Dynamic characteristics of coupling model of valve-controlled cylinder parallel accumulator

Abstract

To solve the electro-hydraulic control problems caused by the accumulator's passive involvement, the internal principle of the valve-controlled luffing cylinder was explored based on one ship crane; comparison models with and without the accumulator were established, and experiments were performed to verify the dynamic characteristics. By comparing simulations with experimental data, it was found that in the outstretch stage of the cylinder, the accumulator releases energy, accelerates the extension of the cylinder, and increases the response velocity. However, the accumulator also reduced the precision of location control. Therefore, to effectively solve the problem of fluctuation rate in the outstretch stage, experiments were conducted to adjust the valve-core opening according to the energy-release characteristics of the accumulator. In the retracting stage of the cylinder, the accumulator absorbed oil and inhibited the pressure fluctuation of the cylinder effectively. Finally, the feasibility of the compensation solution was verified through the experiments.