基于非匀强电场的谷物水分在线检测方法研究
摘要
谷物干燥机械是实现谷物生产机械化的重要机具之一。谷物干燥机械化已经成为我国谷物生产全程机械化的瓶颈。目前,虽然已经有一些塔式干燥机械应用,但我国广大的农村却依然采用自然干燥法干燥谷物。究其原因还是其脱离中国国情。为了加速社会主义新农村建设,实现农业机械化,专家们提出了适合我国农村的平仓式谷物干燥机的设想,并开展广泛研究。但是,由于平仓式谷物干燥机工作原理和结构上的原因,无法采用传统的电容式谷物水分在线检测方法来在线测定谷物水分。所以,研究开发一种适用于平仓式谷物干燥机的新型的谷物水分在线检测方法已经成为一项摆在我们面前刻不容缓的任务。
本文从匀强电场中谷物的电特性研究入手,深入地研究了谷物的带电方式和特点。结合谷物本身介于电介质与生命体之间这一特点,提出了谷物的带电方式有极化带电、摩擦带电和生命带电三种,并且通过试验探讨了他们的成因和机理。极化带电是由载流子的定向运动和偶极子的取向共同造成的。其贡献多寡与谷物的生命特征有关。当谷物水分较低时,谷物的生命特征较弱,可以作为电介质处理。这时偶极子的取向是极化带电的主要贡献者。而当谷物水分较高时,谷物的生命特征较强,应该作为生命体处理。这时浓差极化增强,载流子的定向运动成为极化带电的主要贡献者。摩擦带电是一种广泛存在的带电形式。它存在于谷物的相对运动中。虽然尚无摩擦带电的权威性成因解释,但是,通过试验,还是能够发现其中的规律。谷物的摩擦带电的电性与其和摩擦材料的介电常数有关。当谷物的介电常数大于摩擦材料的介电常数时,谷物带负电;而当谷物的介电常数小于摩擦材料的介电常数时,谷物则带正电。谷物摩擦电量的多少与两者介电常数的差有关。两摩擦材料介电常数的差越大,摩擦电量也就越多。生命带电是生命活动的表现形式之一。它是由于谷物生命活动中维持细胞膜内外物质交换的膜电势差所造成的,所以,生命带电与谷物的水分具有十分密切的相关关系。从安全水分开始,随着谷物水分的增加,生命带电量增大。
在电特性应用方面,本文重点介绍了谷物清选分级和水分检测。谷物清选分级研究很多,但应用基本没有。对于谷物清选分级机研制,没有确定一个能够反映谷物分离程度的能够指导设计的参数。通过试验研究,本文提出以极化力和谷物质量组成的参数一极化力质比可以作为谷物清选分级机设计中的量化指标。试验结果表明,优劣谷物之间存在着极化力和极化力质比上的显著差异。本文测定了一些谷物的极化力质比。对于谷物水分检测,静态检测基本成熟,已经有了商品机型销售;而在线检测虽然已经应用在一些大型干燥机上,如塔式干燥机,但是,由于研究状态的不同以及修正措施上的滞后,导致了示值误差高达1.5%左右。更重要的是传统的基于电特性的谷物水分测量都是采用平行平板电容器的结构,这限制了它在许多干燥机上的应用,例如平仓式谷物干燥机。通过农业物料的电特性应用介绍,我们试图寻求一种新的谷物水分在线检测方法。
本文从满足平仓式谷物干燥机结构需要出发,提出了基于非匀强电场的谷物水分在线检测方法。进行了非匀强电场中谷物电特性理论研究和大量的试验研究。同时设计并试验了共面水平电极谷物水分传感器及其测量系统。基于非匀强电场的谷物水分在线检测方法的理论核心是由双电轴组成的非匀强电场中谷物的电特性。参照匀强电场中谷物电特性,并根据平仓式谷物干燥机的工作特点,确定了测定频率、谷物水分、电极间距以及谷物层厚度等4个影响因素。为了方便研究,设计了由共面水平电极谷物水分传感器及其测量系统组成的专用测定装置。利用电介质物理学和生物物理学知识对非匀强电场中谷物电特性进行了理论研究。双电轴形成电场的等电位曲线为两族圆心互为反演的偏心圆族线。谷物表面极化电荷密度极值点出现在以电轴轴心为圆心的与谷物表面相切的圆的切点处。测定频率对谷物电特性影响与匀强电场中的具有显著的差异,其间不是对数关系,而是反比关系。作者利用声子和势能垒理论以及高分子结构学说,从微观结构上解释了其关系的成因,并且对试验结果进行了宏观拟合,拟合结果是相关性高度显著。当测定频率较高时,水稻品种间的电特性差异较小。谷物水分与电特性的关系也不是对数关系,而是3次多项式的关系。该结果是由极化、水分和非匀强电场三因素共同作用的动态平衡的结果。误差分析结果表明,其误差均小于1%。电极间距对谷物电特性的影响与谷物水分等因素有关。原则上是极间距越小,精度越高。但结合平仓式谷物干燥机的工作特点和试验结果,极间距应当适中。谷物层厚度对电特性的影响主要表现为接触压力和容重。共面水平电极因其电极在同一水平面而不存在接触压力差,容重的影响也是在高水分情况下才有。所以,谷物层厚度对电特性的影响在谷物层厚度小于50cm时可以忽略不计。根据平仓式谷物干燥机的工作特点,基于非匀强电场的谷物水分在线检测方法在测定频率为9000Hz,极间距为16mm条件下,谷物电特性与水分的关系最显著,效果也最佳。
本文设计了由共面水平电极谷物水分传感器、高频电源、标准电阻和数据处理系统组成的基于非匀强电场的谷物水分在线检测装置。通过比较、选择,确定了最佳目标函数。以电极间谷物的电压降作为目标函数,它与水分的关系也是3次多项式。拟合误差在谷物水分小于23%时,低于2.6%。在安全水分处,误差在0.5%左右。能够满足平仓式谷物干燥机的工作要求。作者还对共面水平电极谷物水分传感器及其测量系统进行了干燥中谷物水分在线检测试验,并分析了试验误差。试验中采用了20912和徐稻3号两个水稻品种以及周麦15小麦品种。通过试验发现,谷物达到安全水分时,水稻的水分目标函数值无种间差异,但与小麦的水分目标函数值存在着不同。这有利于平仓式谷物干燥机水分在线检测的简化操作。
The grain-drying machine is one of important implements in the process accomplishing the mechanization of grain production. The mechanization of grain drying has become the bottleneck of the mechanization of whole grain production process in China. Although some tower drying machines have been used at present, but natural drying method has been applied to dry grain in our vast countryside. The thing accounting for the occurrence is that the machines do not tally with our actual situation. In order to