非对称泵控系统势能回收理论研究

Theoretical Study on Potential Energy Recovery of Asymmetric Pump-Controlled System

通过对非对称泵控差动缸系统势能回收效率进行研究,在理论分析的基础上建立势能回收过程的数学模型,分析蓄能器压力对能量回收效率的影响规律;建立势能回收系统的物理仿真模型,对势能回收过程进行仿真研究。结果表明:与普通气囊式蓄能器相比,采用恒压蓄能器进行能量回收可以避免在势能回收过程中,非对称泵从马达工况转化为泵工况而无法回收剩余能量;当负载为10 kN时,采用恒压蓄能器最大节能效率可达到29.8%。通过数值分析计算得到负载下降过程中蓄能器最优压力曲线,可为后续势能回收蓄能器的选型提供理论上的指导。

The potential energy recovery efficiency of asymmetric pump-controlled differential cylinder system was studied. Based on theoretical analysis, a mathematical model of potential energy recovery process was built, and the effect law of accumulator pressure on energy recovery efficiency was analyzed. The physical simulation model of potential energy recovery system was established and the potential energy recovery process was simulated. The results show that: compared with ordinary airbag type accumulators, using constant pressure accumulator can avoid the asymmetric pump from motor condition changing into pump condition then the residual energy in the process of potential energy recovery cannot be recovered;the maximum energy saving efficiency can reach 29.8% when the load is 10 kN.The optimal pressure curve of accumulator in the process of load falling was obtained through numerical analysis, which could provide theoretical guidance for the selection of accumulator for potential energy recovery.