Vibration fatigue test radiation noise monitoring device

The invention discloses a vibration fatigue test radiation noise monitoring device, which is characterized in that the noise monitoring device only transmits the vibration radiation noise of a blade in a sound transmission pipeline, so that the blade vibration radiation noise sound pressure measured by a microphone is in linear relation with the blade tip vibration displacement and the blade root vibration strain; when the electric excitation table outputs small excitation force, the linear relation between the blade root vibration strain s and the blade vibration radiation noise sound pressure p monitored by the microphone is calibrated, a coefficient K in the vibration strain-sound pressure relational expression s = K.p is obtained, after the strain gauge loses efficacy, the monitored noise sound pressure p is converted to obtain the blade root vibration strain s, and the blade root vibration strain s is calculated to obtain the blade root vibration strain s. Therefore, the whole-course vibration monitoring