which seems to fail in your context.A solution should be to replace the PID bloc with a transfert function block made proper adding a very small term in s^2 for the denominator (sse the attched diagram)
Please report the problem in http://bugzilla.scilab.org/ Serge Steer Le 17/02/2014 21:51, john a écrit :
Hello, I'm new to Scilab and Xcos so may be making a simple mistake, but I have the following problem. I created an Xcos model of a simple mass-spring-damper with PID control using the data from the Matlab example shown here <http://ctms.engin.umich.edu/CTMS/index.php?example=Introduction§ion=ControlPID> . The Xcos results are the same as the Matlab example except for the case when all three gains are used as follows Kp=350, Ki=300 and Kd=50 . My result looks like this (red line) and is clearly giving a different response to the Matlab example for the same gain values. <http://mailinglists.scilab.org/file/n4028669/PID.png> I have tried different solvers and time steps, but this doesn't seem to be the problem. I have also modelled the problem in Mathcad 7, Mathcad Prime 3 and using csim in Scilab and all those results agree broadly with the Matlab example. Any advice would be greatly appreciated and I have attached the Xcos file for information. spring-damper-PID.zcos <http://mailinglists.scilab.org/file/n4028669/spring-damper-PID.zcos> -- View this message in context: http://mailinglists.scilab.org/Xcos-PID-controller-problem-tp4028669.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com. _______________________________________________ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
spring-damper-PID.zcos
Description: Binary data
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