Title :
Designing of a static frequency observer for GMAW process in the globular transfer mode
Author :
Khalili, Mohsen ; Haeri, Mohammad ; Tipi, Ali Reza Doodman
Author_Institution :
Electr. Eng. Dept., Sharif Univ. of Technol., Tehran, Iran
Abstract :
In the welding process, droplet detachment regularity is important for a good welding quality. The frequency of detachment is one of influential indices for assessing the quality of GMAW in the globular transfer mode. In this paper, a relationship is estimated for measuring droplet detachment frequency in the globular GMAW. The droplet detachment frequency is estimated with a curve fitting by the least squares error (LSE) method. By using short time frequency transform (STFT) we can extract the frequency contents from the mass of drop that is one of the states in the welding model.
Keywords :
Fourier transforms; arc welding; curve fitting; least squares approximations; observers; GMAW process; curve fitting; droplet detachment frequency; droplet detachment regularity; frequency contents extraction; globular transfer mode; least squares error method; short time frequency transform; static frequency observer; welding process; Feeds; Frequency estimation; Metals; Time frequency analysis; Welding; Wire; GMWW; Globular; Least squares error; Short time frequency transform;
Conference_Titel :
Control Automation and Systems (ICCAS), 2010 International Conference on
Conference_Location :
Gyeonggi-do
Print_ISBN :
978-1-4244-7453-0
Electronic_ISBN :
978-89-93215-02-1
