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虛擬節(jié)點(diǎn)有限元法解析滴灌毛管水力特
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Element Method for Hydraulic Design of Drip Irrigation Lateral Lines with Virtual Emitter System
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    摘要:

    滴灌毛管水力學(xué)計(jì)算是滴灌系統(tǒng)設(shè)計(jì)的重要組成部分。利用有限元法和虛擬節(jié)點(diǎn)有限元法對滴灌毛管進(jìn)行了水力學(xué)解析,。結(jié)果表明,，與有限元法相比,，隨著虛擬節(jié)點(diǎn)數(shù)的減少,，虛擬節(jié)點(diǎn)有限元法和虛擬節(jié)點(diǎn)平均水頭損失有限元法計(jì)算結(jié)果誤差增大,，但通過合理選擇虛擬單元個(gè)數(shù),，可達(dá)到與多口系數(shù)法相同的計(jì)算精度,，在滿足實(shí)際滴灌工程設(shè)計(jì)需要的同時(shí)可以顯著減少單元數(shù)量，從而減少計(jì)算量,，其中虛擬節(jié)點(diǎn)法減少95%,，虛擬節(jié)點(diǎn)平均水頭損失法減少

    Abstract:

    98%。The hydraulic performance of lateral lines plays an important role in the drip irrigation system design. The virtual emitters and finite element method were used to compute the head loss and the way to reduce computational errors was suggested by selecting certain amounts of elements in order to meet the need of drip irrigation design. Moreover, virtual emitter with finite element method could dramatically reduce element number needed so as to reduce computational efforts and storage demands by 95 and 98 percent for virtual emitter and virtual emitter average head loss.

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張志新,王建東,徐鎖軍,李淑芹.虛擬節(jié)點(diǎn)有限元法解析滴灌毛管水力特[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(2):68-70. Element Method for Hydraulic Design of Drip Irrigation Lateral Lines with Virtual Emitter System[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(2):68-70.

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