Dynamisches Verhalten eines Abweiseradsichters beim Anfahrprozess und Materialwechsel

The separation process in a deflector wheel classifier was intensively studied in the past, but not the dynamic behavior. It can take tens of minutes to reach a steady state. A hold-up is formed between the feed of the powder and the discharge via fine and coarse material flow. In this study, the dynamics of a deflector wheel classifier during start-up and material change were investigated. The characteristic times are strongly dependent on the feed loading and less on the rotor speed. For high revolution rates, the characteristic times of both processes are comparable.     

Another objection to the homogeneously weighted moving average control chart

It was recently demonstrated that homogeneously weighted moving average (HWMA) control charts are improper devices for an online detection of changes within a series of random variables. However, another attempt was made to bail out the concept underlying these charts. Here we want to re-emphasize that HWMA charts are dispensable by rebutting the arguments of the latter contribution.