基于流固耦合的油墨转移机理研究
摘 要
流固耦合的油墨转移机理研究所追求的首要诉求就是在印刷过程中，详细研究流体与固体之间的相互作用，相互关系。耦合现象是在油墨转移过程中影响油墨转移效率的一项重要因素，本文重点研究流固耦合现象对油墨转移效率的影响并试图寻求规律。分析了油墨通过压印辊和印版滚筒及在油墨压力与墨辊间压力共同作用下胶辊的变形和墨层有效厚度，得到油墨流动通道及油墨转移率。将有可能产生巨大经济效益。流固耦合力学是流体力学与固体力学交叉而生成的一门力学分支，它是研究变形固体在流场作用下的各种行为以及固体位形对流场影响这二者相互作用的一门科学。流固耦合力学的重要特征是两相介质之间的相互作用，变形固体在流体载荷作用下会产生变形或运动。通过本次课题的研究，可以更加深入的阐述油墨转移的机理，分析油墨转移存在的一些不足和缺陷，从流固耦合理论出发，研究相应的解决对策，提出建议。为行业发展提高技术能力和生产能力，实现印刷工业生产的高度自动化，提高经济效益。
关键词：流固耦合；浸入边界法；动边界法
Research on ink transfer mechanism based on fluid-structure coupling
ABSTRACT
The primary pursuit of fluid-structure coupling ink transfer machine research is the detailed study of the interaction and relationship between fluids and solids in the printing process. Coupling phenomenon is an important factor that affects the ink transfer efficiency in the process of ink transfer. This paper focuses on studying the effect of fluid-structure coupling phenomenon on the ink transfer efficiency and tries to find the law. By analyzing the deformation of the cots and the effective thickness of the ink layer under the action of the pressure between the ink rollers and the pressure between the ink rollers, the ink flow channel and the ink transfer rate are obtained. Will have the potential to generate huge economic benefits. Fluid-solid coupling mechanics is a branch of mechanics generated by the intersection of fluid mechanics and solid mechanics. It is a science to study the various behaviors of deformed solids under the action of flow field and the influence of solid configuration on the interaction between the two. The important feature of fluid-solid coupling mechanics is the interaction between two-phase medium. Deformed solid will deform or move under the action of fluid load. Through the research of this topic, we can elaborate the mechanism of ink transfer more deeply, analyze some shortcomings and defects of ink transfer, from the fluid-structure coupling theory, study the corresponding solutions, and put forward suggestions. To improve the technical ability and production capacity for the development of the industry, to achieve a high degree of automation of printing industry production, improve economic benefits.
Key words: Fluid-structure coupling；Immersed Boundary Method；Moving boundary method
- 引言
流固耦合问题的研究历史可追溯到19世纪初，人们对于流固耦合现象的早期认识源于机翼及叶片的气动弹性问题。气动弹性是研究气动力对固体的作用以及固体对流场的反作用的一门科学，核心内容就是气流激振问题。弹性体的叶片在气动力作用下形成气弹耦合的振动，当叶片在振动位移过程中，从气流中吸收的能量大于阻尼功时，振动加剧，颤振发作，也就是通常所说的失速颤振。叶片颤振涉及气动力特性和叶片固体动力特性，叶片颤振的发生与其工作状态有关。失速颤振发生时，大幅的剧烈振动会使叶片在短时间内裂断，后果极为严重。此外，流固耦合问题还在很多工程技术领域得到了研究，例如涡轮机械设计、海岸海洋工程、高层建筑工程、流体管路输送以及人体动脉流动等，而这些工程领域的共同特点就是流体载荷对弹性结构的影响十分重要。
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