I am designing a flywheel for train and for that I am performing a shaft and bearing analysis with KiSSsoft. In KiSSsoft, for analysis of shafts, source of driven and driving have to be given. My flywheel is powered by a hydraulic pump (Hence can use the term "Motor" as "Driving" in KiSSsoft). but the hydraulic pump acts as ahydraulic motor as well to recuperate the stored energy in flywheel later when needed. But I know know what has to be denoted as "driven", since the same h.pump is used as h.motor for recuperation. When the flywheel is decoupled from the hydraulic pump, the flywheel starts to loss energy due to air friction and loses all its energy (comes to halt) after say 60 minutes. This means I can use the term "powerloss" (as "driven" in KiSSsoft). But this happens only when I no longer use the flywheel's energy (say at the end of the day). Hence the term "powerloss"can't be considered. Can someone help me out in this? Regards.