MECH 371 Lab #3 (Experiment 3: Time Response Of Basic Closed-Loop System And Effect Of Tachometer Feedback) Concordia University

MECH 371 Lab #3 (Experiment 3: Time Response Of Basic
Closed-Loop System And Effect Of Tachometer Feedback) 2025-
2026 Concordia University

Experiment 3:
Time Response Of Basic
Closed-Loop System And
Effect Of Tachometer Feedback




Submitted by




Lab Section AI – X
Fall 2025
Professor Wen-Fang Xie




Concordia University
Montreal, QC, Canada

,Table Of Contents
Table Of Contents ................................................................................... 2
List of Figures........................................................................................ 3
List of Tables ........................................................................................ 3
Objective ............................................................................................ 4
Introduction ......................................................................................... 4
Procedure ........................................................................................... 4
Exp 1 – Basic closed-loop (no tacho) ........................................................... 4
Exp 2 – With tachometer feedback: ............................................................. 4
Exp – “Best“ time response: ...................................................................................................... 5
Results ............................................................................................... 5
Exp 1 ............................................................................................... 5
Exp 2 ............................................................................................... 7
Exp 3 ............................................................................................... 9
Sample Calculations ........................................................................... 10
Equations ..................................................................................... 10
Exp 1 .......................................................................................... 10
Exp 2 .......................................................................................... 10
Exp 3 .......................................................................................... 11
Matlab ........................................................................................... 12
Discussion ......................................................................................... 14
Exp 1 ............................................................................................. 14
Exp 2 ............................................................................................. 14
Exp 3 ............................................................................................. 14
Sources of Error ................................................................................ 14
Conclusion......................................................................................... 15
References ........................................................................................ 16

, List of Figures
Figure 1: K1 = 0.1 ............................................................................................................................ 5
Figure 2: K1 = 0.2 ............................................................................................................................ 6
Figure 3: K1 = 0.3 ............................................................................................................................ 6
Figure 4: K1 = 0.4 ............................................................................................................................ 7
Figure 5: K2 = 0.1 ............................................................................................................................ 8
Figure 6: K2 = 0.2 ............................................................................................................................ 8
Figure 7: 10% Overshoot K1 = 0.11, K2 = 0 ................................................................................... 9
Figure 8: No Overshoot K1 = 1, K2 = 0.3 ........................................................................................ 9
Figure 9: Simulink Model ............................................................................................................. 12
Figure 10: 10% Overshoot Simulation .......................................................................................... 12
Figure 11: 20% Overshoot Simulation .......................................................................................... 13




List of Tables
Table 1: Experiment 1 Data with K2 = 0 ........................................................................................ 5
Table 2: Experiment 1 Calculated Values ....................................................................................... 5
Table 3: Experiment 2 Data with K1 = 1 ........................................................................................ 7
Table 4: Experiment 2 Calculated Values ....................................................................................... 7
Table 5: Experiment 3 Data ............................................................................................................ 9