寒冷地区电液制动器的油液黏度-时间模型及制动特性研究  

Study on Oil Viscosity-time Model and Braking Characteristics of Electro-hydraulic Brake in Cold Regions

作　　者：王泽河[1] 邢磊 孙亚楠 王磊 魏福生 魏建强 WANG Zehe;XING Lei;SUN Yanan;WANG Lei;WEI Fusheng;WEI Jianqiang(College of Mechatronical&Electrical Engineering,Hebei Agricultural University,Baoding,Hebei 071001;Hebei Province Intelligent Agricultural Equipment Technology Innovation Center,Baoding,Hebei 071001;Hebei Water Conservancy Engineering Bureau Group Limited,Shijiazhuang,Hebei 050021;Hebei Daqing River Affairs Center,Baoding,Hebei 071051)

机构地区：[1]河北农业大学机电工程学院,河北保定071001 [2]河北省智慧农业装备技术创新中心,河北保定071001 [3]河北省水利工程局集团有限公司,河北石家庄050021 [4]河北省大清河河务中心,河北保定071051

出　　处：《液压与气动》2024年第7期111-119,共9页Chinese Hydraulics & Pneumatics

基　　金：河北省水利科技计划项目(2023-35)。

摘　　要：针对寒冷地区电液制动器制动力和制动力矩不足等导致水闸制动系统发生溜车问题,基于液压油Vogel黏温模型以及当地温度变化数据,构建了油液黏度随时间变化的黏度-时间模型,并基于该模型对电液制动器制动过程中油液流动特性进行了研究,然后对电液制动器制动性能进行了定量分析。结果表明:在制动过程中,电液制动器液压油压力主要分布在活塞底腔,且随着黏度增大而逐渐增大,当油液黏度为662.4 Pa·s时,压力达到1.455×10^(-3)MPa,电液制动器液压油在叶轮中心轴部位会出现涡流循环,其循环强度随着油液黏度的增加而逐渐增加;在给定工况下,该电液制动器的最小制动力为1098 N,最小制动力矩为274 N·m。而这一制动力矩已低于该电液制动器工作力矩范围,此时可以通过更换该月份黏度更小的液压油或增设预加热系统等措施来提高其制动力和制动力矩,从而实现正常制动。Aiming at the sliding problem of the brake system caused by insufficient braking force and braking torque of the electro-hydraulic brake in the cold regions,based on the oil Vogel viscosity-temperature model and the local temperature change datas,an oil viscosity-time model was constructed.Based on this model,the electro-hydraulic brake oil flow characteristics in the braking process are studied.Then the braking performance of the electro-hydraulic brake is quantitatively analyzed.The results show that in the braking process,the hydraulic oil pressure of the electro-hydraulic brake is mainly distributed in the piston bottom cavity,and increases gradually with the increase of the viscosity.When the oil viscosity is 662.4 Pa·s,the pressure reaches 1.455×10^(-3) MPa.The eddy circulation of the hydraulic oil appeared in the impeller central shaft,whose intensity gradually increases with the increase of the viscosity.Under the given working conditions,the minimum braking force and braking torque of the electro-hydraulic brake are 1098 N and 274 N·m,respectively.This braking torque is lower than the working torque range of the electro-hydraulic brake.Therefore,the braking force and braking torque can be improved by replacing the hydraulic oil with smaller viscosity in the month or adding a pre-heating system,so as to realize normal braking.

关 键 词：电液制动器 寒冷地区 黏度-时间模型 流场特性 制动特性 

分 类 号：TH137[机械工程—机械制造及自动化] TH237