Acoustic testing method and apparatus

Abstract

To make it possible to easily remove an operation sound such as an industrial robot and the like existing around an inspection object as a noise component.SOLUTION: An audible sound generation device sounding a prescribed non-audible sound upon operation is preliminarily provided in instruments such as an industrial robot and the like which can be a noise source. A non-functional and operation-soundless sound inspection method is configured to: collect a horn sound of a vehicle on an inspection line by a microphone, and acquire the collected sound as sound data at a sampling frequency of 96 kHz (S1); separate the acquired sound into an audible sound and a non-audible sound on a high-frequency side (S2); perform respective frequency analyses (S3); identify the instrument on duty on the basis of a frequency characteristic of the non-audible sound (S4); eliminate noise of audible frequency data with an operation sound corresponding to the instrument as a noise component (S5 and S6); determine whether the acquired horn sound is a normal sound or an abnormal sound on the basis of the post noise-eliminated audible sound frequency data (S7); and display a determination result on a display (S8 and S97).SELECTED DRAWING: Figure 2

Claims

1. Regarding multiple devices in the vicinity of the object being inspected that produce operating noises, data on inaudible sounds emitted when the device is operating and data on operating noises are stored in advance for the purpose of identifying the device. The system acquires sounds emitted from the subject being tested. The acquired sound is separated into audible and inaudible sounds. The frequency characteristics of the above audible sound and the above inaudible sound were analyzed, Based on the frequency characteristics of the above-mentioned inaudible sound, the corresponding equipment is identified. The operating noise generated by this device is removed as a noise component from the frequency characteristics of the audible sound described above. The acoustic test of the object under inspection is performed based on the frequency characteristics after noise component removal. Acoustic testing methods.

2. Multiple devices are each equipped with an inaudible sound generating device that emits a different predetermined inaudible sound when the device is in operation. The acoustic inspection method according to claim 1.

3. The above-mentioned device has multiple operating types, each with a different operating sound, and the inaudible sound generating device emits a different inaudible sound for each operating type. The acoustic inspection method according to claim 2.

4. The operating sounds of the above devices are acquired in advance and stored in a memory linked to each device. The acoustic inspection method according to claim 1.

5. The audible sound component included in the operating sound of the above-mentioned equipment is subtracted from the frequency characteristics of the above-mentioned audible sound as the noise component. The acoustic inspection method according to claim 1.

6. The inaudible sounds emitted by inaudible sound generating devices are inaudible sounds with higher frequencies than audible sounds. Inaudible sound generating devices that are relatively far from the microphone that acquires sound emitted from the object being tested emit inaudible sounds at relatively low frequencies. The acoustic inspection method according to claim 2.

7. The inaudible sounds emitted by inaudible sound generating devices are inaudible sounds with higher frequencies than audible sounds. The inaudible sound generating device emits a modulated wave with a fluctuating frequency lower than that of audible sound. The acoustic inspection method according to claim 2.

8. The rise time characteristics of the sound pressure of the above-mentioned inaudible sound generating device are rectangular, triangular, or sinusoidal. The acoustic inspection method according to claim 2.

9. The equipment and its operating type are classified using one or more of the following: inaudible sound frequency, fluctuation frequency, sound pressure, sound pressure rise characteristics, or a combination of two or more of these. The acoustic inspection method according to claim 2.

10. The acoustic inspection method according to claim 1, wherein the inspection results are displayed on a display means.

11. The test will target one of several devices, each equipped with an inaudible sound generating device. The acoustic inspection method according to claim 2.

12. As part of the above acoustic inspection, the frequency characteristics after noise component removal are compared with those of the normal sound being inspected to determine whether the acquired sound is normal or abnormal. The acoustic inspection method according to claim 1.

13. Regarding multiple devices in the vicinity of the object being inspected that generate operating noises, a storage unit pre-stores data on inaudible sounds emitted when the devices are operating and data on operating noises for the purpose of identifying the devices. A sound acquisition unit that acquires sounds emitted from the object being inspected, An audible / inaudible sound separation unit that separates the acquired sound into audible and inaudible sounds, A frequency response analysis unit analyzes the frequency characteristics of the above-mentioned audible sound and the above-mentioned inaudible sound, respectively. An operating device identification unit identifies equipment equipped with a corresponding inaudible sound generating device based on the frequency characteristics of the above-mentioned inaudible sound, This device includes a noise reduction unit that removes the operating noise it produces as a noise component from the frequency characteristics of the audible sound, An inspection unit that performs acoustic testing of the object under inspection based on the frequency characteristics after noise component removal, An acoustic inspection device comprising the following:

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