the actuators at the headbox to remove the perceived perturbation finally a model which contains alignment information is identified from the data comprising the artificial measurement disturbance and the resulting actuator profile in actual implementation of the reverse bump test the u201c bump u201d should not be so drastic as to cause the final product e g paper to be unfit for sale 1 design a bump test by designing the setpoint target bumps u03b4r a using a papermaking machine for illustrative purposes preferably at least two well separated u201c bump u201d are positioned in the cross direction for example they can be located at u00bc and u00be across the sheet width b in the time domain operate the machine at a baseline and then operate the machine in a plurality of steps up and down the simplest technique is to execute a single step that lasts long enough for the closed loop controller to reach its new steady state with the setpoint bumps 2 run the reverse bump test with the cd in closed loop control modify the setpoint target profile with r u03b4r as designed above while logging the data for to illustrate the utility of the inventive technique computer simulations implementing the reverse bump test for closed loop identification were conducted using matlab r12 software from mathworks the simulations modeled a papermaking machine as depicted in fig4 with a headbox having 45 actuators that controlled pulp stock discharge through the corresponding slice lip opening the weight of the finished paper was measured by a scanner at 250 points or bins across the width of the paper from the front to back.