The maximum working pressures of the HP-accumulator and LP-accumulator are and p l1, respectively rrespondingly, the minimum working pressure of the two accumulators are p h2 and p l2 cause the minimu p h1 m demand pressures in extension and retraction stages of the piston are different, the switching points between …
In this study, a novel double-stage hydraulic system incorporating a hydraulic controllable accumulator (HCA) was proposed to simultaneously improve the energy and working efficiency of the ...
To address this problem, a new energy-saving system based on hydraulic accumulator is proposed in this paper. A simulation model of the system is established. The simulation shows that the system can recover up to 73% of the gravitational energy while reducing the installed power of the electric motor by 60%, specifically from …
Sun, W & Virvalo, T 2005, Simulation study on a hydraulic-accumulator-balancing energy-saving system in hydraulic boom. in Proceedings of the 50th National Conference on Fluid Power, March 16-18, 2005, Las Vegas, Nevada USA. pp. 371-381.
Modeling and simulation of hydrostatic transmission system with energy regeneration using hydraulic accumulator May 2010 Journal of Mechanical Science and Technology 24(5):1163-1175
hydraulic c ylinders and hydraulic accumulator w as proposed to recovery the potential energy of the 116 bucket, the stick and the boom, which gained comprehensive energy-saving rate is 41.6 % ...
In operation, the hydraulic pump raises system pressure and forces fluid to enter the accumulator. (Valves control oil flow in and out.) The piston or bladder moves and compresses the gas volume because fluid pressure exceeds the precharge pressure. This is the source of stored energy. Movement stops when system and gas pressures are …
Ahn et al. proposed a novel hydraulic hybrid forklift for energy saving stored in the accumulator. The results showed that the maximum energy-saving efficiency could reach 56% in one cycle and the ...
(9) 4.4 Accumulator The hydraulic accumulator is a device which stored the hydraulic energy in form of pressure. The hydraulic accumulator here is modeled based on its physical attributes. In the current paper, the Van der Waals'' equation is employed to model the hydraulic accumulator.
Second, mechanical energy, hydraulic energy, and electric energy are coupled and transformed in the electromechanical-hydraulic coupler, and the braking energy can be recovered and stored in the ...
In this study we investigate development of energy saving system for hydraulic excavator. In the system an accumulator storages power when energy exceeds and assists …
Li et al. [15] proposed a novel layout for a 21 t excavator which exploits hydraulic accumulators to recover boom potential energy, kinetic swing motor energy …
At present, a variable displacement-type hydraulic pump units (VD pump unit) and inverter control-type pump units (INV pump unit) are widely used. In this paper, the authors propose using an ...
Sun W, Virvalo T. Accumulator-pump-motor as energy saving system in hydraulic boom. In Koskinen KT, Vilenius M, editors, The Eight Scandinavian International Conference on Fluid Power, Proceedings of the Conference, May 7-9, 2003, Tampere, Finland, SICFP´03.
The low-pressure side of the hydraulic motor can pull fluid from the tank through check valves 7 and 8. The flow direction is shown by a red line in Fig. 1 when the right side of the hydraulic motor is the output side. During the acceleration, DC 1 and DC 2 work in the left or right position based on the rotational direction of the hydraulic motor.
This paper will develop a novel electro-hydraulic actuator with energy saving characteristics. This system is able to work in differential configurations through the shifting algorithm of the valves, meaning that …
Hydraulic accumulators have long been used in hydraulic circuits. Applications vary from keeping the pressure within a circuit branch to saving load energy. …
Hydraulic accumulators have long been used in hydraulic circuits. Applications. vary from keeping the pressure within a circuit branch to saving load energy. Among these applications, storing and ...
The energy saving system was tested on a 21.5-ton hydraulic excavator, and the results showed that the energy consumption of the boom lifting …
Different strategies for improving the energy efficiency of a power hydraulic system have been reviewed in this article. The energy-saving scheme is …
Solar energy, as one of the promising energy sources, is abundant, clean and inexhaustible. In addition, the energy conversion device, photovoltaic (PV) panels, possesses the advantages such as no production of pollutants, long lifespan and low maintenance. 7 Although the price of the PV panels is still high, the developments of …
[12] SUN W ei, VIRV ALO T. Accumulator-pump-motor as energy saving in hydraulic boom[C] // 8th Scandinavian International Conference on Fluid Power, T ampere, Finland, May 7–9, 2003: 297–309 ...
As shown in Fig. 1, the osmotic engine consists of the following components: (a) a large cylinder with a diameter of 240 mm, which contains the hydrogel, (b) a weight which increases the downward motion during the shrinking process, (c) a lever which connects the hydrogel cylinder to (d) an oil hydraulic cylinder. ...
They studied the energy consumption of valve-controlled hydraulic systems and valve-controlled hydraulic energy-saving systems based on hydraulic …
Pedchenko and Barth [3] proposed a strain energy accumulator which stored energy through the strain energy of the stretched elastomer material. Van de Ven [6][7] [8] also invented a novel constant ...
SUN Wei, VIRVALO T. Simulation study on a hydraulic-accumulator-balancing energy-saving system in hydraulic Boom[C]//50th National Conference on Fluid Power, Las Vegas, American, March, 13–15, 2005: 371–381. BRUUN L. …
The range includes standard bladder accumulators as well as those designed for oil & gas, ASME and high pressure. HYDAC bladder accumulators consist of either welded or forged pressure vessels, the accumulator bladder itself and the fittings for the gas-side and medium-side connection. They come in a standard design but special designs for ...
Research on energy saving system of hydraulic excavator based on three-chamber accumulator. November 2023. Journal of Energy Storage 72 (2):108571. DOI: 10.1016/j.est.2023.108571. Authors:
Equation 7 has a practical implication. If a gas-loaded accumulator is used to drive an actuator, both flow and force change in time. The only possible way of keeping a constant pressure, p, for ...
To address this problem, a new energy-saving system based on hydraulic accumulator is proposed in this paper. A simulation model of the system is established. The simulation shows that the system can recover up to 73% of the gravitational energy while reducing the installed power of the electric motor by 60%, specifically from 5.5 kW in the baseline …
Supply emergency fail-safe power to complete a work safety cycle in the event of a pump or electric power failure. Hold necessary high pressure for long periods of time while preventing oil overheating, reducing pump wear, and saving energy. Dispense lubricants in a slow, constant rate to critical equipment wear areas.
A new hydraulic closed-loop hydrostatic transmission (HST) energy-saving system is proposed in this paper. The system improves the efficiency of the primary power source. Furthermore, the system is energy regenerative, highly efficient even under partial load conditions. It can work in either a flow or pressure coupling configuration, …
Zhao et al. [3] applied VF hydraulic pump to a central air conditioning system achieving good energy saving by means of optimization. Energy-saving problems with a VF hydraulic control have also ...
A hydraulic accumulator is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source. This external source can be a spring, a raised weight, or a compressed gas. The main function of a hydraulic accumulator is to store potential energy by compressing a gas or lifting a weight and …
The paper is focused on the experimental results regarding the operation of a new energy recovery system. The system is used to electrohydraulic driven a lifting system. The energy recovery method is based on the use of a hydraulic power multiplier cylinder and an accumulator. Three working scenarios are presented and the performance of the system …