I am doing robotic arm simulation in Matlab Simulink but get the error. How I can resolve this.
My model given below.
Other details:
1. image of coordinates with world coordinates.
2. 6 DOF joint setting
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$\begingroup$ Could you please add the orientation of the revolute joints? Preferably in world coordinate system? Also adding the exact configuration of the 6DOF joint would help. $\endgroup$– 50k4Mar 3, 2017 at 7:22
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$\begingroup$ Hello @50k4, As you asked me the details therefore I am sharing my full folder on dropbox. Kindly comment if you face any problem in accessing the folder. Looking for your help .Thanks. dropbox.com/sh/vvjw2rvoba1g9jj/AABX5LKmpOkKXmRGpomtbyQVa?dl=0 $\endgroup$– Naseeb GillMar 3, 2017 at 11:35
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$\begingroup$ Posting the details of the joints in the question would help more, I don not have access to Matlab currently $\endgroup$– 50k4Mar 3, 2017 at 11:43
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$\begingroup$ Hello 50k4, as you asked I added two more images in question. I hope you are asking for same. $\endgroup$– Naseeb GillMar 3, 2017 at 12:25
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$\begingroup$ I did a similar simulation using SolidWorks: youtube.com/watch?v=crJXUlzJ918 $\endgroup$– LCarvalhoFeb 19, 2018 at 20:02
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1 Answer
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You cane find a detailed explanation on how to set the joint actuation types here. It seems that you need to set the torques as automatically computed, otherwise these are set to zero.
Furthermore, as it seems, the robot only moves in the x-y plane, but there is a z offset wrt the world coordinate system. Please make sure that this is handled correctly (you can use the same offset before the 6dof joint or you can allow for z axis movement)
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$\begingroup$ Thanks 50k4, As you suggest my that error vanished but new error is coming as shown. An error occurred while running the simulation and the simulation was terminated Derivative of state 'Revolute3.Rz.w' in block 'rob/Revolute3' at time 22.91008778271366 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances). .....continue on next comment. $\endgroup$ Mar 7, 2017 at 7:23
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$\begingroup$ .....continue from previous comment... i tried to solve it by changing solver type, step size but all are in vein. Can you suggest me what modification should I do with solver type, step size etc. to work it perfect. $\endgroup$ Mar 7, 2017 at 7:28
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$\begingroup$ Could it be that it is in fact a singular pose of the robot? In a singular position, when you try to compute the joint velocities from the Cartesian velocities the results is an infinite value. Industrial robot controllers have ways to cope with this, but these techniques cannot be use when you rely on a solver to solve your model equations. $\endgroup$– 50k4Mar 7, 2017 at 10:45
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$\begingroup$ Another option is that the signal generator you are using the generate e reference trajectroy has a high jump in position and the numerical derivation gives an infinite velocity already for the Cartesian velocity. Try to use smooth motions for the Cartesian reference trajectroy and see if the problems still shows up $\endgroup$– 50k4Mar 7, 2017 at 10:47