ME309_Fall11_HW11_soln

ME309_Fall11_HW11_soln - Problem 1 Select the sizes...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Problem 1 Select the sizes (displacement) of a pump and a motor for the system shown in figure. Determine the required input torque when the relief valve pressure p 0 is set to 21 MPa and pump rotation speed is np = 2000 rpm. The hydraulic motor should have rotation speed n m = 5 rev/s at load torque T m =100 Nm. Ignore volumetric and hydraulic losses (use ideal relations for hydrostatic pumps and motors). Consider that it is in general convenient to minimize the size of the units. To do that, it is necessary to choose system operating pressure as high as possible (choose a pressure slightly lower than p 0 ).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problem 2 A simplified diagram of a hydraulically driven transfer car is shown in figure. Motors displacement are respectively 150 cm 3 /rev and 200 cm 3 /rev. Radii of wheels are r 1 =0.5 m and r 2 =0.75 m. Assume no losses in the system, and use the ideal relations for the pumps and the two motors, assuming unit efficiencies, and neglecting minor and major losses. Calculate: Pressure p
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

ME309_Fall11_HW11_soln - Problem 1 Select the sizes...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online