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# ME 3263 Introduction to Sensors and Data Analysis (Fall 2018) | |
## Lab #3 Measuring Natural Frequencies | |
### What are natural frequencies | |
In free vibration (i.e., no external forcing), structural components | |
oscillate at specified frequencies or combinations of frequencies. Since | |
these vibrations are unforced, the associated frequencies are referred | |
to as natural frequencies; it's how the system vibrates if left to | |
behave on its own. In contrast, driven linear systems vibrate at the | |
driving frequency. An amplification of the response (called resonance) | |
occurs when the driving frequency coincides with one of the natural | |
frequencies. In short, the system is driven at a frequency at which it | |
likes to vibrate. Large amplitude oscillations are the result. So it is | |
important to know what the natural frequencies are *a priori* so you can | |
avoid driving the system into resonance. |