双压力航空柱塞泵压力切换动态特性  

Dynamic characteristics of dual-pressure switch for aircraft piston pump

作　　者：欧阳小平[1] 李磊[1] 方旭[1] 杨华勇[1] 

机构地区：[1]浙江大学流体动力与机电系统国家重点实验室,杭州310027

出　　处：《浙江大学学报（工学版）》2016年第3期397-404,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51275450);国家"973"重点基础研究发展规划资助项目(2014CB046403);浙江大学基本科研业务费专项资金资助项目(科研发展专项)(2013FZA4004)

摘　　要：为分析双压力航空柱塞泵压力超调产生的原因从而降低压力超调幅值,建立该泵压力调节机构的动态数学模型,并开展数值仿真研究.分析指出,泵出口等效容腔及斜盘这2个滞后环节是导致泵压力切换时出现压力超调的主要原因.提出降低泵出口等效容腔及在控制柱塞腔前设置阻尼孔等方法来降低压力超调幅值.数值仿真结果表明,当泵出口等效容腔降低为原来的1/3时,泵从高压向低压切换和从低压向高压切换时的压力超调幅值分别下降48.6%和20.4%,设置阻尼孔能有效降低泵从低压向高压切换时的压力超调,但加大了从高压向低压切换时的压力超调幅值,因此应综合运用这些方法来降低压力超调幅值.The dynamic mathematic model of the pressure-controlled mechanism was established and the numerical simulation investigation was conducted to analyze the causes of pressure overshoot in order to reduce the pressure overshoot amplitude.Analysis show that the pump discharge equivalent chamber and the swash plate are the main causes of the pressure overshoot during the dual pressure switch process.Methods for minimizing the pressure overshoot amplitude were proposed,such as lowering the discharge equivalent chamber volume of the pump and configuring an adjustable damp hole.The simulation results indicate that the pressure overshoot amplitudes decrease by 48.6% with dual-pressure piston pump（DPP）switching from high operating pressure to low operating pressure and decrease by 20.4% vice versa at one third of the DPP discharge equivalent chamber volume.While the damp hole can effectively suppress the pressure overshoot amplitude with DPP switching from high operating pressure to low operating pressure,and can increase the pressure overshoot amplitude vice versa.Therefore,these methods should be applied in a comprehensive way.

关 键 词：双压力柱塞泵(DPP) 压力切换 压力超调 

分 类 号：TH137.7[机械工程—机械制造及自动化]