Math Problem Statement

Solution

On considère le système SISO d'ordre n associé à la représentation d'état suivante : \( \dot{x} = Ax + Bu \) et \( y = Cx \). 1. Quelles sont les noms et les dimensions des matrices A, B et C ? 2. Donner l'expression de la fonction de transfert (G(p)) du système en fonction de A, B et C.

Solution

The problem is about a Single Input Single Output (SISO) system with a state-space representation. Here's the given information and required tasks:

  1. System Representation: The state-space equations for the system are given by: x˙=Ax+Bu\dot{x} = Ax + Bu y=Cxy = Cx where:

    • xx is the state vector.
    • uu is the input.
    • yy is the output.
    • AA, BB, and CC are matrices defining the dynamics of the system.
  2. Questions:

    • Question 1: Identify the names and dimensions of matrices AA, BB, and CC.
    • Question 2: Determine the transfer function G(p)G(p) of the system in terms of AA, BB, and CC.

Solution:

1. Dimensions of Matrices AA, BB, and CC:

  • AA is the state matrix with dimensions n×nn \times n, where nn is the order of the system (number of state variables).
  • BB is the input matrix with dimensions n×1n \times 1 because there is a single input.
  • CC is the output matrix with dimensions 1×n1 \times n because there is a single output.

2. Transfer Function G(p)G(p):

The transfer function G(p)G(p) of a state-space system can be derived using the formula: G(p)=C(pIA)1BG(p) = C(pI - A)^{-1}B where:

  • pp is the Laplace variable (assuming ss-domain representation).
  • II is the identity matrix of dimension n×nn \times n.

This transfer function expresses the relationship between the input uu and output yy in the frequency domain.

Would you like further details on these steps or more explanations?

Related Questions for Further Understanding:

  1. How do you interpret the role of the matrix AA in the dynamics of the system?
  2. Why is BB called the input matrix, and how does it affect the system’s response?
  3. What does the matrix CC signify in the context of output generation?
  4. Can you explain how the inverse (pIA)1(pI - A)^{-1} is computed and what it represents?
  5. How would you find the poles of this transfer function G(p)G(p)?

Tip:

Understanding state-space representation is crucial for analyzing multi-variable systems, especially in control theory, as it provides a framework to describe system dynamics in a structured form.

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Math Problem Analysis

Mathematical Concepts

Control Theory
Linear Algebra
State-Space Representation
Transfer Function

Formulas

State-space equations: \( \dot{x} = Ax + Bu \) and \( y = Cx \)
Transfer function: \( G(p) = C(pI - A)^{-1}B \)

Theorems

State-Space to Transfer Function Conversion

Suitable Grade Level

University Level