直线驱动电静液作动器的匹配设计规则

Matching design rules of linear-driven electro-hydrostatic actuator

电静液作动器(EHA)是一种高度集成的泵控传动系统,A380和F35等机型已经利用EHA驱动主飞控舵面。但传统的以旋转电机和柱塞泵构成的EHA面临低频响的问题,以一种具有良好动态特性的新原理直线驱动电静液作动器(LEHA)为对象,研究其参数匹配设计问题。LEHA的关键特征在于新型的直线协同配流泵,以及采用直线电机直接驱动泵的吸排油和配流组件。首先,从静态指标匹配性上考虑LEHA的参数设计规则,得到最大空载速度约束条件、最大静态输出力约束条件、系统最高压力约束条件;然后,根据系统模型分析系统各参数对频宽的影响,得到LEHA的动态性能匹配设计规则,具体是指LEHA频宽指标对直线电机振荡频率的约束条件;最后,分析LEHA的功率约束条件,给出了LEHA对惯性负载、弹性负载和黏性阻尼负载在输出力-速度坐标下的功率包络条件,得到LEHA的负载匹配设计约束。LEHA参数设计的6项匹配设计约束条件能够为LEHA的设计过程提供理论依据。

Electro-hydrostatic actuator（EHA） is a highly integrated pump controlled transmission system,and it has been successfully applied to A380 and F35 to drive main flight control surface. However,the traditional EHA composed by rotary motor and axial piston pump has limited dynamic response. This paper introduces a novel linear-driven electro-hydrostatic actuator（LEHA） with fast dynamic response,and studies the parameter design rules of LEHA. The key feature of LEHA is the novel linear pump with collaborative rectification principle. Pistons and valve spools in collaborative rectification pump are directly driven by linear motor. The parameter design rules of LEHA are firstly considered from the static index matching rules,and the constraint conditions of the maximum no-load speed,the constraint condition of the maximum static output force and the constraint condition of the maximum pressure of the system are deduced. According to LEHA＇s mathematic model,the influence of each parameter on the bandwidth of the LEHA is analyzed,and the dynamic performance design rule of LEHA is obtained,which is the constraint condition of the LEHA bandwidth index to the resonance frequency of the linear motor. The power constraint condition of LEHA is analyzed finally,and the power envelope condition of LEHA for inertial load,elastic load and viscous damping load is given in the output force-velocity coordinates,from which the power matching design rule of the LEHA is obtained. In conclusion,the 6 matching design constraints of LEHA parameter design rule can provide a theoretical basis for the design process of LEHA.