弓形和矩形先导级2D伺服阀动态特性分析  

Dynamic Characteristics Analysis of Bow and Rectangular Pilot-stage 2D Servo Valve

作　　者：陈烜[1] 阮健[1] 刘奎[1] 朱兆良 赵伟[2] 李胜[1] CHEN Xuan;RUAN Jian;LIU Kui;ZHU Zhaoliang;ZHAO Wei;LI Sheng(R&D Center of Two-dimensional Hydraulic Components and Systems,Zhejiang University of Technology,Hangzhou 310023,China;College of Mechanical and Electrical Engineering,Jiaxing University,Jiaxing 314001,China)

机构地区：[1]浙江工业大学二维(2D)液压/气动元件及系统工程技术研究中心,杭州310023 [2]嘉兴学院机电工程学院,嘉兴314001

出　　处：《农业机械学报》2020年第2期418-426,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51405443);国防科技创新特区项目

摘　　要：2D伺服阀基于螺旋伺服的原理将先导级和功率级集成在阀芯上,具有功率密度高和响应速度快的特点,其动态特性易受先导级节流口的影响。本文对弓形和矩形两种先导级结构的2D伺服阀动态特性及其结构参数对动态特性的影响进行研究。首先,阐述2D伺服阀的结构及工作原理,分别建立弓形和矩形先导级结构2D伺服阀的数学模型;然后,采用数值计算的方法对两种先导级结构2D伺服阀进行仿真分析,获得两者在不同结构参数(斜槽角β、先导级零位开口量h 0)和不同工作压力p s下的阶跃响应特性;最后,搭建2D伺服阀的阶跃特性实验平台,获得弓形和矩形两种先导级结构2D伺服阀的阶跃特性实验曲线,并与仿真结果进行比较。结果表明,在相同结构参数(斜槽角β为82°、先导级零位开口量h0为0.02mm)和20MPa工作压力条件下,2D伺服阀采用矩形先导级结构将阀芯轴向位移对阀芯转角的阶跃响应时间,从弓形先导级结构的3.4ms缩短为1.4ms。将矩形先导级结构应用于以力矩马达作为电-机械转换器驱动阀芯旋转构成的2D电液伺服阀中,当阀芯轴向位移为0.3mm时,其阶跃响应时间为10ms,基本满足2D电液伺服阀对响应速度的要求。2D servo valve combines the pilot-stage and power-stage together based on the spiral servo principle.The throttles of the pilot-stage have a decisive influence on the characteristics of the 2D servo valve.The dynamic characteristics of bow and rectangular pilot-stage 2D servo valves were analyzed,especially under the influence of structural parameters.Firstly,the structure and working principle of the 2D servo valve were introduced,and then the mathematical models of the bow pilot-stage 2D servo valve and the rectangular pilot-stage 2D servo valve were established respectively.Secondly,the step characteristics of the bow and rectangular pilot-stage 2D servo valves under different structural parameters(inclined groove β,pilot stage zero opening h0,system pressure ps)were simulated by numerical method.Finally,a test rig was set up to verify the step characteristics of the bow and rectangular pilot-stage 2D servo valves.As a result,the experimental curves of step characteristics of the bow and rectangular pilot-stage 2D servo valves were obtained.Under the same structural parameters(inclined grooveβwas 82°,pilot zero opening h0 was 0.02mm)and system pressure ps(20 MPa),the step response time of the 2D servo valve was shortened from 3.4 ms(bow pilot-stage 2D servo valve)to 1.4ms by adopting the rectangular pilot-stage structure.Moreover,the rectangular pilot-stage structure was applied to a 2D electro-hydraulic servo valve which a torque motor was employed as electro-mechanical converter to drive the rotary motion of the spool.When the displacement of the spool was 0.3mm,the step response time of whole system was 10 ms,which showed that rectangular pilot-stage electrical-hydraulic 2D servo valves driven by the torque motor can demonstrate a high speed of response.

关 键 词：2D伺服阀 先导级 数值计算 动态特性 

分 类 号：TH137.5[机械工程—机械制造及自动化]