I’m a new anybody user and am currently working on a model of a car driver which is based on the airline passenger from AMMRV1.2. So far I added a steering wheel to it and connected the person’s hands to it. During my analysis I want to look at muscle activity during several movements of the cervical spine and would need to determine the motion of each vertebra. Obviously C1-C7 are defined (HumanModel.BodyModel.Trunk.SegmentsCervicalSpine) but when changing the neck extension (either in JointsAndDrivers or JntPos), only the skull is moving relative to C1. I was not able to find where to define the 3D position of all other vertebrae. Could anyone tell me where to find it in this model? And how do I define the position over time? Do I just give it a starting and an end point?
I’m looking forward to readin some thaughts about this!
You have to include the TrunkNeck Model, this can be done in the BodyModel file. Then you may have to change some drivers, please have a look at the Freeposture model. In this model a lot of standard drivers (also for the SkullTrunk) are included. The motion can be specified with a simple driver stating start position and velocity of the motion or with more advanced markers like interpolation drivers using data sets (see e.g. http://wiki.anyscript.org/index.php/Tips_and_tricks#Use_a_simple_text_file_to_drive_a_model). But there are even more options, please have a look at the tutorials and the reference manual.
Thank you for your quick and informative reply to my question. The only thing which is not clear to me is where I find the TrunkNeck Model. I wasn’t able to find it in the repository (AMMRV1.2 and version 1.0 of AMMR).
no, you don't have to define the r0. The r0 values are used for inital positioning of the segments. So it may be overruled be any other kinematic contraints you set. What you have to do is to include some more drivers for the Cervical spine. I modified the Airline Passenger model - included the TrunkNeck and some Drivers. You can set the motion of the Cervical spine now in the Mannequin file. I hope this helps.
thank you very much for sending me the modified file. However, I do get an error when trying to load the file:
ERROR(SCR.PRS9) : F:/A…y/A…2/A…n/E…s/A…w/JointsAndDrivers.any : ‘SkullThoraxFlexion’ : Unresolved object