Constricting a tube at a pressure antinode leaves the frequency unchanged
Evidence
This means that for bounded waves, the impedance depends on the surface area within the bounding structure and so will change as the area changes. As we shall see later, changes in impedance can cause reflections. This effect is important in the design and function of many musical instruments, as discussed in Chapter 4. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 174 (
#responds-to, via linked claim)
Categorization
- XREF: connects to: Striking a membrane at a nodal line silences that mode entirely; Constricting a tube at a pressure node lowers the modal frequency; Bounded sound waves change impedance with tube area, causing reflections — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 174 (+1 more)
Related
- Bounded sound waves change impedance with tube area, causing reflections (similarity 0.88)
- Constricting a tube at a pressure node lowers the modal frequency (similarity 0.84)
- Pipe constrictions shift mode frequencies up or down depending on node position (similarity 0.82)
- Acoustic waves reflect at discontinuities in tract area (similarity 0.80)
- Hard boundaries reflect sound because pressure energy cannot cross a zero-velocity point. (similarity 0.80)
- Multiple open holes jointly shift the effective pressure node (similarity 0.79)
Broader Connections
- Constricting a tube at a pressure node lowers the modal frequency
#contradicts(0.95) - Bounded sound waves change impedance with tube area, causing reflections
#responds-to(0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 174