Abnormal sound diagnosis system
A storage unit for storing a database of body sensitivity data determined for each position of a sound source, a sound acquisition unit for acquiring sound data in the vehicle cabin as sound data in the vehicle cabin and monitor data as sound data outside the vehicle cabin, a body sensitivity acquisition unit for acquiring body sensitivity data corresponding to the acquired position at which the monitor data is acquired, a sound source estimation unit for calculating sound source estimation data as data of sound estimated to be generated at an abnormal sound source using the body sensitivity data and the vehicle cabin sound data, and a determination unit for determining that there is a generation source of abnormal sound in the vicinity of the acquired position when the monitor data and the sound source estimation data coincide.
1 . An abnormal sound diagnosis system that diagnoses an abnormal sound generated in a vehicle, comprising:
a storage unit that stores a database of body sensitivity data determined for each position of a sound source located outside a vehicle cabin as a ratio of a sound pressure of a sound propagated from the sound source into the vehicle cabin to a sound pressure of a sound generated by the sound source;
a sound acquisition unit that acquires vehicle cabin internal sound data as data on a sound from inside the vehicle cabin and monitor data as data on a sound from outside the vehicle cabin;
a body sensitivity acquisition unit that acquires the body sensitivity data corresponding to an acquisition position at which the monitor data are acquired;
a sound source estimation unit that calculates sound source estimation data as data on a sound estimated as being generated from an abnormal sound generation source using the body sensitivity data and the vehicle cabin internal sound data; and
a determination unit that determines that the abnormal sound generation source is located in a vicinity of the acquisition position when the monitor data and the sound source estimation data coincide with each other,
wherein the storage unit stores a relationship between a frequency and the body sensitivity for each position of the sound source outside of the vehicle cabin.
2 . The abnormal sound diagnosis system according to claim 1 , further comprising a diagnosis unit that diagnoses a cause of the abnormal sound using the acquisition position when the monitor data and the sound source estimation data coincide with each other.
3 . The abnormal sound diagnosis system according to claim 1 , further comprising an informing unit that informs a user of a result of a determination by the determination unit when the monitor data and the sound source estimation data coincide with each other.
4 . The abnormal sound diagnosis system according to claim 1 , further comprising a diagnosis unit that diagnoses a cause of the abnormal sound generation source based on a spectrogram acquired from time-axis data of the sound outside the vehicle cabin without considering the acquisition position determined to have the sound generation source.