2.1. Key Concepts

Try these first

1. 1.

   What is the definition of frequency?

   Hint

   Think about how often a cycle occurs in a second.

2. 2.

   What does the amplitude spectrum represent?

   Hint

   Consider what happens to energy in a signal of varying frequencies.

3. 3.

   What does the Fourier Transform do?

   • Converts frequency signals to time domain
   • Converts time signals to frequency domain
   • Increases noise levels

   Hint

   Recall that it breaks down a signal into its frequency components.

4. 4.

   True or False: The amplitude spectrum indicates the frequency components' magnitudes.

   • True
   • False

   Hint

   Think about what it shows on a graph regarding frequencies.

5. 5.

   A bridge's frequency response shows a distinct peak at 2 Hz. After testing, engineers observe the resonance frequency shifts to 1.8 Hz. Discuss the potential implications of this shift regarding structural health.

   Hint

   Consider how resonance relates to structural integrity.

6. 6.

   You collect vibration data from a machine running at 50 Hz but notice additional frequencies at 5 Hz and 10 Hz in the spectrum. Propose a method to analyze these unintended frequencies and what they might indicate.

   Hint

   Think about how filtering can help clarify your data.