Dynamic verification of a multi-body computational model of human head and neck for frontal, lateral, and rear impacts

Lopik, David W. van; Acar, Memiş

doi:10.1243/14644193jmbd89

Cited by 13 publications

(14 citation statements)

References 16 publications

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“…The first derivatives of Equations (7) and (8), which correspond to the local coordinates of potential contact points, with respect to θ i and θ j give the local components of the vectors tangent to the curves s i and s j at points P i and P j respectively, as illustrated in Figure 5. Therefore, these tangent vectors can be expressed in local coordinates as,…”

Section: Mathematical Modeling Of Knee Jointmentioning

confidence: 99%

“…These, methods are either based on the finite elements analysis [1][2][3][4], or the multibody systems methodologies [5][6][7][8]. The finite element methods provide the system's state of stress and deformation at any time, and are most accurate and versatile, but tend to be very time consuming and require high level of information on the system, which may not be accessible to the common designer, and hence remain confined to research and development.…”

Section: Introductionmentioning

confidence: 99%

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Development of a planar multibody model of the human knee joint

et al. 2009

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International audienceThe aim of this work is to develop a dynamic model for the biological human knee joint. The model is formulated in the framework of multibody systems methodologies, as a system of two bodies, the femur and the tibia. For the purpose of describing the formulation, the relative motion of the tibia with respect to the femur is considered. Due to their higher stiffness compared to that of the articular cartilages, the femur and tibia are considered as rigid bodies. The femur and tibia cartilages are considered to be deformable structures with specific material characteristics. The rotation and gliding motions of the tibia relative to the femur cannot be modeled with any conventional kinematic joint, but rather in terms of the action of the knee ligaments and potential contact between the bones. Based on medical imaging techniques, the femur and tibia profiles in the sagittal plane are extracted and used to define the interface geometric conditions for contact. When a contact is detected, a continuous nonlinear contact force law is applied which calculates the contact forces developed at the interface as a function of the relative indentation between the two bodies. The four basic cruciate and collateral ligaments present in the knee are also taken into account in the proposed knee joint model, which are modeled as nonlinear elastic springs. The forces produced in the ligaments, together with the contact forces, are introduced into the system's equations of motion as external forces. In addition, an external force is applied on the center of mass of the tibia, in order to actuate the system mimicking a normal gait motion. Finally, numerical results obtained from computational simulations are used to address the assumptions and procedures adopted in this study

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Section: Mathematical Modeling Of Knee Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a planar multibody model of the human knee joint

et al. 2009

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“…The completed model has been validated against experimental results, ranging from the individual motion segment response to the dynamic response of the whole head-neck model to frontal, lateral, and rearend impacts [30]. The model has been used to simulate the frontal and lateral sled acceleration tests per-formed at the NBDL using human volunteers [8][9][10].…”

Section: The Multi-body Modelmentioning

confidence: 99%

“…The model has been used to simulate the frontal and lateral sled acceleration tests per-formed at the NBDL using human volunteers [8][9][10]. Good agreement was seen for both impact directions [30]. The model has also been implemented without musculature to simulate bench-top trauma experiments using cadaveric isolated cervical spine specimens.…”

Section: The Multi-body Modelmentioning

confidence: 99%

Viscoelastic finite element analysis of the cervical intervertebral discs in conjunction with a multi-body dynamic model of the human head and neck

Esat

Acar

2008

Proc Inst Mech Eng H

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This article presents the effects of the frontal and rear-end impact loadings on the cervical spine components by using a multibody dynamic model of the head and neck, and a viscoelastic finite element (FE) model of the six cervical intervertebral discs. A threedimensional multi-body model of the human head and neck is used to simulate 15 g frontal and 8.5 g rear-end impacts. The load history at each intervertebral joint from the predictions of the multi-body model is used as dynamic loading boundary conditions for the FE model of the intervertebral discs. The results from the multi-body model simulations, such as the intervertebral disc loadings in the form of compressive, tensile, and shear forces and moments, and from the FE analysis such as the von Mises stresses in the intervertebral discs are analysed. This study shows that the proposed approach that uses dynamic loading conditions from the multi-body model as input to the FE model has the potential to investigate the kinetics and the kinematics of the cervical spine and its components together with the biomechanical response of the intervertebral discs under the complex dynamic loading history.

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“…Thus, dynamic verification of a multi-body computational model of human head and neck for frontal, lateral, and rear impacts has been reported in [7]. Experimental validation of a 3D FE model of pelvic-femur-soft tissue complex under side impact loading can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of two colliding fractionally damped spherical shells in modelling blunt human head impacts

Rossikhin

Shitikova

2013

Open Physics

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Abstract:The collision of two elastic or viscoelastic spherical shells is investigated as a model for the dynamic response of a human head impacted by another head or by some spherical object. Determination of the impact force that is actually being transmitted to bone will require the model for the shock interaction of the impactor and human head. This model is indended to be used in simulating crash scenarios in frontal impacts, and provide an effective tool to estimate the severity of effect on the human head and to estimate brain injury risks. The model developed here suggests that after the moment of impact quasi-longitudinal and quasi-transverse shock waves are generated, which then propagate along the spherical shells. The solution behind the wave fronts is constructed with the help of the theory of discontinuities. It is assumed that the viscoelastic features of the shells are exhibited only in the contact domain, while the remaining parts retain their elastic properties. In this case, the contact spot is assumed to be a plane disk with constant radius, and the viscoelastic features of the shells are described by the fractional derivative standard linear solid model. In the case under consideration, the governing differential equations are solved analytically by the Laplace transform technique. It is shown that the fractional parameter of the fractional derivative model plays very important role, since its variation allows one to take into account the age-related changes in the mechanical properties of bone. PACS

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Dynamic verification of a multi-body computational model of human head and neck for frontal, lateral, and rear impacts

Cited by 13 publications

References 16 publications

Development of a planar multibody model of the human knee joint

Development of a planar multibody model of the human knee joint

Viscoelastic finite element analysis of the cervical intervertebral discs in conjunction with a multi-body dynamic model of the human head and neck

Analysis of two colliding fractionally damped spherical shells in modelling blunt human head impacts

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