三维离心环境下的电液伺服阀特性分析  

Characteristics of Electro Hydraulic Servo Valves under Three-dimensional Centrifugal Environment

作　　者：訚耀保[1] 李长明[1] 江金林 

机构地区：[1]同济大学机械与能源工程学院,上海200092 [2]上海航天控制技术研究所,上海200233

出　　处：《机械工程学报》2015年第2期169-177,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51475332;51275356);航空科学基金(20120738001;20128038003)资助项目

摘　　要：分析离心环境角速度矢与主阀芯轴向同面垂直、异面垂直及平行等三种典型空间姿态下的电液伺服阀基本特性。根据转动式牵连运动动力学理论,得到衔铁挡板组件、主阀芯的动力学特性以及三维离心环境下的电液伺服阀数学模型,分析离心环境对电液伺服阀衔铁、挡板以及主阀芯三处特征位移的影响。得到电液伺服阀耐加速度性能的布局措施,当主阀芯轴向与离心角速度矢平行布局时伺服阀耐加速度能力最强;当主阀芯轴向与离心角速度矢异面垂直布局时伺服阀耐加速度能力次之;当主阀芯轴向与离心角速度矢同面垂直布局时伺服阀耐加速度能力最差。采用某型电液伺服阀进行验证,根据控制电流为零时的空载流量求得主阀芯偏移量,得到其与离心加速度的数学关系。试验结果和理论结果相吻合。Under uniform and uniformly accelerated circular centrifugal environments, characteristics of the electro hydraulic servo valves（EHSV） with its spool perpendiculars the centrifugal angular velocity vector in a same plane, in different planes and parallels to each other are analyzed. Based on mechanical analysis of the spool and the armature-flapper assembly according to kinetic theory of rotational transport motion, mathematical models of the EHSV under the three-dimensional centrifugal environment are obtained. Influence of centrifugal environment affected on displacements of armature, flapper and spool are got. Capability of acceleration resistance of the EHSV under three typical spatial proposals is gained： the EHSV with its spool parallels the centrifugal angular velocity vector has the strongest resistance to acceleration, the medium one is the EHSV with its spool perpendiculars the centrifugal angular velocity vector in different planes, and the weakest is the EHSV with its spool perpendiculars the centrifugal angular velocity vector in a same planes. Validation test is carried out using a servo valve. Spool displacement is calculated from the no-load flow when the control current is zero. And mathematical relationship between spool displacement and centrifugal acceleration is obtained. The theoretical results are in good agreement with the experimental results.

关 键 词：液压 电液伺服阀 三维离心环境 数学模型 耐加速度 

分 类 号：TH138[机械工程—机械制造及自动化]