Find Natural Frequency of Structure: Cube (Box) of Honeycomb Sandwich Panels

AI Thread Summary
The discussion focuses on determining the natural frequency of a cube made from honeycomb sandwich panels, with a simulated modal analysis in Ansys yielding low frequencies of 0.3 Hz and 0.5 Hz for the first and second modes, respectively. The user seeks practical verification methods for these frequencies, considering options like Sine Sweep Testing on a shaker and impact testing using a hammer, accelerometer, and signal analyzer. Additionally, there is a request for useful online resources or ASTM standards related to verifying the natural frequency of structures. The conversation highlights the need for mathematical modeling of the cubical box to further understand its vibrational characteristics. Overall, the thread emphasizes the importance of practical testing and verification in structural analysis.
kashoo
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What is exact procedure to find the Natural Frequency of a structure...i.e a cube (box) of Honeycomb Sandwich Panels...i have simulated the Modal Analysis in Ansys...there i got the natural frequency of very low amount ...almost 0.3Hz for First Mode,0.5 Hz for Second Mode and so on...i think it is very less amount ...How can i Practically Verify this Natural Frequency...please guide me in this area...what about Sine Sweep Test on Shaker...Can i do it on Impact Testing(Hammer+Accelerometer+Signal Analyzer+Data Accquisition ) ?
Plz tell me some useful links on web or Standard Method ASTM for verifying Natural Frequency of Structure...
What about Mathematical Modeling of this Cubical Box.
 
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