Projet ANR : SoHuSim

Project description


SoHuSim deals with the problem of the modeling and the simulation of soft interaction between humans and objects. At the moment there is nos software capable of modeling the physical behaviot of human's soft tissues (muscles, fat, skin) in mechanical interaction with the environment. The existing software such as LifeMod or OpenSim, models muscles as links of variable length and applying a force to an articulated stiff skeleton. The management of soft tissues is not taken into account and does not constitute the main objective of this software.

A first axis of this project aims at the simple modeling and the simulation of a passive human manipulated by a mecatronics device with for objective the study and the systems design of patient's manipulation with very low mobility (clinic bed). The second axis concentrates on the detailed modeling and the simulation of the interaction of an active lower limb with objects like orthesis, exoskeleton, clothes or shoes. The objective being there also to obtain a tool for design of devices in permanent contact with the human who allows determining the adequate ergonomics in terms of forms, location, materials, according to the aimed use.

Problems in this project are situated at the level of the modeling of "soft materials" in interaction with diverse objects. The "soft materials" which we intend to model can be artificial materials such as the silicone or natural one such as latex. These materials can constitute homogeneous objects (ex: full rubber ball) or heterogeneous (ex: foam of silicone containing micro air bubble), we can envisage the modeling of inflatable structures. Besides the inert soft materials, we also envisage and especially the modeling of the human at the level of his alive organic tissues (muscle, fat). This level of modeling will require a coupling with data from medical images of MRI type to be the most similar possible with the considered human. The modeling of muscles will have to consider the active character of this organic tissue. These soft organic structures will thus have variable properties for example in terms of shape or stiffness. The modeling of the deformations and the phenomena of friction will be an important aspect of the project. The appropriate function of muscles being the mobility, the interaction with the skeleton and its consequences at the posture level and the movements of the modeled human must be considered by the implementation of biomechanical models. This modeling / simulation of soft tissues will constitute a real step ahead in the field of the simulation of the humans. This will allow, to study the behavior of soft tissues in interaction with the environment on aspects patient's manipulation, to simulate the effects of prolonged pressure forces, to predetermine the zones of excessive frictions, formation of bedsores and hurts linked to the use of objects. The dynamic aspects of its simulations will allow studying the energies involvement during phases of movements of the current life. Tools developed in this project will have vocation to be integrated, in the form of module, into software of computer-aided design (CAD).

Figure: Anatomical reconstruction personalized to the hip by registration

Figure: Physical simulation by composite FEM

Figure: Problem of bedsores and manipulation of a human body

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