A computer program was developed to simulate aircraft dynamic response to runway roughness during taxiing and takeoff. The mathematical model has rigid-body degrees of freedom of pitch, roll, and vertical and horizontal translation and up to 30 flexible modes of vibration. Runway profile data measured at approximately 0.61-m (2-ft) intervals is input into the program and used as the model forcing function. A different profile is encountered by each landing gear. All the necessary landing-gear and airplane data were collected for the following aircraft: Boeing--KC-135; B-52C,G,H; T-43 (737); AMST Comp (YC-14); 727-100; 727-200; 707-320; and 747; McDonnell Douglas--AMST Comp (YC-15); C-9A,B;DC-8-63; DC-9-40; DC-10-10; and RF-4C; Lockheed--C-130E; C-5A; C-141; and L-1011; and other--F-111A; A-37; and CT-39. Each of these aircraft was simulated; a comparison of the responses of several different military aircraft showed that the simulated accelerations at the pilot stations were within 5 to 10 percent of the measured values. Typical computer run times were less than 60 s on a CDC 6600. The intended purpose of the program was to locate the rough areas of a runway by using plus or minus 0.4g as a limiting vertical acceleration. Additional useful applications of the program are (a) analysis of pavement dynamic loading; (b) runway repair evalution; (c) evaluation of the dynamic response of new aircraft, such as the Concorde and supersonic transport, on a given runway profile; and (d) the performance of aircraft parametric studies, such as that of the high preload-pressure, nose landing-gear strut, to determine methods for reducing aircraft ground loads. /Author/

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    • This paper appeared in TRB Special Report 175, Research in Airport Pavements. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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    Transportation Research Board

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  • Authors:
    • Gerardi, Anthony G
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  • Publication Date: 1978

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  • Media Type: Print
  • Features: Figures; Tables;
  • Pagination: pp 91-96
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  • Accession Number: 00189940
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: May 11 1979 12:00AM