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Hydraulic Power Regulation
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
Hydraulic accumulators are widely installed in many hydraulic systems to smooth out pressure pulsations and to store hydraulic potential energy temporarily. It is very common to utilize the stored energy in hydraulic systems as a supplementary power source to provide extra power that will overcome instantaneous extra load, refill leakage, or even serve as emergency power to achieve higher efficiency and a more reliable operation. Because of these features, it is possible for a hydraulic system with an accumulator to use a smaller pump by using the accumulator capability of storing a certain amount of energy during periods of low demand. In addition, accumulators can also reduce the shocks caused by rapid operation or sudden starting and stopping of actuators in a hydraulic circuit.
Regenerative hydraulic SUSPENSION: Numerical model and Evaluation of Energy Harvesting Potential using bond graphs
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Vjekoslav Tvrdic, Srdjan Podrug, Vjekoslav Damic, Milan Perkušić
Hydraulic accumulators are used to store fluid energy during the operation of a hydraulic system. There are different types of accumulators, but the most used are hydraulic with gas (nitrogen) filled accumulators. Hydraulic accumulators consist of two chambers that are usually separated by a piston or diaphragm. The upper chamber of the accumulator is filled with gas and the hydraulic fluid is introduced into the lower chamber through a check valve at the bottom of the structure. If there is no fluid in the accumulator and the gas chamber is empty, the hydraulic check valve in the lower chamber is fully open. To prepare for operation, the hydraulic accumulator is pre-charged to relative pressure and the diaphragm is stretched to fill all available space in the device. In this process, the check valve at the bottom of the accumulator closes. Hydraulic accumulator pre-charge pressure is usually taken at 80% of the minimum fluid operating pressure.