Method for channel decoupling of whole-roller flatness meter for cold-rolled strip

A method for channel decoupling of a whole-roller flatness meter for a cold-rolled strip, comprising the following steps executed by artificial calibration and by a computer:

• a, setting a channel number n and a channel breadth b of the flatness meter;
• b, obtaining an influence matrix under the condition of signal interference between the channels, which comprises the following steps:
• b1, making a temporary variable i=1;
• b2, making a temporary variable j=1;
• b3, using a calibration device to apply a calibration force to an i channel of the flatness meter;
• b4, recording an analog/digital (AD) influence value αji of the i channel on a j channel;
• b5, determining whether j=n is true;
• if yes, going to b6;
• if not, making j=j+1 and returning to b4;
• b6, determining whether i=n is true;
• if yes, going to b7;
• if not, making i=i+1 and returning to b3;
• b7, making a temporary variable i=1;
• b8, making a temporary variable j=1;
• b9, calculating an influence coefficient βji=αji /αjj of the i channel on the j channel;
• b10, determining whether j=n is true;
• if yes, going to b11;
• if not, making j=j+1 and returning to b9;
• b11, determining whether i=n is true;
• if yes, going to b12;
• if not, making i=i+1 and returning to b9;
• and
• b12, forming an influence matrix B of coupled channels with all, Bjj , B being a square matrix, wherein j is a row number of the matrix, ranging from 1 to n, and i is a column number of the matrix, ranging from 1 to n;
• c, calculating an inverse matrix (B)−1 of the influence matrix;
• d, using the inverse matrix of the influence matrix to decouple the channels according to a measured signal of the flatness meter;
• and
• e, obtaining flatness distribution after channel decoupling.