Pet Device Noise Leakage Detection
Case Background
Client: A domestic pet equipment manufacturer

Requirement: During operation, the equipment generates high-frequency noise and air leaks at joints, resulting in a poor user experience. Traditional methods—relying on auditory inspection combined with decibel meters—are unable to quickly pinpoint leak locations, thereby extending the R&D cycle. It is necessary to detect both the leakage points and decibel levels of equipment noise and implement targeted improvements, as well as to monitor whether products on the production line generate excessive noise, so that corrective actions can be taken as early as possible.
Testing Procedure
01.
Preliminary Preparation
·The background noise in the R&D laboratory shall be ≤35 dB(A) when the pet dryer is operated in standard mode.
·The acoustic imaging device is set to a frequency band of 10–40 kHz to suppress ambient air-conditioning noise.
02.
On-site testing
·Hold the acoustic imaging device and scan uniformly along the gaps on the equipment enclosure at a speed of 0.3–0.5 m.
·The screen displays red acoustic spots in real time: the four corners of the door seal, the rear grille, and the fan volute joints are highlighted in sequence.
03.
Re-test results
·Upon disassembly and inspection, a minute notch was found on the O-ring; after replacement and retesting, the red spot disappeared.
·Apply a 5-mm foam pad to the inner side of the door seal, then re-scan the entire unit; the overall sound pressure level decreases by 6 dB.
Extended Applications
01.
Conduct 100% noise inspections at the production line’s end, replacing the previous A-weighted sampling inspections.
02.
Conduct acoustic and visual inspection of incoming fans and pumps from suppliers to prevent hidden abnormal noises from entering the production process.
03.
Post-sales device return with rapid diagnosis to quickly pinpoint the root cause of abnormal noise.
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