By Philippe de Larminat

ISBN-10: 1905209355

ISBN-13: 9781905209354

Automation of linear structures is a primary and crucial concept. This ebook offers with the idea of continuous-state computerized platforms.

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Example text

X ( f o ) is then finite, or infinite if x(t ) is also a harmonic signal and X ( f ) is then characterized by a Dirac impulse δ ( fo ) ( f ) . According to the nature of the signal considered, by using various mathematical theories concerning the convergence of indefinite integrals, we can define the Fourier transform in the following cases: – positively integrable signal: ∫ x(t) dt ≤ ∞ . The integral definition of the TF converges in absolute value. X ( f ) is a function that tends toward 0 infinitely; – integrable square signal or finite energy signal ∫ x(t )2 dt ≤ ∞ .

Based on the value of ξ with respect to 1, the transfer function poles have a real or complex nature and the unit-step response looks different. ξ > 1 : the transfer function poles are real and the unit-step response has an aperiodic look (without oscillation): ( ⎛ ⎛ − ξ + ξ 2 −1 ⎜ 1 i(t ) = K ⎜ 1 − ⎜⎜ (1 − a) e ⎜ 2⎜ ⎝ ⎝ where a = ) Tt 0 ( + (1 + a) e − ξ − ξ 2 −1 ) Tt ⎞⎟ ⎞⎟ ξ ξ 2 −1 The tangent at the origin is horizontal. 19. Unit-step response of the second order system ξ ≥ 1 ξ = 1 : critical state.

Serial association Hence y 3 ( _ ) = h3 ( _ ) * (h2 ( _ ) * (h1 ( _ ) * x1 ( _ ) )) . This leads, in general, to a rather complicated expression. e. the simple product of three basic transfer functions. The interest in this characteristic is that any processing or transmission chain basically consists of an association of “basic blocks”. 2. 9. 10. Loop structure H( _ ) = H1( _ ) Y( _ ) = E( _ ) 1 + H 1 ( _ ) × H 2 ( _ ) The term 1 + H 1 ( _ ) × H 2 ( _ ) corresponds to the return difference, which is defined by 1 – (product of loop transfers).

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Analysis and control of linear systems by Philippe de Larminat


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