Difference between revisions of "Modal Theorical FAQ"
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[https://orossas.sharepoint.com/:b:/g/support/EXaI-C0co7lNrKrXwfquUAgBSBFiQCeRrqVa4VhtQjYtRw?e=L7Zc8Z Could you explain the difference between time domain, frequency domain and modal space?] | [https://orossas.sharepoint.com/:b:/g/support/EXaI-C0co7lNrKrXwfquUAgBSBFiQCeRrqVa4VhtQjYtRw?e=L7Zc8Z Could you explain the difference between time domain, frequency domain and modal space?] | ||
[https://orossas.sharepoint.com/:b:/g/support/Ea9f9MN6HDRFsZpwejhz7NwBmCNR8dXZvc-vuCLIVoNGww?e=k2ATuM I still don't understand curvefitting ...] | |||
[https://orossas.sharepoint.com/:b:/g/support/EYn8VMAjMoVHqynlrHcaI-wBd7Oi5A55fjkyKHZAyPBeQg?e=rUffYN Someone told me SDM will never work] | |||
[https://orossas.sharepoint.com/:b:/g/support/EQddAeNBRVdIlU5bh9bZXTEBgLHRYnAduKohW9AovB_rKg?e=jax1z5 Is there any real advantage to MIMO testing? Why not just use SISO and then move the shaker?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EdcRQK9hbXlJnDYwtTpT-PIBLpl_qPzNmgGtAEsUjqJqVw?e=EJ9Lzi I ran a modal test on a portion of a structure of concern and many modes look the same!] | |||
[https://orossas.sharepoint.com/:b:/g/support/EVWdcqfwhc9Mshv8R6M5BKYB_I8x96uro6ItAhVah31wGA?e=qqb8So Is there a difference between a roving hammer and roving accelerometer test?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EVTrvk3ZJQNKkGlX6NmVl9cBDZMOI2kPc4vnKpUW2G9swA?e=ylkpgg Are you sure you can get mode shapes from one row or column of the H matrix?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EZrt0mNRSxdBtew4xoQjLTgB0evFRtDOgnhDzuOYIXLE7w?e=3ziz3G I hear about SVD all the time Could you explain it simply to me?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EVxxlCgPltJHslo8IlH2Y0wB5T_Z1Mn9mpXMiOhaIRWV8Q?e=h9dWZR Can the test setup have an effect on the measured modal data ? Do the setup boundary conditions and accelerometers have an effect?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EV4GFjhvcStErAqtxUDAFcUBU6db28UlUtckHR2l09Ad7A?e=3DHX1C is it better to collect averaged FRF data for a modal test? Or collect time data and process it afterwards?] | |||
[https://orossas.sharepoint.com/:b:/g/support/Ebec28JEGMVMvyRfvQZt0GgBOROstYIXhuvGDcWinV9r7A?e=HiXoPC What's the difference between local and global curvefitting ?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EUR6b2uoMXFDkHczw0ZVizwBTKY2otdmB3CNUz2t7-eAvw?e=hw0ffo Which shaker excitation is best? Is there any difference?] | |||
[https://orossas.sharepoint.com/:b:/g/support/EamEoIefNl5Pg0zVmkDUv_4Bh3TXKPJz991K65nXTbuxdg?e=3KQWga I'am still overwhelmed by all this modal stuffLaplace, Fourier, FRFs, and all that!] | |||
[https://orossas.sharepoint.com/:b:/g/support/EWVXgK-KbPBLn3VMLviBuuQB7XgfOpaAPUzLPe0dbMhe9A?e=AVixDw I showed some mode shapes to someone. They asked me if the structural design was ok. What should I tell them ?] | |||
Revision as of 13:08, 17 July 2020
When impact testing, can the use of the exponential window cause any problems?
What's the difference between a complex mode and a real normal mode?
Is it really necessary to reject a double impact?
Do I need to have an accelerometer mounted in the X, Y and Z directions to do a modal test?
Could you explain the difference between time domain, frequency domain and modal space?
Could you explain the difference between time domain, frequency domain and modal space?
I still don't understand curvefitting ...
Someone told me SDM will never work
Is there any real advantage to MIMO testing? Why not just use SISO and then move the shaker?
I ran a modal test on a portion of a structure of concern and many modes look the same!
Is there a difference between a roving hammer and roving accelerometer test?
Are you sure you can get mode shapes from one row or column of the H matrix?
I hear about SVD all the time Could you explain it simply to me?
What's the difference between local and global curvefitting ?
Which shaker excitation is best? Is there any difference?
I'am still overwhelmed by all this modal stuffLaplace, Fourier, FRFs, and all that!
I showed some mode shapes to someone. They asked me if the structural design was ok. What should I tell them ?