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A second order system is governed by yยจ(t)+2yห™(t)=u(t)๐‘ฆยจ(๐‘ก)+2๐‘ฆห™(๐‘ก)=๐‘ข(๐‘ก). Its transfer function is1s2+21๐‘ 2+21s2โˆ’21๐‘ 2โˆ’21s2+2s1๐‘ 2+2๐‘ 1s2โˆ’2s

Question

A second order system is governed by yยจ(t)+2yห™(t)=u(t)๐‘ฆยจ(๐‘ก)+2๐‘ฆห™(๐‘ก)=๐‘ข(๐‘ก). Its transfer function is1s2+21๐‘ 2+21s2โˆ’21๐‘ 2โˆ’21s2+2s1๐‘ 2+2๐‘ 1s2โˆ’2s

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Solution

It seems like there's a bit of confusion in your question as the transfer function you've provided appears to be a bit jumbled. However, I'll provide a general way to find the transfer function of a second order system.

A second order system is typically represented by the following differential equation:

y''(t) + ay'(t) + by(t) = u(t)

where:

  • y''(t) is the second derivative of the output with respect to time,
  • y'(t) is the first derivative of the output with respect to time,
  • y(t) is the output,
  • u(t) is the input,
  • a and b are constants.

The Laplace transform of this equation is:

s^2Y(s) + asY(s) + bY(s) = U(s)

where:

  • Y(s) is the Laplace transform of y(t),
  • U(s) is the Laplace transform of u(t),
  • s is the complex frequency.

The transfer function, G(s), is the ratio of the output, Y(s), to the input, U(s). So, we can rearrange the above equation to find G(s):

G(s) = Y(s)/U(s) = 1/(s^2 + a*s + b)

So, for your system where a = 2 and there's no y(t) term, the transfer function should be:

G(s) = 1/(s^2 + 2s)

This problem has been solved

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