Abstract
To study the accumulation characteristics of rice seeds with different moisture content, an accurate model of rice seeds was established by 3D scanning technology. The accumulation state of rice seeds by the “point source” accumulation method was analyzed by proportioning and measuring the simulation parameters with different moisture content. The accumulation process was simulated at 10.23%, 14.09%, 17.85%, 21.77%, 26.41% and 29.22% moisture content, respectively. The velocity and force state of the seeds were visually analyzed by using the accumulation process with a moisture content of 29.22%. The accumulation process was divided into four stages according to the velocity characteristics of the seeds. The average force and kinetic energy of the rice seeds outside the cylinder were obtained, and the average force of the rice seeds outside the cylinder was proved to be the direct cause of the velocity change during the accumulation process. The mechanical characteristics of rice seeds in the quasi-static accumulation stage were partitioned and systematically analyzed. The force distribution of the “central depression” structure of rice seeds with a moisture content of 10.23%, 14.09% and 17.85% on the horizontal surface appeared. The higher the moisture content of rice seeds, the more likely the typical “circular” force structure appeared, and the more uniformly the force on the horizontal surface was distributed in the circumference direction.
Highlights
The accumulation is one of the most common states of existence during the production, storage and processing of rice seeds
This paper studied the velocity and mechanical characteristics of rice seeds with different moisture content in the accumulation process and the mechanical characteristics of the quasi-static accumulation stage by taking the classical “point source” type as an example, showing that the accumulation characteristics of rice seeds with different moisture content were not the same, and not all rice seeds showed a significant “central depression” law in the normal force on the horizontal surface, which may be closely related to the physical characteristics of rice seeds
This study accurately established the model of rice seeds based on 3D scanning technology, simulated the accumulation state of rice seeds by “point source” accumulation method by discrete element method, and obtained the velocity, force, kinetic energy and force distribution under the accumulation state of rice seeds with different moisture content
Summary
The accumulation is one of the most common states of existence during the production, storage and processing of rice seeds. It is a highly dynamic and variable system with no viscous connection between seeds [1]. As a complex nonlinear system, the seed medium responds to various perturbations by “self-organizing” with changes in external factors, and its unevenly distributed internal chain-like mechanical structure allows it to exhibit many singularities like both solid and liquid [2]. Agricultural engineering and food engineering are the most widely used fields of grain systems. Grain accumulation is involved in the storage of materials, subsequent processing and the development of related equipment. The research on the accumulation characteristics of grain systems has important basic scientific significance and engineering application value [3]
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