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連續(xù)流糧食干燥控制系統(tǒng)變量分析與結(jié)構(gòu)設(shè)
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Analysis and Structural Design on Automatic Control System of Continuous Flow Grain Drying
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    摘要:

    針對糧食干燥影響因素多且不確定,以及測量結(jié)果存在滯后的問題,提出了連續(xù)流糧食干燥被控變量和控制變量的選擇方法,通過實(shí)驗(yàn)數(shù)據(jù)對影響糧食干燥過程的各因素及各因素對糧食出口含水率的靈敏度進(jìn)行了分析。結(jié)果表明,影響較大的因素有排糧電動機(jī)轉(zhuǎn)速、熱風(fēng)溫度、糧食初始含水率,影響較小的因素有環(huán)境溫度、熱風(fēng)和冷卻風(fēng)風(fēng)量、糧食初始溫度。設(shè)計(jì)了連續(xù)流糧食干燥過程自動控制系統(tǒng)的控制結(jié)構(gòu),引入微分環(huán)節(jié)可有效抑制因測量而造成的滯后現(xiàn)象。

    Abstract:

    Aiming at solving the problem in grain drying, with many uncertain influence factors, that the measurement results hysteresis exists, the selection approach was presented on both the controlled and control variables of the continuous flow grain drying. Based on experimental data, factors affecting grain drying process and multiple factors sensitivity affecting grain outlet moisture content were analyzed. The result shows the major factors influencing the grain outlet moisture content sensitivity are discharge motor rotation speed, heated air temperature and initial moisture content; ambient temperature and initial temperature etc. also have effects on grain outlet moisture content sensitivity to a small extent. A control structure of the automatic control system for continuous flow grain drying was designed, and a restraint approach for the measurement lag was introducing differential block.

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王士軍,毛志懷.連續(xù)流糧食干燥控制系統(tǒng)變量分析與結(jié)構(gòu)設(shè)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(5):115-118. Analysis and Structural Design on Automatic Control System of Continuous Flow Grain Drying[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(5):115-118.

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