Standardized Acceleration Processing for Pavement Roughness Evaluation

Aircraft body vertical accelerations are frequently used to characterize the response of an aircraft to pavement disturbances during ground maneuvers. A standardized procedure is presented which can be used to process measured and simulated aircraft accelerations. In the procedure, an acceleration of interest is filtered according to the weighting functions defined in ISO Report 2631-1, “Mechanical Vibration and Shock – Evaluation of Human Exposure to Whole-Body Vibration, Part 1: General Requirements.” Ride quality index values are computed from the weighted time histories according to four methods defined in the ISO report: 1) root mean square (r.m.s.); 2) running r.m.s.; 3) fourth power vibration dose; and 4) spinal response acceleration dose. These functions were previously implemented by the Federal Aviation Administration (FAA) in a standalone computer program called “ISO Accel Processing” written in the Microsoft VB6 language. They have now been implemented in a Microsoft Windows Presentation Foundation (WPF) development of the FAA computer program ProFAA. The new program is called ProView and the time history weighting and ISO index computations are applied to the acceleration outputs of the internal aircraft simulations. An additional function has been added to the program whereby an externally generated acceleration time history from any source can be read from a text file. The weighting and ISO index functions are then performed on the externally generated acceleration time history and the results displayed in the same way as the accelerations from the internal aircraft simulations. The implementation of the ISO functions is described in detail together with two examples: 1) the weighted time history and ISO index values computed from the internal aircraft simulation in response to an elevation profile measured on an airport runway and 2) the weighted time history and ISO index values computed from an external acceleration record measured on an aircraft operating on the same airport runway as in the first example.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 17p
  • Monograph Title: 2014 FAA Worldwide Airport Technology Transfer Conference Proceedings: Innovations in Airport Safety and Pavement Technology

Subject/Index Terms

Filing Info

  • Accession Number: 01538310
  • Record Type: Publication
  • Report/Paper Numbers: P10048
  • Files: TRIS, ATRI, USDOT
  • Created Date: Sep 9 2014 7:01AM