Physics of Maximum Amplitude versus Driving Frequency Question referring an original model found in EJS examples found in.....\source\users\davidson\wochristian\osc\SHOResonance.xml
Dear Prof Wolfgang,
i am puzzled as to the correct ODE equation for the driving force's acceleration component.
is it
+A*Math.cos(omegaD*t)/m
or
+A*Math.sin(omegaD*t)/m .
the resultant plots for +A*Math.cos(omegaD*t)/m starts at Amplitude =1 which is what i believe is correct but it does not have the maximum curve characteristics (see picture)
for case 2: the resultant plots for +A*Math.sin(omegaD*t)/m starts at Amplitude =0 which is what i believe NOT correct but it has the maximum curve characteristics (see picture).
Any advise how i can model the driving force such that
1) start at Amplitude= 1 (usually we teach with a nonzero value in our lecture notes)
2) has the desired maximum curve characteristics which exists in our teaching materials (usually we do teach this feature).
read more:
http://weelookang.blogspot.sg/2014/03/ejsresonancefrequencyvsamplitude.html
model DL here
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejs_model_SHOResonancewee.jar
source is also attached for consideration into the OSP collection please
thanks! Post edited March 19, 2014 at 11:04 PM EST.
Attached File: ejs_src_SHOResonancewee.zip
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