баннер

K3-Tent is oriented to structural design of tensile structures of arbitrary complexity and to development of architectonic and manufacturing documentation.

The technology of tent structures design in K3-Tent CAD/CAM consists of three stages:

  1. Tent surface form finding
  2. Subdividing the surface into patches
  3. Unfolding double-curved and other patches onto the plane
Creating the Frame object
Tent form finding
Cut out the surface
Patterning

Form Finding

Tent structure model is based on the special Frame object included into the system. Frame object is a set of spatial edges connected with each other. Edges can be represented by segments of straight lines or arcs of circle. Frame object is a basis for the tent cloth. Frame edges and nodes should correspond to the tent cloth constrains. Closed topological triangles or rectangles of the Frame are automatically accepted by the system as cloth preliminary patches. One should keep in mind that topological triangles or rectangles where there are no cloth patches should not be incorporated with Frame object. The Frame object creation is an engineering problem that should be solved by a Designer interactively. The system detects cloth surface in the form of triangle grid automatically thus the Frame-Grid object is prepared to further operation. The implemented algorithm based on the Stretched Grid Method automatically provides optimal surface form finding to avoid any folders, beads or plaiting etc.

K3-Tent. Tent structure design stages

Cut out the surface

Cutting out the cloth surface is the basic and most important stage of tensile structures design. The cut out should be implied as a process of the cloth surface subdivision into separate patches and further unfolding them onto a plane to prepare a pattern. The problem is that each piece is a part of a double-curved surface that cannot be unfolded precisely in general case. For this reason of unfolding the patches is actually the plane mapping, which can be done only approximately. The less Gaussian curvature of the surface is the higher the accuracy of the plane mapping is. As a rule, the plane mapping allows to obtain a pattern with linear dimensions 1-2% less than corresponding spatial lines of a final surface. That is why it is necessary to provide the appropriate margins while patterning. The designer traces the mark and cutting lines (prospective seams) on the modeled 3D tent surface. Several various algorithms of tracing lines on the cloth surface are implemented in this version of the system including the algorithm of tracing the shortest line between two arbitrary points.

K3-Tent. Tent structure design stages

Patterning

K3-Tent system allows a Designer to obtain pattern of cloth patches automatically. To do this one should specify a patch, or select all cloth patches.

K3-Tent. Obtaining the sample. Patterning