Geometric constraint calculation technology suitable for free deformation parameterization
A parametric, geometric technique used in the field of geometric constraint computing technology
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Embodiment 1
[0088] The invention discloses a space point O p along the set direction The calculation method of the intersection point intersecting with the geometric shape surface, said geometric shape surface is the overall shape surface or partial shape surface of an aerospace vehicle, or a ship, or an automobile. In this embodiment, the method is illustrated by taking the optimal design of the wing of the wing-body fusion underwater glider as an example, and the process is as follows figure 1 shown, including the following steps:
[0089] S11. Carrying out triangular meshing on the surface of the initial geometric shape, and converting it into a discrete surface composed of a plurality of triangular planes;
[0090] Transform the initial geometric shape described by different surface modeling methods into discrete surfaces described by triangular meshes, such as figure 2 Shown is the triangular discrete surface of the initial shape of the wing-body fusion underwater glider. The s...
Embodiment 2
[0143] This embodiment provides a thickness constraint calculation method suitable for free deformation parameterization. The thickness constraint mainly meets the installation size requirements of the equipment mechanism, etc. Taking the wing-body fusion underwater glider as an example, Figure 7 A schematic diagram of the thickness constraint in the FFD control volume is given. In the figure, the dots are the intersection points of the thickness constraint and the upper and lower surfaces, and the length of the line segment between the dots is the size of the thickness constraint. The key to thickness constraint calculation is to calculate accurately after the deformation of FFD control body Figure 7 The location of the dot. Such as Figure 8 As shown, the specific calculation includes the following steps:
[0144] S21. Determine the starting point and direction of the thickness constraint in the geometric shape surface;
[0145] S22. Dividing the geometric shape surface...
Embodiment 3
[0157] This embodiment discloses a volume constraint calculation method suitable for free deformation parameterization. The volume constraint requires that the specified space meet certain volume requirements, such as meeting the space requirements required by battery mechanisms and the like. Taking wing-body fusion underwater glider as an example, Figure 10 is a schematic diagram of the volume constraint in the FFD control volume, Figure 10 The volume of the small and medium grid part needs to meet certain requirements, and the specific mathematical expression can be described as V≥V th , where V is the volume of the small grid part, V th Volume threshold required for volume constraints. The key to the volume constraint calculation is to accurately calculate the volume size of the small mesh part after the deformation of the FFD control volume. Such as Figure 11 shown, including the following steps:
[0158] S31. Determine the boundary curve and direction of the volum...
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