G - Physics – 05 – B
Patent
G - Physics
05
B
G05B 23/02 (2006.01) B23K 26/42 (2006.01) G06F 17/10 (2006.01) G07C 3/14 (2006.01)
Patent
CA 2497080
A method for controlling the quality of an industrial processes, of the type comprising the steps of: making available one or more reference signals (xref) relating to the industrial process acquiring one or more real signals (xreal), indicative of the quality of said industrial process, comparing said one or more reference signal (xref) to said one or more real signals (xreal) to identify defects in said industrial process. According to the invention the method further comprises the operations of: - obtaining a transformed signal (X ref_inv_norm) from said reference signal (x ref) ; - obtaining a transformed signal (X real_inv-norm) from said real signal (X real) ; - calculating energies (E ref, E real) of said transformed signals, respectively reference (X ref inv norm) and real (X real_inv_norm) said comparing operation comprising: comparing said energies (E ref, E real) of said transformed signals respectively reference (X ref_inv_norm) and real (X real_inv_norm) to extract corresponding time frequency distributions (Tfd ref, Tfd real) for selected frequency values (f_e) ; calculating energies (Et real, Et ref) of said time frequency distributions (Tfd ref, Tfd real) ; comparing the energies of said time frequency distributions (Tfd ref, Tfd real) with threshold values (max_Tfd ref) to identify energy values associated to defects.
D'angelo Giuseppe
Pasquettaz Giorgio
C.r.f. Societa Consortile Per Azioni
Macrae & Co.
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