Rotorcraft Design IISpring 2003ExamReviewI. Structural Design1. Understand the various design flight speeds and gross weights used in structural design2. Understand what are the critical flight loading conditions normally considered in the design of a pure helicopter3. Understand some of the critical variable parameters which enter into the determination of fatigue life4. Given a flight condition spectrum and loads for fatigue analysis be able to calculate the safe life of a component using Minor’s Cumulative Damage Hypothesis5. Understand what a V-n Diagram is and the various symmetrical and asymmetrical maneuvers that are used to verify it6. Understand Design Limit Landing Requirements7. Understand Reserve Energy Requirements and Design Conditions8. Understand Crash Loads and Structural Design Considerations9. For structural substantiation of rotor, drive and control systems understand:i. Rotor Loads – Steady and Unsteadyii. Analytical Approach to Rotor Load Prediction and Preliminary Design Considerationsiii. For mechanical drive system loads understand the type of loads considerediv. For control system substantiation understand description of load sources and reactions10. For airframe structural substantiation understand the steps in determining loads for the fuselageII. Stability and Control Design1. Understand the components that constitute advanced flight control technology2. Understand the elements included in a flying qualities approach during preliminary design3. Understand the Cooper-Harper rating scale which provides a definition of flying quality levels4. In flying qualities development understand what elements constitutes flight control law requirements and what elements are included in the vehicle configuration5. Understand the flow path from mission requirements to mission performance and what elements of flying qualities are included in this flow path6. Understand the basic differences between mechanical, fly-by-wire, and fly-by-optics flight control systems7. Understand the flight control functional elements8. Understand what constitutes a primary flight control system and an automatic flight control system9. Understand a basic root-locus plot and how stability is determined10. Understand configurations that side-arm controllers can come inIII. Rotorcraft Dynamics Design Considerations1. For blade dynamics understand blade frequency placement on a fan plot2. Understand how the rotor acts as a filter for rotor vibratory forces transmitted from the rotating to the fixed system3. Understand the basic steps required for coupled blade-fuselage response analysis4. Understand different types of vibration control devices5. Understand Ground Resonance and the Deutsch stability criteria6. Understand considerations for selection during preliminary design of the following rotor parameters:i. Disk loadingii. Blade loadingiii. Blade tip Mach number and advance ratioiv. Number of bladesv. Blade twistvi. Airfoil