oscillateur (système masse ressort) Flashcards

1
Q

loi de Hook

A

Felastique = - k (l(t) - lo) uext

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2
Q

équation de l’oscillateur harmonique (ressort à l’horizontal) sans frottement

A

d²x/dt² + ωo²x = ωo² leq (savoir résoudre avec des CI)

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3
Q

Énergie cinétique

A

Ec = 1/2 m v²

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4
Q

Energie potentielle élastique

A

Epe = 1/2 k (l(t) - lo)² + cst

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5
Q

Energie potentielle de pesanteur

A

Epp = +- mgz + cst

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6
Q

Energie mécanique

A

Em = Ep + Ec

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7
Q

Conservation de l’energie mécanique

A

démo

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8
Q

intégrale première de l’Em

A

savoir faire

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9
Q

pulsation propre ωo

A

ωo = √(k/m)

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10
Q

équation diff système masse ressort amorti par frottement fluide linéaires

A

d²z/dt² + ωo/Q dz/dt + ωo² z = ωo² zeq

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11
Q

facteur de qualité Q

A

Q = √(km) /a

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12
Q

régime pseudo périodique

A

Q > 1/2 (connaitre la démo et les solutions)

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13
Q

régime apériodique

A

Q < 1/2 (connaitre la démo et les solutions)

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14
Q

régime critique

A

Q = 1/2 (connaitre la démo et les solutions)

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15
Q

résonance en méca

A

ω = ωr = ωo √(1- 1/2Q²)

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