Rotorcraft Dynamics and Aeroelasticity
School of Aerospace Engineering
Georgia Institute of Technology
Profs. Dewey H. Hodges and J. V. R. Prasad
Prof. Hodges’ Office: Weber 200-C; Phone: 404-894-8201
Prof. Prasad’s Office: Knight 421-A; Phone 404-894-3043
Time and place: The class hours are 9:30-10:45 a.m., Mondays and Wednesdays. The place is Guggenheim 246.
Text: There is no required text for the course. The following textbooks contain a lot of relevant material and are references for the course content:
- Bielawa, Richard L.: Rotary Wing Structural Dynamics and Aeroelasticity, 2nd edition, AIAA, Reston, Virginia, 2006.
- Bramwell, Anthony R. S.; Done, George T. S.; Balmford, David: Bramwell’s Helicopter Dynamics, 2nd edition, Butterworth-Heinemann, Oxford, 2001.
- Hodges, Dewey H.: Nonlinear Composite Beam Theory, AIAA, Reston, Virginia, 2006.
- Johnson, Wayne: Helicopter Theory, Princeton University Press, Princeton, New Jersey, 1980 (also Dover Publications, Inc., New York, 1994).
- Johnson, Wayne: Rotorcraft Aeromechanics, Cambridge University Press, Boston, Massachusetts, 2012.
Course Goals: To introduce students to the fundamentals of rotorcraft dynamics and aeroelasticity, and to provide necessary background to equip students to do additional research and analysis in the field.
- Prof. Hodges’ Office hours: Tuesdays, 1:00 – 2:30 p.m., and Thursdays, 1:30 – 3:00 p.m.
- Prof. Prasad’s Office hours: tba
- Prof. Hodges’ portion of the course: Homework counts as 100%. Discussion of homework solutions among students is permitted, but the work you turn in must be entirely your own.
- Prof. Prasad’s portion: Homework counts as 70%. Project counts as 30%. Discussion of homework and project among students is permitted, but the work you turn in must be your own.
- Prof. Hodges’s portion (Jan. 7-Feb. 25, 2019)
- Prof. Prasad’s portion (Feb. 27-Apr. 22, 2019): see Prof. Prasad’s web page
Prof. Hodges’s problems:
For Prof. Prasad’s problems, see his web page
Handouts: for Prof. Prasad’s handouts, see his web page
- Ormiston and Hodges (1972)
- Blade dynamics
- Flap-lag potential energy
- Potential energy contribution to pitch-lag coupling terms
- Handwritten flap-lag derivation
- Flap-lag perturbation (for pitch-lag coupling)
- Discussion of flap-lag stability
- Rotating beam derivation
- Transfer matrix method
- Ground resonance
- Ground resonance (handwritten)
- Special cases
- Hodges and Dowell (1974)
- Nonlinear Theory for Composite Blades