Search found 8 matches
- Wed Sep 08, 2021 8:49 pm
- Forum: PyBullet Support and Feedback
- Topic: Simple model not working, please help
- Replies: 2
- Views: 5895
Re: Simple model not working, please help
Since torque control of the motor is not working, as a workaround I can calculate the expected acceleration from the torque, integrate for the velocity, and use velocity control of the rotor. I am using this in another application (not the one I posted above), where I calculate the torque from aerod...
- Wed Sep 08, 2021 6:16 pm
- Forum: PyBullet Support and Feedback
- Topic: Simple model not working, please help
- Replies: 2
- Views: 5895
Re: Simple model not working, please help
Problem partly solved. I had not used the URDF_USE_INERTIA_FROM_FILE flag in loadURDF, so PyBullet was defaulting to an inertia tensor of zero. When I included the flag, I got an error message "Bad inertia tensor properties, setting inertia to zero for link", apparently because in my URDF ...
- Tue Sep 07, 2021 1:50 am
- Forum: PyBullet Support and Feedback
- Topic: Simple model not working, please help
- Replies: 2
- Views: 5895
Simple model not working, please help
I have created an extremely simple model of a rotor rotating around the z-axis. The base link is a heavy rectangular box, the rotor is a single link representing two opposing rotor blades, and there is a continuous joint with a vertical axis between the links. When I use velocity control of the join...
- Mon Aug 30, 2021 4:34 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Problem simulating an autorotating rotor
- Replies: 2
- Views: 2544
Re: Problem simulating an autorotating rotor
Unfortunately, this did not solve the problem. At first I thought that it had, but then I realized that I had reverted the program back to velocity control, and when I go back to torque control I still can't get an angular velocity greater than 81 rpm (which is a lot less than 100 radians/sec anyway).
- Sun Aug 29, 2021 7:50 pm
- Forum: General Bullet Physics Support and Feedback
- Topic: Problem simulating an autorotating rotor
- Replies: 2
- Views: 2544
Re: Problem simulating an autorotating rotor
I did some more searching and found a possible answer on this forum. By default, the maximum angular velocity of a joint is limited, with the default limit being 100 radians/sec. This can be changed using:
p.changeDynamics(body_name, joint_index, maxJointVelocity=10000)
I'll give this a try
p.changeDynamics(body_name, joint_index, maxJointVelocity=10000)
I'll give this a try
- Sun Aug 29, 2021 5:42 am
- Forum: General Bullet Physics Support and Feedback
- Topic: Problem simulating an autorotating rotor
- Replies: 2
- Views: 2544
Problem simulating an autorotating rotor
I am trying to build a model rocket that would land by deploying free-wheeling rotor blades from its nosecone, rather than the usual parachute, basically converting the rocket into a gyro-glider under radio control. I have worked out the basic aerodynamics of the rotor blades, and created a simple s...
- Fri Jul 30, 2021 5:13 pm
- Forum: PyBullet Support and Feedback
- Topic: Can't modify the example .urdf files
- Replies: 1
- Views: 4548
Re: Can't modify the example .urdf files
I found the problem. During installation of PyBullet, the "pybullet_data" folder apparently gets copied into
"\Users\<myname>\AppData\Roaming\Python\Python39\site_packages\", which is where the files get loaded from. Now I can edit the files.
"\Users\<myname>\AppData\Roaming\Python\Python39\site_packages\", which is where the files get loaded from. Now I can edit the files.
- Wed Jul 28, 2021 6:10 pm
- Forum: PyBullet Support and Feedback
- Topic: Can't modify the example .urdf files
- Replies: 1
- Views: 4548
Can't modify the example .urdf files
I am getting started with PyBullet on Windows 10. I entered the "Hello PyBullet World" script from the Quickstart Guide and it runs fine, using the r2d2.urdf file. When I tried running it using other sample .urdf files from the pybullet_data folder, that also worked. But when I created my ...