The Haar condition and multiplicity of zeros

Vel, H. Van de

doi:10.1007/bf01399317

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In formula (1) x x x n     to meet the corresponding conditions,there is only the least squares solution [9],that is…”

Section: Principle Of Least Square Methodsmentioning

confidence: 99%

Study on the relationship between the gray value of the image in the vicinity of the weld pool and the instantaneous voltage in CO2 welding

Liu¹,

Liu²,

Shi³

2017

Proceedings of the 2nd Annual International Conference on Electronics, Electrical Engineering and Information Science (EEEIS 20

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Since the region near the CO 2 welding of short circuiting transfer process of weld pool of light intensity changes, seriously affect the real-time and reliability of weld seam feature extraction, the application and development of CO 2 welding seam tracking technology based on vision has been severely restricted. The change of instantaneous voltage can reflect the arc length changes very well and reflect changes in the strength of the arc. Numerical models were established between the gray value of the image captured by the CCD camera and the instantaneous voltage in the CO 2 welding process, and the systematic study and analysis of the relative change between the two. Experimental results show that: in the short circuit phase, with the decrease of the instantaneous voltage, image average gray value decreases. At the open circuit stage, instantaneous voltage is greater than 12.3854V, with the increase of voltage, increasing average gray value of image; when the instantaneous voltage between 6.7708V to 12.3854V, as the voltage increases, the average gray value of the image is reduced; when the instantaneous voltage is less than 6.7708V, with the increase of voltage, increasing average gray value of image.Keywords: CO 2 welding, Gray value; Instantaneous voltage ForewordWith the rapid development of modern society, people expect more and more high to the performance of the product. Due to the welding process automation and intelligence are to guarantee welding quality, improve production efficiency and an important means to improve working conditions, so the intelligent welding is the important direction of future development.CO 2 gas shielded welding is CO 2 as the shielding gas, the transition of droplet short-circuits transition is the main form, it has a wide application, less energy consumption, high efficiency, strong corrosion resistance and so on [1][2][3][4].For CO 2 arc welding droplet short circuit transition process of molten pool area in the vicinity of the metal spatter, light intensity changes violently seriously affected the weld 596

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“…In formula (1) x x x n     to meet the corresponding conditions,there is only the least squares solution [9],that is…”

Section: Principle Of Least Square Methodsmentioning

confidence: 99%