I need help with some definitions.

Q1. in seated human model, there are 4 variables as below:

//Strenght of the support muscles between the human and the chair
AnyVar SeatSupportStrength=10000;
AnyVar BackrestSupportStrength=10000;
AnyVar FootrestSupportStrength=10000;
AnyVar ArmrestSupportStrength=10000;

what do these values represent, how these values can be known?

Q2. what are the differences between Leg and LegTD models?what are the usages for each one?

Best Regards,

Hi Zayd,

  1. Contact conditions share the property with muscles that they are unilateral, and therefore we create contact conditions in AnyBody models using a special kind of muscle elements, AnyGeneralMuscle. Please refer to the muscle modeling tutorial for more information about these. The strengths you are referring to are the strengths of these muscles.

In principle, the chair support is infinitely strong, so you want a high strength of these muscles compared with the anatomical muscles. On the other hand, even contact forces are limited by cushion elasticity and/or the allowable pressure on the skin, and this might limit the strength you should specify.

  1. The Leg model is the “old” lower extremity model of the repository building on data by Scott Delp and modified on some points. It is a relatively simple model but probably okay for many purposes. The LegTD model is much more detailed and from a newer cadaver study by Klein Horsman et al.

Best regards,