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Aeromechanical stability analysis of a multirotor vehicle model representing a hybrid heavy lift airship (HHLA)Hybrid Heavy Lift Airship (HHLA) is a proposed candidate vehicle aimed at providing heavy lift capability at low cost. This vehicle consists of a buoyant envelope attached to a supporting structure to which four rotor systems, taken from existing helicopters are attached. Nonlinear equations of motion capable of modelling the dynamics of this coupled multi-rotor/support frame/vehicle system have been developed. Using these equations of motion the aeroelastic and aeromechanical stability analysis is performed aimed at identifying potential instabilities which could occur for this type of vehicle. The coupling between various blade, supporting structure and rigid body modes is identified. Furthermore, the effects of changes in buoyancy ratio (Buoyant lift/total weight) on the dynamic characteristics of the vehicle are studied. The dynamic effects found are of considerable importance for the design of such vehicles. The analytical model developed is also useful for studying the aeromechanical stability of single rotor and tandem rotor coupled rotor/fuselage systems.
Document ID
19840048925
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Venkatesan, C.
(California Univ. Los Angeles, CA, United States)
Friedmann, P. P.
(California, University Los Angeles, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Aircraft Stability And Control
Report/Patent Number
AIAA PAPER 84-0987
Accession Number
84A31712
Funding Number(s)
CONTRACT_GRANT: NAG2-116
Distribution Limits
Public
Copyright
Other

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