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Measurements of Nonlinear Wheelset Forces in Flange Contact Using Dynamically Scaled Models.

PB80190747

Publication Date	1980
Personal Author	Sweet, L. M.; Sivak, J. A.; Putman, W. F.
Page Count	112
Abstract	This report presents new experimental methods for the study of rail vehicle dynamics through the use of scaled models on tangent track, and the application of these techniques to the measurement of nonlinear wheelset force/displacement relations in steady-state. These relations are important to the analysis of wheelset response to track inputs, curving performance of trucks, and wheelclimb derailment. A one-fifth scale model instrumented wheelset with new wheel profiles is used, with similitude scaling of the contact forces achieved through use of a polycarbonate resin for the contact surfaces. Data are presented for wheelset lateral force and yaw moment for the nonlinear range of wheelset lateral displacements and yaw angles, including flange contact. The measured data validate the analytical model presented in a companion report, based on nonlinear wheel/rail contact geometry, creep forces with adhesion limits, and wheelset kinematics. A criterion for wheelclimb derailment is presented and verified experimentally.
Keywords	Railroad trains Undercarriage Railroad tracks Interactions Dynamic response Lateral pressure Rolling contact loads Nonlinear systems Wheel track interactions
Source Agency	Office of the Secretary Department of Transportation Office of University Research Department of Transportation Research and Special Programs Administration
NTIS Subject Category	85I - Railroad Transportation
Corporate Authors	Princeton Univ., NJ. Dept. of Mechanical and Aerospace Engineering.; Department of Transportation, Washington, DC. Office of Univ. Research.
Document Type	Technical Report
Title Note	Final rept. 29 Jun 76-30 Sep 78.
NTIS Issue Number	198019
Contract Number	DOT-OS-60147

Measurements of Nonlinear Wheelset Forces in Flange Contact Using Dynamically Scaled Models.

Measurements of Nonlinear Wheelset Forces in Flange Contact Using Dynamically Scaled Models.
PB80190747

Publication Date	1980
Personal Author	Sweet, L. M.; Sivak, J. A.; Putman, W. F.
Page Count	112
Abstract	This report presents new experimental methods for the study of rail vehicle dynamics through the use of scaled models on tangent track, and the application of these techniques to the measurement of nonlinear wheelset force/displacement relations in steady-state. These relations are important to the analysis of wheelset response to track inputs, curving performance of trucks, and wheelclimb derailment. A one-fifth scale model instrumented wheelset with new wheel profiles is used, with similitude scaling of the contact forces achieved through use of a polycarbonate resin for the contact surfaces. Data are presented for wheelset lateral force and yaw moment for the nonlinear range of wheelset lateral displacements and yaw angles, including flange contact. The measured data validate the analytical model presented in a companion report, based on nonlinear wheel/rail contact geometry, creep forces with adhesion limits, and wheelset kinematics. A criterion for wheelclimb derailment is presented and verified experimentally.
Keywords	Railroad trains Undercarriage Railroad tracks Interactions Dynamic response Lateral pressure Rolling contact loads Nonlinear systems Wheel track interactions
Source Agency	Office of the Secretary Department of Transportation Office of University Research Department of Transportation Research and Special Programs Administration
NTIS Subject Category	85I - Railroad Transportation
Corporate Authors	Princeton Univ., NJ. Dept. of Mechanical and Aerospace Engineering.; Department of Transportation, Washington, DC. Office of Univ. Research.
Document Type	Technical Report
Title Note	Final rept. 29 Jun 76-30 Sep 78.
NTIS Issue Number	198019
Contract Number	DOT-OS-60147