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苹果含水率与介电常数关系模型建构研究

王璨 杜羿翰 刘振宇

王璨,杜羿翰,刘振宇.苹果含水率与介电常数关系模型建构研究[J].农业工程,2023,13(8):18-24. doi: 10.19998/j.cnki.2095-1795.2023.08.004
引用本文: 王璨,杜羿翰,刘振宇.苹果含水率与介电常数关系模型建构研究[J].农业工程,2023,13(8):18-24. doi: 10.19998/j.cnki.2095-1795.2023.08.004
WANG Can,DU Yihan,LIU Zhenyu.Construction of relationship model between moisture content and dielectric constant of apple[J].Agricultural Engineering,2023,13(8):18-24. doi: 10.19998/j.cnki.2095-1795.2023.08.004
Citation: WANG Can,DU Yihan,LIU Zhenyu.Construction of relationship model between moisture content and dielectric constant of apple[J].Agricultural Engineering,2023,13(8):18-24. doi: 10.19998/j.cnki.2095-1795.2023.08.004

苹果含水率与介电常数关系模型建构研究

doi: 10.19998/j.cnki.2095-1795.2023.08.004
基金项目: 山西省应用基础研究计划项目(201901D211364)
详细信息
    作者简介:

    王璨,博士,副教授,主要从事农业信息技术及智能农业装备研究 E-mail:wangcan8206@163.com

    刘振宇,通信作者,博士,教授,主要从事农业物料电磁特性研究 E-mail:lzysyb@126.com

  • 中图分类号: S125

Construction of Relationship Model between Moisture Content and Dielectric Constant of Apple

  • 摘要:

    介电常数与含水率有较高的相关性,可通过测量农产品的介电特性参数预测其干燥过程含水率,高压脉冲电场可有效加快干燥过程,但介电常数和含水率在此过程中的影响机理尚待进一步研究。为解决高压脉冲电场作用下果蔬介电常数与含水率之间关系的微观解释不明确问题,以苹果为研究对象,建立有效的苹果含水率与介电常数关系模型,三维模拟其内部电场参数,使用蒙特卡罗法对高压脉冲电场下苹果的介电特性进行理论模拟计算,把苹果内部宏观和微观介质作为集总参数来等效替代其内部整体结构。试验结果表明,当修正系数8.96时,控制苹果相对水含率从88%逐步下降到18%,介电常数计算值与实测值间相对误差稳定在10%以内。研究为脉冲电场处理果蔬加工提供理论依据。

     

  • 图 1  苹果三维模拟结构

    Figure 1.  3D simulation structure of apple

    图 2  弥散体随机分布模型的单元结构

    Figure 2.  Element structure of random dispersion model of granular materials

    图 3  苹果在xOy平面投影

    Figure 3.  Projection of apple in plane of xOy

    图 4  利用最小二乘三元线性回归确定电位V系数流程

    Figure 4.  Flow chart for determining coefficient of potential V by least squares ternary linear regression

    图 5  利用最小二乘法线性回归模拟电位分布的线性分析

    Figure 5.  Linear analysis of potential distribution by linear regression using least square method

    图 6  利用非线性三元二阶函数确定电位V系数流程

    Figure 6.  Flow chart of determining coefficient of potential V by means of nonlinear three element two order function

    图 7  苹果组织等效电路模型

    Figure 7.  Equivalent circuit model of apple tissue

    图 8  高压脉冲下苹果三维仿真结构图与其电位值的切片图

    Figure 8.  Slice diagram of simulated apple structure and its potential value under high voltage pulse

    图 9  两相不同体积比及相对含水率下苹果介电常数

    Figure 9.  Dielectric constant of apples at different volume fraction and relative moisture content

    表  1  两相不同体积比和相对含水量下苹果介电常数及误差

    Table  1.   Dielectric constant and errors of apples at different volume fraction and relative moisture content

    两相体积比(V1/V2相对含
    水量/%
    介电常数
    实测值
    介电常数
    计算值
    宏观介
    电常数
    相对误差/%
    0.12/0.88886.05.64450.572−6.778
    0.19/0.81814.85.17646.3776.850
    0.30/0.70703.13.42630.7019.123
    0.39/0.61613.23.25529.1661.254
    0.42/0.58583.03.20028.6785.851
    0.59/0.41412.52.77624.8779.555
    0.67/0.33333.02.76024.735−9.157
    0.79/0.21212.22.32120.7994.803
    0.82/0.18182.02.06818.5262.839
    下载: 导出CSV
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  • 收稿日期:  2023-01-04
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  • 出版日期:  2023-08-20

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