GUIDEWAY ROUGHNESS AS RELATED TO DESIGN TOLERANCES AND PROFILE CONSTRAINTS
The design and construction of a guideway for ground transportation involves compromises between the desired smoothness and the necessary sacrifices in regard to expense and time to achieve it. The degree of natural terrain alteration by means of filling or leveling must be considered during the design of the desired profile in addition to the necessary layout and alignment accuracy of the guideway during actual construction. This report addresses the subject of guideway roughness as related to design and construction tolerances and constraints. The approach is to calculate the power spectral densities (PSD) associated with constrained natural terrain irregularities and construction inaccuracies. Both an analytical approach resulting in equations for PSD and a numerical approach calculating PSD based on the fast Fourier transform are used. Guidelines are established for constraining the profile relative elevation variations during the initial planning and layout of the desired profile. The degree of degradation in smoothness resulting from random surveying, measurement, and alignment errors during the actual construction is determined. /UMTA/
- This project was sponsored by Urban Mass Transportation Center.
University of Texas, ArlingtonPublic Transportation Center, Room 206E
Arlington, TX United States 76010
- Hullender, D A
- Bortley, T M
- Publication Date: 1974-9
- Pagination: 64 p.
- TRT Terms: Alignment; Construction; Design; Equations; Fourier transforms; Guidelines; Guideways; Numerical analysis; Power spectra; Riding qualities; Roughness; Tolerances (Engineering)
- Uncontrolled Terms: Profiles
- Old TRIS Terms: Tolerances
- Subject Areas: Construction; Design; Highways; Pavements; Terminals and Facilities;
- Accession Number: 00125322
- Record Type: Publication
- Source Agency: Urban Mass Transportation Administration
- Report/Paper Numbers: UMTA-TX-11-0001-74-2Final Rpt.
- Files: TRIS, USDOT
- Created Date: Dec 16 1975 12:00AM