Development of a Myklestad's rotor blade dynamic analysis code for application to JANRAD
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Authors
Ozturk, Dogan
Subjects
Advisors
Wood, E. Roberts
Couch, Mark A.
Date of Issue
2002-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
Blade Dynamics Analysis is a major portion of a helicopter design. The success of the design is strictly related to accuracy of the blade dynamic calculations. The natural frequencies and the mode shapes are not only difficult to calculate but also can be a time consuming procedure. The Myklestad Extension Method gives the designer the opportunity of calculating correct values of the natural frequencies and the mode shapes when centrifugal forces are present. This thesis provides a transfer matrix Myklestad analysis programmed in MATLABʼ and a Graphical User Interface (GUI) tool built in the MATLABʼ programming language version 6.1, to implement the Myklestad Extension Method. The generated code and the GUI are designed to be a part of 'Blade Dynamics Module' of Joint Army/Navy Rotorcraft Analysis Design (JANRAD). For comparison, nonrotating and uniform beam data from Young and Felgar and the actual data of an H-3 (S-61) helicopter blade are used. Results of the comparison show that the accuracy and robustness of the program are very good, which would make this generated code a valuable part of the helicopter designer's toolbox.
Type
Thesis
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Format
xviii, 216 p. : ill. (some col.) ;
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Approved for public release; distribution is unlimited.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Copyright is reserved by the copyright owner.
Copyright is reserved by the copyright owner.