CoppeliaSim forums

I constructed a model for 6-DOF Stewart paralle mechanism in V-rep to accomplish dynamics simulation. 6 force sensors are used to measure the force between 6 cylinders and top platform. The model can operate in my desired pattern, but I guess the output from displacement and force sensors is wrong w...

Hello, did you try to switch to a different engine? Did you try to adjust the dynamics step size? Also, remember that during one simulation step, you normally have (by default) 10 dynamics steps. So reading the force sensor is basically the results of 10 averaged measurements. The simplest test wou...

I constructed a Stewart platform in Vrep demonstrated in Fig.1 and output the measurement values from force sensors. The measured force is supported by 6 electric cylinders to top platform. Why does the curves appear so chaotic? The Fig.2 is the output from Vrep and Fig.3 is from adams. Their algori...

Your prismatic joints have a problem: their position minimum is -0.15, and their range is 0.15. (range is not the upper limit). If you want an upper limit of 0.15, then you should specify a range of 0.3 You will probably have to tweak your simulation quite a bit to make your 4-legged robot walk wit...

Your prismatic joints have a problem: their position minimum is -0.15, and their range is 0.15. (range is not the upper limit). If you want an upper limit of 0.15, then you should specify a range of 0.3 You will probably have to tweak your simulation quite a bit to make your 4-legged robot walk wit...

any particular reason you perform a dynamic simulation? Do you need to measure forces in the platform joints? You will never get as stable and precise results using the dynamics engine for your calculation. If possible, make the kinematic representation of your platform, and set the platform end-ef...

in general, try to keep the overall mass same, and even-out the masses internally, in order to avoid that kind of simuations. Same for the inertias. Those requirements are not that important with the Vortex engine (and to a certain extent with the Newton engine). So you should always switch engines...

Hello, I suspect that your joint is generating internal collisions (enable contact point display to verify that). The other suspicion is that your masses and inertias might be wrong. Make sure to carefully read this page , mainly the design considerations 7 and 8. Cheers Thanks for your help, I hav...

I have two problems: 1. how to build a cardan joint using two revolute joints to accomplish the dynamic simulation? I have tried several times to use a sphere pure shape to connect the two revolute joints, and add two dummy to the sphere pure shape and other shape. But the cardan joint I made cannot...