Application of Improved SDT Algorithm in CNC Machine Monitoring Field

Considering to the problem of requiring and consuming a lot of storage units by collecting the real time data in the CNC machines, an improved Swinging Door Trending (SDT) compression algorithm has been proposed to compress the massive data. Its tolerance can be adjusted dynamically according to the trend of the fluctuations of the data. In addition, Multi-models optimization method was used for function fitting. And points which have great impact on the compression accuracy are saved according to the error of fitting. Less machine status date can be stored without losing valid information, and get a better compression results.