Stability Derivatives of a 10° Cone Executing Planar and Nonplanar Motion at Mach 14 PDF Download
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Author: Kevin E. Yelmgren
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 52
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Book Description
A 10 degree half angle circular cone with 1.6% nose bluntness was mounted to the sting-strut support system of ARL's 20-inch Mach 14 wind tunnel by means of a two-degree of freedom flexure. The small amplitude ((approximately equal to symbol)3 deg.) free oscillation technique allowed the investigation of planar motion in pitch, or planar motion in yaw, or nonplanar motion in pitch and yaw combined. In the case of planar motion, the logarithmic amplitude decayed linearly with time. In the case of nonplanar motion, however, the amplitude decay of both the pitch and yaw components was modulated. Such a beating would be expected if the pitch and yaw motions were coupled. The wind-off runs in vacuum did not show this type of beating; only the wind-on runs did. It is, therefore, conjectured that the nonplanar tests indicate the presence of an aerodynamic acceleration coupling term, pitching moment due to yaw acceleration and vice versa, which has a measurable effect on the motion. The observed beat period equals nearly one hundred pitch or yaw oscillation periods.
Author: Kevin E. Yelmgren
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 52
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Book Description
A 10 degree half angle circular cone with 1.6% nose bluntness was mounted to the sting-strut support system of ARL's 20-inch Mach 14 wind tunnel by means of a two-degree of freedom flexure. The small amplitude ((approximately equal to symbol)3 deg.) free oscillation technique allowed the investigation of planar motion in pitch, or planar motion in yaw, or nonplanar motion in pitch and yaw combined. In the case of planar motion, the logarithmic amplitude decayed linearly with time. In the case of nonplanar motion, however, the amplitude decay of both the pitch and yaw components was modulated. Such a beating would be expected if the pitch and yaw motions were coupled. The wind-off runs in vacuum did not show this type of beating; only the wind-on runs did. It is, therefore, conjectured that the nonplanar tests indicate the presence of an aerodynamic acceleration coupling term, pitching moment due to yaw acceleration and vice versa, which has a measurable effect on the motion. The observed beat period equals nearly one hundred pitch or yaw oscillation periods.
Author: O. Walchner
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 20
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Book Description
This final report summarizes the in-house research work on hypersonic stability problems, applicable to reentry dynamics. During the period 1963 to 1974 research contributions were made in the following areas: (1) Static and dynamic stability in pitch; (2) hypersonic roll damping; (3) asymmetric nose effects; (4) non linear aerodynamics; (5) stability coefficients in nonplanar motions. This in-house research effort was terminated as of 1 July 1974.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 970
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 612
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Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 990
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Author:
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ISBN:
Category :
Languages : en
Pages : 1206
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1074
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1208
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Author: Murray Tobak
Publisher:
ISBN:
Category : Nonlinear functional analysis
Languages : en
Pages : 76
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Book Description
The theory of functionals is used to reformulate the notions of aerodynamic indicial functions and superposition. Integral forms for the aerodynamic response to arbitrary motions are derived that are free of dependence on a linearity assumption. Simplifications of the integral forms lead to practicable nonlinear generalizations of the linear superposition and the stability derivative formulations. Applied to arbitrary nonplanar motions, the generalization yields a form for the aerodynamic response that can be compounded of the contributions from a limited number of well-defined characteristic motions, in principle reproducible in the wind tunnel. Further generalizations that would enable the consideration of random fluctuations and multivalued aerodynamic responses are indicated.
Author: Michael B. Smith
Publisher: John Wiley & Sons
ISBN: 0470084944
Category : Science
Languages : en
Pages : 2379
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Book Description
The Sixth Edition of a classic in organic chemistry continues its tradition of excellence Now in its sixth edition, March's Advanced Organic Chemistry remains the gold standard in organic chemistry. Throughout its six editions, students and chemists from around the world have relied on it as an essential resource for planning and executing synthetic reactions. The Sixth Edition brings the text completely current with the most recent organic reactions. In addition, the references have been updated to enable readers to find the latest primary and review literature with ease. New features include: More than 25,000 references to the literature to facilitate further research Revised mechanisms, where required, that explain concepts in clear modern terms Revisions and updates to each chapter to bring them all fully up to date with the latest reactions and discoveries A revised Appendix B to facilitate correlating chapter sections with synthetic transformations
