Sharif University of Technology

Department of Aerospace Engineering

Aeroelasticity

Aero-45910

Instructor:

Hassan Haddadpour

Haddadpour@sharif.edu

Description:

This course will address issues related to the mutual interaction of elastic, inertial, and aerodynamic forces with emphasis on aeronautical applications.

Course Objectives:

This course is a collection of special topics in the application of solid and fluid interaction in aerospace area, which is called aeroelasticity. It quantifies the effects of the inertial, structural and aerodynamic parameters that affect divergence, control surface reversal and flutter and calculation of critical speeds for these phenomena for simple wings using steady, and in the case of flutter, unsteady aerodynamic assumptions. 

Prerequisites by Topic:

1. An understanding of aerodynamics (or Fluid Mechanics).
2. An understanding of structural dynamics (or Vibrations).

Syllabus:

1. Introduction to Aeroelasticity

· What is Aeroelasticity?

· Historical Review

2. Static Aeroelasticity

· Divergence of Typical Section

· Control Surface Reversal

· Divergence of 1-D Structures (Straight and Swept Wings)

· Mode Summation Method

· Composite Wings 

3. Aerodynamic Modeling
• Steady Aerodynamic
• Quasi-Steady Aerodynamic
• Unsteady Aerodynamic
4. Dynamic Aeroelasticity

· The Physical Explanation of Flutter

· Lagrange’s Equations

· Stability Analysis and Flutter of Typical Section

· Gust Response

· Flutter of 1-D Structures (Straight and Swept Wings)

· Modal Analysis Method

5. Reduced Order Modeling
• Reduced Order Aerodynamic Model
• Static Correction Technique
• Reduced Order Aeroelastic Model

Course Outcomes:

Students who successfully complete the course will demonstrate the following outcomes.

1. Become conversant in the terminology of aeroelasticity.
2. Enhance understanding of professional and ethical responsibilities by discussion of effects of aeroelasticity on safe design of aerospace vehicles.
3. Improve knowledge of aerodynamics, structure stability and control.
4. Achieve a working understanding of these issues applied to various aerospace structures.
5. Become familiar with the existing commercial aeroelastic software

Grading:

Homework Sets: 20 %

Midterm Exam: 30 %

Project: 15 %

Final Exam: 35 %

Text:

The two main references are:

• Dowell, E. H., Crawley, E. F., Curtiss Jr., H. C., Peters, D. A., Scanlan, R. H., and Sisto, F., A Modern Course in Aeroelasticity, Kluwer Academic Publishers, 3rd Edition, 1995.
• Hodges, D. H. and Pierce, G. A., Introduction to Structural Dynamics and Aeroelasticity, Cambridge Aerospace Series, 2002.

Other References:

• Bisplinghoff, R. and Ashley, H., Principles of Aeroelasticity, Dover, 1962.
• Bisplinghoff, R., Ashley, H., and Halfman, R. L., Aeroelasticity, Dover, 1955.
• Fung, Y. C., An Introduction to the Theory of Aeroelasticity, 1955 (Dover, 1969).
• Scanlan, R. H. and Rosenbaum, Introduction to the Study of Aircraft Vibration and Flutter, The Macmillian Co., 1951.
• Dowell, E. H., Aeroelasticity of Plates and Shells, Noordhoff International Publishing, 1975.