2023 BFY4 Abstract Detail Page
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| Abstract Title: |
W22: Acoustic resonance lab for Fourier and modeling skills |
| Abstract: |
We have developed an acoustic resonance lab with a goal that students gain experience with Fourier transform spectral methods and assessment and revision of models. In this workshop, participants will use a digital oscilloscope to record audio signals from hollow cylinders struck with a mallet. The fast Fourier transform tool (FFT) of the 'scope provides the frequency spectrum in which the fundamental resonance mode and higher harmonics are observed. Used in a lab class, students measure fundamental frequencies for tubes of different lengths and compare first to a simple standing wave model. Finding disagreement with data for short tubes, they can revise the model to include end effects. Other topics explored may include broadening due to observation time, dependence of spectrum on point of impact, Q factor, driven oscillator response, distortion from signal clipping, FFT frequency limits, and aliasing. We will also show use of a FPGA signal analyzer (Moku:Go) as an alternate equipment option. |
| Abstract Type: |
Workshop
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Author/Organizer Information |
| Primary Contact: |
Timothy Roach
College of the Holy Cross
Worcester, MA 02138
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Workshop Documents |
| Workshop Doc 1: |
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| Workshop Doc 2: |
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| Workshop Doc 3: |
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