Hydro Pneumatic Cylinder Working Principle Pdf 34

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Hydro Pneumatic Cylinder Working Principle Pdf 34

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Hydro Pneumatic Cylinder Working Principle Pdf 34

The flow pulsation of the positive displacement pump of the hydraulic system is generally 2 to 5 rps [12]. The flow pulsation is the time derivative of the movement of the pump piston in the cylinder defined as:

where f(t) is the flow rate at time t, which is the position of the piston in the cylinder at time t. The speed and movement distance of the piston at time t is the pump speed and displacement of the piston at time t respectively. That is:

The flow pulsation frequency is the number of times the piston reciprocates in the cylinder in a second and the flow pulsation amplitude is the average pressure difference of the cylinder head and the piston head in the positive displacement pump in each cycle. The flow pulsation frequency of a positive displacement pump also depends on the rotation speed of the pump. In this paper, the flow pulsation is defined as the frequency spectrum of the flow rate at the section of the each cycle of the piston in the cylinder. The rotational speed of the positive displacement pump is 10 to 20 r/s [13].

The piston reciprocates periodically in the cylinder. The piston travels in the cylinder along the axial direction. Therefore, the piston moving displacement, speed, and acceleration vary periodically with time. The piston moving displacement, speed, and acceleration of the piston in the cylinder can be obtained theoretically as:

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