本文選題：溫度分布　切入點：監(jiān)測　出處：《農(nóng)業(yè)工程學報》2017年21期 　論文類型：期刊論文

【摘要】：針對溫度感知RFID(radio frequency identification)標簽應用于冷鏈物流溫度監(jiān)測中缺乏有效數(shù)據(jù)驗證的問題,該研究通過將42個溫度感知RFID標簽部署于冷鏈模擬平臺中,劃分了7個橫截面、3個縱截面和兩個層,設(shè)置了機械降溫-冷鏈維持-自然回溫3個不同階段,同時在42個監(jiān)測位點中選擇7個位點同步部署了便攜式溫度記錄儀,獲取了不同條件下的溫度監(jiān)測數(shù)據(jù),并與便攜式溫度記錄儀數(shù)據(jù)和CFD(computational fluid dynamics)模擬數(shù)據(jù)進行了比較。7個溫度感知RFID標簽與便攜式溫度記錄儀同步監(jiān)測位點的數(shù)據(jù)表明,兩種監(jiān)測方法溫差分布于±0.5℃范圍內(nèi)的數(shù)據(jù)點最多,占43.6%,溫差分布于-1.0~-0.5℃區(qū)間的數(shù)據(jù)占了24.6%,考慮到2種設(shè)備自身的溫度采集精度,溫差在±0.8℃范圍內(nèi)可接的,其比例占71.3%,因此利用溫度感知RFID標簽進行冷鏈溫度監(jiān)測是可行的。對42個位點在3個不同階段的溫度監(jiān)測數(shù)據(jù)表明,機械降溫階段各位點用時在1 h以內(nèi)、冷鏈維持階段大部分位點表現(xiàn)出溫度在在0~4℃之間振蕩的特征、自然回溫階段用時約49 h。深入分析機械降溫階段及冷鏈維持階段不同截面的溫度監(jiān)測數(shù)據(jù),結(jié)果表明3種截面均表現(xiàn)為降溫初始階段溫度差值不穩(wěn)定、穩(wěn)定后具有明顯的分布特征且離出風口較近降溫較快的特點。以橫截面2和橫截面6平均溫度為例,將溫度感知RFID標簽數(shù)據(jù)采集數(shù)據(jù)與CFD模擬數(shù)據(jù)進行比較,去除測量精度的干擾,截面2的均方根誤差為0.73℃、平均相對誤差為13.58%、截面6的均方根誤差為0.56℃、平均相對誤差為10.94%,具有較好的空間一致性。研究結(jié)果可為實現(xiàn)冷鏈物流中低成本、連續(xù)的溫度監(jiān)測奠定基礎(chǔ)。
[Abstract]:In view of the lack of effective data validation in the application of temperature sensing RFID(radio frequency identification tags in cold chain logistics temperature monitoring, 42 temperature sensing RFID tags are deployed in the cold chain simulation platform. Seven cross sections, three longitudinal sections and two layers were divided into three different stages of mechanical cooling, cold chain maintenance and natural return temperature. At the same time, 7 of 42 monitoring sites were selected to deploy portable temperature recorder synchronously. Temperature monitoring data under different conditions are obtained and compared with portable temperature recorder data and CFD(computational fluid dynamics simulation data. The data of 7 temperature sensing RFID tags and portable temperature recorder synchronous monitoring sites show that, The temperature difference between the two methods is the largest in the range of 鹵0.5 鈩，

本文編號：1586413