Method of Analysis
2D analysis implies here the calculation of PSP results based upon pixel-oriented image data and using solely image processing methods. The image data are created during a test by using industry-standard cameras. The result is also an image where the color or intensity value associated with a pixel corresponds to a pressure value.
In the 3D analysis the data values of all acquired images are mapped onto a 3D grid (see bottom figure), whereupon the analysis is then carried out on the node points of this grid. This method, although placing high demands on the processing software, provides the following advantages compared with the original 2D software:
With the aid of the 3D part of ToPas, it is also possible to carry out geometrical manipulations (such as sectioning, coalescing, changing the surface normals, etc.). Furthermore, forces and moments can be calculated from the pressure distribution.
ToPas is implemented as client-server software. The server waits after start for commands from the client. A windows-based client for the interactive processing was created (see figure in the middle); it takes over the task of of creating the corresponding commands for the server. For the case where automated data processing is advantageous, scripted routines can be written. By using these scripts, a high degree of automation can be achieved, so that, for example, complete 360° results can be calculated in less than a minute.
ToPas runs under Linux and Solaris environments.