accelerate the construction of a new socialist countryside and accomplish the mechanization of agriculture, experts proposed the idea of pin drying machine which tallies with our actual situation and carried out a lot of researches. But the traditional capacitor method of on-line determination of the water content of grain is not applied to that in pin drying machine because of its operating principle and structure. Therefore, the research of a new method of on-line determination of grain water content suitable for pin drying machine has become a task which brooks no delay confronting us.
The charging patterns and their characteristics are studied deeply beginning with the research of the electric properties of grain under uniform electric field in this paper. It is put forward that the charging patterns of grain have polarization charging, friction charging and vital charging in light of that the characteristics of grain are between dielectric and organism. The polarization charging is caused by the directional movement of carrier and orientational polarization of dipole jointly. Their contributions are related with the vital characteristics of grain. When the water content of grain is lower, the vital characteristics of grain is weak, it is considered as dielectric. The orientational polarization of dipole is major contributions in the polarization charging. And when the water content of grain is higher, the vital characteristics of grain is strong, it is considered as organism. The concentration polarization increases at this moment. The directional movement of carrier is major contributions in the polarization charging. Friction charging is a charging pattern which exists widely. It exists in relative movement of grain. Although there is not an authoritative explanation of the formation cause of friction charging, but we can find its law by experiments. The charge character of friction charging of grain is related with the dielectric constants of grain and frictional material. When dielectric constant of grain is greater than that of frictional material, grain charges are negative. Whereas dielectric constant of grain is less than that of frictional material, grain charges are positive. The charge quantity of friction charging of grain is related with the quantitative difference between the dielectric constants of grain and frictional material. The larger the difference is, the more the charge quantity is. The vital charging is one of manifestations of biological behavior. It is caused by the potential difference of membrane, which maintains matter exchange between the inner and the outer of cell membrane. Therefore, vital charging has close relation to the water content of grain. Beginning from safe water content of grain, the charge quantity of vital charging increases with the increase of the water content of grain.
