SOLIDWORKS Quick Tip - Natural Frequencies, Mode Shapes, and Vibration Tutorial

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This is a short tutorial describing what are natural structure frequencies and mode shapes. You can run a frequency analysis to have the software find the natural frequencies, periods, associated shapes and relative deflections. The value to the designer is that you can alter structure characteristics to modify the frequencies and avoid resonance with motors and pumps.
QuickTips video presented by Tony Botting of GoEngineer
About GoEngineer: GoEnginneer delivers software, technology and expertise that enable companies to unlock innovation and deliver better products faster. With more than 30 years experience and thousands of customers in high-tech, medical, machine design, energy and other industries, GoEngineer provides best-in-class design solutions from SOLIDWORKS, Stratasys, CAMWorks and Agile PLM.
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[@nikhilchhabra]

i did similar analysis for my project....
search "RD-2120: Response Spectrum Analysis".
This will provide you tutorial by Altair's Hyperworks.

[@marssa7221]

can someone tell me plz how to determine if load frequency "coincides" with the natural frequency, i know they shouldn't be the same but how far should they be away from each other?

[@goengineer]

Take a look at the plot in this Wikipedia article: en.wikipedia.org/wiki/Resonance
For the simple system they represent there, you can see how they’re determining a range of potential problem frequencies near the peak resonant frequency. You can see that response isn’t a sharp peak, but sloped dependent on the damping of the system.
The Frequency module shown here doesn’t have a method to include damping and determine response, so we’d have to estimate that by hand.
However, if you have Simulation Premium, which comes with the Linear Dynamics module, you can estimate damping and apply loads, and output response. With that you could either view plots or create plots similar to what you see in Wikipedia’s resonance article.

[@thereturnofthejester9820]

@@goengineer how do i calculate the exciting frequency from a load? for example i have steel frame structure with an electric motor, with 1490 rpm. If i divide rpm by 60 i will get 24,83 Hz. So if i do a modal analysis in Solidworks the first few natural frequencies cant be this number (24,83 Hz)? Do i get it right? Thank you for your answer!

[@changw_w9413]

at 1:20 what does it mean by in-plane load？can anyone help to explain? Thank you.

[@pushpakp]

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

[@felipeospina7795]

hi, if i need to design an isolated table, and analize how to reduce the vibration that comes from the floor, how can i do that??

[@NitishKumar-ue6nj]

Hi I was using solid works for frequency analysis, a cylindrical beam with area 78.5 sq mm and length 200mm fixed at one end. the results show two close natural frequencies, I am pretty sure that it is not true because the same model in matlab is yielding no close results. They are quite distinct
Frequency(Hertz)
in solid works in matlab
182.76 182.5
182.78 1135
1135.8 3139
1135.9
3139
3139.4
how should I understand the results from solid works? can any one please explain.

[@emacantsaoir]

+Nitish Kumar
my understanding is that there are two vibration modes at 90deg to each other at each of these frequencies.
e.g 182.76Hz in the x direction and 182.78Hz in the y direction. if you look at the mode shapes they should appear to be at 90deg to each other.
If it was a rectangular beam these two frequencies would be different as the beam would have a different stiffness in the two directions.

[@NitishKumar-ue6nj]

Yes that is what it is, I realized it later. Thanks for your help.