功能梯度材料的低温挤压成形过程建模与实验研究

摘要/Abstract

摘要： 使用低温挤压成形方法制造功能梯度材料（FGM）过程中，膏体材料存在气泡、结块和一定程度的液相迁移现象，导致挤压成形过程难以控制。使用系统辨识的方法建立了FGM成形过程的差分模型，运用残差的方差分析方法对系统模型的阶次进行估计，运用递推最小二乘法对参数进行辨识，得到FGM成形的控制模型。设计了自适应控制器，对FGM成形过程进行实时控制。实验验证了控制模型的准确性和控制方法的有效性。

关键词: 功能梯度材料, 低温挤压成形, 系统辨识, 自适应控制

Abstract: In the making processes of the FGMs by the FEF methods, the extrusion processes were difficult to control due to the presence of bubbles, agglomeration and a certain degree of liquid phases migration in the paste materials. The differential model of the forming processes of FGM was established by using the method of system identification. The variance analysis methods were used to estimate the order of the system model. The parameters were identified by recursive least squares methods to obtain FGM molding control model. And the design of adaptive controllers were finished to achieve the FGM molding processes for real-time control. The validity of the control model and the effectiveness of the control method were verified by experiments.

Key words: functionally gradient material(FGM), freeze-form extrusion fabrication (FEF), system identification, adaptive control

中图分类号:

TH145.9

马维东；李淑娟；杨磊鹏；王馨翊；谷中豪. 功能梯度材料的低温挤压成形过程建模与实验研究[J]. 中国机械工程.

MA Weidong；LI Shujian；YANG Leipeng；WANG Xinyi；GU Zhonghao. Modeling and Experimental Study on Freeze-form Extrusion Fabrication of FGMs[J]. China Mechanical Engineering.

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