TY - JOUR
T1 - Sensitivity analysis of railpad parameters on vertical railway track dynamics
AU - Oregui Echeverria-Berreyarza, Maider
AU - Nunez, Alfredo
AU - Dollevoet, Rolf
AU - Li, Zili
PY - 2016
Y1 - 2016
N2 - This paper presents a sensitivity analysis of railpad parameters on vertical railway track dynamics, incorporating the nonlinear behavior of the fastening (i.e., downward forces compress the railpad whereas upward forces are resisted by the clamps). For this purpose, solid railpads, rail-railpad contact and preloaded springs are defined in a three-dimensional (3D) finite-element track model. In addition, railpads are modeled as Prony series so that measured frequency-dependent railpad properties for different clamp toe load, temperature, aging, and railpad type are considered. Through sensitivity analysis using time-domain and frequency-domain responses, the influence of the railpad parameters on the global track response is investigated. Railpad type, toe load and aging are identified as the most relevant parameters in the frequency range of 300-3,000 Hz. Furthermore, the information obtained over track response changes due to fastening loosening and railpad wear could be used for monitoring the condition of fastenings.
AB - This paper presents a sensitivity analysis of railpad parameters on vertical railway track dynamics, incorporating the nonlinear behavior of the fastening (i.e., downward forces compress the railpad whereas upward forces are resisted by the clamps). For this purpose, solid railpads, rail-railpad contact and preloaded springs are defined in a three-dimensional (3D) finite-element track model. In addition, railpads are modeled as Prony series so that measured frequency-dependent railpad properties for different clamp toe load, temperature, aging, and railpad type are considered. Through sensitivity analysis using time-domain and frequency-domain responses, the influence of the railpad parameters on the global track response is investigated. Railpad type, toe load and aging are identified as the most relevant parameters in the frequency range of 300-3,000 Hz. Furthermore, the information obtained over track response changes due to fastening loosening and railpad wear could be used for monitoring the condition of fastenings.
KW - Vertical railway track dynamics
KW - frequency dependent railpad properties
KW - Fastening, sensitivity analysis
KW - finite element model
UR - http://resolver.tudelft.nl/uuid:213a6204-91d4-49c4-a657-216fb3d366d1
U2 - 10.1061/(ASCE)EM.1943-7889.0001207
DO - 10.1061/(ASCE)EM.1943-7889.0001207
M3 - Article
SN - 0733-9399
VL - 143
JO - Journal of Engineering Mechanics
JF - Journal of Engineering Mechanics
IS - 5
ER -