Week 10

Tutorial 10: Fourier Series

Question PDF

TUTORIAL 10-QUESTION Fourier Series-2018-19 Sem 2 V3.pdf

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Written Solution

CamScanner 05-27-2022 09.47.pdf

1289.9KB

Find the fundamental period of the following function:

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Solution

Question (a)

Question (b)

Question (c)

Question (d)

Sketch the given function and find the Fourier Series.

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Solution

Question (a)

Question (b)

Question (c)

Even and Odd Functions. Sketch the given functions, . Determine whether it is an even, odd or neither odd nor even. For part (a) and (b), find the appropriate Fourier Cosine or Fourier Sine Series.

(Do not find the Fourier Series for 3c)

(Do not find the Fourier Series for 3d)

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Solution

Question (a)

Since is an even function, we expand in a cosine series:

Thus,

Question (b)

It is an odd function →

Question (c)

Even function

Question (d)

Neither odd or even

Solve the following questions:

a. Obtain the Fourier series for a periodic function with period :

b. Obtain the Fourier series for a periodic function with period :

c. Differentiate the Fourier series in (a) to obtain

d. Find the Fourier series of by using result in part (c) and compare it with (b).

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Solution

Question (a)

Since is an even function,

Question (b)

since . Thus, it is an odd function.

Question (c)

Question (d)

The answer obtained by differentiation is faster and the answer is the same as 4(b).

Consider the following ODE which represents an undamped mass-spring system:

where is a periodic function as shown in Fig. 1. Obtain a particular solution for the ODE.

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Solution

We expand as an odd function.

We assume a particular solution of the form