Research on personalized external fixator design based on parametric 3D printing

doi:10.11996/JG.j.2095-302X.2023051050

Abstract

Abstract:

By employing the parametric mathematical logic features, this study explored a rapid design method for personalized 3D-printed external fixator morphology. Through the analysis of design elements of 3D-printed external fixator morphology, three morphological design element variables were summarized and converted into parameter variables. The logical relationship was constructed between the parameter variables to obtain a personalized 3D-printed external fixator design program. Secondly, finite element strength analysis and program efficiency tests were conducted on multiple schemes generated by the parametric program. The results of the program efficiency test indicated that this program could quickly generate personalized 3D-printed external fixators and efficiently optimize the personalized morphology of the 3D-printed external fixator. According to the finite element analysis results, all the multiple 3D-printed external fixator schemes generated by this program met the requirements of mechanical strength. The modeling program written through parameterization enabled the morphological design of personalized 3D-printed external fixators. It simplified the design process of 3D-printed external fixators, allowing for rapid optimization of morphological design and improving design efficiency.

Key words: parametric design, external fixation brace, personalized design, Grasshopper, 3D printing

CLC Number:

TB472

BAI Yu, WANG Kun. Research on personalized external fixator design based on parametric 3D printing[J]. Journal of Graphics, 2023, 44(5): 1050-1056.

Figures/Tables 14

Fig. 1 Research method of 3D printing external fixation brace

Table 1 Two-dimensional plan view of ventilation hole morphology

参数	透气孔基本单元图形a					透气孔的分布变化b		透气孔的数量c
	几何图形a1			个性化图形a2		规则b1	无规则b2	稀疏c1	适中c2	紧密c3
	六边形	三角形	…	心形	…	规则b1	无规则b2	镂空占比小于50%	镂空占比 50%~70%	镂空占比大于70%
二维平面			…		…

Fig. 2 Data acquisition

Fig. 3 Parametric program logic flow chart

Fig. 4 Model refactoring program

Fig. 5 Benchmark point distribution numbering

Table 2 Results of morphological distribution changes

函数关系式	y=kx (k为常数)	y=sinx	贝塞尔曲线
函数曲线
形态变化

Fig. 6 Morphological design program

Fig. 7 Cluster program

Fig. 8 Scheme

Fig. 9 Displacement Results of four schemes

Fig. 10 Stress results of four schemes

Table 3 Strength analysis results of hollowing out Scheme

方案	位移峰值(mm)	应力峰值(MPa)
菱形	0.011 8	0.402 7
三角形	0.012 1	0.448 4
心形	0.012 3	0.832 9
圆形	0.014 6	0.975 8

Table 4 Modeling Efficiency Test (s)

方案	程序建模耗时	传统建模耗时
菱形	23	7 100
三角形	19	7 200
心形	16	7 260
圆形	20	7 050

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