| 摘要 |
The tool monitoring system (10) operates generally in two modes: learning mode (40) and monitor mode (84). In learning mode (40), the tool monitoring system gathers statistical data on the power consumption of tools of the selected tool type during learning cycles. A power threshold (78) is generated based upon the statistical data. The tool monitoring system (10) then counts the number of crossings by each of the learning cycles of the power threshold (78) and generates statistical data regarding the number of crossings (56). Preferably, the mathematical operation of wavelet packet transform (60) is used to calculate the power threshold (78). Feature wavelet packets of the power consumption signal (28) of the tool are calculated. The power consumption signal (28) is then reconstructed from the feature wavelet packets (50) and used to determine the power threshold (78). |
