6. Consider the tachometer system shown below. R(s) 1 S Iin (s) 16 (s+0.8) k Y(s) a) Find the closed loop transfer function Y(s)/R(s) and determine the value of k such that the damping ratio of the poles of this transfer function is 0.5. b) For this value of k, find the rise time tr, maximum overshoot, and settling time ts, if R(s) is a unit step.

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## Problem 6: Tachometer System Analysis

**System Description:**

Consider the tachometer system shown in the block diagram. This system includes:

- An input \( R(s) \).
- A block with transfer function \( \frac{1}{s} \).
- A summing junction where the input is added to a feedback loop.
- A forward path with transfer function \( \frac{16}{s+0.8} \).
- A feedback loop including a gain \( k \).
- An output \( Y(s) \).

**Tasks:**

a) **Closed-Loop Transfer Function:**
   - Determine the closed-loop transfer function \( \frac{Y(s)}{R(s)} \).
   - Find the value of \( k \) such that the damping ratio of the poles is 0.5.

b) **System Characteristics for the Obtained \( k \):**
   - Calculate the rise time \( t_r \).
   - Determine the maximum overshoot.
   - Find the settling time \( t_s \), assuming \( R(s) \) is a unit step input.

**Diagram Explanation:**
- The system has two main branches. The forward path has an integrator block \( \frac{1}{s} \), and the feedback loop introduces a gain \( k \).
- The forward path also has a transfer function of \( \frac{16}{s+0.8} \) after the summing junction.
- Feedback is applied to the input through the gain block, influencing system stability and response characteristics.
Transcribed Image Text:## Problem 6: Tachometer System Analysis **System Description:** Consider the tachometer system shown in the block diagram. This system includes: - An input \( R(s) \). - A block with transfer function \( \frac{1}{s} \). - A summing junction where the input is added to a feedback loop. - A forward path with transfer function \( \frac{16}{s+0.8} \). - A feedback loop including a gain \( k \). - An output \( Y(s) \). **Tasks:** a) **Closed-Loop Transfer Function:** - Determine the closed-loop transfer function \( \frac{Y(s)}{R(s)} \). - Find the value of \( k \) such that the damping ratio of the poles is 0.5. b) **System Characteristics for the Obtained \( k \):** - Calculate the rise time \( t_r \). - Determine the maximum overshoot. - Find the settling time \( t_s \), assuming \( R(s) \) is a unit step input. **Diagram Explanation:** - The system has two main branches. The forward path has an integrator block \( \frac{1}{s} \), and the feedback loop introduces a gain \( k \). - The forward path also has a transfer function of \( \frac{16}{s+0.8} \) after the summing junction. - Feedback is applied to the input through the gain block, influencing system stability and response characteristics.
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