Method for early warning chatter detection and asset protection management

摘要

The invention embodies the application of different combinations of the monitoring and data processing aspects as a means to develop an early warning chatter alarming system. Configuring an early warning chatter alarming system can be as simple as using nσ alarm settings to develop an alarming strategy from different trend conditions such as overall RMS, selected vibration frequencies, slope analysis, and wavelet analysis. A higher level of alarming is provided by using a time integrated approach to account for both intensity of the alarm variable and duration. Combining these different aspects with a predictive model incorporates process-operating conditions to enhance the alarming sensitivity for earlier detection and reduce false positives. Finally, combining the different alarming aspects with a rule-based decision making approach such as fuzzy logic allows alarming based on qualitative analysis of different data streams.

主权项

1. A method of detecting and addressing chatter from Yankee dryer doctor blades used in the creping process, cleaning, or cut-off operations, the method comprising the steps of: over a period of time, with a sensor constructed and arranged to measure the frequencies and amplitudes of vibrations in a doctor blade as it crepes a paper product, measuring the frequencies and amplitudes of the vibrations indexed by time; collecting the measurements into a time waveform; converting the waveform using a fast Fourier transform, the converted waveform having a frequency spectrum which includes distinct vibration bands; correlating characteristics of the vibration bands with performance properties of the doctor blade to produce correlated vibration bands; defining (i) acceptable performance properties of the doctor blade and (ii) a baseline of acceptable vibration bands based on the correlated vibration bands and the acceptable performance properties of the doctor blade; predicting from the correlated characteristics the degree of deviation from the baseline of acceptable vibration bands associated with doctor blade chatter; predicting from the correlated characteristics the duration of deviation from the baseline of acceptable vibration bands associated with doctor blade chatter; and outputting when a data point on a correlated vibration band indicates excessive doctor blade chatter has occurred based on the predicted degree and duration of deviation from the acceptable vibration bands; and performing one or more corrective actions to address the excessive doctor blade chatter, the one or more corrective actions being from the group consisting of: installing a new doctor blade, reconditioning a surface, replacing a bearing, and lubricating a bearing.