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Nadir Arada - (Cálculo Numérico) - Portal de docentes FCT/UNL

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Problema <strong>de</strong> Cauchy Derivada numérica Aproximação Euler Estabilda<strong>de</strong> Runge-Kutta 2 Runge-Kutta 4<br />

Exemplo 1. Consi<strong>de</strong>re o seguinte problema <strong>de</strong> Cauchy<br />

<br />

′ 2 y (t) = − 5 y(t) + sin (5t) t ∈ [0, 5.5]<br />

y(0) = 5<br />

cuja (única) solução é<br />

y(t) = 3270<br />

2<br />

629<br />

e− 5 t + 10<br />

125<br />

629 sin (5t) − 629 cos (5t)<br />

O método <strong>de</strong> Euler progressivo associado a este problema escreve-se<br />

⇐⇒<br />

ui+1−ui<br />

h<br />

2 = − 5ui + sin (5ti) i = 0, 1, · · · , n − 1<br />

u0 = 5<br />

<br />

ui+1 = 1 − 2<br />

5h ui + h sin(5ih) i = 0, 1, · · · , n − 1<br />

u0 = 5<br />

<strong>Cálculo</strong> <strong>Numérico</strong> - Équações diferenciais ordinárias

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