In this article, the heavy earth moving machinery like hydraulic excavator used in the construction and mining industries has been taken into consideration. Most of the heavy earth moving machineries used in these industries are mobile with engine as the main source of power. The work deals with two different hydraulic circuits: first the proposed one and second the conventional one, and both are studied at laboratory scale, which resembles the circuit of the hydraulic excavator. In the hydraulic circuit, out of the three hydraulic linear actuators, two are connected with hydro-pneumatic accumulators and one hydro-motor is also taken into consideration, which resembles the boom, arm, bucket and swing motor, respectively. The idea behind the proposed circuit is to store substantial potential energy during downward movement of the two linear actuators in the accumulators, which resembles the boom and arm cylinder of the excavator. The stored energy is used for upward motion of the two actuators without utilizing any energy from the main pump. For the devised strategy, MATLAB/Simulink environment has been utilized for developing the simulation model and the same has been validated with the experimental data with reasonable accuracy. The effect of accumulator volume and pre-charge pressure has been studied for optimization of the accumulator size on the validated simulation model. This concept helps in saving 14.06% energy than its conventional counterpart which does not have the energy storage elements. The linear position control of the boom and the arm actuator in the proposed circuit have been accomplished using proportional–integral–derivative control and pressure-compensated proportional flow control valve and have been achieved with reasonably accuracy.

中文翻译：

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使用多个液气蓄能器的混合动力液压挖掘机的性能提升

在本文中，考虑了建筑和采矿业中使用的液压挖掘机等重型土方机械。这些行业中使用的大多数重型土方机械都是以发动机为主要动力来源的移动机械。这项工作涉及两种不同的液压回路：第一个是建议的液压回路，第二个是传统的液压回路，两者都在实验室规模进行研究，类似于液压挖掘机的回路。在液压回路中，三个液压直线执行器中，两个与液压气动蓄能器相连，并考虑了一个液压马达，分别类似于动臂、斗杆、铲斗和回转马达。所提议的电路背后的想法是在蓄能器中的两个线性致动器向下运动期间储存大量势能，蓄能器类似于挖掘机的动臂和臂油缸。储存的能量用于两个执行器的向上运动，而不使用来自主泵的任何能量。对于所设计的策略，MATLAB/Simulink 环境已被用于开发仿真模型，并已通过实验数据以合理的精度对其进行了验证。已经研究了蓄能器容积和预充压力的影响，以优化经过验证的仿真模型上的蓄能器尺寸。与没有储能元件的传统同类产品相比，这一概念有助于节省 14.06% 的能源。