压力伺服阀前置级间液动力振荡和强迫振动的数值研究  

Numerical study on hydrodynamic oscillation and forced vibration in front stage of pressure servo valve KANG Jian1,YUAN Zhaohui1,WANG Jiangtao2

作　　者：康健 袁朝辉[1] 王江涛 KANG Jian;YUAN Zhaohui;WANG Jiangtaoi(School of Automation,Northwestern Polytechnical University,Xi’an 710072,China;Xi'an Brake Branch,A VIC Aircraft Co.,Ltd.,Xi’an 713100,China)

机构地区：[1]西北工业大学自动化学院,西安710072 [2]中航工业股份有限公司西安制动分公司,西安713100

出　　处：《振动与冲击》2021年第13期120-128,共9页Journal of Vibration and Shock

基　　金：民用飞机科研专项(MJ-2016-S-54)。

摘　　要：电液压力伺服阀是飞机制动控制系统中至关重要的控制元件,输出压力的稳定性将直接影响飞机的稳定着陆。衔铁-偏转板组件受到流体不稳定液动力的作用,容易产生强迫振动和高频噪声。在高周交变液动力的作用下,衔铁组件中弹簧管的刚度将逐渐降低,严重影响伺服阀的动态性能。为了寻找衔铁-偏转板组件强迫振动产生的根源,建立了前置级流固耦合三维模型,根据涡流和气穴形态的演变规律,对不同偏转位移情况下的液动力脉动的幅值和频率进行数值分析。分析在高频周期性外载作用下,衔铁-偏转板组件的结构响应特性。最终得出结论:由涡流和气穴的周期性变化导致衔铁-偏转板组件产生高频率液动力振动,前置级非对称的结构和液动力脉动是衔铁-偏转板组件强迫振动的必要条件。Electro-hydraulic pressure servo valve is an important control element in aircraft braking control system.The stability of its output pressure can directly affect stable landing of aircraft.Its armature-deflector assembly is subject to unsteady hydrodynamic force,it is easy to cause forced vibration and high frequency noise.Under the action of high-cycle alternating hydrodynamic force,the stiffness of spring tube in the assembly can gradually drop to seriously affect dynamic performance of the servo valve.Here,in order to find out the source of forced vibration of the armature-deflector assembly,a 3 D fluid-structure coupled model of the front stage was established.According to the evolution law of vortex and cavitation morphology,amplitude and frequency of hydrodynamic pulsation under different deflection displacements were numerically analyzed.Structural response characteristics of the armature-deflector assembly under high frequency periodic external load were analyzed.Finally,it was concluded that periodic changes of vortex and cavitation cause the armature-deflector assembly to produce high frequency hydrodynamic vibration;the asymmetric structure of front stage and hydrodynamic pulsation are necessary conditions to cause forced vibration of the armature-deflector assembly.

关 键 词：衔铁-偏转板组件 流固耦合 液动力脉动 强迫振动 

分 类 号：O353[理学—流体力学]