On the use of the electric properties of grain, the cleaning-grading and water determining of grain are introduced mainly. There are many studies of the cleaning-grading of grain, but its use is not seen basically. There is not a parameter, which reflects separate level and is used to guide the design on the development of the cleaning-grading machine of grain. By using of experiment, the parameter that consists of polarization force and grain mass, the ratio of polarization force to mass is proposed in this paper. The ratio of polarization force to mass should be the quantitative parameter on the design of cleaning-grading machine of grain. The experimental results show that there are the remarkable differences of the polarization force and the ratio of polarization force to mass between good grain and bad one. Determining the ratio of polarization force to mass of some grains is carried out in the paper. The quiescent determining technology matures basically and there are commodity machines on sale on the determining of the water content of grain. Although the on-line determining has been used in some large drying machine, for example tower drying machine, but the error is as high as 1.5% because of the difference of research condition and the lag of corrected measure. It is important that all traditional determining devices of water content based on the electric properties of grain use the structure of parallel flat capacitor. This limits to its use on many drying machines, for example pin grain drying machine. We try to find a new on-line determining method of the water content of grain with the introduction of the uses of the electric properties of grain.
In this paper, proceeding from the requirement of the structure of pin grain drying machine, the method of on-line determination of grain water content is proposed based on non-uniform electric field; the theoretical researches and a lot of experiments are carried out on the electric properties of grain under non-uniform electric field; and the sensor of the water content of grain which has the level electrodes at the same plane and its measure system are designed and tested at the same time. The theoretical core of the determining method of the water content of grain based on non-uniform electric field is the electric properties of grain under non-uniform electric field that is produced by double electric axes. Consulting the electric properties of grain under uniform electric field and according to the operating characteristics of pin grain drying machine, 4 influence factors are determined, they are determining frequency, grain water content, electrode gap and grain layer thickness. For convenient research, the special determining device is designed that consists of the sensor of the water content of grain that has the level electrodes at the same plane and its measure system. Author conducted the theoretical researches on the electric properties of grain under non-uniform electric field by the knowledge of dielectric physics and biophysics. The equipotential lines of the electric field caused by double electric axes are 2 eccentric circle family lines that are mutual inversion. The extremum points of the polarization charge density of grain surface appear in the points of tangency that are the circle that the center of circle is at the center of electric axis and grain surface. The influence of determining frequency on electric properties of grain under non-uniform electric field is obviously different from that under uniform electric field. The relationship is not logarithmic function, whereas is inverse function. Author explains the formation cause of the relationship from microstructure by using the theory of phonon and potential barrier and the doctrine of high polymer. And the fitting on the experimental results is carried out. The coherence of fitting results is of high significance. When the determining frequency is higher, the difference of the electric properties of rice is less. The influence of the water content of grain on electric properties of grain under non-uniform electric field is not logarithmic function, whereas is 3 order multinomial. This result is that of dynamic equilibrium that polarization, water content and non-uniform electric field affect together. The results of error analysis show that the error is less than 1%. The influence of the electrode gap on the electric properties of grain is related with the factor of the water content of grain. Theoretically the thinner the electrode gap is, the higher the precision is. But according to operating characteristic and the experimental results, the electrode gap should be moderate. The influence of the grain layer thickness on the electric properties of grain mainly is contact pressure and bulk weight. There is not the difference of the contact pressure in the level electrodes because the electrodes are at the same plane. The influence of the bulk weight only appears in high water content. Therefore, when the grain layer thickness is less than 50cm, its influence on the electric properties of grain is neglectful. According to operating characteristic of pin grain drying machine, the method of on-line determination of grain water content based on non-uniform electric field has the most significant relationship between the electric properties and the water content of grain and best effect at the determining frequency of 9000Hz and the electrode gap of 16mm.
In this paper, the device of on-line determination of grain water content based on non-uniform electric field is designed, which consists of the sensor of the water content of grain which has the level electrodes at the same plane, the high frequency power supply, the standard resistance and the data processing system. By means of comparing and choosing, the best objective function is defined, that is potential difference of grain between the electrodes. The relationship between potential difference and water content of grain is 3 order multinomial. The fitting errors are less than 2.6% when the water content of grain is less than 23% and about 0.5% when the water content of grain is the safe water content. This is satisfied with the operating requirement of pin grain drying machine. Author still carries out the experiments of on-line determination of the water content of grain by the sensor of the water content of grain that has the level electrodes at the same plane and its measure system, and conducts the analysis of experimental errors. The grain breeds of 20912, Xudao 3 and Zhoumai 15 are applied in the experiments. By experiments, it is found that there is not a breed difference in the objective function of rice water content at the safe water content of grain, but the objective function of rice water content is different from that of wheat water content. This is good for the simplification of operating determining the water content of grain online in pin drying machine.
