论文标题
高精度滴定喷墨印刷的驱动波形的多目标优化
Multi-objective optimization of actuation waveform for high-precision drop-on-demand inkjet printing
论文作者
论文摘要
点播（DOD）喷墨印刷被认为是制造高级功能材料的有前途的技术之一。对于DOD打印机，长期用于实现无卫星较小液滴的高精度分配技术，长期以来一直在模仿薄膜结构。本研究将分配喷嘴上游的液体室的入口速度视为控制变量，并旨在使用样品效率高的贝叶斯优化算法优化其波形。首先，液滴分配动力学是通过使用开源OpenFOAM求解器，InterFOAM进行数值复制的，并且结果将传递给基于Pyfoam的另一个代码。然后，表征驱动DOD打印机的动态波形的参数由贝叶斯优化（BO）算法确定，以最大程度地提高规定的多目标函数，该函数表示为两个因素的总和，即主液滴的大小和卫星液滴的存在。结果表明，当前的BO算法可以在150个模拟中成功找到高精度分配波形。具体而言，可以有效消除卫星液滴，并通过施加最佳波形，可以将液滴直径显着降低至喷嘴直径的24.9％。
Drop-on-demand (DOD) inkjet printing has been considered as one of promising technologies for the fabrication of advanced functional materials. For a DOD printer, high-precision dispensing techniques for achieving satellite-free smaller droplets, have long been desired for patterning thin-film structures. The present study considers the inlet velocity of a liquid chamber located upstream of a dispensing nozzle as a control variable and aims to optimize its waveform using a sample-efficient Bayesian optimization algorithm. Firstly, the droplet dispensing dynamics are numerically reproduced by using an open-source OpenFOAM solver, interFoam, and the results are passed on to another code based on pyFoam. Then, the parameters characterizing the actuation waveform driving a DOD printer are determined by the Bayesian optimization (BO) algorithm so as to maximize a prescribed multi-objective function expressed as the sum of two factors, i.e., the size of a primary droplet and the presence of satellite droplets. The results show that the present BO algorithm can successfully find high-precision dispensing waveforms within 150 simulations. Specifically, satellite droplets can be effectively eliminated and the droplet diameter can be significantly reduced to 24.9% of the nozzle diameter by applying the optimal waveform.
