Search found 23 matches

by Jakob Welner
Mon Jul 18, 2016 11:38 pm
Forum: OpenSim
Topic: B.Sc Thesis on Human Gait Synthesis using PredictiveSim
Replies: 2
Views: 509

Re: B.Sc Thesis on Human Gait Synthesis using PredictiveSim

Ah yes, of course. I will do that. Thank you for the heads up.

Cheers
-jakob
by Jakob Welner
Mon Jul 11, 2016 9:36 am
Forum: OpenSim
Topic: B.Sc Thesis on Human Gait Synthesis using PredictiveSim
Replies: 2
Views: 509

B.Sc Thesis on Human Gait Synthesis using PredictiveSim

Hi, I am sorry in advance if thise post is misplaced in this forum, but I have found no better options. I recently finished my B.Sc Thesis in Mechanical Engineering revolving around Biologically Inspired Human Gait Synthesis using PredictiveSim by Tim Dorn and Jack Wang. My thesis was a means to get...
by Jakob Welner
Sat Dec 19, 2015 9:08 am
Forum: OpenSim
Topic: Saving and loading complete state of predictive simulation
Replies: 4
Views: 1034

Re: Saving and loading complete state of predictive simulati

Hi and thank you very much for your replies, and sorry for my slow response. I can't seem to get the notification e-mails to work for this forum. I have sadly had to postpone this issue as I couldn't afford to spend more time on it. However, following your comments I double checked the precision and...
by Jakob Welner
Tue Dec 08, 2015 4:49 am
Forum: OpenSim
Topic: Predictive Simulation: Who are engaged in this area?
Replies: 3
Views: 546

Re: Predictive Simulation: Who are engaged in this area?

Hi Chris, Thank you for your reply. I have looked up Carmichael Ong but he does not appear to have any publications on the matter? As for single-shooting stype as opposed to direct collocation I am actually not aware of those terms' relation to Predictive Controllers? Google didn't seem cooporative ...
by Jakob Welner
Sun Dec 06, 2015 3:14 pm
Forum: OpenSim
Topic: Predictive Simulation: Who are engaged in this area?
Replies: 3
Views: 546

Predictive Simulation: Who are engaged in this area?

Hi, Does anyone here know about groups or people around the world who are currently working with Predictive Simulation in biomechanics? - Mainly regarding gait but not necessarily. I know of: - Hartmut Geyer who has had a few students continuing on his and Hugh Herr's Muscle-reflex Model from 2010. ...
by Jakob Welner
Tue Nov 24, 2015 3:34 pm
Forum: OpenSim
Topic: Saving and loading complete state of predictive simulation
Replies: 4
Views: 1034

Saving and loading complete state of predictive simulation

I am trying to save the complete state of my system based on PredictiveSim by Dorn et al. in order to use the state as a start-condition in new simulations. I have saved out all inner variables in the controller, each muscle as well as the position and velocity of each limb and I can load them all i...
by Jakob Welner
Mon Nov 16, 2015 4:03 am
Forum: OpenSim
Topic: Python API and initiating double& objects
Replies: 1
Views: 323

Python API and initiating double& objects

I am having troubles initiating a python object for receiving the value from opensim.statevector.getDataValue(index, returnVal) which requires a returnValue og type 'double &aValue'. I have found the opensim.ArrayDouble() method for initiating python array objects, but haven't found anything similar...
by Jakob Welner
Sat Nov 14, 2015 11:24 am
Forum: OpenSim
Topic: Unable to use PiecewiseConstantFunction through the API
Replies: 4
Views: 604

Re: Unable to use PiecewiseConstantFunction through the API

Hi and thank you for your reply. If I write: #include <OpenSim/Common/PiecewiseConstantFunction.h> then it works! Thanks! However, it appears to be a hack that shouldn't be necessary, right? At least when I can access all the other functions without it and I'm curious why this is happening - unless ...
by Jakob Welner
Thu Nov 12, 2015 2:57 pm
Forum: OpenSim
Topic: Unable to use PiecewiseConstantFunction through the API
Replies: 4
Views: 604

Unable to use PiecewiseConstantFunction through the API

Hi, For some reason I cannot seem to use the PiecewiseConstantFunction through the c++ API while I can easily use the PiecewiseLinearFunction. Both header files are there, in the same directory (../simbody/sdk/include/OpenSim/Common), I've checked that my compiler actually looks for the Linear funct...
by Jakob Welner
Thu Nov 12, 2015 10:31 am
Forum: OpenSim
Topic: How to add perturbation forces to FD predictive simulation
Replies: 1
Views: 277

Re: How to add perturbation forces to FD predictive simulati

I think I've solved it now. I ended up using a PrescribedForce as described in the Tug of War example. I generate the perturbation forces randomly for each run, using a PiecewiseLinearFunction to update the PrescribedForce parameters before simulation. This seem to work. Only issue is that I am not ...