Method for judging resistance encountering of electric lifting table by utilizing wavelet modulus maximum

Abstract

The invention discloses a method for judging resistance encountering of an electric lifting table by utilizing a wavelet modulus maximum value. The method comprises the following steps: (1) acquiringcurrent data of the electric lifting table under different working conditions; the method comprises the steps of (1) obtaining an original signal, (2) performing preprocessing of filtering high frequency and averaging on the original signal to obtain a preprocessed signal, (2) applying CWT to the preprocessed signal in the step (1) to obtain a wavelet coefficient, and (3) positioning a hand clamping moment or a hand clamping region by using gray scale images of the wavelet transform coefficient under different scales. Wherein when an obstacle is encountered, singularity can be generated alongwith the occurrence of the modulus maximum of the wavelet coefficient, so that an obvious stripe cone can be formed in the grayscale image of the wavelet transform coefficient, and (4) searching the wavelet modulus maximum in each scale within the influence range. Drawing a wavelet modulus maximum value line on the scale based on the found wavelet modulus maximum value point, wherein all points inthe line are wavelet transform modulus maximum values. By utilizing the method, the load condition can be effectively identified under each load condition.

Description

technical field [0001] The invention belongs to the field of electric lifting tables, and in particular relates to a method for judging resistance of electric lifting tables. Background technique [0002] With the development of society and economy, people continue to work in the office for longer and longer. According to the survey, office workers spend 1 / 2 to 2 / 3 of their time sitting in a sitting position. The fixed sitting position causes continuous pressure on the spine. cause pain and even deformity. Long-term sitting at a desk will lead to muscle atrophy, weakened mobility, slow blood flow, and easy to suffer from lumbar muscle strain, lumbar disc herniation and other lumbar diseases. Scientific research shows that only sitting and standing alternately is the scientific and healthy way of working. [0003] The electric lift table uses a motor to realize the automatic lifting of the desktop, which can adapt to people's requirements for different desktop heights, and ...

AI Technical Summary

Problems solved by technology

The main reason is that due to cost constraints, the lifting table has no force detection sensor that can measure load changes, but still needs to rely on speed detection and current detection to identify. Due to the lack of effective algorithms, it is difficult to accurately identify the clamping situation

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