why was the sound of train became different when it was crossing the bridge?
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The vibrations of the train will excite the rigid structure and emphasise the sound, whereas the mass of the ballast and the loose coupling to the subsoil below it will absorb the same vibrations and attenuate them.
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The track on land is laid in “ballast” - a coarse grained gravel-like material of broken stone.
The track on bridges is rigidly fixed to a rigid steel structure.
The vibrations of the train will excite the rigid structure and emphasise the sound, whereas the mass of the ballast and the loose coupling to the subsoil below it will absorb the same vibrations and attenuate them.
it’s no different from you walking on sand , a carpeted floor, or a boardwalk. The sonic properties of the substrate are different, so different sounds are audible
And some girder bridges have tall members very close to the moving train, so turbulence will create additional sounds that cannot be heard elsewhere where there are no nearly structures on the lineside.
The vibrations of the train will excite the rigid structure and emphasise the sound, whereas the mass of the ballast and the loose coupling to the subsoil below it will absorb the same vibrations and attenuate them.
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The track on bridges is rigidly fixed to a rigid steel structure.
The vibrations of the train will excite the rigid structure and emphasise the sound, whereas the mass of the ballast and the loose coupling to the subsoil below it will absorb the same vibrations and attenuate them.
it’s no different from you walking on sand , a carpeted floor, or a boardwalk. The sonic properties of the substrate are different, so different sounds are audible
And some girder bridges have tall members very close to the moving train, so turbulence will create additional sounds that cannot be heard elsewhere where there are no nearly structures on the lineside.
The vibrations of the train will excite the rigid structure and emphasise the sound, whereas the mass of the ballast and the loose coupling to the subsoil below it will absorb the same vibrations and attenuate them.
Mark me as brainliest please
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