Force and Pressure Test

1. Select menu 1 (cylinder area and mass effect pressure)

♦ Increase the supply pressure until the load starts to move. Adjust the cylinder load mass and supply pressure until you understand their relationship

♦ Click the yellow arrow buttons to change the cylinder area. Adjust the pressure again to find the point at which the cylinder moves.

2. Select menu 2 (Constant pressure over an orifice) to add an orifice

♦ Change the size of the orifice but note how the pressure drop across it only changes when the cylinder is moving and there is flow through the orifice.

♦ Re-balance the supply pressure to lift the cylinder and record the pressures before and after the orifice.

3. Select menu 3 (Calculating pressure over orifice) to add the formula

♦ Compare your own calculations for flow and pressure drop against the values shown.

♦ Find the cylinder dimensions from a system you know and enter the values into the edit boxes to see how the values compare.

Experiment 1: Adjust the supply pressure and the cylinder load pressure to start the cylinder moving.

Question 1: Does the supply pressure need to be less than, equal to, a little bit more, or much greater than the load pressure for the cylinder to move?

Answer

Experiment 2: Add an orifice and start the cylinder moving again as in Q1

Question 2: What does the supply pressure equal now?

Answer