Search found 51 matches
- Tue Sep 20, 2022 8:49 pm
- Forum: Simulation of Coupled Arm-Robot Motion to Design Rehabilitation Interventions
- Topic: Simulation of Coupled Arm-Robot Motion to Design Rehabilitation Interventions Public Forum
- Replies: 2
- Views: 579
Re: Simulation of Coupled Arm-Robot Motion to Design Rehabilitation Interventions Public Forum
A journal article on this work should soon be published in the journal Multibody System Dynamics. The title of the article is "Computational modeling and simulation of closed chain arm-robot multibody dynamic systems in OpenSim."
- Wed Mar 02, 2022 3:00 pm
- Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
- Topic: Rotation Sequence for Kinematic Data
- Replies: 1
- Views: 696
Re: Rotation Sequence for Kinematic Data
There is no rotation sequence for motion capture data. Mocap data is just (x,y,z) coordinates of markers, which we turn into joint motions (some of which may have rotation sequences associated with them) using an Inverse Kinematics analysis.
- Wed Mar 02, 2022 2:58 pm
- Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
- Topic: synchronised eTibia data - fifth Grand Knee Challenge
- Replies: 1
- Views: 637
Re: synchronised eTibia data - fifth Grand Knee Challenge
I just downloaded the Synchronized Motion Data.zip file for the Fifth Competition, and the synchronised eTibia data for the Overground Gait Trials is there. It appears that this issue was fixed in response to your message.
- Wed Mar 02, 2022 1:24 pm
- Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
- Topic: CAD file
- Replies: 3
- Views: 1312
Re: CAD file
We were only allowed to release reverse-engineering CAD (i.e., STL) models of the implant components generated from laser scans, since companies guard their actual CAD geometry closely.
If you want to turn a .STL model into a NURBS model, I suggest using Geomagic Design X (formerly Geomagic Studio).
If you want to turn a .STL model into a NURBS model, I suggest using Geomagic Design X (formerly Geomagic Studio).
- Wed Mar 02, 2022 1:14 pm
- Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
- Topic: Fifth Competition Max EMG Trial Data Not added added
- Replies: 1
- Views: 443
Re: Fifth Competition Max EMG Trial Data Not added added
Unfortunately, those data were never processed and have been lost
.
![Sad :-(](./images/smilies/icon_e_sad.gif)
- Tue Jun 08, 2021 11:25 pm
- Forum: OpenSim
- Topic: Does OpenSim 4.x Work on Apple M1 Chip?
- Replies: 1
- Views: 567
Re: Does OpenSim 4.x Work on Apple M1 Chip?
So I will now answer my own question :-). My daughter was visiting and she has a Macbook Air with the new Apple M1 chip in it. I installed OpenSim 4.2 on it and did Tutorial 3 involving Model Scaling, Inverse Kinematics, and Inverse Dynamics, plus I tacked on Static Optimization for good measure. Th...
- Thu May 27, 2021 9:37 pm
- Forum: OpenSim
- Topic: Does OpenSim 4.x Work on Apple M1 Chip?
- Replies: 1
- Views: 567
Does OpenSim 4.x Work on Apple M1 Chip?
I am curious if anyone has tried running OpenSim 4.x on a Mac with Apple's new M1 chip. I know that no native M1 build exists for OpenSim, so the question is whether OpenSim still works when running in Rosetta 2 emulation mode. If anyone has any experience here, I would love to hear whether or not O...
- Fri Mar 26, 2021 1:42 pm
- Forum: OpenSim
- Topic: OpenSim Inverse Dynamics for Closed Kinematic Chain with Skewed Joint Axes
- Replies: 1
- Views: 632
OpenSim Inverse Dynamics for Closed Kinematic Chain with Skewed Joint Axes
I have an inverse dynamics analysis question for systems with a closed kinematic chain and a joint rotational axis direction that is 'skewed' and not along any of the parent or child body x, y, or z axes (for example, <axis>0.0048 0.9991 0.0424</axis>). For a model with only open kinematic chains, w...
- Wed Mar 10, 2021 10:31 pm
- Forum: OpenSim
- Topic: Incorrect Weld Constraint Orientation
- Replies: 3
- Views: 921
Re: Incorrect Weld Constraint Orientation
Thanks Dr. Habib. You were 100% correct.
When I gave the second body close to the correct orientation as its initial orientation, then the weld constraint assembled the bodies exactly as it should have.
I appreciate the fast and extremely helpful response!
When I gave the second body close to the correct orientation as its initial orientation, then the weld constraint assembled the bodies exactly as it should have.
I appreciate the fast and extremely helpful response!
- Mon Mar 08, 2021 11:04 pm
- Forum: OpenSim
- Topic: Incorrect Weld Constraint Orientation
- Replies: 3
- Views: 921
Incorrect Weld Constraint Orientation
I am trying to weld the hand of an arm model to the hand rest of a robot model, but the weld constraint keeps welding the two bodies together with incorrect relative orientation. To explore the issue, I created a box body that I connected to ground with a 6 DOF custom joint. I then welded the box to...