What is frequency response analysis - FEA for All

Frequency response analysis is an extension of modal analysis in some way. If you want to know about modal analysis, the full article is here:

In short, modal analysis helps to determine the modes of vibrations and the frequencies at which those modes are triggered, BUT modal analysis doesn’t give you any info about the real deformation that an excitation of one of those modes will actually cause. When you have to do a dynamic analysis, modal analysis is only the beginning!

Some modes will cause more « resonance » than others (and thus more damage)… so we want to know which ones and we want also to calculate the maximum deformation for each of the modes « triggered ».

Go on the blog to read the full explanation:

[donaldduck]

Usually I avoid videos which start with "This is My Horn", but this video was very useful, even though I'm more confused than before I watched it.
Still getting my head around modal analysis, (for CubSats during launch), knowing which modes are critical, how to know which of an infinite number of modes impart more structural loading and displacements on the CubSat. How to look at individual components and sub-assemblies with in the entire system etc. Looking into mode participation factors now to try to understand what's important and what's rubbish.

[sidibomma]

Really good explanation in this media. I have seen many videos. But yours explanation is the best.

[rahulupadhyay]

Hey Cyprien. This is by far the best tutorial I have found on the topic. Very well explained. Please keep making more such videos.

[farazuddin]

It is a very helpful video to understand the harmonic response. You cover all the things of harmonic analysis.

[tharunsuresh]

Extremely helpful for beginners in modal analysis irrespective of the software they use!

[sofiab]

Thank you so much for taking the time to make this video! I knew nothing about FRF before this but i have somewhat of a vague idea now. Very much appreciated!

[realkanavdhawan]

I really appreciate your work, THANKS for sharing your knowledge for FREE
It is such a hard thing to find now a days

[charan]

Great work cyprien.!!
Looking forward to more updates from you.
If I understand this correctly for frequency response, after you have done the modal analysis, you have to run a static analysis. Then you define a modal frequency response associating the load to frequency and then giving a range of frequencies for the response. The question I had is the pressure load that you applied does it matter how much is the pressure load .? or you just have to define a reasonable pressure load .? The load you applied seems low so my question is if I am working on a different component will such a low pressure load still work or do i have to be very accurate defining the load.?

[ayrtondasilva]

Awesome. Great work, this is timeless.

[harikrishnans]

Really helpful. Please do video on how to get PSD values for random vibration and how to design components for random vibration

[muslimmukhtarkhanov]

Great video, but one thing is bothering me. In initial stage you performed modal analysis. Usually, loadings are not included in such analysis. Did you consider pressure in your initial modal analysis?

[rajeshsingh]

thanks!! for such a video, really needed and could please make video on "what after FR-Analysis, like time response, time points etc..."

[pushpakp]

Thank u so much for this such a great video..it's helpful of many Engineering actually I'm doing a electric go kart..so I have problem with simulation..can I have u r contact details sir .??

[deepya]

Nice explanation Rasu. I would like to know the conclusion from this analysis. what are important factors while considering response location & criteria for reducing response. waiting for your answer. Thanks Pradeep

[vivipo]

Merci beaucoup
C'est exactement ce que je cherchais.
Êtes vous toujours en Chine?

[thippeswamymr]

Very good explanation. Why should we consider less no of mode shapes(say 10 or 20) why can't we go or 50 or more

[MichaelHyde]

Thank you very much. This is most helpful!

[unholybehe]

Hey Cyprien, very good video, a lot of useful information there. Do you happen to have some video or article where you explain more about stress safety factors? I'd like to hear about that

[maxmahendran]

Thanks for the video - good introduction on FRF to me - however I have a question - dont we want to design the structure to have min NF higher than max operating frequency? When you set the Freq range (1000-10000hz) is this based on the operating frequency of the ultrasonic weld machine?

[yogeshbavge]

Hi cyprian..
As per my understanding we don't apply any load in modal analysis. We just apply boundary condition..but you are applying pressure of 0.1 mpa..Can you convince in which case we can do this.?