2.3.3 Selection of drive size
To use the size drive to simulate combustion under Pro/ENGINEER, be sure to choose the correct shift size, otherwise the graphics will not move according to the expected parallel shift. The easiest way to select the drive size is to give the Select Drive Size menu. When the user presses the menu, the graphic size is displayed and the user selects it. Although this method is simple, the size of the complicated charge pattern is very large, and it is difficult for the user to determine which size to select as the drive size. If you can take advantage of the program's default drive size, it will greatly simplify the use of the program. Careful study of the pattern of the column, the characteristics of the burning surface of the column, the size of all the arcs (including the circle) in the parallel movement will change with the change, so you can customize all the arc size to the driving size of the burning surface, which The drive size selected by the user will be greatly reduced, and even if the dimension is properly selected, the calculation can be performed without selecting the drive size. Figures 7 and 8 illustrate the effect of dimensioning on drive size. In Figure 7, to achieve parallel shifts, the dimensions d1, d2, and r1 must be changed simultaneously. In Fig. 8, the dimension is changed. Since the position of the center does not change in the parallel shift, the vertical edge and the horizontal edge are tangentially constrained by the arc, and only the arc size r1 is changed to realize the parallel shift. Fig. 9 is a feature quantity calculation menu, Fig. 10 is a feature quantity calculation window, Fig. 11 is a medicine column in the burning surface transition, and Figs. 12 and 13 are final calculation results and a burning surface-meat thickness curve, respectively.
Figure 7 General dimensions under Pro/ENGINEER
Figure 8 modified dimensioning
Figure 9 Feature Quantity Calculation Submenu
Figure 10 feature quantity calculation window
(a) w=150mm
(b) w=250mm
Figure 11 The fuel column in the burning surface
Figure 12 Characteristic quantity calculation results
Figure 13 Burning surface - meat thickness curve
2.4 Internal ballistic calculation
The internal ballistic calculation is another main module of the program. Using the above calculation results of the burning surface, the internal ballistic results and the internal ballistic curve can be obtained through the internal ballistic calculation program.
3 Conclusion
This paper introduces the solid rocket motor charge CAD software developed by the secondary development technology of Pro/ENGINEER 2001. "Standing on the shoulders of giants, why should they rise from the ground?" Although the software is small, it has taken advantage of the powerful features of Pro/ENGINEER 2001 to achieve relatively powerful functions. The software has been applied to the design work of our institute. The actual use shows that the software is friendly, easy to use, high in calculation results, and provides a link between engineering drawing and design calculation, greatly improving the designer. Work efficiency.
references
1 Kris Jamsa [US] and so on. C/C++ programmer practical Daquan. 1st edition. Beijing: Mechanical Industry Press, 2000
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