Submitted To The Faculty Of The Graduate School Of The University Of Minnesota David Rossing Grandall by David Rossing Grandall instant download after payment.

This research consists of predicting the performance and efficiency of hydraulic pumps
and motors, both with experiments and modeling. A pump and motor test stand is constructed
to measure the efficiency of an axial piston swashplate pump/motor unit. A
regenerative loop hydraulic system is used to reduce the power requirements of the test
stand. The test stand uses an xPC Target data acquisition system. Test conditions focused
on low displacement and low speed regimes. Efficiency values ranged from less
than 0% to 82%. An existing efficiency model in the literature is fit to the data. Several
improvements to the model are suggested. The correlation was satisfactory, but room
for improvement still exists. Displacement sensors are recommended in the pump/motor
units being tested. This is to avoid the significant uncertainty associated with calculating
the derived volume based on the data.