發(fā)布時(shí)間：2018-01-11 18:14

  本文關(guān)鍵詞：泵性能測(cè)試曲線分段最小二乘多項(xiàng)式擬合算法　出處：《排灌機(jī)械工程學(xué)報(bào)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 泵性能測(cè)試 最小二乘擬合 馬鞍形特性曲線 分段曲線擬合算法 插值擬合

【摘要】：針對(duì)現(xiàn)有水泵性能測(cè)試曲線擬合算法單一、對(duì)水泵非穩(wěn)定性狀態(tài)不規(guī)則、馬鞍形等形狀數(shù)據(jù)擬合精度差、近似效果不理想甚至丟失真實(shí)試驗(yàn)數(shù)據(jù)特性的現(xiàn)狀,通過比較水泵性能曲線的各種擬合方法,分析了不同擬合方法在水泵特性曲線擬合中的優(yōu)缺點(diǎn),并針對(duì)特殊的水泵馬鞍形性能曲線,設(shè)計(jì)了分段最小二乘多項(xiàng)式擬合方法.為了保證分段擬合曲線的連續(xù)可導(dǎo)性,在分段最小二乘擬合曲線的基礎(chǔ)上,對(duì)各相鄰分段曲線的分段點(diǎn)采用插值擬合的方法進(jìn)行連接.最后通過試驗(yàn)驗(yàn)證,分別采用分段三階最小二乘擬合算法和五階最小二乘擬合算法對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行擬合,并對(duì)擬合結(jié)果進(jìn)行對(duì)比分析.結(jié)果表明:采用分段最小二乘多項(xiàng)式的擬合方法對(duì)復(fù)雜特性曲線進(jìn)行擬合,可以提高擬合曲線的擬合精度,并保證了擬合曲線的連續(xù)性.
[Abstract]:In view of the existing pump performance test curve fitting algorithm is single, the pump instability state is irregular, the saddle shape data fitting accuracy is poor, the approximate effect is not ideal and even lost the real test data characteristics. By comparing various fitting methods of pump performance curve, the advantages and disadvantages of different fitting methods in water pump characteristic curve fitting are analyzed, and the special pump saddle performance curve is analyzed. The piecewise least square polynomial fitting method is designed. In order to ensure the continuous derivation of the piecewise fitting curve, the piecewise least square fitting curve is based on it. The piecewise points of each adjacent piecewise curve are connected by the method of interpolation fitting. Finally, the test is carried out. The experimental data were fitted by piecewise third-order least square fitting algorithm and five-order least square fitting algorithm respectively. The results show that the fitting accuracy of the fitting curve can be improved by using the piecewise least square polynomial fitting method to fit the complex characteristic curve. The continuity of fitting curve is ensured.
【作者單位】： 江蘇大學(xué)國(guó)家水泵及系統(tǒng)工程技術(shù)研究中心;
【基金】：江蘇省“六大人才高峰”高層次人才項(xiàng)目(2015-JNHB-015)
【分類號(hào)】：TH38
【正文快照】： 湯躍 對(duì)水泵進(jìn)行性能試驗(yàn)時(shí),需要采用曲線擬合的方法對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行擬合,從而得到水泵的性能曲線,但不同的曲線擬合方法得到的性能曲線在曲線的精度及誤差等方面各有差異.在泵性能曲線擬合方法中,插值擬合算法比較簡(jiǎn)單且擬合曲線與試驗(yàn)數(shù)據(jù)比較貼合,但是當(dāng)曲線擺動(dòng)較大,試驗(yàn)，

本文編號(hào)：1410655