Several investigations have revealed that long-term exposure to whole-body vibrations can induce low back pain.
In analogy to materials handling, the health risk can be assessed if the forces transmitted in the spine during vibration are known.
To estimate the forces a biomechanical model has been developed in which the human trunk, neck, head and arms are represented by 16 rigid bodies.
An additional body simulates the vibrating seat.
The bodies are connected by visco-elastic joint elements, and 56 force elements imitate the trunk and neck muscles.
The motion equations are derived by means of the dynamics of systems of rigid bodies, and the motions are simulated in three directions.
The frequency-response functions between the accelerations of the seat and the head satisfactorily correspond to data reported in the literature.
The spine forces are composed of a static part, due to body posture, and a vibration-induced part.
The relation between the oscillating parts of the forces transmitted from seat to pelvis and the spine forces are also described by frequency-response functions.
To assess the health risk the simulated spine forces must be compared with the strength of the spine, bearing in mind that this is dependent on the number of load cycles.
Mots-clés Pascal : Modèle 3 dimensions, Biomécanique, Réponse système, Corps entier, Homme, Simulation, Vibration, Colonne vertébrale, Système ostéoarticulaire, Caractéristique fréquentielle, Mesure force
Mots-clés Pascal anglais : Three dimensional model, Biomechanics, System response, Whole body, Human, Simulation, Vibration, Vertebral column, Osteoarticular system, Frequency characteristic, Force measurement
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0020970
Code Inist : 002A24. Création : 31/05/1999.