4.1. Cross-Spectral Analysis

Try these first

1. 1.

   What does cross-spectral analysis help us understand?

   Hint

   Look for hints about comparing signals.

2. 2.

   What is meant by 'transfer function'?

   Hint

   Think of input-output relationships.

3. 3.

   What is the primary purpose of cross-spectral analysis?

   • To measure time
   • To compare different signals
   • To represent a single signal

   Hint

   Think about the relationship between multiple data sources.

4. 4.

   True or False: Coherence measures the correlation between two signals at each frequency.

   • True
   • False

   Hint

   Evaluate what coherence denotes in signal processing.

5. 5.

   You are tasked with diagnosing a structural issue in a bridge. Explain how you would use cross-spectral analysis to assess vibrations recorded by multiple sensors.

   Hint

   Consider the relationship between collected data points from different sensors.

6. 6.

   Two machines generate vibrations measured by sensors. One shows a high coherence value between the inputs, while the other shows a low coherence. Analyze the possible implications for machinery diagnostics.

   Hint

   Focus on what coherence tells us about the signals' behaviors in each scenario.