Pneumatic Feeding System for Low-temperature Deposition Manufacturing Based on System Identification
Low-temperature deposition manufacturing (LDM),which is based on the principle of additive manufacturing,has a big advantage over other methods.Specifically,it can preserve the biological activity and other useful properties of bio-materials in the field of bone scaffold fabrication.During the formation of bone scaffolds,stable feeding velocity can be regulated by air pressure.Throughout the process,feeding has a direct impact on the resulting scaffold.Under optimal velocity conditions,an appropriate extrusion velocity is key to the fabrication of perfect macro pore structures,which prevents collapse between layers and over-accumulation.This paper mainly focuses on combinations of mathematical models of the first order and delay and least squares identification and describes the construction of a model of pressure and extrusion velocity by analyzing the process of pneumatic material feeding.The results,confirmed the time series of adjusting the desired pressure by opening and closing the valves to change the velocity of feeding and guarantee the stability and speed of scaffold formation.Experiments verifies that over-accumulation and less-lap caused by feeding pressure had been solved to some extent by adjusting air inflation and exhaust valves based on the time series,reducing the delay in the response and the quality of over-accumulation very effectively.Conclusion shows the effective control of feeding velocity has great significance for improving the technical level of the bionic bone scaffold fabrication process and fulfilling the automation of bone scaffold molding equipment.
Bone scaffold LDM pneumatic feeding system identification
LIU Yuanyuan FANG Shuhui HAN Zhenzhong LIU Ying YU Yongze HU Qingxi
Rapid Manufacturing Engineering Center, Shanghai University. Baoshan, Shanghai, 200444, China
国内会议
第154场中国工程科技论坛——2012年增材制造技术国际论坛暨第六届全国增材制造技术学术会议
武汉
英文
1-5
2012-12-01（万方平台首次上网日期，不代表论文的发表时间）