Internal damage detection method for old mechanical part based on Volterra series

Abstract

The invention discloses an internal damage detection method for an old mechanical part based on the Volterra series. The internal damage detection method comprises the steps of performing pulsed excitation on the old part to be detected through a pulse force hammer under the support of a free boundary; identifying a Volterra non-linear module of a system according to an input detection signal and a corresponding response signal, and giving out a non-linear output frequency response function estimation formula of the system; constructing a sensitive index function through a low-three-order non-linear output frequency response function, and estimating an actually detected value of the sensitive index function according to experiment test data; detecting the sensitivity of the sensitive index function to the internal damage of the old part through a series of tests, and reconstructing the sensitive index function to preferably select a suitable sensitive index function; evaluating an internal defect of the old part according to a non-linear characteristic sensitive index function value obtained through actually detected signal data, and constructing a classification standard for remanufacturing the cold part. The internal damage detection method is suitable for convenient, quick and accurate detection of a batch of old parts.

Description

technical field [0001] The invention relates to a method for detecting internal damage of old mechanical parts in mechanical manufacturing and remanufacturing engineering, in particular to a method for detecting internal damage of old mechanical parts based on Volterra series, which is suitable for convenient, fast and accurate detection of batches of old parts. Background technique [0002] Remanufacturing is a strategic emerging industry. The improvement of remanufacturing technology can ensure that the product quality and performance are not inferior to new products, and even exceed new products, but the cost is only 50% of new products, energy saving is 60%, material saving is 70%, and it is environmentally friendly. adverse effects were significantly reduced. To promote energy saving and emission reduction in the manufacturing industry, remanufacturing projects must be vigorously developed. In remanufacturing engineering, it is the most energy-saving, material-saving a...

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Problems solved by technology

[0011] To sum up, there are no research reports on using the Volterra model to detect damage defects of old parts in remanufacturing, but the existing research and practice have established for us A convenient, fast and accurate method for internal damage detection of old parts based on the Volterra nonlinear model provides a theoretical and practical basis

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