• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (7): 185-193.doi: 10.3901/JME.2021.07.185

• 数字化设计与制造 • 上一篇    下一篇

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变速变排量液压驱动系统的动态过程能效优化

黄海鸿1,2, 唐运先1,2, 金瑞1,2, 李磊1,2, 李大成3, 刘志峰1,2   

  1. 1. 合肥工业大学机械工程学院 合肥 230009;
    2. 机械工业绿色设计与制造重点实验室 合肥 230009;
    3. 安徽源典科技有限公司 合肥 230051
  • 收稿日期:2020-04-05 修回日期:2020-12-04 出版日期:2021-04-05 发布日期:2021-05-25
  • 通讯作者: 黄海鸿(通信作者),男,1980年出生,博士,教授,博士研究生导师。主要研究方向为绿色制造、再制造与回收再资源化等。E-mail:huanghaihong@hfut.edu.cn
  • 作者简介:唐运先,男,1994年出生,硕士研究生。主要研究方向为机电系统绿色设计。E-mail:tangyunxian1234@163.com
  • 基金资助:
    国家自然科学基金资助项目(U20A20295,51722502)。

Energy Efficiency Optimized in the Dynamic Process of a Variable-speed Variable-displacement Pump Unit

HUANG Haihong1,2, TANG Yunxian1,2, JIN Rui1,2, LI Lei1,2, LI Dacheng3, LIU Zhifeng1,2   

  1. 1. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009;
    2. Key Laboratory of Green Design and Manufacturing for Machinery Industry, Hefei 230009;
    3. Anhui Yuandian Technology Co., Ltd., Hefei 230051
  • Received:2020-04-05 Revised:2020-12-04 Online:2021-04-05 Published:2021-05-25

摘要: 液压系统广泛应用于工程机械与液压成形装备等领域,但液压驱动单元输出功率与负载需求功率不匹配造成的低能效问题一直不可忽视。变速变排量驱动单元可协调控制电动机转速和泵排量,实现液压系统在各稳定工况下驱动单元输出功率与负载需求功率的匹配,提高液压系统能量效率。为进一步提高变速变排量驱动单元在复杂多变工况下的能效,对其动态过程中的能效进行深入研究。建立了动态过程能耗优化模型,通过优化模型并结合试验分析得出动态过程最小能耗对应的电动机加速度。通过试验研究了不同加速度下的系统稳定性,分析得出液压缸推杆振动与电动机转速波动有关,可通过调整电动机加速度以限制电动机转速波动从而保证系统稳定性。最后,以液压拉深成形过程为例,在保证系统稳定性的前提下分析拉深成形过程的动态能耗,当电动机采用最佳加速度时,整个动态过程的能效平均提高了8.0%、转速波动量平均降低了14.9%。

关键词: 功率匹配, 动态过程, 能效, 稳定性, 电动机加速度

Abstract: Hydraulic systems are widely used in construction machinery and hydroforming equipment, but the low energy efficiency caused by the power mismatch between output power of the drive unit and demand power of the actuators cannot be ignored. By cooperatively adjusting the motor speed and pump displacement of a variable-speed variable-displacement pump unit, the power match degree can be improved under the stable operating conditions. In order to further improve energy efficiency of the variable-speed variable-displacement pump unit under complex and variable working conditions, energy consumption model of the drive unit during the dynamic process is established. The relationship between energy consumption and motor acceleration is obtained to acquire the optimum motor accelerations and the minimum energy consumption during dynamic process. Moreover, the stability with different motor accelerations of the hydraulic system is investigated by experiments, and the motor accelerations are selected according to the required working conditions for the preferable energy efficiency and stability. The results indicate that energy efficiency and speed fluctuation of the preferable motor acceleration can be improved by 8.0% and 14.9% respectively, compared with that of the default motor acceleration.

Key words: power matching, dynamic process, energy efficiency, stability, motor acceleration

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