Search found 5 matches

by Zach Lerner
Thu Dec 12, 2013 10:48 am
Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
Topic: GRF data for the right turn trial (Yr5)
Replies: 3
Views: 1092

Re: GRF data for the right turn trial (Yr5)

Hi Allison, We generate our knee joint contact force predictions by applying experimental GRFs to the foot during an inverse dynamic simulation. I now realize that the absence of this data may have been by design to encourage participants to explore alternative approaches...?! I will explore using a...
by Zach Lerner
Tue Dec 10, 2013 8:58 am
Forum: Grand Challenge Competition to Predict In Vivo Knee Loads
Topic: GRF data for the right turn trial (Yr5)
Replies: 3
Views: 1092

GRF data for the right turn trial (Yr5)

Hi Allison, My question is in regards to the Yr5 right turn data. I know you guys have done an excellent job making sure the data is correct and accurate, yet I sill have an issue that someone might help clarify. When I view the GRF data for the right turn trial #6 (PS_rightturn6_grf.xls), I see onl...
by Zach Lerner
Mon Oct 21, 2013 9:08 pm
Forum: OpenSim
Topic: model a cat hindlimb's musculoskeletal system
Replies: 2
Views: 935

Re: model a cat hindlimb's musculoskeletal system

Hi Derya, You will likely need to use a number of different programs to create your cat model. I've recently created a sheep hindlimb model from scratch and am now in the process of refining and validating my work. To create my bone geometry files I used a program called Amira to convert a CT scan o...
by Zach Lerner
Fri Oct 12, 2012 4:04 pm
Forum: OpenSim
Topic: Specifying an OptimizerSystem with Constraints
Replies: 2
Views: 638

Re: Specifying an OptimizerSystem with Constraints

Thanks Sherm, this will be very helpful.
by Zach Lerner
Fri Oct 12, 2012 3:16 pm
Forum: OpenSim
Topic: Specifying an OptimizerSystem with Constraints
Replies: 2
Views: 638

Specifying an OptimizerSystem with Constraints

Using the API, I'd like to implement an OptimizerSystem that specifies both an objective function a constraint function. Using the arm optimization example as a starting point, I've been able to implement a OptimizerSystem with an objective function, but now I'm a bit lost trying to implement the co...