2.1.9 S9: Duty with nonperiodic load and speed variations
In this mode of operation as shown in Figure 2.11.1 the load and the speed
change nonperiodically within the maximum operating range. Load peaks which
can be far above the rated power may occur frequently. The overload can be
taken into account by selective oversizing.
The duty type cannot be recorded with one simple formula. A suitable continuous
load must be used as the reference dimension for the load cycle: