基于CFD的液压脉动衰减器频率响应分析方法.pdf

CFD CFD 杜 润 刘晓红 于兰英 柯 坚 西南交通大学, 成都, 610031 : 对液压脉动衰减器用CFD 软件进行 数值仿真计算,得到 其频率响应利用M 序列压力 信号模拟压力激励, 并考虑流体的可压缩性,在层流状态下对液压脉动衰减器进行 CFD 数值模拟 在利用FFT 得出其频率特性后,将数值模拟模型与传统精确分析模型进行 对比, 并将该方法用于一 种复杂结构衰减器的频率特性计算结果表明:该计算方法所得结果与传统精确分析模型结果一致,这 对复杂模型的分析具有实际意义 :; ; ;M ; :T H137 : 1004 132X(2010) 11 1315 05 A Method to Frequency Response Analysis of Hydraulic Pulsation Dampers Based on CFD Du Run Liu Xiaohong Yu Lanying e Jian Southwest Jiaotong University,Chengdu, 610031 Abstract: Simulation of transient state of hydraulic pulsation dampers with a CFD code was done to get their frequency response. Under laminar conditions, transient state of pulsation dampers was computed with M- sequence pressure signals acting as a kind of boundary to simulate pressure wave and compressibility of fluid being considered. Frequency response was donevia FFT of transient pres sure sequences. Comparison between CFD model and traditional precise analysis model was presented and this new method was applied to frequency analysis of a complicated structure damper. T he results show: the agreement between CFD numerical analysis and traditional precise analysis is satisfactory, and CFD analysis is practical to analyze frequency response of the complicated structure hydraulicpul sation dampers. Key words: hydraulics; pulsation damper; frequency response; M sequence; CFD( computational fluid dynamics) 0 引言 , M , ,, CFD OpenFOAM , [ 1] FFT , : ,[2] , , , , [3] , 1 衰减器