Abstract
In order to predict the interior noise of rolling stocks, an SEA (Statistical Energy Analysis) model of a whole railway carbody has been developed. Since the carbody shell is made of extruded aluminum double skin structures and their CLF (Coupling Loss Factor) cannot be easily estimated from theoretical equations, sectional FEM models of the carbody shell were used to calculate CLFs between each SEA subsystem. The whole carbody shell was modeled as plate subsystems using above mentioned CLFs, and interior panels and the passenger room were also modeled as SEA subsystems. Then, in order to simulate the interior noise of the passenger room with an operational engine under the carbody, input power of the engine was calculated from measured acceleration data. Calculated input power was applied to the SEA model, and the simulated vibration level of the carbody, as well as interior noise of the passenger room agreed well with the experimental results.
