Method, system and a computer program product for condition monitoring of a fiber web or paper finishing machine

A method for displaying a pattern signifying vibration in a fiber web machine or a paper finishing machine, the method employing at least one machine element mounted for rotation and equipped with a sensor assembly that measures a cross-directional profile of force and/or pressure between the machine element and a counter-pair when engaged in a relation where the machine element is rotated against the counter-pair, comprising the steps of:

• recording with the sensor assembly at least one cross-directional reference profile of force and/or pressure, between the machine element and the counter-pair as the machine element rotates against the counter-pair, wherein the reference profile is obtained while the cross-directional profile is substantially non-varying, or is a computed average of the cross-directional profile over a time period which forms a substantial non-varying value;
• comparing a measurement signal from the sensor assembly that measures a plurality of cross-directional profiles over time to the cross-directional reference profile, wherein the cross-directional profiles over time and the cross-directional reference profile are with respect to the same machine element and counter-pair which are engaged in the same relation;
• and
• continuously displaying with respect to time visually, a time series of the measurement signal compared to the cross-directional reference profile, to show time varying changes arrayed in the cross-machine direction which correlate to vibrational loading experienced by the sensor assembly.

A system for displaying a pattern signifying vibration in a fiber web machine or a paper finishing machine, the system comprising:

• at least one machine element mounted for rotation and engaging a counter-pair, the machine element being equipped with a sensor assembly connected to form an output signal source of a cross-directional profile of force and/or pressure between the machine element and a counter-pair;
• a data memory connected to the output signal source to record a cross-directional reference profile while the cross-directional profile is substantially non-varying, or receiving from a computer an average of the cross-directional profile over a time period which forms a substantial non-varying value;
• a computer connected to the output signal source and having an images feed output which supplies a plurality of time sequenced display outputs of the cross-directional profile of force and/or pressure between the machine element and the counter-pair, from which the cross-directional reference profile, after retrieval from the data memory is subtracted;
• wherein the cross-directional profiles over time and the cross-directional reference profile are with respect to the same machine element and counter-pair which are engaged in the same relation;
• and
• an operator display panel connected to the images feed output to over time display in one direction the cross-directional profiles and in a transverse direction each of the plurality of time sequenced display outputs aligned one after another to show time varying changes in the crossmachine direction which correlate to vibrational loading experienced by the sensor assembly.