函数曲线以及相干函数曲线。
短句来源
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  frequency response function
The typical frequency response function chart of the whole machine and its sanding parts, as well as its second-order mode charts of contacting roller, were obtained.
      
In the range of 1-150 Hz, the frequency response function (FRF) of the body structure is calculated by a finite element method (FEM) to get the dynamic behavior of the auto-body structure.
      
Uncertainty analysis of strain modal parameters by Bayesian method using frequency response function
      
In this paper, strain modal parameters are considered as random variables, and their uncertainty is analyzed by a Bayesian method based on the structural frequency response function (FRF).
      
Conclusion:"Gabarith tested" means that a pressure kit, in combination with a catheter and a monitor, has had its frequency response function measured and that the function falls within a tolerance band for dynamic accuracy.
      
更多          
  frequency response functions
It also gives a detailed comparison of the natural frequencies and frequency response functions (FRFs) obtained from experimental modal testing, the initial FE model and FE models updated by GA, SA, and combination of GA and SA (GA-SA).
      
Frequency response functions for most cells were unimodal and skewed towards zero frequency when plotted on linear scales.
      
At a fixed retinal location, cells of different classes had different frequency response functions.
      
The results indicate that the band-pass response characteristics of the spatial frequency response functions of striate cells derive largely from intracortical inhibition.
      
Temporal frequency response functions of lateral geniculate nucleus (LGN) X-cells were more narrowly tuned than those of their retinal inputs.
      
更多          


In a hydrodynamic lubricated journal bearing supported rotor system, the oil-film stiffness and damping characteristics are very important to the prediction of vibration performance and to which turbo-generator set designers usually pay much attention. The procedure of experimental determination of such characteristics presented in the past was imperfect since the results obtained were rather dispersive. Many aspects which influence the accuracy of measurement have been investigated in the Bearing Research Group...

In a hydrodynamic lubricated journal bearing supported rotor system, the oil-film stiffness and damping characteristics are very important to the prediction of vibration performance and to which turbo-generator set designers usually pay much attention. The procedure of experimental determination of such characteristics presented in the past was imperfect since the results obtained were rather dispersive. Many aspects which influence the accuracy of measurement have been investigated in the Bearing Research Group in Xian Jiaotong University. Several preliminary conclusions could be made now from the investigation, such as 1. When inverted test rig structure in designed, the inertia terms in the equations of motion play an important part in the force equilibrium and an amount of error will be brought in when they are neglected; 2. The axes of the test bearing and the shaft should be kept parallel as well as possible by the rig structure design; 3. The most important influence of the shaft deflection under load on measuring accuracy is due to the deflection difference at bearing middle and at the position the non-contact transducers are mounted therein, and a correction should be made carefully to the values measured by the tranducers; 4. The "noise" introduced due to inhomogeneity of magnetic and electric conductances at the rotating shaft surface when inductive and eddy current tranducers are used might be in a higher order comparing with the displacement signals; 5. The gain factors and phase factors of the frequency-response functions of an instrument system are different for different channels, therefore a dynamic calibration procedure is necessary. The improvement made by the BRG concerning to and some of the results including data and curves are also introduced in the present work.

在流体动压滑动轴承支承转子系统中,油膜的刚度阻尼特性,对于予测振动是非常重要的,因而经常深受汽轮发电机组的设计师们的注意。然而过去发表的试验测定方法尚不完善,所得结果离散度很大。我们曾经研究了影响测量精度的多方面因素,并得到如下之初步结论:1.当设计的是倒置结构的试验台时,运动方程中的惯性项在力平衡中起相当作用,忽略这一项将产生一定的误差;2.所设计的试验台应尽可能保证试验轴承和轴的轴线平行;3.轴受载挠曲对测量精度最重要的影响是产生于轴承中点处和安装非接触式传感器处的挠度不一样,因而必须仔细地修正传感器的测得值;4.当使用电感式或电涡流式传感器时,由轴的旋转表面导电率和导磁率不均匀产生的噪声可能比位移信号大一个数量级;5.一个仪表系统各通道频率响应函数的增益因子和相位因子是不同的,因而需要采用动态标定措施。本文还介绍了我们的解决方法和结果数据。

In this paper the pseudo-random excitation is applied to thecomplex structure test. The pseudo..random signal is generated by microcomputer with mult-iplicative congruential method. This paper proves in theory that it is statio-nary and ergodic. In the pseudo-random signal. To control excitation spectrum shape, the control method of correction by the frequency response function is proposed. In order to raise the precision of the excitation spectrum, some sp-ecific measures are illustrated in the modal test of...

In this paper the pseudo-random excitation is applied to thecomplex structure test. The pseudo..random signal is generated by microcomputer with mult-iplicative congruential method. This paper proves in theory that it is statio-nary and ergodic. In the pseudo-random signal. To control excitation spectrum shape, the control method of correction by the frequency response function is proposed. In order to raise the precision of the excitation spectrum, some sp-ecific measures are illustrated in the modal test of vehicle driver's cab.

伪随机激振是结构模态试验的一种有发展前途的方法。本文叙述了用乘同余法在微机上生成伪随机信号的原理,论证了生成的信号的平稳性及各态历经性,分析了磁带伪随机激振方法的实用性。文中,还给出了拖拉机驾驶室的随机信号激振伪模态试验实例,试验中,通过用频率响应函数修正谱形的方法达到控制激励谱的目的,并进而阐述了提高激励谱控制精度的实际措施。

By using the theory or elastic vibration, in this paper sets the partial differential equation of beam's vibrat ion is eslablished. Based on the modal analysis, beam's vibrational characteristics are described by the frequency response function. Finally, this paper states the effects of the beam's structure in controlling vibration and noise.

本文利用弹性振动理论,建立了侧板振动的偏微分方程。通过模态分析,用频率响应函数描述了侧板的振动特性,从而指出了侧板的结构对减振降噪的影响。

 
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