R(s) Second-order System Performance in Feedback Systems KG(s) 1+ KG(s)H(s) R(s) -K| Gc(s) = K G(s) = G(s) H(s) = 1 C(s) H(s) Ex: Sketch all the Closed Loop Roots in the S – Plane for ACLTE(S) For K Varying from Zero to Infinitive 1 (s + 1)(s + 2)(s + 4) C(s) = = 1+ K 0≤k<∞ ACLTF (S) = 1 + KG(s)H(s) T(s) = KG(s) + KG(s)H(s) ACLTF (S) = 1 + KG(s)H(s)

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**Second-order System Performance in Feedback Systems**

---

**Diagram Explanation:**
The diagram displays a block diagram of a feedback system. It consists of the following components:

- **R(s):** Input to the system.
- **K:** Gain block.
- **G(s):** Forward path transfer function.
- **H(s):** Feedback path transfer function.
- **C(s):** Output of the system, with a feedback loop from C(s) to the summing point before K.

The mathematical expression shows the transfer function for the closed-loop system:

\[ C(s) = \left[\frac{KG(s)}{1 + KG(s)H(s)}\right] R(s) \]

The gain \( K \) ranges from \( 0 \leq K < \infty \).

The characteristic equation is given by:

\[ \Delta_{CLTF}(s) = 1 + KG(s)H(s) \]

---

**Example:**

**Objective:** Sketch all the Closed Loop Roots in the S-Plane for \(\Delta_{CLTF}(s)\) for K varying from Zero to Infinite.

---

- **\( G_c(s) = K \):** Controller gain.

- **\( G(s) = \frac{1}{(s+1)(s+2)(s+4)} \):** Transfer function of the plant.

- **\( H(s) = 1 \):** Feedback transfer function.

The closed-loop transfer function is:

\[ T(s) = \frac{KG(s)}{1 + KG(s)H(s)} \]

The characteristic equation remains:

\[ \Delta_{CLTF}(s) = 1 + KG(s)H(s) \]

---

This exercise involves analyzing the roots of the characteristic equation as the gain \( K \) varies from zero to infinity, which is essential for understanding system stability and performance characteristics in control systems.
Transcribed Image Text:**Second-order System Performance in Feedback Systems** --- **Diagram Explanation:** The diagram displays a block diagram of a feedback system. It consists of the following components: - **R(s):** Input to the system. - **K:** Gain block. - **G(s):** Forward path transfer function. - **H(s):** Feedback path transfer function. - **C(s):** Output of the system, with a feedback loop from C(s) to the summing point before K. The mathematical expression shows the transfer function for the closed-loop system: \[ C(s) = \left[\frac{KG(s)}{1 + KG(s)H(s)}\right] R(s) \] The gain \( K \) ranges from \( 0 \leq K < \infty \). The characteristic equation is given by: \[ \Delta_{CLTF}(s) = 1 + KG(s)H(s) \] --- **Example:** **Objective:** Sketch all the Closed Loop Roots in the S-Plane for \(\Delta_{CLTF}(s)\) for K varying from Zero to Infinite. --- - **\( G_c(s) = K \):** Controller gain. - **\( G(s) = \frac{1}{(s+1)(s+2)(s+4)} \):** Transfer function of the plant. - **\( H(s) = 1 \):** Feedback transfer function. The closed-loop transfer function is: \[ T(s) = \frac{KG(s)}{1 + KG(s)H(s)} \] The characteristic equation remains: \[ \Delta_{CLTF}(s) = 1 + KG(s)H(s) \] --- This exercise involves analyzing the roots of the characteristic equation as the gain \( K \) varies from zero to infinity, which is essential for understanding system stability and performance characteristics in control systems.
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