新型主动液压滤波器的设计与分析  

Design and analysis of a new kind of hydraulic active filter

作　　者：荆慧强[1] 张晓宁[2] 李艳芬[3] 付永领[4] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191 [2]北京大学信息科学与技术学院,北京100871 [3]北京强度环境研究所,北京100076 [4]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《北京航空航天大学学报》2013年第8期1091-1095,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：科技部国际合作资助项目(2010DFA7254)

摘　　要：针对目前主动液压滤波器体积大、结构复杂等问题,提出了一种占用空间小、结构简单的新型主动液压滤波器.采用计算流体动力学在时域内对滤波器所载流体域进行了压力分布计算,分别对三组可控参数激励位移幅值D m及频率f m作用下的流体域进行分析,通过比较分析发现,D m和f m的选择决定着该液压滤波器性能的优劣,如果二者与原始非定常流幅频特性匹配较好,则该液压滤波器滤波效果良好,反之,会使系统压力脉动变的极不稳定,这与波的干涉原理相互吻合.算例计算结果表明,当激励频率与初始非定常流频率重合达525Hz,且激励幅值达0.05mm时,系统的压力脉动峰峰值可从2.26MPa降到0.25MPa,即脉动从±5.38%降至±0.6%,说明了该主动液压滤波器的有效性.In view of the current hydraulic active filter of large volume, complex structure and other prob- lems, a new type of hydraulic active pressure fluctuation filter （HAPFF） was present with simple structure and small volume. The method of computational fluid dynamics （CFD） was employed to investigate the pressure field distribution in time domain and three group data of Din（excitation amplitude） and f.,（excitation frequen- cy） were involved. The results indicate that the performance of the HAPFF depends on D and f,o, if they match the equivalent parameters of the original unstable flow rate, then the HAPFF perform well, which agree with the wave interference well. The calculation denotes that the peak-peak pressure value reduced to 0.25 MPa from 2.26 MPa when fm= 525 Hz and Dm = 0.05 mm （that is to say, the pressure fluctuation dropped to ＋0.6% from ±5.38% ） , which verify the effectiveness of the proposed design.

关 键 词：压力脉动 主动液压滤波器 波干涉原理 计算流体动力学 

分 类 号：V22[航空宇航科学与技术—飞行器设计]