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Record 35 of 1373
Aeromechanical stability analysis of a multirotor vehicle model representing a hybrid heavy lift airship (HHLA)
Author and Affiliation:
Venkatesan, C.(California Univ., Los Angeles, CA, United States)
Friedmann, P. P.(California, University, Los Angeles, CA, United States)
Abstract: 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.
Publication Date: Jan 01, 1984
Document ID:
19840048925
(Acquired Nov 28, 1995)
Accession Number: 84A31712
Subject Category: AIRCRAFT STABILITY AND CONTROL
Report/Patent Number: AIAA PAPER 84-0987
Document Type: Conference Paper
Publication Information: (SEE A84-31684 13-39)
Publisher Information: United States
Contract/Grant/Task Num: NAG2-116
Financial Sponsor: NASA; United States
Organization Source: California Univ.; Los Angeles, CA, United States
Description: 15p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AERODYNAMIC STABILITY; AEROELASTICITY; HEAVY LIFT AIRSHIPS; ROTARY WING AIRCRAFT; STRUCTURAL STABILITY; BENDING; EQUATIONS OF MOTION; EQUILIBRIUM EQUATIONS; HOVERING STABILITY; ROTARY STABILITY; TORSION
Imprint And Other Notes: IN: Structures, Structural Dynamics and Materials Conference, 25th, Palm Springs, CA, May 14-16, 1984, and AIAA Dynamics Specialists Conference, Palm Springs, CA, May 17, 18, 1984, Technical Papers. Part 2 (A84-31684 13-39). New York, American Institute of Aeronautics and Astronautics, 1984, p. 251-265.
Availability Source: Other Sources
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