NATS 1720 Lecture Notes - Lecture 14: Overpressure, Normal Mode, Standing Wave
15 Nov 2017
School
Department
Course
Professor
Document Summary
Nove(cid:373)ber 14, u(cid:374)it 6 pipes a(cid:374)d stri(cid:374)gs. Recall: open pipe is a pipe that is open at both ends. A closed pipe is a pipe that has one end open and the other one closed. Note: a waveform envelope is a smooth curve outlining the extremes of a wave to create the visual of a constant amplitude when there are many different overtones simultaneously present. It the display of many waveforms as one smooth curve, giving a general idea of what the waveforms would look if they are superimposed on each other. Think of it as a superposition of waveforms. The end-point of a pipe has set boundary conditions, which are in effect at the boundary between the interior and the exterior of the pipe. At a closed end (e. g. a barrier or wall at one end of the pipe), air molecules can pile up". Density of air molecules increases at the barrier.
