Hello All
One of the most important aspects of any vibration analysis is Vibration Limit. So one may expect that for most powerful generators (steam turbine driven generators) these data are readily available. It is not true.
What is available - Vibration Limits on bearings and rotor...
Hi All,
I'm doing analysis of modal test data. I found that mode shapes look different depending on method for deriving/visualization!
For particular frequency:
By First method - Amplitude ("Displays the modal vector in a derived real mode format.") - I see bending of the...
Hi All
There is a long beam with known mass (m), moment of inertia (I), material properties (E - Young's modulus) and dumping decrement (d). The task is to make spring/mass model which amplitude (in the middle of span) and frequency will be the same as for the beam first bending mode...
What dose they mean (in CSI) by saying: Instantaneous Linear Spectrum (ILS)?
I have time realization of a signal and its ILS accrued by CSI spectrum analyzer 2400. In order to understand what I get as ILS, I've computed: APS, Linear APS, PSD and Linear PSD. They differ from ILS drasticaly! So...
Sirs, colleagues,
the CSI-2400 spectraanalyzer cable, for accelerometers with the built-in amplifiers has broken down, - it is necessary to replace. Are there any pitfalls besides that cable mast be shielded (15 ì is required)?
With the best regards,
Dmitry Semenov
Hi, All
I'm using for modal tests a shock hammer implemented with accelerometer, established on its top. On how many I know a force cell is common choice for hammer implementing and it is always established on the hammer tip.
I want to find out, whether there will be errors in estimations...
Whether exists any programs which allow to estimate mechanical characteristics of object knowing characteristics of its vibration? I am going to use ANSYS, however as I know, this package has no special means for solving of such problems.
With the best regards,
Dmitry
Let us look at free vibration of 1 degree of freedom oscillator model with viscous friction. Oscillator vibration caused by impact.
It is known that in the resonance zone Cross Phase Function is changing up to 180 degrees. The problem is Cross Phase variation is observed on the background of...
