PURPOSE: The purpose of this laboratory exercise is to calculate
pressure losses due to
friction in a linear circuit and determine the net force that can
be sustained while
the actuator is moving in the extension direction. Note: Pressure
changes due
to elevation will not be considered in this laboratory exercise.
OBJECTIVE: After completing this laboratory exercise, you should be able to do the following:
1. Determine the pressure at the inlet of the pump;
2. Determine the pressure pressure loss from the pump to the cap
side of the cylinder;
3. Determine the back pressure due to friction on the rod side of
the cylinder;
4. Calculate the force available on the cap side of the cylinder;
5. Calculate the force available on the rod side of the cylinder;
6. Determine the net force available during cylinder extension.
PROCEDURE:
1. Manually calculate and run the Excel pressure lost module to determine
the losses through pipes 1,2,3;
2. Add 1000 psi to this value (pump produces a 1000 psi change);
3. Enter the new calculated value as point 1 for the next iteration
and find the pressure
change for pipes 4,5,6;
4. Determine the pressure change in pipes 10,9 (include DCV in this
section);
Pressure available should be the theoretical pressure on the cap side of
the cylinder;
5. Determine the pressure change through pipes 8,7 (include DCV in
this section);
6. Find the pressure change through pipes 11,12,13;
7. Sum pressure changes through 8,7 AND 11,12,13.
This will be the pressure on
the rod side of the cylinder.
8. Complete a table showing all pressure changes through each respective
piping section;
9. Determine the Net Force on the cylinder (e.g P X Acap - P x Aan).
10.Perform a manual set of calculations for at least three of the piping
sections to verify you
understand how to do the calculations. Compare to the Excel output.
11. Write a formal lab report and submit by next class period.
