Seed TAMs

 

The Seed TAMs region of the Options form controls the creation of Seed TAMs that populate the first generation. Using each of the TAM methods denoted on the Options form, an accelerometer set is created for each FEM configuration and is put into the initial population. If multiple FEM configurations exist the Total # Accels is used for each configuration’s Seed TAM. By default all Seed TAMs will be generated, but the generation of individual Seed TAM can be suppressed by unchecking the corresponding checkbox. Seed TAMs are not required, however the GA will generally yield a better final accelerometer set when they are included in the initial population.

The Seed TAMs available are standard deterministic methods of accelerometer selection. Since the GA uses these TAMs in the initial population, as long as some percent reproduction is given the GA accelerometer set will be equal to or better than the Seed TAM accelerometer set.

If the Pick Triax Accels option is selected, then the Seed TAMs are generated by evaluating each potential location on a grid-basis as opposed to a DOF-basis. Normally, each DOF is evaluated by some error metric (depending on the type of Seed TAM) and the best DOF are retained. If the Pick Triax Accels box is checked the error metric for each DOF is combined on a grid-by-grid basis, then the best grids are selected for each Seed TAM.

A user-defined Seed TAM can also be included in the initial generation by clicking the User-Defined button and selecting or importing the desired set. If multiple FEM configurations are used then this DOF set should be the union of all desired DOF.