Comments on: Modeling Mechanical Systems: The Double Pendulum http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/ This blog is about Simulink. Sat, 11 Feb 2012 11:34:45 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Seth http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1708 Seth Wed, 08 Feb 2012 15:14:49 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1708 @Mike - "Do not work" is a very general condition. If you would like further help on this, I suggest posting to <a href="http://www.mathworks.com/matlabcentral/answers/" rel="nofollow">MATLAB Answers</a>. Good luck. @Mike – “Do not work” is a very general condition. If you would like further help on this, I suggest posting to MATLAB Answers. Good luck.

]]> By: Mike http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1664 Mike Thu, 29 Dec 2011 19:12:51 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1664 Hi, I was wondering if I can have the two models separately, i.e. simulink and simmechanics? I have tried to run them separately but they do not work. Hi, I was wondering if I can have the two models separately, i.e. simulink and simmechanics? I have tried to run them separately but they do not work.

]]> By: mohammad jafari http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1526 mohammad jafari Sat, 23 Jul 2011 22:59:04 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1526 how can i model a mechanical sydtem wich has a joint with more than 3 elements? i mean 3 or more element connect with a joint in one place? how can i model a mechanical sydtem wich has a joint with more than 3 elements?
i mean 3 or more element connect with a joint in one place?

]]> By: rima ghosh http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1316 rima ghosh Tue, 21 Dec 2010 08:42:59 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1316 i have just installed matlab2010b and making a simple pendulum as suggested in your example. the link length is = 15cm.Initial condition is set to -60 deg. CS1 and CGCs have same orientation. when i measure angular position (in radians) it goes from -1.04 deg to -2.09 rad(approx). should it not go from -60 deg to 0 to + 60 deg . the angular position plot is like having a offset to the expected value i have just installed matlab2010b and making a simple pendulum as suggested in your example. the link length is = 15cm.Initial condition is set to -60 deg. CS1 and CGCs have same orientation. when i measure angular position (in radians) it goes from -1.04 deg to -2.09 rad(approx). should it not go from -60 deg to 0 to + 60 deg . the angular position plot is like having a offset to the expected value

]]> By: Seth Popinchalk http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1311 Seth Popinchalk Thu, 16 Dec 2010 16:02:23 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1311 @Mahaboob Basha Qureshi - I reccomend you post your question to the <a href="http://www.mathworks.com/matlabcentral/newsreader/" rel="nofollow">MATLAB Newsgroup</a>. @Mahaboob Basha Qureshi – I reccomend you post your question to the MATLAB Newsgroup.

]]> By: Mahaboob Basha Qureshi http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1310 Mahaboob Basha Qureshi Thu, 16 Dec 2010 06:52:58 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-1310 please tell me TCSC model to subsynchronous resonance in power systems please tell me TCSC model to subsynchronous resonance in power systems

]]> By: Guy http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-992 Guy Mon, 08 Mar 2010 13:27:41 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-992 @Iman, To add friction to a joint in SimMechanics you need to add one actuator/sensor port to the Revolute Joint. Then connect to this port the "Joint Spring & Damper" block from the Force Elements section of the library. @Iman, To add friction to a joint in SimMechanics you need to add one actuator/sensor port to the Revolute Joint. Then connect to this port the “Joint Spring & Damper” block from the Force Elements section of the library.

]]> By: Iman http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-988 Iman Sat, 06 Mar 2010 17:34:47 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-988 Hello What if we want to add friction to Single pendulum system in Simmechanics? Thanks. Hello
What if we want to add friction to Single pendulum system in Simmechanics?

Thanks.

]]> By: Guy http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-903 Guy Mon, 23 Nov 2009 22:17:49 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-903 @Mary - Typically when you design a controller for a SimMechanics plant, you measure position and velocity signals using sensors. In Simulink your controller computes the torque or force to be fed back to SimMechanics through an actuator. A similar approach can be taken to interface SimPowerSystems to SimMechanics To learn more about this topic I recommend looking at two demos: - Simulink Power Window Controller and Detailed Plant Model In this model the mechanics of a car electric window is modeled in SimMechanics and the electrical motor in SimPowerSystems. - Hybrid Electric Vehicle (HEV) Power Train Using Battery Model This demo shows an example of interfacing a SimPowerSystems machine with a SimDriveline power-train. The principle is the same when interfacing with SimMechanics. As I mentioned above, you need to feed the torque generated by the SimPowerSystems machine to SimMechanics through an actuator. You measure the resulting velocity with a SimMechanics sensor and feed it back to the SimPowerSystems engine. A final note, SimElectronics motors might be easier to interface with SimMechanics since Interface blocks are provided. I hope it helps Guy @Mary – Typically when you design a controller for a SimMechanics plant, you measure position and velocity signals using sensors. In Simulink your controller computes the torque or force to be fed back to SimMechanics through an actuator. A similar approach can be taken to interface SimPowerSystems to SimMechanics

To learn more about this topic I recommend looking at two demos:

- Simulink Power Window Controller and Detailed Plant Model

In this model the mechanics of a car electric window is modeled in SimMechanics and the electrical motor in SimPowerSystems.

- Hybrid Electric Vehicle (HEV) Power Train Using Battery Model

This demo shows an example of interfacing a SimPowerSystems machine with a SimDriveline power-train. The principle is the same when interfacing with SimMechanics.

As I mentioned above, you need to feed the torque generated by the SimPowerSystems machine to SimMechanics through an actuator. You measure the resulting velocity with a SimMechanics sensor and feed it back to the SimPowerSystems engine.

A final note, SimElectronics motors might be easier to interface with SimMechanics since Interface blocks are provided.

I hope it helps

Guy

]]> By: mary http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-900 mary Mon, 23 Nov 2009 05:47:52 +0000 http://blogs.mathworks.com/seth/2009/02/26/modeling-mechanical-systems-the-double-pendulum/#comment-900 i have a SimMechanics set of blocks, transferred using Simmechanics Link from solidworks. It worked fine till now. Now, I want to model the full system; it will include motors and sensors. I want to model my stepper motor into Matlab, and connect it to the readily modeled physical system (using SimMechanics blocks) and actuate my system. I tried to use 'hybrid stepper motor' model from SimPowerSystems toolbox but got problems.. Any advice regarding this? i have a SimMechanics set of blocks, transferred using Simmechanics Link from solidworks. It worked fine till now. Now, I want to model the full system; it will include motors and sensors.

I want to model my stepper motor into Matlab, and connect it to the readily modeled physical system (using SimMechanics blocks) and actuate my system. I tried to use ‘hybrid stepper motor’ model from SimPowerSystems toolbox but got problems.. Any advice regarding this?

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