Vibrational Modes: How They Affect Motion

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SUMMARY

The discussion centers on the analysis of vibrational modes in a Bimorph beam (PEH) using accelerometer data. The "Predicted" graph was generated through Finite Element Analysis (FEA) tools, while the "Measured" graph represents actual data collected from the system. The data acquisition involved exciting the MEMS arm with a high mechanical impedance source and sweeping the frequency to obtain the vibrational response, akin to plotting the transfer function of a 2-port network.

PREREQUISITES
  • Understanding of vibrational modes and their significance in mechanical systems
  • Familiarity with Finite Element Analysis (FEA) tools
  • Knowledge of accelerometer data acquisition techniques
  • Basic principles of transfer functions in network analysis
NEXT STEPS
  • Research advanced Finite Element Analysis (FEA) techniques for vibrational analysis
  • Explore methods for optimizing accelerometer data collection
  • Learn about mechanical impedance and its effects on vibrational modes
  • Study the principles of transfer functions in greater detail
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Engineers, researchers, and students involved in mechanical design, vibration analysis, and sensor technology will benefit from this discussion.

Kajan thana
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TL;DR
I understand the basic meaning of vibrational mode. Could someone interpret what this graph means?
1637767754603.png

Ps: It is not a homework hence why I did not leave it under that headline.
 

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What is the test setup? Is this accelerometer data?
 
This data is on Bimorph beam (PEH)...
 
Kajan thana said:
This data is on Bimorph beam (PEH)...
Oh, like this: https://www.google.com/url?sa=t&rct.../8/4/645/pdf&usg=AOvVaw2DBGVt6_5h1-fJ0Yv-EqoI

Kajan thana said:
Summary:: I understand the basic meaning of vibrational mode. Could someone interpret what this graph means?
So the "Predicted" graph was likely plotted using FEA tools, and the "Measured" graph was plotted directly from the acquired data. Presumably they were exciting the MEMS arm with a high mechanical impedance source and sweeping the frequency of that source to get the plot. Similar to how you plot the transfer function of a 2-port network...
 
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