Estimation of vibration attenuation coefficient of wheel sets on electric locomotive underframe
The work objective is to describe the theoretical and experimental research of the vibration attenuation coefficient of the wage wheels on the electric locomotive underframe. Studying the vibro-acoustic characteristics at the workplaces of the locomotive crews shows that the excess of the octave sound-pressure levels over the maximum permissible values is largely determined by the noise structural component which is generated by vibrations of the body parts. The vibration velocity calculation is based on the energy methods traditionally used for the energy-closed circuits. The system of equations takes into account not only the geometric parameters of the elements, their physical and mechanical properties, but also the vibration power from the locomotive wheel pairs introduced into the base body under the speed conditions. For the engineering analysis of the vibration spectra of the body parts, and, respectively, of the sound-pressure levels when evaluating the introduced vibration power, it is expedient to use a frequency dependent value of the vibration reduction factor. This is especially important at the machine designing stage. Therefore, the results of the experimental study of the given value and the development of the regressional dependences for various motion speeds on this basis are presented.