摘要
针对起重机卷扬系统微小流量工况下控制精度不足及负载抖动问题,提出泵阀协同电液混驱系统解决方案。通过构建泵/马达容积效率测试平台,建立压力-流量泄漏补偿曲线,形成双模控制策略:快动工况下阀芯全开,依托泄漏补偿曲线,通过液压泵调控流量;微动工况下依据阀压差实时调节开度,实现精准控制。同步设计电机-马达卷扬机构,有效抑制负载扰动对系统压差的影响。通过AMESim仿真验证,在120、60、20、10 L/min四级流量负载突变时,仅采用泄漏补偿策略马达转速分别下降2.92%、5.17%、17.02%、42.92%;引入电机-马达机构后转速波动基本消除,各流量工况下马达工作压力稳定于4.3~3.8 MPa,泄漏量维持稳定。研究表明,该协同控制体系显著提升了微流量工况控制精度,通过动态压力稳定机制有效抑制了负载扰动引起的系统波动。
To address the insufficient control precision and load oscillation of crane hoisting systems under micro-flow conditions,a solution of coordinated pump-valve electro-hydraulic hybrid-driven system is proposed.A volumetric efficiency test platform for pumps/motors is constructed to establish pressure-flow leakage compensation curves,forming a dual-mode control strategy:the valve spool is fully opened with flow regulated by the hydraulic pump based on leakage compensation curves under the rapid motion mode,and real-time spool opening adjustment is implemented according to valve pressure difference for precision control under the micro-motion mode.A synchronously designed motor-motor hoisting mechanism effectively suppresses the impact of load disturbances on system pressure difference.The AMESim simulations verifies that under abrupt load changes at four flow levels(120,60,20 and 10 L/min),the motor rotational speed is decreased by 2.92%,5.17%,17.02%and 42.92%,respectively,only by using the leakage compensation strategy.With the introduction of the motor-motor mechanism,speed fluctuations are essentially eliminated,with motor operating pressure stabilized within 4.3~3.8 MPa across all flow conditions and leakage maintained at steady levels.The study demonstrates that this coordinated control architecture significantly enhances the control precision under micro-flow condition and effectively suppresses system oscillations induced by load disturbances through dynamic pressure stabilization mechanisms.
作者
杨鹏飞
杨敬
YANG Pengfei;YANG Jing(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024)
出处
《液压与气动》
北大核心
2025年第8期111-122,共12页
Chinese Hydraulics & Pneumatics
基金
山西省自然科学基金(202103021224117)
山西省基础研究项目(20210302123200)。
关键词
液压系统
卷扬机构
泵阀协同
泄漏补偿
电机-马达
hydraulic system
hoisting mechanism
pump-valve coordination
leakage compensation
motor-motor
