http://weelookang.blogspot.sg/2013/10/longitudinal-sound-wave-in-pipe-model.html

changes made:

9 jan 2012 Design layout to usual bottom

A = 0.49 instead of 0.4 previously to make same as lecture notes

add Nodes texts and extra

add Antinodes text and extra

add v = f*lambda assuming speed of sound is 330 m/s

10 Jan 2012 add modeling component through drop-down menu and input field for learners to key in equations to understand the standing waves formed

readjusted position of pipes and everything to start at y = 0 instead of the previous y =0.5 for ease of modeling

3 October 2013 reduce the number of air molecules representation (RED) to draw to 19 and thicken the lines

added text into actual frames "u(t,x) displacement" and "p(t,x) pressure"

add text pipe side view

add text "pressure variation BLACK=-1, BRIGHT=+1 "

add dt= slider to allow slowing slow of the simulation

added boundary or envelope of the amplitude in dark-grey

made u(x,t) and p(x,t) appears as the check-box is selected

http://weelookang.blogspot.sg/2013/10/longitudinal-sound-wave-in-pipe-model.html

https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejs_pipewee02.jar

author: Juan Aguirregabiria and lookang (this remix version)

Key features designed:

Symbolic text to support visuals NAN, node, anti node node etc.

Can simulate closed or open end of a pipe

Microscopic visual of molecules enhanced with order and random position referencing tat leong codehttps://dl.dropbox.com/s/y8xsj6zx4xaqsur/ejs_longitudinal_waves_leetl_wee_v3.jar

dt for slowing and speed up simulation

amplitudes for envelope of displacement visuals

pressures for learning of real equipment sound detector to be placed at the maximum/minimum pressure from the ambient atmospheric as highlighted by kian wee

inputs field for calculation of any length of pipe

modelling-mathematical features as highlighted by peng poo and oon how as key to deepening learning