What is the Role of Coupling Elements in Flywheel Design using KiSSsoft?

[bhaazee]

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.

 

[bwilson4web]

Perhaps the motor bearings should be included?

I don't see a shaft coupler to handle alignment errors . . . unless the motor rotor is built as integral to the flywheel shaft.

I'm not familiar with the software as much as what bad things happen when these elements are . . . neglected.

GOOD LUCK!

Bob Wilson

 

[bhaazee]

I am not sure if I got u right.

The motor is just indicated as a means of power input into the system. hence no need to indicate the motor bearings. the assumption is that the shaft is coupled perfectly such that no misalignment occurs due to the coupling between the flywheel shaft and motor shaft. The above possible mentioned errors hence are accounted for.

and of course Thnx btw.

 

[KISSsoft]

Hi bhaazee

Add a coupling element to your fly wheel and set it to driving. Take out all the torque there you put in through the coupling of the motor.

Please also note that in KISSsoft the view of driving and driven comes from the gears, and has the gearbox view. So driven means power gets in, and driving means the respective element is a driving element in the machine (typically a pinion). So in your case the coupling at the flywheel is driving the inertia of the flywheel, hence storing energy. And the coupling of the hydraulic pump is driven by the pump/motor.

If you want to see the reverse operation, the flywhell driving and the pump working as a break, switch driving/driven for both couplings.

Hope that helps.