Metal canned product quality on-line detection method based on sound frequency-spectrum fitting

A technology for product quality and metal cans, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of production process differences such as the influence of the distance change between the microphone probe and the metal can on the test results, so as to avoid production process differences and improve accuracy. The effect of detection rate
CN104597124AActive Publication Date: 2015-05-06INST OF INTELLIGENT MFG GUANGDONG ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF INTELLIGENT MFG GUANGDONG ACAD OF SCI
Publication Date
2015-05-06

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Abstract

The invention discloses a metal canned product quality on-line detection method based on sound frequency-spectrum fitting. The method comprises the following steps: applying excitation to the detected metal canned product to vibrate the product; acquiring the sound generated by the vibrations by using a microphone, sampling the acquired sound signal to obtain a digitized sound signal; processing the sound signal to obtain a sound signal frequency spectrum; carrying out curve fitting on the sound signal frequency spectrum to acquire a curve function and a coefficient set thereof {C}; normalizing {C} to obtain a new coefficient set {C'}; using {C'} as the input parameter of the product quality computation model to acquire the model operation result product quality R; computing the absolute value |D| of the difference between R and qualified product standard value delta; and if |D| is less than the threshold T, determining the detected product is qualified, and contrarily, determining the detected product is unqualified. The method can implement on-line high-speed detection on the metal canned product, effectively avoids the influence of the production technique difference of metal cans and the changes in the distance between the microphone probe and metal can on the detection result, and obviously enhances the detection accuracy.
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Description

technical field

[0001] The invention relates to the field of quality detection of metal canned products, and more specifically relates to an online detection method for the quality of metal canned products based on sound spectrum fitting. Background technique

[0002] Unqualified products will not only cause the same batch of products to be recalled forcibly, bring huge losses to the manufacturer, and affect the reputation of the manufacturer, but also may cause a series of dangerous situations when using unqualified products. Therefore, it is of great significance to study product quality inspection, which can detect defective products before leaving the factory, avoid business losses and ensure consumer safety. Metal cans are generally used as containers to package products, which can play the role of sealing and aesthetics. They are widely used in the food industry. Unqualified metal cans may cause food quality problems. Once unqualified food is eaten by mistake, it is ve...

Claims

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