Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : July 10, 2017 - July 12, 2017
When roughness on rail heads or wheel treads is larger, force on both a wheel and a rail becomes greater. There is some possibility of nonlinear vibration transmission from a rail to a concrete structure when the rail is excited by the greater force. To verify the characteristics of nonlinear vibration transmission, excitation tests using by an impulse hammer and an excitation apparatus were carried out in a mock-up viaduct and a test track. The excitation apparatus can excite a rail with larger force. The results of the tests show that the frequency responses on rail vibration are divided into two categories; the force less than 10 kN and that more than 30 kN. The vibration transmission between the rail and the mock-up viaduct and the noise under the viaduct in the force less than 10 kN also differ from those in the force more than 30 kN. The resonance frequency due to the rail mass and the rail pad stiffness in the rail vibration is changed as the excitation force changed. This fact indicates that these phenomena might be due to nonlinearity of the rail pad stiffness.
