EJSS ammeter circular coil damping model with critical
damping
http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip
author: lookang
author of EJSS 5.0 Francisco Esquembre

EJSS ammeter circular coil damping model with critical
damping
http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip
author: lookang
author of EJSS 5.0 Francisco Esquembre

EJSS SHM model with resonance showing Amplitude vs
frequency graphs, heavy damping (RED)
frequency ratio for better x azes values
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMresonance01/SHMresonance01_Simulation.html
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMresonance01.zip
source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMresonance.zip
author: lookang
author of EJSS 5.0 Francisco Esquembre

No damping
EJSS ammeter circular coil
damping model with no damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Very light damping
EJSS
ammeter circular coil damping model with very light
damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Light damping
EJSS
ammeter circular coil damping model with light damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Moderate damping
EJSS
ammeter circular coil damping model with moderate
damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Critical damping
EJSS
ammeter circular coil damping model with critical
damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Heavy damping
EJSS
ammeter circular coil damping model with heavy damping http://weelookang.blogspot.sg/2014/03/ejssammeterangularcoildampingmodel.html https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMcoil/SHMcoil_Simulation.html source: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_SHMcoil.zip author: lookang author of EJSS 5.0 Francisco Esquembre 
Wikipedia
http://upload.wikimedia.org/wikipedia/commons/9/9c/AmpereometervintageHDR0h.jpg 
my edited version:
YJC note
The equations that model the motion of the car suspension spring mass system are:
where
Thus, this model assumes the following ordinary differential
equations:
where the terms