基于模糊综合判断的液压阀口节流特性优化

Optimization of hydraulic throttling orifice structure based on comprehensive fuzzy judgment

计算U型节流阀口过流截面通流面积A1(X)、A2(X)及其湿周P w1和P w2,并得到了等效水力直径D h1和D h2。推导了表征阀口节流特性的参数:节流压降分配系数均值E(k)及其方差D(k),空化指数σ2的均值E(σ2in)、E(σ2out)及其方差D(σ2in)、D(σ2out)。利用正交试验设计和模糊综合判断得到了节流阀口优化结构,并与初始节流阀口相比较。结果表明:D h2提高了53.85%;E(k)与1的偏差减小了25.23%,D(k)降低了80.50%;D(σ2in)、E(σ2in)、D(σ2out)和E(σ2out)分别减小了35.16%、9.32%、1.61%和62.39%。

By calculating the areas of throttling sections in U-shape orifice and their wetted perimeters, the equivalent hydraulic diameters Dhl, Dta were obtained. Throttling performance parameters, such as mean E （ σ2in ）, E （ σ2out ）, variance D （ σ21n ） , D （ σhout ） , mean E （ k ） and its variance D （k） were derived. Based on orthogonal experimental design and comprehensive fuzzy judgment method, hydraulic throttling orifice structure was obtained and compared with original date. Results showed that Dh increased 53.85% ; the difference between E（k） and 1 decreased 25.23% ,and D（k） decreased 80. 50% ; param- eters D（σ2in） ,E（σzin） ,D（σ2out） and E（σ2out） decreased 35.16% ,9.32% , 1.61% , and 62.39% ,re- soectively.