Nonlinear dynamics in the modeling of helicopter rotor blade lead/lag motion
King, Robert L.
Wood, E. Roberts
MetadataShow full item record
Until recently, computer simulations of helicopter rotor dynamics have employed equations of motion that have been linearized or simplified. These modified equations of motion did not allow for the evaluation of nonlinear material properties in the rotor since higher order terms in the dynamics had been modified in the simplification process. With recent advances in both computer simulation hardware and symbolic mathematic manipulation software, the full nonlinear equations of motion may be utilized in helicopter rotor simulations. This dissertation reports on the use of the full nonlinear equations of motion in the analysis of rotor blade lead/lag motion and its effect on rotor hub and rigid body fulselage motion. Nonlinear modeling methods are implemented using Maple symbolic mathematic manipulation software and Matlab and Simulink computer simulation environments. Results are compared to the RAH- 66 Comanche Froude scale wind tunnel article and new methodologies evaluated in the search for a damperless rotor system that is free of ground and air resonance mechanical instabilities
Showing items related by title, author, creator and subject.
Full nonlinear simulation of helicopter coupled rotor-fuselage motion using MATLAB Symbolic processor and dynamic simulation Weissenfels, Robert D. (Monterey, California. Naval Postgraduate School, 2000-03);This thesis formulates the full nonlinear equations of motion for determining the stability of helicopter coupled rotor-fuselage motion utilizing MATLAB(registered)'s Symbolic Math Toolbox. Using the extended symbolic ...
Modeling the coupled rotor/fuselage response of the H-3 Sea King utilizing the NPS full nonlinear response Rafanello, Salvatore P. (Monterey, California: Naval Postgraduate School, 1999-03);Adapting the Naval Postgraduate School full nonlinear simulation model of coupled rotor/fuselage response to the 11-3 Sea King, the concentration of this work rests on validating the rotor simulation against an actual ...
Simulation validation and flight prediction of UH-60A Black Hawk helicopter/slung load characteristics Tyson, Peter H. (Monterey, California: Naval Postgraduate School, 1999-03);Helicopter/slung load systems are two body systems in which the slung load adds its rigid body dynamics, aerodynamics, and sling stretching dynamics to the helicopter. The slung load can degrade helicopter handling qualities ...