time-variance中文什么意思

下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯

The wastewater treatment system is one dynamic system of indeterminacy , time - variance , nonlinearity and posteriority . so it is difficult to create a precise mathematical model
城鎮(zhèn)污水處理系統(tǒng)是一個(gè)具有不確定性、時(shí)變性、非線性、滯后性的動(dòng)態(tài)系統(tǒng),難于建立起精確的數(shù)學(xué)模型。
The results show that although dbm method can fit the systems with high precision , avoid over - fitting and accurately reflect the time - variance and state - dependency in the systems , it may also reduce the efficiency of the whole method due to the exponentially increasing calculating numbers with the increase of the number of the states . and genetic algorithm is introduced to improve the search efficiency
接著利用dbm方法和其他非線性辨識(shí)算法分別對(duì)時(shí)變參數(shù)方程、 lorenz方程和杜芬方程進(jìn)行分析和比較,發(fā)現(xiàn)盡管方法本身具有擬合精度高,不存在過擬合現(xiàn)象,可以較精確的反應(yīng)參數(shù)對(duì)于狀態(tài)或者時(shí)間的依存關(guān)系等特點(diǎn),但是sdp方法在分析復(fù)雜問題時(shí)存在搜索效率低,計(jì)算時(shí)間長(zhǎng)的缺點(diǎn)。

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