Please email [email protected] and we'll reach out to you soon.

@@CrystalInstrumentsUS Thank you very much

Евгений, при модальном анализе с 1й точкой возбуждения, измерительный акселерометр переставляется по точкам измерения для набора АЧХ, после сбора всех данных ( по каждой точки) идет построение движения модели. В случае визуализации в процессе виброиспытания - Online ODS, как ты верно заметил - для каждой подвижной точки ( степени свободы) необходим свой акселерометр, т.к. процесс проходит в реальном времени.

It wasn't mentioned how all of these points have been measured. Right, had the same thoughts. But I would not call it cheating - plot hole sounds friendlier 🙂

Can you tell us more about the Dbfa software that you were referring to? We recommend using our Modal Package since it is a single solution that is very easy to perform for modal testing.

thank you for the positive support! We will be sure to push out more videos like these.

Todor. When taking a response signal from the node (or near the node), you may not get any substantial response at all for some obvious reasons. Your data may not be necessary bad, but it won't be too meaningful for modal purpose. It is recommended to place the sensor away from the node.

Hi Todor. I suspect Walter will cover this in the future parts but here is a quick/dirty answer. How bad your results will be depends on what you are going to do with the data. If you put the excitation or response sensor on a node, the resulting frequency response function (FRF) will be missing the peak corresponding to the mode for that node. So, if your structure has 5 modes in the frequency range of interest, you should see 5 peaks. But since you are on a node, you will only see 4 peaks. In the parameter estimation phase, if you choose to use only that single FRF to identify the number or location (frequency) of the modes, you will obviously get it wrong. But if you use that FRF along with other FRF's (assuming the others are not on nodes) to identify the modes (e.g. Mode Indicator Function or MIF), you should be able to find all 5 modes. The next phase of modal analysis would be to get the vectors or mode shape. In simple terms, you are trying to get the relative magnitude and phases between each DOF. The FRF for that node will then result is some probably erroneous phase but the magnitude will be very small. So, the mode shape will be right (since your supposed to get very small magnitude near a node). If you need more help, feel free to contact me. Not sure what identity shows up on KZbin but my name is Evro Wee Sit. I can be contacted at eweesit at LearnSV dot com. Or you could contact the folks at Crystal Instruments. They are a smart and nice group of people.