I am currently learning how to create a comprehensive Operational Deflection Shape (ODS) using Mescope and a Comtest VB8. I have successfully created a few examples that meet my expectations based on past phase readings. However, I have found the information extracted from the VB8 to be confusing. Instead of receiving a single reading for each measurement point (ODS FRF), there is a Fourier spectrum, coherence, and cross spectrum for each point downloaded into Mescope. When I create the animation equations (automatically matching points), the equations utilize all the data (coherence, cross spectrum, Fourier spectrum). This leads me to question if the software is generating the ODS FRF based on these three parameters. Is this software capable of generating ODS FRF from these parameters? Thank you, Gary.
The ODS FRF is not being generated in the data table displaying all measurements. To rectify this, deselect all points except for the ODS FRF data before regenerating the animation equations. I encountered a similar issue recently. - Dave
Upon downloading from VB8, I noticed that there is no option for downloading ODS FRF data. Instead, the available options include a Fourier spectrum, coherence, and cross spectrum. Regards, Gary.
Kindly refer to the attached document.
Additionally, continuing towards the bottom of the table.
Hey Gary, it sounds like you're really getting to grips with ODS creation and Mescope! To answer your question, the software does indeed use the coherence, cross spectrum, and Fourier spectrum values it received from the VB8. These parameters provide details on the phase relationship, amplitude relationship, and ratio of output to input across frequencies, respectively. All these parameters are mathematically related and help in coming up with accurate FRF which in turn creates the Operational Deflection Shape. So, to keep it simple, yes, the software is generating the ODS FRF based on these three parameters. Keep experimenting and learning!
Hi Gary, you're on the right track. Mescope and your Comtest VB8 work together to provide the most comprehensive picture of your ODS. It might be a bit overwhelming at first, but the extra data from the coherence, cross spectrum, and Fourier spectrum is actually what allows Mescope to create accurate animation equations, and subsequently, a detailed ODS FRF. Essentially, each of these parameters gives insight into different characteristics of the vibration, which when combined lends to the most accurate representation. So yes, the software is indeed generating the ODS FRF based on these three parameters. Each parameter, in its own way, contributes to the overall accuracy and detailing of the ODS. Keep exploring and happy learning!
Hi Gary, Indeed, your suspicion is correct! The software is designed to utilize all the available spectrum data to generate an ODS FRF which provides a much better overall approximation of the operational deflection shape. It's taking into account phase coherence, cross-spectrum data, and the Fourier spectrum to create a comprehensive ODS FRF. This actually improves the accuracy of your model since it's considering more factors. Yes, it might seem overwhelming at first, but once you get the hang of it, you'll appreciate the degree of detail it brings to your analysis. Keep learning and experimenting, you're on the right track!
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Answer: Answer: Mescope and Comtest VB8 provide Fourier spectrum, coherence, and cross spectrum data for each measurement point, instead of a single reading for ODS FRF.
Answer: Answer: Mescope uses all the data (coherence, cross spectrum, Fourier spectrum) to create animation equations that automatically match points, which may contribute to the generation of ODS FRF.
Answer: Answer: While Mescope does not directly provide a single reading for each measurement point (ODS FRF), it uses the provided Fourier spectrum, coherence, and cross spectrum data to assist in creating the ODS.
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