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Ejercicios de segundo orden mediante ecuaciones diferenciales

S

Ξ± < Wo Subamortiguado

L=0.1H

C=5uF

R=200Ὡ Wo =

1 ξ𝐿𝐢

Wo =1414.2

1414

Ξ²= ΞΎπ‘Šπ‘œ βˆ’ Ξ±2

𝑅

α = 2𝐿

Ξ± = 1000

Ξ’= 1000

i(t)= eβˆ’Ξ±t (A1 COS Ξ²t + A2 SEN Ξ²t)

t=0

0= A1 COS 1000t + A2 SEN 1000t

0= A1

𝑑𝑖(𝑑) 𝑑𝑑

= eβˆ’1000t (A1 COS 1000t + A2 SEN 1000t)

𝑑𝑖(𝑑) 𝑑𝑑

= eβˆ’1000t (A1 COS 1000t) +eβˆ’1000t (A2 SEN 1000t)

𝑑𝑖(𝑑)

= eβˆ’1000t (A1 COS 1000t) +eβˆ’1000t (A2 SEN 1000t)

𝑑𝑑

𝑑𝑖(𝑑)

= (eβˆ’1000t )Β΄ (A1 COS 1000t) +(eβˆ’1000t )(A1 COS 1000t)Β΄ +

𝑑𝑑 βˆ’1000t Β΄

) (A2 SEN 1000t) + (eβˆ’1000t ) (A2 SEN 1000t)Β΄

(e

𝑑𝑖(𝑑)

𝑑𝑑

= (βˆ’1000eβˆ’1000t )(A1 COS 1000t) +(eβˆ’1000t )(-A1 SEN

1000t)(1000) + (βˆ’1000eβˆ’1000t ) (A2 SEN 1000t) + (eβˆ’1000t ) (A2 COS 1000t)(1000) t=0

0=

𝐿𝑑𝑖(𝑑)

𝑑𝑑

𝐿𝑑𝑖(𝑑) 𝑑𝑑 𝑑𝑖(𝑑) 𝑑𝑑

+ VR + Vc

= -Vc 𝑉𝑐

=-𝐿

𝑑𝑖(𝑑) 𝑑𝑑

= -2000

-2000 = 1000 A2 – 1000 A1 A2 = -2 i(t) = -2(eβˆ’1000t )SEN 1000t [A]

Ejercicios de segundo orden mediante ecuaciones diferenciales

Ξ± > Wo

V

Subreamortiguado

L=0.1H

C=100uF

R=200Ὡ

Wo =

1 ξ𝐿𝐢

Wo =316.22 1414

Ξ²= ΞΎπ‘Šπ‘œ2 βˆ’ Ξ±2

𝑅

α = 2𝐿

Ξ± = 1000

Ξ’= 948.68

i(t)= A1es1t + A2es2t

S1= - Ξ± + Ξ² = - 51.32 S1= - Ξ± - Ξ² = - 1948.68 i(t)= A1eβˆ’51.3t + A2eβˆ’1948.68t

0= A1 + A2

t=0

𝑑𝑖(𝑑) 𝑑𝑑

= - 51.3 A1eβˆ’51.3t – 1948.68 A2eβˆ’1948.68t

200 = VR + Vc +

𝐿𝑑𝑖(𝑑) 𝑑𝑑

𝑑𝑖(𝑑)

𝑑𝑑

= 2000

2000 = - 51.3 A1 – 1948.68 A2 Aplicando sistema de ecuacines nos queda

A1 = 1.054

A2 = - 1.054

i(t)= 1.054 A1eβˆ’51.3t – 1.054 A2eβˆ’1948.68t

Ejercicios de segundo orden mediante ecuaciones diferenciales

Ξ± = Wo

V

Criticamente

L=0.1H

amortiguado C=100uF

R=200Ὡ 1

π‘Šπ‘œ2 = 𝐿𝐢

1

C = πΏπ‘Šπ‘œ2

C = 10 uF

𝑅

α = 2𝐿

Ξ± = 1000

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