Search found 9 matches

by Amit Misra
Thu Dec 19, 2024 4:57 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Understanding Linear Velocities in a Rotational System Simulation Using Simbody
Replies: 8
Views: 1356

Re: Understanding Linear Velocities in a Rotational System Simulation Using Simbody

Hi Sherm, Thank you for your feedback and for pointing out the distinction between external and internal forces. I am a bit confused about the comment: "Also, those are external forces but I think you want only internal ones." Currently, I apply the torque using the following code: // Custom Motor F...
by Amit Misra
Tue Dec 17, 2024 3:55 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Understanding Linear Velocities in a Rotational System Simulation Using Simbody
Replies: 8
Views: 1356

Re: Understanding Linear Velocities in a Rotational System Simulation Using Simbody

Hi Sherm, Thank you for your detailed feedback and observations. I truly appreciate you taking the time to review my setup. What I am trying to model is a simple reaction wheel system. In this setup, one body (the base) is free-floating in space, and the other (the wheel) is controlled by a motor. T...
by Amit Misra
Sun Dec 15, 2024 4:39 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Understanding Linear Velocities in a Rotational System Simulation Using Simbody
Replies: 8
Views: 1356

Re: Understanding Linear Velocities in a Rotational System Simulation Using Simbody

Dear Sherm, Sorry to bother you again, but I am still struggling to fully understand and visualize the issue you explained. I deeply appreciate your earlier response, but I think I may still be misunderstanding some key points. My main goal is to verify the conservation of momentum in the system. If...
by Amit Misra
Thu Dec 12, 2024 4:56 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Understanding Linear Velocities in a Rotational System Simulation Using Simbody
Replies: 8
Views: 1356

Re: Understanding Linear Velocities in a Rotational System Simulation Using Simbody

Thank you for your detailed explanation, Sherm. I appreciate the insights about how mobility forces behave and the equal and opposite torques applied to connected bodies. That cleared up a lot of confusion. Based on your explanation, I have updated the code and applied the torque directly to the whe...
by Amit Misra
Thu Nov 28, 2024 4:47 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Understanding Linear Velocities in a Rotational System Simulation Using Simbody
Replies: 8
Views: 1356

Understanding Linear Velocities in a Rotational System Simulation Using Simbody

First of all, sorry to post this question during the holiday period, but I'm hoping someone might be able to help. I'm working on a simulation using Simbody where I have a chassis connected to the ground via a free joint, with two motors and wheels attached. The motors apply torque to the wheels, c...
by Amit Misra
Sat Oct 14, 2023 10:08 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Rotation Matrix notaion
Replies: 2
Views: 1645

Re: Rotation Matrix notaion

Hi Michael,

Thanks for explanation .
by Amit Misra
Sat Oct 14, 2023 2:57 am
Forum: Simbody: SimTK multibody dynamics API
Topic: Rotation Matrix notaion
Replies: 2
Views: 1645

Rotation Matrix notaion

Hi, I've been studying the notation used in Simbody, and I've encountered confusion regarding the transform notation. X_BG is "the transform from frame B to frame G." Vec3 v_B = ~X_GB.R()*v_G; Vec3 v_B = X_BG*v_G ; It seems to suggest that X_BG is a transform from frame B to frame G. Yet, in the cal...
by Amit Misra
Sun May 28, 2023 7:36 am
Forum: Simbody: SimTK multibody dynamics API
Topic: Drone
Replies: 1
Views: 1571

Drone

Hi ,
I am trying to use Simbody for Drone simulation for vertical lift . for drone what kind of joint should put is it free or some thing else .

My drone has four propeller.

Please let me know if i need further information
by Amit Misra
Sat Dec 03, 2022 10:32 pm
Forum: Simbody: SimTK multibody dynamics API
Topic: Few Question regarding setting initial angular velocity to body?
Replies: 6
Views: 4233

Few Question regarding setting initial angular velocity to body?

Hi , First, I like to say Simbody is an awesome tool for engineering modelling where accuracy is needed. We are using this to create the digital twin of our robot. Thank you for this speed. I am using simbody for my Project application. When I was playing with the code, I had a few questions. 1. I w...