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Published online by Cambridge University Press: 28 July 2016
A considerable research effort is now directed at the problem of vibrations excited in aircraft structures by airborne sound from the power plants. Both jet and propeller aircraft are involved, although perhaps for different reasons. With jet aircraft the problem is to make the structure strong enough to withstand the vibrations and the accompanying stress fluctuations; with propeller aircraft the problem is usually to prevent the transmission of sound through the structure into the passenger cabin.