Question (3): [1 A three-stage double acung telescopic cylinder is controlled with the circuit represented below. The supply pump has a displacement of 9 cm3/rev and it rotates at a speed of 2000 rpm. The cylinder rods have diameters of 100 mm, 80 mm and 60 mm. The barrel diameters are instead 110 mm, 90 mm and 70 mm. When extending, the cylinder sees a resistive force of 28 kN, while when retracting the external load is null. Calculate the extension and retraction velocities and the pressures in the following case: - No restrictions present in the lines Assume an oil density equal to 850 kg/m3. The relief valve is set to 150 bar. Find: a) Extension speeds Vel (for cylinder 1), Ve2 (Cyl 2), Ve3 (Cyl 3) b) Retraction speeds Vr1, Vr2, Vr3 c) Pump pressure during extension and retraction (PPE, PPR) d A. TT. P PP RV DCV WM FTXM Fig 3 CYL -F

Question (3): [1 A three-stage double acung telescopic cylinder is controlled with the circuit represented below. The supply pump has a displacement of 9 cm3/rev and it rotates at a speed of 2000 rpm. The cylinder rods have diameters of 100 mm, 80 mm and 60 mm. The barrel diameters are instead 110 mm, 90 mm and 70 mm. When extending, the cylinder sees a resistive force of 28 kN, while when retracting the external load is null. Calculate the extension and retraction velocities and the pressures in the following case: - No restrictions present in the lines Assume an oil density equal to 850 kg/m3. The relief valve is set to 150 bar. Find: a) Extension speeds Vel (for cylinder 1), Ve2 (Cyl 2), Ve3 (Cyl 3) b) Retraction speeds Vr1, Vr2, Vr3 c) Pump pressure during extension and retraction (PPE, PPR) d A. TT. P PP RV DCV WM FTXM Fig 3 CYL -F

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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