Real-time diagnostics and monitoring system and method for transportation machinery by using sound visualization system and method of band-limited noise

摘要

The present invention relates to a system and method for imaging acoustic characteristics using a hologram of narrowband noise emitted from a moving noise source, and to measuring changes in the noise source by measuring holograms on the side and bottom noise sources of a moving transportation machine. By sensing, the present invention also relates to a system and method for diagnosing and monitoring a transport machine in a non-contact state during operation of the transport machine.;The method for imaging narrowband noise according to the present invention comprises a first step of obtaining a spectrum at the total band ( f_h ) and the center frequency ( f_hc ) of narrowband noise emitted from a noise source at a reference position, and at the measurement position. A second step of measuring a sound pressure ( p_m ) of the noise radiated from the noise source, a third step of obtaining a ratio of the spectrum at the entire frequency band of the narrowband noise to the spectrum at the center frequency, and in the second step And dividing the sound pressure by the spectral ratio obtained in the third step from the sound pressure of the measured noise to obtain a hologram of narrowband noise and imaging it.;In addition, the condition monitoring system of the transport machine according to the present invention, spaced apart from the lower surface and the side surface of the transport machine at any position of the path passing by the transport machine, a certain distance is installed in parallel to each of the transport machine A bottom and side microphone array for measuring sound pressure of narrowband noise emitted from the base; A reference microphone attached to the transport machine for measuring the spectrum at the whole frequency and the spectrum at the center frequency of the narrowband noise emitted from the transport machine; A signal obtained by imaging a ratio of the spectrum in the entire band of the noise and the spectrum at the center frequency and dividing the sound pressure by the ratio of the spectrum from the sound pressure of the noise measured by the bottom and side microphone arrays to obtain a hologram of the noise. Processing means; Storage means for storing a noise map during driving in normal and abnormal states of the transport machine; And retrieving means for monitoring the state of the transportation machine by retrieving the hologram of the noise of the transportation machine from the noise map stored in the storage means.