AS25402 Introduction to Control Theory – Semester IV – Aerospace – R-2025

Subject Code & Name: AS25402 – Introduction to Control Theory

Regulation: R-2025

Semester: IV (Fourth Semester)

Branch: B.E. Aerospace Engineering (Aerospace)

Credits / L-T-P: 3 Credits | L-T-P: 3-0-0

Course Objectives

• To introduce the fundamental concepts of control systems, mathematical modelling, and system analysis techniques.
• To enable evaluation of system performance and stability, and to design controllers and compensators using analytical and simulation tools.

Full Unit-wise Syllabus

The official syllabus lists this course as four untitled topic blocks; the unit headings below are descriptive labels added for readability.

Unit I – Introduction and Mathematical Modelling of Control Systems

Introduction to control systems, examples of control systems, types of control systems, transfer function and impulse-response function, automatic control systems, modelling in state space, state-space representation of scalar differential equation and transfer-function systems, mathematical modelling of mechanical, electrical, fluid and thermal systems, transfer function from block diagram and signal flow graphs.

Unit II – Transient and Steady State Response Analyses

First and second order systems response on step, ramp and impulse signals, transient response specifications, stability analysis, Routh stability criteria and application in control systems, introduction to PI, PD and PID controllers, introduction to Root-Locus technique, construction of root loci, steady state errors.

Unit III – Frequency Domain Analysis

Frequency domain analysis, bode plots, polar plots, Nyquist stability criterion, stability analysis, relative stability analysis, Introduction to lead, lag and lag-lead compensations in transient and frequency domain responses.

Unit IV – Computational Tool Exercises

Computational tool exercises for transformation of mathematical models, transient-response analysis, root loci, bode plot.

Course Outcomes (COs)

• CO1: Explain the fundamental concepts of control systems, system modelling, transfer functions, time response, stability methods, and frequency domain techniques.
• CO2: Apply control theory principles to compute system models, determine transient/steady-state responses, and analyze stability using analytical methods.
• CO3: Analyze system behavior using block diagrams, signal flow graphs, root locus, and frequency response methods to interpret system performance.
• CO4: Evaluate system stability and performance using Routh criteria, Nyquist plots, and Bode diagrams, and assess controller effectiveness.

Assessment Pattern (Quick Note)

• Weightage: Continuous Assessment 40% | End Semester Examinations 60%
• Internal methodology: Quiz (5%), Assignments (25%), Review of GATE/ESE Questions (20%), Internal Examinations (50%)

Source: Official Anna University – B.E. Aerospace Engineering R-2025 Syllabus
Last Updated: October 2026