A method for identifying faulty abnormal sound of range hood

Abstract

The invention relates to a method for identifying the abnormal sound of a range hood failure, which is characterized in that: the fan system of the range hood to be tested is set on the workbench of the test room, and a sound collection device is installed next to the fan system of the range hood to be tested. The method for identifying the abnormal sound of the range hood fault includes the following steps: Step 1, collecting and extracting the sound pressure value of the ambient background noise; Step 2, collecting and recording the running sound signal of the fan system of the range hood under test from the start of operation to the operation within 30s , will be divided into three periods; Step 3, extract the sound pressure values ​​of different periods respectively; Step 4, calculate Δ i , if Δ i If it is greater than or equal to the preset value, then according to whether the difference between the sound pressure of the center frequency and the sound pressure of the adjacent center frequency in different periods is greater than or equal to P, it is judged whether there is a faulty abnormal sound in the range hood. Compared with the prior art, the method provided by the invention conducts quantitative analysis and judgment on the sound signal of the range hood, eliminates human influence, has better consistency results, and can also improve work efficiency.

Description

technical field [0001] The invention relates to a method for identifying abnormal sound of a range hood failure. Background technique [0002] With the development of society, the research on the noise of range hoods has gradually become the focus of research on kitchen appliances. The abnormal noise of the range hood fault refers to the abnormal noise that is obviously more unpleasant and unacceptable to people than the normal operation of the range hood. Therefore, it is an urgent need for enterprises to identify range hoods with abnormal noises. [0003] The existing range hood failure and abnormal sound identification method is based on the subjective judgment of the listener listening to the sound of the range hood working process. This identification method is likely to cause hearing loss when the listener listens to boring sounds for a long time. The identification results are completely based on Subjective judgment affects the accuracy of abnormal noise judgment; a...

AI Technical Summary

Problems solved by technology

[0003] The existing range hood failure and abnormal sound identification method is based on the subjective judgment of the listener listening to the sound of the range hood working process. This identification method is likely to cause hearing loss when the listener listens to boring sounds for a long time. The identification results are completely based on Subjective judgment affects the accuracy of abnormal noise judgment; and it is impossible to judge the abnormal noise of the range hood in the startup stage and stable stage, and there is no clear quantitative index, subjective judgment will cause the abnormal noise to be ignored during short-term startup; now There is an identification process that can only be carried out after the complete assembly of the range hood is completed. If a malfunction and abnormal sound is found, it needs to be disassembled and assembled repeatedly, so the work efficiency is very low

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