面向三维打印的压电式喷头的驱动与控制

发布时间：2018-05-27 16:21

本文选题：三维打印 + 压电喷头　；参考：《西安电子科技大学》2012年硕士论文

【摘要】：三维打印技术是目前最具有生命力的快速成型技术之一，适用于机械工程、电子工程、生物医学领域的新产品开发。作为一种经济型快速成型技术，它具有成本低系统可靠性高设备体积小噪声小成型速度快等优点，且产品材料和颜色可多样化，具有巨大的应用潜能和广阔的市场前景。本文针对制约三维打印技术发展的高粘度、高密度液体喷射成形问题，研究了其喷射驱动的关键技术。首先，研究了微压电打印头的工作原理及驱动时序，给出了一种基于FPGA的喷头控制方法。其次，提出了一种自适应喷射驱动控制方法，通过压电单元测出流道中的压力变化，计算相应的压力波周期，并据此调整驱动脉宽，实现不同密度液体的喷射；在此基础上，通过预估液滴的喷射速度并引入反馈控制策略调整驱动脉冲的幅值，，从而达到预计的喷射速度，实现高粘度，高密度液体的喷射。CFD仿真结果表明此方法的有效性。最后，设计了三维细胞打印的实验装置，并通过细胞打印实验分析了影响细胞打印的几个因素。
[Abstract]:Three dimensional printing technology is one of the most dynamic rapid prototyping technologies, which is suitable for the development of new products in the fields of mechanical engineering, electronic engineering and biomedicine. As an economical rapid prototyping technology, it has low cost. High system reliability? Small size? Low noise? It has many advantages, such as fast forming speed and diversified materials and colors. It has great application potential and broad market prospect. In order to solve the problem of high viscosity and high density liquid jet forming which restricts the development of 3D printing technology, the key technology of jet drive is studied in this paper. Firstly, the working principle and driving timing of micro piezoelectric printer are studied, and a control method of nozzle based on FPGA is presented. Secondly, an adaptive jet drive control method is proposed. The pressure change in the channel is measured by piezoelectric element, the corresponding pressure wave period is calculated, and the driving pulse width is adjusted accordingly to realize the liquid jet of different density. By predicting the spray velocity of the droplet and introducing the feedback control strategy to adjust the amplitude of the driving pulse, the predicted injection velocity is achieved, and the simulation results of high viscosity and high density liquid injection. CFD show the effectiveness of this method. Finally, an experimental device for three dimensional cell printing is designed, and several factors affecting cell printing are analyzed through cell printing experiments.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP334.8

【引证文献】