Les Ondes Mécanique Progressives

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Les Ondes Mécanique Progressives

L’onde mécanique : est le phénomène de propagation d'une perturbation dans un milieu matériel élastique sans transport de matière qui forme ce milieu mais avec transport d’énergie.

L’onde mécanique progressive : est une succession continue des signaux mécaniques, résultant d'une perturbation entretenue et continue de la source d’onde.

Onde transversale : est celle dont la direction de la perturbation du milieu est perpendiculaire à la direction de la propagation.

Onde longitudinale : est celle dont la direction de la perturbation du milieu est alignée avec la direction de la propagation.

Le son est une onde mécanique progressive longitudinale se propage dans les milieux matériels (solide et liquide et gaz) et ne se propage pas dans le vide, et il se propage grâce à une compression et une dilatation du milieu de propagation.

Pour un milieu homogène, la célérité d’une onde est constante et indépendante de la forme de la perturbation. Tandis qu’elle dépend de la nature du milieu : son élasticité, son inertie et de sa température.

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