  At speeds above 300 km/h, aerodynamic noise becomes a significant source of
railway noise. In a high-speed train, the bogie area is one of the most
important aerodynamic noise sources. To predict aerodynamic noise,
semi-empirical component-based models are attractive as they allow fast and
cheap calculations compared with numerical methods. Such component-based models
have been previously applied successfully to predict the aerodynamic noise from
train pantographs which consist of various cylinders. In this work, the
feasibility is evaluated of applying them to the aerodynamic noise from bogies,
which consist of various bluff bodies. To this end, noise measurements were
carried out in an anechoic wind tunnel for different flow speeds using simple
shapes representing various idealised components of a bogie. These results have
been used to adjust the empirical constants of the component-based prediction
model to enable its application to the bogie case. In addition, the noise from
a 1:10 scale simplified bogie mock-up was measured and used for comparison with
the prediction model. The results show good agreement between measurements and
predictions for the bogie alone. When the bogie is located between two ramps
approximating a simplified bogie cavity the noise is underpredicted at low
frequencies. This is attributed to the noise from the cavity which is not
included in the model.