本文从匀强电场中谷物的电特性研究入手,深入地研究了谷物的带电方式和特点。结合谷物本身介于电介质与生命体之间这一特点,提出了谷物的带电方式有极化带电、摩擦带电和生命带电三种,并且通过试验探讨了他们的成因和机理。极化带电是由载流子的定向运动和偶极子的取向共同造成的。其贡献多寡与谷物的生命特征有关。当谷物水分较低时,谷物的生命特征较弱,可以作为电介质处理。这时偶极子的取向是极化带电的主要贡献者。而当谷物水分较高时,谷物的生命特征较强,应该作为生命体处理。这时浓差极化增强,载流子的定向运动成为极化带电的主要贡献者。摩擦带电是一种广泛存在的带电形式。它存在于谷物的相对运动中。虽然尚无摩擦带电的权威性成因解释,但是,通过试验,还是能够发现其中的规律。谷物的摩擦带电的电性与其和摩擦材料的介电常数有关。当谷物的介电常数大于摩擦材料的介电常数时,谷物带负电;而当谷物的介电常数小于摩擦材料的介电常数时,谷物则带正电。谷物摩擦电量的多少与两者介电常数的差有关。两摩擦材料介电常数的差越大,摩擦电量也就越多。生命带电是生命活动的表现形式之一。它是由于谷物生命活动中维持细胞膜内外物质交换的膜电势差所造成的,所以,生命带电与谷物的水分具有十分密切的相关关系。从安全水分开始,随着谷物水分的增加,生命带电量增大。
在电特性应用方面,本文重点介绍了谷物清选分级和水分检测。谷物清选分级研究很多,但应用基本没有。对于谷物清选分级机研制,没有确定一个能够反映谷物分离程度的能够指导设计的参数。通过试验研究,本文提出以极化力和谷物质量组成的参数一极化力质比可以作为谷物清选分级机设计中的量化指标。试验结果表明,优劣谷物之间存在着极化力和极化力质比上的显著差异。本文测定了一些谷物的极化力质比。对于谷物水分检测,静态检测基本成熟,已经有了商品机型销售;而在线检测虽然已经应用在一些大型干燥机上,如塔式干燥机,但是,由于研究状态的不同以及修正措施上的滞后,导致了示值误差高达1.5%左右。更重要的是传统的基于电特性的谷物水分测量都是采用平行平板电容器的结构,这限制了它在许多干燥机上的应用,例如平仓式谷物干燥机。通过农业物料的电特性应用介绍,我们试图寻求一种新的谷物水分在线检测方法。
本文从满足平仓式谷物干燥机结构需要出发,提出了基于非匀强电场的谷物水分在线检测方法。进行了非匀强电场中谷物电特性理论研究和大量的试验研究。同时设计并试验了共面水平电极谷物水分传感器及其测量系统。基于非匀强电场的谷物水分在线检测方法的理论核心是由双电轴组成的非匀强电场中谷物的电特性。参照匀强电场中谷物电特性,并根据平仓式谷物干燥机的工作特点,确定了测定频率、谷物水分、电极间距以及谷物层厚度等4个影响因素。为了方便研究,设计了由共面水平电极谷物水分传感器及其测量系统组成的专用测定装置。利用电介质物理学和生物物理学知识对非匀强电场中谷物电特性进行了理论研究。双电轴形成电场的等电位曲线为两族圆心互为反演的偏心圆族线。谷物表面极化电荷密度极值点出现在以电轴轴心为圆心的与谷物表面相切的圆的切点处。测定频率对谷物电特性影响与匀强电场中的具有显著的差异,其间不是对数关系,而是反比关系。作者利用声子和势能垒理论以及高分子结构学说,从微观结构上解释了其关系的成因,并且对试验结果进行了宏观拟合,拟合结果是相关性高度显著。当测定频率较高时,水稻品种间的电特性差异较小。谷物水分与电特性的关系也不是对数关系,而是3次多项式的关系。该结果是由极化、水分和非匀强电场三因素共同作用的动态平衡的结果。误差分析结果表明,其误差均小于1%。电极间距对谷物电特性的影响与谷物水分等因素有关。原则上是极间距越小,精度越高。但结合平仓式谷物干燥机的工作特点和试验结果,极间距应当适中。谷物层厚度对电特性的影响主要表现为接触压力和容重。共面水平电极因其电极在同一水平面而不存在接触压力差,容重的影响也是在高水分情况下才有。所以,谷物层厚度对电特性的影响在谷物层厚度小于50cm时可以忽略不计。根据平仓式谷物干燥机的工作特点,基于非匀强电场的谷物水分在线检测方法在测定频率为9000Hz,极间距为16mm条件下,谷物电特性与水分的关系最显著,效果也最佳。
本文设计了由共面水平电极谷物水分传感器、高频电源、标准电阻和数据处理系统组成的基于非匀强电场的谷物水分在线检测装置。通过比较、选择,确定了最佳目标函数。以电极间谷物的电压降作为目标函数,它与水分的关系也是3次多项式。拟合误差在谷物水分小于23%时,低于2.6%。在安全水分处,误差在0.5%左右。能够满足平仓式谷物干燥机的工作要求。作者还对共面水平电极谷物水分传感器及其测量系统进行了干燥中谷物水分在线检测试验,并分析了试验误差。试验中采用了20912和徐稻3号两个水稻品种以及周麦15小麦品种。通过试验发现,谷物达到安全水分时,水稻的水分目标函数值无种间差异,但与小麦的水分目标函数值存在着不同。这有利于平仓式谷物干燥机水分在线检测的简化操作。
The grain-drying machine is one of important implements in the process accomplishing the mechanization of grain production. The mechanization of grain drying has become the bottleneck of the mechanization of whole grain production process in China. Although some tower drying machines have been used at present, but natural drying method has been applied to dry grain in our vast countryside. The thing accounting for the occurrence is that the machines do not tally with our actual situation. In order to accelerate the construction of a new socialist countryside and accomplish the mechanization of agriculture, experts proposed the idea of pin drying