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Investigation of the effects of bandwidth and time delay on helicopter roll-axis handling qualitiesSeveral years of cooperative research conducted under the U.S./German Memorandum of Understanding (MOU) in helicopter aeromechanics have recently resulted in a successful handling qualities study. The focus of this cooperative research has been the effect of time delays in a high bandwidth vehicle on handling qualities. The jointly performed study included the use of U.S. ground-based simulation and German in-flight simulation facilities. The NASA-Ames Vertical Motion Simulator (VMS) was used to develop a high bandwidth slalom tracking task which took into consideration the constraints of the facilities. The VMS was used to define a range of the test parameters and to perform initial handling qualities evaluations. The flight tests were conducted using DLR's variable-stability BO 105 S3 Advanced Technology Testing Helicopter System (ATTHeS). Configurations included a rate command and an attitude command response system with added time delays of up to 160 milliseconds over the baseline and band width values between 1.5 and 4.5 rad/sec. Sixty-six evaluations were performed in about 25 hours of flight time during ten days of testing. The results indicate a need to more tightly constrain the allowable roll axis phase delay for the Level 1 and Level 2 requirements in the U.S. Army's specification for helicopter handling qualities Aeronautical Design Standard (ADS)-33C.
Document ID
19950043496
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Blanken, Chris L.
(NASA Ames Research Center Moffet Field, CA, United States)
Pausder, Heinz-Jurgen
(Institut fuer Flumechanik Braunschweig, Germany)
Date Acquired
August 16, 2013
Publication Date
July 1, 1994
Publication Information
Publication: American Helicopter Society, Journal
Volume: 39
Issue: 3
ISSN: 0002-8711
Subject Category
Aircraft Stability And Control
Accession Number
95A75095
Distribution Limits
Public
Copyright
Other

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