DYNAMIC TRACK COMPLIANCE
Analytical expressions for vertical and lateral track compliance are obtained from the solution of a beam on a visco-elastic foundation model. The equivalent foundation parameters were derived from the theory for a mass on a viscoelastic halfspace. The dependence of the overall track stiffness, damping, and natural frequency on the rail, tie, and roadbed parameters are evaluated. Upper and lower bounds for the overall track properties are obtained for existing types of at-grade track structures. A distinct advantage of the approach described is that it results in estimates for the effective damping due to both radiation of energy into the roadbed and energy loss due to internal soil friction. The damping due to internal friction can generally be neglected compared with the radiation damping.
- This abstract is also contained in "A Bibliography on the Design and Performance of Rail Track Structures", September 1974, RRIS #072794, which was prepared for the Urban Mass Transportation Administration.
Transportation Systems Center55 Broadway, Kendall Square
Cambridge, MA United States 02142
- Kurzweil, L
- Publication Date: 1972-5
- Pagination: p. 13-14
- TRT Terms: Damping (Physics); Dynamics; Quality control; Railroad tracks
- Uncontrolled Terms: Lateral dynamics; Vertical dynamics
- Old TRIS Terms: Track quality
- Subject Areas: Railroads;
- Accession Number: 00072825
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 11 1976 12:00AM