2. Find the solution of the initial value problem y² + 4y = g(t) = { 16 0 4. y"+by+cy=gi(t); y(0) = a, on interval 0 < t < to obtain the solution, say, y(t). (7) y"+by+cy=92(t); (-) y'(0) B Then you can solve the IVP ✓(7) = × (7) on interval t > to obtain the solution, say, y2(t). (You are able to evaluate y₁ (7) and y(), the initial values at t = 4, since you have obtained y₁ (t) already.) The solution of the original IVP then is <= 4/1 y(t) = { ½(t), + > 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
2. Find the solution of the initial value problem
y" + 4y = g(t) = {
16 0<t<
£24
0
using
(a) a method (without Laplace transform) given in Chapter 3 or 4,
(b) the Laplace transform.
where
"
Hint: The methods in Chapter 3 or 4 can be used to solve the nonhomogeneous
equation with piecewise continuous right-hand side function. Here is the basic idea.
Consider the initial value problem:
y"+ay+by = g(t); y(0) = a, y(0) = ß,
You may first solve the IVP
y(0) = 0, /(0) = 0
0<t<
g(t) = { 92(t), t> 4.
y"+by+cy=92(t); (-)
y"+by+cy=gi(t);
y(0) = a,
on interval 0 < t < to obtain the solution, say, y(t).
= 4/1
y(t) = { ½h(t), t>
(7) ✓(7) =« (7)
on interval t > to obtain the solution, say, y2(t). (You are able to evaluate y₁ (4)
and y(), the initial values at t = 4, since you have obtained y₁ (t) already.) The
solution of the original IVP then is
y'(0) B
Then you can solve the IVP
0<t<
RY
Transcribed Image Text:2. Find the solution of the initial value problem y" + 4y = g(t) = { 16 0<t< £24 0 using (a) a method (without Laplace transform) given in Chapter 3 or 4, (b) the Laplace transform. where " Hint: The methods in Chapter 3 or 4 can be used to solve the nonhomogeneous equation with piecewise continuous right-hand side function. Here is the basic idea. Consider the initial value problem: y"+ay+by = g(t); y(0) = a, y(0) = ß, You may first solve the IVP y(0) = 0, /(0) = 0 0<t< g(t) = { 92(t), t> 4. y"+by+cy=92(t); (-) y"+by+cy=gi(t); y(0) = a, on interval 0 < t < to obtain the solution, say, y(t). = 4/1 y(t) = { ½h(t), t> (7) ✓(7) =« (7) on interval t > to obtain the solution, say, y2(t). (You are able to evaluate y₁ (4) and y(), the initial values at t = 4, since you have obtained y₁ (t) already.) The solution of the original IVP then is y'(0) B Then you can solve the IVP 0<t< RY
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