Design of A New Hydraulic Accumulator for Transient Large Flow Compensation

Abstract

Hydraulic accumulators are widely used in industry due to their ability to store energy and absorb fluid shock. Researchers have designed kinds of novel accumulators with better performance in these specific areas. However, the pressure in these accumulators decreases significantly when the fluid oil is continuously supplied from the accumulator to the hydraulic system. This limitation leads to a transient large pressure drop, especially in a small hydraulic system with varied working frequency. In this research, a combined piston type accumulator is proposed with a relatively steady pressure property. The gas chamber and the fluid chamber are separated by a cam mechanism. By using the nonlinear property of the cam mechanism, the nonlinear relationship between the pressure and the volume of the gas can be offset. Hence, the fluid pressure can be maintained in a relatively steady range. The defect of the traditional accumulator in the frequency varied system is analyzed in detail. Then, the structure of the new accumulator is proposed and modeled based on the traditional piston type accumulator. The mathematical equation of the cam mechanism is built under the assumption that the nitrogen gas works in an adiabatic process. A simulation system based on the Amesim platform is constructed, and mathematic equations of the system are given. Preliminary experiments are conducted to evaluate the performance of the new accumulator. The comparison results show that the adaptability of the new accumulator is obviously larger than that of the traditional accumulator in a frequency varied system.

Review of Hydro-Pneumatic Accumulator Models for the Study of the Energy Efficiency of Hydraulic Systems

“…In [93], a novel hydraulic accumulator is presented that uses a piston with an area that varies with stroke to maintain constant pressure on the hydraulic system while the gas pressure changes. In [94], a combined piston-type accumulator is proposed with a relatively steady pressure property. The gas chamber and the fluid chamber are separated by a cam mechanism.…”

Energy Efficiency of the Vulcanization Process of a Bicycle Tyre

“…• Mechanical library. Some elements of the mechanical library have been used to model the elasticity of the bladder which inflates under the pressure of the steam (as in [41] or in [42]).…”

Application and Research of High-Pressure Energy Storage Technology in Aircraft Hydraulic System

“…Hydraulic energy storage technology has been continuously expanding since it was proposed [5]. In recent years, Ma Haoqin [6] and Zhao Donglai [7,8] et al have made relevant improvements to the constant pressure accumulator, improving its energy storage density. LATAS W [9] and Bao [10,11] have also made some innovations in improving the efficiency of flywheel accumulators.…”