Search found 24 matches

by Daniel Krueger
Tue Nov 26, 2013 1:29 am
Forum: OpenSim
Topic: Implementation of Static Optimization
Replies: 2
Views: 529

Re: Implementation of Static Optimization

Hey Erik, perhaps the following c++ code may help you: State s=this->model.initSystem(); Storage statesStore; statesStore.setDescription("initial pose sequence"); Array<std::string> stateNames; stateNames=this->model.getStateVariableNames(); stateNames.insert(0, "time"); statesStore.setColumnLabels(...
by Daniel Krueger
Sun Nov 24, 2013 2:16 am
Forum: OpenSim
Topic: Simbody: Linearization of dynamics ?
Replies: 1
Views: 275

Simbody: Linearization of dynamics ?

Hello, I am a researcher in the field of engineering design. My knowledge on multi body dynamics is limited to what is taught in undergraduate lectures. I am using Opensim for virtual ergonomic testing (user-product interaction) which is done employing optimal control. In this context I am intereste...
by Daniel Krueger
Tue Feb 05, 2013 12:52 am
Forum: OpenSim
Topic: Does OpenSim feature full SimTK Core ?
Replies: 4
Views: 501

Re: Does OpenSim feature full SimTK Core ?

Thank you very much, Sherm!
Complex values really make sense...
Regards,
Daniel
by Daniel Krueger
Mon Feb 04, 2013 12:25 am
Forum: OpenSim
Topic: Does OpenSim feature full SimTK Core ?
Replies: 4
Views: 501

Re: Does OpenSim feature full SimTK Core ?

Hi Sherm, thanks for your reply. Here is my code: Matrix H; //matrix of elt <double> //..init matrix H to something Vector d; //also double Matrix V; //also double Eigen e(H); e.getAllEigenValuesAndVectors(d,V); //compute Eigenvalues and -vectors When I try to link this code the following error appe...
by Daniel Krueger
Sun Feb 03, 2013 1:33 am
Forum: OpenSim
Topic: Does OpenSim feature full SimTK Core ?
Replies: 4
Views: 501

Does OpenSim feature full SimTK Core ?

Hello, i have the following problem: within an OpenSim API programm I need to make use of some SimTK linear algebra functions. more precisely I want to compute eigenvalues using SimTK::Eigen class. However as soon as I try to call any methods of this class, I get a link error that says: "unresolved ...
by Daniel Krueger
Tue Nov 20, 2012 1:18 am
Forum: OpenSim
Topic: kinematic constraint forces
Replies: 7
Views: 1890

Re: kinematic constraint forces

Hello Sherm, thank you for your profound reply. Thinking about it again, we came to the same conclusion. I understand that it is hard to find a universally satisfying solution to this problem. Honestly I have no idea what to anwers to your first question. Perhaps one could track the amount of constr...
by Daniel Krueger
Sun Nov 18, 2012 7:49 am
Forum: OpenSim
Topic: kinematic constraint forces
Replies: 7
Views: 1890

kinematic constraint forces

Hello, at our institute we are using OpenSim for ergonomic design studies. Because we are aiming for a completely virtual analysis tool chain, it is not possible to use experimental data in our simulations. Instead motion sequences are computed using constrainted inverse kinematics. However I encoun...
by Daniel Krueger
Tue Nov 06, 2012 12:51 am
Forum: OpenSim
Topic: Creating a customized IK-solver
Replies: 2
Views: 417

Re: Creating a customized IK-solver

By the way: Thank You Ayman for the offer to get the source code! This will solve the coexistence of multiple assemblers.
best regards,
Daniel
by Daniel Krueger
Tue Nov 06, 2012 12:46 am
Forum: OpenSim
Topic: Creating a customized IK-solver
Replies: 2
Views: 417

Re: Creating a customized IK-solver

In the meantime I found a solution for my problem: At the level of simbody it is possible to specifiy custom assembly goals for the kinematic assembler. I already testet it and think it will be useful. The only drawback I see is that an OpenSim:Model always creates its own simbody assembler which ca...
by Daniel Krueger
Wed Oct 31, 2012 3:52 am
Forum: OpenSim
Topic: Creating a customized IK-solver
Replies: 2
Views: 417

Creating a customized IK-solver

Hello, I am looking for a way to perform inverse kinematics of underdetermined systems. In particular i want to use as few constraints (markers) as possible to solve for a suitable set of coordinates. The idea is to use some kind of scalar objective function to determine an optimal solution in the c...