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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.