Using simDriveline model, no lost ( efficiency 100%) in my driveline model, why the power is reduced

I am developing a simple driveline model using simDriveline. We know if there is no efficiency lost and no gear ratio change on the driveline ( efficiency = 100%, gear ratio = 1), so we can get always the same power at each positions on driveline, because efficient = 100%.

In my model, there are two points A and B, in both positions Rotation and torque are same measured with simscape sensor(reasonable! because over all efficient = 100%, over all gearbox ratio = 1). But if I add a Inertia component on B position ( always with no lost), the torque value in B position will be reduced but rotation keept same. Now the Power ( Power = rotaton * torque) in position B is smaller than Power in position A. I can not understand ,there is no lost ( efficiency = 100%) in my driveline model, why the power is reduced from A to B? where i lost the power?

please help me! thanks a lot.

xiaoming

Answer 1

[Steve Miller]

Without your model, it is hard to be sure what the error is. I suspect you haven't properly sensed and calculated the power in all locations. If you increase the inertia but do not increase the input torque, the output speed will reduce.

--Steve