Title :
Analysis of ion and X-ray time series measurements of electron beam welding for development of online monitoring
Author :
Choong Sup Yuon ; Bong Jo Hyu
Author_Institution :
Dept. of Control & Technol., Nat. Univ. of Tech., Taejon
Abstract :
Time series analysis results show the singular value decomposition is a candidate of online monitoring of welding penetration in a case that the covariance matrix of a full penetration is used as a mapping function. The mapped time series lie on a hyper-ellipsoid in which the lengths of semi-axes are the squared eigenvalues of the covariance matrix. Furthermore, this algorithm is fast compared with others since only the multiplication with the covariance matrix is used. A depth of welding is closely related with the volume of hyper-ellipsoid
Keywords :
computerised monitoring; covariance matrices; eigenvalues and eigenfunctions; electron beam welding; real-time systems; singular value decomposition; time series; X-ray time series; covariance matrix; eigenvalues; electron beam welding; hyper-ellipsoid; ion collector; ion time series; mapping function; online monitoring; singular value decomposition; welding penetration; Clouds; Covariance matrix; Electron beams; Kinetic energy; Monitoring; Particle beams; Plasma welding; Signal analysis; Time measurement; Time series analysis;
Conference_Titel :
Multisensor Fusion and Integration for Intelligent Systems, 1999. MFI '99. Proceedings. 1999 IEEE/SICE/RSJ International Conference on
Conference_Location :
Taipei
Print_ISBN :
0-7803-5801-5
DOI :
10.1109/MFI.1999.815993