machine which tallies with our actual situation and carried out a lot of researches. But the traditional capacitor method of on-line determination of the water content of grain is not applied to that in pin drying machine because of its operating principle and structure. Therefore, the research of a new method of on-line determination of grain water content suitable for pin drying machine has become a task which brooks no delay confronting us.
The charging patterns and their characteristics are studied deeply beginning with the research of the electric properties of grain under uniform electric field in this paper. It is put forward that the charging patterns of grain have polarization charging, friction charging and vital charging in light of that the characteristics of grain are between dielectric and organism. The polarization charging is caused by the directional movement of carrier and orientational polarization of dipole jointly. Their contributions are related with the vital characteristics of grain. When the water content of grain is lower, the vital characteristics of grain is weak, it is considered as dielectric. The orientational polarization of dipole is major contributions in the polarization charging. And when the water content of grain is higher, the vital characteristics of grain is strong, it is considered as organism. The concentration polarization increases at this moment. The directional movement of carrier is major contributions in the polarization charging. Friction charging is a charging pattern which exists widely. It exists in relative movement of grain. Although there is not an authoritative explanation of the formation cause of friction charging, but we can find its law by experiments. The charge character of friction charging of grain is related with the dielectric constants of grain and frictional material. When dielectric constant of grain is greater than that of frictional material, grain charges are negative. Whereas dielectric constant of grain is less than that of frictional material, grain charges are positive. The charge quantity of friction charging of grain is related with the quantitative difference between the dielectric constants of grain and frictional material. The larger the difference is, the more the charge quantity is. The vital charging is one of manifestations of biological behavior. It is caused by the potential difference of membrane, which maintains matter exchange between the inner and the outer of cell membrane. Therefore, vital charging has close relation to the water content of grain. Beginning from safe water content of grain, the charge quantity of vital charging increases with the increase of the water content of grain.
