A second order system is governed by yยจ(t)+2yห(t)=u(t)๐ฆยจ(๐ก)+2๐ฆห(๐ก)=๐ข(๐ก). Its transfer function is1s2+21๐ 2+21s2โ21๐ 2โ21s2+2s1๐ 2+2๐ 1s2โ2s
Question
A second order system is governed by yยจ(t)+2yห(t)=u(t)๐ฆยจ(๐ก)+2๐ฆห(๐ก)=๐ข(๐ก). Its transfer function is1s2+21๐ 2+21s2โ21๐ 2โ21s2+2s1๐ 2+2๐ 1s2โ2s
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)
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