A study conducted to determine whether there is a significant difference in the simulated dynamic response of an F-4C aircraft as it traverses unloaded (undeflected) or loaded (deflected) pavement is described. The U.S. Air Force computer code TAXI, which calculates vertical accelerations at three points on an aircraft as it traverses a pavement profile, was used to simulate aircraft response. An unloaded-pavement profile was obtained on a 640.5-m (2100-ft) test section. Deflections caused by a load cart equipped with an F-4C aircraft tire were measured on the same test section, and these deflections were subtracted from the unloaded-pavement profile to obtain a loaded-pavement profile. A statistical analysis was performed that consisted of two parts: (a) a test of the mean of a sample composed of the differences between acceleration responses to unloaded- and loaded-pavement profiles, and (b) a test of the distribution of the acceleration responses to both types of profiles. The analyses were performed for six aircraft speeds. There was no significant difference in the responses to unloaded- and loaded-pavement profiles at speeds up to 640.5m/s (40.7 ft/s), although at higher speeds some rejections of the mean occurred. Based on the results, it appears that the present U.S. Air Force practice of using unloaded-pavement profiles to simulate the dynamic response of aircraft is acceptable and that loaded-pavement profiles need not be obtained for this purpose. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 72-79
  • Monograph Title: Aviation forecasting, planning, and operations
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00311200
  • Record Type: Publication
  • ISBN: 0309029872
  • Files: TRIS, TRB
  • Created Date: Jun 26 1980 12:00AM