On the use of the electric properties of grain, the cleaning-grading and water determining of grain are introduced mainly. There are many studies of the cleaning-grading of grain, but its use is not seen basically. There is not a parameter, which reflects separate level and is used to guide the design on the development of the cleaning-grading machine of grain. By using of experiment, the parameter that consists of polarization force and grain mass, the ratio of polarization force to mass is proposed in this paper. The ratio of polarization force to mass should be the quantitative parameter on the design of cleaning-grading machine of grain. The experimental results show that there are the remarkable differences of the polarization force and the ratio of polarization force to mass between good grain and bad one. Determining the ratio of polarization force to mass of some grains is carried out in the paper. The quiescent determining technology matures basically and there are commodity machines on sale on the determining of the water content of grain. Although the on-line determining has been used in some large drying machine, for example tower drying machine, but the error is as high as 1.5% because of the difference of research condition and the lag of corrected measure. It is important that all traditional determining devices of water content based on the electric properties of grain use the structure of parallel flat capacitor. This limits to its use on many drying machines, for example pin grain drying machine. We try to find a new on-line determining method of the water content of grain with the introduction of the uses of the electric properties of grain.
In this paper, proceeding from the requirement of the structure of pin grain drying machine, the method of on-line determination of grain water content is proposed based on non-uniform electric field; the theoretical researches and a lot of experiments are carried out on the electric properties of grain under non-uniform electric field; and the sensor of the water content of grain which has the level electrodes at the same plane and its measure system are designed and tested at the same time. The theoretical core of the determining method of the water content of grain based on non-uniform electric field is the electric properties of grain under non-uniform electric field that is produced by double electric axes. Consulting the electric properties of grain under uniform electric field and according to the operating characteristics of pin grain drying machine, 4 influence factors are determined, they are determining frequency, grain water content, electrode gap and grain layer thickness. For convenient research, the special determining device is designed that consists of the sensor of the water content of grain that has the level electrodes at the same plane and its measure system. Author conducted the theoretical researches on the electric properties of grain under non-uniform electric field by the knowledge of dielectric physics and biophysics. The equipotential lines of the electric field caused by double electric axes are 2 eccentric circle family lines that are mutual inversion. The extremum points of the polarization charge density of grain surface appear in the points of tangency that are the circle that the center of circle is at the center of electric axis and grain surface. The influence of determining frequency on electric properties of grain under non-uniform electric field is obviously different from that under uniform electric field. The relationship is not logarithmic function, whereas is inverse function. Author explains the formation cause of the relationship from microstructure by using the theory of phonon and potential barrier and the doctrine of high polymer. And the fitting on the experimental results is carried out. The coherence of fitting results is of high significance. When the determining frequency is higher, the difference of the electric properties of rice is less. The influence of the water content of grain on electric properties of grain under non-uniform electric field is not logarithmic function, whereas is 3 order multinomial. This result is that of dynamic equilibrium that polarization, water content and non-uniform electric field affect together. The results of error analysis show that the error is less than 1%. The influence of the electrode gap on the electric properties of grain is related with the factor of the water content of grain. Theoretically the thinner the electrode gap is, the higher the precision is. But according to operating characteristic and the experimental results, the electrode gap should be moderate. The influence of the grain layer thickness on the electric properties of grain mainly is contact pressure and bulk weight. There is not the difference of the contact pressure in the level electrodes because the electrodes are at the same plane. The influence of the bulk weight only appears in high water content. Therefore, when the grain layer thickness is less than 50cm, its influence on the electric properties of grain is neglectful. According to operating characteristic of pin grain drying machine, the method of on-line determination of grain water content based on non-uniform electric field has the most significant relationship between the electric properties and the water content of grain and best effect at the determining frequency of 9000Hz and the electrode gap of 16mm.
In this paper, the device of on-line determination of grain water content based on non-uniform electric field is designed, which consists of the sensor of the water content of grain which has the level electrodes at the same plane, the high frequency power supply, the standard resistance and the data processing system. By means of comparing and choosing, the best objective function is defined, that is potential difference of grain between the electrodes. The relationship between potential difference and water content of grain is 3 order multinomial. The fitting errors are less than 2.6% when the water content of grain is less than 23% and about 0.5% when the water content of grain is the safe water content. This is satisfied with the operating requirement of pin grain drying machine. Author still carries out the experiments of on-line determination of the water content of grain by the sensor of the water content of grain that has the level electrodes at the same plane and its measure system, and conducts the analysis of experimental errors. The grain breeds of 20912, Xudao 3 and Zhoumai 15 are applied in the experiments. By experiments, it is found that there is not a breed difference in the objective function of rice water content at the safe water content of grain, but the objective function of rice water content is different from that of wheat water content. This is good for the simplification of operating determining the water content of grain online in pin drying machine.
引文
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