NDLI: Efficient sensitivity analysis and optimization of a helicopter rotor

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Efficient sensitivity analysis and optimization of a helicopter rotor

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lim, Joon W. Chopra, Inderjit
Copyright Year	1989
Description	Aeroelastic optimization of a system essentially consists of the determination of the optimum values of design variables which minimize the objective function and satisfy certain aeroelastic and geometric constraints. The process of aeroelastic optimization analysis is illustrated. To carry out aeroelastic optimization effectively, one needs a reliable analysis procedure to determine steady response and stability of a rotor system in forward flight. The rotor dynamic analysis used in the present study developed inhouse at the University of Maryland is based on finite elements in space and time. The analysis consists of two major phases: vehicle trim and rotor steady response (coupled trim analysis), and aeroelastic stability of the blade. For a reduction of helicopter vibration, the optimization process requires the sensitivity derivatives of the objective function and aeroelastic stability constraints. For this, the derivatives of steady response, hub loads and blade stability roots are calculated using a direct analytical approach. An automated optimization procedure is developed by coupling the rotor dynamic analysis, design sensitivity analysis and constrained optimization code CONMIN.
File Size	513446
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890015784
Archival Resource Key	ark:/13960/t6547mf09
Language	English
Publisher Date	1989-04-01
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Aerodynamic Balance Helicopters Structural Vibration Finite Difference Theory Aircraft Design Hubs Aeroelasticity Optimization Rotary Wings Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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